[Pachi] Run Pachi on AWS

Kevin Zhou kvzrock at gmail.com
Mon Jun 17 05:13:36 CEST 2013


How do I launch multi threaded slaves? I didn't find the command in the
README. Also, is 7G RAM too little for 8 threads?

Thanks!

Kevin
On Jun 16, 2013 8:20 PM, "Petr Baudis" <pasky at ucw.cz> wrote:

>   Hi!
>
> On Sun, Jun 16, 2013 at 08:00:23PM -0500, Kevin Zhou wrote:
> > Here's my config file for kgsGTP:
> >
> > mode=custom
> > room=Computer Go
> > name=scengine
> > password=***
> > rules.time=5:00+5x0:15
> > reconnect=t
> > engine=/home/ubuntu/pachi/pachi -e distributed slave_port=1234
> >
> > My cluster has three nodes (c1.xlarge instance), each node. has 8 cores.
> By
> > running kgsGTP + pachi master + 8 pachi slaves on Node1, 8 pachi slaves
> on
> > each of the other nodes, I have 24 slaves running. And my winrate message
> > look like this:
>
>   I see, so you are running a separate slave for each thread, not
> multi-threaded slaves.
>
> > scengine: In 22714 playouts at 24 threads, black B16 can win with 70.9%
> > probability.
> >
> > scengine: In 256528 playouts at threads, black F15 can win with 69.8%
> > probability.
> >
> > usually, the playout numbers are below 100K.
> >
> > Is this typical for this configuration?
>
>   I'm sorry, I have no idea how will Pachi behave in this configuration.
> It's not clear how long did Pachi take; consider using only byoyomi and
> no base time to have a fixed per-move time allocation. Then see what
> happens when you use (i) just a single Pachi instance with 8 threads
> (no distributed mode), (ii) three 8-threaded slaves, (iii) this
> configuration. We will be glad if you report back with your results. :)
>
> > Can I change the max number of simulated games played on all slaves
> > (default is 80K?)
>
>   Hmm, I'm not sure what "max number" are you referring to?
>
>   Best,
>
> --
>                                 Petr "Pasky" Baudis
>         For every complex problem there is an answer that is clear,
>         simple, and wrong.  -- H. L. Mencken
>
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