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Gentoo's Bugzilla – Attachment 78409 Details for
Bug 120807
[bump] sys-process/schedutils-1.5.0
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files/ionice.1
ionice.1 (text/plain), 2.27 KB, created by
TGL
on 2006-01-29 04:14:05 UTC
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files/ionice.1
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TGL
Created:
2006-01-29 04:14:05 UTC
Size:
2.27 KB
patch
obsolete
>.TH ionice "1" "August 2005" ionice >.SH NAME >ionice \- get/set program io scheduling class and priority >.SH SYNOPSIS >.B ionice >[\fI-c\fR] \fI[-n\fR] [\fI-p\fR] [COMMAND [ARG...]] > >.SH DESCRIPTION >This program sets the io scheduling class and priority for a program. As of >this writing, Linux supports 3 scheduling classes: > >\fBIdle\fR. >A program running with idle io priority will only get disk time when no other >program has asked for disk io for a defined grace period. The impact of idle >io processes on normal system activity should be zero. This scheduling >class does not take a priority argument. > >\fBBest effort\fR. >This is the default scheduling class for any process that hasn't asked for >a specific io priority. Programs inherit the CPU nice setting for io >priorities. This class takes a priority argument from \fI0-7\fR, with lower >number being higher priority. Programs running at the same best effort >priority are served in a round-robin fashion. > >\fBReal time\fR. >The RT scheduling class is given first access to the disk, regardless of >what else is going on in the system. Thus the RT class needs to be used with >some care, as it can starve other processes. As with the best effort class, >8 priority levels are defined denoting how big a time slice a given process >will receive on each scheduling window. > >If no arguments or just \fI-p\fR is given, \fIionice\fR will query the >current io scheduling class and priority for that process. > >.SH OPTIONS >.LP >.TP 7 >\fB-c\fP >The scheduling class. 1 for real time, 2 for best-effort, 3 for idle. >.TP 7 >\fB-n\fP >The scheduling class data. This defines the class data, if the class >accepts an argument. For real time and best-effort, \fI0-7\fR is valid >data. >.TP 7 >\fB-p\fP >Pass in a process pid to change an already running process. If this argument >is not given, \fBionice\fP will run the listed program with the given >parameters. > >.SH EXAMPLES >.LP >.TP 7 ># \fBionice\fP -c3 -p89 >.TP 7 >Sets process with PID 89 as an idle io process. >.TP 7 ># \fBionice\fP -c2 -n0 bash >.TP 7 >Runs 'bash' as a best-effort program with highest priority. >.TP 7 ># \fBionice\fP -p89 >.TP 7 >Returns the class and priority of the process with PID 89. > >.SH NOTES >Linux supports io scheduling priorities and classes since 2.6.13 with the CFQ >io scheduler. > >.SH AUTHORS >Jens Axboe <axboe@suse.de>
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bug 120807
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