Author: Russell Reagan
Date: 18:08:30 10/12/04
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On October 12, 2004 at 19:32:44, stuart taylor wrote: >I thought we were all waiting for 64-bit programming which might have made it 4 >times as fast, wouldn't it? Or at least a bit better, and I just can't >understand why it is not designed to take advantage of the most recent hardware >cpu advances, of about a year ago. I wouldn't expect Tiger to be released as an AMD64 program at this time. I doubt it is significantly faster on AMD64, and it doesn't make sense from a business point of view at this time. Tiger is not a bitboard program. Non-bitboard programs are very hit and miss when it comes to the "64-bit bonus". Some get a modest speedup and some get no speedup, but I don't know of any that gets a significant speedup. It may well be that 32-bit hardware is the fastest for Tiger at this point in time, especially considering that the best compilers for AMD64 are either still in beta form (ex. Microsoft) or something like gcc. I also don't know of any chess program which runs four times faster because of AMD64 hardware. Crafty, for instance, runs about 60% faster on the Opteron compared to an equivalently clocked 32-bit Athlon. It is highly improbable that Tiger would gain more from 64-bit hardware than Crafty, unless Tiger has become a bitboard program, but I *seriously* doubt that :) From a business point of view it doesn't make sense either. Not many people have AMD64 machines, and even fewer have Windows for AMD64 (and most of them have a beta version).
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