From: Kirill Korotaev <dev@sw.ru>
To: Carlos Carvalho <carlos@fisica.ufpr.br>
Cc: linux-kernel@vger.kernel.org
Subject: Re: problem with nice values and cpu consumption in 2.6.11-5
Date: Wed, 04 May 2005 15:52:18 +0400 [thread overview]
Message-ID: <4278B772.5080806@sw.ru> (raw)
In-Reply-To: <17015.35256.12650.37887@fisica.ufpr.br>
This is a real problem with O(1)-scheduler in 2.6... :(
The only workaround for you right now is to run 2.4 or move to some type
of virtualization solutions with fair cpu scheduler...
Kirill
> Look at this cpu usage in a two-processor machine:
>
> 893 user1 39 19 7212 5892 492 R 99.7 1.1 3694:29 mi41
> 1118 user2 25 0 155m 61m 624 R 50.0 12.3 857:54.18 b170-se.x
> 1186 user3 25 0 155m 62m 640 R 50.2 12.3 103:25.22 b170-se.x
>
> The job with nice 19 seems to be using 100% of cpu time while the
> other two nice 0 jobs share a single processor with 50% only. This is
> persistent, not a transient. I did a kill -STOP to the nice 19 job and
> a kill -CONT, and for a while it decreased the cpu usage but later
> returned to the above.
>
> This is with kernel 2.6.11-5 and top 3.2.5. What's the reason for this
> (apparent??) mis-behavior and how can I correct it? This is important
> because the machine is used for number-crunching and users get really
> upset when they don't get the expected share of cpu time...
> -
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next prev parent reply other threads:[~2005-05-04 11:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-03 14:24 problem with nice values and cpu consumption in 2.6.11-5 Carlos Carvalho
2005-05-04 11:52 ` Kirill Korotaev [this message]
2005-05-04 12:12 ` Con Kolivas
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