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Subject: Re: The hashtable formula for Hiarcs 7.32

Author: Harald Faber

Date: 02:29:35 06/14/99

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On June 13, 1999 at 14:09:24, Eran wrote:

>Is the formula below correct?
>
>HT[KB] = 0.2 * Pfreq[MHz] * t[s]
>
>HT is the hashtable size in kilobytes, Pfreq is the clock speed of the processor
>in MHz, and t the time available per move in seconds.
>
>Example: Average time per move of 30 minutes (1800 seconds) on a Pentium 200
>will require:
>
>HT = 0.2 * 200 * 1800 = 72000 KB = 72 MB
>
>Or
>
>Example: Tournament games with an average of three minutes (180 seconds) per
>move on a Pentium 200 will require:
>
>HT = 0.2 * 200 * 180 = 7200 KB = 7.2 MB
>
>However, Hiarcs 7.32 does retain information in the hashtable memory even
>between moves.  So it sounds to me that the information is built up until full
>in the hashtable memory while Hiarcs 7.32 is playing thru several moves ahead.
>Is that correct?  Is Hiarcs 7.32 very smart with hashtable memory?
>
>Eran

As written in Computer Schach und Spiele 3/1999 Hiarcs doesn't clear the
hashtables and therefore most possible hash is best.



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