#11521: Memleak when resolving the action of Integers on an Elliptic Curve
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Reporter: jpflori | Owner: robertwb
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.8
Component: coercion | Keywords: sd35
Work_issues: | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #11900 #715
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Comment(by SimonKing):
Hi Jean-Pierre,
Replying to [comment:81 jpflori]:
> I guess you're solution should be the right one because resetting the
coercion cache solves the problem, so dealing with it should be enough for
the example in the ticket description.
But it is not so easy because...
> Only one copy gets cached in _action_hash because the curves are equal
(==) but not identical (is).
... elliptic curves are not unique parents.
I think it would be a mistake to use a weak reference to the value of
`TripleDict`. I tried and got many errors - and I think this was because
some important data (homsets, actions, ...) was garbage collected even
though there was still a strong reference to domain and codomain. In that
situation, the value must not be garbage collected.
> sage: len(L) # mmm got one left!!! not sure where it comes from yet...
Don't forget the last copy of E that was defined in the loop!
Since I think that a weak reference to the values of `TripleDict` won't
work: What else could one do? Or perhaps I should try again: It could be
that the errors came from the wrong choice of a callback function.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11521#comment:82>
Sage <http://www.sagemath.org>
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