DOKK / manpages / debian 12 / slurm-client / slurm.conf.5.en
slurm.conf(5) Slurm Configuration File slurm.conf(5)

slurm.conf - Slurm configuration file

slurm.conf is an ASCII file which describes general Slurm configuration information, the nodes to be managed, information about how those nodes are grouped into partitions, and various scheduling parameters associated with those partitions. This file should be consistent across all nodes in the cluster.

The file location can be modified at execution time by setting the SLURM_CONF environment variable. The Slurm daemons also allow you to override both the built-in and environment-provided location using the "-f" option on the command line.

The contents of the file are case insensitive except for the names of nodes and partitions. Any text following a "#" in the configuration file is treated as a comment through the end of that line. Changes to the configuration file take effect upon restart of Slurm daemons, daemon receipt of the SIGHUP signal, or execution of the command "scontrol reconfigure" unless otherwise noted.

If a line begins with the word "Include" followed by whitespace and then a file name, that file will be included inline with the current configuration file. For large or complex systems, multiple configuration files may prove easier to manage and enable reuse of some files (See INCLUDE MODIFIERS for more details).

Note on file permissions:

The slurm.conf file must be readable by all users of Slurm, since it is used by many of the Slurm commands. Other files that are defined in the slurm.conf file, such as log files and job accounting files, may need to be created/owned by the user "SlurmUser" to be successfully accessed. Use the "chown" and "chmod" commands to set the ownership and permissions appropriately. See the section FILE AND DIRECTORY PERMISSIONS for information about the various files and directories used by Slurm.

The overall configuration parameters available include:

The name of the backup machine hosting the accounting storage database. If used with the accounting_storage/slurmdbd plugin, this is where the backup slurmdbd would be running. Only used with systems using SlurmDBD, ignored otherwise.

This controls what level of association-based enforcement to impose on job submissions. Valid options are any combination of associations, limits, nojobs, nosteps, qos, safe, and wckeys, or all for all things (except nojobs and nosteps, which must be requested as well).

If limits, qos, or wckeys are set, associations will automatically be set.

If wckeys is set, TrackWCKey will automatically be set.

If safe is set, limits and associations will automatically be set.

If nojobs is set, nosteps will automatically be set.

By setting associations, no new job is allowed to run unless a corresponding association exists in the system. If limits are enforced, users can be limited by association to whatever job size or run time limits are defined.

If nojobs is set, Slurm will not account for any jobs or steps on the system. Likewise, if nosteps is set, Slurm will not account for any steps that have run.

If safe is enforced, a job will only be launched against an association or qos that has a GrpTRESMins limit set, if the job will be able to run to completion. Without this option set, jobs will be launched as long as their usage hasn't reached the cpu-minutes limit. This can lead to jobs being launched but then killed when the limit is reached.

With qos and/or wckeys enforced jobs will not be scheduled unless a valid qos and/or workload characterization key is specified.

A restart of slurmctld is required for changes to this parameter to take effect.

A comma-separated list of external slurmdbds (<host/ip>[:port][,...]) to register with. If no port is given, the AccountingStoragePort will be used.

This allows clusters registered with the external slurmdbd to communicate with each other using the --cluster/-M client command options.

The cluster will add itself to the external slurmdbd if it doesn't exist. If a non-external cluster already exists on the external slurmdbd, the slurmctld will ignore registering to the external slurmdbd.

The name of the machine hosting the accounting storage database. Only used with systems using SlurmDBD, ignored otherwise.

Comma-separated list of key-value pair parameters. Currently supported values include options to establish a secure connection to the database:
The path name of the client public key certificate file.

The path name of the Certificate Authority (CA) certificate file.

The path name of the directory that contains trusted SSL CA certificate files.

The path name of the client private key file.

The list of permissible ciphers for SSL encryption.

The password used to gain access to the database to store the accounting data. Only used for database type storage plugins, ignored otherwise. In the case of Slurm DBD (Database Daemon) with MUNGE authentication this can be configured to use a MUNGE daemon specifically configured to provide authentication between clusters while the default MUNGE daemon provides authentication within a cluster. In that case, AccountingStoragePass should specify the named port to be used for communications with the alternate MUNGE daemon (e.g. "/var/run/munge/global.socket.2"). The default value is NULL.

The listening port of the accounting storage database server. Only used for database type storage plugins, ignored otherwise. The default value is SLURMDBD_PORT as established at system build time. If no value is explicitly specified, it will be set to 6819. This value must be equal to the DbdPort parameter in the slurmdbd.conf file.

Comma-separated list of resources you wish to track on the cluster. These are the resources requested by the sbatch/srun job when it is submitted. Currently this consists of any GRES, BB (burst buffer) or license along with CPU, Memory, Node, Energy, FS/[Disk|Lustre], IC/OFED, Pages, and VMem. By default Billing, CPU, Energy, Memory, Node, FS/Disk, Pages and VMem are tracked. These default TRES cannot be disabled, but only appended to. AccountingStorageTRES=gres/craynetwork,license/iop1 will track billing, cpu, energy, memory, nodes, fs/disk, pages and vmem along with a gres called craynetwork as well as a license called iop1. Whenever these resources are used on the cluster they are recorded. The TRES are automatically set up in the database on the start of the slurmctld.

If multiple GRES of different types are tracked (e.g. GPUs of different types), then job requests with matching type specifications will be recorded. Given a configuration of "AccountingStorageTRES=gres/gpu,gres/gpu:tesla,gres/gpu:volta" Then "gres/gpu:tesla" and "gres/gpu:volta" will track only jobs that explicitly request those two GPU types, while "gres/gpu" will track allocated GPUs of any type ("tesla", "volta" or any other GPU type).

Given a configuration of "AccountingStorageTRES=gres/gpu:tesla,gres/gpu:volta" Then "gres/gpu:tesla" and "gres/gpu:volta" will track jobs that explicitly request those GPU types. If a job requests GPUs, but does not explicitly specify the GPU type, then its resource allocation will be accounted for as either "gres/gpu:tesla" or "gres/gpu:volta", although the accounting may not match the actual GPU type allocated to the job and the GPUs allocated to the job could be heterogeneous. In an environment containing various GPU types, use of a job_submit plugin may be desired in order to force jobs to explicitly specify some GPU type.

The accounting storage mechanism type. Acceptable values at present include "accounting_storage/none" and "accounting_storage/slurmdbd". The "accounting_storage/slurmdbd" value indicates that accounting records will be written to the Slurm DBD, which manages an underlying MySQL database. See "man slurmdbd" for more information. The default value is "accounting_storage/none" and indicates that account records are not maintained.

The user account for accessing the accounting storage database. Only used for database type storage plugins, ignored otherwise.

Comma separated list used to tell the slurmctld to store extra fields that may be more heavy weight than the normal job information.

Include the job's comment field in the job complete message sent to the Accounting Storage database. Note the AdminComment and SystemComment are always recorded in the database.

Include a batch job's environment variables used at job submission in the job start message sent to the Accounting Storage database.

Include the job's batch script in the job start message sent to the Accounting Storage database.

The AcctGather plugins sampling interval for node accounting. For AcctGather plugin values of none, this parameter is ignored. For all other values this parameter is the number of seconds between node accounting samples. For the acct_gather_energy/rapl plugin, set a value less than 300 because the counters may overflow beyond this rate. The default value is zero. This value disables accounting sampling for nodes. Note: The accounting sampling interval for jobs is determined by the value of JobAcctGatherFrequency.

Identifies the plugin to be used for energy consumption accounting. The jobacct_gather plugin and slurmd daemon call this plugin to collect energy consumption data for jobs and nodes. The collection of energy consumption data takes place on the node level, hence only in case of exclusive job allocation the energy consumption measurements will reflect the job's real consumption. In case of node sharing between jobs the reported consumed energy per job (through sstat or sacct) will not reflect the real energy consumed by the jobs.

Configurable values at present are:

No energy consumption data is collected.

Energy consumption data is collected from the Baseboard Management Controller (BMC) using the Intelligent Platform Management Interface (IPMI).

Energy consumption data is collected from the Baseboard Management Controller (BMC) for HPE Cray systems.

Energy consumption data is collected from hardware sensors using the Running Average Power Limit (RAPL) mechanism. Note that enabling RAPL may require the execution of the command "sudo modprobe msr".

Energy consumption data is collected from the Lenovo SD650 XClarity Controller (XCC) using IPMI OEM raw commands.

Identifies the plugin to be used for interconnect network traffic accounting. The jobacct_gather plugin and slurmd daemon call this plugin to collect network traffic data for jobs and nodes. The collection of network traffic data takes place on the node level, hence only in case of exclusive job allocation the collected values will reflect the job's real traffic. In case of node sharing between jobs the reported network traffic per job (through sstat or sacct) will not reflect the real network traffic by the jobs.

Configurable values at present are:

No infiniband network data are collected.

Infiniband network traffic data are collected from the hardware monitoring counters of Infiniband devices through the OFED library. In order to account for per job network traffic, add the "ic/ofed" TRES to AccountingStorageTRES.

Network traffic statistics are collected from the Linux sysfs pseudo-filesystem for specific interfaces defined in acct_gather_interconnect.conf(5). In order to account for per job network traffic, add the "ic/sysfs" TRES to AccountingStorageTRES.

Identifies the plugin to be used for filesystem traffic accounting. The jobacct_gather plugin and slurmd daemon call this plugin to collect filesystem traffic data for jobs and nodes. The collection of filesystem traffic data takes place on the node level, hence only in case of exclusive job allocation the collected values will reflect the job's real traffic. In case of node sharing between jobs the reported filesystem traffic per job (through sstat or sacct) will not reflect the real filesystem traffic by the jobs.

Configurable values at present are:

No filesystem data are collected.

Lustre filesystem traffic data are collected from the counters found in /proc/fs/lustre/. In order to account for per job lustre traffic, add the "fs/lustre" TRES to AccountingStorageTRES.

Identifies the plugin to be used for detailed job profiling. The jobacct_gather plugin and slurmd daemon call this plugin to collect detailed data such as I/O counts, memory usage, or energy consumption for jobs and nodes. There are interfaces in this plugin to collect data as step start and completion, task start and completion, and at the account gather frequency. The data collected at the node level is related to jobs only in case of exclusive job allocation.

Configurable values at present are:

No profile data is collected.

This enables the HDF5 plugin. The directory where the profile files are stored and which values are collected are configured in the acct_gather.conf file.

This enables the influxdb plugin. The influxdb instance host, port, database, retention policy and which values are collected are configured in the acct_gather.conf file.

If set to "YES", Slurm allows individual jobs to override node's configured CoreSpecCount value. For a job to take advantage of this feature, a command line option of --core-spec must be specified. The default value for this option is "YES" for Cray systems and "NO" for other system types.

Comma-separated list of alternative authentication plugins that the slurmctld will permit for communication. Acceptable values at present include auth/jwt.

NOTE: auth/jwt requires a jwt_hs256.key to be populated in the StateSaveLocation directory for slurmctld only. The jwt_hs256.key should only be visible to the SlurmUser and root. It is not suggested to place the jwt_hs256.key on any nodes but the controller running slurmctld. auth/jwt can be activated by the presence of the SLURM_JWT environment variable. When activated, it will override the default AuthType.

Used to define alternative authentication plugins options. Multiple options may be comma separated.
Disable "scontrol token" use by non-SlurmUser accounts.
Set max lifespan (in seconds) for any token generated for user accounts. (This limit does not apply to SlurmUser.)

Absolute path to JWKS file. Only RS256 keys are supported, although other key types may be listed in the file. If set, no HS256 key will be loaded by default (and token generation is disabled), although the jwt_key setting may be used to explicitly re-enable HS256 key use (and token generation).

Absolute path to JWT key file. Key must be HS256, and should only be accessible by SlurmUser. If not set, the default key file is jwt_hs256.key in StateSaveLocation.

Additional information to be used for authentication of communications between the Slurm daemons (slurmctld and slurmd) and the Slurm clients. The interpretation of this option is specific to the configured AuthType. Multiple options may be specified in a comma-delimited list. If not specified, the default authentication information will be used.
Default job step credential lifetime, in seconds (e.g. "cred_expire=1200"). It must be sufficiently long enough to load user environment, run prolog, deal with the slurmd getting paged out of memory, etc. This also controls how long a requeued job must wait before starting again. The default value is 120 seconds.

Path name to a MUNGE daemon socket to use (e.g. "socket=/var/run/munge/munge.socket.2"). The default value is "/var/run/munge/munge.socket.2". Used by auth/munge and cred/munge.

Credential lifetime, in seconds (e.g. "ttl=300"). The default value is dependent upon the MUNGE installation, but is typically 300 seconds.

The authentication method for communications between Slurm components. Acceptable values at present include "auth/munge", which is the default. "auth/munge" indicates that MUNGE is to be used. (See "https://dun.github.io/munge/" for more information). All Slurm daemons and commands must be terminated prior to changing the value of AuthType and later restarted.

Deprecated option, see SlurmctldHost.

Deprecated option, see SlurmctldHost.

The backup controller recovers state information from the StateSaveLocation directory, which must be readable and writable from both the primary and backup controllers. While not essential, it is recommended that you specify a backup controller. See the RELOCATING CONTROLLERS section if you change this.

The maximum time (in seconds) that a batch job is permitted for launching before being considered missing and releasing the allocation. The default value is 10 (seconds). Larger values may be required if more time is required to execute the Prolog, load user environment variables, or if the slurmd daemon gets paged from memory.
Note: The test for a job being successfully launched is only performed when the Slurm daemon on the compute node registers state with the slurmctld daemon on the head node, which happens fairly rarely. Therefore a job will not necessarily be terminated if its start time exceeds BatchStartTimeout. This configuration parameter is also applied to launch tasks and avoid aborting srun commands due to long running Prolog scripts.

Comma-separated list of absolute directory paths to be excluded when autodetecting and broadcasting executable shared object dependencies through sbcast or srun --bcast. The keyword "none" can be used to indicate that no directory paths should be excluded. The default value is "/lib,/usr/lib,/lib64,/usr/lib64". This option can be overridden by sbcast --exclude and srun --bcast-exclude.

Controls sbcast and srun --bcast behavior. Multiple options can be specified in a comma separated list. Supported values include:
Destination directory for file being broadcast to allocated compute nodes. Default value is current working directory, or --chdir for srun if set.

Specify default file compression library to be used. Supported values are "lz4" and "none". The default value with the sbcast --compress option is "lz4" and "none" otherwise. Some compression libraries may be unavailable on some systems.

If set, attempt to autodetect and broadcast the executable's shared object dependencies to allocated compute nodes. The files are placed in a directory alongside the executable. For srun only, the LD_LIBRARY_PATH is automatically updated to include this cache directory as well. This can be overridden with either sbcast or srun --send-libs option. By default this is disabled.

The plugin used to manage burst buffers. Acceptable values at present are:
Use Cray DataWarp API to provide burst buffer functionality.

This plugin provides hooks to an API that is defined by a Lua script. This plugin was developed to provide system administrators with a way to do any task (not only file staging) at different points in a job’s life cycle.

A comma-delimited list of command line interface option filter/modification plugins. The specified plugins will be executed in the order listed. No cli_filter plugins are used by default. Acceptable values at present are:
This plugin allows you to write your own implementation of a cli_filter using lua.

This plugin enables logging of job submission activities performed. All the salloc/sbatch/srun options are logged to syslog together with environment variables in JSON format. If the plugin is not the last one in the list it may log values different than what was actually sent to slurmctld.

This plugin looks for the file $HOME/.slurm/defaults and reads every line of it as a key=value pair, where key is any of the job submission options available to salloc/sbatch/srun and value is a default value defined by the user. For instance: 
time=1:30
mem=2048
The above will result in a user defined default for each of their jobs of "-t 1:30" and "--mem=2048".

The name by which this Slurm managed cluster is known in the accounting database. This is needed distinguish accounting records when multiple clusters report to the same database. Because of limitations in some databases, any upper case letters in the name will be silently mapped to lower case. In order to avoid confusion, it is recommended that the name be lower case. The cluster name must be 40 characters or less in order to comply with the limit on the maximum length for table names in MySQL/MariaDB.

Comma-separated options identifying communication options.
Require all Slurm authentication tokens to include a newer (20.11.9 and 21.08.8) payload that provides an additional layer of security against credential replay attacks. This option should only be enabled once all Slurm daemons have been upgraded to 20.11.9/21.08.8 or newer, and all jobs that were started before the upgrade have been completed.
Used specifically on a Cray using an Aries Ghal interconnect. This will check to see if the system is quiescing when sending a message, and if so, we wait until it is done before sending.

Disable IPv4 only operation for all slurm daemons (except slurmdbd). This should also be set in your slurmdbd.conf file.

Enable using IPv6 addresses for all slurm daemons (except slurmdbd). When using both IPv4 and IPv6, address family preferences will be based on your /etc/gai.conf file. This should also be set in your slurmdbd.conf file.

Specifies the interval between keepalive probes on the socket communications between srun and its slurmstepd process.

Specifies the number of keepalive probes sent on the socket communications between srun command and its slurmstepd process before the connection is considered broken.

Specifies how long sockets communications used between the srun command and its slurmstepd process are kept alive after disconnect. Longer values can be used to improve reliability of communications in the event of network failures.

By default, Slurm will cache a node's network address after successfully establishing the node's network address. This option disables the cache and Slurm will look up the node's network address each time a connection is made. This is useful, for example, in a cloud environment where the node addresses come and go out of DNS.

Used to directly bind to the address of what the node resolves to running the slurmctld instead of binding messages to any address on the node, which is the default.

Used to directly bind to the address of what the node resolves to instead of binding messages to any address on the node which is the default. This option is for all daemons/clients except for the slurmctld.

The time to wait, in seconds, when any job is in the COMPLETING state before any additional jobs are scheduled. This is to attempt to keep jobs on nodes that were recently in use, with the goal of preventing fragmentation. If set to zero, pending jobs will be started as soon as possible. Since a COMPLETING job's resources are released for use by other jobs as soon as the Epilog completes on each individual node, this can result in very fragmented resource allocations. To provide jobs with the minimum response time, a value of zero is recommended (no waiting). To minimize fragmentation of resources, a value equal to KillWait plus two is recommended. In that case, setting KillWait to a small value may be beneficial. The default value of CompleteWait is zero seconds. The value may not exceed 65533.

NOTE: Setting reduce_completing_frag affects the behavior of CompleteWait.

Deprecated option, see SlurmctldHost.

Deprecated option, see SlurmctldHost.

Identifies the plugins to be used for enforcement of core specialization. A restart of the slurmd daemons is required for changes to this parameter to take effect. Acceptable values at present include:
used only for Cray systems

used for all other system types

Default CPU frequency value or frequency governor to use when running a job step if it has not been explicitly set with the --cpu-freq option. Acceptable values at present include a numeric value (frequency in kilohertz) or one of the following governors:
attempts to use the Conservative CPU governor

attempts to use the OnDemand CPU governor

attempts to use the Performance CPU governor

attempts to use the PowerSave CPU governor
There is no default value. If unset, no attempt to set the governor is made if the --cpu-freq option has not been set.

List of CPU frequency governors allowed to be set with the salloc, sbatch, or srun option --cpu-freq. Acceptable values at present include:
attempts to use the Conservative CPU governor

attempts to use the OnDemand CPU governor (a default value)

attempts to use the Performance CPU governor (a default value)

attempts to use the PowerSave CPU governor

attempts to use the SchedUtil CPU governor

attempts to use the UserSpace CPU governor (a default value)
The default is OnDemand, Performance and UserSpace.

The cryptographic signature tool to be used in the creation of job step credentials. A restart of slurmctld is required for changes to this parameter to take effect. The default (and recommended) value is "cred/munge".

Defines specific subsystems which should provide more detailed event logging. Multiple subsystems can be specified with comma separators. Most DebugFlags will result in verbose-level logging for the identified subsystems, and could impact performance.

NOTE: You can also set debug flags by having the SLURM_DEBUG_FLAGS environment variable defined with the desired flags when the process (client command, daemon, etc.) is started. The environment variable takes precedence over the setting in the slurm.conf.

Valid subsystems available include:

Accrue counters accounting details

RPC agents (outgoing RPCs from Slurm daemons)

Backfill scheduler details

Backfill scheduler to log a very verbose map of reserved resources through time. Combine with Backfill for a verbose and complete view of the backfill scheduler's work.

Burst Buffer plugin

Cgroup details

CPU binding details for jobs and steps

Cpu frequency details for jobs and steps using the --cpu-freq option.

Generic data structure details.

Job dependency debug info

Elasticsearch debug info

AcctGatherEnergy debug info

External Sensors debug info

Federation scheduling debug info

Front end node details

Generic resource details

Heterogeneous job details

Gang scheduling details

Common job account gathering details (not plugin specific).

Job container plugin details

License management details

Network details. Warning: activating this flag may cause logging of passwords, tokens or other authentication credentials.

Dump raw hex values of key Network communications. Warning: This flag will cause very verbose logs and may cause logging of passwords, tokens or other authentication credentials.

Node Features plugin debug info

Do not log when the slurm.conf files differ between Slurm daemons

Power management plugin and power save (suspend/resume programs) details

Job prioritization

AcctGatherProfile plugins details

Communication protocol details

Advanced reservations

Message forwarding debug info

Debug info regarding the process that runs slurmctld scripts such as PrologSlurmctld and EpilogSlurmctld

Resource selection plugin

Slurmctld resource allocation for job steps

Switch plugin

Timing of Cray APIs

Trace jobs in slurmctld. It will print detailed job information including state, job ids and allocated nodes counter.

Slurmctld triggers

Work Queue details

Default count of CPUs allocated per allocated GPU. This value is used only if the job didn't specify --cpus-per-task and --cpus-per-gpu.

Default real memory size available per usable allocated CPU in megabytes. Used to avoid over-subscribing memory and causing paging. DefMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_res or SelectType=select/cons_tres). The default value is 0 (unlimited). Also see DefMemPerGPU, DefMemPerNode and MaxMemPerCPU. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclusive.

NOTE: This applies to usable allocated CPUs in a job allocation. This is important when more than one thread per core is configured. If a job requests --threads-per-core with fewer threads on a core than exist on the core (or --hint=nomultithread which implies --threads-per-core=1), the job will be unable to use those extra threads on the core and those threads will not be included in the memory per CPU calculation. But if the job has access to all threads on the core, those threads will be included in the memory per CPU calculation even if the job did not explicitly request those threads.

In the following examples, each core has two threads.

In this first example, two tasks can run on separate hyperthreads in the same core because --threads-per-core is not used. The third task uses both threads of the second core. The allocated memory per cpu includes all threads:

$ salloc -n3 --mem-per-cpu=100
salloc: Granted job allocation 17199
$ sacct -j $SLURM_JOB_ID -X -o jobid%7,reqtres%35,alloctres%35


  JobID                             ReqTRES                           AllocTRES
------- ----------------------------------- -----------------------------------


  17199     billing=3,cpu=3,mem=300M,node=1     billing=4,cpu=4,mem=400M,node=1

In this second example, because of --threads-per-core=1, each task is allocated an entire core but is only able to use one thread per core. Allocated CPUs includes all threads on each core. However, allocated memory per cpu includes only the usable thread in each core.

