MPSTAT(1) Linux User's Manual MPSTAT(1)NAMEmpstat - Report processors related statistics.
SYNOPSISmpstat [ -P { cpu | ALL } ] [ -V ] [ 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.
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.
REPORTS
The report generated by the mpstat command has the following format:
CPU
Processor number. The keyword all indicates that statistics are
calculated as averages among all processors.
%user
Show the percentage of CPU utilization that occurred while exe‐
cuting at the user level (application).
%nice
Show the percentage of CPU utilization that occurred while exe‐
cuting at the user level with nice priority.
%sys
Show the percentage of CPU utilization that occurred while exe‐
cuting at the system level (kernel). Note that this does not
include time spent servicing interrupts or softirqs.
%iowait
Show the percentage of time that the CPU or CPUs were idle dur‐
ing which the system had an outstanding disk I/O request.
%irq
Show the percentage of time spent by the CPU or CPUs to service
interrupts.
%soft
Show the percentage of time spent by the CPU or CPUs to service
softirqs. A softirq (software interrupt) is one of up to 32
enumerated software interrupts which can run on multiple CPUs at
once.
%steal
Show the percentage of time spent in involuntary wait by the
virtual CPU or CPUs while the hypervisor was servicing another
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.
intr/s
Show the total number of interrupts received per second by the
CPU or CPUs.
Note: On SMP machines a processor that does not have any activity at
all is a disabled (offline) processor.
OPTIONS-P { cpu | 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 ALL keyword indicates that statistics
are to be reported for all processors.
-V Print version number then exit.
ENVIRONMENT
The mpstat command takes into account the following environment vari‐
able:
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.
EXAMPLESmpstat 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.
On SMP machines mpstat assumes that CPU #0 is never disabled. Indeed
mpstat uses it to calculate the time interval.
Only a few activities are supplied by the Linux kernel for each proces‐
sor.
FILES
/proc contains various files with system statistics.
AUTHOR
Sebastien Godard (sysstat <at> wanadoo.fr)
SEE ALSOsar(1), sadc(8), sa1(8), sa2(8), sadf(1), iostat(1), vmstat(8)
http://perso.orange.fr/sebastien.godard/
Linux OCTOBER 2006 MPSTAT(1)
