Messages in this thread | | | Date | Wed, 20 Sep 2006 09:42:53 +0200 | From | Ludovic Drolez <> | Subject | Re: [PATCH] sched.c: Be a bit more conservative in SMP |
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Antonio Vargas wrote: > A variant on this theme would be (not tested or somewhat, just a > random idea for considering): > > 1. find if the process is a cpu-hog, if not then ignore > > 2. find somehow how much time has this process on it's current cpu > > 3. then, instead of always substracting 1 from th current load on the > current cpu, substract for example 1...0 when running from 0 to 60 > seconds... this way cpu hogs would only rotate slowly? > > in code: > > number_to_sub_from_queue_load = (256 - min(256, > time_from_last_change_of_cpu)) >> 8; > > somehow managing to get fixedpoint loadlevels on the runqueues would > make this work better.... >
Yes ! That might be a better idea ! In fact, I tested the 1st patch on our cluster (Finite elements computing on 8 CPUs): - Under Windows: 875 seconds - Linux 2.6.16 : 1019 s - Linux 2.6.16 + manual taskset : 842 s - Linux 2.6.16 + Vincent's patch : 1373 s :-(
If you find time to write a patch, Antonio, I would be pleased to try it !
Cheers,
-- Ludovic DROLEZ http://lrs.linbox.org - Free asset management software - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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