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SubjectRe: Scheduling with Hyperthreading
  Mark

I would to a quick snap with top, and when I saw 99.9% I assumed the the
process had
been there during the time top was starting up.

Looking at /proc/(pid)/cpu, shows that with two jobs running they are
sticking to cpu 0 and 1
which are siblings




Regards

Mike

Mark Hahn wrote:

>>that if I run two compute intensive jobs on a Dual Xeon, the processes
>>run on separate
>>physical cpus and can spend a significant amount of time with both on a
>>single
>>cpu.
>>
>>
>
>how did you determine this? running another program, such as top,
>will naturally disturb the scheduler and corrupt any observations.
>the only means I can think of is to look in /proc/<pid>/cpu near
>very infrequently (ideally, just before the processes exit.)
>or is this what you've done?
>
>

--
----------------------------------------------------------------------
Mike Sullivan Director Performance Computing
@lliance Technologies, Voice: (416) 385-3255,
18 Wynford Dr, Suite 407 Fax: (416) 385-1774
Toronto, ON, Canada, M3C-3S2 Toll Free:1-877-216-3199
http://www.alltec.com



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