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Subject: Is the optimum hash size chess program dependent?

Author: Rupesh

Date: 20:36:06 04/15/03


Dear All,

I have noticed that there does not exist a universal optimum hash table size for
the optimum performance for every program. The size seems to depend on the
program that one is using. (context: number of 3+2 marches/ played on playchess
with a xeon 2.60 GHZ dual and 2 Gig DDR)

For example, i see that the performance of shredder improves when i use 32/64 MB
in comparison to 256 MB. Whereas i see that if i raise the hash size to 512 MB/
1024 MB for deep fritz, the performance improves significantly. Surprisingly,
raising the hash does not seem to lose on time ( although the speed of search
definitely slows down) as the program seems to play from hash!!

Can somebody comment as to whethee such a thing as universal optimum hash size
is a subject of trial and error or is it  really some scientific calculation
which is suggested in T-notes of chessbase.

Any thoughts will be much appreciated.

Amitesh



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