2013/3/5 Nathan Howell <[email protected]> > Depends on the application, of course. The (on by default) parallel GC > tends to kill performance for me... you might try running both with "+RTS > -sstderr" to see if GC time is significantly higher, and try adding "+RTS > -qg1" if it is. >
You are correct: parallel GC is slowing computation down. After some experiments I can produce two behaviors: use single threaded GC (multithreaded version is slowed down by factor of 5 - but single threaded backs to normal) or increase heap size (multithreaded version slows down by factor of 2, single threaded version runs normally). I guess I must live with this ;) -- Łukasz Dąbek
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