Author: Sune Fischer
Date: 12:48:07 12/04/03
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On December 04, 2003 at 13:47:17, Russell Reagan wrote: >On December 04, 2003 at 07:45:58, Sune Fischer wrote: > >>That huge speedup Sjeng gets, assuming Sjeng isn't largely bitboard based, >>indicates that other factors may be equally important. > >Who knows what he is doing. I keep asking him and he says vague things that make >me think two different things. I can't imagine that he gets a 70% speed increase >while Crafty only gets a 60% boost if Sjeng is not bitboard based. He says, >"Sjeng can take advantage of 64-bit hardware, and, "Crafty is the classic >bitboard program, so what do you think?" That makes me think it's bitboard >based. But then he goes and says something like, "What I think about bitboards >isn't a secret," and what I remember is him arguing about why other approaches >are better than bitboards quite a bit in the past. Dann Corbit also said >something that made me think he saw Sjeng code that was bitboard based at some >point. But who knows. I guess he is just too polite to come right out and tell us it's none of our damn business what he does, I can take a hint however :) But unless he has turned 180 since the old days I doubt he is using bitboards. Of course people have been known to grow smarter over time, so... ;-) >I personally don't get it. He posts benchmark numbers, but doesn't just state >information that is VERY relevant to the interpretation of those numbers. As it >is, we can only guess, and that makes his numbers kind of meaningless. I think it tells us something, that engines in general can look forward to a good speedboost. Exactly what's causing it for Sjeng we don't know, but then again we also don't know exactly what is causing it for Crafty. >Anyway, I am looking into buying one at some point, so I can just write my own >bitboard and array based programs and see how they fair. Yeah, nothing like good old cumbersome tedious testing. -S.
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