Annotation of src/usr.bin/vmstat/vmstat.8, Revision 1.27
1.27 ! millert 1: .\" $OpenBSD: vmstat.8,v 1.26 2003/02/17 07:24:32 jmc Exp $
1.3 deraadt 2: .\" $NetBSD: vmstat.8,v 1.12 1996/05/10 23:19:30 thorpej Exp $
1.1 deraadt 3: .\"
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1.1 deraadt 16: .\" may be used to endorse or promote products derived from this software
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31: .\" @(#)vmstat.8 8.1 (Berkeley) 6/6/93
32: .\"
1.8 deraadt 33: .Dd June 6, 1993
34: .Dt VMSTAT 8
35: .Os
36: .Sh NAME
37: .Nm vmstat
1.24 deraadt 38: .Nd report statistics about kernel activities
1.8 deraadt 39: .Sh SYNOPSIS
40: .Nm vmstat
1.23 art 41: .Op Fl fimstv
1.8 deraadt 42: .Nm vmstat
43: .Op Fl c Ar count
1.9 janjaap 44: .Op Fl M Ar core
1.8 deraadt 45: .Op Fl N Ar system
46: .Op Fl w Ar wait
1.26 jmc 47: .Op Ar disks
1.8 deraadt 48: .Sh DESCRIPTION
1.15 aaron 49: .Nm
1.1 deraadt 50: reports certain kernel statistics kept about process, virtual memory,
1.15 aaron 51: disk, trap and CPU activity.
1.8 deraadt 52: .Pp
1.1 deraadt 53: The options are as follows:
1.17 aaron 54: .Bl -tag -width Ds
1.8 deraadt 55: .It Fl c Ar count
1.1 deraadt 56: Repeat the display
1.8 deraadt 57: .Ar count
1.1 deraadt 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
1.8 deraadt 62: .Ar wait
1.1 deraadt 63: interval is specified, the default is 1 second.
1.8 deraadt 64: .It Fl f
1.26 jmc 65: Report on the number of
1.8 deraadt 66: .Xr fork 2 ,
1.21 angelos 67: .Xr rfork 2
1.26 jmc 68: and
69: .Xr vfork 2
1.16 niklas 70: system calls as well as kernel thread creations since system startup,
71: and the number of pages of virtual memory involved in each.
1.8 deraadt 72: .It Fl i
1.1 deraadt 73: Report on the number of interrupts taken by each device since system
74: startup.
1.8 deraadt 75: .It Fl M Ar core
1.13 aaron 76: Extract values associated with the name list from the specified core
1.22 miod 77: instead of the running kernel.
1.8 deraadt 78: .It Fl N Ar system
1.22 miod 79: Extract the name list from the specified system instead of the running kernel.
1.8 deraadt 80: .It Fl m
1.1 deraadt 81: Report on the usage of kernel dynamic memory listed first by size of
82: allocation and then by type of usage.
1.8 deraadt 83: .It Fl s
1.1 deraadt 84: Display the contents of the
1.8 deraadt 85: .Ar sum
1.1 deraadt 86: structure, giving the total number of several kinds of paging related
87: events which have occurred since system startup.
1.8 deraadt 88: .It Fl t
1.1 deraadt 89: Report on the number of page in and page reclaims since system startup,
90: and the amount of time required by each.
1.8 deraadt 91: .It Fl w Ar wait
1.1 deraadt 92: Pause
1.8 deraadt 93: .Ar wait
1.1 deraadt 94: seconds between each display.
95: If no repeat
1.8 deraadt 96: .Ar count
1.1 deraadt 97: is specified, the default is infinity.
1.23 art 98: .It Fl v
99: Print more verbose information.
1.8 deraadt 100: .El
101: .Pp
1.1 deraadt 102: By default,
1.15 aaron 103: .Nm
1.8 deraadt 104: displays the following information just once:
105: .Bl -tag -width "whatever"
1.26 jmc 106: .It Ar procs
1.1 deraadt 107: Information about the numbers of processes in various states.
