166 lines
4.5 KiB
Groff
166 lines
4.5 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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.\" $Id: rtprio.1,v 1.1 1994/09/01 12:05:13 davidg Exp $
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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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.Nd execute, examine or modify a process's realtime scheduling priority
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.Sh SYNOPSIS
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.Nm rtprio
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.Nm rtprio
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.Ar pid
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.Nm rtprio
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.Ar priority
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.Ar command
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.Op args
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.Nm rtprio
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.Ar priority
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.Ar -pid
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.Nm rtprio
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.Ar -t
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.Ar command
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.Op args
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.Nm rtprio
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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. A process with a
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realtime priority is not subject to priority degradation, and will only
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be preempted by another process of equal or higher realtime priority.
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.Nm Rtprio
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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 that pid will be modified, else
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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 (RTPRIO_MIN) and 31 (RTPRIO_MAX). 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.
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.Sh RETURN VALUE
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.Nm rtprio
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returns the (new) realtime priority of the process (see rtprio(2)), or
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-1 for all usage 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 RTRIO_RTOFF
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(no realtime):
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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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.Sh DIAGNOSTICS
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The
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.Nm rtprio
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utility shall exit with value of the (new) realtime priority of the
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program.
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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 nice 2 ,
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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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FreeBSD 2.0,
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but is similar to the HP-UX version.
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.Sh BUGS
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You can lock yourself out of the system by placing a cpu-intensive
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process into realtime priority.
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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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Others ...
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.Sh AUTHOR
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Henrik Vestergaard Draboel - hvd@terry.ping.dk
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