#18905: fix more leaks found in #18897
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Reporter: dimpase | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: memleak | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #18897 | Stopgaps:
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Comment (by SimonKing):
I think I know a potential solution.
The problem, by the above analysis: The polynomial ring cache is a weak
value dictionary. Generally, a strong reference chain from key to value
will prevent garbage collection of the key-value pair.
I suggest to remove the "global" polynomial ring cache. Instead, I suggest
that the polynomial ring constructor uses a weak value dictionary that is
stored as an attribute of the base ring (e.g., in `self.__cached_methods`,
which is available for all parents).
The weakly referenced values are polynomial rings. The keys are the list
of variable names and information on term order and implementation---so,
strong references to them shouldn't be problematic.
In that model, a strong reference chain from the base ring to the
polynomial ring would NOT prevent garbage collection, since in the worst
case it is a reference cycle (base ring <-> polynomial ring).
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Ticket URL: <http://trac.sagemath.org/ticket/18905#comment:32>
Sage <http://www.sagemath.org>
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