mpstat - Report processors related statistics.
SYNOPSIS
mpstat [ -P { cpu | 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.
The interval parameter specifies the amount of time in
seconds between each report. A value of 0 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 continu
ously.
REPORTS
The report generated by the mpstat command has the follow
ing 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 executing at the user level (appli
cation).
%nice
Show the percentage of CPU utilization that
occurred while executing at the user level with
nice priority.
%system
Show the percentage of CPU utilization that
occurred while executing at the system level (ker
nel).
%idle
Show the percentage of time that the CPU or CPUs
were idle.
intr/s
Show the total number of interrupts received per
second by the CPU or CPUs.
-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 and usage then exit.
ENVIRONMENT
The mpstat command takes into account the following envi
ronment 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 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 proces
sors at two second intervals.
BUGS
/proc filesystem must be mounted for the mpstat command to
work.
Only a few activities are supplied by the Linux kernel for
each processor.
FILES
/proc contains various files with system statistics.
AUTHOR
Sebastien Godard <sebastien.godard@wanadoo.fr>
SEE ALSO
sar(1), sadc(8), sa1(8), sa2(8), iostat(1), vmstat(8)
http://perso.wanadoo.fr/sebastien.godard/
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