On Sun, Feb 17, 2008 at 03:41:52AM +0300, Ruslan Evdokimov wrote: > 2008/2/17, Stefan O'Rear <[EMAIL PROTECTED]>: > > > This makes perfect sense - -N2 tells GHC to use two threads, and if you > > run two threads on a single-processor system it's implemented by running > > the threads alternatingly (around 100/s for modern Linux, probably > > similar for other systems). Thus, the two evaluations never get more > > than a hundreth of a second out of step, and memory usage is still low. > > > > Stefan > > Test on windows XP AthlonX2 4200+ 2Gb: > > C:\imp>test > 1 > 12328 ms > > C:\imp>test +RTS -N2 > 1 > 5234 ms > > C:\imp>test +RTS -N2 > 1 > 3515 ms > > 1st - 1 thread > 2nd - 2 threads on single core (one core disabled through Task Manager) > 3rd - 2 threads on different cores
As far as I can tell, that confirms my explanation. If you see it differently - say how. Stefan
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