limit cpu

limit cpu

[Eduardo Cortés]

hi,
i want to know if linux can limit the max cpu usage (not cpu time) per user, 
like freebsd login classes. I see /etc/security/limits.conf and ulimit from 
bash, but they limit the max cpu time, not de max cpu usage (%cpu). 
Thanks.

Re: limit cpu

[Wes Felter]

On 16 Aug 2001 03:21:58 +0200, Eduardo Cortés wrote:
> hi,
> i want to know if linux can limit the max cpu usage (not cpu time) per user, 
> like freebsd login classes. I see /etc/security/limits.conf and ulimit from 
> bash, but they limit the max cpu time, not de max cpu usage (%cpu). 

There are a couple of patches:

http://www.cs.umass.edu/~lass/software/qlinux/
http://fairsched.sourceforge.net/
http://www.surriel.com/patches/2.3/2.3.99-3-schedpatch5

Wes Felter
System Software Department
IBM Austin Research Lab
11400 Burnet Rd., Austin, TX 78758
Tel 512-838-7933

Re: limit cpu

[Szabolcs Szakacsits]

On 16 Aug 2001, Wes Felter wrote:
> On 16 Aug 2001 03:21:58 +0200, Eduardo Cortés wrote:
> > i want to know if linux can limit the max cpu usage (not cpu time) per user,
> > like freebsd login classes. I see /etc/security/limits.conf and ulimit from
> > bash, but they limit the max cpu time, not de max cpu usage (%cpu).
> There are a couple of patches:

A quick summary below, maybe somebody wants to work on this issue,

> http://www.cs.umass.edu/~lass/software/qlinux/

Last modified: Thu Jul 1 14:52:41 EDT 1999
it patches neither 2.2.19 nor 2.4.9 (or other recent kernels)

> http://fairsched.sourceforge.net/

Last updated on 11 July 2000
it patches neither 2.2.19 nor 2.4.9 (or other recent kernels)

> http://www.surriel.com/patches/2.3/2.3.99-3-schedpatch5

Last modified: Tue Apr  4 15:43:40 2000
it patches neither 2.2.19 nor 2.4.9 (or other recent kernels)

Eduardo, as it was mentioned before, you can "mimic" CPU usage
limitation using the 'priority' item in /etc/security/limits.conf that's
basically sets the nice(1) values. It made some people happy.

	Szaka