Author: Gian-Carlo Pascutto
Date: 13:06:43 11/18/03
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On November 18, 2003 at 15:58:39, Russell Reagan wrote: >On November 18, 2003 at 15:22:51, Gian-Carlo Pascutto wrote: > >>Don't forget the Opteron is WAY faster running old 32 bit code too. You don't >>need 64 bit applications to take advantage of them. > >I don't know about that. I've seen a lot of benchmarks where the Opteron just >edges out the P4 (faster, but not WAY faster). I've also seen some where the P4 >edges out the Opteron, but they are almost always in the same ballpark. > >The specint scores for a 2GHz Opteron and a 2GHz Athlon are not too far off >either. The Opteron scores were about 18-20% faster than the equivalently >clocked Athlon running Crafty, but the Opteron scores for 32-bit code were >compiled with the latest Intel C++ compiler (7 something), while the only >Althon 2GHz scores they have were using Intel C++ 5 something. I suspect if >both used the newer compiler, the difference would be less than 18%, which is >not WAY faster. IIRC for Athlons the Intel compilers are equivalent (They're INTEL compilers after all ;-) >How about Deep Sjeng? You posted your 64-bit numbers. Do you have any numbers >that would compare an equivalently clocked Opteron and 32-bit Athlon both >running 32-bit code? You still haven't told us if Deep Sjeng uses bitboards, >which makes it difficult to extract meaning from your 64-bit numbers. A 70% >speedup for a bitboard program is very nice, but a 70% speedup for a >non-bitboard program would really say something, considering Crafty only gets >about a 60% boost. Considering you know that Crafty is the archetypal bitboard program, and that I haven't exactly kept my opinions about bitboards secret, perhaps the answer to that question isn't _that_ hard to figure out. >That is something I've been very curious about lately, whether a chess program >that doesn't use 64-bit values heavily (0x88, any array based program, etc.) >will get much of a speed boost on the Opteron compared to the fastest 32-bit >processors. Crafty is already faster than a lot of non-bitboard programs on >32-bit hardware. If it gets a 60-70% boost, while others get a 10-20% boost, >that's a significant blow to the non-bitboarders. I'll have more Opteron data 'soon'. But really, the chip is fast 32 bit and BLAZING 64 bit. I don't understand why people still have questions. I don't. And I've noticed Bob and Eugene don't have any more either these days ;) -- GCP
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