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diff --git a/system_cmds/iostat.tproj/iostat.8 b/system_cmds/iostat.tproj/iostat.8 new file mode 100644 index 0000000..f79c834 --- /dev/null +++ b/system_cmds/iostat.tproj/iostat.8 @@ -0,0 +1,302 @@ +.\" +.\" Copyright (c) 1997 Kenneth D. Merry. +.\" 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. The name of the author may not be used to endorse or promote products +.\" derived from this software without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. +.\" +.\" $FreeBSD$ +.\" +.\" 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. +.\" +.\" @(#)iostat.8 8.1 (Berkeley) 6/6/93 +.\" +.Dd May 22, 2015 +.Dt IOSTAT 8 +.Os +.Sh NAME +.Nm iostat +.Nd report +.Tn I/O +statistics +.Sh SYNOPSIS +.Nm +.Op Fl CUdKIoT?\& +.Op Fl c Ar count +.Op Fl n Ar devs +.Op Fl w Ar wait +.Op Ar drives +.Sh DESCRIPTION +The +.Nm +utility displays kernel +.Tn I/O +statistics on terminal, device and cpu operations. +The first statistics that are printed are averaged over the system uptime. +To get information about the current activity, a suitable wait time should +be specified, so that the subsequent sets of printed statistics will be +averaged over that time. +.Pp +The options are as follows: +.Bl -tag -width flag +.It Fl ?\& +Display a usage statement and exit. +.It Fl c +Repeat the display +.Ar count +times. +If no +.Ar wait +interval is specified, the default is 1 second. +.It Fl C +Display CPU statistics. +This is on by default, unless +.Fl d +is specified. +.It Fl d +Display only device statistics. +If this flag is turned on, only device statistics will be displayed, unless +.Fl C +or +.Fl U +or +.Fl T +is also specified to enable the display of CPU, load average or TTY statistics. +.It Fl I +Display total statistics for a given time period, rather than average +statistics for each second during that time period. +.It Fl K +In the blocks transferred display (-o), display block count in kilobytes rather +then the device native block size. +.It Fl n +Display up to +.Ar devs +number of devices. +The +.Nm +utility will display fewer devices if there are not +.Ar devs +devices present. +.It Fl o +Display old-style +.Nm +device statistics. +Sectors per second, transfers per second, and milliseconds per seek are +displayed. +If +.Fl I +is specified, total blocks/sectors, total transfers, and +milliseconds per seek are displayed. +.It Fl T +Display TTY statistics. +This is on by default, unless +.Fl d +is specified. +.It Fl U +Display system load averages. +This is on by default, unless +.Fl d +is specified. +.It Fl w +Pause +.Ar wait +seconds between each display. +If no repeat +.Ar count +is specified, the default is infinity. +.El +.Pp +The +.Nm +utility 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 devices +Device operations. +The header of the field is the device name and unit number. +The +.Nm +utility +will display as many devices as will fit in a standard 80 column screen, or +the maximum number of devices in the system, whichever is smaller. +If +.Fl n +is specified on the command line, +.Nm +will display the smaller of the +requested number of devices, and the maximum number of devices in the system. +To force +.Nm +to display specific drives, their names may be supplied on the command +line. +The +.Nm +utility +will not display more devices than will fit in an 80 column screen, unless +the +.Fl n +argument is given on the command line to specify a maximum number of +devices to display, or the list of specified devices exceeds 80 columns. +If fewer devices are specified on the command line than will fit in an 80 +column screen, +.Nm +will show only the specified devices. +.Pp +The standard +.Nm +device display shows the following statistics: +.Pp +.Bl -tag -width indent -compact +.It KB/t +kilobytes per transfer +.It tps +transfers per second +.It MB/s +megabytes per second +.El +.Pp +The standard +.Nm +device display, with the +.Fl I +flag specified, shows the following statistics: +.Pp +.Bl -tag -width indent -compact +.It KB/t +kilobytes per transfer +.It xfrs +total number of transfers +.It MB +total number of megabytes transferred +.El +.Pp +The old-style +.Nm +display (using +.Fl o ) +shows the following statistics: +.Pp +.Bl -tag -width indent -compact +.It sps +sectors transferred per second +.It tps +transfers per second +.It msps +average milliseconds per transaction +.El +.Pp +The old-style +.Nm +display, with the +.Fl I +flag specified, shows the following statistics: +.Pp +.Bl -tag -width indent -compact +.It blk +total blocks/sectors transferred +.It xfr +total transfers +.It msps +average milliseconds per transaction +.El +.It cpu +.Bl -tag -width indent -compact +.It \&us +% of cpu time in user mode +.It \&sy +% of cpu time in system mode +.It \&id +% of cpu time in idle mode +.El +.El +.Sh EXAMPLES +.Dl iostat -w 1 disk0 disk2 +.Pp +Display statistics for the first and third disk devices device every +second ad infinitum. +.Pp +.Dl iostat -c 2 +.Pp +Display the statistics for the first four devices in the system twice, with +a one second display interval. +.Pp +.Dl iostat -Iw 3 +.Pp +Display total statistics every three seconds ad infinitum. +.Pp +.Dl iostat -odICTw 2 -c 9 +.Pp +Display total statistics using the old-style output format 9 times, with +a two second interval between each measurement/display. +The +.Fl d +flag generally disables the TTY and CPU displays, but since the +.Fl T +and +.Fl C +flags are given, the TTY and CPU displays will be displayed. +.Sh SEE ALSO +.Xr netstat 1 , +.Xr nfsstat 1 , +.Xr ps 1 , +.Xr top 1 , +.Xr vm_stat 1 +.Pp +The sections starting with ``Interpreting system activity'' in +.%T "Installing and Operating 4.3BSD" . +.Sh HISTORY +This version of +.Nm +first appeared in +.Fx 3.0 . |