MPSTAT(8) Maintenance Commands and Procedures MPSTAT(8)

mpstat — report per-processor or per-processor-set statistics

mpstat [-aq] [-p | -P set] [-T u | d] [interval [count]]

The mpstat command reports processor statistics in tabular form. Each row of the table represents the activity of one processor. The first table summarizes all activity since boot. Each subsequent table summarizes activity for the preceding interval. All values are rates listed as events per second unless otherwise noted.

During execution of the kernel status command, the state of the kernel can change. If relevant, a state change message is included in the mpstat output, in one of the following forms:

<<processor 3 moved from pset: -1 to: 1>>
<<pset destroyed: 1>>
<<pset created: 1>>
<<processors added: 1, 3>>
<<processors removed: 1, 3>>

The mpstat command reports the following information:

or SET
Without the -a option, mpstat reports CPU statistics for a processor ID. With the -a option, mpstat reports SET statistics for a processor set ID.
minor faults
major faults
inter-processor cross-calls
interrupts
interrupts as threads (not counting clock interrupt)
context switches
involuntary context switches
thread migrations (to another processor)
spins on mutexes (lock not acquired on first try)
spins on readers/writer locks (lock not acquired on first try)
system calls
percent user time
percent system time
the I/O wait time is no longer calculated as a percentage of CPU time, and this statistic will always return zero.
percent idle time
number of processors in the requested processor set
processor set membership of each CPU

The following options are supported:

Aggregate output by processor set. Sort the output by set. The default output is sorted by CPU number.
Report processor set membership of each CPU. Sort the output by set. The default output is sorted by CPU number.
set
Display only those processors in the specified set.
Suppress messages related to state changes.
u |
Specify u for a printed representation of the internal representation of time. See time(2). Specify d for standard date format. See date(1).
interval
Report once each interval seconds.
count
Only print count reports.

Using mpstat to Generate User and System Operation Statistics

The following command generates processor statistics over a five-second interval in two reports. The command shows the processor set membership of each CPU. The default output is sorted by CPU number, aggregated by , for user (usr) and system (sys) operations.

example% mpstat -ap 5 2

SET minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl sze
  0    6   0  355  291  190  22    0    0    0   0    43   0   2  0  43   1
  1   24  17  534  207  200  70    1    0    2   0   600   4   1  0  84   2
  2   19   7  353  325  318  44    0    0    5   0   345   1   1  0  94   3
  3   36   2  149  237  236  14    0    0    4   0    97   0   0  0  98   2
SET minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl sze
  0    1   0  720  405  304  55    0    0   18   0    12   0  15  0  81   1
  1    0  69 1955  230  200 313   33    4   41   9  7086  34  10  0  19   2
  2    0  46  685  314  300 203   11    0   54   1  5287  36   6  0  28   3
  3    0   0   14  386  384   0    0    0    0   0     0   0   0  0 100   2

The command line interface of mpstat is . The output of mpstat is and may change at any time.

date(1), sar(1), time(2), attributes(7), iostat(8), sar(8), vmstat(8)

The sum of CPU utilization might vary slightly from 100 due to rounding errors in the production of a percentage figure.

The total time used for CPU processing is the sum of usr and sys output values, reported for user and system operations. The idl value reports the time that the CPU is idle for any reason other than pending disk I/O operations.

Run the iostat(8) command with the -x option to report I/O service times in output. The iostat(8) utility also reports the same wt, user (), and system () statistics. See iostat(8) for more information.

When executing in a zone and if the pools facility is active, mpstat will only provide information for those processors which are a member of the processor set of the pool to which the zone is bound.

June 29, 2026 OmniOS