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SubjectRe: [PATCH] implement nice support across physical cpus on SMP
Date
On Sun, 8 May 2005 03:59, Carlos Carvalho wrote:
> Con Kolivas (kernel@kolivas.org) wrote on 7 May 2005 23:42:
> >SMP balancing is currently designed purely with throughput in mind. This
> >working patch implements a mechanism for supporting 'nice' across
> > physical cpus without impacting throughput.
> >
> >This is a version for stable kernel 2.6.11.*
> >
> >Carlos, if you could test this with your test case it would be
> > appreciated.
>
> Unfortunately it doesn't seem to have any effect:
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 184 user1 39 19 7220 5924 520 R 99.9 1.1 209:40.68 mi41
> 266 user2 25 0 1760 480 420 R 50.5 0.1 86:36.31 xdipole1
> 227 user3 25 0 155m 62m 640 R 49.5 12.3 95:07.89 b170-se.x
>
> Note that the nice 19 job monopolizes one processor while the other
> two nice 0 ones share a single processor.
>
> This is really a showstopper for this kind of application :-(

Ok back to the drawing board. I have to try and figure out why it doesn't work
for your case. I tried it on 4x with lots of cpu bound tasks so I'm not sure
why it doesn't help with tyours.

Cheers,
Con
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