VMSTAT(8) VMSTAT(8)
NAME
vmstat - report virtual memory statistics
SYNOPSIS
vmstat [ -st ] [ interval [ count ] ]
DESCRIPTION
Vmstat reports statistics about certain system activity.
Option -s prints totals for miscellaneous events since the
last boot. Option -t reports on paging events.
In the absence of other options, the optional interval argu-
ment causes vmstat to report once each interval seconds,
repeated count times or forever.
The default format fields are:
procs information about numbers of processes in various
states:
r in run queue
b blocked for resources (I/O, paging, etc.)
w runnable or short sleeper (< 20 secs) but
swapped
memory use of virtual and real memory:
avm number of pages belonging to processes that
have run in the last 20 seconds
fre size of memory free list
page paging activity, averaged each five seconds, in
units per second:
re page reclaims (simulating reference bits)
at text pages recovered from memory
pi page-in events
po page-out events
fr pages freed per second
de anticipated short term memory shortfall
sr scan rate: pageout daemon rpm
faults trap rates, averaged each five seconds, in units per
second:
sy system calls
cs process context switches
cpu percentage use of CPU time:
us user time, both normal and low priority
sy system time
id cpu idle time
st stream queue processing time
VMSTAT(8) VMSTAT(8)
FILES
BUGS
This program is never up to date.