Re: CPU limits
- From: xhoster@xxxxxxxxx
- Date: 07 Nov 2007 19:46:35 GMT
"alexxx.magni@xxxxxxxxx" <alexxx.magni@xxxxxxxxx> wrote:
Inspired by the recent posting of "FAQ 8.39 How do I set CPU limits?",
I hoped to solve this problem, that I always had with computationally
intensive scripts - namely that the CPU usage goes to 100%, and a very
noisy fan starts.
I'd much prefer to be able to set my script's CPU usage at - say - 75%
or similar...
In the FAQ I saw that this possibility is in the BSD::Resource module,
but unfortunately I work in Linux.
BSD::Resource works under Linux. Or at least some (I expect all or most)
parts of it do. So I don't think that that is a problem.
Moreover, I'm not certain that even under BSD this could be possible:
setrlimit seems to allow you just to kill processes going beyond your
given threshold.
Yes, that is the problem. I don't know of any facility on any OS that does
this (but I haven't looked very hard.) I guess you could write a
baby-sitter process which goes into a loop where it sleeps for 3N
microseconds, then issues a kill STOP to your real process, then sleeps for
N microseconds, then issues a kill CONT to your real process. That should
restrict it to 75% CPU time. If your main program uses other types of
signals, this might not work very well.
Xho
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