Author: Roberto Nerici
Date: 07:08:53 12/23/03
Go up one level in this thread
On December 23, 2003 at 09:03:45, Anthony Cozzie wrote: >On December 23, 2003 at 06:39:22, Peter Berger wrote: > >>On December 22, 2003 at 22:59:01, Robert Hyatt wrote: >> >>>>To go back to the discussion that started this: it looks as if Crafty on 10 >>>>times faster hardware is indeed very competitive with a top commercial engine, >>>>but not necessarily the overwhelming favourite. >>> >>>That was my original point in response to Omid's rather crass "if they >>>thought they had any chance of winning, they would have come..." statement. >>> >>>And the main point is that I probably would not have been "just" 10X >>>faster. :) >>> >> >>Interesting. I think this was not challenged in discussion partly because there >>was no clear idea how much faster Crafty would have to be. >> >>Let's say you had planned to show up with 10X faster hardware with Crafty at >>WCCC2003. >> >>This is what Junior used there: >>http://www.chess.at/turniere/turniere2003/chess003/video/int2.wmv >> >>Intel 4* 2.8 GHz >> >>What would you have got for Crafty? >> >>Peter > >It would probably not be too hard to get a 64-way Itanium2 box. I know Vincent >was "practicing" on one of those :) I think that'd be about 60M nps for crafty. > I'm not sure how much stronger it would be, though. I think evaluation is much >more important than search depth once you start hitting 14-15 ply. > >anthony I doubt it. Bob has had to put a lot of work into getting really good scaling for a 4-way Opteron (he's been very successful, however). Last time he posted about this, he was getting nearly 7Mnps on Windows and ~6Mnps on Linux. I don't know what you would get if you just stuck the current version on a 64-way machine, but I doubt it would be anything near 60M. (Actually, someone did post to the Crafty mailing list some results they'd got from running an earlier 19.x version of Crafty on some _really_ big machines. I don't have the post to quote from, but they ran the benchmark on a different number of processors and found the total nps was less on 8 processors than on a lower number.) So could Crafty ever get 10 times the nps than Junior on a quad Pentium? I can't see how, as things currently stand. Roberto/.
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