135 lines
3.8 KiB
Groff
135 lines
3.8 KiB
Groff
.\" Copyright (c) 1985, 1991 The Regents of the University of California.
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.\" 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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.\" @(#)iostat.8 6.8 (Berkeley) 4/24/91
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.\"
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.TH IOSTAT 8 "April 24, 1991"
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.UC 4
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.SH NAME
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iostat \- report I/O statistics
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.SH SYNOPSIS
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.nf
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.ft B
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iostat [ \-c count ] [ \-M core ] [ \-N system ]
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.ti +5
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[ \-w wait ] [ drives ]
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.ft R
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.fi
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.SH DESCRIPTION
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.I Iostat
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reports certain kernel statistics kept about terminal, disk and cpu
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activity.
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.PP
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The options are as follows:
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.TP
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\-c
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Repeat the display
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.I count
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times.
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The first display is for the time since a reboot and each subsequent
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report is for the time period since the last display.
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If no
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.I wait
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interval is specified, the default is 1 second.
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.TP
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\-M
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Extract values associated with the name list from the specified core
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instead of the default ``/dev/kmem''.
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.TP
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\-N
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Extract the name list from the specified system instead of the default
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``/vmunix''.
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.TP
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\-w
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Pause
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.I wait
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seconds between each display.
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If no repeat
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.I count
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is specified, the default is infinity.
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.PP
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.I Iostat
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displays its information in the following format:
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.TP
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tty
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.nf
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.RS
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tin characters read from terminals
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tout characters written to terminals
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.RE
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.fi
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.TP
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disks
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Disk operations (this field is system dependent).
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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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.I iostat
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displays only the first four drives.
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To force
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.I iostat
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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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.sp
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.nf
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.RS
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sps sectors transferred per second
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tps transfers per second
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msps milliseconds per average seek (including implied
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seeks and rotational latency)
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.RE
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.fi
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.TP
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cpu
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.nf
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.RS
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us % of cpu time in user mode
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ni % of cpu time in user mode running niced processes
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sy % of cpu time in system mode
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id % of cpu time in idle mode
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.RE
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.fi
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.SH FILES
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.ta \w'/dev/kmem 'u
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/vmunix default kernel namelist
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.br
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/dev/kmem default memory file
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.SH SEE ALSO
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.IR fstat (1),
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.IR netstat (1),
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.IR nfsstat (1),
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.IR ps (1),
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.IR systat (1),
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.IR vmstat (1),
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.IR pstat (8)
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.sp
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The sections starting with ``Interpreting system activity'' in
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.IR "Installing and Operating 4.3BSD" .
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