vmstat
{{Short description|Computer system monitoring tool}}
{{lowercase|title=vmstat}}
{{No footnotes|date=July 2022}}
{{unref |date=March 2024}}
{{Infobox Software
| name = vmstat
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| developer = AT&T Bell Laboratories
| released = {{Start date and age|1985|2}}
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| operating system = Unix and Unix-like
| genre = Command
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vmstat (virtual memory statistics) is a computer system monitoring tool that collects and displays summary information about operating system memory, processes, interrupts, paging and block I/O. Users of vmstat 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.
Syntax
The syntax and output of vmstat often differs slightly between different operating systems.
- 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
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.
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See also
References
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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]
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