$ salloc -n3 --mem-per-cpu=100 --threads-per-core=1
salloc: Granted job allocation 17200
$ sacct -j $SLURM_JOB_ID -X -o jobid%7,reqtres%35,alloctres%35


  JobID                             ReqTRES                           AllocTRES
------- ----------------------------------- -----------------------------------


  17200     billing=3,cpu=3,mem=300M,node=1     billing=6,cpu=6,mem=300M,node=1

Default real memory size available per allocated GPU in megabytes. The default value is 0 (unlimited). Also see DefMemPerCPU and DefMemPerNode. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclusive.

Default real memory size available per allocated node in megabytes. Used to avoid over-subscribing memory and causing paging. DefMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are over-subscribed (OverSubscribe=yes or OverSubscribe=force). The default value is 0 (unlimited). Also see DefMemPerCPU, DefMemPerGPU and MaxMemPerCPU. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclusive.

Multiple options may be comma separated.
By default, when a federated job has a singleton dependency, each cluster in the federation must clear the singleton dependency before the job's singleton dependency is considered satisfied. Enabling this option means that only the origin cluster must clear the singleton dependency. This option must be set in every cluster in the federation.

If a job has an invalid dependency and it can never run terminate it and set its state to be JOB_CANCELLED. By default the job stays pending with reason DependencyNeverSatisfied.

Maximum number of jobs to test for a circular job dependency. Stop testing after this number of job dependencies have been tested. The default value is 10 jobs.

If set to "YES" then user root will be prevented from running any jobs. The default value is "NO", meaning user root will be able to execute jobs. DisableRootJobs may also be set by partition.

The number of seconds srun waits for slurmstepd to close the TCP/IP connection used to relay data between the user application and srun when the user application terminates. The default value is 60 seconds. May not exceed 65533.

If set to "ALL" then jobs which exceed a partition's size and/or time limits will be rejected at submission time. If job is submitted to multiple partitions, the job must satisfy the limits on all the requested partitions. If set to "NO" then the job will be accepted and remain queued until the partition limits are altered(Time and Node Limits). If set to "ANY" a job must satisfy any of the requested partitions to be submitted. The default value is "NO". NOTE: If set, then a job's QOS can not be used to exceed partition limits. NOTE: The partition limits being considered are its configured MaxMemPerCPU, MaxMemPerNode, MinNodes, MaxNodes, MaxTime, AllocNodes, AllowAccounts, AllowGroups, AllowQOS, and QOS usage threshold.

Fully qualified pathname of a script to execute as user root on every node when a user's job completes (e.g. "/usr/local/slurm/epilog"). A glob pattern (See glob (7)) may also be used to run more than one epilog script (e.g. "/etc/slurm/epilog.d/*"). The Epilog script or scripts may be used to purge files, disable user login, etc. By default there is no epilog. See Prolog and Epilog Scripts for more information.

The number of microseconds that the slurmctld daemon requires to process an epilog completion message from the slurmd daemons. This parameter can be used to prevent a burst of epilog completion messages from being sent at the same time which should help prevent lost messages and improve throughput for large jobs. The default value is 2000 microseconds. For a 1000 node job, this spreads the epilog completion messages out over two seconds.

Fully qualified pathname of a program for the slurmctld to execute upon termination of a job allocation (e.g. "/usr/local/slurm/epilog_controller"). The program executes as SlurmUser, which gives it permission to drain nodes and requeue the job if a failure occurs (See scontrol(1)). Exactly what the program does and how it accomplishes this is completely at the discretion of the system administrator. Information about the job being initiated, its allocated nodes, etc. are passed to the program using environment variables. See Prolog and Epilog Scripts for more information.

The external sensors plugin sampling interval. If ExtSensorsType=ext_sensors/none, this parameter is ignored. For all other values of ExtSensorsType, this parameter is the number of seconds between external sensors samples for hardware components (nodes, switches, etc.) The default value is zero. This value disables external sensors sampling. Note: This parameter does not affect external sensors data collection for jobs/steps.

Identifies the plugin to be used for external sensors data collection. Slurmctld calls this plugin to collect external sensors data for jobs/steps and hardware components. In case of node sharing between jobs the reported values per job/step (through sstat or sacct) may not be accurate. See also "man ext_sensors.conf".

Configurable values at present are:

No external sensors data is collected.

External sensors data is collected from the RRD database.

Dampen the effect of exceeding a user or group's fair share of allocated resources. Higher values will provides greater ability to differentiate between exceeding the fair share at high levels (e.g. a value of 1 results in almost no difference between overconsumption by a factor of 10 and 100, while a value of 5 will result in a significant difference in priority). The default value is 1.

Used to define federation options. Multiple options may be comma separated.
If set, then the client status commands (e.g. squeue, sinfo, sprio, etc.) will display information in a federated view by default. This option is functionally equivalent to using the --federation options on each command. Use the client's --local option to override the federated view and get a local view of the given cluster.

The job id to be used for the first job submitted to Slurm. Job id values generated will incremented by 1 for each subsequent job. Value must be larger than 0. The default value is 1. Also see MaxJobId

Controls how long the job should wait (in seconds) to load the user's environment before attempting to load it from a cache file. Applies when the salloc or sbatch --get-user-env option is used. If set to 0 then always load the user's environment from the cache file. The default value is 2 seconds.

A comma-delimited list of generic resources to be managed (e.g. GresTypes=gpu,mps). These resources may have an associated GRES plugin of the same name providing additional functionality. No generic resources are managed by default. Ensure this parameter is consistent across all nodes in the cluster for proper operation. A restart of slurmctld and the slurmd daemons is required for this to take effect.

If set to a non-zero value, then information about which users are members of groups allowed to use a partition will be updated periodically, even when there have been no changes to the /etc/group file. If set to zero, group member information will be updated only after the /etc/group file is updated. The default value is 1. Also see the GroupUpdateTime parameter.

Controls how frequently information about which users are members of groups allowed to use a partition will be updated, and how long user group membership lists will be cached. The time interval is given in seconds with a default value of 600 seconds. A value of zero will prevent periodic updating of group membership information. Also see the GroupUpdateForce parameter.

Default GPU frequency to use when running a job step if it has not been explicitly set using the --gpu-freq option. This option can be used to independently configure the GPU and its memory frequencies. Defaults to "high,memory=high". After the job is completed, the frequencies of all affected GPUs will be reset to the highest possible values. In some cases, system power caps may override the requested values. The field type can be "memory". If type is not specified, the GPU frequency is implied. The value field can either be "low", "medium", "high", "highm1" or a numeric value in megahertz (MHz). If the specified numeric value is not possible, a value as close as possible will be used. See below for definition of the values. Examples of use include "GpuFreqDef=medium,memory=high and "GpuFreqDef=450".

Supported value definitions:

the lowest available frequency.

attempts to set a frequency in the middle of the available range.

the highest available frequency.

(high minus one) will select the next highest available frequency.

The interval in seconds between executions of HealthCheckProgram. The default value is zero, which disables execution.

Identify what node states should execute the HealthCheckProgram. Multiple state values may be specified with a comma separator. The default value is ANY to execute on nodes in any state.
Run on nodes in the ALLOC state (all CPUs allocated).

Run on nodes in any state.

Rather than running the health check program on all nodes at the same time, cycle through running on all compute nodes through the course of the HealthCheckInterval. May be combined with the various node state options.

Run on nodes in the IDLE state.

Run on nodes in the MIXED state (some CPUs idle and other CPUs allocated).

Fully qualified pathname of a script to execute as user root periodically on all compute nodes that are not in the NOT_RESPONDING state. This program may be used to verify the node is fully operational and DRAIN the node or send email if a problem is detected. Any action to be taken must be explicitly performed by the program (e.g. execute "scontrol update NodeName=foo State=drain Reason=tmp_file_system_full" to drain a node). The execution interval is controlled using the HealthCheckInterval parameter. Note that the HealthCheckProgram will be executed at the same time on all nodes to minimize its impact upon parallel programs. This program will be killed if it does not terminate normally within 60 seconds. This program will also be executed when the slurmd daemon is first started and before it registers with the slurmctld daemon. By default, no program will be executed.

The interval, in seconds, after which a non-responsive job allocation command (e.g. srun or salloc) will result in the job being terminated. If the node on which the command is executed fails or the command abnormally terminates, this will terminate its job allocation. This option has no effect upon batch jobs. When setting a value, take into consideration that a debugger using srun to launch an application may leave the srun command in a stopped state for extended periods of time. This limit is ignored for jobs running in partitions with the RootOnly flag set (the scheduler running as root will be responsible for the job). The default value is unlimited (zero) and may not exceed 65533 seconds.

When LaunchParameters=use_interactive_step is enabled, launching salloc will automatically start an srun process with InteractiveStepOptions to launch a terminal on a node in the job allocation. The default value is "--interactive --preserve-env --pty $SHELL". The "--interactive" option is intentionally not documented in the srun man page. It is meant only to be used in InteractiveStepOptions in order to create an "interactive step" that will not consume resources so that other steps may run in parallel with the interactive step.

The job accounting mechanism type. Acceptable values at present include "jobacct_gather/linux" (for Linux systems), "jobacct_gather/cgroup" and "jobacct_gather/none" (no accounting data collected). The default value is "jobacct_gather/none". "jobacct_gather/cgroup" is a plugin for the Linux operating system that uses cgroups to collect accounting statistics. The plugin collects the following statistics: From the cgroup memory subsystem: memory.usage_in_bytes (reported as 'pages') and rss from memory.stat (reported as 'rss'). From the cgroup cpuacct subsystem: user cpu time and system cpu time. No value is provided by cgroups for virtual memory size ('vsize'). In order to use the sstat tool "jobacct_gather/linux", or "jobacct_gather/cgroup" must be configured.
NOTE: Changing this configuration parameter changes the contents of the messages between Slurm daemons. Any previously running job steps are managed by a slurmstepd daemon that will persist through the lifetime of that job step and not change its communication protocol. Only change this configuration parameter when there are no running job steps.

The job accounting and profiling sampling intervals. The supported format is follows:
where <datatype>=<interval> specifies the task sampling interval for the jobacct_gather plugin or a sampling interval for a profiling type by the acct_gather_profile plugin. Multiple, comma-separated <datatype>=<interval> intervals may be specified. Supported datatypes are as follows:
where <interval> is the task sampling interval in seconds for the jobacct_gather plugins and for task profiling by the acct_gather_profile plugin.

where <interval> is the sampling interval in seconds for energy profiling using the acct_gather_energy plugin

where <interval> is the sampling interval in seconds for infiniband profiling using the acct_gather_interconnect plugin.

where <interval> is the sampling interval in seconds for filesystem profiling using the acct_gather_filesystem plugin.
The default value for task sampling interval is 30 seconds. The default value for all other intervals is 0. An interval of 0 disables sampling of the specified type. If the task sampling interval is 0, accounting information is collected only at job termination, which reduces Slurm interference with the job, but also means that the statistics about a job don't reflect the average or maximum of several samples thoughout the life of the job, but just show the information collected in the single sample.
Smaller (non-zero) values have a greater impact upon job performance, but a value of 30 seconds is not likely to be noticeable for applications having less than 10,000 tasks.
Users can independently override each interval on a per job basis using the --acctg-freq option when submitting the job.

Arbitrary parameters for the job account gather plugin. Acceptable values at present include:
Exclude shared memory from RSS. This option cannot be used with UsePSS.

Use PSS value instead of RSS to calculate real usage of memory. The PSS value will be saved as RSS. This option cannot be used with NoShared.

Kill processes that are being detected to use more memory than requested by steps every time accounting information is gathered by the JobAcctGather plugin. This parameter should be used with caution because a job exceeding its memory allocation may affect other processes and/or machine health.

NOTE: If available, it is recommended to limit memory by enabling task/cgroup as a TaskPlugin and making use of ConstrainRAMSpace=yes in the cgroup.conf instead of using this JobAcctGather mechanism for memory enforcement. Using JobAcctGather is polling based and there is a delay before a job is killed, which could lead to system Out of Memory events.

NOTE: When using OverMemoryKill, if the combined memory used by all the processes in a step exceeds the memory limit, the entire step will be killed/cancelled by the JobAcctGather plugin. This differs from the behavior when using ConstrainRAMSpace, where processes in the step will be killed, but the step will be left active, possibly with other processes left running.

The name of the machine hosting the job completion database. Only used for database type storage plugins, ignored otherwise.

The fully qualified file name where job completion records are written when the JobCompType is "jobcomp/filetxt" or the database where job completion records are stored when the JobCompType is a database, or a complete URL endpoint with format <host>:<port>/<target>/_doc when JobCompType is "jobcomp/elasticsearch" like i.e. "localhost:9200/slurm/_doc". NOTE: More information is available at the Slurm web site <https://slurm.schedmd.com/elasticsearch.html>.

Pass arbitrary text string to job completion plugin. Also see JobCompType.

The password used to gain access to the database to store the job completion data. Only used for database type storage plugins, ignored otherwise.

The listening port of the job completion database server. Only used for database type storage plugins, ignored otherwise.

The job completion logging mechanism type. Acceptable values at present include:
Upon job completion, a record of the job is purged from the system. If using the accounting infrastructure this plugin may not be of interest since some of the information is redundant.

Upon job completion, a record of the job should be written to an Elasticsearch server, specified by the JobCompLoc parameter.
NOTE: More information is available at the Slurm web site ( https://slurm.schedmd.com/elasticsearch.html ).

Upon job completion, a record of the job should be written to a text file, specified by the JobCompLoc parameter.

Upon job completion, a record of the job should be processed by the jobcomp.lua script, located in the default script directory (typically the subdirectory etc of the installation directory.

Upon job completion, a record of the job should be written to a MySQL or MariaDB database, specified by the JobCompLoc parameter.

Upon job completion, a script specified by the JobCompLoc parameter is to be executed with environment variables providing the job information.

The user account for accessing the job completion database. Only used for database type storage plugins, ignored otherwise.

Identifies the plugin to be used for job tracking. A restart of slurmctld is required for changes to this parameter to take effect. NOTE: The JobContainerType applies to a job allocation, while ProctrackType applies to job steps. Acceptable values at present include:
Used only for Cray systems (CNCU = Compute Node Clean Up)

Used for all other system types

Used to create a private namespace on the filesystem for jobs, which houses temporary file systems (/tmp and /dev/shm) for each job. 'PrologFlags=Contain' must be set to use this plugin.

This option controls what to do if a job's output or error file exist when the job is started. If JobFileAppend is set to a value of 1, then append to the existing file. By default, any existing file is truncated.

This option controls the default ability for batch jobs to be requeued. Jobs may be requeued explicitly by a system administrator, after node failure, or upon preemption by a higher priority job. If JobRequeue is set to a value of 1, then batch jobs may be requeued unless explicitly disabled by the user. If JobRequeue is set to a value of 0, then batch jobs will not be requeued unless explicitly enabled by the user. Use the sbatch --no-requeue or --requeue option to change the default behavior for individual jobs. The default value is 1.

These are intended to be site-specific plugins which can be used to set default job parameters and/or logging events. Slurm can be configured to use multiple job_submit plugins if desired, which must be specified as a comma-delimited list and will be executed in the order listed. 
e.g. for multiple job_submit plugin configuration:
JobSubmitPlugins=lua,require_timelimit
Take a look at <https://slurm.schedmd.com/job_submit_plugins.html> for further plugin implementation details. No job submission plugins are used by default. Currently available plugins are:
Set default partition to all partitions on the cluster.

Set default values for job submission or modify requests.

Log select job submission and modification parameters.

Execute a Lua script implementing site's own job_submit logic. Only one Lua script will be executed. It must be named "job_submit.lua" and must be located in the default configuration directory (typically the subdirectory "etc" of the installation directory). Sample Lua scripts can be found with the Slurm distribution, in the directory contribs/lua. Slurmctld will fatal on startup if the configured lua script is invalid. Slurm will try to load the script for each job submission. If the script is broken or removed while slurmctld is running, Slurm will fallback to the previous working version of the script.

Set a job's default partition based upon job submission parameters and available partitions.

Translate PBS job submission options to Slurm equivalent (if possible).

Force job submissions to specify a timelimit.

NOTE: For examples of use see the Slurm code in "src/plugins/job_submit" and "contribs/lua/job_submit*.lua" then modify the code to satisfy your needs.

If set to 1, a step will be terminated immediately if any task is crashed or aborted, as indicated by a non-zero exit code. With the default value of 0, if one of the processes is crashed or aborted the other processes will continue to run while the crashed or aborted process waits. The user can override this configuration parameter by using srun's -K, --kill-on-bad-exit.

The interval, in seconds, given to a job's processes between the SIGTERM and SIGKILL signals upon reaching its time limit. If the job fails to terminate gracefully in the interval specified, it will be forcibly terminated. The default value is 30 seconds. The value may not exceed 65533.

Identifies the plugins to be used for support of node features which can change through time. For example, a node which might be booted with various BIOS setting. This is supported through the use of a node's active_features and available_features information. Acceptable values at present include:
Used only for Intel Knights Landing processors (KNL) on Cray systems.

Used for Intel Knights Landing processors (KNL) on a generic Linux system.

Used to report and modify features on nodes using arbitrary scripts or programs.

Identifies options to the job launch plugin. Acceptable values include:
Set the cpu frequency for the batch step from given --cpu-freq, or slurm.conf CpuFreqDef, option. By default only steps started with srun will utilize the cpu freq setting options.

NOTE: If you are using srun to launch your steps inside a batch script (advised) this option will create a situation where you may have multiple agents setting the cpu_freq as the batch step usually runs on the same resources one or more steps the sruns in the script will create.

Allow jobs on a Cray Native cluster exclusive access to network resources. This should only be set on clusters providing exclusive access to each node to a single job at once, and not using parallel steps within the job, otherwise resources on the node can be oversubscribed.

Permits passwd and group resolution for a job to be serviced by slurmstepd rather than requiring a lookup from a network based service. See https://slurm.schedmd.com/nss_slurm.html for more information.

If set on a Cray Native cluster, then do not flush the Lustre cache on job step completion. This setting will only take effect after reconfiguring, and will only take effect for newly launched jobs.

Sort NUMA memory at step start. User can override this default with SLURM_MEM_BIND environment variable or --mem-bind=nosort command line option.

When launching tasks Slurm creates entries in MPIR_proctable that are used by parallel debuggers, profilers, and related tools to attach to running process. By default the MPIR_proctable entries contain MPIR_procdesc structures where the host_name is set to NodeName by default. If this option is specified, NodeAddr will be used in this context instead.

By default, the slurmctld will look up and send the user_name and extended gids for a job, rather than independently on each node as part of each task launch. This helps mitigate issues around name service scalability when launching jobs involving many nodes. Using this option will disable this functionality. This option is ignored if enable_nss_slurm is specified.

Lock the slurmstepd process's current memory in RAM.

Lock the slurmstepd process's current and future memory in RAM.

Have srun verify existence of the executable program along with user execute permission on the node where srun was called before attempting to launch it on nodes in the step.

Have salloc use the Interactive Step to launch a shell on an allocated compute node rather than locally to wherever salloc was invoked. This is accomplished by launching the srun command with InteractiveStepOptions as options.

This does not affect salloc called with a command as an argument. These jobs will continue to be executed as the calling user on the calling host.

Identifies the mechanism to be used to launch application tasks. Acceptable values include:
The default value.

Specification of licenses (or other resources available on all nodes of the cluster) which can be allocated to jobs. License names can optionally be followed by a colon and count with a default count of one. Multiple license names should be comma separated (e.g. "Licenses=foo:4,bar"). Note that Slurm prevents jobs from being scheduled if their required license specification is not available. Slurm does not prevent jobs from using licenses that are not explicitly listed in the job submission specification.

Format of the timestamp in slurmctld and slurmd log files. Accepted values are "iso8601", "iso8601_ms", "rfc5424", "rfc5424_ms", "clock", "short" and "thread_id". The values ending in "_ms" differ from the ones without in that fractional seconds with millisecond precision are printed. The default value is "iso8601_ms". The "rfc5424" formats are the same as the "iso8601" formats except that the timezone value is also shown. The "clock" format shows a timestamp in microseconds retrieved with the C standard clock() function. The "short" format is a short date and time format. The "thread_id" format shows the timestamp in the C standard ctime() function form without the year but including the microseconds, the daemon's process ID and the current thread name and ID.

Domain name to qualify usernames if email address is not explicitly given with the "--mail-user" option. If unset, the local MTA will need to qualify local address itself. Changes to MailDomain will only affect new jobs.

Fully qualified pathname to the program used to send email per user request. The default value is "/bin/mail" (or "/usr/bin/mail" if "/bin/mail" does not exist but "/usr/bin/mail" does exist). The program is called with arguments suitable for the default mail command, however additional information about the job is passed in the form of environment variables.

Additional variables are the same as those passed to PrologSlurmctld and EpilogSlurmctld with additional variables in the following contexts:

The base state of the job when the MailProg is called.
The mail type triggering the mail.
The amount of time the job was queued.
The amount of time the job ran for.
Job's exit code or highest exit code for an array job.
Job's minimum exit code for an array job.
Job's highest signal for an array job.
Job's staging out time.

The maximum job array task index value will be one less than MaxArraySize to allow for an index value of zero. Configure MaxArraySize to 0 in order to disable job array use. The value may not exceed 4000001. The value of MaxJobCount should be much larger than MaxArraySize. The default value is 1001. See also max_array_tasks in SchedulerParameters.

When communication to the SlurmDBD is not possible the slurmctld will queue messages meant to processed when the SlurmDBD is available again. In order to avoid running out of memory the slurmctld will only queue so many messages. The default value is 10000, or MaxJobCount * 2 + Node Count * 4, whichever is greater. The value can not be less than 10000.

The maximum number of jobs slurmctld can have in memory at one time. Combine with MinJobAge to ensure the slurmctld daemon does not exhaust its memory or other resources. Once this limit is reached, requests to submit additional jobs will fail. The default value is 10000 jobs. NOTE: Each task of a job array counts as one job even though they will not occupy separate job records until modified or initiated. Performance can suffer with more than a few hundred thousand jobs. Setting per MaxSubmitJobs per user is generally valuable to prevent a single user from filling the system with jobs. This is accomplished using Slurm's database and configuring enforcement of resource limits. A restart of slurmctld is required for changes to this parameter to take effect.

The maximum job id to be used for jobs submitted to Slurm without a specific requested value. Job ids are unsigned 32bit integers with the first 26 bits reserved for local job ids and the remaining 6 bits reserved for a cluster id to identify a federated job's origin. The maximum allowed local job id is 67,108,863 (0x3FFFFFF). The default value is 67,043,328 (0x03ff0000). MaxJobId only applies to the local job id and not the federated job id. Job id values generated will be incremented by 1 for each subsequent job. Once MaxJobId is reached, the next job will be assigned FirstJobId. Federated jobs will always have a job ID of 67,108,865 or higher. Also see FirstJobId.

