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Subject: Re: hash table size - is a power of 2 still an advantage these days?

Author: Sune Fischer

Date: 15:00:09 09/24/03

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On September 24, 2003 at 17:37:06, Uri Blass wrote:

>>Of course it matters most when doing long analysis, not very important for blitz
>>games.
>
>How much it matters?

Every tiny bit matters.

>I read claims in the past that doubling the hash only gives 6-7% speed
>improvement and if you lose 1-2% from division then it may be important.

Yes it is in that ball park probably.

I don't think it's constant though, those 6-7% could be less in very fast bullet
games and more in long over-night analysis sessions.

>The only way to know is testing and from my experience 1-2% speed reduction
>because of division is possible.

It's crazy that they take so long.

>I also know from experience that when I use big hash tables the program may be
>very slow in the first minutes so I prefer not using more than half of the RAM
>of the machine for hash tables for long analysis.
>
>I want to be able to do other things during analysis without having big
>problems.

Ok, so designed to conserve resourses? ;)

-S.
>Uri



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