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 -- Best regards, Bulat mailto:bulat.zigans...@gmail.com _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
