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SubjectRe: [PATCH] implement nice support across physical cpus on SMP
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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 :-(
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