NAME
reniced - renice running processes based on regular expressions
SYNOPSIS
reniced [-h] [-v] [configfile]
OVERVIEW
reniced takes a list of regular expressions, looks for processes (and
threads) matching them and renices the processes to given values.
reniced can also change io priorities.
DESCRIPTION
On start, reniced reads a configuration file. It consists of nice
values and regular expressions.
It then scans the process table using the ps(1) command. Whenever a
process name from the CMD column matches a regular expression, that
process is reniced to the given value. If a process matches multiple
regular expressions, all rule matches are executed in order and the
last match wins.
When run as root, reniced will scan all processes (‘ps H -e‘). When
run as a user, renice only scans the user’s processes (‘ps H --user‘).
Switches
-h This prints the version number and a short help text.
-v This activates verbose mode. Error messages, some statistics and
all renice actions are printed to stdout.
configfile
This reads the regular expressions from an alternate configfile.
The default location of the configfile is "/etc/reniced.conf" if
reniced is run as root, "~/.reniced" otherwise.
Configuration file format
The configuration file is composed of single lines. Empty lines and
lines starting with a # are ignored.
Every line must consist of a command followed by a whitespace and a
Perl regular expression.
The command consists of a nice value, an io prority or both. A nice
value is given as a decimal, usually within the range of -20 to 19. An
io priority consists of the scheduling class (r for realtime, b for
best-effort and i for idle) optionally followed by the class data
(typically 0-7, lower being higher priority).
Examples
5 ^bash
gives currently running bash shells a nice value of 5
b2 ^tar
sets currently running to io priority best-effort within class 2
i torrent
sets currently running torrent-like applications to io priority
idle
-10r4 seti
gives currently running seti-processes a nice value of -10 and
sets them to realtime io priority in class 4
MODULES NEEDED
use BSD::Resource;
This module can be obtained from <http://www.cpan.org>.
PROGRAMS NEEDED
ionice
ionice is only needed if you want to change io priority. It can be
obtained from <http://rlove.org/schedutils/>.
You also need a suitable kernel and scheduler, e.g. Linux 2.6 with CFQ.
BUGS
reniced can run without the BSD::Resource module. In this case, the
PRIO_PROCESS is set to 0. This works on Linux 2.6.11 i686 but it could
break on other systems. Installing BSD::Resource is the safer way.
Be careful using realtime priorities, don’t starve other tasks.
Please report bugs to <mitch@cgarbs.de>.
AUTHOR
reniced was written by Christian Garbs <mitch@cgarbs.de>.
COPYRIGHT
reniced is Copyright (C) 2005,2007 by Christian Garbs. It is licensed
under the GNU GPL.
AVAILABILITY
Look for updates ad <http://www.cgarbs.de/stuff.en.html>.
SEE ALSO
ionice(1), renice(1)