vmstat

Overview

isplays virtual memory statistics

Usage Guide

The statistics from this utility are averages since the last time it was run. If vmstat has not been since the system was started, it will report averages since start-up time.

When run without any parameters vmstat provides a standard report. The following parameters can be used for additional information:
-a display active/inactive memory
-f display the number of forks since boot
-m display slabinfo
-s display event counters and memory statistics

Reports from vmstat appears under these headings:
Procs
r     The number of processes waiting for run time.
b     The number of processes in uninterruptible sleep.
Memory
swpd     The amount of virtual memory used.
free     The amount of idle memory.
buff     The amount of memory used as buffers.
cache     The amount of memory used as cache.
inact     The amount of inactive memory. (-a option)
active     The amount of active memory. (-a option)
Swap
si     Amount of memory swapped in from disk (/s).
so     Amount of memory swapped to disk (/s).
IO
bi     Blocks received from a block device (blocks/s).
bo     Blocks sent to a block device (blocks/s).
System
in     The number of interrupts per second, including the clock.
cs     The number of context switches per second.
CPU
These are percentages of total CPU time.
us     Time spent running non-kernel code. (user time, including nice time)
sy     Time spent running kernel code. (system time)
id     Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time.
wa     Time spent waiting for IO. Prior to Linux 2.5.41, shown as zero.

Tool Data

Operating Platform:Linux
Diagnostic Target:OS - Memory Management
Tool Executable:vmstat
Obtain From:Included in the sysstat tools package. Available from most package managers (eg. apt, RPM, portage)

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