1.\" $NetBSD: vmstat.1,v 1.8 2002/11/07 13:40:16 enami 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 1 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. 143This contains various paging event and memory status counters. 144.It Fl u Ar histname 145Dump the specified UVM history. 146.It Fl U 147Dump all UVM histories. 148.It Fl v 149Print more verbose information. 150When used with the 151.Fl i 152or 153.Fl e 154options, prints out all interrupts or event counters, not just those with 155non-zero values. 156.It Fl w Ar wait 157Pause 158.Ar wait 159seconds between each display. 160If no repeat 161.Ar count 162is specified, the default is infinity. 163.El 164.Pp 165By default, 166.Nm 167displays the following information: 168.Pp 169.Bl -tag -width memory 170.It procs 171Information about the numbers of processes in various states. 172.Pp 173.Bl -tag -width abcd -compact 174.It r 175in run queue 176.It b 177blocked for resources (i/o, paging, etc.) 178.It w 179runnable or short sleeper (\*[Lt] 20 secs) but swapped 180.El 181.It memory 182Information about the usage of virtual and real memory. 183Virtual pages (reported in units of 1024 bytes) are considered active if 184they belong to processes which are running or have run in the last 20 185seconds. 186.Pp 187.Bl -tag -width abcd -compact 188.It avm 189active virtual pages 190.It fre 191size of the free list 192.El 193.It page 194Information about page faults and paging activity. 195These are averaged every five seconds, and given in units per second. 196.Pp 197.Bl -tag -width abcd -compact 198.It flt 199total page faults 200.It re 201page reclaims (simulating reference bits) 202.It pi 203pages paged in 204.It po 205pages paged out 206.It fr 207pages freed per second 208.It sr 209pages scanned by clock algorithm, per-second 210.El 211.It disks 212Disk transfers per second. 213Typically paging will be split across the available drives. 214The header of the field is the first character of the disk name and 215the unit number. 216If more than four disk drives are configured in the system, 217.Nm 218displays only the first four drives. 219To force 220.Nm 221to display specific drives, their names may be supplied on the command line. 222.It faults 223Trap/interrupt rate averages per second over last 5 seconds. 224.Pp 225.Bl -tag -width abcd -compact 226.It in 227device interrupts per interval (including clock interrupts) 228.It sy 229system calls per interval 230.It cs 231cpu context switch rate (switches/interval) 232.El 233.It cpu 234Breakdown of percentage usage of CPU time. 235.Pp 236.Bl -tag -width abcd -compact 237.It us 238user time for normal and low priority processes 239.It sy 240system time 241.It id 242cpu idle 243.El 244.El 245.Sh FILES 246.Bl -tag -width eeenymeeny -compact 247.It Pa /netbsd 248default kernel namelist 249.It Pa /dev/mem 250default memory file 251.El 252.Sh EXAMPLES 253The command 254.Dq Li vmstat -w 5 255will print what the system is doing every five 256seconds; this is a good choice of printing interval since this is how often 257some of the statistics are sampled in the system. 258Others vary every second and running the output for a while will make it 259apparent which are recomputed every second. 260.Sh SEE ALSO 261.Xr fstat 1 , 262.Xr netstat 1 , 263.Xr nfsstat 1 , 264.Xr ps 1 , 265.Xr systat 1 , 266.Xr iostat 8 , 267.Xr pstat 8 268.Pp 269The sections starting with 270.Dq Interpreting system activity 271in 272.%T Installing and Operating 4.3BSD . 273.Sh BUGS 274The 275.Fl c 276and 277.Fl w 278options are only available with the default output. 279.Pp 280The 281.Fl l , 282.Fl u , 283and 284.Fl U 285options are useful only if the system was compiled with support for UVM 286history. 287