Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: Question: Hashtable formula

Author: Steven Juchnowski

Date: 20:13:26 04/05/99

Go up one level in this thread



On April 05, 1999 at 20:49:55, Paulo Soares wrote:

>Is the formula below, that is on the Fritz5 manual,
>a generic formula, or either, it can be applied
>to optimize hashtables of any program?
>
>
>		HT(Kb)=2.0*Pfreq(Mgz)*t(S)
>
>	HT= optimized hashtable size in Kb.
>	Pfreq= clock speed of the processor in Mgz.
>	t= average time avaiable per move in seconds.
>
>If this is not a generic formula, exists a specific
>formula for each program?
>
>
>Best regards,
>
>Paulo Soares, from Brazil

The equation is specifically formulated for Fritz5.
Slower searchers such as Hiarcs7 will take more time to
fill the hash table. The constant  in the equation will
need to be reduced for a slow searcher like Hiarcs7.

The equation is probably not terribly accurate as the type of
processor also needs to be considered. For example a
Pentium 200 MMX is faster than a Pentium 200, hence a
larger hash table would be required for the MMX  than what the
equation would predict.

Regards

Steven Juchnowski





This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.