tuna - program for tuning running processes
This manual page explains the tuna program. The program can
be used to change the attributes of application and kernel threads.
tuna can operate on IRQs by name or number, and tasks or threads by
process ID or command-line. CPUs and sets of CPUs can be specified by CPU or
socket number. IRQ names and process command-lines can include
wildcards.
tuna can change scheduling policy, scheduler priority and
processor affinity for processes and process threads. tuna can also
change the processor affinity for interrupts. When tuna is invoked
without any options it starts up in its graphical interface mode. This
manual page explains only the command-line options for tuna
tuna has both action options and modifier
options. Modifier options must be specified on the command-line before the
actions they are intended to modify. Any modifier option applies to
following actions on the same command-line until it is over-ridden.
- Actions
- -h, --help
- Print a list of options. tuna will exit after this action, ignoring
the remainder of the command-line.
- -g, --gui
- Start the GUI. Actions that follow this on the command-line will be
processed without waiting for the GUI to complete.
- -a,
--config_file_apply=profilename
- Apply changes described in profile
- -l,
--config_file_list
- List preloaded profiles
- -i, --isolate
- Move all threads away from CPU-LIST. Requires -c or -S.
- -I, --include
- Allow all threads to run on CPU-LIST. Requires -c or
-S.
- -m, --move
- Move selected entities to CPU-LIST. Requires -c and either
-t or -q.
- -p,
--priority=[POLICY:]RTPRIO
- Set thread scheduler tunables: POLICY and RTPRIO. POLICY is one of OTHER,
FIFO, RR, or BATCH. If -t is not set, -p will act as a
Modifier saving the sched tunables for future Actions, for example
-r.
- -P,
--show_threads
- Show thread list.
- -s,
--save=FILENAME
- Save kthreads sched tunables to FILENAME.
- -r,
--run="COMMAND"
- Run the COMMAND. If arguments are passed, the entire command line must be
provided inside "quotes". Modifiers -c and -p can
be used to set the affinity and scheduler tunables of the given COMMAND.
The arg[0] (i.e. the command) will be set in THREAD-LIST. Likewise the
-t, the COMMAND accepts the prefix + and - as
wildcards in order to be appended or removed from THREAD-LIST,
respectively.
- -v, --version
- Show version
- -W, --what_is
- Provides help about selected entities. Requires -t.
- -x, --spread
- Spread selected entities over CPU-LIST. Requires at least one of -t
or -q. The specified threads and IRQs are each assigned to one cpu
in CPU-LIST.
- Modifiers
- -c,
--cpus=CPU-LIST
- CPU-LIST affected by commands. Requires a CPU number or a comma-separated
list of CPU numbers.
- -C,
--affect_children
- Operation will affect children threads.
- -f, --filter
- Disable display of selected CPUs in --gui. Requires -c.
- -G, --cgroup
- Display the processes with the type of cgroups they are in. Requires
-P.
- -K,
--no_kthreads
- Operations will not affect kernel threads.
- -q,
--irqs=IRQ-LIST
- IRQ-LIST affected by commands. Requires an IRQ number or a comma-separated
list of IRQ numbers.
- -S,
--sockets=CPU-SOCKET-LIST
- CPU-SOCKET-LIST affected by commands. Requires a socket number or a
comma-separated list of socket numbers.
- -t,
--threads=THREAD-LIST
- THREAD-LIST affected by commands. Requires a thread number or thread name,
or a comma-separated list of thread numbers and/or names. Thread names may
contain wildcards. Be sure to quote or escape any wildcard specifications.
If only - is passed as argument, the THREAD-LIST will be
cleared.
- -U,
--no_uthreads
- Operations will not affect user threads.
If for instance the Ethernet NICs have multiple queues for both
receive and transmit, each with its own IRQ, the Ethernet IRQs can be
associated with a CPU socket:
- tuna -S 2 -i -q 'eth*'
-x
-
Move everything off the CPUs in socket 2, then spread the IRQs
for the Ethernet devices across those same CPUs.