[computer-go] Strong programs on cgos 19x19?

2010-02-16 Thread David Fotland 
My old MPI code had a scaling bug.  Performance scaling (playouts per
second) was linear, but the strength did not scale well, and 64 cores was
weaker than 32 cores.  I have a 16 core cluster of my own now (four 2.3 GHz
Q8200 quad core), and I discovered that the MPI code hangs when using MPICH2
rather than the Microsoft MPI library.  So last week I rewrote it with a
different algorithm, and it seems to scale much better.

It's on CGOS now, for at least a few days.  It would be great if some other
strong programs could join, zen, or fuego-8c, or aya-4c, or the strong
version or pachi.

Thanks,

David


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[computer-go] [ANNOUNCE] Pachi 5.00 Dosaku

2010-02-16 Thread Petr Baudis 
  Hi!

  I'd just like to let you know I have tagged version 5.00 of the Pachi
Go playing program (codename Dosaku). I certainly don't want to spam
the mailing list with announcement of each next release, but I figured
some people might be interested this time, since Pachi's 19x19 strength
with default settings seems to finally be on par with Fuego; Pachi
still might be couple ELO points weaker, but the performance (within
the same time limits) is certainly becoming very comparable at least
according to my testing.  The recent improvements are mainly thanks to
tuning help and timekeeping code kindly contributed by Jean-Loup Gailly!

  Pachi is a simple, open source, Go-specific, modular program
reimplementing published UCT MCTS methods mostly the Mogo way (Mogo-like
playout rules, UCT priors and RAVE exploration), plus of course trying
various small original research ideas. (CrazyStone-like playouts are
being developed intensively, but disabled by default for now since buggy
and unoptimized yet.) Pachi scales well up to many cores, has very
flexible time management support and can take full advantage of available
KGS bot features. Only playing with very long thinking times is currently
not tested very well and might not work best out of the box.

  You can get the latestPachi sources at http://repo.or.cz/w/pachi.git,
5.00 source tarball for UNIX/GNU systems is at:


http://repo.or.cz/w/pachi.git/snapshot/9de4aaf662aecb27cadd527b8e9d651a95c49a19.tar.gz

Pre-compiled binaries and packages are currently not available, perhaps
someone will create some.

  Kind regards,

-- 
Petr Pasky Baudis
A great many people think they are thinking when they are merely
rearranging their prejudices. -- William James
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