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 (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.
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
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 interrupts or softirqs.
%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 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.
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 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 supplied by the Linux kernel for each processor.
FILES
/proc
contains various files with system statistics.
