Author: Uri Blass
Date: 20:16:19 08/17/03
Go up one level in this thread
On August 17, 2003 at 22:15:53, Robert Hyatt wrote: >On August 17, 2003 at 03:37:22, Johan de Koning wrote: > >>On August 16, 2003 at 05:13:23, Gian-Carlo Pascutto wrote: >> >>>On August 16, 2003 at 03:24:47, Johan de Koning wrote: >>> >>>>>Nondeterminism is something you can live with. Forget about getting >>>>>the engine working on multiprocessor if you don't. >>>> >>>>So far you sound like someone trying to mimic Vincent. :-) >>> >>>But you sound like someone who avoided my point :) >>> >>>At some point you must choose between determinism and performance. >>>I don't want to go to lengths to keep the engine deterministic only >>>to find out later it can't be maintained AND I've lost time and >>>speed trying to put off the inevitable. >> >>I'm not avoiding your point, I'm simply denying it. :-) >> >>There isn't such a thing as the point of no determinism, there are many points >>at which choices can be made. If performance gain is small (playing games) I >>will prefer determinism and simplicity. If gain is large (interactive analysis) >>I will prefer determinism and perfection. In case determinism is impossible >>(deep) I will prefer to maintain determinism for all other cases. >> >>>Hence the Santa Claus reference. You can stubbornly keep believing, >>>but one day, he'll stop bringing presents. Or maybe it was just me who >>>was a bad boy. >> >>If you quit being a bad boy Santa will return. :-) >> >>... Johan > > >If you ever do a parallel search, forget about determinism. If you don't, >forget about winning games. :) one cpu has chances not only to win games but also to win tournaments. A lot of programs won tournaments inspite of having only one cpu. The king did it in the dutch championship when more than one cpu of some opponents did not help them Same for Shredder in the past when Ferret,Junior,Fritz had more than one cpu. When computers become faster I expect the advantage of 2 cpus against 1 cpu to be less important and things like better order of moves may be more important. It is also possible to be deterministic with more than one cpu. You may lose some speed relative to being not deterministic but still do significantly better than one cpu. Uri
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