[computer-go] Re: Mogo scalability

[Hideki Kato]

Olivier Teytaud: <Pine.LNX.4.63.0805042036370.5736 at acces.lri.fr>:
>> One reason of this discount is that the MoGo bros running on cgos are
>> the _big versions.  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).
>
>The top might overestimate the parallelization, as it depends the results 
>of top depend on how the locks are implemented. I don't know how was this
>part at the time of the release.
>
>With 4 cores, the
>current version of mogo is close to a speed-up four. I believed that the
>released version was quite similar from that point of view.

I recently checked so-called public relase 3 (essentially the same as 
the initial release, right?) as well and its 4 core version shows 
over 330% in top command.  So, I believe the big version doesn't have 
the same parallelism.

Does MoGo use simple mutex or some smarter locks?

I'd like to run newer version on cgos anyway :)

Hideki

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gg at nue.ci.i.u-tokyo.ac.jp (Kato)