224 lines
5.6 KiB
Groff
224 lines
5.6 KiB
Groff
.\" $NetBSD: iostat.8,v 1.20 2003/05/01 15:10:58 jmmv Exp $
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.\"
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.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)iostat.8 8.1 (Berkeley) 6/6/93
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.\"
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.Dd March 1, 2003
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.Dt IOSTAT 8
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.Os
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.Sh NAME
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.Nm iostat
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.Nd report
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.Tn I/O
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statistics
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.Sh SYNOPSIS
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.Nm
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.Op Fl CdDITx
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.Op Fl c Ar count
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.Op Fl M Ar core
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.Op Fl N Ar system
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.Op Fl w Ar wait
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.Op Ar drives
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.Sh DESCRIPTION
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.Nm
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displays kernel
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.Tn I/O
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statistics on terminal, disk and CPU operations.
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By default,
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.Nm
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displays one line of statistics averaged over the machine's run time.
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The use of
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.Fl c
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presents successive lines averaged over the
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.Ar wait
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period.
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The
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.Fl I
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option causes
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.Nm
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to print raw, unaveraged values.
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.Pp
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Only the last disk option specified
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.Fl ( d ,
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.Fl D ,
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or
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.Fl x )
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is used.
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.Pp
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The options are as follows:
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.Bl -tag -width flag
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.It Fl c Ar count
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Repeat the display
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.Ar count
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times.
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Unless the
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.Fl I
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flag is in effect, the first display is for the time since a reboot and
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each subsequent report is for the time period since the last display.
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If no
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.Ar wait
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interval is specified, the default is 1 second.
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.It Fl C
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Show CPU statistics.
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This is enabled by default unless the
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.Fl d ,
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.Fl D ,
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.Fl T ,
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or
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.Fl x
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flags are used.
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.It Fl d
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Show disk statistics.
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This is the default.
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Displays kilobytes per
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transfer, number of transfers, and megabytes transferred.
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Use of this flag disables display of CPU and tty statistics.
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.It Fl D
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Show alternative disk statistics.
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Displays kilobytes transferred, number of
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transfers, and time spent in transfers.
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Use of this flag disables the default display.
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.It Fl I
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Show the running total values, rather than an average.
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.It Fl M Ar core
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Extract values associated with the name list from the specified core
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instead of the default
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.Dq Pa /dev/mem .
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.It Fl N Ar system
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Extract the name list from the specified system instead of the default
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.Dq Pa /netbsd .
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.It Fl T
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Show tty statistics.
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This is enabled by default unless the
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.Fl C ,
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.Fl d ,
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or
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.Fl D
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flags are used.
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.It Fl w Ar wait
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Pause
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.Ar wait
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seconds between each display.
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If no repeat
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.Ar count
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is specified, the default is infinity.
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.It Fl x
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Show extended disk statistics.
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Each disk is displayed on a line of its own with all available
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statistics.
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This option overrides all other display options, and all
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disks are displayed unless specific disks
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are provided as arguments.
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Additionally, separate read and write statistics are displayed.
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.El
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.Pp
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.Nm
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displays its information in the following format:
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.Bl -tag -width flag
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.It tty
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.Bl -tag -width indent -compact
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.It tin
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characters read from terminals
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.It tout
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characters written to terminals
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.El
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.It disks
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Disk operations.
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The header of the field is the disk name and unit number.
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If more than four disk drives are configured in the system,
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.Nm
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displays only the first four drives.
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To force
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.Nm
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to display specific drives, their names may be supplied on the command
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line.
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.Pp
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.Bl -tag -width indent -compact
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.It KB/t
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Kilobytes transferred per disk transfer
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.It t/s
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transfers per second
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.It MB/s
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Megabytes transferred per second
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.Pp
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.El
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The alternative display format, (selected with
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.Fl D ) ,
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presents the following values.
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.Bl -tag -width indent -compact
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.It KB
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Kilobytes transferred
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.It xfr
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Disk transfers
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.It time
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Seconds spent in disk activity
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.El
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.It cpu
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.Bl -tag -width indent -compact
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.It \&us
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% of CPU time in user mode
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.It \&ni
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% of CPU time in user mode running niced processes
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.It \&sy
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% of CPU time in system mode
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.It \&id
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% of CPU time in idle mode
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.El
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.El
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.Sh FILES
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.Bl -tag -width /dev/mem -compact
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.It Pa /netbsd
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Default kernel namelist.
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.It Pa /dev/mem
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Default memory file.
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.El
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.Sh SEE ALSO
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.Xr fstat 1 ,
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.Xr netstat 1 ,
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.Xr nfsstat 1 ,
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.Xr \&ps 1 ,
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.Xr systat 1 ,
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.Xr vmstat 1 ,
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.Xr pstat 8
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.Pp
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The sections starting with ``Interpreting system activity'' in
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.%T "Installing and Operating 4.3BSD" .
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.Sh HISTORY
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.Nm
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appeared in
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.At v6 .
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The
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.Fl x
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option was added in
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.Nx 1.4 .
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