Re: [Bug-gnubg] Threaded rollouts and RNGs

[Philippe Michel]

On Tue, 7 Feb 2017, Michael Petch wrote:

> On 2017-02-07 15:34, Philippe Michel wrote:
>
> > Moreover, the UI is quite fragile since one can set the rng to something
> > not thread-safe like "file" or "random.org". The defaut mersenne rng is
> > ok, though. With it, for a given position and seed, the result is the
> > same for any numbers of threads.
>
> I haven't looked in a long time, but at one time weren't all rollouts
> done via Mersenne independent of what RNG is used for in game dice
> generation?

There are separate RNGs for play and rollouts and the latter is Mersenne 
by default and cannot be changed from the GUI, but there is a "set rollout 
rng" command to do it from the CLI.

I suppose I exaggerated a bit above, you have to try hard to get into 
trouble. But still, file, manual and random.org are not suitable for 
rollouts.