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Subject: Re: Formula for hash table size

Author: Peter Fendrich

Date: 06:33:44 08/28/03

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On August 28, 2003 at 09:22:40, Miho King wrote:

>On August 28, 2003 at 07:39:00, Buchmann Patrick wrote:
>
>>On August 28, 2003 at 05:10:10, Peter Fendrich wrote:
>>
>>>IIRC Chessbase/Fritz published a formula for minimum required hash table size in
>>>order to get optimal performance.
>>>
>>>Does anyone know where I can find it and/or other similar formulas for other
>>>engines?
>>>
>>>/Peter
>>
>>Hi Peter,
>>
>>This formula was published in a T-Note by Steve Lopez.
>>
>>You can find the article here:
>>http://www.chessbase.com/support/support.asp?pid=199
>>
>>Regards,
>>Patrick
>
>
>According to that formula i should set hashtable size to
>2*3300*(60*60)/1024=23203,125 MB
>for one hour analyse.
>I am running to my local store for some 16GB RAM modules ;-)

That's a general problem for all chess engines I believe.
After some time the hash table will be filled and useful entries are
overwritten. The performance will drop and the medicine is more hash table size.
There will always be a time limit where the hash table size exceeds your budget
or the technical limitations!
/Peter




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