Maximum real memory size available per allocated CPU in megabytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_res or SelectType=select/cons_tres). The default value is 0 (unlimited). Also see DefMemPerCPU, DefMemPerGPU and MaxMemPerNode. MaxMemPerCPU and MaxMemPerNode are mutually exclusive.

NOTE: If a job specifies a memory per CPU limit that exceeds this system limit, that job's count of CPUs per task will try to automatically increase. This may result in the job failing due to CPU count limits. This auto-adjustment feature is a best-effort one and optimal assignment is not guaranteed due to the possibility of having heterogeneous configurations and multi-partition/qos jobs. If this is a concern it is advised to use a job submit LUA plugin instead to enforce auto-adjustments to your specific needs.

Maximum real memory size available per allocated node in megabytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are over-subscribed (OverSubscribe=yes or OverSubscribe=force). The default value is 0 (unlimited). Also see DefMemPerNode and MaxMemPerCPU. MaxMemPerCPU and MaxMemPerNode are mutually exclusive.

Maximum count of nodes which may exist in the controller. By default MaxNodeCount will be set to the number of nodes found in the slurm.conf. MaxNodeCount will be ignored if less than the number of nodes found in the slurm.conf. Increase MaxNodeCount to accommodate dynamically created nodes with dynamic node registrations and nodes created with scontrol. The slurmctld daemon must be restarted for changes to this parameter to take effect.

The maximum number of steps that any job can initiate. This parameter is intended to limit the effect of bad batch scripts. The default value is 40000 steps.

Maximum number of tasks Slurm will allow a job step to spawn on a single node. The default MaxTasksPerNode is 512. May not exceed 65533.

MCS = Multi-Category Security MCS Plugin Parameters. The supported parameters are specific to the MCSPlugin. Changes to this value take effect when the Slurm daemons are reconfigured. More information about MCS is available here <https://slurm.schedmd.com/mcs.html>.

MCS = Multi-Category Security : associate a security label to jobs and ensure that nodes can only be shared among jobs using the same security label. Acceptable values include:
is the default value. No security label associated with jobs, no particular security restriction when sharing nodes among jobs.

only users with the same account can share the nodes (requires enabling of accounting).

only users with the same group can share the nodes.

a node cannot be shared with other users.

Time permitted for a round-trip communication to complete in seconds. Default value is 10 seconds. For systems with shared nodes, the slurmd daemon could be paged out and necessitate higher values.

The minimum age of a completed job before its record is cleared from the list of jobs slurmctld keeps in memory. Combine with MaxJobCount to ensure the slurmctld daemon does not exhaust its memory or other resources. The default value is 300 seconds. A value of zero prevents any job record purging. Jobs are not purged during a backfill cycle, so it can take longer than MinJobAge seconds to purge a job if using the backfill scheduling plugin. In order to eliminate some possible race conditions, the minimum non-zero value for MinJobAge recommended is 2.

Identifies the default type of MPI to be used. Srun may override this configuration parameter in any case. Currently supported versions include: pmi2, pmix, and none (default, which works for many other versions of MPI). More information about MPI use is available here <https://slurm.schedmd.com/mpi_guide.html>.

MPI parameters. Used to identify ports used by native Cray's PMI. The format to identify a range of communication ports is "ports=12000-12999".

Number of minutes by which a job can exceed its time limit before being canceled. Normally a job's time limit is treated as a hard limit and the job will be killed upon reaching that limit. Configuring OverTimeLimit will result in the job's time limit being treated like a soft limit. Adding the OverTimeLimit value to the soft time limit provides a hard time limit, at which point the job is canceled. This is particularly useful for backfill scheduling, which bases upon each job's soft time limit. The default value is zero. May not exceed 65533 minutes. A value of "UNLIMITED" is also supported.

Identifies the places in which to look for Slurm plugins. This is a colon-separated list of directories, like the PATH environment variable. The default value is the prefix given at configure time + "/lib/slurm". A restart of slurmctld and the slurmd daemons is required for changes to this parameter to take effect.

Location of the config file for Slurm stackable plugins that use the Stackable Plugin Architecture for Node job (K)control (SPANK). This provides support for a highly configurable set of plugins to be called before and/or after execution of each task spawned as part of a user's job step. Default location is "plugstack.conf" in the same directory as the system slurm.conf. For more information on SPANK plugins, see the spank(7) manual.

System power management parameters. The supported parameters are specific to the PowerPlugin. Changes to this value take effect when the Slurm daemons are reconfigured. More information about system power management is available here <https://slurm.schedmd.com/power_mgmt.html>. Options current supported by any plugins are listed below.
Specifies the time interval, in seconds, between attempts to rebalance power caps across the nodes. This also controls the frequency at which Slurm attempts to collect current power consumption data (old data may be used until new data is available from the underlying infrastructure and values below 10 seconds are not recommended for Cray systems). The default value is 30 seconds. Supported by the power/cray_aries plugin.

Specifies the absolute path of the capmc command. The default value is "/opt/cray/capmc/default/bin/capmc". Supported by the power/cray_aries plugin.

Specifies the total power limit to be established across all compute nodes managed by Slurm. A value of 0 sets every compute node to have an unlimited cap. The default value is 0. Supported by the power/cray_aries plugin.

Specifies the maximum rate of change in the power cap for a node where the actual power usage is below the power cap by an amount greater than lower_threshold (see below). Value represents a percentage of the difference between a node's minimum and maximum power consumption. The default value is 50 percent. Supported by the power/cray_aries plugin.

Amount of time allowed to get power state information in milliseconds. The default value is 5,000 milliseconds or 5 seconds. Supported by the power/cray_aries plugin and represents the time allowed for the capmc command to respond to various "get" options.

Specifies the maximum rate of change in the power cap for a node where the actual power usage is within upper_threshold (see below) of the power cap. Value represents a percentage of the difference between a node's minimum and maximum power consumption. The default value is 20 percent. Supported by the power/cray_aries plugin.

All nodes associated with every job will have the same power cap, to the extent possible. Also see the --power=level option on the job submission commands.

Disable the user's ability to set every node associated with a job to the same power cap. Each node will have its power cap set independently. This disables the --power=level option on the job submission commands.

Specify a lower power consumption threshold. If a node's current power consumption is below this percentage of its current cap, then its power cap will be reduced. The default value is 90 percent. Supported by the power/cray_aries plugin.

If a job has started or resumed execution (from suspend) on a compute node within this number of seconds from the current time, the node's power cap will be increased to the maximum. The default value is 300 seconds. Supported by the power/cray_aries plugin.

Amount of time allowed to set power state information in milliseconds. The default value is 30,000 milliseconds or 30 seconds. Supported by the power/cray plugin and represents the time allowed for the capmc command to respond to various "set" options.

Specifies the power limit to be set on every compute nodes managed by Slurm. Every node gets this same power cap and there is no variation through time based upon actual power usage on the node. Supported by the power/cray_aries plugin.

Specify an upper power consumption threshold. If a node's current power consumption is above this percentage of its current cap, then its power cap will be increased to the extent possible. The default value is 95 percent. Supported by the power/cray_aries plugin.

Identifies the plugin used for system power management. Currently supported plugins include: cray_aries and none. A restart of slurmctld is required for changes to this parameter to take effect. More information about system power management is available here <https://slurm.schedmd.com/power_mgmt.html>. By default, no power plugin is loaded.

Mechanism used to preempt jobs or enable gang scheduling. When the PreemptType parameter is set to enable preemption, the PreemptMode selects the default mechanism used to preempt the eligible jobs for the cluster.
PreemptMode may be specified on a per partition basis to override this default value if PreemptType=preempt/partition_prio. Alternatively, it can be specified on a per QOS basis if PreemptType=preempt/qos. In either case, a valid default PreemptMode value must be specified for the cluster as a whole when preemption is enabled.
The GANG option is used to enable gang scheduling independent of whether preemption is enabled (i.e. independent of the PreemptType setting). It can be specified in addition to a PreemptMode setting with the two options comma separated (e.g. PreemptMode=SUSPEND,GANG).
See <https://slurm.schedmd.com/preempt.html> and <https://slurm.schedmd.com/gang_scheduling.html> for more details.

NOTE: For performance reasons, the backfill scheduler reserves whole nodes for jobs, not partial nodes. If during backfill scheduling a job preempts one or more other jobs, the whole nodes for those preempted jobs are reserved for the preemptor job, even if the preemptor job requested fewer resources than that. These reserved nodes aren't available to other jobs during that backfill cycle, even if the other jobs could fit on the nodes. Therefore, jobs may preempt more resources during a single backfill iteration than they requested.
NOTE: For heterogeneous job to be considered for preemption all components must be eligible for preemption. When a heterogeneous job is to be preempted the first identified component of the job with the highest order PreemptMode (SUSPEND (highest), REQUEUE, CANCEL (lowest)) will be used to set the PreemptMode for all components. The GraceTime and user warning signal for each component of the heterogeneous job remain unique. Heterogeneous jobs are excluded from GANG scheduling operations.

Is the default value and disables job preemption and gang scheduling. It is only compatible with PreemptType=preempt/none at a global level. A common use case for this parameter is to set it on a partition to disable preemption for that partition.

The preempted job will be cancelled.

Enables gang scheduling (time slicing) of jobs in the same partition, and allows the resuming of suspended jobs.

NOTE: Gang scheduling is performed independently for each partition, so if you only want time-slicing by OverSubscribe, without any preemption, then configuring partitions with overlapping nodes is not recommended. On the other hand, if you want to use PreemptType=preempt/partition_prio to allow jobs from higher PriorityTier partitions to Suspend jobs from lower PriorityTier partitions you will need overlapping partitions, and PreemptMode=SUSPEND,GANG to use the Gang scheduler to resume the suspended jobs(s). In any case, time-slicing won't happen between jobs on different partitions.

NOTE: Heterogeneous jobs are excluded from GANG scheduling operations.

Preempts jobs by requeuing them (if possible) or canceling them. For jobs to be requeued they must have the --requeue sbatch option set or the cluster wide JobRequeue parameter in slurm.conf must be set to 1.

The preempted jobs will be suspended, and later the Gang scheduler will resume them. Therefore the SUSPEND preemption mode always needs the GANG option to be specified at the cluster level. Also, because the suspended jobs will still use memory on the allocated nodes, Slurm needs to be able to track memory resources to be able to suspend jobs.
If PreemptType=preempt/qos is configured and if the preempted job(s) and the preemptor job are on the same partition, then they will share resources with the Gang scheduler (time-slicing). If not (i.e. if the preemptees and preemptor are on different partitions) then the preempted jobs will remain suspended until the preemptor ends.

NOTE: Because gang scheduling is performed independently for each partition, if using PreemptType=preempt/partition_prio then jobs in higher PriorityTier partitions will suspend jobs in lower PriorityTier partitions to run on the released resources. Only when the preemptor job ends will the suspended jobs will be resumed by the Gang scheduler.
NOTE: Suspended jobs will not release GRES. Higher priority jobs will not be able to preempt to gain access to GRES.

For PreemptType=preempt/qos, allow jobs within the same qos to preempt one another. While this can be set globally here, it is recommend that this only be set directly on a relevant subset of the system qos values instead.

Specifies the plugin used to identify which jobs can be preempted in order to start a pending job.
Job preemption is disabled. This is the default.

Job preemption is based upon partition PriorityTier. Jobs in higher PriorityTier partitions may preempt jobs from lower PriorityTier partitions. This is not compatible with PreemptMode=OFF.

Job preemption rules are specified by Quality Of Service (QOS) specifications in the Slurm database. This option is not compatible with PreemptMode=OFF. A configuration of PreemptMode=SUSPEND is only supported by the SelectType=select/cons_res and SelectType=select/cons_tres plugins. See the sacctmgr man page to configure the options for preempt/qos.

Global option for minimum run time for all jobs before they can be considered for preemption. Any QOS PreemptExemptTime takes precedence over the global option. This is only honored for PreemptMode=REQUEUE and PreemptMode=CANCEL.
A time of -1 disables the option, equivalent to 0. Acceptable time formats include "minutes", "minutes:seconds", "hours:minutes:seconds", "days-hours", "days-hours:minutes", and "days-hours:minutes:seconds".

Parameters to be passed to the PrEpPlugins.

A resource for programmers wishing to write their own plugins for the Prolog and Epilog (PrEp) scripts. The default, and currently the only implemented plugin is prep/script. Additional plugins can be specified in a comma-separated list. For more information please see the PrEp Plugin API documentation page: <https://slurm.schedmd.com/prep_plugins.html>

The period of time in minutes in which the half-life decay will be re-calculated. Applicable only if PriorityType=priority/multifactor. The default value is 5 (minutes).

This controls how long prior resource use is considered in determining how over- or under-serviced an association is (user, bank account and cluster) in determining job priority. The record of usage will be decayed over time, with half of the original value cleared at age PriorityDecayHalfLife. If set to 0 no decay will be applied. This is helpful if you want to enforce hard time limits per association. If set to 0 PriorityUsageResetPeriod must be set to some interval. Applicable only if PriorityType=priority/multifactor. The unit is a time string (i.e. min, hr:min:00, days-hr:min:00, or days-hr). The default value is 7-0 (7 days).

Specifies that small jobs should be given preferential scheduling priority. Applicable only if PriorityType=priority/multifactor. Supported values are "YES" and "NO". The default value is "NO".

Flags to modify priority behavior. Applicable only if PriorityType=priority/multifactor. The keywords below have no associated value (e.g. "PriorityFlags=ACCRUE_ALWAYS,SMALL_RELATIVE_TO_TIME").
If set, priority age factor will be increased despite job ineligibility due to either dependencies, holds or begin time in the future. Accrue limits are ignored.

If set, priorities will be recalculated not only for pending jobs, but also running and suspended jobs.

If set, priority will be calculated based similar to the normal multifactor calculation, but depth of the associations in the tree does not adversely affect their priority. This option automatically enables NO_FAIR_TREE.

Disables the "fair tree" algorithm, and reverts to "classic" fair share priority scheduling.

If set, priority values will only increase in value. Job priority will never decrease in value.

If set, the weighted TRES value (e.g. TRESBillingWeights) is calculated as the MAX of individual TRES' on a node (e.g. cpus, mem, gres) plus the sum of all global TRES' (e.g. licenses).

If set, all NO_NORMAL_* flags are set.

If set, the association factor is not normalized against the highest association priority.

If set, the partition factor is not normalized against the highest partition PriorityJobFactor.

If set, the QOS factor is not normalized against the highest qos priority.

If set, the TRES factor is not normalized against the job's partition TRES counts.

If set, the job's size component will be based upon not the job size alone, but the job's size divided by its time limit.

Specifies the job age which will be given the maximum age factor in computing priority. For example, a value of 30 minutes would result in all jobs over 30 minutes old would get the same age-based priority. Applicable only if PriorityType=priority/multifactor. The unit is a time string (i.e. min, hr:min:00, days-hr:min:00, or days-hr). The default value is 7-0 (7 days).

Arbitrary string used by the PriorityType plugin.

Arbitrary string used by the PrioritySiteFactorPlugin plugin.

The specifies an optional plugin to be used alongside "priority/multifactor", which is meant to initially set and continuously update the SiteFactor priority factor. The default value is "site_factor/none".

This specifies the plugin to be used in establishing a job's scheduling priority. Also see PriorityFlags for configuration options. The default value is "priority/basic".
Jobs are evaluated in a First In, First Out (FIFO) manner.

Jobs are assigned a priority based upon a variety of factors that include size, age, Fairshare, etc.
When not FIFO scheduling, jobs are prioritized in the following order:

1. Jobs that can preempt
2. Jobs with an advanced reservation
3. Partition PriorityTier
4. Job priority
5. Job submit time
6. Job ID

At this interval the usage of associations will be reset to 0. This is used if you want to enforce hard limits of time usage per association. If PriorityDecayHalfLife is set to be 0 no decay will happen and this is the only way to reset the usage accumulated by running jobs. By default this is turned off and it is advised to use the PriorityDecayHalfLife option to avoid not having anything running on your cluster, but if your schema is set up to only allow certain amounts of time on your system this is the way to do it. Applicable only if PriorityType=priority/multifactor.
Never clear historic usage. The default value.

Clear the historic usage now. Executed at startup and reconfiguration time.

Cleared every day at midnight.

Cleared every week on Sunday at time 00:00.

Cleared on the first day of each month at time 00:00.

Cleared on the first day of each quarter at time 00:00.

Cleared on the first day of each year at time 00:00.

An integer value that sets the degree to which the queue wait time component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. Requires AccountingStorageType=accounting_storage/slurmdbd. The default value is 0.

An integer value that sets the degree to which the association component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0.

An integer value that sets the degree to which the fair-share component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. Requires AccountingStorageType=accounting_storage/slurmdbd. The default value is 0.

An integer value that sets the degree to which the job size component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0.

Partition factor used by priority/multifactor plugin in calculating job priority. Applicable only if PriorityType=priority/multifactor. The default value is 0.

An integer value that sets the degree to which the Quality Of Service component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0.

A comma-separated list of TRES Types and weights that sets the degree that each TRES Type contributes to the job's priority.
e.g.
PriorityWeightTRES=CPU=1000,Mem=2000,GRES/gpu=3000

Applicable only if PriorityType=priority/multifactor and if AccountingStorageTRES is configured with each TRES Type. Negative values are allowed. The default values are 0.

This controls what type of information is hidden from regular users. By default, all information is visible to all users. User SlurmUser and root can always view all information. Multiple values may be specified with a comma separator. Acceptable values include:
(NON-SlurmDBD ACCOUNTING ONLY) Prevents users from viewing any account definitions unless they are coordinators of them.

Powered down nodes in the cloud are visible. Without this flag, cloud nodes will not appear in the output of commands like sinfo unless they are powered on, even for SlurmUser and root.

prevents users from viewing event information unless they have operator status or above.

Prevents users from viewing jobs or job steps belonging to other users. (NON-SlurmDBD ACCOUNTING ONLY) Prevents users from viewing job records belonging to other users unless they are coordinators of the association running the job when using sacct.

Prevents users from viewing node state information.

Prevents users from viewing partition state information.

Prevents regular users from viewing reservations which they can not use.

Prevents users from viewing usage of any other user, this applies to sshare. (NON-SlurmDBD ACCOUNTING ONLY) Prevents users from viewing usage of any other user, this applies to sreport.

(NON-SlurmDBD ACCOUNTING ONLY) Prevents users from viewing information of any user other than themselves, this also makes it so users can only see associations they deal with. Coordinators can see associations of all users in the account they are coordinator of, but can only see themselves when listing users.

Identifies the plugin to be used for process tracking on a job step basis. The slurmd daemon uses this mechanism to identify all processes which are children of processes it spawns for a user job step. A restart of slurmctld is required for changes to this parameter to take effect. NOTE: "proctrack/linuxproc" and "proctrack/pgid" can fail to identify all processes associated with a job since processes can become a child of the init process (when the parent process terminates) or change their process group. To reliably track all processes, "proctrack/cgroup" is highly recommended. NOTE: The JobContainerType applies to a job allocation, while ProctrackType applies to job steps. Acceptable values at present include:
Uses linux cgroups to constrain and track processes, and is the default for systems with cgroup support.
NOTE: see "man cgroup.conf" for configuration details.

Uses Cray proprietary process tracking.

Uses linux process tree using parent process IDs.

Uses Process Group IDs.
NOTE: This is the default for the BSD family.

Fully qualified pathname of a program for the slurmd to execute whenever it is asked to run a job step from a new job allocation (e.g. "/usr/local/slurm/prolog"). A glob pattern (See glob (7)) may also be used to specify more than one program to run (e.g. "/etc/slurm/prolog.d/*"). The slurmd executes the prolog before starting the first job step. The prolog script or scripts may be used to purge files, enable user login, etc. By default there is no prolog. Any configured script is expected to complete execution quickly (in less time than MessageTimeout). If the prolog fails (returns a non-zero exit code), this will result in the node being set to a DRAIN state and the job being requeued in a held state, unless nohold_on_prolog_fail is configured in SchedulerParameters. See Prolog and Epilog Scripts for more information.

The interval in seconds Slurm waits for Prolog and Epilog before terminating them. The default behavior is to wait indefinitely. This interval applies to the Prolog and Epilog run by slurmd daemon before and after the job, the PrologSlurmctld and EpilogSlurmctld run by slurmctld daemon, and the SPANK plugin prolog/epilog calls: slurm_spank_job_prolog and slurm_spank_job_epilog.
If the PrologSlurmctld times out, the job is requeued if possible. If the Prolog or slurm_spank_job_prolog time out, the job is requeued if possible and the node is drained. If the Epilog or slurm_spank_job_epilog time out, the node is drained. In all cases, errors are logged.

Flags to control the Prolog behavior. By default no flags are set. Multiple flags may be specified in a comma-separated list. Currently supported options are:
If set, the Prolog script will be executed at job allocation. By default, Prolog is executed just before the task is launched. Therefore, when salloc is started, no Prolog is executed. Alloc is useful for preparing things before a user starts to use any allocated resources. In particular, this flag is needed on a Cray system when cluster compatibility mode is enabled.

NOTE: Use of the Alloc flag will increase the time required to start jobs.

At job allocation time, use the ProcTrack plugin to create a job container on all allocated compute nodes. This container may be used for user processes not launched under Slurm control, for example pam_slurm_adopt may place processes launched through a direct user login into this container. If using pam_slurm_adopt, then ProcTrackType must be set to either proctrack/cgroup or proctrack/cray_aries. Setting the Contain implicitly sets the Alloc flag.

If set, slurmctld will wait until the prolog completes on all allocated nodes before sending the batch job launch request. With just the Alloc flag, slurmctld will launch the batch step as soon as the first node in the job allocation completes the prolog.

If set, the Alloc flag should also be set. This will allow for salloc to not block until the prolog is finished on each node. The blocking will happen when steps reach the slurmd and before any execution has happened in the step. This is a much faster way to work and if using srun to launch your tasks you should use this flag. This flag cannot be combined with the Contain or X11 flags.

By default, the Prolog and Epilog scripts run concurrently on each node. This flag forces those scripts to run serially within each node, but with a significant penalty to job throughput on each node.

Enable Slurm's built-in X11 forwarding capabilities. This is incompatible with ProctrackType=proctrack/linuxproc. Setting the X11 flag implicitly enables both Contain and Alloc flags as well.

Fully qualified pathname of a program for the slurmctld daemon to execute before granting a new job allocation (e.g. "/usr/local/slurm/prolog_controller"). The program executes as SlurmUser on the same node where the slurmctld daemon executes, giving it permission to drain nodes and requeue the job if a failure occurs or cancel the job if appropriate. Exactly what the program does and how it accomplishes this is completely at the discretion of the system administrator. Information about the job being initiated, its allocated nodes, etc. are passed to the program using environment variables. While this program is running, the nodes associated with the job will be have a POWER_UP/CONFIGURING flag set in their state, which can be readily viewed. The slurmctld daemon will wait indefinitely for this program to complete. Once the program completes with an exit code of zero, the nodes will be considered ready for use and the program will be started. If some node can not be made available for use, the program should drain the node (typically using the scontrol command) and terminate with a non-zero exit code. A non-zero exit code will result in the job being requeued (where possible) or killed. Note that only batch jobs can be requeued. See Prolog and Epilog Scripts for more information.

