#14058: Weakly reference binary operation codomains
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Reporter: robertwb | Owner: rlm
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.4
Component: memleak | Resolution:
Keywords: | Merged in:
Authors: Robert Bradshaw, | Reviewers: Simon King
Nils Bruin | Work issues:
Report Upstream: N/A | Commit:
Branch: | 9793dbc9bc64bfdce43ff1e626453816c302696d
u/SimonKing/weakly_reference_binary_operation_codomains| Stopgaps:
Dependencies: #12313 |
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Comment (by SimonKing):
Sometimes, the following test in sage/categories/fields.py has failed:
{{{
sage: import gc
sage: _ = gc.collect()
sage: n = len([X for X in gc.get_objects() if isinstance(X,
sage.rings.finite_rings.integer_mod_ring.IntegerModRing_generic)])
sage: for i in prime_range(100):
....: R = ZZ.quotient(i)
....: t = R in Fields()
sage: _ = gc.collect()
sage: len([X for X in gc.get_objects() if isinstance(X,
sage.rings.finite_rings.integer_mod_ring.IntegerModRing_generic)]) - n
1
}}}
The reason for the failure: Sometimes the last line gave 0, not 1. It is
not totally clear to me why the different results occurred. But in fact 0
is better than 1 here (one additional ring got collected). So, I hope my
change is OK.
--
Ticket URL: <http://trac.sagemath.org/ticket/14058#comment:45>
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