#9129: sqrt memory leaks
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Reporter: zimmerma | Owner: AlexGhitza
Type: defect | Status: new
Priority: critical | Milestone: sage-5.1
Component: basic arithmetic | Resolution:
Keywords: sd35.5 | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Old description:
> cf http://groups.google.com/group/sage-
> support/browse_thread/thread/8c18b2b91004c35a#:
> {{{
> sage: m = get_memory_usage()
> sage: while True:
> a = ZZ(randint(2^400,2^800)).sqrt()
> print get_memory_usage(m)
> }}}
> I noticed another sqrt-related memory leak:
> {{{
> sage: cat leak.sage
> for i in range(10^6):
> Mod(2^32+1,3).sqrt()
> if i % 10000 == 0:
> print i, get_memory_usage()
> sage: load leak.sage
> 0 947.37109375
> 10000 970.4375
> 20000 993.8671875
> 30000 1017.25
> 40000 1040.734375
> 50000 1064.19921875
> ...
> }}}
> This leaks about 23Mb per 10^^4 loops, thus about 2.3Kb per loop!
New description:
cf http://groups.google.com/group/sage-
support/browse_thread/thread/8c18b2b91004c35a#:
{{{
sage: m = get_memory_usage()
sage: while True:
a = ZZ(randint(2^400,2^800)).sqrt()
print get_memory_usage(m)
}}}
or simpler:
{{{
m = get_memory_usage()
i=0
while True:
i+=1
a = 2.sqrt()
if i%1000==0:
print get_memory_usage(m)
}}}
--
Comment (by zimmerma):
I updated the description.
Paul
PS: it seems the "stopgaps" were deleted, but I don't know which value it
was...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9129#comment:24>
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