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Subject: Re: Rybka bugs comment

Author: David Dahlem

Date: 15:25:43 12/08/05

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On December 08, 2005 at 17:35:32, Günther Simon wrote:

>On December 08, 2005 at 17:06:53, David Dahlem wrote:
>
>>On December 08, 2005 at 13:42:51, Günther Simon wrote:
>>
>>>On December 08, 2005 at 08:53:55, David Dahlem wrote:
>>>
>>>>Will there be additional UCI options other than "Search Direction"? And will
>>>>there be a way to adjust hash size?
>>>>
>>>>Thanks
>>>>Dave
>>>>
>>>
>>>Hi Dave,
>>>
>>>It is easy to get all UCI options by just starting any UCI.exe
>>>and typing in 'uci'. (of course you would get them also from
>>>looking into the logs)
>>>
>>>Below you see all supported UCI commands:
>>>(If you don't have an UCI hash command there is either
>>>a bug in the used GUI or you did something wrong)
>>>
>>>uci
>>>id name Rybka 1.0 Beta 32-bit
>>>id author Vasik Rajlich
>>>option name Hash type spin min 2 max 4096 default 32
>>>option name Search Direction type combo default Very Positional var Very
>>>Positional var Slightly Pos
>>>itional var Slightly Tactical var Very Tactical
>>>uciok
>>>
>>>Regards,
>>>Guenther
>>
>>Hi Guenther
>>
>>Not too sure i understand, i'm fairly dumb about uci. Are you saying that i
>>should see a hash command option for Rybka in it's configuration window in
>>Arena? I only see a "Search Direction" option. If this is not the case, how do i
>>change the default hash setting for Rybka?
>>
>>Regards
>>Dave
>
>In this case I direct you back to Franz' answer :)
>He explained that you will _never_ see engine specific uci hash settings
>for _any_ UCI engine, _if_ you have set a general hash setting for all
>in Arena. This is a design decision of Arenas' author.
>BTW a lot of programs don't use exactly the hash you set up for them
>(internal stuff which is hidden might use some extra hash). I agree
>though that this normally doesn't happen for UCI programs and if, not
>by that margin you described in another post.
>Well I see that Rybka seems to use 16-17MB extra hash always, but
>that is at least no big problem for me, because I allow I safety
>margin up to 160MB including Nalimov cache and special hash tables,
>like pawn or eval hash.
>If you really have to care about that hash, either because you
>don't have enough phsyical ram, or because of justice reasons,
>you need to set all hash options manually and uncheck the general
>hash size in Arena. With 16MB setting for Rybka it should fit
>to your 32MB standard.
>
>Regards,
>Guenther

Yes, i understand all that. But giving 16mb to Rybka wouldn't be fair if other
engines are using 32mb, unless i change all others to 16mb. (big sigh) :-)

Regards
Dave



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