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((Short description|Computer system monitoring tool))
((lowercase|title=vmstat))
((No footnotes|date=July 2022))
((unref |date=March 2024))
((Infobox Software 
| name                   = vmstat
| logo                   = 
| screenshot             = 
| screenshot size        = 
| caption                = 
| author                 = 
| developer              = [[AT&T Bell Laboratories]]
| released               = ((Start date and age|1985|2))
| latest release version = 
| latest release date    = 
| operating system       = [[Unix]] and [[Unix-like]]
| genre                  = [[Command (computing)|Command]]
| license                = 
| website                = 
))
'''vmstat''' ('''''v'''irtual '''m'''emory '''stat'''istics'') is a computer [[system monitor]]ing tool that collects and displays summary information about [[operating system]] memory, processes, interrupts, paging and block [[Input/output|I/O]]. Users of <code>vmstat</code> can specify a sampling interval which permits observing system activity in near-real time.

The vmstat tool is available on most [[Unix]] and [[Unix-like]] operating systems, such as [[FreeBSD]], [[Linux]] or [[Solaris (operating system)|Solaris]].

==Syntax==
The syntax and output of vmstat often differs slightly between different operating systems.

<syntaxhighlight lang="console">
# vmstat 2 6
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0   2536  21496 185684 1353000    0    0     0    14    1     2  0  0 100  0
 0  0   2536  21496 185684 1353000    0    0     0    28 1030   145  0  0 100  0
 0  0   2536  21496 185684 1353000    0    0     0     0 1026   132  0  0 100  0
 0  0   2536  21520 185684 1353000    0    0     0     0 1033   186  1  0 99  0
 0  0   2536  21520 185684 1353000    0    0     0     0 1024   141  0  0 100  0
 0  0   2536  21584 185684 1353000    0    0     0     0 1025   131  0  0 100  0
</syntaxhighlight>

In the above example the tool reports every two seconds for six iterations.

We can get the customized or required outputs by using various options with the vmstat command.

;<syntaxhighlight lang="console" inline># vmstat –s</syntaxhighlight>:     This option is used to get ''memory statistics''.

;<syntaxhighlight lang="console" inline># vmstat –d</syntaxhighlight>:     This option is used to get ''disk statistics''.

== See also ==
* [[nmon]] &mdash; a system monitor tool for the AIX and Linux operating systems.
* [[iostat]]
* [[top (software)|top]]
* [[sar (Unix)|sar]]

== External links ==
* ((man|8|vmstat|FreeBSD))
* ((man|8|vmstat|Solaris))
* ((man|8|vmstat|die.net|Report virtual memory statistics))
* [http://www.softpanorama.org/Utilities/vmstat.shtml  Softpanorama vmstat page]

[[Category:Unix software]]
[[Category:System monitors]]


((Software-stub))

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Vmstat (edit)
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