Controls the scheduling priority (nice value) of user spawned tasks.
0
The tasks will inherit the scheduling priority from the slurm daemon. This is the default value.

1
The tasks will inherit the scheduling priority of the command used to submit them (e.g. srun or sbatch). Unless the job is submitted by user root, the tasks will have a scheduling priority no higher than the slurm daemon spawning them.

2
The tasks will inherit the scheduling priority of the command used to submit them (e.g. srun or sbatch) with the restriction that their nice value will always be one higher than the slurm daemon (i.e. the tasks scheduling priority will be lower than the slurm daemon).

A comma-separated list of resource limit names. The slurmd daemon uses these names to obtain the associated (soft) limit values from the user's process environment on the submit node. These limits are then propagated and applied to the jobs that will run on the compute nodes. This parameter can be useful when system limits vary among nodes. Any resource limits that do not appear in the list are not propagated. However, the user can override this by specifying which resource limits to propagate with the sbatch or srun "--propagate" option. If neither PropagateResourceLimits or PropagateResourceLimitsExcept are configured and the "--propagate" option is not specified, then the default action is to propagate all limits. Only one of the parameters, either PropagateResourceLimits or PropagateResourceLimitsExcept, may be specified. The user limits can not exceed hard limits under which the slurmd daemon operates. If the user limits are not propagated, the limits from the slurmd daemon will be propagated to the user's job. The limits used for the Slurm daemons can be set in the /etc/sysconf/slurm file. For more information, see: https://slurm.schedmd.com/faq.html#memlock The following limit names are supported by Slurm (although some options may not be supported on some systems):
All limits listed below (default)

No limits listed below

The maximum address space (virtual memory) for a process.

The maximum size of core file

The maximum amount of CPU time

The maximum size of a process's data segment

The maximum size of files created. Note that if the user sets FSIZE to less than the current size of the slurmd.log, job launches will fail with a 'File size limit exceeded' error.

The maximum size that may be locked into memory

The maximum number of open files

The maximum number of processes available

The maximum resident set size. Note that this only has effect with Linux kernels 2.4.30 or older or BSD.

The maximum stack size

A comma-separated list of resource limit names. By default, all resource limits will be propagated, (as described by the PropagateResourceLimits parameter), except for the limits appearing in this list. The user can override this by specifying which resource limits to propagate with the sbatch or srun "--propagate" option. See PropagateResourceLimits above for a list of valid limit names.

Program to be executed on each compute node to reboot it. Invoked on each node once it becomes idle after the command "scontrol reboot" is executed by an authorized user or a job is submitted with the "--reboot" option. After rebooting, the node is returned to normal use. See ResumeTimeout to configure the time you expect a reboot to finish in. A node will be marked DOWN if it doesn't reboot within ResumeTimeout.

Flags to control various actions that may be taken when an "scontrol reconfig" command is issued. Currently the options are:
If set, an "scontrol reconfig" command will maintain the in-memory value of partition "state" and other parameters that may have been dynamically updated by "scontrol update". Partition information in the slurm.conf file will be merged with in-memory data. This flag supersedes the KeepPartState flag.

If set, an "scontrol reconfig" command will preserve only the current "state" value of in-memory partitions and will reset all other parameters of the partitions that may have been dynamically updated by "scontrol update" to the values from the slurm.conf file. Partition information in the slurm.conf file will be merged with in-memory data.
The default for the above flags is not set, and the "scontrol reconfig" will rebuild the partition information using only the definitions in the slurm.conf file.

Enables automatic requeue for batch jobs which exit with the specified values. Separate multiple exit code by a comma and/or specify numeric ranges using a "-" separator (e.g. "RequeueExit=1-9,18") Jobs will be put back in to pending state and later scheduled again. Restarted jobs will have the environment variable SLURM_RESTART_COUNT set to the number of times the job has been restarted.

Enables automatic requeue for batch jobs which exit with the specified values, with these jobs being held until released manually by the user. Separate multiple exit code by a comma and/or specify numeric ranges using a "-" separator (e.g. "RequeueExitHold=10-12,16") These jobs are put in the JOB_SPECIAL_EXIT exit state. Restarted jobs will have the environment variable SLURM_RESTART_COUNT set to the number of times the job has been restarted.

The program that will be executed when nodes fail to resume to by ResumeTimeout. The argument to the program will be the names of the failed nodes (using Slurm's hostlist expression format).

Slurm supports a mechanism to reduce power consumption on nodes that remain idle for an extended period of time. This is typically accomplished by reducing voltage and frequency or powering the node down. ResumeProgram is the program that will be executed when a node in power save mode is assigned work to perform. For reasons of reliability, ResumeProgram may execute more than once for a node when the slurmctld daemon crashes and is restarted. If ResumeProgram is unable to restore a node to service with a responding slurmd and an updated BootTime, it should set the node state to DOWN, which will result in a requeue of any job associated with the node - this will happen automatically if the node doesn't register within ResumeTimeout. If the node isn't actually rebooted (i.e. when multiple-slurmd is configured) starting slurmd with "-b" option might be useful. The program executes as SlurmUser. The argument to the program will be the names of nodes to be removed from power savings mode (using Slurm's hostlist expression format). A job to node mapping is available in JSON format by reading the temporary file specified by the SLURM_RESUME_FILE environment variable. By default no program is run.

The rate at which nodes in power save mode are returned to normal operation by ResumeProgram. The value is a number of nodes per minute and it can be used to prevent power surges if a large number of nodes in power save mode are assigned work at the same time (e.g. a large job starts). A value of zero results in no limits being imposed. The default value is 300 nodes per minute.

Maximum time permitted (in seconds) between when a node resume request is issued and when the node is actually available for use. Nodes which fail to respond in this time frame will be marked DOWN and the jobs scheduled on the node requeued. Nodes which reboot after this time frame will be marked DOWN with a reason of "Node unexpectedly rebooted." The default value is 60 seconds.

Fully qualified pathname of a program for the slurmctld to execute when a reservation ends. The program can be used to cancel jobs, modify partition configuration, etc. The reservation named will be passed as an argument to the program. By default there is no epilog.

Describes how long a job already running in a reservation should be permitted to execute after the end time of the reservation has been reached. The time period is specified in minutes and the default value is 0 (kill the job immediately). The value may not exceed 65533 minutes, although a value of "UNLIMITED" is supported to permit a job to run indefinitely after its reservation is terminated.

Fully qualified pathname of a program for the slurmctld to execute when a reservation begins. The program can be used to cancel jobs, modify partition configuration, etc. The reservation named will be passed as an argument to the program. By default there is no prolog.

Controls when a DOWN node will be returned to service. The default value is 0. Supported values include
0
A node will remain in the DOWN state until a system administrator explicitly changes its state (even if the slurmd daemon registers and resumes communications).

1
A DOWN node will become available for use upon registration with a valid configuration only if it was set DOWN due to being non-responsive. If the node was set DOWN for any other reason (low memory, unexpected reboot, etc.), its state will not automatically be changed. A node registers with a valid configuration if its memory, GRES, CPU count, etc. are equal to or greater than the values configured in slurm.conf.

2
A DOWN node will become available for use upon registration with a valid configuration. The node could have been set DOWN for any reason. A node registers with a valid configuration if its memory, GRES, CPU count, etc. are equal to or greater than the values configured in slurm.conf.

Identifies the plugin to be used for defining which nodes will be used for message forwarding.
default, use TreeWidth.

use the switch hierarchy defined in a topology.conf file. TopologyPlugin=topology/tree is required.

The interpretation of this parameter varies by SchedulerType. Multiple options may be comma separated.
If set, then job submissions requesting more than configured licenses won't be rejected.

If set and a job cannot start due to association limits, then do not attempt to initiate any lower priority jobs in that partition. Setting this can decrease system throughput and utilization, but avoid potentially starving larger jobs by preventing them from launching indefinitely.

How long, in seconds, the scheduling of batch jobs can be delayed. This can be useful in a high-throughput environment in which batch jobs are submitted at a very high rate (i.e. using the sbatch command) and one wishes to reduce the overhead of attempting to schedule each job at submit time. The default value is 3 seconds.

Number of tasks from a job array that should be available for burst buffer resource allocation. Higher values will increase the system overhead as each task from the job array will be moved to its own job record in memory, so relatively small values are generally recommended. The default value is 10.

When selecting resources for pending jobs to reserve for future execution (i.e. the job can not be started immediately), then preferentially select nodes that are in use. This will tend to leave currently idle resources available for backfilling longer running jobs, but may result in allocations having less than optimal network topology. This option is currently only supported by the select/cons_res and select/cons_tres plugins (or select/cray_aries with SelectTypeParameters set to "OTHER_CONS_RES" or "OTHER_CONS_TRES", which layers the select/cray_aries plugin over the select/cons_res or select/cons_tres plugin respectively).

The backfill scheduler periodically releases locks in order to permit other operations to proceed rather than blocking all activity for what could be an extended period of time. Setting this option will cause the backfill scheduler to continue processing pending jobs from its original job list after releasing locks even if job or node state changes.

Instruct the backfill scheduler to attempt to start a heterogeneous job as soon as all of its components are determined able to do so. Otherwise, the backfill scheduler will delay heterogeneous jobs initiation attempts until after the rest of the queue has been processed. This delay may result in lower priority jobs being allocated resources, which could delay the initiation of the heterogeneous job due to account and/or QOS limits being reached. This option is disabled by default. If enabled and bf_hetjob_prio=min is not set, then it would be automatically set.

At the beginning of each backfill scheduling cycle, a list of pending to be scheduled jobs is sorted according to the precedence order configured in PriorityType. This option instructs the scheduler to alter the sorting algorithm to ensure that all components belonging to the same heterogeneous job will be attempted to be scheduled consecutively (thus not fragmented in the resulting list). More specifically, all components from the same heterogeneous job will be treated as if they all have the same priority (minimum, average or maximum depending upon this option's parameter) when compared with other jobs (or other heterogeneous job components). The original order will be preserved within the same heterogeneous job. Note that the operation is calculated for the PriorityTier layer and for the Priority resulting from the priority/multifactor plugin calculations. When enabled, if any heterogeneous job requested an advanced reservation, then all of that job's components will be treated as if they had requested an advanced reservation (and get preferential treatment in scheduling).

Note that this operation does not update the Priority values of the heterogeneous job components, only their order within the list, so the output of the sprio command will not be effected.

Heterogeneous jobs have special scheduling properties: they are only scheduled by the backfill scheduling plugin, each of their components is considered separately when reserving resources (and might have different PriorityTier or different Priority values), and no heterogeneous job component is actually allocated resources until all if its components can be initiated. This may imply potential scheduling deadlock scenarios because components from different heterogeneous jobs can start reserving resources in an interleaved fashion (not consecutively), but none of the jobs can reserve resources for all components and start. Enabling this option can help to mitigate this problem. By default, this option is disabled.

The number of seconds between backfill iterations. Higher values result in less overhead and better responsiveness. This option applies only to SchedulerType=sched/backfill. Default: 30, Min: 1, Max: 10800 (3h). A setting of -1 will disable the backfill scheduling loop.

The backfill scheduling logic will reserve resources for the specified count of highest priority jobs in each partition. For example, bf_job_part_count_reserve=10 will cause the backfill scheduler to reserve resources for the ten highest priority jobs in each partition. Any lower priority job that can be started using currently available resources and not adversely impact the expected start time of these higher priority jobs will be started by the backfill scheduler The default value is zero, which will reserve resources for any pending job and delay initiation of lower priority jobs. Also see bf_min_age_reserve and bf_min_prio_reserve. Default: 0, Min: 0, Max: 100000.

Require the backfill scheduling logic to track and plan for license availability. By default, any job blocked on license availability will not have resources reserved which can lead to job starvation. This option implicitly enables bf_running_job_reserve.

The maximum number of tasks from a job array for which the backfill scheduler will reserve resources in the future. Since job arrays can potentially have millions of tasks, the overhead in reserving resources for all tasks can be prohibitive. In addition various limits may prevent all the jobs from starting at the expected times. This has no impact upon the number of tasks from a job array that can be started immediately, only those tasks expected to start at some future time. Default: 20, Min: 0, Max: 1000. NOTE: Jobs submitted to multiple partitions appear in the job queue once per partition. If different copies of a single job array record aren't consecutive in the job queue and another job array record is in between, then bf_max_job_array_resv tasks are considered per partition that the job is submitted to.

The maximum number of jobs per user association to attempt starting with the backfill scheduler. This setting is similar to bf_max_job_user but is handy if a user has multiple associations equating to basically different users. One can set this limit to prevent users from flooding the backfill queue with jobs that cannot start and that prevent jobs from other users to start. This option applies only to SchedulerType=sched/backfill. Also see the bf_max_job_user bf_max_job_part, bf_max_job_test and bf_max_job_user_part=# options. Set bf_max_job_test to a value much higher than bf_max_job_assoc. Default: 0 (no limit), Min: 0, Max: bf_max_job_test.

The maximum number of jobs per partition to attempt starting with the backfill scheduler. This can be especially helpful for systems with large numbers of partitions and jobs. This option applies only to SchedulerType=sched/backfill. Also see the partition_job_depth and bf_max_job_test options. Set bf_max_job_test to a value much higher than bf_max_job_part. Default: 0 (no limit), Min: 0, Max: bf_max_job_test.

The maximum number of jobs which can be initiated in a single iteration of the backfill scheduler. This option applies only to SchedulerType=sched/backfill. Default: 0 (no limit), Min: 0, Max: 10000.

The maximum number of jobs to attempt backfill scheduling for (i.e. the queue depth). Higher values result in more overhead and less responsiveness. Until an attempt is made to backfill schedule a job, its expected initiation time value will not be set. In the case of large clusters, configuring a relatively small value may be desirable. This option applies only to SchedulerType=sched/backfill. Default: 500, Min: 1, Max: 1,000,000.

The maximum number of jobs per user to attempt starting with the backfill scheduler for ALL partitions. One can set this limit to prevent users from flooding the backfill queue with jobs that cannot start and that prevent jobs from other users to start. This is similar to the MAXIJOB limit in Maui. This option applies only to SchedulerType=sched/backfill. Also see the bf_max_job_part, bf_max_job_test and bf_max_job_user_part=# options. Set bf_max_job_test to a value much higher than bf_max_job_user. Default: 0 (no limit), Min: 0, Max: bf_max_job_test.

The maximum number of jobs per user per partition to attempt starting with the backfill scheduler for any single partition. This option applies only to SchedulerType=sched/backfill. Also see the bf_max_job_part, bf_max_job_test and bf_max_job_user=# options. Default: 0 (no limit), Min: 0, Max: bf_max_job_test.

The maximum time in seconds the backfill scheduler can spend (including time spent sleeping when locks are released) before discontinuing, even if maximum job counts have not been reached. This option applies only to SchedulerType=sched/backfill. The default value is the value of bf_interval (which defaults to 30 seconds). Default: bf_interval value (def. 30 sec), Min: 1, Max: 3600 (1h). NOTE: If bf_interval is short and bf_max_time is large, this may cause locks to be acquired too frequently and starve out other serviced RPCs. It's advisable if using this parameter to set max_rpc_cnt high enough that scheduling isn't always disabled, and low enough that the interactive workload can get through in a reasonable period of time. max_rpc_cnt needs to be below 256 (the default RPC thread limit). Running around the middle (150) may give you good results. NOTE: When increasing the amount of time spent in the backfill scheduling cycle, Slurm can be prevented from responding to client requests in a timely manner. To address this you can use max_rpc_cnt to specify a number of queued RPCs before the scheduler stops to respond to these requests.

The backfill and main scheduling logic will not reserve resources for pending jobs until they have been pending and runnable for at least the specified number of seconds. In addition, jobs waiting for less than the specified number of seconds will not prevent a newly submitted job from starting immediately, even if the newly submitted job has a lower priority. This can be valuable if jobs lack time limits or all time limits have the same value. The default value is zero, which will reserve resources for any pending job and delay initiation of lower priority jobs. Also see bf_job_part_count_reserve and bf_min_prio_reserve. Default: 0, Min: 0, Max: 2592000 (30 days).

The backfill and main scheduling logic will not reserve resources for pending jobs unless they have a priority equal to or higher than the specified value. In addition, jobs with a lower priority will not prevent a newly submitted job from starting immediately, even if the newly submitted job has a lower priority. This can be valuable if one wished to maximize system utilization without regard for job priority below a certain threshold. The default value is zero, which will reserve resources for any pending job and delay initiation of lower priority jobs. Also see bf_job_part_count_reserve and bf_min_age_reserve. Default: 0, Min: 0, Max: 2^63.

Size of backfill node_space table. Adding a single job to backfill reservations in the worst case can consume two node_space records. In the case of large clusters, configuring a relatively small value may be desirable. This option applies only to SchedulerType=sched/backfill. Also see bf_max_job_test and bf_running_job_reserve. Default: bf_max_job_test, Min: 2, Max: 2,000,000.

Disallow adding more than one backfill reservation per job. The scheduling logic builds a sorted list of job-partition pairs. Jobs submitted to multiple partitions have as many entries in the list as requested partitions. By default, the backfill scheduler may evaluate all the job-partition entries for a single job, potentially reserving resources for each pair, but only starting the job in the reservation offering the earliest start time. Having a single job reserving resources for multiple partitions could impede other jobs (or hetjob components) from reserving resources already reserved for the partitions that don't offer the earliest start time. A single job that requests multiple partitions can also prevent itself from starting earlier in a lower priority partition if the partitions overlap nodes and a backfill reservation in the higher priority partition blocks nodes that are also in the lower priority partition. This option makes it so that a job submitted to multiple partitions will stop reserving resources once the first job-partition pair has booked a backfill reservation. Subsequent pairs from the same job will only be tested to start now. This allows for other jobs to be able to book the other pairs resources at the cost of not guaranteeing that the multi partition job will start in the partition offering the earliest start time (unless it can start immediately). This option is disabled by default.

The number of seconds in the resolution of data maintained about when jobs begin and end. Higher values result in better responsiveness and quicker backfill cycles by using larger blocks of time to determine node eligibility. However, higher values lead to less efficient system planning, and may miss opportunities to improve system utilization. This option applies only to SchedulerType=sched/backfill. Default: 60, Min: 1, Max: 3600 (1 hour).

Add an extra step to backfill logic, which creates backfill reservations for jobs running on whole nodes. This option is disabled by default.

The number of minutes into the future to look when considering jobs to schedule. Higher values result in more overhead and less responsiveness. A value at least as long as the highest allowed time limit is generally advisable to prevent job starvation. In order to limit the amount of data managed by the backfill scheduler, if the value of bf_window is increased, then it is generally advisable to also increase bf_resolution. This option applies only to SchedulerType=sched/backfill. Default: 1440 (1 day), Min: 1, Max: 43200 (30 days).

For performance reasons, the backfill scheduler will decrease precision in calculation of job expected termination times. By default, the precision starts at 30 seconds and that time interval doubles with each evaluation of currently executing jobs when trying to determine when a pending job can start. This algorithm can support an environment with many thousands of running jobs, but can result in the expected start time of pending jobs being gradually being deferred due to lack of precision. A value for bf_window_linear will cause the time interval to be increased by a constant amount on each iteration. The value is specified in units of seconds. For example, a value of 60 will cause the backfill scheduler on the first iteration to identify the job ending soonest and determine if the pending job can be started after that job plus all other jobs expected to end within 30 seconds (default initial value) of the first job. On the next iteration, the pending job will be evaluated for starting after the next job expected to end plus all jobs ending within 90 seconds of that time (30 second default, plus the 60 second option value). The third iteration will have a 150 second window and the fourth 210 seconds. Without this option, the time windows will double on each iteration and thus be 30, 60, 120, 240 seconds, etc. The use of bf_window_linear is not recommended with more than a few hundred simultaneously executing jobs.

The backfill scheduler will periodically relinquish locks in order for other pending operations to take place. This specifies the times when the locks are relinquished in microseconds. Smaller values may be helpful for high throughput computing when used in conjunction with the bf_continue option. Also see the bf_yield_sleep option. Default: 2,000,000 (2 sec), Min: 1, Max: 10,000,000 (10 sec).

The backfill scheduler will periodically relinquish locks in order for other pending operations to take place. This specifies the length of time for which the locks are relinquished in microseconds. Also see the bf_yield_interval option. Default: 500,000 (0.5 sec), Min: 1, Max: 10,000,000 (10 sec).

Defines the maximum time that can be devoted to building a queue of jobs to be tested for scheduling. If the system has a huge number of jobs with dependencies, just building the job queue can take so much time as to adversely impact overall system performance and this parameter can be adjusted as needed. The default value is 2,000,000 microseconds (2 seconds).

Defines the number of array tasks that get split for potential aftercorr dependency check. Low number may result in dependent task check failures when the job one depends on gets purged before the split. Default: 10.

The default number of jobs to attempt scheduling (i.e. the queue depth) when a running job completes or other routine actions occur, however the frequency with which the scheduler is run may be limited by using the defer or sched_min_interval parameters described below. The full queue will be tested on a less frequent basis as defined by the sched_interval option described below. The default value is 100. See the partition_job_depth option to limit depth by partition.

Setting this option will avoid attempting to schedule each job individually at job submit time, but defer it until a later time when scheduling multiple jobs simultaneously may be possible. This option may improve system responsiveness when large numbers of jobs (many hundreds) are submitted at the same time, but it will delay the initiation time of individual jobs. Also see default_queue_depth above.

Do not reboot nodes in order to satisfied this job's feature specification if the job has been eligible to run for less than this time period. If the job has waited for less than the specified period, it will use only nodes which already have the specified features. The argument is in units of minutes. Individual jobs may override this default value with the --delay-boot option.

Deny user requests to shrink the size of running jobs. (However, running jobs may still shrink due to node failure if the --no-kill option was set.)

Disable job steps that span heterogeneous job allocations.

Enable job steps that span heterogeneous job allocations. The default value.

Enable use of the "scontrol top" command by non-privileged users.

Some processors (e.g. AMD Opteron 6000 series) contain multiple NUMA nodes per socket. This is a configuration which does not map into the hardware entities that Slurm optimizes resource allocation for (PU/thread, core, socket, baseboard, node and network switch). In order to optimize resource allocations on such hardware, Slurm will consider each NUMA node within the socket as a separate socket by default. Use the Ignore_NUMA option to report the correct socket count, but not optimize resource allocations on the NUMA nodes.

NOTE: Since hwloc 2.0 NUMA Nodes are are not part of the main/CPU topology tree, because of that if Slurm is build with hwloc 2.0 or above Slurm will treat HWLOC_OBJ_PACKAGE as Socket, you can change this behavior using SlurmdParameters=l3cache_as_socket.

