#6623: Memory leak when calling binomial
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Reporter: hartke | Owner:
Type: defect | Status: new
Priority: major | Milestone:
Component: symbolics | Keywords: binomial, leak
Reviewer: | Author:
Merged: |
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Description changed by mvngu:
Old description:
> There appears to be a memory leak when repeatedly calling binomial with
> different parameters. This sometimes also appears when the parameters to
> binomial are not varied, but is not consistent. This is a problem for
> the Combinations rank code, which makes many repeated calls to binomial.
>
> {{{
> sage: import random
> print get_memory_usage()
> for i in xrange(100000):
> x=random.randint(10,100)
> y=random.randint(0,x)
> r=binomial(x,y)
> print get_memory_usage()
>
> 730.6328125
> 736.5625
> }}}
>
> The output is from running the code in Sage 4.1 on sagenb.org. I think
> the same problem may involve the symbolic backend and GiNaC, since the
> same problem also occurs with log.
New description:
There appears to be a memory leak when repeatedly calling binomial with
different parameters. This sometimes also appears when the parameters to
binomial are not varied, but is not consistent. This is a problem for the
Combinations rank code, which makes many repeated calls to binomial.
{{{
sage: import random
print get_memory_usage()
for i in xrange(100000):
x=random.randint(10,100)
y=random.randint(0,x)
r=binomial(x,y)
print get_memory_usage()
730.6328125
736.5625
}}}
The output is from running the code in Sage 4.1 on sagenb.org. I think
the same problem may involve the symbolic backend and GiNaC, since the
same problem also occurs with log. See this
[http://groups.google.com/group/sage-
support/browse_thread/thread/5d202080e85ab1b8/2d71601ce86d7645 sage-
support] thread for some background discussion.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6623#comment:1>
Sage <http://sagemath.org/>
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