Annotation of src/usr.bin/vmstat/vmstat.8, Revision 1.19
1.19 ! deraadt 1: .\" $OpenBSD: vmstat.8,v 1.18 2000/11/10 05:10:42 aaron 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
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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
1.9 janjaap 48: .Op Fl M Ar core
1.8 deraadt 49: .Op Fl N Ar system
50: .Op Fl w Ar wait
51: .Op disks
1.19 ! deraadt 52: .Nm vmstat
! 53: .Op Ar count
1.8 deraadt 54: .Sh DESCRIPTION
1.15 aaron 55: .Nm
1.1 deraadt 56: reports certain kernel statistics kept about process, virtual memory,
1.15 aaron 57: disk, trap and CPU activity.
1.8 deraadt 58: .Pp
1.1 deraadt 59: The options are as follows:
1.17 aaron 60: .Bl -tag -width Ds
1.8 deraadt 61: .It Fl c Ar count
1.1 deraadt 62: Repeat the display
1.8 deraadt 63: .Ar count
1.1 deraadt 64: times.
65: The first display is for the time since a reboot and each subsequent report
66: is for the time period since the last display.
67: If no
1.8 deraadt 68: .Ar wait
1.1 deraadt 69: interval is specified, the default is 1 second.
1.8 deraadt 70: .It Fl f
1.1 deraadt 71: Report on the number
1.8 deraadt 72: .Xr fork 2 ,
73: .Xr vfork 2 ,
1.16 niklas 74: .Xr rfork 2 ,
75: system calls as well as kernel thread creations since system startup,
76: and the number of pages of virtual memory involved in each.
1.8 deraadt 77: .It Fl i
1.1 deraadt 78: Report on the number of interrupts taken by each device since system
79: startup.
1.8 deraadt 80: .It Fl M Ar core
1.13 aaron 81: Extract values associated with the name list from the specified core
1.8 deraadt 82: instead of the default
83: .Pa /dev/mem .
84: .It Fl N Ar system
1.1 deraadt 85: Extract the name list from the specified system instead of the default
1.8 deraadt 86: .Pa /bsd .
87: .It Fl m
1.1 deraadt 88: Report on the usage of kernel dynamic memory listed first by size of
89: allocation and then by type of usage.
1.8 deraadt 90: .It Fl s
1.1 deraadt 91: Display the contents of the
1.8 deraadt 92: .Ar sum
1.1 deraadt 93: structure, giving the total number of several kinds of paging related
94: events which have occurred since system startup.
1.8 deraadt 95: .It Fl t
1.1 deraadt 96: Report on the number of page in and page reclaims since system startup,
97: and the amount of time required by each.
1.8 deraadt 98: .It Fl w Ar wait
1.1 deraadt 99: Pause
1.8 deraadt 100: .Ar wait
1.1 deraadt 101: seconds between each display.
102: If no repeat
1.8 deraadt 103: .Ar count
1.1 deraadt 104: is specified, the default is infinity.
1.8 deraadt 105: .El
106: .Pp
1.1 deraadt 107: By default,
1.15 aaron 108: .Nm
1.8 deraadt 109: displays the following information just once:
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
1.15 aaron 124: Information about the usage of virtual and real memory.
125: Virtual pages
1.8 deraadt 126: (reported in units of 1024 bytes) are considered active if they belong
127: to processes which are running or have run in the last 20 seconds.
128: .Pp
129: .Bl -inset -width xxxxxx -compact
130: .It Ar avm
131: active virtual pages
132: .It Ar fre
133: size of the free list
134: .El
135: .Pp
136: .It Ar page
1.1 deraadt 137: Information about page faults and paging activity.
138: These are averaged each five seconds, and given in units per second.
1.8 deraadt 139: .Pp
140: .Bl -inset -width xxxxxx -compact
141: .It Ar re
142: page reclaims (simulating reference bits)
143: .It Ar at
144: pages attached (found in free list)
145: .It Ar pi
146: pages paged in
147: .It Ar po
148: pages paged out
149: .It Ar fr
150: pages freed per second
151: .It Ar de
152: anticipated short term memory shortfall
153: .It Ar sr
154: pages scanned by clock algorithm, per-second
155: .El
156: .Pp
157: .It Ar disks
1.2 tholo 158: Disk transfers per second.
1.1 deraadt 159: Typically paging will be split across the available drives.
160: The header of the field is the first character of the disk name and
161: the unit number.
162: If more than four disk drives are configured in the system,
1.15 aaron 163: .Nm
1.1 deraadt 164: displays only the first four drives.
165: To force
1.15 aaron 166: .Nm
1.1 deraadt 167: to display specific drives, their names may be supplied on the command line.
1.8 deraadt 168: .Pp
169: .It Ar faults
1.1 deraadt 170: Trap/interrupt rate averages per second over last 5 seconds.
1.8 deraadt 171: .Pp
172: .Bl -inset -width xxxxxx -compact
173: .It Ar in
174: device interrupts per interval (including clock interrupts)
175: .It Ar sy
176: system calls per interval
177: .It Ar cs
1.15 aaron 178: CPU context switch rate (switches/interval)
1.8 deraadt 179: .El
180: .Pp
181: .It Ar cpu
1.1 deraadt 182: Breakdown of percentage usage of CPU time.
1.8 deraadt 183: .Pp
184: .Bl -inset -width xxxxxx -compact
185: .It Ar us
186: user time for normal and low priority processes
187: .It Ar sy
188: system time
189: .It Ar id
1.15 aaron 190: CPU idle
1.8 deraadt 191: .El
192: .El
193: .Sh EXAMPLES
1.15 aaron 194: The command
195: .Ic vmstat -w 5
196: will print what the system is doing every five
1.1 deraadt 197: seconds; this is a good choice of printing interval since this is how often
198: some of the statistics are sampled in the system.
199: Others vary every second and running the output for a while will make it
200: apparent which are recomputed every second.
1.8 deraadt 201: .Sh FILES
1.18 aaron 202: .Bl -tag -width /dev/mem -compact
1.8 deraadt 203: .It Pa /bsd
1.11 aaron 204: default kernel namelist
1.8 deraadt 205: .It Pa /dev/mem
1.11 aaron 206: default memory file
1.8 deraadt 207: .El
208: .Sh SEE ALSO
209: .Xr fstat 1 ,
210: .Xr netstat 1 ,
211: .Xr nfsstat 1 ,
212: .Xr ps 1 ,
213: .Xr systat 1 ,
214: .Xr iostat 8 ,
215: .Xr pstat 8
1.14 aaron 216: .Pp
1.15 aaron 217: The sections starting with
218: .Dq Interpreting system activity
219: in
1.10 pjanzen 220: .%T "Installing and Operating 4.3BSD" .
1.8 deraadt 221: .Sh BUGS
222: The
223: .Fl c
224: and
225: .Fl w
226: options are only available with the default output.
227: .Pp
228: This manual page lacks an incredible amount of detail.
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