[computer-go] Re: Mogo scalability

[Mark Boon]

On 4-mei-08, at 14:57, Hideki Kato wrote:

>  By my obserbation (they are running on my pcs and
> both are Q6600/3GHz with different mother boards), mogo_big_4core's
> perallelism is around 300% (by top command), perhaps due to its
> heavier uct part (just my guess).

Of course the CPU load doesn't really say how effective  
parallelization is. Recently I bought an octo-core Mac and have been  
running some tests. It takes time to get real conclusive data but I  
have some observations that come purely from some testing and  
watching. When using eight cores I get a speed-up of around six  
times. That is in number of playouts per second. I think that's a  
much more useful metric than looking at the CPU load.

Still, even number of playouts is not the end-all I believe. I have  
the distinct impression that eight cores running for one second plays  
considerably worse than one core running for six seconds, even though  
the number of playouts is in the same ball-park. I haven't had the  
time to do an extensive test on that yet but I'm convinced that the  
picture is more complicated than just looking at total computing power.

Mark


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