204 lines
5.0 KiB
Groff
204 lines
5.0 KiB
Groff
.\" $NetBSD: iostat.8,v 1.23 2014/06/11 17:01:04 joerg Exp $
|
|
.\"
|
|
.\" Copyright (c) 1985, 1991, 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. 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.
|
|
.\"
|
|
.\" from: @(#)iostat.8 8.1 (Berkeley) 6/6/93
|
|
.\"
|
|
.Dd June 11, 2014
|
|
.Dt IOSTAT 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm iostat
|
|
.Nd report
|
|
.Tn I/O
|
|
statistics
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl CdDITx
|
|
.Op Fl c Ar count
|
|
.Op Fl w Ar wait
|
|
.Op Ar drives
|
|
.Sh DESCRIPTION
|
|
.Nm
|
|
displays kernel
|
|
.Tn I/O
|
|
statistics on terminal, disk and CPU operations.
|
|
By default,
|
|
.Nm
|
|
displays one line of statistics averaged over the machine's run time.
|
|
The use of
|
|
.Fl c
|
|
presents successive lines averaged over the
|
|
.Ar wait
|
|
period.
|
|
The
|
|
.Fl I
|
|
option causes
|
|
.Nm
|
|
to print raw, unaveraged values.
|
|
.Pp
|
|
Only the last disk option specified
|
|
.Fl ( d ,
|
|
.Fl D ,
|
|
or
|
|
.Fl x )
|
|
is used.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width XNXsystemX
|
|
.It Fl c Ar count
|
|
Repeat the display
|
|
.Ar count
|
|
times.
|
|
Unless the
|
|
.Fl I
|
|
flag is in effect, 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
|
|
.Ar wait
|
|
interval is specified, the default is 1 second.
|
|
.It Fl C
|
|
Show CPU statistics.
|
|
This is enabled by default unless the
|
|
.Fl d ,
|
|
.Fl D ,
|
|
.Fl T ,
|
|
or
|
|
.Fl x
|
|
flags are used.
|
|
.It Fl d
|
|
Show disk statistics.
|
|
This is the default.
|
|
Displays kilobytes per
|
|
transfer, number of transfers, and megabytes transferred.
|
|
Use of this flag disables display of CPU and tty statistics.
|
|
.It Fl D
|
|
Show alternative disk statistics.
|
|
Displays kilobytes transferred, number of
|
|
transfers, and time spent in transfers.
|
|
Use of this flag disables the default display.
|
|
.It Fl I
|
|
Show the running total values, rather than an average.
|
|
.It Fl T
|
|
Show tty statistics.
|
|
This is enabled by default unless the
|
|
.Fl C ,
|
|
.Fl d ,
|
|
or
|
|
.Fl D
|
|
flags are used.
|
|
.It Fl w Ar wait
|
|
Pause
|
|
.Ar wait
|
|
seconds between each display.
|
|
If no repeat
|
|
.Ar count
|
|
is specified, the default is infinity.
|
|
.It Fl x
|
|
Show extended disk statistics.
|
|
Each disk is displayed on a line of its own with all available
|
|
statistics.
|
|
This option overrides all other display options, and all
|
|
disks are displayed unless specific disks
|
|
are provided as arguments.
|
|
Additionally, separate read and write statistics are displayed.
|
|
.El
|
|
.Pp
|
|
.Nm
|
|
displays its information in the following format:
|
|
.Bl -tag -width flag
|
|
.It tty
|
|
.Bl -tag -width indent -compact
|
|
.It tin
|
|
characters read from terminals
|
|
.It tout
|
|
characters written to terminals
|
|
.El
|
|
.It disks
|
|
Disk operations.
|
|
The header of the field is the disk name and unit number.
|
|
If more than four disk drives are configured in the system,
|
|
.Nm
|
|
displays only the first four drives.
|
|
To force
|
|
.Nm
|
|
to display specific drives, their names may be supplied on the command
|
|
line.
|
|
.Pp
|
|
.Bl -tag -width indent -compact
|
|
.It KB/t
|
|
Kilobytes transferred per disk transfer
|
|
.It t/s
|
|
transfers per second
|
|
.It MB/s
|
|
Megabytes transferred per second
|
|
.Pp
|
|
.El
|
|
The alternative display format, (selected with
|
|
.Fl D ) ,
|
|
presents the following values.
|
|
.Bl -tag -width indent -compact
|
|
.It KB
|
|
Kilobytes transferred
|
|
.It xfr
|
|
Disk transfers
|
|
.It time
|
|
Seconds spent in disk activity
|
|
.El
|
|
.It cpu
|
|
.Bl -tag -width indent -compact
|
|
.It \&us
|
|
% of CPU time in user mode
|
|
.It \&ni
|
|
% of CPU time in user mode running niced processes
|
|
.It \&sy
|
|
% of CPU time in system mode
|
|
.It \&id
|
|
% of CPU time in idle mode
|
|
.El
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr fstat 1 ,
|
|
.Xr netstat 1 ,
|
|
.Xr nfsstat 1 ,
|
|
.Xr \&ps 1 ,
|
|
.Xr systat 1 ,
|
|
.Xr vmstat 1 ,
|
|
.Xr pstat 8
|
|
.Pp
|
|
The sections starting with ``Interpreting system activity'' in
|
|
.%T "Installing and Operating 4.3BSD" .
|
|
.Sh HISTORY
|
|
.Nm
|
|
appeared in
|
|
.At v6 .
|
|
The
|
|
.Fl x
|
|
option was added in
|
|
.Nx 1.4 .
|