Ubuntu Manpage: mpstat - Report processors related statistics.

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,
       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 -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. 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 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.

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.

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
              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 <at> orange.fr)