Subj : Re: threads do not get cpa
To   : comp.programming.threads
From : Joe Seigh
Date : Sun Aug 07 2005 08:02 am

azb123@planet.nl wrote:
> Hello,
> I've tried the code posted below on an SGI Origin (16 cpus) and a SGI
> Altix (32 cpus). The program runs and gives the expected results, but
> it always gets less cpus than active threads (on an otherwise empty
> machine).
> 
> If three threads are requested, top shows about 200% activity, if 6
> threads are requested, the activity goes up to 400%. I do not
> understand why the activity reported by top is less than the number of
> active threads. I would expect top reporting an activity of 300% for
> three active threads.
> 
> BTW, I have exeprimented with changing the thread's scope and
> scheduling policy, but could not really change the above behaviour.
> 
> Any ideas what is happening?
> 
Try pthread_setconcurrency() and see if that has any effect.

-- 
Joe Seigh

When you get lemons, you make lemonade.
When you get hardware, you make software.

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