VMSTAT(8)	    Linux Programmer's Manual		VMSTAT(8)
NAME
       vmstat - Report virtual memory statistics
SYNOPSIS
       vmstat [-n] [delay [ count]]
       vmstat[-V]
DESCRIPTION
       vmstat  reports	information about processes, memory, pag-
       ing, block IO, traps, and cpu activity.

       The first report produced gives averages	 since	the  last
       reboot.	Additional reports give information on a sampling
       period of length delay.	The process  and  memory  reports
       are instantaneous in either case.

   Options
       The -n switch  causes the header to be displayed only once
       rather than periodically.

       delay is the delay between  updates  in	seconds.   If  no
       delay  is  specified,  only one report is printed with the
       average values since boot.

       count is the number of updates.	If no count is	specified
       and delay is defined, count defaults to infinity.

       The -V switch results in displaying version information.

FIELD DESCRIPTIONS
   Procs
       r: The number of processes waiting for run time.
       b: The number of processes in uninterruptable sleep.
       w: The number of processes swapped out but otherwise runnable.  This
	  field is calculated, but Linux never desperation swaps.

   Memory
       swpd: the amount of virtual memory used (kB).
       free: the amount of idle memory (kB).
       buff: the amount of memory used as buffers (kB).

   Swap
       si: Amount of memory swapped in from disk (kB/s).
       so: Amount of memory swapped to disk (kB/s).

   IO
       bi: Blocks sent to a block device (blocks/s).
       bo: Blocks received from a block device (blocks/s).

Throatwobbler Ginkgo Labs 27 July 1994				1
VMSTAT(8)	    Linux Programmer's Manual		VMSTAT(8)

   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: user time
       sy: system time
       id: idle time

NOTES
       vmstat does not require special permissions.

       These reports are intended to help identify system bottle-
       necks.  Linux vmstat does not count itself  as  a  running process.

       All  linux  blocks  are	currently  1k,	except for CD-ROM
       blocks which are 2k.

FILES
       /proc/meminfo
       /proc/stat
       /proc/*/stat

SEE ALSO
       ps(1), top(1), free(1)

BUGS
       Does not tabulate the block io per  device  or  count  the
       number of system calls.
AUTHOR
       Written by Henry Ware .