Linux/Unix mpstat command

Linux/Unix mpstat command

NAME

mpstat - Report processors related statistics.

SYNOPSIS

mpstat [ -A ] [ -I { SUM | CPU | ALL } ] [ -u ] [ -P { cpu [,...] | ON | ALL } ] [ -V ] [ interval [ count ] ]

DESCRIPTION

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  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 parameter,

the mpstat command generates reports continuously.

OPTIONS

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

-I { SUM | CPU | ALL }

Report interrupts statistics.

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.

With the CPU keyword, the number of each individual interrupt received per second by the CPU or CPUs is displayed.

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  pro-

cessor  0  is the first processor.  The ON keyword indicates that statistics are to be reported for every online pro-

cessor, 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 ser-

vicing another virtual processor.

%guest

Show the percentage of time spent by the CPU or CPUs to run a virtual processor.

%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 disabled (offline) processor.

-V     Print version number then exit.

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.

[root@netqh110 ~]# cat /proc/cpuinfo |grep -i processor | head -n 5    #check logical cpu

processor       : 0

processor       : 1

processor       : 2

processor       : 3

processor       : 4

[root@netqh110 ~]# mpstat -P 0        #check special cpu related statistics which you defined.

Linux 2.6.32-279.el6.x86_64 (netqh110.qrow-finity.com)       07/31/2012      _x86_64_        (32 CPU)

01:40:41 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest   %idle

01:40:41 PM    0    0.33    0.00    0.21    0.01    0.00    0.02    0.00    0.00   99.42

[root@netqh110 ~]# mpstat -P 1

Linux 2.6.32-279.el6.x86_64 (netqh110.qrow-finity.com)       07/31/2012      _x86_64_        (32 CPU)

01:40:46 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest   %idle

01:40:46 PM    1    0.09    0.00    0.09    0.00    0.00    0.01    0.00    0.00   99.81

[root@netqh110 ~]# mpstat -P ALL

Linux 2.6.32-279.el6.x86_64 (netqh110.qrow-finity.com)       07/31/2012      _x86_64_        (32 CPU)

01:43:59 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest   %idle

01:43:59 PM  all    0.07    0.00    0.10    0.00    0.00    0.00    0.00    0.00   99.83

01:43:59 PM    0    0.33    0.00    0.21    0.01    0.00    0.02    0.00    0.00   99.42

01:43:59 PM    1    0.09    0.00    0.09    0.00    0.00    0.01    0.00    0.00   99.81

01:43:59 PM    2    0.03    0.00    0.02    0.00    0.00    0.00    0.00    0.00   99.95

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