#715: Parents probably not reclaimed due to too much caching
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Reporter: robertwb |
Owner: somebody
Type: defect |
Status: needs_review
Priority: major |
Milestone: sage-5.4
Component: coercion |
Resolution:
Keywords: weak cache coercion Cernay2012 | Work
issues:
Report Upstream: N/A |
Reviewers: Jean-Pierre Flori, Simon King, Nils Bruin
Authors: Simon King, Jean-Pierre Flori | Merged
in:
Dependencies: #9138, #11900, #11599, to be merged with #11521 |
Stopgaps:
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Comment (by SimonKing):
Replying to [comment:290 nbruin]:
> Further desperate facts that may or may not be relevant:
> - if you make `TripleDict` strong on ''any'' of its keys, the segfault
disappears.
Do you really say: ''Any''? I ask, because the "classical" application of
`TripleDict` in sage.structure.coerce would either have `None` (for
coercion maps) or an operation (for actions) as third key item.
Hence, if a strong reference to the third key items of `TripleDict`
suffices to fix the problem, then I reckon the "non-classical" use of
`TripleDict` in #11521 is involved in the segfault: The cache for Homsets,
which has categories as third key items.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/715#comment:292>
Sage <http://www.sagemath.org>
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