Author: Tom Kerrigan
Date: 22:57:28 03/23/04
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On March 23, 2004 at 17:22:28, Russell Reagan wrote: >On March 23, 2004 at 10:31:33, Anthony Cozzie wrote: > >>Going to 64-bit mode also gives you extra registers. Vincent has posted that >>Diep gets a speedup from 64-bit mode, and he is about as anti-bitboard as anyone >>I know. > >Crafty and Sjeng got boosts of 60% and 70%, respectively. That is 60-70% GHz for >GHz. i.e. 32-bit Athlon XP 2GHz vs. 64-bit Opteron 2GHz. > >What kind of boost did he get? Is it even close to the 60-70% range? The architectures of the Athlon XP and Opteron are very different. You can't attribute a speed increase to being 64-bit. Much better would be to compare the performance of a program compiled for x86 running on an Opteron vs. the same program compiled for AMD64 running on the same Opteron. Even then, you won't be able to distinguish between the benefit of 64 bit computations and the benefit of extra registers, but it's still closer to what you want. -Tom
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