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Re: [gnugo-devel] multi-board branch

From: Arend Bayer
Subject: Re: [gnugo-devel] multi-board branch
Date: Sun, 24 Apr 2005 23:24:19 +0200 (CEST)

> I wrote:
> > Arend wrote:
> > > The obvious question: How big is the performance penalty?
> > > That's of course we need to take into account when discussing
> > > whether we want this in mainline.
> >
> > I don't know, because I cannot run "real" tests yet: they depend on all
> > the GNU Go at once and I still haven't converted owl and `value_moves.c'.
> > I don't expect the performance hit to be over 3% though.
> Unfortunately, I was wrong.  Performance hit is around 10%: 6885 seconds
> CPU time against 6106 seconds.  Timing may be not very precise as I used
> the box during regression runs, but the main picture is clear.

Which CPU, compiler? I may try to run some tests myself.

> In addition, there is some subtle bug that causes node counters differences
> on some test files.  I was unable to track it down.
> So, the question is: should I abandon this project?  I myself is uncertain.
> 10% or even more seems like somewhat too high a price.

You should definitely put the work you have already done on the branch.
If it is really 10%, it feels like a bit too much to me. Maybe forking
would actually be a better idea?


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