#11521: Memleak when resolving the action of Integers on an Elliptic Curve
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Reporter: jpflori | Owner: robertwb
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.8
Component: coercion | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by SimonKing):
I think we have a different problem here.
The finite fields themselves should be cached. The cache (see `GF._cache`)
uses weak references, which should be fine.
Also, there are special methods `zero_element` and `one_element` which
should do caching, because zero and one are frequently used and should not
be created over and over again.
However, it seems that ''all'' elements of a finite field are cached - and
that's bad!
{{{
sage: K = GF(5)
sage: K(2) is K(2)
True
sage: K.<a> = GF(17^2)
sage: K(5) is K(5)
True
}}}
I see absolutely no reason why all `17^2` elements should be cached.
Fortunately, we have no caching for larger finite fields:
{{{
sage: K.<a> = GF(17^10)
sage: K(5) is K(5)
False
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11521#comment:20>
Sage <http://www.sagemath.org>
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