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Re: [Bug-gnubg] More on use of noise in rollouts

From: Jim Segrave
Subject: Re: [Bug-gnubg] More on use of noise in rollouts
Date: Wed, 10 Jun 2009 10:45:47 +0200
User-agent: Mutt/1.5.16 (2007-06-09)

On Tue 10 Feb 2009 (10:01 +0100), Christian Anthon wrote:
> Hi Bob,
> I wont have time to look into it any time soon, so here is just a
> couple of suggestions.
> a) truncation of the rollouts may help you track down what is going on
> b) turn on rollout logs by issuing the commands
> set rollout log on
> set rollout logfile bob_is_an_intermediate_player
> which will give you a .sgf file for each trial.
> Combining a) and b) should give you a good idea about what is going on.

I haven't checked, but the rollout logs (which I put in to debug the
changes to rollouts I was making) were completely non-thread
safe. There was a single file handle to which all moves were being
output. I tried using it once a few months ago and the results were

If the file handle, file names etc. have been moved into a
thread-local data structure then it will work again (modulo sufficient testing)

Jim Segrave           address@hidden

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