[Computer-go] Strange GNU Go ladder behavior

Peter Drake drake at lclark.edu
Thu Jun 18 19:49:21 PDT 2015


I haven't been able to reproduce it in isolation yet (including by
replaying from an SGF), but when I run several hundred games, this
consistently happens in several of them.

On Thu, Jun 18, 2015 at 3:57 PM, René van de Veerdonk <
rene.vandeveerdonk at gmail.com> wrote:

> Can you reproduce it issuing gtp commands, i.e., loading in the failing
> position from sgf-file and requesting gnugo to generate a move?
>
> Example:
>   loadsgf games/strategy25.sgf 61
>   gg_genmove black
>
>
> On Thu, Jun 18, 2015 at 3:56 PM, Petr Baudis <pasky at ucw.cz> wrote:
>
>>   Hi!
>>
>>   I've observed the same thing when playtesting Pachi against GNUGo,
>> since very long ago.  If you look a few moves back, you will see GNUGo
>> already taking progressively longer time as the ladder is played out.
>> IMHO there's some crazy exptime backtrack that gets out of hand at some
>> point.  It'd be interesting to see if giving GNUGo some time limit
>> helps.
>>
>> On Thu, Jun 18, 2015 at 03:45:18PM -0700, Peter Drake wrote:
>> > Nope, we're still getting these crashes with more memory in the system.
>> It
>> > still looks like it's always GNU Go that's crashing, and it always
>> happens
>> > some way into a ladder that Orego shouldn't really be playing out.
>> >
>> > On Thu, Jun 18, 2015 at 3:24 PM, Peter Drake <drake at lclark.edu> wrote:
>> >
>> > > I have no idea what GNU Go does for memory management, but that does
>> offer
>> > > up a possibility: maybe the machine in question (a Google Compute
>> Engine
>> > > instance) is running out of memory. I've been using the highcpu
>> machine
>> > > types; I'll try a standard one (which has more memory) and see if the
>> same
>> > > thing happens.
>> > >
>> > >
>> > > On Thu, Jun 18, 2015 at 1:41 PM, uurtamo . <uurtamo at gmail.com> wrote:
>> > >
>> > >> What does it do for memory management? Is it ungracefully failing
>> while
>> > >> evaluating the ladder itself due to ram issues?
>> > >>
>> > >> steve
>> > >> On Jun 18, 2015 12:15 PM, "Peter Drake" <drake at lclark.edu> wrote:
>> > >>
>> > >>> This list may not be able to help, but I'm running out of clues on
>> this
>> > >>> one.
>> > >>>
>> > >>> I'm trying to run an experiment playing Orego against GNU Go in many
>> > >>> games. Some of the games don't end properly. As far as I can tell,
>> here's
>> > >>> what happens:
>> > >>>
>> > >>> 1) Orego plays out a losing ladder. (That needs to be fixed, but
>> that's
>> > >>> another problem.)
>> > >>> 2) At some point in the ladder, GNU Go quietly dies without
>> responding
>> > >>> to the move request.
>> > >>>
>> > >>> Has anyone else encountered this?
>> > >>>
>> > >>> --
>> > >>> Peter Drake
>> > >>> https://sites.google.com/a/lclark.edu/drake/
>> > >>>
>> > >>> _______________________________________________
>> > >>> Computer-go mailing list
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>> > >>> http://computer-go.org/mailman/listinfo/computer-go
>> > >>>
>> > >>
>> > >> _______________________________________________
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>> > >
>> > >
>> > >
>> > > --
>> > > Peter Drake
>> > > https://sites.google.com/a/lclark.edu/drake/
>> > >
>> >
>> >
>> >
>> > --
>> > Peter Drake
>> > https://sites.google.com/a/lclark.edu/drake/
>>
>> > _______________________________________________
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>> > Computer-go at computer-go.org
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>>
>>
>> --
>>                                 Petr Baudis
>>         If you have good ideas, good data and fast computers,
>>         you can do almost anything. -- Geoffrey Hinton
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>
>
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-- 
Peter Drake
https://sites.google.com/a/lclark.edu/drake/
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