Проект OpenNet: MAN vmstat (1) Команды и прикладные программы пользовательского уровня (FreeBSD и Linux)

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vmstat (1)

>> vmstat (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )

vmstat (8) ( FreeBSD man: Команды системного администрирования )

vmstat (8) ( Linux man: Команды системного администрирования )

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:

<<device added: sd0>>
<<device removed: sd0>>
<<processors added: 1, 3>>
<<processors removed: 1, 3>>

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 This option is obsolete, and no longer meaningful.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.

-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:

count

: Specifies the number of times that the statistics 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:

: the number of kernel threads in run queue

: the number of blocked kernel threads that are waiting for resources I/O, paging, and so forth

: the number of swapped out lightweight processes (LWPs) that are waiting for processing 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.

: page reclaims --- but see the -S option for how this field is modified.

: minor faults --- but see the -S option for how this field is modified.

: kilobytes paged in

: kilobytes paged out

: kilobytes freed

: anticipated short-term memory shortfall (Kbytes)

: 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 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).

: interrupts

: system calls

: 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 processors.

: user time

: system time

: 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.