#14356: memleak in UniqueRepresentation / Poset
-----------------------+----------------------------------------------------
Reporter: vbraun | Owner: rlm
Type: defect | Status: new
Priority: major | Milestone: sage-5.9
Component: memleak | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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Its easy to construct posets whose element labels refer back to the poset,
for example in toric varieties the face lattice is labelled by cones of
the fan. The result is that everything is unconditionally alive because
the !UniqueRepresentation !WeakValueDictionary has a key referring back to
the poset:
{{{
sage: class Foo:
....: pass
....:
sage: foo = Foo()
sage: foo.dag = random_DAG(10)
sage: foo.poset = Poset(foo.dag, element_labels=[(i,foo) for i in
range(10)], key=id(foo))
sage: del foo
sage:
sage: import gc
sage: gc.collect()
591
sage: print [ x for x in gc.get_objects() if
isinstance(x,sage.combinat.posets.posets.FinitePoset) ]
[Finite poset containing 10 elements]
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14356>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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