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

NAME
       mpstat - Report processors related statistics.

SYNOPSIS
       mpstat [ -A ] [ -u ] [ -V ] [ -I { SUM | CPU | SCPU | ALL } ] [ -P { cpu [,...] | 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 -u -I ALL -P ALL

       -I { SUM | CPU | SCPU | 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.

	      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.

	      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 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_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 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					  SEPTEMBER 2012				MPSTAT(1)
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