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SubjectRe: increasing page size
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Adding processor affinity should be straightforward.  I believe that Linux
only has 1 process queue right now. The most performance oriented method to
do this would be to move the process to a processor specific queue. Reality
dictates that you will incurr more contention on the process queue with the
more processors you have.

--Perry

>
> : Does Mr McVoy by any chance happen to have an "is L2 cache shared" detector
> : lurking in the lmbench and other magic ?
>
> Hmm. Not as such. I could probably make one. It would be a lot easier
> if Linux had a pin() function which pinned a process to a processor.
> SGI's interface looks like:
>
> sysmp(MP_MUSTRUN, cpuNumber);
>
> If I had that sucker, then I could pin two processes to two different
> processors, timing how long it took to touch powers of two size arrays
> with one process, then do the same thing with two processes. It shouldn't
> make any difference until you get out to >L2$ sizes if the caches are
> unshared.
>
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>


--
Perry Harrington Linux rules all OSes. APSoft ()
email: perry@apsoft.com Think Blue. /\

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