1994-05-27 12:33:43 +00:00
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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. 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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1994-12-12 00:26:08 +00:00
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.TH VMSTAT 8 "June 6, 1993"
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1994-05-27 12:33:43 +00:00
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.UC 4
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.SH NAME
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vmstat \- report virtual memory statistics
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.SH SYNOPSIS
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.nf
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.ft B
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vmstat [ \-fimst ] [ \-c count ] [ \-M core ] [ \-N system ]
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.ti +5
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[ \-w wait ] [ disks ]
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.ft R
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.fi
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.SH DESCRIPTION
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.I 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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.TP
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\-c
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Repeat the display
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.I 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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.I wait
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interval is specified, the default is 1 second.
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.TP
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\-f
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Report on the number
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.IR fork (2)
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and
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.IR 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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.TP
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\-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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.TP
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\-M
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Extract values associated with the name list from the specified core
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instead of the default ``/dev/kmem''.
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.TP
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\-N
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Extract the name list from the specified system instead of the default
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1994-08-05 09:14:37 +00:00
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``/kernel''.
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1994-05-27 12:33:43 +00:00
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.TP
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\-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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.TP
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\-s
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Display the contents of the
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.I 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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.TP
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\-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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.TP
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\-w
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Pause
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.I wait
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seconds between each display.
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If no repeat
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.I count
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is specified, the default is infinity.
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.PP
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By default,
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.I vmstat
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displays the following information:
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.PP
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.TP
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procs
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Information about the numbers of processes in various states.
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.sp
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.RS
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.nf
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r in run queue
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b blocked for resources (i/o, paging, etc.)
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w runnable or short sleeper (< 20 secs) but swapped
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.fi
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.RE
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.TP
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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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.sp
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.RS
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.nf
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avm active virtual pages
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fre size of the free list
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.fi
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.RE
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.TP
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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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.sp
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.RS
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.nf
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re page reclaims (simulating reference bits)
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at pages attached (found in free list)
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pi pages paged in
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po pages paged out
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fr pages freed per second
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de anticipated short term memory shortfall
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sr pages scanned by clock algorithm, per-second
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.fi
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.RE
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.TP
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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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.I vmstat
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displays only the first four drives.
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To force
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.I vmstat
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to display specific drives, their names may be supplied on the command line.
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.TP
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faults
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Trap/interrupt rate averages per second over last 5 seconds.
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.sp
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.RS
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.nf
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in device interrupts per interval (including clock interrupts)
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sy system calls per interval
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cs cpu context switch rate (switches/interval)
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.fi
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.RE
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.TP
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cpu
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Breakdown of percentage usage of CPU time.
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.sp
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.RS
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.nf
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us user time for normal and low priority processes
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sy system time
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id cpu idle
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.fi
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.RE
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.SH EXAMPLES
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1996-04-30 05:20:32 +00:00
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The command ``vmstat -w 5'' 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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.ta \w'/dev/kmem 'u
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1994-08-05 09:14:37 +00:00
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/kernel default kernel namelist
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1994-05-27 12:33:43 +00:00
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.br
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/dev/kmem default memory file
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.SH SEE ALSO
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.IR fstat (1),
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.IR netstat (1),
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.IR nfsstat (1),
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.IR ps (1),
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.IR systat (1),
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.IR iostat (8),
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.IR pstat (8)
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.sp
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The sections starting with ``Interpreting system activity'' in
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.IR "Installing and Operating 4.3BSD" .
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.SH BUGS
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The \-c and \-w options are only available with the default output.
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