On April 21, 2009 04:39:40 Simon Marlow wrote: > > These ratios match up like physical constants, or at least invariants of > > my Haskell implementation. However, the user time is constant on OS X, so > > these ratios reflect the actual parallel speedup on OS X. The user time > > climbs steadily on Linux, significantly diluting the parallel speedup on > > Linux. Somehow, whatever is going wrong in the interaction between > > Haskell and Linux is being captured in this increase in user time. > > We can't necessarily blame this on Linux: the two machines have > different hardware. There could be cache-effects at play, for > example.
Why not try booting a CD or thumb-drive linux distro (e.g., ubuntu live) on your 2.4 GHz Q6600 OS X box and see how things stack up. It would certainly eliminate any questions of hardware differences. Cheers! -Tyson
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