#14058: Weakly reference binary operation codomains
-------------------------------------+-------------------------------------
Reporter: robertwb | Owner: rlm
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.4
Component: memleak | Resolution:
Keywords: | Merged in:
Authors: Robert Bradshaw | Reviewers: Simon King
Report Upstream: N/A | Work issues: Fix doctests
Branch: | Commit:
u/SimonKing/weakly_reference_binary_operation_codomains|
90ed181ae9df152e99a652636a7e9dc29b466916
Dependencies: #12313 | Stopgaps:
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Comment (by SimonKing):
In the following example
{{{
sage: import gc
sage: from sage.rings.polynomial.plural import
NCPolynomialRing_plural
sage: from sage.algebras.free_algebra import FreeAlgebra
sage: A1.<x,y,z> = FreeAlgebra(QQ, 3)
sage: R1 = A1.g_algebra({y*x:x*y-z, z*x:x*z+2*x, z*y:y*z-2*y},
order=TermOrder('degrevlex', 2))
sage: A2.<x,y,z> = FreeAlgebra(GF(5), 3)
sage: R2 = A2.g_algebra({y*x:x*y-z, z*x:x*z+2*x, z*y:y*z-2*y},
order=TermOrder('degrevlex', 2))
sage: A3.<x,y,z> = FreeAlgebra(GF(11), 3)
sage: R3 = A3.g_algebra({y*x:x*y-z, z*x:x*z+2*x, z*y:y*z-2*y},
order=TermOrder('degrevlex', 2))
sage: A4.<x,y,z> = FreeAlgebra(GF(13), 3)
sage: R4 = A4.g_algebra({y*x:x*y-z, z*x:x*z+2*x, z*y:y*z-2*y},
order=TermOrder('degrevlex', 2))
sage: _ = gc.collect()
sage: foo = R1.gen(0)
sage: del foo
sage: del R1
sage: _ = gc.collect()
sage: del R2
sage: _ = gc.collect()
sage: del R3
sage: _ = gc.collect()
}}}
the reference counting goes wrong after each `gc.collect()`.
--
Ticket URL: <http://trac.sagemath.org/ticket/14058#comment:40>
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