Author: Michael Henderson
Date: 19:40:35 09/16/04
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On September 16, 2004 at 22:14:36, Stuart Cracraft wrote: >I have two variables "ttprobes" and "ttmatches". > >When I attempt a hash table probe, I always >ttprobes++. > >In the probe routine, if I get a match on the 64-bit >hash key, I do ttmatches++. > >My question is, for a tier-1 replace always table in >a standard null move R=2 searcher with material-only/pc-sq-only >evaluation, what kind of hit rate percentage should I expect with the >following calculation > > ttmatches*100/ttprobes > >Is there some other hash-table-related statistic calculation I >should be doing to see whether the hash table is contributing >its fair share to the search. > >Thanks, > >Stuart Usually it's around 20-30% in standard time control searches. 15-20% for hash cutoffs. I'm not sure about hash matching in 1 second searches but I would think it's relatively high because there is not much overwriting. Michael
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