System Administration Commands vmstat(1M)
NAME
vmstat - report virtual memory statistics
SYNOPSIS
vmstat [-cipqsS] [disks] [interval [count]
DESCRIPTION
vmstat reports virtual memory statistics regarding kernel
thread, virtual memory, disk, trap, and CPU activity.
On MP (multi-processor) systems, vmstat averages the number
of CPUs into the output. For per-processor statistics, see
mpstat(1M).
vmstat only supports statistics for certain devices. For
more general system statistics, use sar(1), iostat(1M), or
sar(1M).
Without options, vmstat displays a one-line summary of the
virtual memory activity since the system was booted.
During execution of the kernel status command, the state of
the system can change. If relevant, a state change message
is included in the vmstat output, in one of the following
forms:
<>
<>
<>
<>
See for device naming conventions for disks.
OPTIONS
The following options are supported:
-c Report cache flushing statistics. This option is
obsolete, and no longer meaningful. This option might
be removed in a future version of Solaris.
-i Report the number of interrupts per device. count and
interval does not apply to the -i option.
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System Administration Commands vmstat(1M)
-p Report paging activity in details. This option will
display the following, respectively:
epi Executable page-ins.
epo Executable page-outs.
epf Executable page-frees.
api Anonymous page-ins.
apo Anonymous page-outs.
apf Anonymous page-frees.
fpi File system page-ins.
fpo File system page-outs.
fpf File system page-frees.
When executed in a zone and if the pools facility is
active, all of the above only report actitivity on the
processors in the processor set of the zone's pool.
-q Suppress messages related to state changes.
-s Display the total number of various system events
since boot. count and interval does not apply to the
-s option.
-S Report on swapping rather than paging activity. This
option will change two fields in vmstat's ``paging''
display: rather than the ``re'' and ``mf'' fields,
vmstat will report ``si'' (swap-ins) and ``so''
(swap-outs).
OPERANDS
The following operands are supported:
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System Administration Commands vmstat(1M)
count Specifies the number of times that the statis-
tics are repeated. count does not apply to the
-i and -s options.
disks Specifies which disks are to be given priority
in the output (only four disks fit on a line).
Common disk names are id, sd, xd, or xy, fol-
lowed by a number (for example, sd2, xd0, and so
forth).
interval Specifies the last number of seconds over which
vmstat summarizes activity. This number of
seconds repeats forever. interval does not apply
to the -i and -s options.
EXAMPLES
Example 1 Using vmstat
The following command displays a summary of what the system
is doing every five seconds.
example% vmstat 5
kthr memory page disk faults cpu
r b w swap free re mf pi p fr de sr s0 s1 s2 s3 in sy cs us sy id
0 0 0 11456 4120 1 41 19 1 3 0 2 0 4 0 0 48 112 130 4 14 82
0 0 1 10132 4280 0 4 44 0 0 0 0 0 23 0 0 211 230 144 3 35 62
0 0 1 10132 4616 0 0 20 0 0 0 0 0 19 0 0 150 172 146 3 33 64
0 0 1 10132 5292 0 0 9 0 0 0 0 0 21 0 0 165 105 130 1 21 78
1 1 1 10132 5496 0 0 5 0 0 0 0 0 23 0 0 183 92 134 1 20 79
1 0 1 10132 5564 0 0 25 0 0 0 0 0 18 0 0 131 231 116 4 34 62
1 0 1 10124 5412 0 0 37 0 0 0 0 0 22 0 0 166 179 118 1 33 67
1 0 1 10124 5236 0 0 24 0 0 0 0 0 14 0 0 109 243 113 4 56 39
^C
example%
The fields of vmstat's display are
kthr Report the number of kernel threads in each of the
three following states:
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System Administration Commands vmstat(1M)
r the number of kernel threads in run queue
b the number of blocked kernel threads that are
waiting for resources I/O, paging, and so
forth
w the number of swapped out lightweight
processes (LWPs) that are waiting for pro-
cessing resources to finish.
memory Report on usage of virtual and real memory.
swap available swap space (Kbytes)
free size of the free list (Kbytes)
page Report information about page faults and paging
activity. The information on each of the following
activities is given in units per second.
re page reclaims - but see the -S option for
how this field is modified.
mf minor faults - but see the -S option for how
this field is modified.
pi kilobytes paged in
po kilobytes paged out
fr kilobytes freed
de anticipated short-term memory shortfall
(Kbytes)
sr pages scanned by clock algorithm
When executed in a zone and if the pools facility
is active, all of the above (except for "de") only
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System Administration Commands vmstat(1M)
report activity on the processors in the processor
set of the zone's pool.
disk Report the number of disk operations per second.
There are slots for up to four disks, labeled with
a single letter and number. The letter indicates
the type of disk (s = SCSI, i = IPI, and so
forth); the number is the logical unit number.
faults Report the trap/interrupt rates (per second).
in interrupts
sy system calls
cs CPU context switches
When executed in a zone and if the pools facility
is active, all of the above only report actitivity
on the processors in the processor set of the
zone's pool.
cpu Give a breakdown of percentage usage of CPU time.
On MP systems, this is an average across all pro-
cessors.
us user time
sy system time
id idle time
When executed in a zone and if the pools facility
is active, all of the above only report actitivity
on the processors in the processor set of the
zone's pool.
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
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System Administration Commands vmstat(1M)
ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWcsu
Interface Stability See below.
Invocation is evolving. Human readable output is unstable.
SEE ALSO
sar(1), iostat(1M), mpstat(1M), sar(1M), attributes(5)
NOTES
The sum of CPU utilization might vary slightly from 100
because of rounding errors in the production of a percentage
figure.
The -c option (Report cache flushing statistics) is not sup-
ported in this release.
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