Annotation of src/usr.bin/vmstat/vmstat.8, Revision 1.1
1.1 ! deraadt 1: .\" $NetBSD: vmstat.8,v 1.11 1995/08/10 23:29:47 jtc Exp $
! 2: .\"
! 3: .\" Copyright (c) 1986, 1993
! 4: .\" The Regents of the University of California. 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 University of
! 17: .\" California, Berkeley and its contributors.
! 18: .\" 4. Neither the name of the University nor the names of its contributors
! 19: .\" may be used to endorse or promote products derived from this software
! 20: .\" without specific prior written permission.
! 21: .\"
! 22: .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 23: .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 24: .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 25: .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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! 27: .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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! 34: .\" @(#)vmstat.8 8.1 (Berkeley) 6/6/93
! 35: .\"
! 36: .TH VMSTAT 8 "June 6, 1993"
! 37: .UC 4
! 38: .SH NAME
! 39: vmstat \- report virtual memory statistics
! 40: .SH SYNOPSIS
! 41: .nf
! 42: .ft B
! 43: vmstat [ \-fimst ] [ \-c count ] [ \-M core ] [ \-N system ]
! 44: .ti +5
! 45: [ \-w wait ] [ disks ]
! 46: .ft R
! 47: .fi
! 48: .SH DESCRIPTION
! 49: .I Vmstat
! 50: reports certain kernel statistics kept about process, virtual memory,
! 51: disk, trap and cpu activity.
! 52: .PP
! 53: The options are as follows:
! 54: .TP
! 55: \-c
! 56: Repeat the display
! 57: .I count
! 58: times.
! 59: The first display is for the time since a reboot and each subsequent report
! 60: is for the time period since the last display.
! 61: If no
! 62: .I wait
! 63: interval is specified, the default is 1 second.
! 64: .TP
! 65: \-f
! 66: Report on the number
! 67: .IR fork (2)
! 68: and
! 69: .IR vfork (2)
! 70: system calls since system startup, and the number of pages of virtual memory
! 71: involved in each.
! 72: .TP
! 73: \-i
! 74: Report on the number of interrupts taken by each device since system
! 75: startup.
! 76: .TP
! 77: \-M
! 78: Extract values associated with the name list from the specified core
! 79: instead of the default ``/dev/kmem''.
! 80: .TP
! 81: \-N
! 82: Extract the name list from the specified system instead of the default
! 83: ``/netbsd''.
! 84: .TP
! 85: \-m
! 86: Report on the usage of kernel dynamic memory listed first by size of
! 87: allocation and then by type of usage.
! 88: .TP
! 89: \-s
! 90: Display the contents of the
! 91: .I sum
! 92: structure, giving the total number of several kinds of paging related
! 93: events which have occurred since system startup.
! 94: .TP
! 95: \-t
! 96: Report on the number of page in and page reclaims since system startup,
! 97: and the amount of time required by each.
! 98: .TP
! 99: \-w
! 100: Pause
! 101: .I wait
! 102: seconds between each display.
! 103: If no repeat
! 104: .I count
! 105: is specified, the default is infinity.
! 106: .PP
! 107: By default,
! 108: .I vmstat
! 109: displays the following information:
! 110: .PP
! 111: .TP
! 112: procs
! 113: Information about the numbers of processes in various states.
! 114: .sp
! 115: .RS
! 116: .nf
! 117: r in run queue
! 118: b blocked for resources (i/o, paging, etc.)
! 119: w runnable or short sleeper (< 20 secs) but swapped
! 120: .fi
! 121: .RE
! 122: .TP
! 123: memory
! 124: Information about the usage of virtual and real memory.
! 125: Virtual pages (reported in units of 1024 bytes) are considered active if
! 126: they belong to processes which are running or have run in the last 20
! 127: seconds.
! 128: .sp
! 129: .RS
! 130: .nf
! 131: avm active virtual pages
! 132: fre size of the free list
! 133: .fi
! 134: .RE
! 135: .TP
! 136: page
! 137: Information about page faults and paging activity.
! 138: These are averaged each five seconds, and given in units per second.
! 139: .sp
! 140: .RS
! 141: .nf
! 142: re page reclaims (simulating reference bits)
! 143: at pages attached (found in free list)
! 144: pi pages paged in
! 145: po pages paged out
! 146: fr pages freed per second
! 147: de anticipated short term memory shortfall
! 148: sr pages scanned by clock algorithm, per-second
! 149: .fi
! 150: .RE
! 151: .TP
! 152: disks
! 153: Disk operations per second (this field is system dependent).
! 154: Typically paging will be split across the available drives.
! 155: The header of the field is the first character of the disk name and
! 156: the unit number.
! 157: If more than four disk drives are configured in the system,
! 158: .I vmstat
! 159: displays only the first four drives.
! 160: To force
! 161: .I vmstat
! 162: to display specific drives, their names may be supplied on the command line.
! 163: .TP
! 164: faults
! 165: Trap/interrupt rate averages per second over last 5 seconds.
! 166: .sp
! 167: .RS
! 168: .nf
! 169: in device interrupts per interval (including clock interrupts)
! 170: sy system calls per interval
! 171: cs cpu context switch rate (switches/interval)
! 172: .fi
! 173: .RE
! 174: .TP
! 175: cpu
! 176: Breakdown of percentage usage of CPU time.
! 177: .sp
! 178: .RS
! 179: .nf
! 180: us user time for normal and low priority processes
! 181: sy system time
! 182: id cpu idle
! 183: .fi
! 184: .RE
! 185: .SH EXAMPLES
! 186: The command ``vmstat -i 5'' will print what the system is doing every five
! 187: seconds; this is a good choice of printing interval since this is how often
! 188: some of the statistics are sampled in the system.
! 189: Others vary every second and running the output for a while will make it
! 190: apparent which are recomputed every second.
! 191: .SH FILES
! 192: .ta \w'/dev/kmem 'u
! 193: /netbsd default kernel namelist
! 194: .br
! 195: /dev/kmem default memory file
! 196: .SH SEE ALSO
! 197: .IR fstat (1),
! 198: .IR netstat (1),
! 199: .IR nfsstat (1),
! 200: .IR ps (1),
! 201: .IR systat (1),
! 202: .IR iostat (8),
! 203: .IR pstat (8)
! 204: .sp
! 205: The sections starting with ``Interpreting system activity'' in
! 206: .IR "Installing and Operating 4.3BSD" .
! 207: .SH BUGS
! 208: The \-c and \-w options are only available with the default output.
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