On 27/04/2009 11:29, Bulat Ziganshin wrote:
Hello Simon,
Monday, April 27, 2009, 2:13:26 PM, you wrote:
This is a very strange result: the user time should not *decrease*, but
rather should stay the same or increase a bit when adding cores. If
ability to run two threads simultaneous may increase performance in
some scenarios. one example is consumer+producer threads. with 2
OS threads all produced data are consumed immediately, so we live
inside L2 cache. with 1 OS thread produced data overflow the cache
before threads are switched, making execution much slower
Yes, good point. Though I'd be surprised if that was happening here.
Cheers,
Simon
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