#4935: is_perfect_power leaks
----------------------+-----------------------------------------------------
Reporter: mabshoff | Owner: robertwb
Type: defect | Status: new
Priority: major | Milestone: sage-3.3
Component: memleak | Resolution:
Keywords: |
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Comment (by robertwb):
Hmm... perhaps it's just the integer pool filling up?
{{{
sage: get_memory_usage()
'415M'
sage: time len([a for a in srange(10**6) if not
(-a^3).is_perfect_power()])
CPU times: user 5.68 s, sys: 1.01 s, total: 6.69 s
Wall time: 9.47 s
241224
sage: get_memory_usage()
'431M'
sage: time len([a for a in srange(10**6) if not
(-a^3).is_perfect_power()])
CPU times: user 5.55 s, sys: 0.90 s, total: 6.45 s
Wall time: 6.53 s
241224
sage: get_memory_usage()
'431M'
sage: time len([a for a in srange(10**6) if not
(-a^3).is_perfect_power()])
CPU times: user 5.58 s, sys: 0.92 s, total: 6.50 s
Wall time: 6.58 s
241224
sage: get_memory_usage()
'431M'
}}}
And a fresh start
{{{
----------------------------------------------------------------------
| Sage Version 3.2.2, Release Date: 2008-12-18 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
Loading Sage library. Current Mercurial branch is: bugs
sage: get_memory_usage()
'415M'
sage: time len(srange(10**6))
CPU times: user 0.40 s, sys: 0.16 s, total: 0.56 s
Wall time: 0.57 s
1000000
sage: get_memory_usage()
'431M'
}}}
So it's something in srange or the integer pool or something... Or the
fact that the large number of objects that all get allocated at the same
time enlarge the heap (and it never gives it back).
{{{
sage: get_memory_usage()
'415M'
sage: len(ZZ.range(10^6))
1000000
sage: get_memory_usage()
'431M'
}}}
Also
{{{
sage: get_memory_usage()
'415M'
sage: time len([True for a in (1..10**6) if not
(-a^3).is_perfect_power()])
CPU times: user 9.90 s, sys: 0.96 s, total: 10.86 s
Wall time: 10.98 s
241225
sage: get_memory_usage()
'415M'
}}}
shows that is_perfect_power is clean, so I think it's just a heap with a
million live elements that doesn't shrink back down when the list is
freed.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4935#comment:5>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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