If set, and a job requests --prefer any features in the request that would create an invalid request with the current system will not generate an error. This is helpful for dynamic systems where nodes with features come and go. Please note using this option will not protect you from typos.

Specify the maximum number of tasks that can be included in a job array. The default limit is MaxArraySize, but this option can be used to set a lower limit. For example, max_array_tasks=1000 and MaxArraySize=100001 would permit a maximum task ID of 100000, but limit the number of tasks in any single job array to 1000.

If the number of active threads in the slurmctld daemon is equal to or larger than this value, defer scheduling of jobs. The scheduler will check this condition at certain points in code and yield locks if necessary. This can improve Slurm's ability to process requests at a cost of initiating new jobs less frequently. Default: 0 (option disabled), Min: 0, Max: 1000.
NOTE: The maximum number of threads (MAX_SERVER_THREADS) is internally set to 256 and defines the number of served RPCs at a given time. Setting max_rpc_cnt to more than 256 will be only useful to let backfill continue scheduling work after locks have been yielded (i.e. each 2 seconds) if there are a maximum of MAX(max_rpc_cnt/10, 20) RPCs in the queue. i.e. max_rpc_cnt=1000, the scheduler will be allowed to continue after yielding locks only when there are less than or equal to 100 pending RPCs. If a value is set, then a value of 10 or higher is recommended. It may require some tuning for each system, but needs to be high enough that scheduling isn't always disabled, and low enough that requests can get through in a reasonable period of time.

How long, in seconds, that the main scheduling loop will execute for before exiting. If a value is configured, be aware that all other Slurm operations will be deferred during this time period. Make certain the value is lower than MessageTimeout. If a value is not explicitly configured, the default value is half of MessageTimeout with a minimum default value of 1 second and a maximum default value of 2 seconds. For example if MessageTimeout=10, the time limit will be 2 seconds (i.e. MIN(10/2, 2) = 2).

Specify the maximum size of a batch script, in bytes. The default value is 4 megabytes. Larger values may adversely impact system performance.

Maximum number of seconds that a job can delay execution waiting for the specified desired switch count. The default value is 300 seconds.

If used, the backup controller will not schedule jobs when it takes over. The backup controller will allow jobs to be submitted, modified and cancelled but won't schedule new jobs. This is useful in Cray environments when the backup controller resides on an external Cray node. A restart of slurmctld is required for changes to this parameter to take effect.

If used, any job started on node that fails to load the env from a node will fail instead of using the cached env. This will also implicitly imply the requeue_setup_env_fail option as well.

By default, if the Prolog exits with a non-zero value the job is requeued in a held state. By specifying this parameter the job will be requeued but not held so that the scheduler can dispatch it to another host.

If used with the select/cons_res or select/cons_tres plugin, then put serial jobs at the end of the available nodes rather than using a best fit algorithm. This may reduce resource fragmentation for some workloads.

The default number of jobs to attempt scheduling (i.e. the queue depth) from each partition/queue in Slurm's main scheduling logic. The functionality is similar to that provided by the bf_max_job_part option for the backfill scheduling logic. The default value is 0 (no limit). Job's excluded from attempted scheduling based upon partition will not be counted against the default_queue_depth limit. Also see the bf_max_job_part option.

Specify how many attempts should be made in reordering preemptable jobs to minimize the count of jobs preempted. The default value is 1. High values may adversely impact performance. The logic to support this option is only available in the select/cons_res and select/cons_tres plugins.

If set, then execute extra logic in an attempt to preempt only the lowest priority jobs. It may be desirable to set this configuration parameter when there are multiple priorities of preemptable jobs. The logic to support this option is only available in the select/cons_res and select/cons_tres plugins.

If set, then the preemption sorting algorithm will be changed to sort by the job start times to favor preempting younger jobs over older. (Requires preempt/partition_prio or preempt/qos plugins.)

This option is used to control how scheduling of resources is performed when jobs are in the COMPLETING state, which influences potential fragmentation. If this option is not set then no jobs will be started in any partition when any job is in the COMPLETING state for less than CompleteWait seconds. If this option is set then no jobs will be started in any individual partition that has a job in COMPLETING state for less than CompleteWait seconds. In addition, no jobs will be started in any partition with nodes that overlap with any nodes in the partition of the completing job. This option is to be used in conjunction with CompleteWait.

NOTE: CompleteWait must be set in order for this to work. If CompleteWait=0 then this option does nothing.

NOTE: reduce_completing_frag only affects the main scheduler, not the backfill scheduler.

By default if a job environment setup fails the job keeps running with a limited environment. By specifying this parameter the job will be requeued in held state and the execution node drained.

If defined, the salloc command will wait until all allocated nodes are ready for use (i.e. booted) before the command returns. By default, salloc will return as soon as the resource allocation has been made.

If defined, the sbatch script will wait until all allocated nodes are ready for use (i.e. booted) before the initiation. By default, the sbatch script will be initiated as soon as the first node in the job allocation is ready. The sbatch command can use the --wait-all-nodes option to override this configuration parameter.

How frequently, in seconds, the main scheduling loop will execute and test all pending jobs. The default value is 60 seconds. A setting of -1 will disable the main scheduling loop.

The maximum number of jobs that the main scheduling logic will start in any single execution. The default value is zero, which imposes no limit.

How frequently, in microseconds, the main scheduling loop will execute and test any pending jobs. The scheduler runs in a limited fashion every time that any event happens which could enable a job to start (e.g. job submit, job terminate, etc.). If these events happen at a high frequency, the scheduler can run very frequently and consume significant resources if not throttled by this option. This option specifies the minimum time between the end of one scheduling cycle and the beginning of the next scheduling cycle. A value of zero will disable throttling of the scheduling logic interval. The default value is 2 microseconds.

Specialized cores will be selected from the first cores of the first sockets, cycling through the sockets on a round robin basis. By default, specialized cores will be selected from the last cores of the last sockets, cycling through the sockets on a round robin basis.

When a step completes and there are steps ending resource allocation, then retry step allocations for at least this number of pending steps. Also see step_retry_time. The default value is 8 steps.

When a step completes and there are steps ending resource allocation, then retry step allocations for all steps which have been pending for at least this number of seconds. Also see step_retry_count. The default value is 60 seconds.

Requests to cancel, hold or release any component of a heterogeneous job will be applied to all components of the job.

NOTE: this option was previously named whole_pack and this is still supported for retrocompatibility.

Number of seconds in each time slice when gang scheduling is enabled (PreemptMode=SUSPEND,GANG). The value must be between 5 seconds and 65533 seconds. The default value is 30 seconds.

Identifies the type of scheduler to be used. A restart of slurmctld is required for changes to this parameter to take effect. The scontrol command can be used to manually change job priorities if desired. Acceptable values include:
For a backfill scheduling module to augment the default FIFO scheduling. Backfill scheduling will initiate lower-priority jobs if doing so does not delay the expected initiation time of any higher priority job. Effectiveness of backfill scheduling is dependent upon users specifying job time limits, otherwise all jobs will have the same time limit and backfilling is impossible. Note documentation for the SchedulerParameters option above. This is the default configuration.

This is the FIFO scheduler which initiates jobs in priority order. If any job in the partition can not be scheduled, no lower priority job in that partition will be scheduled. An exception is made for jobs that can not run due to partition constraints (e.g. the time limit) or down/drained nodes. In that case, lower priority jobs can be initiated and not impact the higher priority job.

Multiple options may be comma separated.
Enable the use of scrontab to submit and manage periodic repeating jobs.

Identifies the type of resource selection algorithm to be used. A restart of slurmctld and slurmd is required for changes to this parameter to take effect. When changed, all job information (running and pending) will be lost, since the job state save format used by each plugin is different. The only exception to this is when changing from cons_res to cons_tres or from cons_tres to cons_res. However, if a job contains cons_tres-specific features and then SelectType is changed to cons_res, the job will be canceled, since there is no way for cons_res to satisfy requirements specific to cons_tres.

Acceptable values include

The resources (cores and memory) within a node are individually allocated as consumable resources. Note that whole nodes can be allocated to jobs for selected partitions by using the OverSubscribe=Exclusive option. See the partition OverSubscribe parameter for more information.

The resources (cores, memory, GPUs and all other trackable resources) within a node are individually allocated as consumable resources. Note that whole nodes can be allocated to jobs for selected partitions by using the OverSubscribe=Exclusive option. See the partition OverSubscribe parameter for more information.

for a Cray system. The default value is "select/cray_aries" for all Cray systems.

for allocation of entire nodes assuming a one-dimensional array of nodes in which sequentially ordered nodes are preferable. For a heterogeneous cluster (e.g. different CPU counts on the various nodes), resource allocations will favor nodes with high CPU counts as needed based upon the job's node and CPU specification if TopologyPlugin=topology/none is configured. Use of other topology plugins with select/linear and heterogeneous nodes is not recommended and may result in valid job allocation requests being rejected. The linear plugin is not designed to track generic resources on a node. In cases where generic resources (such as GPUs) need to be tracked, the cons_res or cons_tres plugins should be used instead. This is the default value.

The permitted values of SelectTypeParameters depend upon the configured value of SelectType. The only supported options for SelectType=select/linear are CR_ONE_TASK_PER_CORE and CR_Memory, which treats memory as a consumable resource and prevents memory over subscription with job preemption or gang scheduling. By default SelectType=select/linear allocates whole nodes to jobs without considering their memory consumption. By default SelectType=select/cons_res, SelectType=select/cray_aries, and SelectType=select/cons_tres, use CR_Core_Memory, which allocates Core to jobs with considering their memory consumption.

A restart of slurmctld is required for changes to this parameter to take effect.

The following options are supported for SelectType=select/cray_aries:

Layer the select/cons_res plugin under the select/cray_aries plugin, the default is to layer on select/linear. This also allows all the options available for SelectType=select/cons_res.

Layer the select/cons_tres plugin under the select/cray_aries plugin, the default is to layer on select/linear. This also allows all the options available for SelectType=select/cons_tres.

The following options are supported by the SelectType=select/cons_res and SelectType=select/cons_tres plugins:

CPUs are consumable resources. Configure the number of CPUs on each node, which may be equal to the count of cores or hyper-threads on the node depending upon the desired minimum resource allocation. The node's Boards, Sockets, CoresPerSocket and ThreadsPerCore may optionally be configured and result in job allocations which have improved locality; however doing so will prevent more than one job from being allocated on each core.

CPUs and memory are consumable resources. Configure the number of CPUs on each node, which may be equal to the count of cores or hyper-threads on the node depending upon the desired minimum resource allocation. The node's Boards, Sockets, CoresPerSocket and ThreadsPerCore may optionally be configured and result in job allocations which have improved locality; however doing so will prevent more than one job from being allocated on each core. Setting a value for DefMemPerCPU is strongly recommended.

Cores are consumable resources. On nodes with hyper-threads, each thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated threads on the same core. The count of CPUs allocated to a job is rounded up to account for every CPU on an allocated core. This will also impact total allocated memory when --mem-per-cpu is used to be multiply of total number of CPUs on allocated cores.

Cores and memory are consumable resources. On nodes with hyper-threads, each thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated threads on the same core. The count of CPUs allocated to a job may be rounded up to account for every CPU on an allocated core. Setting a value for DefMemPerCPU is strongly recommended.

Allocate one task per core by default. Without this option, by default one task will be allocated per thread on nodes with more than one ThreadsPerCore configured. NOTE: This option cannot be used with CR_CPU*.

Allocate cores within a node using block distribution by default. This is a pseudo-best-fit algorithm that minimizes the number of boards and minimizes the number of sockets (within minimum boards) used for the allocation. This default behavior can be overridden specifying a particular "-m" parameter with srun/salloc/sbatch. Without this option, cores will be allocated cyclically across the sockets.

Schedule resources to jobs on the least loaded nodes (based upon the number of idle CPUs). This is generally only recommended for an environment with serial jobs as idle resources will tend to be highly fragmented, resulting in parallel jobs being distributed across many nodes. Note that node Weight takes precedence over how many idle resources are on each node. Also see the partition configuration parameter LLN use the least loaded nodes in selected partitions.

If a job allocation contains more resources than will be used for launching tasks (e.g. if whole nodes are allocated to a job), then rather than distributing a job's tasks evenly across its allocated nodes, pack them as tightly as possible on these nodes. For example, consider a job allocation containing two entire nodes with eight CPUs each. If the job starts ten tasks across those two nodes without this option, it will start five tasks on each of the two nodes. With this option, eight tasks will be started on the first node and two tasks on the second node. This can be superseded by "NoPack" in srun's "--distribution" option. CR_Pack_Nodes only applies when the "block" task distribution method is used.

Sockets are consumable resources. On nodes with multiple cores, each core or thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated resources on the same socket.

Memory and sockets are consumable resources. On nodes with multiple cores, each core or thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated resources on the same socket. Setting a value for DefMemPerCPU is strongly recommended.

Memory is a consumable resource. NOTE: This implies OverSubscribe=YES or OverSubscribe=FORCE for all partitions. Setting a value for DefMemPerCPU is strongly recommended.

CR_Core or CR_Socket without _Memory) memory can be oversubscribed. In this case the --mem option is only used to filter out nodes with lower configured memory and does not take running jobs into account. For instance, two jobs requesting all the memory of a node can run at the same time.

An optional address to be used for communications to the currently active slurmctld daemon, normally used with Virtual IP addressing of the currently active server. If this parameter is not specified then each primary and backup server will have its own unique address used for communications as specified in the SlurmctldHost parameter. If this parameter is specified then the SlurmctldHost parameter will still be used for communications to specific slurmctld primary or backup servers, for example to cause all of them to read the current configuration files or shutdown. Also see the SlurmctldPrimaryOffProg and SlurmctldPrimaryOnProg configuration parameters to configure programs to manipulate virtual IP address manipulation.

The level of detail to provide slurmctld daemon's logs. The default value is info. If the slurmctld daemon is initiated with -v or --verbose options, that debug level will be preserve or restored upon reconfiguration.
Log nothing

Log only fatal errors

Log only errors

Log errors and general informational messages

Log errors and verbose informational messages

Log errors and verbose informational messages and debugging messages

Log errors and verbose informational messages and more debugging messages

Log errors and verbose informational messages and even more debugging messages

Log errors and verbose informational messages and even more debugging messages

Log errors and verbose informational messages and even more debugging messages

The short, or long, hostname of the machine where Slurm control daemon is executed (i.e. the name returned by the command "hostname -s"). This hostname is optionally followed by the address, either the IP address or a name by which the address can be identified, enclosed in parentheses (e.g. SlurmctldHost=slurmctl-primary(12.34.56.78)). This value must be specified at least once. If specified more than once, the first hostname named will be where the daemon runs. If the first specified host fails, the daemon will execute on the second host. If both the first and second specified host fails, the daemon will execute on the third host. A restart of slurmctld is required for changes to this parameter to take effect.

Fully qualified pathname of a file into which the slurmctld daemon's logs are written. The default value is none (performs logging via syslog).
See the section LOGGING if a pathname is specified.

Multiple options may be comma separated.
Permit setting triggers from non-root/slurm_user users. SlurmUser must also be set to root to permit these triggers to work. See the strigger man page for additional details.

By default, Slurm expects that the network address for a cloud node won't be known until the creation of the node and that Slurm will be notified of the node's address (e.g. scontrol update nodename=<name> nodeaddr=<addr>). Since Slurm communications rely on the node configuration found in the slurm.conf, Slurm will tell the client command, after waiting for all nodes to boot, each node's ip address. However, in environments where the nodes are in DNS, this step can be avoided by configuring this option.

When a cloud node registers, the node's NodeAddr and NodeHostName will automatically be set. They will be reset back to the nodename after powering off.

Permit "configless" operation by the slurmd, slurmstepd, and user commands. When enabled the slurmd will be permitted to retrieve config files from the slurmctld, and on any 'scontrol reconfigure' command new configs will be automatically pushed out and applied to nodes that are running in this "configless" mode. A restart of slurmctld is required for changes to this parameter to take effect. NOTE: Included files with the Include directive will only be pushed if the filename has no path separators and is located adjacent to slurm.conf.

Mark nodes as idle, regardless of current state, when suspending nodes with SuspendProgram so that nodes will be eligible to be resumed at a later time.

Percentage of memory a node is allowed to register with without being marked as invalid with low memory. Default is 100. For State=CLOUD nodes, the default is 90. To disable this for cloud nodes set it to 100. config_overrides takes precedence over this option.

It's recommended that task/cgroup with ConstrainRamSpace is configured. A memory cgroup limit won't be set more than the actual memory on the node. If needed, configure AllowedRamSpace in the cgroup.conf to add a buffer.

How often the power_save thread looks to resume and suspend nodes. The power_save thread will do work sooner if there are node state changes. Default is 10 seconds.

How often the power_save thread, at a minimum, looks to resume and suspend nodes. Default is 0.

Action used once MaxDBDMsgs is reached, options are 'discard' (default) and 'exit'.

When 'discard' is specified and MaxDBDMsgs is reached we start by purging pending messages of types Step start and complete, and it reaches MaxDBDMsgs again Job start messages are purged. Job completes and node state changes continue to consume the empty space created from the purgings until MaxDBDMsgs is reached again at which no new message is tracked creating data loss and potentially runaway jobs.

When 'exit' is specified and MaxDBDMsgs is reached the slurmctld will exit instead of discarding any messages. It will be impossible to start the slurmctld with this option where the slurmdbd is down and the slurmctld is tracking more than MaxDBDMsgs.

Send the user signal (e.g. --signal=<sig_num>) at preemption time even if the signal time hasn't been reached. In the case of a gracetime preemption the user signal will be sent if the user signal has been specified and not sent, otherwise a SIGTERM will be sent to the tasks.

Run the RebootProgram from the controller instead of on the slurmds. The RebootProgram will be passed a comma-separated list of nodes to reboot as the first argument and if applicable the required features needed for reboot as the second argument.

Allow any user able to run in a reservation to delete it.

Fully qualified pathname of a file into which the slurmctld daemon may write its process id. This may be used for automated signal processing. The default value is "/var/run/slurmctld.pid".

A comma-delimited list of Slurm controller plugins to be started when the daemon begins and terminated when it ends. Only the plugin's init and fini functions are called.

The port number that the Slurm controller, slurmctld, listens to for work. The default value is SLURMCTLD_PORT as established at system build time. If none is explicitly specified, it will be set to 6817. SlurmctldPort may also be configured to support a range of port numbers in order to accept larger bursts of incoming messages by specifying two numbers separated by a dash (e.g. SlurmctldPort=6817-6818). A restart of slurmctld is required for changes to this parameter to take effect. NOTE: Either slurmctld and slurmd daemons must not execute on the same nodes or the values of SlurmctldPort and SlurmdPort must be different.

Note: On Cray systems, Realm-Specific IP Addressing (RSIP) will automatically try to interact with anything opened on ports 8192-60000. Configure SlurmctldPort to use a port outside of the configured SrunPortRange and RSIP's port range.

This program is executed when a slurmctld daemon running as the primary server becomes a backup server. By default no program is executed. See also the related "SlurmctldPrimaryOnProg" parameter.

This program is executed when a slurmctld daemon running as a backup server becomes the primary server. By default no program is executed. When using virtual IP addresses to manage High Available Slurm services, this program can be used to add the IP address to an interface (and optionally try to kill the unresponsive slurmctld daemon and flush the ARP caches on nodes on the local Ethernet fabric). See also the related "SlurmctldPrimaryOffProg" parameter.

The slurmctld daemon will log events to the syslog file at the specified level of detail. If not set, the slurmctld daemon will log to syslog at level fatal, unless there is no SlurmctldLogFile and it is running in the background, in which case it will log to syslog at the level specified by SlurmctldDebug (at fatal in the case that SlurmctldDebug is set to quiet) or it is run in the foreground, when it will be set to quiet.
Log nothing

Log only fatal errors

Log only errors

Log errors and general informational messages

Log errors and verbose informational messages

Log errors and verbose informational messages and debugging messages

Log errors and verbose informational messages and more debugging messages

Log errors and verbose informational messages and even more debugging messages

Log errors and verbose informational messages and even more debugging messages

Log errors and verbose informational messages and even more debugging messages
NOTE: By default, Slurm's systemd service files start daemons in the foreground with the -D option. This means that systemd will capture stdout/stderr output and print that to syslog, independent of Slurm printing to syslog directly. To prevent systemd from doing this, add "StandardOutput=null" and "StandardError=null" to the respective service files or override files.

The interval, in seconds, that the backup controller waits for the primary controller to respond before assuming control. The default value is 120 seconds. May not exceed 65533.

The level of detail to provide slurmd daemon's logs. The default value is info.
Log nothing

Log only fatal errors

Log only errors

Log errors and general informational messages

Log errors and verbose informational messages

Log errors and verbose informational messages and debugging messages

Log errors and verbose informational messages and more debugging messages

Log errors and verbose informational messages and even more debugging messages

Log errors and verbose informational messages and even more debugging messages

Log errors and verbose informational messages and even more debugging messages

Fully qualified pathname of a file into which the slurmd daemon's logs are written. The default value is none (performs logging via syslog). The first "%h" within the name is replaced with the hostname on which the slurmd is running. The first "%n" within the name is replaced with the Slurm node name on which the slurmd is running.
See the section LOGGING if a pathname is specified.

Parameters specific to the Slurmd. Multiple options may be comma separated.
If set, consider the configuration of each node to be that specified in the slurm.conf configuration file and any node with less than the configured resources will not be set to INVAL/INVALID_REG. This option is generally only useful for testing purposes. Equivalent to the now deprecated FastSchedule=2 option.

Use the hwloc l3cache as the socket count. Can be useful on certain processors where the socket level is too coarse, and the l3cache may provide better task distribution. (E.g., along CCX boundaries instead of socket boundaries.) Mutually exclusive with numa_node_as_socket. Requires hwloc v2.
Use the hwloc NUMA Node to determine main hierarchy object to be used as socket. If the option is set Slurm will check the parent object of NUMA Noda and use it as socket. This option may be useful for architectures likes AMD Epyc, where number of nodes per socket may be configured. Mutually exclusive with l3cache_as_socket. Requires hwloc v2.

If set, the Slurmd will shut itself down when a reboot request is received.

Fully qualified pathname of a file into which the slurmd daemon may write its process id. This may be used for automated signal processing. The first "%h" within the name is replaced with the hostname on which the slurmd is running. The first "%n" within the name is replaced with the Slurm node name on which the slurmd is running. The default value is "/var/run/slurmd.pid".

The port number that the Slurm compute node daemon, slurmd, listens to for work. The default value is SLURMD_PORT as established at system build time. If none is explicitly specified, its value will be 6818. A restart of slurmctld is required for changes to this parameter to take effect. NOTE: Either slurmctld and slurmd daemons must not execute on the same nodes or the values of SlurmctldPort and SlurmdPort must be different.

Note: On Cray systems, Realm-Specific IP Addressing (RSIP) will automatically try to interact with anything opened on ports 8192-60000. Configure SlurmdPort to use a port outside of the configured SrunPortRange and RSIP's port range.

