![]() | This article includes a
list of references,
related reading, or
external links, but its sources remain unclear because it lacks
inline citations. (July 2022) |
Developer(s) | AT&T Bell Laboratories |
---|---|
Initial release | February 1985 |
Operating system | Unix and Unix-like |
Type | Command |
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.
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.
# vmstat –s
# vmstat –d
![]() | This article includes a
list of references,
related reading, or
external links, but its sources remain unclear because it lacks
inline citations. (July 2022) |
Developer(s) | AT&T Bell Laboratories |
---|---|
Initial release | February 1985 |
Operating system | Unix and Unix-like |
Type | Command |
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.
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.
# vmstat –s
# vmstat –d