222 lines
6.0 KiB
Groff
222 lines
6.0 KiB
Groff
.\" $OpenBSD: vmstat.8,v 1.40 2019/12/06 19:15:16 jmc Exp $
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.\" $NetBSD: vmstat.8,v 1.12 1996/05/10 23:19:30 thorpej Exp $
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.\"
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.\" 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. 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 $Mdocdate: December 6 2019 $
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.Dt VMSTAT 8
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.Os
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.Sh NAME
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.Nm vmstat
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.Nd report statistics about kernel activities
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.Sh SYNOPSIS
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.Nm vmstat
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.Op Fl fimstvz
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.Nm vmstat
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.Op Fl c Ar count
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.Op Fl M Ar core
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.Op Fl N Ar system
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.Op Fl w Ar wait
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.Op Ar disk ...
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.Sh DESCRIPTION
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.Nm
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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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The default behavior is to print a one-line summary of these statistics.
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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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flags may be used to continually report summaries.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl c Ar count
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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 of
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.Xr fork 2 ,
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.Xr __tfork 3 ,
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and
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.Xr vfork 2
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system calls as well as kernel thread creations since system startup,
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and the number of pages of virtual memory 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 Ar core
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Extract values associated with the name list from the specified core
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instead of the running 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 N Ar system
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Extract the name list from the specified system instead of the running kernel.
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.It Fl s
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Display the contents of the
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.Va uvmexp
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structure (see
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.Xr uvm_init 9 ) ,
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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 v
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Print more verbose information.
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.It Fl w Ar wait
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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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.It Fl z
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When used with
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.Fl i ,
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also list devices which have not yet generated an interrupt.
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.El
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.Pp
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By default,
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.Nm
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displays the following information just once:
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.Bl -tag -width Ds
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.It Li 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 4n -compact
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.It Li r
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in run queue
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.It Li s
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sleeping
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.El
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.It Li memory
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Information about the usage of virtual and real memory.
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.Pp
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.Bl -tag -width 4n -compact
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.It Li avm
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active virtual pages
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.It Li fre
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size of the free list
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.El
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.It Li 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 4n -compact
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.It Li flt
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page faults
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.It Li re
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page reclaims (simulating reference bits)
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.It Li pi
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pages paged in
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.It Li po
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pages paged out
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.It Li fr
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pages freed
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.It Li sr
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pages scanned by clock algorithm
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.El
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.It Li disks
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Disk transfers per second.
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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 two disk drives are configured in the system,
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.Nm
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displays only the first two drives.
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To force
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.Nm
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to display specific drives, their names may be supplied on the command line.
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.It Li traps
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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 4n -compact
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.It Li int
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device interrupts per interval (including clock interrupts)
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.It Li sys
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system calls per interval
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.It Li cs
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CPU context switch rate (switches/interval)
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.El
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.It Li cpu
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Breakdown of percentage usage of CPU time.
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.Pp
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.Bl -tag -width 4n -compact
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.It Li us
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user time for normal and low priority processes
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.It Li sy
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system time
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.It Li id
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CPU idle
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.El
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.El
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.Sh FILES
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.Bl -tag -width Pa -compact
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.It Pa /bsd
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default kernel image
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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 EXAMPLES
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The command
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.Ic 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 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 procmap 1 ,
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.Xr ps 1 ,
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.Xr systat 1 ,
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.Xr top 1 ,
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.Xr iostat 8 ,
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.Xr pstat 8 ,
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.Xr uvm_init 9
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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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.Pp
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This manual page lacks an incredible amount of detail.
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