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Re: [Bug-gnubg] How many threads can gnubg (reliably) handle?

From: Michael Petch
Subject: Re: [Bug-gnubg] How many threads can gnubg (reliably) handle?
Date: Wed, 09 Sep 2009 14:59:00 -0600
User-agent: Microsoft-Entourage/

I find setting threads to 2 times or 3 times the core cpu count makes a
difference to help the starving issue. Curious if you see any difference. My
choice to up the thread count to 48 was not arbitrary (3 times 16). Can you
let me know if 24 threads on 16 cores does for analysis at 4 ply (and 48).


On 09/09/09 1:39 PM, "Philippe Michel" <address@hidden> wrote:

> On the other hand, analysis doesn't seem to scale well above 8 threads. It
> looks like moves are analysed one by one and after the opening and early
> middle game, even with a large move filter, some, then most of the threads
> are starved. 8 threads was about 7 times faster than 1, but 16 threads was
> merely 9 times faster.

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