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

[Louis Zulli]

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?

Louis