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Subject: Re: Any Chessprogram that can use really big hashes + a theoretical Q ??

Author: Robert Hyatt

Date: 18:07:25 12/02/01

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On December 02, 2001 at 18:13:59, Kim Roper Jensen wrote:

>Hi
>
>I just wondered if there was any chessprograms that could use really big
>hashtables, i got 2gigs of ram and i dont know any program that can use this
>amount. The highest that I know of is Chessbase progs with approx 818Megs or
>something close.

The largest I have ever tried was 24 gigs on a Cray T90.  Crafty has no
limit that I know of, other than what the operating system will allow.



>
>If I understand it correctly there shouldnt be any real strength improvement
>when I use really big hashtables, but is the strength improvement approximating
>some limit, for hashtable-size inreasing towards infinity ??

Yes.  Once the table is large enough to store everything you want to store,
making it bigger won't help any further.



>
>i will try here to draw with chars what i mean:
>
>elo
>xxx| - - - - - - - - - - - - - - -
>   |             x   xxxxxx
>100|        x
>   |     x
> 50|   x
>   | x
> 10|x
>   +------------------------------- tablesize in megs, kbytes ....... whatever
>     10  100  1000 10000 100000  +oo
>
>Please dont comment my artful chart :)
>
>With Regards
>Kim



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