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Re: For Mac OS X users [Was Re: [Bug-gnubg] gnubg on mac os x]

From: Olivier Baur
Subject: Re: For Mac OS X users [Was Re: [Bug-gnubg] gnubg on mac os x]
Date: Wed, 9 Apr 2003 15:32:45 +0200

Le mercredi, 9 avr 2003, à 10:09 Europe/Paris, Øystein O Johansen a écrit :

How is the speed? How many static evaluations can you get each sec?
(Analyse->Evaluation Speed->Calibrate)
I get about 17000 on my 2 GHz Intel XEON, and about 23000 on my 2.53 GHz P4


On my PowerBook G4 768 MHz (no L3 cache :-)), I get about 9000 static evals/sec. Quite poor compared to the numbers you give. I'm waiting for someone to test it on a desktop G4 :-)

But I know I can get an increase to about 11000-12000 evals/sec by "tweaking" some code (actually rewriting the eval algorithm to superscalar with the G4's Velocity Engine) -- this was a quick try, not released for now. My G4 code perf analyser also tells me there are many things to correct about float usage in the eval, sigmoid and calculateinputs functions -- things that dramatically matter on G4 performance.


Olivier Baur

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