Author: Dann Corbit
Date: 16:51:28 02/06/02
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On February 06, 2002 at 19:32:39, ALI MIRAFZALI wrote: >On February 06, 2002 at 19:28:21, Frank Nelson wrote: > >>On February 06, 2002 at 17:48:52, walter irvin wrote: >> >>>i wonder if a 2ghz pc with the latest crafty beat the cray blitz that won the >>>world champoinship ?????????? >>> >>>my vote is with crafty >> >>You are forgetting that cray blitz was runned on a supercomputer at many >>m.i.p.s. than that which a home pc can acheive. So my bets are with cray blitz! >Actually your last Statementis not True.A 2 gig Home PC has more m.i.p.s then >the old Supercomputers which ran Cray Blitz. Cray Blitz ran on a C94, which was a 1000 MIP machine. Not too shabby, even by todays standards. A 2GHz AMD will be a little over 2000 MFlops (which is what the MIPS above are measuring). So it seems that the PC should be twice as fast. But when you look at the memory speed for things like the hash table the Cray is enormously faster. And the disk access for tablebase files would benefit incredibly. However, the old Cray Blitz did not use tablebase files, so that is neither here nor there. Other plus factors for the Cray include a vector unit that can do lots of operations in parallel. In any case, it would be a fair fight, and I'm not sure which program would win. I suspect the increased sophistication of the PC program would win out, because so much more development and debugging has been done on that platform. My extrapolation (read:guess) is that the old cray would search wider and the new crafty would search deeper. So if the new crafty stayed out of trouble it would probably have the better of it. But if hidden dangers were overlooked it would be a benefit for the cray. It would be nice if we could find some cray time and try it. ;-)
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