allbery: > On 2009 Mar 3, at 12:31, mwin...@brocku.ca wrote: >> In both runs the same computations are done (sequentially resp. >> parallel), so the gc should be the same. But still using 2 cores is >> much slower than using 1 core (same program - no communication). > > The same GCs are done, but GC has to be done on a single core > (currently; parallel GC is in development) so you will see a lot more > lock contention when the GC kicks in. >
Assuming he is using GHC 6.10, the parallel GC is enabled by default when you use -Nn where n > 1. That's is -N4 will use -g4 (4 cores to collect). So GC should be the same or a little faster. -- Don _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
