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1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
201 lines
5.5 KiB
Groff
201 lines
5.5 KiB
Groff
.\"
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.\" Copyright (c) 1994, Henrik Vestergaard Draboel
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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 Henrik Vestergaard Draboel.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd July 23, 1994
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.Dt RTPRIO 1
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.Os
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.Sh NAME
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.Nm rtprio ,
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.Nm idprio
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.Nd execute, examine or modify a utilitys or process realtime
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or idletime scheduling priority
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.Sh SYNOPSIS
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.Nm [id|rt]prio
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.Nm [id|rt]prio
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.Ar pid
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.Nm [id|rt]prio
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.Ar priority
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.Ar command
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.Op args
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.Nm [id|rt]prio
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.Ar priority
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.Ar -pid
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.Nm [id|rt]prio
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.Ar -t
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.Ar command
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.Op args
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.Nm [id|rt]prio
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.Ar -t
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.Ar -pid
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.Sh DESCRIPTION
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.Nm Rtprio
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is used for controlling realtime process scheduling.
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.Nm Idprio
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is used for controlling idletime process scheduling, and can be called
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with the same options as
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.Nm Rtprio .
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A process with a realtime priority is not subject to priority
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degradation, and will only be preempted by another process of equal or
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higher realtime priority.
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A process with an idle priority will run only when no other
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process is runnable and then only if it's idle priority is equal or
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greater than all other runnable idle priority processes.
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.Nm Rtprio
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or
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.Nm Idprio
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when called without arguments will return the realtime priority
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of the current process.
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If
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.Nm rtprio
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is called with 1 argument, it will return the realtime priority
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of the process with the specified
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.Ar pid .
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If
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.Ar priority
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is specified, the process or program is run at that realtime priority.
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If
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.Ar -t
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is specified, the process or program is run as a normal (non-realtime)
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process.
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If
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.Ar -pid
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is specified, the process with the process identifier "pid" will be
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modified, else if
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.Ar command
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is specified, that program is run with its arguments.
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.Ar Priority
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is an integer between 0 and RTP_PRIO_MAX (usually 31). 0 is the
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highest priority
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.Ar Pid
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of 0 means "the current process".
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Only root is allowed to set realtime priorities. Non-root processes may
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set idle priority levels for the current process only.
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.Sh RETURN VALUE
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If
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.Nm rtprio
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execute a command, the exit value is that of the command executed.
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In all other cases,
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.Nm
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exits with 0 for success and 1 for all other errors.
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.Sh EXAMPLES
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.\LP
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To see which realtime priority the current process is at:
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.Bd -literal -offset indent -compact
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\fBrtprio\fP
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.Ed
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.\.LP
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To see which realtime priority of process \fI1423\fP:
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.Bd -literal -offset indent -compact
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\fBrtprio 1423\fP
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.Ed
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.\.LP
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To run \fIcron\fP at the lowest realtime priority:
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.Bd -literal -offset indent -compact
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\fBrtprio 31 cron\fP
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.Ed
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.\.LP
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To change the realtime priority of process \fI1423\fP to \fI16\fP:
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.Bd -literal -offset indent -compact
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\fBrtprio 16 -1423\fP
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.Ed
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.\.LP
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To run \fItcpdump\fP without realtime priority:
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.Bd -literal -offset indent -compact
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\fBrtprio -t tcpdump\fP
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.Ed
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.\.LP
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To change the realtime priority of process \fI1423\fP to RTP_PRIO_NORMAL
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(non-realtime/"normal" priority):
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.Bd -literal -offset indent -compact
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\fBrtprio -t -1423\fP
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.Ed
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.\.LP
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To make depend while not disturbing other machine usage:
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.Bd -literal -offset indent -compact
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\fBidprio 31 make depend\fP
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.Ed
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.Sh SEE ALSO
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.Xr rtprio 2 ,
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.Xr nice 1 ,
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.Xr ps 1 ,
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.Xr setpriority 2 ,
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.Xr nice 3 ,
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.Xr renice 8
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.Sh HISTORY
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The
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.Nm rtprio
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utility appeared in
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.Fx 2.0 ,
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but is similar to the HP-UX version.
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.Sh CAVEATS
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You can lock yourself out of the system by placing a cpu-heavy
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process in a realtime priority.
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.Sh BUGS
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There is no way to set/view the realtime priority of process 0
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(swapper) (see ps(1)).
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There is in
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.Tn FreeBSD
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no way to ensure that a process page is present in memory therefore
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the process may be stopped for pagein. (See mprotect(2), madvise(2)).
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Under
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.Tn FreeBSD
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system calls are currently never preempted, therefore non-realtime
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processes can starve realtime processes, or idletime processes can
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starve normal priority processes.
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Others ...
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.Sh AUTHOR
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Henrik Vestergaard Draboel - hvd@terry.ping.dk is the original author. This
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implementation in
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.Tn FreeBSD
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was substantially rewritten by David Greenman.
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