315 lines
8.6 KiB
Groff
315 lines
8.6 KiB
Groff
.\" Copyright (c) 1986, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)vmstat.8 8.1 (Berkeley) 6/6/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 6, 1996
|
|
.Dt VMSTAT 8
|
|
.Os BSD 4
|
|
.Sh NAME
|
|
.Nm vmstat
|
|
.Nd report virtual memory statistics
|
|
.Sh SYNOPSIS
|
|
.Nm vmstat
|
|
.\" .Op Fl fimst
|
|
.Op Fl imsz
|
|
.Op Fl c Ar count
|
|
.Op Fl M Ar core
|
|
.Op Fl N Ar system
|
|
.Op Fl w Ar wait
|
|
.Op Fl n Ar devs
|
|
.Op Fl p Ar type,if,pass
|
|
.Op Ar disks
|
|
.Sh DESCRIPTION
|
|
.Nm Vmstat
|
|
reports certain kernel statistics kept about process, virtual memory,
|
|
disk, trap and cpu activity.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width indent
|
|
.It Fl c
|
|
Repeat the display
|
|
.Ar count
|
|
times.
|
|
The first display is for the time since a reboot and each subsequent
|
|
report is for the time period since the last display.
|
|
If no repeat
|
|
.Ar count
|
|
is specified, and
|
|
.Fl w
|
|
is specified, the default is infinity, otherwise the default is one.
|
|
.\" .It Fl f
|
|
.\" Report on the number
|
|
.\" .Xr fork 2
|
|
.\" and
|
|
.\" .Xr vfork 2
|
|
.\" system calls since system startup, and the number of pages of virtual memory
|
|
.\" involved in each.
|
|
.It Fl i
|
|
Report on the number of interrupts taken by each device since system
|
|
startup.
|
|
.It Fl M
|
|
Extract values associated with the name list from the specified
|
|
.Ar core
|
|
instead of the default
|
|
.Pa /dev/kmem .
|
|
.It Fl N
|
|
Extract the name list from the specified
|
|
.Ar system
|
|
instead of the default
|
|
.Pa /kernel .
|
|
.It Fl m
|
|
Report on the usage of kernel dynamic memory listed first by size of
|
|
allocation and then by type of usage.
|
|
.It Fl n
|
|
Change the maximum number of disks to display from the default of 2.
|
|
.It Fl p
|
|
Specify which types of devices to display. There are three different
|
|
categories of devices:
|
|
|
|
.Bl -tag -width indent -compact
|
|
.It device type:
|
|
.Bl -tag -width 123456789 -compact
|
|
.It da
|
|
Direct Access devices
|
|
.It sa
|
|
Sequential Access devices
|
|
.It printer
|
|
Printers
|
|
.It proc
|
|
Processor devices
|
|
.It worm
|
|
Write Once Read Multiple devices
|
|
.It cd
|
|
CD devices
|
|
.It scanner
|
|
Scanner devices
|
|
.It optical
|
|
Optical Memory devices
|
|
.It changer
|
|
Medium Changer devices
|
|
.It comm
|
|
Communication devices
|
|
.It array
|
|
Storage Array devices
|
|
.It enclosure
|
|
Enclosure Services devices
|
|
.It floppy
|
|
Floppy devices
|
|
.El
|
|
.Pp
|
|
.It interface:
|
|
.Bl -tag -width 123456789 -compact
|
|
.It IDE
|
|
Integrated Drive Electronics devices
|
|
.It SCSI
|
|
Small Computer System Interface devices
|
|
.It other
|
|
Any other device interface
|
|
.El
|
|
.Pp
|
|
.It passthrough:
|
|
.Bl -tag -width 123456789 -compact
|
|
.It pass
|
|
Passthrough devices
|
|
.El
|
|
.El
|
|
.Pp
|
|
The user must specify at least one device type, and may specify at most
|
|
one device type from each category. Multiple device types in a single
|
|
device type statement must be separated by commas.
|
|
.Pp
|
|
Any number of
|
|
.Fl p
|
|
arguments may be specified on the command line. All
|
|
.Fl p
|
|
arguments are ORed together to form a matching expression against which
|
|
all devices in the system are compared. Any device that fully matches
|
|
any
|
|
.Fl p
|
|
argument will be included in the
|
|
.Nm
|
|
output, up to three devices, or the maximum number of devices specified
|
|
by the user.
|
|
.It Fl s
|
|
Display the contents of the
|
|
.Em sum
|
|
structure, giving the total number of several kinds of paging related
|
|
events which have occurred since system startup.
|
|
.\" .It Fl t
|
|
.\" Report on the number of page in and page reclaims since system startup,
|
|
.\" and the amount of time required by each.
|
|
.It Fl w
|
|
Pause
|
|
.Ar wait
|
|
seconds between each display.
