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Subject: Expected Hash Hit Rate

Author: Stuart Cracraft

Date: 19:14:36 09/16/04

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

• Re: Expected Hash Hit Rate Jeremiah Penery 22:08:28 09/16/04
• Re: Expected Hash Hit Rate Michael Henderson 19:40:35 09/16/04
  • Re: Expected Hash Hit Rate Scott Gasch 09:54:53 09/17/04
    • Re: Expected Hash Hit Rate Michael Henderson 10:12:54 09/17/04
      • Re: Expected Hash Hit Rate Stuart Cracraft 11:08:39 09/17/04

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