Vmstat

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vmstat (virtual memory statistics) is a computer operating system monitoring tool that collects and displays summary information about memory, processes, interrupts, paging and block io information. By specifying the interval, it can be used to observe system activity interactively.

The vmstat tool is available on most UNIX operating systems, as well as other non-UNIX operating systems such as Linux. The syntax and output of vmstat often differs slightly between different operating systems.

Example:

#> 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
#>

Vmstat

See also