Author: Paul Petersson
Date: 20:00:03 12/05/99
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On December 05, 1999 at 09:51:42, Robert Hyatt wrote: >On December 05, 1999 at 03:54:32, O. Veli wrote: > >> I would like to learn how much difference a dual-processor would make for a >>chess program? Say a dual 500 Celeron and a dual PIII 450's. I assume it would >>not mean a lot for much of the programs except for the Crafty and the upcoming >>Deep Junior. How much difference could one except for these programs in Elo? >>Thanks for your time. > >I would estimate the typical performance improvement (two cpus) at 1.6-1.75 >times faster (regardless of estimates you might see that suggest better >numbers). That is probably about 50 rating points better, since many quote the >70 points per doubling of cpu speed... > I´ve heard that ChessBase claims a speedup of 1.8 for Deep Junior, and that Deep Junior is 5 percent slower than J6 on one cpu. Paul >I have no idea what kind of speedup Junior gets. I have lots of good data for >Crafty, that is in the speed-up range given above. Cray Blitz did better, but >the algorithm was _much_ harder to write and debug, and using a recursive >alpha/beta search I don't see any easy way to implement the DTS algorithm I >used. > >Note that there are a few pathological positions that will tear up any parallel >search. IE it is possible to run _slower_ with 2 cpus than with only one, on >some odd positions. It is possible to run 10X _slower_ in such cases... Which >is a headache...
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