Re: SMP Affinity and nice

From: Peter Williams
Date: Wed Aug 23 2006 - 21:27:39 EST

Jan Engelhardt wrote:
Subject: SMP Affinity and nice

I am trying to come to an understanding as to why 1 process is getting
less cpu time than identical processes with a higher "nice" value.
Server has 2 physical processors with hyperthreading (cpu 0,1,2,3)

I am starting 5 processes that perform a square root loop to max out a
cpu. They use the exact same code but are renamed for identification:
cpumax1, cpumax2, cpumax3, cpumax4, cpumax5

What you describe should be addressed in the -ck patchset (smpnice-...diff) Not sure if it is in mainline already, though.

It's coming in 2.6.18.

What kernel version are you using when you see this phenomenon?

Peter Williams pwil3058@xxxxxxxxxxxxxx

"Learning, n. The kind of ignorance distinguishing the studious."
-- Ambrose Bierce
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