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

Author: Christophe Theron

Date: 00:13:31 04/27/01

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On April 27, 2001 at 00:22:43, Robert Raese wrote:

>On April 26, 2001 at 21:43:23, Christophe Theron wrote:
>
>>On April 26, 2001 at 20:38:18, Robert Raese wrote:
>>
>>>On April 26, 2001 at 20:36:25, Robert Raese wrote:
>>>
>>>>On April 26, 2001 at 20:15:47, Dan Andersson wrote:
>>>>
>>>>>That should be an easy one to answer, 192MB is maximum for Tiger and 16MB TBs
>>>>>are recommended. And thats way under 256 MB.
>>>>
>>>>i'd be interested to know how the figure 16MB was arrived at... if that is the
>>>>optimal setting for all time controls, or just for long games.  i don't really
>>>>know the mechanism of how TBs are used by the program, so i'm wondering if
>>>>adding more RAM could help or even possibly hurt performance?
>>>
>>>* i meant adding more RAM to the TB cache.
>>
>>
>>
>>Well... My computer has only 96Mb RAM, so I cannot experiment up to 256Mb...
>>
>>But I think that adding TB cache will only increase performances, until you
>>reach a point where the OS has to swap data back to disk because your are using
>>more than the available RAM.
>
>how does the concept of "persistent hash" relate to this?  also, if hash is
>persistent, does it persist between games, or just for the duration of the game?
>
>>
>>    Christophe



Persistent hash only relates to the main hash table, not the TB cache.

In Tiger, the hash table is only cleared between games, never during a game.



    Christophe



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