1.8 deraadt 108: .Pp
109: .Bl -inset -width xxxxxx -compact
110: .It Ar r
111: in run queue
112: .It Ar b
113: blocked for resources (i/o, paging, etc.)
114: .It Ar w
115: runnable or short sleeper (< 20 secs) but swapped
116: .El
117: .Pp
118: .It Ar memory
1.15 aaron 119: Information about the usage of virtual and real memory.
120: Virtual pages
1.8 deraadt 121: (reported in units of 1024 bytes) are considered active if they belong
122: to processes which are running or have run in the last 20 seconds.
123: .Pp
124: .Bl -inset -width xxxxxx -compact
125: .It Ar avm
126: active virtual pages
127: .It Ar fre
128: size of the free list
129: .El
130: .Pp
131: .It Ar page
1.1 deraadt 132: Information about page faults and paging activity.
133: These are averaged each five seconds, and given in units per second.
1.8 deraadt 134: .Pp
135: .Bl -inset -width xxxxxx -compact
136: .It Ar re
137: page reclaims (simulating reference bits)
138: .It Ar at
139: pages attached (found in free list)
140: .It Ar pi
141: pages paged in
142: .It Ar po
143: pages paged out
144: .It Ar fr
145: pages freed per second
146: .It Ar sr
147: pages scanned by clock algorithm, per-second
148: .El
149: .Pp
150: .It Ar disks
1.2 tholo 151: Disk transfers per second.
1.1 deraadt 152: Typically paging will be split across the available drives.
153: The header of the field is the first character of the disk name and
154: the unit number.
155: If more than four disk drives are configured in the system,
1.15 aaron 156: .Nm
1.1 deraadt 157: displays only the first four drives.
158: To force
1.15 aaron 159: .Nm
1.1 deraadt 160: to display specific drives, their names may be supplied on the command line.
1.8 deraadt 161: .Pp
162: .It Ar faults
1.1 deraadt 163: Trap/interrupt rate averages per second over last 5 seconds.
1.8 deraadt 164: .Pp
165: .Bl -inset -width xxxxxx -compact
166: .It Ar in
167: device interrupts per interval (including clock interrupts)
168: .It Ar sy
169: system calls per interval
170: .It Ar cs
1.15 aaron 171: CPU context switch rate (switches/interval)
1.8 deraadt 172: .El
173: .Pp
174: .It Ar cpu
1.1 deraadt 175: Breakdown of percentage usage of CPU time.
1.8 deraadt 176: .Pp
177: .Bl -inset -width xxxxxx -compact
178: .It Ar us
179: user time for normal and low priority processes
180: .It Ar sy
181: system time
182: .It Ar id
1.15 aaron 183: CPU idle
1.8 deraadt 184: .El
185: .El
186: .Sh EXAMPLES
1.15 aaron 187: The command
188: .Ic vmstat -w 5
189: will print what the system is doing every five
1.1 deraadt 190: seconds; this is a good choice of printing interval since this is how often
191: some of the statistics are sampled in the system.
192: Others vary every second and running the output for a while will make it
193: apparent which are recomputed every second.
1.8 deraadt 194: .Sh SEE ALSO
195: .Xr fstat 1 ,
196: .Xr netstat 1 ,
197: .Xr nfsstat 1 ,
198: .Xr ps 1 ,
199: .Xr systat 1 ,
200: .Xr iostat 8 ,
201: .Xr pstat 8
1.14 aaron 202: .Pp
1.15 aaron 203: The sections starting with
204: .Dq Interpreting system activity
205: in
1.10 pjanzen 206: .%T "Installing and Operating 4.3BSD" .
1.8 deraadt 207: .Sh BUGS
208: The
209: .Fl c
210: and
211: .Fl w
212: options are only available with the default output.
213: .Pp
214: This manual page lacks an incredible amount of detail.
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