#715: Parents probably not reclaimed due to too much caching
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Reporter: robertwb | Owner: somebody
Type: defect | Status: needs_info
Priority: major | Milestone: sage-4.8
Component: coercion | Keywords: weak cache coercion
Work_issues: avoid regression | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #9138, #11900
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Comment(by SimonKing):
There are two occasions for writing stuff into `Parent._action_hash`:
During initialisation, via register_action, and in addition the action is
stored in the parent when a new action is found while calling get_action.
Perhaps we should distinguish the two cases: The actions that are stored
during initialisation should probably be "immortal". But the actions that
is stored on the fly should only be weakly cached.
I think this can be solved by changing `Parent._action_hash` into a
dictionary that uses weak references to both the keys and the values.
There is one difference between register_action and get_action:
register_action additionally stores the actions in a list, but get_action
doesn't. Hence, indeed the actions registered during initialisation will
survive, but the stuff stored by get_action could become collectable.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/715#comment:91>
Sage <http://www.sagemath.org>
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