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Subject: Re: Question about hash-tb size for Gambit

Author: Uri Blass

Date: 22:51:36 04/26/01

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On April 27, 2001 at 00:18:14, Robert Raese wrote:

>On April 26, 2001 at 23:52:17, Thomas Scherk wrote:
>
>>>On this computer I would recommend 192Mb hash tables and 32Mb TB cache.
>>>
>>>But please make sure that this setting does not slow the program down
>>>dramatically. It depends on your system, so please try with for example one
>>>middlegame position and one deep endgame position.
>>>
>>>Try with 64Mb HT and 192Mb HT. Set up the program to reach a fixed depth on your
>>>middlegame position. If the NPS is almost the same with 64Mb and 192Mb, then
>>>it's OK to use 192Mb HT.
>>>
>>>Then set the HT to 192Mb (if it is OK), then load the endgame position. Same
>>>experiment at fixed depth, but this time with 1Mb TB cache and 32Mb TB cache.
>>>
>>>But that's a very classical way to test these things, I'm sure you are used to
>>>this procedure already.
>>>
>>>
>>>
>>>    Christophe
>>
>>Dear Christophe,
>>
>>I think Bertil tells us, that the Computer has 256 MB. Depending on the OS, he
>>is using, and depending on the loading of some drivers, maybe Ethernet, Sound,
>>VGA with high resolution and 32 Bits depth Colour, there will be only about 180
>>MB left from these 256 MB.
>>
>>You write "...same with 64 MB and 192 MB...". Is this right? I was told by
>>ChessBase that you can use any amount of hashtables but it must be an amount
>>computed with the formula 3*2^n MB. Is this right?
>
>thomas... i'm not very mathematical...  what is "^n"?

I will explain by some examples because I think that it is more easy to
understand things by seeing examples then by a formal definition:

2^2=2*2=4
2^3=2*2*2=8
2^4=2*2*2*2=16
2^5=2*2*2*2*2=32

Uri



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