Author: Scott Gasch
Date: 09:54:53 09/17/04
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On September 16, 2004 at 22:40:35, Michael Henderson wrote: >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 I'd say I usually see 30-40+% "matched the signature" and maybe 5%-10% "got a cutoff" on my hash table. I use a 4 probe complicated replacing scheme for storage. I just ran the initial position to depth 10 and got 32.4% matched the sig and only 5.5% got a cutoff for the hash. In a hash-friendly position it can be higher... for example I just ran Fine #70 to depth 30 and got 84.9% matched the sig and 48.1% cutoff rate. Scott
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