Author: Sune Fischer
Date: 04:45:58 12/04/03
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On December 04, 2003 at 01:40:11, Russell Reagan wrote: >On December 03, 2003 at 22:51:43, Sune Fischer wrote: > >>>Clock for clock, Crafty is about 60% faster on 64-bit hardware. IE a 2GHz >>>Opteron would run Crafty about 60% faster than a 2GHz 32-bit Athlon. Gian Carlo >>>reported that Sjeng ran 70% faster, clock for clock. >> >>The Opteron has lots of improvements other than the 64 bit thing, so it is still >>not exactly known what is contributing where for Crafty. >> >>I suspect Crafty would get a good speedup on a 32-bit Athlon too if it had 1 MB >>cache and more registers, this should somehow be factored out. >> >>Granted that's not easy to do, but if/when we manage to take a handfull of >>bitboard programs and compare their speedup to a handfull of non-bitboard >>programs, then we might get a better impression of how much the 64-bit thing is >>an issue on the overall. >> >>It is also possible that the first generation chess programs and compilers won't >>be optimal. First tests are often 'worst case' senarios. > >I didn't say that the speedup was due only to the 64-bit nature of Crafty. I >just said there was a 60% speedup :) Okay, "Crafty is about 60% faster on 64-bit hardware" gave me the wrong impression then :) It's just that I would expect each of the new innovations in the Opteron to bring a good speedup, and while the 64 bit stuff definitely is the most "interesting" I'm not sure it is also the most significant. That huge speedup Sjeng gets, assuming Sjeng isn't largely bitboard based, indicates that other factors may be equally important. -S.
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