Annotation of src/usr.bin/vmstat/vmstat.8, Revision 1.8
1.8 ! deraadt 1: .\" $OpenBSD: vmstat.8,v 1.7 1997/01/01 18:57:12 kstailey Exp $
1.3 deraadt 2: .\" $NetBSD: vmstat.8,v 1.12 1996/05/10 23:19:30 thorpej Exp $
1.1 deraadt 3: .\"
4: .\" Copyright (c) 1986, 1993
5: .\" The Regents of the University of California. All rights reserved.
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8: .\" modification, are permitted provided that the following conditions
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11: .\" notice, this list of conditions and the following disclaimer.
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17: .\" This product includes software developed by the University of
18: .\" California, Berkeley and its contributors.
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35: .\" @(#)vmstat.8 8.1 (Berkeley) 6/6/93
36: .\"
1.8 ! deraadt 37: .Dd June 6, 1993
! 38: .Dt VMSTAT 8
! 39: .Os
! 40: .Sh NAME
! 41: .Nm vmstat
! 42: .Nd report virtual memory statistics
! 43: .Sh SYNOPSIS
! 44: .Nm vmstat
! 45: .Op Fl fimst
! 46: .Nm vmstat
! 47: .Op Fl c Ar count
! 48: .Op Fl M Ar count
! 49: .Op Fl N Ar system
! 50: .Op Fl w Ar wait
! 51: .Op disks
! 52: .Sh DESCRIPTION
! 53: .Nm vmstat
1.1 deraadt 54: reports certain kernel statistics kept about process, virtual memory,
55: disk, trap and cpu activity.
1.8 ! deraadt 56: .Pp
1.1 deraadt 57: The options are as follows:
1.8 ! deraadt 58: .Bl -tag -width "blah"
! 59: .It Fl c Ar count
1.1 deraadt 60: Repeat the display
1.8 ! deraadt 61: .Ar count
1.1 deraadt 62: times.
63: The first display is for the time since a reboot and each subsequent report
64: is for the time period since the last display.
65: If no
1.8 ! deraadt 66: .Ar wait
1.1 deraadt 67: interval is specified, the default is 1 second.
1.8 ! deraadt 68: .It Fl f
1.1 deraadt 69: Report on the number
1.8 ! deraadt 70: .Xr fork 2 ,
! 71: .Xr vfork 2 ,
1.1 deraadt 72: and
1.8 ! deraadt 73: .Xr rfork 2
1.1 deraadt 74: system calls since system startup, and the number of pages of virtual memory
75: involved in each.
1.8 ! deraadt 76: .It Fl i
1.1 deraadt 77: Report on the number of interrupts taken by each device since system
78: startup.
1.8 ! deraadt 79: .It Fl M Ar core
1.1 deraadt 80: Extract values associated with the name list from the specified core
1.8 ! deraadt 81: instead of the default
! 82: .Pa /dev/mem .
! 83: .It Fl N Ar system
1.1 deraadt 84: Extract the name list from the specified system instead of the default
1.8 ! deraadt 85: .Pa /bsd .
! 86: .It Fl m
1.1 deraadt 87: Report on the usage of kernel dynamic memory listed first by size of
88: allocation and then by type of usage.
1.8 ! deraadt 89: .It Fl s
1.1 deraadt 90: Display the contents of the
1.8 ! deraadt 91: .Ar sum
1.1 deraadt 92: structure, giving the total number of several kinds of paging related
93: events which have occurred since system startup.
1.8 ! deraadt 94: .It Fl t
1.1 deraadt 95: Report on the number of page in and page reclaims since system startup,
96: and the amount of time required by each.
1.8 ! deraadt 97: .It Fl w Ar wait
1.1 deraadt 98: Pause
1.8 ! deraadt 99: .Ar wait
1.1 deraadt 100: seconds between each display.
101: If no repeat
1.8 ! deraadt 102: .Ar count
1.1 deraadt 103: is specified, the default is infinity.
1.8 ! deraadt 104: .El
! 105: .Pp
1.1 deraadt 106: By default,
1.8 ! deraadt 107: .Nm vmstat
! 108: displays the following information just once:
! 109: .Pp
! 110: .Bl -tag -width "whatever"
! 111: .It procs
1.1 deraadt 112: Information about the numbers of processes in various states.
