#13370: Do not cache the result of is_Field externally
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Reporter: SimonKing |
Owner: rlm
Type: defect |
Status: positive_review
Priority: major |
Milestone: sage-5.8
Component: memleak |
Resolution:
Keywords: | Work
issues:
Report Upstream: N/A |
Reviewers: Nils Bruin
Authors: Simon King | Merged
in:
Dependencies: #11310, #12215, #11521, #12313, #13089, #12995 |
Stopgaps:
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Comment (by nbruin):
Something that struck me. With the current trick,
{{{
sage: R=ZZ.quo(7)
sage: %timeit R in Fields()
}}}
is going to be pretty efficient, because the category of R reflects it's a
field after the first test. However,
{{{
sage: R=ZZ.quo(15)
sage: %timeit R in Fields()
}}}
probably isn't efficient (but it probably wasn't before either), because
there's no way to register it's NOT a field in its category.
I recognize that frequently asking whether a field is indeed a field will
happen a lot, whereas frequently confirming something is NOT a field will
probably be considerably less common, so perhaps it's not a problem. It
does reflect that this solution is accomplishing something quite different
from just making `is_Field` efficient without external cache.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13370#comment:55>
Sage <http://www.sagemath.org>
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