vmstat(1M)
NAME
vmstat - report virtual memory statistics
SYNOPSIS
vmstat [-cipsS] [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 this kernel status command, the "state"
of the kernel can change. An example would be CPUs going
online or offline. vmstat will report this as <<State
change>>.
See System Administration Guide: Advanced Administration for
device naming conventions for disks.
OPTIONS
The following options are supported:
-c Report cache flushing statistics. By default, report
the total number of each kind of cache flushed since
boot time. The types are: user, context, region, seg-
ment, page, and partial-page.
-i Report the number of interrupts per device. count and
interval does not apply to the -i option.
-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.
-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:
count Specifies the number of times that the statitics 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, followed 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:
r in run queue
b blocked for resources I/O, paging, and so
forth
w swapped
memory
Report on usage of virtual and real memory.
swap amount of swap space currently available
(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
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
cpu Give a breakdown of percentage usage of CPU time. On
MP systems, this is an average across all processors.
us user time
sy system time
id idle time
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
sar(1), iostat(1M), mpstat(1M), sar(1M), attributes(5)
System Administration Guide: Basic Administration
System Administration Guide: Advanced Administration
NOTES
The sum of CPU utilization might vary slightly from 100
because of rounding errors in the production of a percentage
figure.
Man(1) output converted with
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