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Subject: Re: hash table size - is a power of 2 still an advantage these days?

Author: Robert Hyatt

Date: 08:28:55 09/25/03

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On September 25, 2003 at 09:48:33, Tord Romstad wrote:

>On September 24, 2003 at 16:28:57, Robert Hyatt wrote:
>
>>I try to use _most_ of main memory for serious games, and if you have a
>>1 gig machine, I generally use something like hash=784M, hashp=40M,
>>cache=128M, and go from there...
>
>Interesting.  Is a 40M pawn hash table really useful for Crafty?  How big
>are your pawn hash entries?  My pawn hash table contains just 256 entries,
>where each entry is 128 bytes.  The last time I tried, increasing the size
>of the table gave just a very small speedup (less than 2%, if I recall
>correctly).
>
>Tord


I've never carefully tested this, but 256 entries seems _way_ small.  Just
look at how many different possible pawn positions there are.  40M might be
too big, but the memory is wasted otherwise and bigger is never worse, for
me.

• Re: hash table size - is a power of 2 still an advantage these days? Francesco Di Tolla 07:42:12 09/26/03
  • Re: hash table size - is a power of 2 still an advantage these days? Robert Hyatt 19:03:45 09/27/03
• Re: hash table size - is a power of 2 still an advantage these days? Tord Romstad 10:02:22 09/25/03
  • Re: hash table size - is a power of 2 still an advantage these days? Ricardo Gibert 04:01:49 09/26/03
    • Re: hash table size - is a power of 2 still an advantage these days? Tord Romstad 07:15:44 09/26/03
    • Re: hash table size - is a power of 2 still an advantage these days? Gerd Isenberg 06:49:49 09/26/03
      • Re: hash table size - is a power of 2 still an advantage these days? Uri Blass 08:59:10 09/26/03
  • Re: hash table size - is a power of 2 still an advantage these days? Tony Werten 22:03:33 09/25/03
    • Re: hash table size - is a power of 2 still an advantage these days? Uri Blass 01:41:33 09/26/03

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