mpstat Man page

MPSTAT(1) Linux User’s Manual MPSTAT(1)

NAME

mpstat – Report processors related statistics.

SYNOPSIS

mpstat [ -A ] [ -u ] [ -V ] [ -I { keyword [,…] | ALL } ] [ -P { cpu
[,…] | ON | ALL } ] [ interval [ count ] ]

DESCRIPTION

The mpstat command writes to standard output activities for each avail‐
able processor, processor 0 being the first one. Global average activ‐
ities among all processors are also reported. The mpstat command can
be used both on 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 parame‐
ter, the mpstat command generates reports continuously.

OPTIONS

-A This option is equivalent to specifying -u -I ALL -P ALL

-I { keyword [,…] | ALL }
Report interrupts statistics.

Possible keywords are SUM, CPU and SCPU.

With the SUM keyword, the mpstat command reports the total num‐
ber of interrupts per processor. The following values are dis‐
played:

CPU
Processor number. The keyword all indicates that statis‐
tics are calculated as averages among all processors.

intr/s
Show the total number of interrupts received per second
by the CPU or CPUs.

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.

The ALL keyword is equivalent to specifying all the keywords
above and therefore all the interrupts statistics are displayed.

-P { cpu [,…] | ON | ALL }
Indicate the processor number for which statistics are to be
reported. cpu is the processor number. Note that processor 0 is
the first processor. The ON keyword indicates that statistics
are to be reported for every online processor, whereas the ALL
keyword indicates that statistics are to be reported for all
processors.

-u Report CPU utilization. The following values are displayed:

CPU
Processor number. The keyword all indicates that statis‐
tics 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 servic‐
ing 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.

Note: On SMP machines a processor that does not have any activ‐
ity at all is a disabled (offline) processor.

-V Print version number then exit.

ENVIRONMENT
The mpstat command takes into account the following environment vari‐
able:

S_COLORS
When this variable is set, display statistics in color on the
terminal. Possible values for this variable are never, always
or auto (the latter is the default).

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 statis‐
tics on the terminal. Its value is a colon-separated list of
capabilities that defaults to
H=31;1:I=32;22:M=34;1:N=33;1:Z=33;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.

EXAMPLES
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.

BUGS

/proc filesystem must be mounted for the mpstat command to work.

Only a few activities are given by the Linux kernel for each processor.

FILES
/proc contains various files with system statistics.

AUTHOR

Sebastien Godard (sysstat orange.fr)

SEE ALSO

sar, pidstat, iostat, vmstat(8)

http://pagesperso-orange.fr/sebastien.godard/

Linux NOVEMBER 2015 MPSTAT(1)