Fully qualified pathname of a directory into which the slurmd daemon's state information and batch job script information are written. This must be a common pathname for all nodes, but should represent a directory which is local to each node (reference a local file system). The default value is "/var/spool/slurmd". The first "%h" within the name is replaced with the hostname on which the slurmd is running. The first "%n" within the name is replaced with the Slurm node name on which the slurmd is running.

The slurmd daemon will log events to the syslog file at the specified level of detail. If not set, the slurmd daemon will log to syslog at level fatal, unless there is no SlurmdLogFile and it is running in the background, in which case it will log to syslog at the level specified by SlurmdDebug (at fatal in the case that SlurmdDebug is set to quiet) or it is run in the foreground, when it will be set to quiet.
Log nothing

Log only fatal errors

Log only errors

Log errors and general informational messages

Log errors and verbose informational messages

Log errors and verbose informational messages and debugging messages

Log errors and verbose informational messages and more debugging messages

Log errors and verbose informational messages and even more debugging messages

Log errors and verbose informational messages and even more debugging messages

Log errors and verbose informational messages and even more debugging messages
NOTE: By default, Slurm's systemd service files start daemons in the foreground with the -D option. This means that systemd will capture stdout/stderr output and print that to syslog, independent of Slurm printing to syslog directly. To prevent systemd from doing this, add "StandardOutput=null" and "StandardError=null" to the respective service files or override files.

The interval, in seconds, that the Slurm controller waits for slurmd to respond before configuring that node's state to DOWN. A value of zero indicates the node will not be tested by slurmctld to confirm the state of slurmd, the node will not be automatically set to a DOWN state indicating a non-responsive slurmd, and some other tool will take responsibility for monitoring the state of each compute node and its slurmd daemon. Slurm's hierarchical communication mechanism is used to ping the slurmd daemons in order to minimize system noise and overhead. The default value is 300 seconds. The value may not exceed 65533 seconds.

The name of the user that the slurmd daemon executes as. This user must exist on all nodes of the cluster for authentication of communications between Slurm components. The default value is "root".

Fully qualified pathname of the scheduling event logging file. The syntax of this parameter is the same as for SlurmctldLogFile. In order to configure scheduler logging, set both the SlurmSchedLogFile and SlurmSchedLogLevel parameters.

The initial level of scheduling event logging, similar to the SlurmctldDebug parameter used to control the initial level of slurmctld logging. Valid values for SlurmSchedLogLevel are "0" (scheduler logging disabled) and "1" (scheduler logging enabled). If this parameter is omitted, the value defaults to "0" (disabled). In order to configure scheduler logging, set both the SlurmSchedLogFile and SlurmSchedLogLevel parameters. The scheduler logging level can be changed dynamically using scontrol.

The name of the user that the slurmctld daemon executes as. For security purposes, a user other than "root" is recommended. This user must exist on all nodes of the cluster for authentication of communications between Slurm components. The default value is "root".

Fully qualified pathname of an executable to be run by srun following the completion of a job step. The command line arguments for the executable will be the command and arguments of the job step. This configuration parameter may be overridden by srun's --epilog parameter. Note that while the other "Epilog" executables (e.g., TaskEpilog) are run by slurmd on the compute nodes where the tasks are executed, the SrunEpilog runs on the node where the "srun" is executing.

The srun creates a set of listening ports to communicate with the controller, the slurmstepd and to handle the application I/O. By default these ports are ephemeral meaning the port numbers are selected by the kernel. Using this parameter allow sites to configure a range of ports from which srun ports will be selected. This is useful if sites want to allow only certain port range on their network.

Note: On Cray systems, Realm-Specific IP Addressing (RSIP) will automatically try to interact with anything opened on ports 8192-60000. Configure SrunPortRange to use a range of ports above those used by RSIP, ideally 1000 or more ports, for example "SrunPortRange=60001-63000".

Note: SrunPortRange must be large enough to cover the expected number of srun ports created on a given submission node. A single srun opens 3 listening ports plus 2 more for every 48 hosts. Example:

Fully qualified pathname of an executable to be run by srun prior to the launch of a job step. The command line arguments for the executable will be the command and arguments of the job step. This configuration parameter may be overridden by srun's --prolog parameter. Note that while the other "Prolog" executables (e.g., TaskProlog) are run by slurmd on the compute nodes where the tasks are executed, the SrunProlog runs on the node where the "srun" is executing.

Fully qualified pathname of a directory into which the Slurm controller, slurmctld, saves its state (e.g. "/usr/local/slurm/checkpoint"). Slurm state will saved here to recover from system failures. SlurmUser must be able to create files in this directory. If you have a secondary SlurmctldHost configured, this location should be readable and writable by both systems. Since all running and pending job information is stored here, the use of a reliable file system (e.g. RAID) is recommended. The default value is "/var/spool". A restart of slurmctld is required for changes to this parameter to take effect. If any slurm daemons terminate abnormally, their core files will also be written into this directory.

Specifies the nodes which are to not be placed in power save mode, even if the node remains idle for an extended period of time. Use Slurm's hostlist expression to identify nodes with an optional ":" separator and count of nodes to exclude from the preceding range. For example "nid[10-20]:4" will prevent 4 usable nodes (i.e IDLE and not DOWN, DRAINING or already powered down) in the set "nid[10-20]" from being powered down. Multiple sets of nodes can be specified with or without counts in a comma separated list (e.g "nid[10-20]:4,nid[80-90]:2"). If a node count specification is given, any list of nodes to NOT have a node count must be after the last specification with a count. For example "nid[10-20]:4,nid[60-70]" will exclude 4 nodes in the set "nid[10-20]:4" plus all nodes in the set "nid[60-70]" while "nid[1-3],nid[10-20]:4" will exclude 4 nodes from the set "nid[1-3],nid[10-20]". By default no nodes are excluded.

Specifies the partitions whose nodes are to not be placed in power save mode, even if the node remains idle for an extended period of time. Multiple partitions can be identified and separated by commas. By default no nodes are excluded.

SuspendProgram is the program that will be executed when a node remains idle for an extended period of time. This program is expected to place the node into some power save mode. This can be used to reduce the frequency and voltage of a node or completely power the node off. The program executes as SlurmUser. The argument to the program will be the names of nodes to be placed into power savings mode (using Slurm's hostlist expression format). By default, no program is run.

The rate at which nodes are placed into power save mode by SuspendProgram. The value is number of nodes per minute and it can be used to prevent a large drop in power consumption (e.g. after a large job completes). A value of zero results in no limits being imposed. The default value is 60 nodes per minute.

Nodes which remain idle or down for this number of seconds will be placed into power save mode by SuspendProgram. Setting SuspendTime to anything but INFINITE (or -1) will enable power save mode. INFINITE is the default.

Maximum time permitted (in seconds) between when a node suspend request is issued and when the node is shutdown. At that time the node must be ready for a resume request to be issued as needed for new work. The default value is 30 seconds.

Optional parameters for the switch plugin.

On HPE Slingshot systems configured with SwitchType=switch/hpe_slingshot, the following parameters are supported (separate multiple parameters with a comma):

Range of VNIs to allocate for jobs and applications. This parameter is required.

Set of traffic classes to configure for applications. Supported traffic classes are DEDICATED_ACCESS, LOW_LATENCY, BULK_DATA, and BEST_EFFORT.

Allocate a VNI for single node job steps.

Allocate an additional VNI for jobs, shared among all job steps.

Per-CPU reserved allocation for this resource.

Per-node reserved allocation for this resource. If set, overrides the per-CPU allocation.

Maximum per-node application for this resource.

The resources that may be configured are:

Transmit command queues. The default is 3 per-CPU, maximum 1024 per-node.

Target command queues. The default is 2 per-CPU, maximum 512 per-node.

Event queues. The default is 8 per-CPU, maximum 2048 per-node.

Counters. The default is 2 per-CPU, maximum 2048 per-node.

Trigger list entries. The default is 1 per-CPU, maximum 2048 per-node.

Portable table entries. The default is 8 per-CPU, maximum 2048 per-node.

List entries. The default is 134 per-CPU, maximum 65535 per-node.

Addressing contexts. The default is 4 per-CPU, maximum 1024 per-node.

Identifies the type of switch or interconnect used for application communications. Acceptable values include "switch/cray_aries" for Cray systems, "switch/hpe_slingshot" for HPE Slingshot systems and "switch/none" for switches not requiring special processing for job launch or termination (Ethernet, and InfiniBand). The default value is "switch/none". All Slurm daemons, commands and running jobs must be restarted for a change in SwitchType to take effect. If running jobs exist at the time slurmctld is restarted with a new value of SwitchType, records of all jobs in any state may be lost.

Fully qualified pathname of a program to be executed as the slurm job's owner after termination of each task. See TaskProlog for execution order details.

Identifies the type of task launch plugin, typically used to provide resource management within a node (e.g. pinning tasks to specific processors). More than one task plugin can be specified in a comma-separated list. The prefix of "task/" is optional. Acceptable values include:
enables resource containment using sched_setaffinity(). This enables the --cpu-bind and/or --mem-bind srun options.

enables resource containment using Linux control cgroups. This enables the --cpu-bind and/or --mem-bind srun options. NOTE: see "man cgroup.conf" for configuration details.

for systems requiring no special handling of user tasks. Lacks support for the --cpu-bind and/or --mem-bind srun options. The default value is "task/none".

NOTE: It is recommended to stack task/affinity,task/cgroup together when configuring TaskPlugin, and setting ConstrainCores=yes in cgroup.conf. This setup uses the task/affinity plugin for setting the affinity of the tasks and uses the task/cgroup plugin to fence tasks into the specified resources.

NOTE: For CRAY systems only: task/cgroup must be used with, and listed after task/cray_aries in TaskPlugin. The task/affinity plugin can be listed anywhere, but the previous constraint must be satisfied. For CRAY systems, a configuration like this is recommended:

TaskPlugin=task/affinity,task/cray_aries,task/cgroup

Optional parameters for the task plugin. Multiple options should be comma separated. None, Sockets, Cores and Threads are mutually exclusive and treated as a last possible source of --cpu-bind default. See also Node and Partition CpuBind options.
Bind tasks to cores by default. Overrides automatic binding.

Perform no task binding by default. Overrides automatic binding.

Bind to sockets by default. Overrides automatic binding.

Bind to threads by default. Overrides automatic binding.

If specialized cores or CPUs are identified for the node (i.e. the CoreSpecCount or CpuSpecList are configured for the node), then Slurm daemons running on the compute node (i.e. slurmd and slurmstepd) should run outside of those resources (i.e. specialized resources are completely unavailable to Slurm daemons and jobs spawned by Slurm). This option may not be used with the task/cray_aries plugin.

Verbosely report binding before tasks run by default.

Set a default binding in the event that "auto binding" doesn't find a match. Set to Threads, Cores or Sockets (E.g. TaskPluginParam=autobind=threads).

Fully qualified pathname of a program to be executed as the slurm job's owner prior to initiation of each task. Besides the normal environment variables, this has SLURM_TASK_PID available to identify the process ID of the task being started. Standard output from this program can be used to control the environment variables and output for the user program.
Will set environment variables for the task being spawned. Everything after the equal sign to the end of the line will be used as the value for the environment variable. Exporting of functions is not currently supported.

Will cause that line (without the leading "print ") to be printed to the job's standard output.

Will clear environment variables for the task being spawned.

1. pre_launch_priv()
Function in TaskPlugin

1. pre_launch()
Function in TaskPlugin

2. TaskProlog
System-wide per task program defined in slurm.conf

3. User prolog
Job-step-specific task program defined using srun's --task-prolog option or SLURM_TASK_PROLOG environment variable

4. Task
Execute the job step's task

5. User epilog
Job-step-specific task program defined using srun's --task-epilog option or SLURM_TASK_EPILOG environment variable

6. TaskEpilog
System-wide per task program defined in slurm.conf

7. post_term()
Function in TaskPlugin

Time permitted for TCP connection to be established. Default value is 2 seconds.

Fully qualified pathname of the file system available to user jobs for temporary storage. This parameter is used in establishing a node's TmpDisk space. The default value is "/tmp".

Comma-separated options identifying network topology options.
Optimize allocation for Dragonfly network. Valid when TopologyPlugin=topology/tree.

Only optimize allocation for network topology if the job includes a switch option. Since optimizing resource allocation for topology involves much higher system overhead, this option can be used to impose the extra overhead only on jobs which can take advantage of it. If most job allocations are not optimized for network topology, they may fragment resources to the point that topology optimization for other jobs will be difficult to achieve. NOTE: Jobs may span across nodes without common parent switches with this enabled.

Identifies the plugin to be used for determining the network topology and optimizing job allocations to minimize network contention. See NETWORK TOPOLOGY below for details. Additional plugins may be provided in the future which gather topology information directly from the network. Acceptable values include:
best-fit logic over three-dimensional topology

default for other systems, best-fit logic over one-dimensional topology

used for a hierarchical network as described in a topology.conf file

Boolean yes or no. Used to set display and track of the Workload Characterization Key. Must be set to track correct wckey usage. NOTE: You must also set TrackWCKey in your slurmdbd.conf file to create historical usage reports.

Slurmd daemons use a virtual tree network for communications. TreeWidth specifies the width of the tree (i.e. the fanout). On architectures with a front end node running the slurmd daemon, the value must always be equal to or greater than the number of front end nodes which eliminates the need for message forwarding between the slurmd daemons. On other architectures the default value is 50, meaning each slurmd daemon can communicate with up to 50 other slurmd daemons and over 2500 nodes can be contacted with two message hops. The default value will work well for most clusters. Optimal system performance can typically be achieved if TreeWidth is set to the square root of the number of nodes in the cluster for systems having no more than 2500 nodes or the cube root for larger systems. The value may not exceed 65533.

If the processes in a job step are determined to be unkillable for a period of time specified by the UnkillableStepTimeout variable, the program specified by UnkillableStepProgram will be executed. By default no program is run.

See section UNKILLABLE STEP PROGRAM SCRIPT for more information.

The length of time, in seconds, that Slurm will wait before deciding that processes in a job step are unkillable (after they have been signaled with SIGKILL) and execute UnkillableStepProgram. The default timeout value is 60 seconds. If exceeded, the compute node will be drained to prevent future jobs from being scheduled on the node.

If set to 1, PAM (Pluggable Authentication Modules for Linux) will be enabled. PAM is used to establish the upper bounds for resource limits. With PAM support enabled, local system administrators can dynamically configure system resource limits. Changing the upper bound of a resource limit will not alter the limits of running jobs, only jobs started after a change has been made will pick up the new limits. The default value is 0 (not to enable PAM support). Remember that PAM also needs to be configured to support Slurm as a service. For sites using PAM's directory based configuration option, a configuration file named slurm should be created. The module-type, control-flags, and module-path names that should be included in the file are:
auth required pam_localuser.so
auth required pam_shells.so
account required pam_unix.so
account required pam_access.so
session required pam_unix.so
For sites configuring PAM with a general configuration file, the appropriate lines (see above), where slurm is the service-name, should be added.

NOTE: UsePAM option has nothing to do with the contribs/pam/pam_slurm and/or contribs/pam_slurm_adopt modules. So these two modules can work independently of the value set for UsePAM.

Memory specifications in job requests apply to real memory size (also known as resident set size). It is possible to enforce virtual memory limits for both jobs and job steps by limiting their virtual memory to some percentage of their real memory allocation. The VSizeFactor parameter specifies the job's or job step's virtual memory limit as a percentage of its real memory limit. For example, if a job's real memory limit is 500MB and VSizeFactor is set to 101 then the job will be killed if its real memory exceeds 500MB or its virtual memory exceeds 505MB (101 percent of the real memory limit). The default value is 0, which disables enforcement of virtual memory limits. The value may not exceed 65533 percent.

NOTE: This parameter is dependent on OverMemoryKill being configured in JobAcctGatherParams. It is also possible to configure the TaskPlugin to use task/cgroup for memory enforcement. VSizeFactor will not have an effect on memory enforcement done through cgroups.

Specifies how many seconds the srun command should by default wait after the first task terminates before terminating all remaining tasks. The "--wait" option on the srun command line overrides this value. The default value is 0, which disables this feature. May not exceed 65533 seconds.

For use with Slurm's built-in X11 forwarding implementation.
If set, xauth data on the compute node will be placed in ~/.Xauthority rather than in a temporary file under TmpFS.

The configuration of nodes (or machines) to be managed by Slurm is also specified in /etc/slurm.conf. Changes in node configuration (e.g. adding nodes, changing their processor count, etc.) require restarting both the slurmctld daemon and the slurmd daemons. All slurmd daemons must know each node in the system to forward messages in support of hierarchical communications. Only the NodeName must be supplied in the configuration file. All other node configuration information is optional. It is advisable to establish baseline node configurations, especially if the cluster is heterogeneous. Nodes which register to the system with less than the configured resources (e.g. too little memory), will be placed in the "DOWN" state to avoid scheduling jobs on them. Establishing baseline configurations will also speed Slurm's scheduling process by permitting it to compare job requirements against these (relatively few) configuration parameters and possibly avoid having to check job requirements against every individual node's configuration. The resources checked at node registration time are: CPUs, RealMemory and TmpDisk.

Default values can be specified with a record in which NodeName is "DEFAULT". The default entry values will apply only to lines following it in the configuration file and the default values can be reset multiple times in the configuration file with multiple entries where "NodeName=DEFAULT". Each line where NodeName is "DEFAULT" will replace or add to previous default values and will not reinitialize the default values. The "NodeName=" specification must be placed on every line describing the configuration of nodes. A single node name can not appear as a NodeName value in more than one line (duplicate node name records will be ignored). In fact, it is generally possible and desirable to define the configurations of all nodes in only a few lines. This convention permits significant optimization in the scheduling of larger clusters. In order to support the concept of jobs requiring consecutive nodes on some architectures, node specifications should be place in this file in consecutive order. No single node name may be listed more than once in the configuration file. Use "DownNodes=" to record the state of nodes which are temporarily in a DOWN, DRAIN or FAILING state without altering permanent configuration information. A job step's tasks are allocated to nodes in order the nodes appear in the configuration file. There is presently no capability within Slurm to arbitrarily order a job step's tasks.

Multiple node names may be comma separated (e.g. "alpha,beta,gamma") and/or a simple node range expression may optionally be used to specify numeric ranges of nodes to avoid building a configuration file with large numbers of entries. The node range expression can contain one pair of square brackets with a sequence of comma-separated numbers and/or ranges of numbers separated by a "-" (e.g. "linux[0-64,128]", or "lx[15,18,32-33]"). Note that the numeric ranges can include one or more leading zeros to indicate the numeric portion has a fixed number of digits (e.g. "linux[0000-1023]"). Multiple numeric ranges can be included in the expression (e.g. "rack[0-63]_blade[0-41]"). If one or more numeric expressions are included, one of them must be at the end of the name (e.g. "unit[0-31]rack" is invalid), but arbitrary names can always be used in a comma-separated list.

The node configuration specified the following information:

Name that Slurm uses to refer to a node. Typically this would be the string that "/bin/hostname -s" returns. It may also be the fully qualified domain name as returned by "/bin/hostname -f" (e.g. "foo1.bar.com"), or any valid domain name associated with the host through the host database (/etc/hosts) or DNS, depending on the resolver settings. Note that if the short form of the hostname is not used, it may prevent use of hostlist expressions (the numeric portion in brackets must be at the end of the string). It may also be an arbitrary string if NodeHostname is specified. If the NodeName is "DEFAULT", the values specified with that record will apply to subsequent node specifications unless explicitly set to other values in that node record or replaced with a different set of default values. Each line where NodeName is "DEFAULT" will replace or add to previous default values and not a reinitialize the default values. For architectures in which the node order is significant, nodes will be considered consecutive in the order defined. For example, if the configuration for "NodeName=charlie" immediately follows the configuration for "NodeName=baker" they will be considered adjacent in the computer. NOTE: If the NodeName is "ALL" the process parsing the configuration will exit immediately as it is an internally reserved word.

Typically this would be the string that "/bin/hostname -s" returns. It may also be the fully qualified domain name as returned by "/bin/hostname -f" (e.g. "foo1.bar.com"), or any valid domain name associated with the host through the host database (/etc/hosts) or DNS, depending on the resolver settings. Note that if the short form of the hostname is not used, it may prevent use of hostlist expressions (the numeric portion in brackets must be at the end of the string). A node range expression can be used to specify a set of nodes. If an expression is used, the number of nodes identified by NodeHostname on a line in the configuration file must be identical to the number of nodes identified by NodeName. By default, the NodeHostname will be identical in value to NodeName.

Name that a node should be referred to in establishing a communications path. This name will be used as an argument to the getaddrinfo() function for identification. If a node range expression is used to designate multiple nodes, they must exactly match the entries in the NodeName (e.g. "NodeName=lx[0-7] NodeAddr=elx[0-7]"). NodeAddr may also contain IP addresses. By default, the NodeAddr will be identical in value to NodeHostname.

Alternate network path to be used for sbcast network traffic to a given node. This name will be used as an argument to the getaddrinfo() function. If a node range expression is used to designate multiple nodes, they must exactly match the entries in the NodeName (e.g. "NodeName=lx[0-7] BcastAddr=elx[0-7]"). BcastAddr may also contain IP addresses. By default, the BcastAddr is unset, and sbcast traffic will be routed to the NodeAddr for a given node. Note: cannot be used with CommunicationParameters=NoInAddrAny.

Number of Baseboards in nodes with a baseboard controller. Note that when Boards is specified, SocketsPerBoard, CoresPerSocket, and ThreadsPerCore should be specified. The default value is 1.

Number of cores reserved for system use. Depending upon the TaskPluginParam option of SlurmdOffSpec, the Slurm daemon slurmd may either be confined to these resources (the default) or prevented from using these resources. Isolation of slurmd from user jobs may improve application performance. A job can use these cores if AllowSpecResourcesUsage=yes and the user explicitly requests less than the configured CoreSpecCount. If this option and CpuSpecList are both designated for a node, an error is generated. For information on the algorithm used by Slurm to select the cores refer to the core specialization documentation ( https://slurm.schedmd.com/core_spec.html ).

Number of cores in a single physical processor socket (e.g. "2"). The CoresPerSocket value describes physical cores, not the logical number of processors per socket. NOTE: If you have multi-core processors, you will likely need to specify this parameter in order to optimize scheduling. The default value is 1.

If a job step request does not specify an option to control how tasks are bound to allocated CPUs (--cpu-bind) and all nodes allocated to the job have the same CpuBind option the node CpuBind option will control how tasks are bound to allocated resources. Supported values for CpuBind are "none", "socket", "ldom" (NUMA), "core" and "thread".

Number of logical processors on the node (e.g. "2"). It can be set to the total number of sockets(supported only by select/linear), cores or threads. This can be useful when you want to schedule only the cores on a hyper-threaded node. If CPUs is omitted, its default will be set equal to the product of Boards, Sockets, CoresPerSocket, and ThreadsPerCore.

