1.\" $NetBSD: vmstat.1,v 1.6 2002/02/08 01:36:37 ross Exp $ 2.\" 3.\" Copyright (c) 2000 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the NetBSD 17.\" Foundation, Inc. and its contributors. 18.\" 4. Neither the name of The NetBSD Foundation nor the names of its 19.\" contributors may be used to endorse or promote products derived 20.\" from this software without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32.\" POSSIBILITY OF SUCH DAMAGE. 33.\" 34.\" Copyright (c) 1986, 1993 35.\" The Regents of the University of California. All rights reserved. 36.\" 37.\" Redistribution and use in source and binary forms, with or without 38.\" modification, are permitted provided that the following conditions 39.\" are met: 40.\" 1. Redistributions of source code must retain the above copyright 41.\" notice, this list of conditions and the following disclaimer. 42.\" 2. Redistributions in binary form must reproduce the above copyright 43.\" notice, this list of conditions and the following disclaimer in the 44.\" documentation and/or other materials provided with the distribution. 45.\" 3. All advertising materials mentioning features or use of this software 46.\" must display the following acknowledgement: 47.\" This product includes software developed by the University of 48.\" California, Berkeley and its contributors. 49.\" 4. Neither the name of the University nor the names of its contributors 50.\" may be used to endorse or promote products derived from this software 51.\" without specific prior written permission. 52.\" 53.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63.\" SUCH DAMAGE. 64.\" 65.\" @(#)vmstat.8 8.1 (Berkeley) 6/6/93 66.\" 67.Dd November 26, 2001 68.Dt VMSTAT 8 69.Os 70.Sh NAME 71.Nm vmstat 72.Nd report virtual memory statistics 73.Sh SYNOPSIS 74.Nm 75.Op Fl efHilLmsUv 76.Bk -words 77.Op Fl M Ar core 78.Ek 79.Bk -words 80.Op Fl N Ar system 81.Ek 82.Bk -words 83.Op Fl c Ar count 84.Ek 85.Bk -words 86.Op Fl h Ar hashname 87.Ek 88.Bk -words 89.Op Fl u Ar histname 90.Ek 91.Bk -words 92.Op Fl w Ar wait 93.Ek 94.Op Ar disks 95.Sh DESCRIPTION 96.Nm 97reports certain kernel statistics kept about process, virtual memory, 98disk, trap and cpu activity. 99.Pp 100The options are as follows: 101.Bl -tag -width xxxhistname 102.It Fl M Ar core 103Extract values associated with the name list from the specified core 104instead of the default 105.Pa /dev/mem . 106.It Fl N Ar system 107Extract the name list from the specified system instead of the default 108.Pa /netbsd . 109.It Fl c Ar count 110Repeat the display 111.Ar count 112times. 113The first display is for the time since a reboot and each subsequent report 114is for the time period since the last display. 115If no 116.Ar wait 117interval is specified, the default is 1 second. 118.It Fl e 119Report the values of system event counters. 120.It Fl f 121Report fork statistics. 122.It Fl h Ar hashname 123Report hash table statistics for 124.Ar hashname . 125.It Fl H 126Report all hash table statistics. 127.It Fl i 128Report the values of system interrupt counters. 129.It Fl l 130List the UVM histories being maintained by the kernel. 131.It Fl L 132List all the hashes supported for 133.Fl h 134and 135.Fl H . 136.It Fl m 137Report on the usage of kernel dynamic memory listed first by size of 138allocation and then by type of usage. 139.It Fl s 140Display the contents of the 141.Dv uvmexp 142structure. This contains various paging event and memory status counters. 143.It Fl u Ar histname 144Dump the specified UVM history. 145.It Fl U 146Dump all UVM histories. 147.It Fl v 148Print more verbose information. When used with the 149.Fl i 150or 151.Fl e 152options, prints out all interrupts or event counters, not just those with 153non-zero values. 154.It Fl w Ar wait 155Pause 156.Ar wait 157seconds between each display. 158If no repeat 159.Ar count 160is specified, the default is infinity. 161.El 162.Pp 163By default, 164.Nm 165displays the following information: 166.Pp 167.Bl -tag -width memory 168.It procs 169Information about the numbers of processes in various states. 170.Pp 171.Bl -tag -width abcd -compact 172.It r 173in run queue 174.It b 175blocked for resources (i/o, paging, etc.) 176.It w 177runnable or short sleeper (\*[Lt] 20 secs) but swapped 178.El 179.It memory 180Information about the usage of virtual and real memory. 181Virtual pages (reported in units of 1024 bytes) are considered active if 182they belong to processes which are running or have run in the last 20 183seconds. 184.Pp 185.Bl -tag -width abcd -compact 186.It avm 187active virtual pages 188.It fre 189size of the free list 190.El 191.It page 192Information about page faults and paging activity. 193These are averaged every five seconds, and given in units per second. 194.Pp 195.Bl -tag -width abcd -compact 196.It flt 197total page faults 198.It re 199page reclaims (simulating reference bits) 200.It pi 201pages paged in 202.It po 203pages paged out 204.It fr 205pages freed per second 206.It sr 207pages scanned by clock algorithm, per-second 208.El 209.It disks 210Disk transfers per second. 211Typically paging will be split across the available drives. 212The header of the field is the first character of the disk name and 213the unit number. 214If more than four disk drives are configured in the system, 215.Nm 216displays only the first four drives. 217To force 218.Nm 219to display specific drives, their names may be supplied on the command line. 220.It faults 221Trap/interrupt rate averages per second over last 5 seconds. 222.Pp 223.Bl -tag -width abcd -compact 224.It in 225device interrupts per interval (including clock interrupts) 226.It sy 227system calls per interval 228.It cs 229cpu context switch rate (switches/interval) 230.El 231.It cpu 232Breakdown of percentage usage of CPU time. 233.Pp 234.Bl -tag -width abcd -compact 235.It us 236user time for normal and low priority processes 237.It sy 238system time 239.It id 240cpu idle 241.El 242.El 243.Sh FILES 244.Bl -tag -width eeenymeeny -compact 245.It Pa /netbsd 246default kernel namelist 247.It Pa /dev/mem 248default memory file 249.El 250.Sh EXAMPLES 251The command 252.Dq Li vmstat -w 5 253will print what the system is doing every five 254seconds; this is a good choice of printing interval since this is how often 255some of the statistics are sampled in the system. 256Others vary every second and running the output for a while will make it 257apparent which are recomputed every second. 258.Sh SEE ALSO 259.Xr fstat 1 , 260.Xr netstat 1 , 261.Xr nfsstat 1 , 262.Xr ps 1 , 263.Xr systat 1 , 264.Xr iostat 8 , 265.Xr pstat 8 266.Pp 267The sections starting with 268.Dq Interpreting system activity 269in 270.%T Installing and Operating 4.3BSD . 271.Sh BUGS 272The 273.Fl c 274and 275.Fl w 276options are only available with the default output. 277.Pp 278The 279.Fl l , 280.Fl u , 281and 282.Fl U 283options are useful only if the system was compiled with support for UVM 284history. 285