Author: Jeremiah Penery
Date: 22:08:28 09/16/04
Go up one level in this thread
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.
Here is some output from a Crafty version I have, hash is 48MB and I let it fill
up completely. I think the calculation you're doing can most closely be
compared to the 'Raw Hits' statistic from this output.
Elapsed Time: 6:30, CPU Time: 6:26, CPU Use: 98%
Nodes: 107445305, Evaluations: 92390424, FH%: 93%, NPS: 275k
EXTENSIONS->
Threat: 5019, Check: 3616775, One Move: 336770
Passed Pawn: 56814, Recapture: 468143
PRUNING-> Futility: 35887143, Razors: 1488083
TABLEBASES-> Probes: 0, Successful: 0
HASHING->
Raw Hits: 10% (1390351/12989242)
Good Hits: 7% (1029362/12989242)
Pawn Hits: 99% (92338241/92390547)
Filled: 99%
EXACT Hits: 0% (85)
LOWER Hits: 4% (637818)
UPPER Hits: 0% (125571)
Earlier in the same search, I had this:
Elapsed Time: 44.08, CPU Time: 42.91, CPU Use: 97%
Nodes: 11726594, Evaluations: 10196696, FH%: 94%, NPS: 266k
EXTENSIONS->
Threat: 24, Check: 370954, One Move: 43349
Passed Pawn: 4626, Recapture: 52992
PRUNING-> Futility: 3983452, Razors: 181121
TABLEBASES-> Probes: 0, Successful: 0
HASHING->
Raw Hits: 23% (312949/1352469)
Good Hits: 13% (184359/1352469)
Pawn Hits: 99% (10184208/10196777)
Filled: 36%
EXACT Hits: 0% (17)
LOWER Hits: 4% (60403)
UPPER Hits: 0% (9945)
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