Re: problem with nice values and cpu consumption in 2.6.11-5

[Kirill Korotaev]

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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