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

NAME
mpstat - Report processors related statistics.

SYNOPSIS
mpstat [ -A ] [ -n ] [ -u ] [ -V ] [ -I { keyword [,...] | ALL } ] [ -N { node_list | ALL
} ] [ -o JSON ] [ -P { cpu_list | ON | ALL } ] [ interval [ count ] ]

DESCRIPTION
The mpstat command writes to standard output activities for each available processor, pro-
cessor 0 being the first one. Global average activities 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 inter-
val parameter is specified without the count parameter, the mpstat command generates
reports continuously.

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

-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 sta-
tistics are to be reported for all nodes.

-n Report summary CPU statistics based on NUMA node placement. The following values
are displayed:

NODE
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 | ON | 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 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 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 pro-
cessor.

%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 activity at all is a dis-
abled (offline) processor.

-V Print version number then exit.

ENVIRONMENT
The mpstat command takes into account the following environment variable:

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 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.

EXAMPLES
mpstat 2 5
Display five reports of global statistics among all processors at two second inter-
vals.

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 <at> orange.fr)

SEE ALSO
sar(1), pidstat(1), iostat(1), vmstat(8)

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

Linux MAY 2017 MPSTAT(1)

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