#12215: Memleak in UniqueRepresentation, @cached_method
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Reporter: vbraun | Owner: rlm
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.8
Component: memleak | Keywords: UniqueRepresentation cached_method
caching
Work_issues: fix it... | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #11115 #11900
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Comment(by SimonKing):
Now I understand the problem:
`SymmetricFunctions` is a subclass of `UniqueRepresentation`. By my patch,
`UniqueRepresentation` is using weak references. Apparently
`SymmetricFunctions` therefore can be garbage collected, but - and now
comes the strange point - the coercion system still recalls that a
coercion to them has already been registered.
Anyway, with my patch, `SymmetricFunctions(ZZ)` and
SymmetricFunctions(QQ)` are created repeatedly, and that's bad.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12215#comment:49>
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