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[Bug-gnubg] Re: Getting gnubg to use all available cores

From: Louis Zulli
Subject: [Bug-gnubg] Re: Getting gnubg to use all available cores
Date: Thu, 6 Aug 2009 09:21:06 -0400

On Aug 5, 2009, at 4:02 PM, Michael Petch wrote:

I'm unsure how the architecture is deployed and how OS/X handles the
physical cores, but it almost sounds like one Physical core is being used (Using Hyperthreads to run 2 threads simultaneously). I wonder if the memory is shared across all the cores? A friend of mine was suggesting that people may have to wait for Snow Lapard to come out before OS/X properly utilizes
the Nehalem architecture (whetehr that si true or not, I don't know).

Anyway, as an experiment. If you run 2 copies of Gnubg at the same time
(using multiple threads) do you get 400% CPU usage?

Hi Mike,

Sorry for the delay. I just had two copies of gnubg analyze the same game, using 3 ply analysis. Each instance of gnubg used 200% CPU. Each copy was set to use 4 evaluation threads.

So what's the verdict here? Is Leopard simply not directing threads correctly?


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