1.8 ! deraadt 113: .Pp
! 114: .Bl -inset -width xxxxxx -compact
! 115: .It Ar r
! 116: in run queue
! 117: .It Ar b
! 118: blocked for resources (i/o, paging, etc.)
! 119: .It Ar w
! 120: runnable or short sleeper (< 20 secs) but swapped
! 121: .El
! 122: .Pp
! 123: .It Ar memory
! 124: Information about the usage of virtual and real memory. Virtual pages
! 125: (reported in units of 1024 bytes) are considered active if they belong
! 126: to processes which are running or have run in the last 20 seconds.
! 127: .Pp
! 128: .Bl -inset -width xxxxxx -compact
! 129: .It Ar avm
! 130: active virtual pages
! 131: .It Ar fre
! 132: size of the free list
! 133: .El
! 134: .Pp
! 135: .It Ar page
1.1 deraadt 136: Information about page faults and paging activity.
137: These are averaged each five seconds, and given in units per second.
1.8 ! deraadt 138: .Pp
! 139: .Bl -inset -width xxxxxx -compact
! 140: .It Ar re
! 141: page reclaims (simulating reference bits)
! 142: .It Ar at
! 143: pages attached (found in free list)
! 144: .It Ar pi
! 145: pages paged in
! 146: .It Ar po
! 147: pages paged out
! 148: .It Ar fr
! 149: pages freed per second
! 150: .It Ar de
! 151: anticipated short term memory shortfall
! 152: .It Ar sr
! 153: pages scanned by clock algorithm, per-second
! 154: .El
! 155: .Pp
! 156: .It Ar disks
1.2 tholo 157: Disk transfers per second.
1.1 deraadt 158: Typically paging will be split across the available drives.
159: The header of the field is the first character of the disk name and
160: the unit number.
161: If more than four disk drives are configured in the system,
1.8 ! deraadt 162: .Nm vmstat
1.1 deraadt 163: displays only the first four drives.
164: To force
1.8 ! deraadt 165: .Nm vmstat
1.1 deraadt 166: to display specific drives, their names may be supplied on the command line.
1.8 ! deraadt 167: .Pp
! 168: .It Ar faults
1.1 deraadt 169: Trap/interrupt rate averages per second over last 5 seconds.
1.8 ! deraadt 170: .Pp
! 171: .Bl -inset -width xxxxxx -compact
! 172: .It Ar in
! 173: device interrupts per interval (including clock interrupts)
! 174: .It Ar sy
! 175: system calls per interval
! 176: .It Ar cs
! 177: cpu context switch rate (switches/interval)
! 178: .El
! 179: .Pp
! 180: .It Ar cpu
1.1 deraadt 181: Breakdown of percentage usage of CPU time.
1.8 ! deraadt 182: .Pp
! 183: .Bl -inset -width xxxxxx -compact
! 184: .It Ar us
! 185: user time for normal and low priority processes
! 186: .It Ar sy
! 187: system time
! 188: .It Ar id
! 189: cpu idle
! 190: .El
! 191: .El
! 192: .Pp
! 193: .Sh EXAMPLES
1.6 deraadt 194: The command ``vmstat -w 5'' will print what the system is doing every five
1.1 deraadt 195: seconds; this is a good choice of printing interval since this is how often
196: some of the statistics are sampled in the system.
197: Others vary every second and running the output for a while will make it
198: apparent which are recomputed every second.
1.8 ! deraadt 199: .Sh FILES
! 200: .Bl -tag -width /etc/networks -compact
! 201: .It Pa /bsd
! 202: Default kernel namelist
! 203: .It Pa /dev/mem
! 204: Default memory file
! 205: .El
! 206: .Pp
! 207: .Sh SEE ALSO
! 208: .Xr fstat 1 ,
! 209: .Xr netstat 1 ,
! 210: .Xr nfsstat 1 ,
! 211: .Xr ps 1 ,
! 212: .Xr systat 1 ,
! 213: .Xr iostat 8 ,
! 214: .Xr pstat 8
1.1 deraadt 215: .sp
216: The sections starting with ``Interpreting system activity'' in
1.8 ! deraadt 217: .Xr "Installing and Operating 4.3BSD" .
! 218: .Sh BUGS
! 219: The
! 220: .Fl c
! 221: and
! 222: .Fl w
! 223: options are only available with the default output.
! 224: .Pp
! 225: This manual page lacks an incredible amount of detail.
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