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Re: current development

From: Philippe Michel
Subject: Re: current development
Date: Wed, 4 Dec 2019 00:06:58 +0100
User-agent: Mutt/1.12.2 (2019-09-21)

On Wed, Dec 04, 2019 at 09:46:09AM +1300, Joseph Heled wrote:

> All I know is that I installed gnubg from the repository (GNU
> Backgammon 1.06.002) and the rollouts speed seemed terrible.
> Do I need to do something in the GUI to enable multi-threading? (and I
> hope that by multi-threading we are talking about multi-core, not just
> threading, which does not help)

You may need to change the number of evaluation threads in the 
Settings|Other window. The default is 1.

This is really multi-threading, It is up to you to choose a number of 
threads adapted to your processor. Maybe the number of cores, or that 
number minus 1, or a fraction of that if you intent to run multiple 
rollouts or 4-ply analyses in parallel.

FWIW, I had the opportunity, at a previous job, to try to run gnubg on a 
Knights Landing processor with 256 threads. It didn't run very 
efficiently, maybe 100 times faster that with one thread, but it ran 
without crashes or lock-ups or similar issues.

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