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Subject: What's the use of increasing hash?

Author: Gabor Szots

Date: 22:34:22 03/30/00


Once I made experiments on how hash table size affects playing strength. I used
BS-2830 test and LG2000 (I don't remember the version) for the purpose. On a
Pentium 166 MMX I found that increasing hash table size from 4 MB to 8 and then
to 16 increases Elo rating by 10 and 15, respectively. Increasing it to 32
probably would not have had any measurable effect at all.
I know it also depends on how fast the machine is, what program is used, what
time control is etc. but there must be some guidelines as to how much extent it
is worth increasing hash at the cost of reducing memory size for other programs.
By the way, can someone tell how playing strength is affected if I for example
play flipper in the background (single processor machine)?

Your comments would be appreciated.

Gabor



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