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

Author: Pham Minh Tri

Date: 04:25:04 12/03/01

Go up one level in this thread


On December 02, 2001 at 21:07:25, Robert Hyatt wrote:

>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.
>

Should someone think about diffirent ways of using big memory for next 5 years,
say load all EGTBs into memory? :)

>
>
>>
>>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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