#14058: Weakly reference binary operation codomains
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Reporter: robertwb | Owner: rlm
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.4
Component: memleak | Resolution:
Keywords: | Merged in:
Authors: Robert Bradshaw, | Reviewers: Simon King, Frédéric
Nils Bruin | Chapoton, Jean-Pierre Flori
Report Upstream: N/A | Work issues:
Branch: | Commit:
public/ticket/14058 | 13cb2a78983efb8f4edb00d6d10f8fc7da62e80d
Dependencies: #12313 | Stopgaps:
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Comment (by slabbe):
In other doctests in the same file, `GF(3)`, `GF(7)` and `GF(41)` are also
created. While there are references to `GF(7)` and `GF(41)`, no variable
references to `GF(3)` which is available for gargage collection. If
`GF(3)` gets garbage collected before the offending doctest, then
everything is fine, the doctest pass. But it can also be garbage collected
in the call to `gc.collect()` in the doctest. If this is the case, then
`N0` was also counting `GF(3)` which explains why `N2-N0` can be negative.
One way to fix this is to call `gc.collect()` before creating `N0`.
(my first fix was using sets of ids... sorry for the noise).
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Ticket URL: <http://trac.sagemath.org/ticket/14058#comment:68>
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