Author: Vincent Diepeveen
Date: 15:06:27 06/29/04
Go up one level in this thread
On June 29, 2004 at 17:57:07, Djordje Vidanovic wrote: >On June 29, 2004 at 15:50:00, Vincent Diepeveen wrote: > >>On June 29, 2004 at 12:48:06, Robert Hyatt wrote: >> >>>On June 29, 2004 at 12:28:03, Vincent Diepeveen wrote: >>> >>>>On June 29, 2004 at 11:56:05, Robert Hyatt wrote: >>>> >>>>>On June 29, 2004 at 11:25:08, Jaime Benito de Valle Ruiz wrote: >>>>> >>>>>>On June 29, 2004 at 08:26:15, Zach Wegner wrote: >>>>>> >>>>>>>One important point is that crafty uses bitboards, so it will have an additional >>>>>>>speedup on a 64 bit processor. >>>>>> >>>>>>I might be wrong, but I think that Fritz also uses bitboards (I don't know about >>>>>>Shredder). >>>>>>Anyway, what about the compiler? And what extra efficiency do you expect from a >>>>>>64-bit processor? Enough to outsearch all other engines running on similar >>>>>>processors? >>>>>> >>>>>>Jaime >>>>> >>>>> >>>>>AMD has tested Crafty to answer this question. They compiled it for 32 bits, >>>>>and for 64 bits. The 64 bit version runs 47% faster than the 32 bit version, >>>>>everything else remaining constant. >>>> >>>>Going from 32 to 64 bits also the number of registers moves up from 8 to 16 >>>>which is a big speedup also for Crafty and is inside that 47%. >>> >>> >>>Does not change their statement or measurement... >>> >>>And the question will be whether or not the commercial guys use a beta compiler >>>to produce accesses to those extra registers. If, as you always claim, fritz is >>>in ASM (rather than what Frans claims, that it was rewritten into pure C a >>>couple of years back) then it won't be able to touch those registers either... >> >>Fritz will be opteron assembly, read my lips... >> >>Please show me a statement from Frans where he quotes it is written entirely in >>C. I cannot remember that at all. They (reporters) just ask whether 'fritz' is >>written in C. The answer is probably 'yes' to that (interface). >> >>>Time will tell... >>>>>Fritz does not use bitboards by the way... > > > >Fritz will hit 25 million kn/s, reaching ply 17-18 in the middlegame... :-) And >it will be Opteron ASM, by the way :-) I'm not so sure about speed. Commercially they will say it's C++ when that is in their interest to say, they will say it's C when that's in their interest and it will be assembly when it is in their interest to say so. But the *engine* is in assembly, let's be clear there. I would expect about 15 million nps, except that last years Frans has put more knowledge into evaluation. I remember he said already around 1999 he had an evaluation exactly 2 times bigger than crafty, so i guess that'll be at least 4 times bigger by now. That will slow it down. Also it's doing seemingly checks in qsearch which slows it down. I expect somewhere around 9-10 million nps or so. That's about 1000 cycles a node.
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