System Administration Commands mpstat(1M)
NAME
mpstat - report per-processor or per-processor-set statis-
tics
SYNOPSIS
/usr/bin/mpstat [-aq] [-p | -P set] [interval [count]]
DESCRIPTION
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:
CPU 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.
minf minor faults
mjf major faults
xcal inter-processor cross-calls
intr interrupts
ithr interrupts as threads (not counting clock
interrupt)
csw context switches
icsw involuntary context switches
migr thread migrations (to another processor)
smtx spins on mutexes (lock not acquired on first
try)
srw spins on readers/writer locks (lock not
acquired on first try)
syscl system calls
usr percent user time
sys percent system time
wt time CPUs are idle pending I/O operations.
See the NOTES section for more information
on wt time.
idl percent idle time
sze number of processors in the requested pro-
cessor set
set processor set membership of each CPU
OPTIONS
The following options are supported:
-a Aggregate output by processor set. Sort the
output by set. The default output is sorted
by CPU number.
-p Report processor set membership of each CPU.
Sort the output by set. The default output
is sorted by CPU number.
-P set Display only those processors in the speci-
fied set.
-q Suppress messages related to state changes.
interval Report once each interval seconds.
count Only print count reports.
EXAMPLES
Example 1: Using mpstat to Generate User and System Opera-
tion 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 processor set, for user
(usr) and system (sys) operations. See the NOTES section for
more information on wt time.
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 55 43 1
1 24 17 534 207 200 70 1 0 2 0 600 4 1 11 84 2
2 19 7 353 325 318 44 0 0 5 0 345 1 1 4 94 3
3 36 2 149 237 236 14 0 0 4 0 97 0 0 1 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 4 81 1
1 0 69 1955 230 200 313 33 4 41 9 7086 34 10 37 19 2
2 0 46 685 314 300 203 11 0 54 1 5287 36 6 30 28 3
3 0 0 14 386 384 0 0 0 0 0 0 0 0 0 100 2
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
| Interface Stability | See below. |
|_____________________________|_____________________________|
Invocation is evolving. Human readable output is unstable.
SEE ALSO
sar(1), iostat(1M), sar(1M), vmstat(1M), attributes(5)
NOTES
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 wt value reports the time that processors are idle pend-
ing I/O operations. The idl value reports the time that the
CPU is idle for any reason other than pending disk I/O
operations. The total amount of idle CPU time is, therefore,
the sum of wt and idl output values.
High wt times indicate problems in the disk subsystem, not
problems with CPUs or other processing elements. Excessive
wt times must be addressed by improving the performance,
especially the service times, of the busiest disk devices.
Run the iostat command with the -x option to report I/O ser-
vice times in svc_t output. The iostat utility also reports
the same wt, user (us), and system (sy) statistics. See
iostat(1M) for more information.
When executing in a zone and if the pools facility is
active, mpstat(1M) will only provide information for those
processors which are a member of the processor set of the
pool to which the zone is bound.
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