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Re: [Bug-gnubg] Bug: Race theory, dice seed

From: Holger
Subject: Re: [Bug-gnubg] Bug: Race theory, dice seed
Date: Wed, 01 Oct 2003 17:19:05 +0200

At 13:39 01.10.2003, Jim Segrave wrote:
On Wed 01 Oct 2003 (08:28 +0100), Jon Kinsey wrote:
> At 07:39 01/10/2003, Joern Thyssen wrote:
> >On Tue, Sep 30, 2003 at 08:50:49PM +0200, Holger wrote
> > > Would it be possible to use a second instance of the RNG for other things
> > > then play so they don't disturb each other? (I mean, does the RNG code
> > > support this?)
> >
> >gnubg supports a number of RNGs. I guess some of them support multiple
> >instances, but others don't (e.g., BSD, ansi, and others).
> It should be quite easy to add another Mersenne Twister RNG, which could be
> used in all the non-playing areas.
> If that is the only RNG the roll-out/theory code needs.

It is quite strraightforward to have multiple copies of the initernal
state of the MT RNG. I would suggest that rather than add the
complexity of saving/restoring state on all paths through every code
block which uses the MT RNG, that we arrange that the various callers -
play, theory, and rollout are indicated so that the RNG can choose
which static structure it uses. This could be done by adding an
argument in all the appropriate places where the RNG is

Does the RNG have to be static? Well, for play it could just be left how it is right now. All other functions could instantiate their own, e.g. on a start of a rollout. Or would this be too much overhead?

Looking at the other RNGs, most could be modified to support multiple
parallel sequences, but the question is whether it's worth

I was assuming we'd only use MT for everything else then play.

doing. Saying that the training, rollout and osr functions will only
use Mersenne Twister, while leaving the play rng fully selectable
seems to me not to be any real loss of functionality.

I agree.



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