A comma-delimited list of Slurm abstract CPU IDs reserved for system use. The list will be expanded to include all other CPUs, if any, on the same cores. Depending upon the TaskPluginParam option of SlurmdOffSpec, the Slurm daemon slurmd may either be confined to these resources (the default) or prevented from using these resources. Isolation of slurmd from user jobs may improve application performance. A job can use these cores if AllowSpecResourcesUsage=yes and the user explicitly requests less than the number of CPUs in this list. If this option and CoreSpecCount are both designated for a node, an error is generated. This option has no effect unless cgroup job confinement is also configured (i.e. the task/cgroup TaskPlugin is enabled and ConstrainCores=yes is set in cgroup.conf).

A comma-delimited list of arbitrary strings indicative of some characteristic associated with the node. There is no value or count associated with a feature at this time, a node either has a feature or it does not. A desired feature may contain a numeric component indicating, for example, processor speed but this numeric component will be considered to be part of the feature string. Features are intended to be used to filter nodes eligible to run jobs via the --constraint argument. By default a node has no features. Also see Gres for being able to have more control such as types and count. Using features is faster than scheduling against GRES but is limited to Boolean operations.

A comma-delimited list of generic resources specifications for a node. The format is: "<name>[:<type>][:no_consume]:<number>[K|M|G]". The first field is the resource name, which matches the GresType configuration parameter name. The optional type field might be used to identify a model of that generic resource. It is forbidden to specify both an untyped GRES and a typed GRES with the same <name>. The optional no_consume field allows you to specify that a generic resource does not have a finite number of that resource that gets consumed as it is requested. The no_consume field is a GRES specific setting and applies to the GRES, regardless of the type specified. It should not be used with GRES that has a dedicated plugin, if you're looking for a way to overcommit GPUs to multiple processes at the time you may be interested in using "shard" GRES instead. The final field must specify a generic resources count. A suffix of "K", "M", "G", "T" or "P" may be used to multiply the number by 1024, 1048576, 1073741824, etc. respectively. (e.g."Gres=gpu:tesla:1,gpu:kepler:1,bandwidth:lustre:no_consume:4G"). By default a node has no generic resources and its maximum count is that of an unsigned 64bit integer. Also see Features for Boolean flags to filter nodes using job constraints.

Amount of memory, in megabytes, reserved for system use and not available for user allocations. If the task/cgroup plugin is configured and that plugin constrains memory allocations (i.e. the task/cgroup TaskPlugin is enabled and ConstrainRAMSpace=yes is set in cgroup.conf), then Slurm compute node daemons (slurmd plus slurmstepd) will be allocated the specified memory limit. Note that having the Memory set in SelectTypeParameters as any of the options that has it as a consumable resource is needed for this option to work. The daemons will not be killed if they exhaust the memory allocation (ie. the Out-Of-Memory Killer is disabled for the daemon's memory cgroup). If the task/cgroup plugin is not configured, the specified memory will only be unavailable for user allocations.

The port number that the Slurm compute node daemon, slurmd, listens to for work on this particular node. By default there is a single port number for all slurmd daemons on all compute nodes as defined by the SlurmdPort configuration parameter. Use of this option is not generally recommended except for development or testing purposes. If multiple slurmd daemons execute on a node this can specify a range of ports.

Note: On Cray systems, Realm-Specific IP Addressing (RSIP) will automatically try to interact with anything opened on ports 8192-60000. Configure Port to use a port outside of the configured SrunPortRange and RSIP's port range.

See CPUs.

Size of real memory on the node in megabytes (e.g. "2048"). The default value is 1. Lowering RealMemory with the goal of setting aside some amount for the OS and not available for job allocations will not work as intended if Memory is not set as a consumable resource in SelectTypeParameters. So one of the *_Memory options need to be enabled for that goal to be accomplished. Also see MemSpecLimit.

Identifies the reason for a node being in state "DOWN", "DRAINED" "DRAINING", "FAIL" or "FAILING". Use quotes to enclose a reason having more than one word.

Number of physical processor sockets/chips on the node (e.g. "2"). If Sockets is omitted, it will be inferred from CPUs, CoresPerSocket, and ThreadsPerCore. NOTE: If you have multi-core processors, you will likely need to specify these parameters. Sockets and SocketsPerBoard are mutually exclusive. If Sockets is specified when Boards is also used, Sockets is interpreted as SocketsPerBoard rather than total sockets. The default value is 1.

Number of physical processor sockets/chips on a baseboard. Sockets and SocketsPerBoard are mutually exclusive. The default value is 1.

State of the node with respect to the initiation of user jobs. Acceptable values are CLOUD, DOWN, DRAIN, FAIL, FAILING, FUTURE and UNKNOWN. Node states of BUSY and IDLE should not be specified in the node configuration, but set the node state to UNKNOWN instead. Setting the node state to UNKNOWN will result in the node state being set to BUSY, IDLE or other appropriate state based upon recovered system state information. The default value is UNKNOWN. Also see the DownNodes parameter below.
Indicates the node exists in the cloud. Its initial state will be treated as powered down. The node will be available for use after its state is recovered from Slurm's state save file or the slurmd daemon starts on the compute node.

Indicates the node failed and is unavailable to be allocated work.

Indicates the node is unavailable to be allocated work.

Indicates the node is expected to fail soon, has no jobs allocated to it, and will not be allocated to any new jobs.

Indicates the node is expected to fail soon, has one or more jobs allocated to it, but will not be allocated to any new jobs.

Indicates the node is defined for future use and need not exist when the Slurm daemons are started. These nodes can be made available for use simply by updating the node state using the scontrol command rather than restarting the slurmctld daemon. After these nodes are made available, change their State in the slurm.conf file. Until these nodes are made available, they will not be seen using any Slurm commands or nor will any attempt be made to contact them.
A slurmd started with -F[<feature>] will be associated with a FUTURE node that matches the same configuration (sockets, cores, threads) as reported by slurmd -C. The node's NodeAddr and NodeHostname will automatically be retrieved from the slurmd and will be cleared when set back to the FUTURE state. Dynamic FUTURE nodes retain non-FUTURE state on restart. Use scontrol to put node back into FUTURE state.

If the mapping of the NodeName to the slurmd HostName is not updated in DNS, Dynamic Future nodes won't know how to communicate with each other -- because NodeAddr and NodeHostName are not defined in the slurm.conf -- and the fanout communications need to be disabled by setting TreeWidth to a high number (e.g. 65533). If the DNS mapping is made, then the cloud_dns SlurmctldParameter can be used.

Indicates the node's state is undefined but will be established (set to BUSY or IDLE) when the slurmd daemon on that node registers. UNKNOWN is the default state.

Number of logical threads in a single physical core (e.g. "2"). Note that the Slurm can allocate resources to jobs down to the resolution of a core. If your system is configured with more than one thread per core, execution of a different job on each thread is not supported unless you configure SelectTypeParameters=CR_CPU plus CPUs; do not configure Sockets, CoresPerSocket or ThreadsPerCore. A job can execute a one task per thread from within one job step or execute a distinct job step on each of the threads. Note also if you are running with more than 1 thread per core and running the select/cons_res or select/cons_tres plugin then you will want to set the SelectTypeParameters variable to something other than CR_CPU to avoid unexpected results. The default value is 1.

Total size of temporary disk storage in TmpFS in megabytes (e.g. "16384"). TmpFS (for "Temporary File System") identifies the location which jobs should use for temporary storage. Note this does not indicate the amount of free space available to the user on the node, only the total file system size. The system administration should ensure this file system is purged as needed so that user jobs have access to most of this space. The Prolog and/or Epilog programs (specified in the configuration file) might be used to ensure the file system is kept clean. The default value is 0.

The priority of the node for scheduling purposes. All things being equal, jobs will be allocated the nodes with the lowest weight which satisfies their requirements. For example, a heterogeneous collection of nodes might be placed into a single partition for greater system utilization, responsiveness and capability. It would be preferable to allocate smaller memory nodes rather than larger memory nodes if either will satisfy a job's requirements. The units of weight are arbitrary, but larger weights should be assigned to nodes with more processors, memory, disk space, higher processor speed, etc. Note that if a job allocation request can not be satisfied using the nodes with the lowest weight, the set of nodes with the next lowest weight is added to the set of nodes under consideration for use (repeat as needed for higher weight values). If you absolutely want to minimize the number of higher weight nodes allocated to a job (at a cost of higher scheduling overhead), give each node a distinct Weight value and they will be added to the pool of nodes being considered for scheduling individually.

The default value is 1.

NOTE: Node weights are first considered among currently available nodes. For example, a POWERED_DOWN node with a lower weight will not be evaluated before an IDLE node.

The DownNodes= parameter permits you to mark certain nodes as in a DOWN, DRAIN, FAIL, FAILING or FUTURE state without altering the permanent configuration information listed under a NodeName= specification.

Any node name, or list of node names, from the NodeName= specifications.

Identifies the reason for a node being in state DOWN, DRAIN, FAIL, FAILING or FUTURE. Use quotes to enclose a reason having more than one word.

State of the node with respect to the initiation of user jobs. Acceptable values are DOWN, DRAIN, FAIL, FAILING and FUTURE. For more information about these states see the descriptions under State in the NodeName= section above. The default value is DOWN.

On computers where frontend nodes are used to execute batch scripts rather than compute nodes, one may configure one or more frontend nodes using the configuration parameters defined below. These options are very similar to those used in configuring compute nodes. These options may only be used on systems configured and built with the appropriate parameters (--have-front-end). The front end configuration specifies the following information:

Comma-separated list of group names which may execute jobs on this front end node. By default, all groups may use this front end node. A user will be permitted to use this front end node if AllowGroups has at least one group associated with the user. May not be used with the DenyGroups option.

Comma-separated list of user names which may execute jobs on this front end node. By default, all users may use this front end node. May not be used with the DenyUsers option.

Comma-separated list of group names which are prevented from executing jobs on this front end node. May not be used with the AllowGroups option.

Comma-separated list of user names which are prevented from executing jobs on this front end node. May not be used with the AllowUsers option.

Name that Slurm uses to refer to a frontend node. Typically this would be the string that "/bin/hostname -s" returns. It may also be the fully qualified domain name as returned by "/bin/hostname -f" (e.g. "foo1.bar.com"), or any valid domain name associated with the host through the host database (/etc/hosts) or DNS, depending on the resolver settings. Note that if the short form of the hostname is not used, it may prevent use of hostlist expressions (the numeric portion in brackets must be at the end of the string). If the FrontendName is "DEFAULT", the values specified with that record will apply to subsequent node specifications unless explicitly set to other values in that frontend node record or replaced with a different set of default values. Each line where FrontendName is "DEFAULT" will replace or add to previous default values and not a reinitialize the default values.

Name that a frontend node should be referred to in establishing a communications path. This name will be used as an argument to the getaddrinfo() function for identification. As with FrontendName, list the individual node addresses rather than using a hostlist expression. The number of FrontendAddr records per line must equal the number of FrontendName records per line (i.e. you can't map to node names to one address). FrontendAddr may also contain IP addresses. By default, the FrontendAddr will be identical in value to FrontendName.

The port number that the Slurm compute node daemon, slurmd, listens to for work on this particular frontend node. By default there is a single port number for all slurmd daemons on all frontend nodes as defined by the SlurmdPort configuration parameter. Use of this option is not generally recommended except for development or testing purposes.

Note: On Cray systems, Realm-Specific IP Addressing (RSIP) will automatically try to interact with anything opened on ports 8192-60000. Configure Port to use a port outside of the configured SrunPortRange and RSIP's port range.

Identifies the reason for a frontend node being in state DOWN, DRAINED, DRAINING, FAIL or FAILING. Use quotes to enclose a reason having more than one word.

State of the frontend node with respect to the initiation of user jobs. Acceptable values are DOWN, DRAIN, FAIL, FAILING and UNKNOWN. Node states of BUSY and IDLE should not be specified in the node configuration, but set the node state to UNKNOWN instead. Setting the node state to UNKNOWN will result in the node state being set to BUSY, IDLE or other appropriate state based upon recovered system state information. For more information about these states see the descriptions under State in the NodeName= section above. The default value is UNKNOWN.

As an example, you can do something similar to the following to define four front end nodes for running slurmd daemons.

FrontendName=frontend[00-03] FrontendAddr=efrontend[00-03] State=UNKNOWN

The nodeset configuration allows you to define a name for a specific set of nodes which can be used to simplify the partition configuration section, especially for heterogenous or condo-style systems. Each nodeset may be defined by an explicit list of nodes, and/or by filtering the nodes by a particular configured feature. If both Feature= and Nodes= are used the nodeset shall be the union of the two subsets. Note that the nodesets are only used to simplify the partition definitions at present, and are not usable outside of the partition configuration.

All nodes with this single feature will be included as part of this nodeset.

List of nodes in this set.

Unique name for a set of nodes. Must not overlap with any NodeName definitions.

The partition configuration permits you to establish different job limits or access controls for various groups (or partitions) of nodes. Nodes may be in more than one partition, making partitions serve as general purpose queues. For example one may put the same set of nodes into two different partitions, each with different constraints (time limit, job sizes, groups allowed to use the partition, etc.). Jobs are allocated resources within a single partition. Default values can be specified with a record in which PartitionName is "DEFAULT". The default entry values will apply only to lines following it in the configuration file and the default values can be reset multiple times in the configuration file with multiple entries where "PartitionName=DEFAULT". The "PartitionName=" specification must be placed on every line describing the configuration of partitions. Each line where PartitionName is "DEFAULT" will replace or add to previous default values and not a reinitialize the default values. A single partition name can not appear as a PartitionName value in more than one line (duplicate partition name records will be ignored). If a partition that is in use is deleted from the configuration and slurm is restarted or reconfigured (scontrol reconfigure), jobs using the partition are canceled. NOTE: Put all parameters for each partition on a single line. Each line of partition configuration information should represent a different partition. The partition configuration file contains the following information:

Comma-separated list of nodes from which users can submit jobs in the partition. Node names may be specified using the node range expression syntax described above. The default value is "ALL".

Comma-separated list of accounts which may execute jobs in the partition. The default value is "ALL". NOTE: If AllowAccounts is used then DenyAccounts will not be enforced. Also refer to DenyAccounts.

Comma-separated list of group names which may execute jobs in this partition. A user will be permitted to submit a job to this partition if AllowGroups has at least one group associated with the user. Jobs executed as user root or as user SlurmUser will be allowed to use any partition, regardless of the value of AllowGroups. In addition, a Slurm Admin or Operator will be able to view any partition, regardless of the value of AllowGroups. If user root attempts to execute a job as another user (e.g. using srun's --uid option), then the job will be subject to AllowGroups as if it were submitted by that user. By default, AllowGroups is unset, meaning all groups are allowed to use this partition. The special value 'ALL' is equivalent to this. Users who are not members of the specified group will not see information about this partition by default. However, this should not be treated as a security mechanism, since job information will be returned if a user requests details about the partition or a specific job. See the PrivateData parameter to restrict access to job information. NOTE: For performance reasons, Slurm maintains a list of user IDs allowed to use each partition and this is checked at job submission time. This list of user IDs is updated when the slurmctld daemon is restarted, reconfigured (e.g. "scontrol reconfig") or the partition's AllowGroups value is reset, even if is value is unchanged (e.g. "scontrol update PartitionName=name AllowGroups=group"). For a user's access to a partition to change, both his group membership must change and Slurm's internal user ID list must change using one of the methods described above.

Comma-separated list of Qos which may execute jobs in the partition. Jobs executed as user root can use any partition without regard to the value of AllowQos. The default value is "ALL". NOTE: If AllowQos is used then DenyQos will not be enforced. Also refer to DenyQos.

Partition name of alternate partition to be used if the state of this partition is "DRAIN" or "INACTIVE."

If a job step request does not specify an option to control how tasks are bound to allocated CPUs (--cpu-bind) and all nodes allocated to the job do not have the same CpuBind option the node. Then the partition's CpuBind option will control how tasks are bound to allocated resources. Supported values forCpuBind are "none", "socket", "ldom" (NUMA), "core" and "thread".

If this keyword is set, jobs submitted without a partition specification will utilize this partition. Possible values are "YES" and "NO". The default value is "NO".

Run time limit used for jobs that don't specify a value. If not set then MaxTime will be used. Format is the same as for MaxTime.

Default count of CPUs allocated per allocated GPU. This value is used only if the job didn't specify --cpus-per-task and --cpus-per-gpu.

Default real memory size available per allocated CPU in megabytes. Used to avoid over-subscribing memory and causing paging. DefMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_res or SelectType=select/cons_tres). If not set, the DefMemPerCPU value for the entire cluster will be used. Also see DefMemPerGPU, DefMemPerNode and MaxMemPerCPU. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclusive.

Default real memory size available per allocated GPU in megabytes. Also see DefMemPerCPU, DefMemPerNode and MaxMemPerCPU. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclusive.

Default real memory size available per allocated node in megabytes. Used to avoid over-subscribing memory and causing paging. DefMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are over-subscribed (OverSubscribe=yes or OverSubscribe=force). If not set, the DefMemPerNode value for the entire cluster will be used. Also see DefMemPerCPU, DefMemPerGPU and MaxMemPerCPU. DefMemPerCPU, DefMemPerGPU and DefMemPerNode are mutually exclusive.

Comma-separated list of accounts which may not execute jobs in the partition. By default, no accounts are denied access NOTE: If AllowAccounts is used then DenyAccounts will not be enforced. Also refer to AllowAccounts.

Comma-separated list of Qos which may not execute jobs in the partition. By default, no QOS are denied access NOTE: If AllowQos is used then DenyQos will not be enforced. Also refer AllowQos.

If set to "YES" then user root will be prevented from running any jobs on this partition. The default value will be the value of DisableRootJobs set outside of a partition specification (which is "NO", allowing user root to execute jobs).

If set to "YES" then nodes will be exclusively allocated to users. Multiple jobs may be run for the same user, but only one user can be active at a time. This capability is also available on a per-job basis by using the --exclusive=user option.

Specifies, in units of seconds, the preemption grace time to be extended to a job which has been selected for preemption. The default value is zero, no preemption grace time is allowed on this partition. Once a job has been selected for preemption, its end time is set to the current time plus GraceTime. The job's tasks are immediately sent SIGCONT and SIGTERM signals in order to provide notification of its imminent termination. This is followed by the SIGCONT, SIGTERM and SIGKILL signal sequence upon reaching its new end time. This second set of signals is sent to both the tasks and the containing batch script, if applicable. See also the global KillWait configuration parameter.

Specifies if the partition and its jobs are to be hidden by default. Hidden partitions will by default not be reported by the Slurm APIs or commands. Possible values are "YES" and "NO". The default value is "NO". Note that partitions that a user lacks access to by virtue of the AllowGroups parameter will also be hidden by default.

Schedule resources to jobs on the least loaded nodes (based upon the number of idle CPUs). This is generally only recommended for an environment with serial jobs as idle resources will tend to be highly fragmented, resulting in parallel jobs being distributed across many nodes. Note that node Weight takes precedence over how many idle resources are on each node. Also see the SelectTypeParameters configuration parameter CR_LLN to use the least loaded nodes in every partition.

Maximum number of CPUs on any node available to all jobs from this partition. This can be especially useful to schedule GPUs. For example a node can be associated with two Slurm partitions (e.g. "cpu" and "gpu") and the partition/queue "cpu" could be limited to only a subset of the node's CPUs, ensuring that one or more CPUs would be available to jobs in the "gpu" partition/queue.

Maximum real memory size available per allocated CPU in megabytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_res or SelectType=select/cons_tres). If not set, the MaxMemPerCPU value for the entire cluster will be used. Also see DefMemPerCPU and MaxMemPerNode. MaxMemPerCPU and MaxMemPerNode are mutually exclusive.

Maximum real memory size available per allocated node in megabytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are over-subscribed (OverSubscribe=yes or OverSubscribe=force). If not set, the MaxMemPerNode value for the entire cluster will be used. Also see DefMemPerNode and MaxMemPerCPU. MaxMemPerCPU and MaxMemPerNode are mutually exclusive.

Maximum count of nodes which may be allocated to any single job. The default value is "UNLIMITED", which is represented internally as -1.

Maximum run time limit for jobs. Format is minutes, minutes:seconds, hours:minutes:seconds, days-hours, days-hours:minutes, days-hours:minutes:seconds or "UNLIMITED". Time resolution is one minute and second values are rounded up to the next minute. The job TimeLimit may be updated by root, SlurmUser or an Operator to a value higher than the configured MaxTime after job submission.

Minimum count of nodes which may be allocated to any single job. The default value is 0.

Comma-separated list of nodes or nodesets which are associated with this partition. Node names may be specified using the node range expression syntax described above. A blank list of nodes (i.e. "Nodes= ") can be used if one wants a partition to exist, but have no resources (possibly on a temporary basis). A value of "ALL" is mapped to all nodes configured in the cluster.

Controls the ability of the partition to execute more than one job at a time on each resource (node, socket or core depending upon the value of SelectTypeParameters). If resources are to be over-subscribed, avoiding memory over-subscription is very important. SelectTypeParameters should be configured to treat memory as a consumable resource and the --mem option should be used for job allocations. Sharing of resources is typically useful only when using gang scheduling (PreemptMode=suspend,gang). Possible values for OverSubscribe are "EXCLUSIVE", "FORCE", "YES", and "NO". Note that a value of "YES" or "FORCE" can negatively impact performance for systems with many thousands of running jobs. The default value is "NO". For more information see the following web pages:
https://slurm.schedmd.com/cons_res.html
https://slurm.schedmd.com/cons_res_share.html
https://slurm.schedmd.com/gang_scheduling.html
https://slurm.schedmd.com/preempt.html
Allocates entire nodes to jobs even with SelectType=select/cons_res or SelectType=select/cons_tres configured. Jobs that run in partitions with OverSubscribe=EXCLUSIVE will have exclusive access to all allocated nodes. These jobs are allocated all CPUs and GRES on the nodes, but they are only allocated as much memory as they ask for. This is by design to support gang scheduling, because suspended jobs still reside in memory. To request all the memory on a node, use --mem=0 at submit time.

Makes all resources (except GRES) in the partition available for oversubscription without any means for users to disable it. May be followed with a colon and maximum number of jobs in running or suspended state. For example OverSubscribe=FORCE:4 enables each node, socket or core to oversubscribe each resource four ways. Recommended only for systems using PreemptMode=suspend,gang.

NOTE: OverSubscribe=FORCE:1 is a special case that is not exactly equivalent to OverSubscribe=NO. OverSubscribe=FORCE:1 disables the regular oversubscription of resources in the same partition but it will still allow oversubscription due to preemption. Setting OverSubscribe=NO will prevent oversubscription from happening due to preemption as well.

NOTE: If using PreemptType=preempt/qos you can specify a value for FORCE that is greater than 1. For example, OverSubscribe=FORCE:2 will permit two jobs per resource normally, but a third job can be started only if done so through preemption based upon QOS.

NOTE: If OverSubscribe is configured to FORCE or YES in your slurm.conf and the system is not configured to use preemption (PreemptMode=OFF) accounting can easily grow to values greater than the actual utilization. It may be common on such systems to get error messages in the slurmdbd log stating: "We have more allocated time than is possible."

