[sage-combinat-devel] Re: Using lots of posets in Sage 5.0 and later causes high memory usage and eventual crash

2012-11-23 Thread Martin Malandro
Hi everyone,

I've dug around in the source code for several days now, and the issue is 
not in the poset code specifically. Rather, the above problem is being 
caused by this bug in UniqueRepresentation, which FinitePoset inherits from:

http://trac.sagemath.org/sage_trac/ticket/12215

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[sage-combinat-devel] Re: Using lots of posets in Sage 5.0 and later causes high memory usage and eventual crash

2012-11-23 Thread Simon King
Hi Martin,

On 2012-11-23, Martin Malandro m.e.malandr...@gmail.com wrote:
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 Content-Type: text/plain; charset=ISO-8859-1

 Hi everyone,

 I've dug around in the source code for several days now, and the issue is 
 not in the poset code specifically. Rather, the above problem is being 
 caused by this bug in UniqueRepresentation, which FinitePoset inherits from:

 http://trac.sagemath.org/sage_trac/ticket/12215

No surprise. The problem with #12215 and related tickets (#715, #11521,
#12313) is that some memory corruptions in libsingular become immanent
only when the garbage collection works properly - hence, before being
able to merge #12215 stably into sage, one needs to fix some bugs in
(lib)singular, part of which seem to be upstream bugs.

Cheers,
Simon

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