Author: Pat King
Date: 07:39:09 02/09/01
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On February 07, 2001 at 10:59:31, Pat King wrote: >I have seen it written here that with 64 bit Zobrist hashing, the perfect key >should change 32 bits. When I had what I thought to be hashing problems, I >captured some stats on my hash keys. I found that most of them changed 28-36 >bits (within 4) with a few outliers as far as 13 bits from "perfection". I also >checked that I was not generating duplicate keys. How good or bad is this? >Should I work on the average, or the outliers? Any comments appreciated :) > >Pat Thanks to all for your thoughtful replies. For what it's worth, the only change I've made is to generate a key set with hamming distance 31-33, with a significant improvement in hash performance (thanks to Ricardo for providing a reasonable argument to justify the 32 bit standard). I have yet to compare this set with Rob's 16 bit criteria for XORing any 2 keys. Pat
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