#18897: Memory leak in polynomial_compiled.univar_pd
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Reporter: slabbe | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: memleak | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by slabbe):
Ok, so it seems to come from calling {{{roots}}} on an element of the
{{{Univariate Polynomial Ring in x over Algebraic Field}}} :
{{{
#!python
def test():
import gc
from collections import Counter
gc.collect()
pre={id(c) for c in gc.get_objects()}
R.<x> = QQbar['x']
p = x^5 - 8*x^4 + 21*x^3 - 22*x^2 + 9*x - 1
for _ in range(100):
#p.factor() # which then calls:
#QQbar._factor_univariate_polynomial(p) # which then calls:
p.roots()
gc.collect()
post=Counter(type(o) for o in gc.get_objects() if id(o) not in pre)
return [(k,v) for (k,v) in post.iteritems() if v>10]
}}}
We get:
{{{
#!python
sage: test()
[(<type 'sage.rings.polynomial.polynomial_compiled.univar_pd'>, 1000)]
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18897#comment:5>
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