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RedHat 9 (Linux i386) - man page for vmstat (redhat section 8)

VMSTAT(8)			   Linux Administrator's Manual 			VMSTAT(8)

NAME
       vmstat - Report virtual memory statistics

SYNOPSIS
       vmstat [-n] [delay [ count]]
       vmstat[-V]

DESCRIPTION
       vmstat  reports	information  about  processes,	memory,  paging, 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).

   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 bottlenecks.	 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 <al172@yfn.ysu.edu>.

Throatwobbler Ginkgo Labs		  27 July 1994					VMSTAT(8)


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