Makes all resources (except GRES) in the partition available for sharing upon request by the job. Resources will only be over-subscribed when explicitly requested by the user using the "--oversubscribe" option on job submission. May be followed with a colon and maximum number of jobs in running or suspended state. For example "OverSubscribe=YES:4" enables each node, socket or core to execute up to four jobs at once. Recommended only for systems running with gang scheduling (PreemptMode=suspend,gang).

Selected resources are allocated to a single job. No resource will be allocated to more than one job.

NOTE: Even if you are using PreemptMode=suspend,gang, setting OverSubscribe=NO will disable preemption on that partition. Use OverSubscribe=FORCE:1 if you want to disable normal oversubscription but still allow suspension due to preemption.

Number of minutes by which a job can exceed its time limit before being canceled. Normally a job's time limit is treated as a hard limit and the job will be killed upon reaching that limit. Configuring OverTimeLimit will result in the job's time limit being treated like a soft limit. Adding the OverTimeLimit value to the soft time limit provides a hard time limit, at which point the job is canceled. This is particularly useful for backfill scheduling, which bases upon each job's soft time limit. If not set, the OverTimeLimit value for the entire cluster will be used. May not exceed 65533 minutes. A value of "UNLIMITED" is also supported.

Name by which the partition may be referenced (e.g. "Interactive"). This name can be specified by users when submitting jobs. If the PartitionName is "DEFAULT", the values specified with that record will apply to subsequent partition specifications unless explicitly set to other values in that partition record or replaced with a different set of default values. Each line where PartitionName is "DEFAULT" will replace or add to previous default values and not a reinitialize the default values.

Mechanism used to preempt jobs or enable gang scheduling for this partition when PreemptType=preempt/partition_prio is configured. This partition-specific PreemptMode configuration parameter will override the cluster-wide PreemptMode for this partition. It can be set to OFF to disable preemption and gang scheduling for this partition. See also PriorityTier and the above description of the cluster-wide PreemptMode parameter for further details.
The GANG option is used to enable gang scheduling independent of whether preemption is enabled (i.e. independent of the PreemptType setting). It can be specified in addition to a PreemptMode setting with the two options comma separated (e.g. PreemptMode=SUSPEND,GANG).
See <https://slurm.schedmd.com/preempt.html> and <https://slurm.schedmd.com/gang_scheduling.html> for more details.

NOTE: For performance reasons, the backfill scheduler reserves whole nodes for jobs, not partial nodes. If during backfill scheduling a job preempts one or more other jobs, the whole nodes for those preempted jobs are reserved for the preemptor job, even if the preemptor job requested fewer resources than that. These reserved nodes aren't available to other jobs during that backfill cycle, even if the other jobs could fit on the nodes. Therefore, jobs may preempt more resources during a single backfill iteration than they requested.
NOTE: For heterogeneous job to be considered for preemption all components must be eligible for preemption. When a heterogeneous job is to be preempted the first identified component of the job with the highest order PreemptMode (SUSPEND (highest), REQUEUE, CANCEL (lowest)) will be used to set the PreemptMode for all components. The GraceTime and user warning signal for each component of the heterogeneous job remain unique. Heterogeneous jobs are excluded from GANG scheduling operations.

Is the default value and disables job preemption and gang scheduling. It is only compatible with PreemptType=preempt/none at a global level. A common use case for this parameter is to set it on a partition to disable preemption for that partition.

The preempted job will be cancelled.

Enables gang scheduling (time slicing) of jobs in the same partition, and allows the resuming of suspended jobs.

NOTE: Gang scheduling is performed independently for each partition, so if you only want time-slicing by OverSubscribe, without any preemption, then configuring partitions with overlapping nodes is not recommended. On the other hand, if you want to use PreemptType=preempt/partition_prio to allow jobs from higher PriorityTier partitions to Suspend jobs from lower PriorityTier partitions you will need overlapping partitions, and PreemptMode=SUSPEND,GANG to use the Gang scheduler to resume the suspended jobs(s). In any case, time-slicing won't happen between jobs on different partitions.
NOTE: Heterogeneous jobs are excluded from GANG scheduling operations.

Preempts jobs by requeuing them (if possible) or canceling them. For jobs to be requeued they must have the --requeue sbatch option set or the cluster wide JobRequeue parameter in slurm.conf must be set to 1.

The preempted jobs will be suspended, and later the Gang scheduler will resume them. Therefore the SUSPEND preemption mode always needs the GANG option to be specified at the cluster level. Also, because the suspended jobs will still use memory on the allocated nodes, Slurm needs to be able to track memory resources to be able to suspend jobs.

If the preemptees and preemptor are on different partitions then the preempted jobs will remain suspended until the preemptor ends.
NOTE: Because gang scheduling is performed independently for each partition, if using PreemptType=preempt/partition_prio then jobs in higher PriorityTier partitions will suspend jobs in lower PriorityTier partitions to run on the released resources. Only when the preemptor job ends will the suspended jobs will be resumed by the Gang scheduler.
NOTE: Suspended jobs will not release GRES. Higher priority jobs will not be able to preempt to gain access to GRES.

Partition factor used by priority/multifactor plugin in calculating job priority. The value may not exceed 65533. Also see PriorityTier.

Jobs submitted to a partition with a higher PriorityTier value will be evaluated by the scheduler before pending jobs in a partition with a lower PriorityTier value. They will also be considered for preemption of running jobs in partition(s) with lower PriorityTier values if PreemptType=preempt/partition_prio. The value may not exceed 65533. Also see PriorityJobFactor.

Used to extend the limits available to a QOS on a partition. Jobs will not be associated to this QOS outside of being associated to the partition. They will still be associated to their requested QOS. By default, no QOS is used. NOTE: If a limit is set in both the Partition's QOS and the Job's QOS the Partition QOS will be honored unless the Job's QOS has the OverPartQOS flag set in which the Job's QOS will have priority.

Specifies users of this partition are required to designate a reservation when submitting a job. This option can be useful in restricting usage of a partition that may have higher priority or additional resources to be allowed only within a reservation. Possible values are "YES" and "NO". The default value is "NO".

Maximum time permitted (in seconds) between when a node resume request is issued and when the node is actually available for use. Nodes which fail to respond in this time frame will be marked DOWN and the jobs scheduled on the node requeued. Nodes which reboot after this time frame will be marked DOWN with a reason of "Node unexpectedly rebooted." For nodes that are in multiple partitions with this option set, the highest time will take effect. If not set on any partition, the node will use the ResumeTimeout value set for the entire cluster.

Specifies if only user ID zero (i.e. user root) may allocate resources in this partition. User root may allocate resources for any other user, but the request must be initiated by user root. This option can be useful for a partition to be managed by some external entity (e.g. a higher-level job manager) and prevents users from directly using those resources. Possible values are "YES" and "NO". The default value is "NO".

Partition-specific resource allocation type. This option replaces the global SelectTypeParameters value. Supported values are CR_Core, CR_Core_Memory, CR_Socket and CR_Socket_Memory. Use requires the system-wide SelectTypeParameters value be set to any of the four supported values previously listed; otherwise, the partition-specific value will be ignored.

The Shared configuration parameter has been replaced by the OverSubscribe parameter described above.

State of partition or availability for use. Possible values are "UP", "DOWN", "DRAIN" and "INACTIVE". The default value is "UP". See also the related "Alternate" keyword.
Designates that new jobs may be queued on the partition, and that jobs may be allocated nodes and run from the partition.

Designates that new jobs may be queued on the partition, but queued jobs may not be allocated nodes and run from the partition. Jobs already running on the partition continue to run. The jobs must be explicitly canceled to force their termination.

Designates that no new jobs may be queued on the partition (job submission requests will be denied with an error message), but jobs already queued on the partition may be allocated nodes and run. See also the "Alternate" partition specification.

Designates that no new jobs may be queued on the partition, and jobs already queued may not be allocated nodes and run. See also the "Alternate" partition specification.

Nodes which remain idle or down for this number of seconds will be placed into power save mode by SuspendProgram. For nodes that are in multiple partitions with this option set, the highest time will take effect. If not set on any partition, the node will use the SuspendTime value set for the entire cluster. Setting SuspendTime to INFINITE will disable suspending of nodes in this partition. Setting SuspendTime to anything but INFINITE (or -1) will enable power save mode.

Maximum time permitted (in seconds) between when a node suspend request is issued and when the node is shutdown. At that time the node must be ready for a resume request to be issued as needed for new work. For nodes that are in multiple partitions with this option set, the highest time will take effect. If not set on any partition, the node will use the SuspendTimeout value set for the entire cluster.

TRESBillingWeights is used to define the billing weights of each TRES type that will be used in calculating the usage of a job. The calculated usage is used when calculating fairshare and when enforcing the TRES billing limit on jobs.

Billing weights are specified as a comma-separated list of <TRES Type>=<TRES Billing Weight> pairs.

Any TRES Type is available for billing. Note that the base unit for memory and burst buffers is megabytes.

By default the billing of TRES is calculated as the sum of all TRES types multiplied by their corresponding billing weight.

The weighted amount of a resource can be adjusted by adding a suffix of K,M,G,T or P after the billing weight. For example, a memory weight of "mem=.25" on a job allocated 8GB will be billed 2048 (8192MB *.25) units. A memory weight of "mem=.25G" on the same job will be billed 2 (8192MB * (.25/1024)) units.

Negative values are allowed.

When a job is allocated 1 CPU and 8 GB of memory on a partition configured with TRESBillingWeights="CPU=1.0,Mem=0.25G,GRES/gpu=2.0", the billable TRES will be: (1*1.0) + (8*0.25) + (0*2.0) = 3.0.

If PriorityFlags=MAX_TRES is configured, the billable TRES is calculated as the MAX of individual TRES' on a node (e.g. cpus, mem, gres) plus the sum of all global TRES' (e.g. licenses). Using the same example above the billable TRES will be MAX(1*1.0, 8*0.25) + (0*2.0) = 2.0.

If TRESBillingWeights is not defined then the job is billed against the total number of allocated CPUs.

NOTE: TRESBillingWeights doesn't affect job priority directly as it is currently not used for the size of the job. If you want TRES' to play a role in the job's priority then refer to the PriorityWeightTRES option.


There are a variety of prolog and epilog program options that execute with various permissions and at various times. The four options most likely to be used are: Prolog and Epilog (executed once on each compute node for each job) plus PrologSlurmctld and EpilogSlurmctld (executed once on the ControlMachine for each job).

NOTE: Standard output and error messages are normally not preserved. Explicitly write output and error messages to an appropriate location if you wish to preserve that information.

NOTE: By default the Prolog script is ONLY run on any individual node when it first sees a job step from a new allocation. It does not run the Prolog immediately when an allocation is granted. If no job steps from an allocation are run on a node, it will never run the Prolog for that allocation. This Prolog behaviour can be changed by the PrologFlags parameter. The Epilog, on the other hand, always runs on every node of an allocation when the allocation is released.

If the Epilog fails (returns a non-zero exit code), this will result in the node being set to a DRAIN state. If the EpilogSlurmctld fails (returns a non-zero exit code), this will only be logged. If the Prolog fails (returns a non-zero exit code), this will result in the node being set to a DRAIN state and the job being requeued in a held state unless nohold_on_prolog_fail is configured in SchedulerParameters. If the PrologSlurmctld fails (returns a non-zero exit code), this will result in the job being requeued to be executed on another node if possible. Only batch jobs can be requeued. Interactive jobs (salloc and srun) will be cancelled if the PrologSlurmctld fails. If slurmcltd is stopped while either PrologSlurmctld or EpilogSlurmctld is running, the script will be killed with SIGKILL. The script will restart when slurmctld restarts.

Information about the job is passed to the script using environment variables. Unless otherwise specified, these environment variables are available in each of the scripts mentioned above (Prolog, Epilog, PrologSlurmctld and EpilogSlurmctld). For a full list of environment variables that includes those available in the SrunProlog, SrunEpilog, TaskProlog and TaskEpilog please see the Prolog and Epilog Guide <https://slurm.schedmd.com/prolog_epilog.html>.

If this job is part of a job array, this will be set to the job ID. Otherwise it will not be set. To reference this specific task of a job array, combine SLURM_ARRAY_JOB_ID with SLURM_ARRAY_TASK_ID (e.g. "scontrol update ${SLURM_ARRAY_JOB_ID}_{$SLURM_ARRAY_TASK_ID} ..."); Available in PrologSlurmctld and EpilogSlurmctld.

If this job is part of a job array, this will be set to the task ID. Otherwise it will not be set. To reference this specific task of a job array, combine SLURM_ARRAY_JOB_ID with SLURM_ARRAY_TASK_ID (e.g. "scontrol update ${SLURM_ARRAY_JOB_ID}_{$SLURM_ARRAY_TASK_ID} ..."); Available in PrologSlurmctld and EpilogSlurmctld.

If this job is part of a job array, this will be set to the maximum task ID. Otherwise it will not be set. Available in PrologSlurmctld and EpilogSlurmctld.

If this job is part of a job array, this will be set to the minimum task ID. Otherwise it will not be set. Available in PrologSlurmctld and EpilogSlurmctld.

If this job is part of a job array, this will be set to the step size of task IDs. Otherwise it will not be set. Available in PrologSlurmctld and EpilogSlurmctld.

Name of the cluster executing the job.

Location of the slurm.conf file. Available in Prolog and Epilog.

Name of the node running the task. In the case of a parallel job executing on multiple compute nodes, the various tasks will have this environment variable set to different values on each compute node. Available in Prolog and Epilog.

Account name used for the job.

Comment added to the job. Available in Prolog, PrologSlurmctld, Epilog and EpilogSlurmctld.

Features required to run the job. Available in Prolog, PrologSlurmctld, Epilog and EpilogSlurmctld.

The highest exit code of all of the job steps. Available in Epilog and EpilogSlurmctld.

The exit code of the job script (or salloc). The value is the status as returned by the wait() system call (See wait(2)) Available in Epilog and EpilogSlurmctld.

The exit code of the job script (or salloc). The value has the format <exit>:<sig>. The first number is the exit code, typically as set by the exit() function. The second number of the signal that caused the process to terminate if it was terminated by a signal. Available in Epilog and EpilogSlurmctld.

Group ID of the job's owner.

The GPU IDs of GPUs in the job allocation (if any). Available in the Prolog and Epilog.

Group name of the job's owner. Available in PrologSlurmctld and EpilogSlurmctld.

Job ID.

Job ID.

Name of the job. Available in PrologSlurmctld and EpilogSlurmctld.

Nodes assigned to job. A Slurm hostlist expression. "scontrol show hostnames" can be used to convert this to a list of individual host names. Available in PrologSlurmctld and EpilogSlurmctld.

Partition that job runs in. Available in Prolog, PrologSlurmctld, Epilog and EpilogSlurmctld.

User ID of the job's owner.

User name of the job's owner.

Identifies which epilog or prolog program is currently running.

This program can be used to take special actions to clean up the unkillable processes and/or notify system administrators. The program will be run as SlurmdUser (usually "root") on the compute node where UnkillableStepTimeout was triggered.

Information about the unkillable job step is passed to the script using environment variables.

Job ID.

Job Step ID.

Slurm is able to optimize job allocations to minimize network contention. Special Slurm logic is used to optimize allocations on systems with a three-dimensional interconnect. and information about configuring those systems are available on web pages available here: <https://slurm.schedmd.com/>. For a hierarchical network, Slurm needs to have detailed information about how nodes are configured on the network switches.

Given network topology information, Slurm allocates all of a job's resources onto a single leaf of the network (if possible) using a best-fit algorithm. Otherwise it will allocate a job's resources onto multiple leaf switches so as to minimize the use of higher-level switches. The TopologyPlugin parameter controls which plugin is used to collect network topology information. The only values presently supported are "topology/3d_torus" (default for Cray XT/XE systems, performs best-fit logic over three-dimensional topology), "topology/none" (default for other systems, best-fit logic over one-dimensional topology), "topology/tree" (determine the network topology based upon information contained in a topology.conf file, see "man topology.conf" for more information). Future plugins may gather topology information directly from the network. The topology information is optional. If not provided, Slurm will perform a best-fit algorithm assuming the nodes are in a one-dimensional array as configured and the communications cost is related to the node distance in this array.

If the cluster's computers used for the primary or backup controller will be out of service for an extended period of time, it may be desirable to relocate them. In order to do so, follow this procedure:

1. Stop the Slurm daemons
2. Modify the slurm.conf file appropriately
3. Distribute the updated slurm.conf file to all nodes
4. Restart the Slurm daemons

There should be no loss of any running or pending jobs. Ensure that any nodes added to the cluster have the current slurm.conf file installed.

CAUTION: If two nodes are simultaneously configured as the primary controller (two nodes on which SlurmctldHost specify the local host and the slurmctld daemon is executing on each), system behavior will be destructive. If a compute node has an incorrect SlurmctldHost parameter, that node may be rendered unusable, but no other harm will result.

#
# Sample /etc/slurm.conf for dev[0-25].llnl.gov
# Author: John Doe
# Date: 11/06/2001
#
SlurmctldHost=dev0(12.34.56.78)  # Primary server
SlurmctldHost=dev1(12.34.56.79)  # Backup server
#
AuthType=auth/munge
Epilog=/usr/local/slurm/epilog
Prolog=/usr/local/slurm/prolog
FirstJobId=65536
InactiveLimit=120
JobCompType=jobcomp/filetxt
JobCompLoc=/var/log/slurm/jobcomp
KillWait=30
MaxJobCount=10000
MinJobAge=3600
PluginDir=/usr/local/lib:/usr/local/slurm/lib
ReturnToService=0
SchedulerType=sched/backfill
SlurmctldLogFile=/var/log/slurm/slurmctld.log
SlurmdLogFile=/var/log/slurm/slurmd.log
SlurmctldPort=7002
SlurmdPort=7003
SlurmdSpoolDir=/var/spool/slurmd.spool
StateSaveLocation=/var/spool/slurm.state
SwitchType=switch/none
TmpFS=/tmp
WaitTime=30
#
# Node Configurations
#
NodeName=DEFAULT CPUs=2 RealMemory=2000 TmpDisk=64000
NodeName=DEFAULT State=UNKNOWN
NodeName=dev[0-25] NodeAddr=edev[0-25] Weight=16
# Update records for specific DOWN nodes
DownNodes=dev20 State=DOWN Reason="power,ETA=Dec25"
#
# Partition Configurations
#
PartitionName=DEFAULT MaxTime=30 MaxNodes=10 State=UP
PartitionName=debug Nodes=dev[0-8,18-25] Default=YES
PartitionName=batch Nodes=dev[9-17]  MinNodes=4
PartitionName=long Nodes=dev[9-17] MaxTime=120 AllowGroups=admin

The "include" key word can be used with modifiers within the specified pathname. These modifiers would be replaced with cluster name or other information depending on which modifier is specified. If the included file is not an absolute path name (i.e. it does not start with a slash), it will searched for in the same directory as the slurm.conf file.

%c
Cluster name specified in the slurm.conf will be used.

EXAMPLE

ClusterName=linux
include /home/slurm/etc/%c_config
# Above line interpreted as
# "include /home/slurm/etc/linux_config"

There are three classes of files: Files used by slurmctld must be accessible by user SlurmUser and accessible by the primary and backup control machines. Files used by slurmd must be accessible by user root and accessible from every compute node. A few files need to be accessible by normal users on all login and compute nodes. While many files and directories are listed below, most of them will not be used with most configurations.

Must be executable by user root. It is recommended that the file be readable by all users. The file must exist on every compute node.

Must be executable by user SlurmUser. It is recommended that the file be readable by all users. The file must be accessible by the primary and backup control machines.

Must be executable by user root. It is recommended that the file be readable by all users. The file must exist on every compute node.

If this specifies a file, it must be writable by user SlurmUser. The file must be accessible by the primary and backup control machines.

Must be executable by user SlurmUser. Must not be writable by regular users. The file must be accessible by the primary and backup control machines.

Must be executable by user root. It is recommended that the file be readable by all users. The file must exist on every compute node.

Must be executable by user SlurmUser. It is recommended that the file be readable by all users. The file must be accessible by the primary and backup control machines.

Must be executable by user SlurmUser. The file must be accessible by the primary and backup control machines.

Readable to all users on all nodes. Must not be writable by regular users.

Must be writable by user SlurmUser. The file must be accessible by the primary and backup control machines.

Must be writable by user root. Preferably writable and removable by SlurmUser. The file must be accessible by the primary and backup control machines.

Must be writable by user root. A distinct file must exist on each compute node.

Must be writable by user root. A distinct file must exist on each compute node.

Must be writable by user root. Permissions must be set to 755 so that job scripts can be executed from this directory. A distinct file must exist on each compute node.

Must be executable by all users. The file must exist on every login and compute node.

Must be executable by all users. The file must exist on every login and compute node.

Must be writable by user SlurmUser. The file must be accessible by the primary and backup control machines.

Must be executable by user SlurmUser. The file must be accessible by the primary and backup control machines.

Must be executable by all users. The file must exist on every compute node.

Must be executable by all users. The file must exist on every compute node.

Must be executable by user SlurmUser. The file must be accessible by the primary and backup control machines.

Note that while Slurm daemons create log files and other files as needed, it treats the lack of parent directories as a fatal error. This prevents the daemons from running if critical file systems are not mounted and will minimize the risk of cold-starting (starting without preserving jobs).

Log files and job accounting files may need to be created/owned by the "SlurmUser" uid to be successfully accessed. Use the "chown" and "chmod" commands to set the ownership and permissions appropriately. See the section FILE AND DIRECTORY PERMISSIONS for information about the various files and directories used by Slurm.

It is recommended that the logrotate utility be used to ensure that various log files do not become too large. This also applies to text files used for accounting, process tracking, and the slurmdbd log if they are used.

Here is a sample logrotate configuration. Make appropriate site modifications and save as /etc/logrotate.d/slurm on all nodes. See the logrotate man page for more details.

##
# Slurm Logrotate Configuration
##
/var/log/slurm/*.log {
	compress
	missingok
	nocopytruncate
	nodelaycompress
	nomail
	notifempty
	noolddir
	rotate 5
	sharedscripts
	size=5M
	create 640 slurm root
	postrotate
		pkill -x --signal SIGUSR2 slurmctld
		pkill -x --signal SIGUSR2 slurmd
		pkill -x --signal SIGUSR2 slurmdbd
		exit 0
	endscript
}

Copyright (C) 2002-2007 The Regents of the University of California. Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
Copyright (C) 2008-2010 Lawrence Livermore National Security.
Copyright (C) 2010-2022 SchedMD LLC.

This file is part of Slurm, a resource management program. For details, see <https://slurm.schedmd.com/>.

Slurm is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

Slurm is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

/etc/slurm.conf

cgroup.conf(5), getaddrinfo(3), getrlimit(2), gres.conf(5), group(5), hostname(1), scontrol(1), slurmctld(8), slurmd(8), slurmdbd(8), slurmdbd.conf(5), srun(1), spank(7), syslog(3), topology.conf(5)

Slurm Configuration File December 2022