mpstat - Report processors related statistics.
mpstat [ -A ] [ --dec={ 0 | 1 | 2 } ] [ -n ] [ -u ] [ -T ] [ -V
] [ -I { keyword[,...] | ALL } ] [ -N { node_list
| ALL } ] [ -o JSON ] [ -P { cpu_list | ALL } ] [
interval [ count ] ]
The mpstat command writes to standard output activities for
each available processor, processor 0 being the first one. Global average
activities among all processors are also reported. The mpstat command
can be used on both SMP and UP machines, but in the latter, only global
average activities will be printed. If no activity has been selected, then
the default report is the CPU utilization report.
The interval parameter specifies the amount of time in
seconds between each report. A value of 0 (or no parameters at all)
indicates that processors statistics are to be reported for the time since
system startup (boot). The count parameter can be specified in
conjunction with the interval parameter if this one is not set to
zero. The value of count determines the number of reports generated
at interval seconds apart. If the interval parameter is
specified without the count parameter, the mpstat command
generates reports continuously.
- -A
- This option is equivalent to specifying -n -u -I ALL. This option
also implies specifying -N ALL -P ALL unless these options are
explicitly set on the command line.
- --dec={ 0 | 1 | 2
}
- Specify the number of decimal places to use (0 to 2, default value is
2).
- -I { keyword[,...]
| ALL }
- Report interrupts statistics. Possible keywords are CPU,
SCPU, and SUM.
With the
CPU keyword, the number of each
individual interrupt received per second by the CPU or CPUs is displayed.
Interrupts are those listed in
/proc/interrupts file.
With the SCPU keyword, the number of each individual
software interrupt received per second by the CPU or CPUs is displayed. This
option works only with kernels 2.6.31 and later. Software interrupts are
those listed in /proc/softirqs file.
With the SUM keyword, the mpstat command reports the
total number of interrupts per processor. The following values are
displayed:
- CPU
- Processor number. The keyword all indicates that statistics are
calculated as averages among all processors.
- intr/s
- Show the total number of interrupts received per second by the CPU or
CPUs.
- The ALL keyword is equivalent to specifying all the keywords above
and therefore all the interrupts statistics are displayed.
- -N { node_list |
ALL }
- Indicate the NUMA nodes for which statistics are to be reported.
node_list is a list of comma-separated values or range of values
(e.g., 0,2,4-7,12-). Note that node all is the global
average among all nodes. The ALL keyword indicates that statistics
are to be reported for all nodes.
- -n
- Report summary CPU statistics based on NUMA node placement. The following
values are displayed:
- NODE
- Logical NUMA node number. The keyword all indicates that statistics
are calculated as averages among all nodes.
- All the other fields are the same as those displayed with option -u
(see below).
- -o JSON
- Display the statistics in JSON (JavaScript Object Notation) format. JSON
output field order is undefined, and new fields may be added in the
future.
- -P { cpu_list | ALL
}
- Indicate the processors for which statistics are to be reported.
cpu_list is a list of comma-separated values or range of values
(e.g., 0,2,4-7,12-). Note that processor 0 is the first processor,
and processor all is the global average among all processors. The
ALL keyword indicates that statistics are to be reported for all
processors. Offline processors are not displayed.
- -T
- Display topology elements in the CPU report (see option -u below).
The following elements are displayed:
- CORE
- Logical core number.
- SOCK
- Logical socket number.
- NODE
- Logical NUMA node number.
- -u
- Report CPU utilization. The following values are displayed:
- CPU
- Processor number. The keyword all indicates that statistics are
calculated as averages among all processors.
- %usr
- Show the percentage of CPU utilization that occurred while executing at
the user level (application).
- %nice
- Show the percentage of CPU utilization that occurred while executing at
the user level with nice priority.
- %sys
- Show the percentage of CPU utilization that occurred while executing at
the system level (kernel). Note that this does not include time spent
servicing hardware and software interrupts.
- %iowait
- Show the percentage of time that the CPU or CPUs were idle during which
the system had an outstanding disk I/O request.
- %irq
- Show the percentage of time spent by the CPU or CPUs to service hardware
interrupts.
- %soft
- Show the percentage of time spent by the CPU or CPUs to service software
interrupts.
- %steal
- Show the percentage of time spent in involuntary wait by the virtual CPU
or CPUs while the hypervisor was servicing another virtual processor.
- %guest
- Show the percentage of time spent by the CPU or CPUs to run a virtual
processor.
- %gnice
- Show the percentage of time spent by the CPU or CPUs to run a niced
guest.
- %idle
- Show the percentage of time that the CPU or CPUs were idle and the system
did not have an outstanding disk I/O request.
- -V
- Print version number then exit.
The mpstat command takes into account the following
environment variable:
- S_COLORS
- By default statistics are displayed in color when the output is connected
to a terminal. Use this variable to change the settings. Possible values
for this variable are never, always or auto (the
latter is equivalent to the default settings).
Please note that the color (being red, yellow, or some other color) used to
display a value is not indicative of any kind of issue simply because of
the color. It only indicates different ranges of values.
- S_COLORS_SGR
- Specify the colors and other attributes used to display statistics on the
terminal. Its value is a colon-separated list of capabilities that
defaults to H=31;1:I=32;22:M=35;1:N=34;1:Z=34;22. Supported
capabilities are:
- H=
- SGR (Select Graphic Rendition) substring for percentage values greater
than or equal to 75%.
- I=
- SGR substring for CPU number.
- M=
- SGR substring for percentage values in the range from 50% to 75%.
- N=
- SGR substring for non-zero statistics values.
- Z=
- SGR substring for zero values.
- S_TIME_FORMAT
- If this variable exists and its value is ISO then the current
locale will be ignored when printing the date in the report header. The
mpstat command will use the ISO 8601 format (YYYY-MM-DD) instead.
The timestamp will also be compliant with ISO 8601 format.
- mpstat 2 5
- Display five reports of global statistics among all processors at two
second intervals.
- mpstat -P ALL 2
5
- Display five reports of statistics for all processors at two second
intervals.
/proc filesystem must be mounted for the mpstat
command to work.
/proc contains various files with system statistics.
Sebastien Godard (sysstat <at> orange.fr)