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Re: current development

From: Joseph Heled
Subject: Re: current development
Date: Wed, 4 Dec 2019 12:49:02 +1300

I set number of threads to 4

Rolled a cube decision

world-class: 2-ply for move/cube-action  : 18 minutes
expert (0ply) moves/ 2-ply cube actions:  2 minutes.
exper: 0 ply both 0.041

Still seems something is amiss.


On Wed, 4 Dec 2019 at 12:07, Philippe Michel <address@hidden> wrote:
> 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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