Author: Larry Griffiths
Date: 23:42:10 09/16/00
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On September 16, 2000 at 17:04:23, Dan Newman wrote: > >I once tried to measure the error rate and got no errors at all with 64-bit >hashcodes over several hours of testing. I was able to measure the error rate >for 32-bit hashcodes--that was about 1 false match/second (at perhaps 100k >probes/s). I think someone came up with an estimate of (very approximantely) >one error/day with a 64-bit hashcode at 100 knps--or was it 1 Mnps? Anyway, >the error rate is very low and can mostly be ignored. I do try to make sure >that such an error won't crash my program though... > >-Dan. I dont know what is happening but I ran 78 positions from BWTC suite and got over 10,000 mis-matches using my 64-bit hash keys. I looked at my smallboards and they usually differ by a piece missing or in a different position. My Piece table does not have zero or duplicate entries and the random numbers in the piece table look good. I built hashkeys using the two different smallboards and they do indeed generate the same hashkeys. Maybe my hashkeys should be prime numbers? Larry.
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