|
|
If no repeat
|
|
.Ar wait
|
|
interval is specified, the default is 1 second.
|
|
.It Fl z
|
|
Report on memory used by the kernel zone allocator, by zone.
|
|
.El
|
|
.Pp
|
|
By default,
|
|
.Nm
|
|
displays the following information:
|
|
.Pp
|
|
.Bl -tag -width indent
|
|
.It procs
|
|
Information about the numbers of processes in various states.
|
|
.Pp
|
|
.Bl -tag -width indent -compact
|
|
.It r
|
|
in run queue
|
|
.It b
|
|
blocked for resources (i/o, paging, etc.)
|
|
.It w
|
|
runnable or short sleeper (< 20 secs) but swapped
|
|
.El
|
|
.It memory
|
|
Information about the usage of virtual and real memory.
|
|
Virtual pages (reported in units of 1024 bytes) are considered active if
|
|
they belong to processes which are running or have run in the last 20
|
|
seconds.
|
|
.Pp
|
|
.Bl -tag -width indent -compact
|
|
.It avm
|
|
active virtual pages
|
|
.It fre
|
|
size of the free list
|
|
.El
|
|
.It page
|
|
Information about page faults and paging activity.
|
|
These are averaged each five seconds, and given in units per second.
|
|
.Pp
|
|
.Bl -tag -width indent -compact
|
|
.It flt
|
|
total number of page faults
|
|
.It re
|
|
page reclaims (simulating reference bits)
|
|
.\" .It at
|
|
.\" pages attached (found in free list)
|
|
.It pi
|
|
pages paged in
|
|
.It po
|
|
pages paged out
|
|
.It fr
|
|
pages freed per second
|
|
.\" .It de
|
|
.\" anticipated short term memory shortfall
|
|
.It sr
|
|
pages scanned by clock algorithm, per-second
|
|
.El
|
|
.It disks
|
|
Disk operations per second (this field is system dependent).
|
|
Typically paging will be split across the available drives.
|
|
The header of the field is the first two characters of the disk name and
|
|
the unit number.
|
|
If more than three disk drives are configured in the system,
|
|
.Nm
|
|
displays only the first three drives, unless the user specifies the
|
|
.Fl n
|
|
argument to increase the number of drives displayed. This will probably
|
|
cause the display to exceed 80 columns, however.
|
|
To force
|
|
.Nm
|
|
to display specific drives, their names may be supplied on the command line.
|
|
.Nm
|
|
defaults to show disks first, and then various other random devices in the
|
|
system to add up to three devices, if there are that many devices in the
|
|
system. If devices are specified on the command line, or if a device type
|
|
matching pattern is specified (see above),
|
|
.Nm
|
|
will only display the given devices or the devices matching the pattern,
|
|
and will not randomly select other devices in the system.
|
|
.It faults
|
|
Trap/interrupt rate averages per second over last 5 seconds.
|
|
.Pp
|
|
.Bl -tag -width indent -compact
|
|
.It in
|
|
device interrupts per interval (including clock interrupts)
|
|
.It sy
|
|
system calls per interval
|
|
.It cs
|
|
cpu context switch rate (switches/interval)
|
|
.El
|
|
.It cpu
|
|
Breakdown of percentage usage of CPU time.
|
|
.Pp
|
|
.Bl -tag -width indent -compact
|
|
.It us
|
|
user time for normal and low priority processes
|
|
.It sy
|
|
system time
|
|
.It id
|
|
cpu idle
|
|
.El
|
|
.El
|
|
.Sh EXAMPLES
|
|
The command:
|
|
.Dl vmstat -w 5
|
|
will print what the system is doing every five
|
|
seconds; this is a good choice of printing interval since this is how often
|
|
some of the statistics are sampled in the system.
|
|
Others vary every second and running the output for a while will make it
|
|
apparent which are recomputed every second.
|
|
.Pp
|
|
The command:
|
|
.Dl vmstat -p da -p cd -w 1
|
|
will tell vmstat to select the first three direct access or CDROM devices
|
|
and display statistics on those devices, as well as other systems
|
|
statistics every second.
|
|
.Sh FILES
|
|
.Bl -tag -width /dev/kmemxxx -compact
|
|
.It Pa /kernel
|
|
default kernel namelist
|
|
.It Pa /dev/kmem
|
|
default memory file
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr fstat 1 ,
|
|
.Xr netstat 1 ,
|
|
.Xr nfsstat 1 ,
|
|
.Xr ps 1 ,
|
|
.Xr systat 1 ,
|
|
.Xr iostat 8 ,
|
|
.Xr pstat 8
|
|
.Pp
|
|
The sections starting with ``Interpreting system activity'' in
|
|
.%T "Installing and Operating 4.3BSD" .
|
|
.Sh BUGS
|
|
The
|
|
.Fl c
|
|
and
|
|
.Fl w
|
|
options are only available with the default output.
|