218 lines
6.1 KiB
Groff
218 lines
6.1 KiB
Groff
.\" Copyright (c) 1986, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)vmstat.8 8.1 (Berkeley) 6/6/93
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.\"
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.Dd June 6, 1996
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.Dt VMSTAT 8
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.Os BSD 4
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.Sh NAME
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.Nm vmstat
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.Nd report virtual memory statistics
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.Sh SYNOPSIS
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.Nm vmstat
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.Op Fl fimst
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.Op Fl c Ar count
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.Op Fl M core
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.Op Fl N system
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.Op Fl w wait
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.Op Ar disks
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.Sh DESCRIPTION
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.Nm Vmstat
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reports certain kernel statistics kept about process, virtual memory,
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disk, trap and cpu activity.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl c
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Repeat the display
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.Ar count
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times.
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The first display is for the time since a reboot and each subsequent report
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is for the time period since the last display.
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If no
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.Ar wait
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interval is specified, the default is 1 second.
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.It Fl f
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Report on the number
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.Xr fork 2
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and
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.Xr vfork 2
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system calls since system startup, and the number of pages of virtual memory
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involved in each.
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.It Fl i
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Report on the number of interrupts taken by each device since system
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startup.
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.It Fl M
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Extract values associated with the name list from the specified
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.Ar core
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instead of the default
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.Pa /dev/kmem .
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.It Fl N
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Extract the name list from the specified
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.Ar system
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instead of the default
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.Pa /kernel .
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.It Fl m
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Report on the usage of kernel dynamic memory listed first by size of
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allocation and then by type of usage.
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.It Fl s
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Display the contents of the
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.Em sum
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structure, giving the total number of several kinds of paging related
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events which have occurred since system startup.
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.It Fl t
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Report on the number of page in and page reclaims since system startup,
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and the amount of time required by each.
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.It Fl w
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Pause
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.Ar wait
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seconds between each display.
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If no repeat
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.Ar count
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is specified, the default is infinity.
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.El
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.Pp
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By default,
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.Nm vmstat
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displays the following information:
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.Pp
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.Bl -tag -width indent
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.It procs
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Information about the numbers of processes in various states.
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.Pp
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.Bl -tag -width indent -compact
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.It r
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in run queue
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.It b
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blocked for resources (i/o, paging, etc.)
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.It w
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runnable or short sleeper (< 20 secs) but swapped
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.El
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.It memory
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Information about the usage of virtual and real memory.
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Virtual pages (reported in units of 1024 bytes) are considered active if
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they belong to processes which are running or have run in the last 20
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seconds.
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.Pp
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.Bl -tag -width indent -compact
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.It avm
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active virtual pages
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.It fre
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size of the free list
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.El
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.It page
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Information about page faults and paging activity.
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These are averaged each five seconds, and given in units per second.
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.Pp
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.Bl -tag -width indent -compact
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.It re
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page reclaims (simulating reference bits)
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.It at
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pages attached (found in free list)
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.It pi
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pages paged in
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.It po
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pages paged out
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.It fr
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pages freed per second
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.It de
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anticipated short term memory shortfall
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.It sr
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pages scanned by clock algorithm, per-second
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.El
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.It disks
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Disk operations per second (this field is system dependent).
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Typically paging will be split across the available drives.
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The header of the field is the first character of the disk name and
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the unit number.
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If more than four disk drives are configured in the system,
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.Nm vmstat
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displays only the first four drives.
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To force
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.Nm vmstat
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to display specific drives, their names may be supplied on the command line.
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.It faults
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Trap/interrupt rate averages per second over last 5 seconds.
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.Pp
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.Bl -tag -width indent -compact
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.It in
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device interrupts per interval (including clock interrupts)
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.It sy
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system calls per interval
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.It cs
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cpu context switch rate (switches/interval)
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.El
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.It cpu
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Breakdown of percentage usage of CPU time.
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.Pp
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.Bl -tag -width indent -compact
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.It us
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user time for normal and low priority processes
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.It sy
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system time
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.It id
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cpu idle
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.El
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.El
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.Sh EXAMPLES
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The command:
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.Dl vmstat -w 5
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will print what the system is doing every five
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seconds; this is a good choice of printing interval since this is how often
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some of the statistics are sampled in the system.
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Others vary every second and running the output for a while will make it
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apparent which are recomputed every second.
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.Sh FILES
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.Bl -tag -width /dev/kmemxxx -compact
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.It Pa /kernel
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default kernel namelist
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.It Pa /dev/kmem
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default memory file
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.El
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.Sh SEE ALSO
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.Xr fstat 1 ,
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.Xr netstat 1 ,
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.Xr nfsstat 1 ,
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.Xr ps 1 ,
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.Xr systat 1 ,
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.Xr iostat 8 ,
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.Xr pstat 8
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.Pp
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The sections starting with ``Interpreting system activity'' in
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.%T "Installing and Operating 4.3BSD" .
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.SH BUGS
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The
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.Fl c
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and
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.Fl w
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options are only available with the default output.
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