#10179: LLL memory leak
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Reporter: bober | Owner: rlm
Type: defect | Status: new
Priority: major | Milestone:
Component: memleak | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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The following code demonstrates a memory leak in the fpLLL wrapper. I
looked at the source code for a few minutes and haven't been able to find
out where the leak is.
{{{
def leak():
M = MatrixSpace(ZZ, 10)
A = M.random_element()
n = 0
old_m = get_memory_usage()
old_n = 1
from sage.libs.fplll.fplll import FP_LLL
while 1:
n = n + 1
C = sage.libs.fplll.fplll.FP_LLL(A)
C.wrapper(0, .501, .99)
B = C._sage_()
m = get_memory_usage()
if m != old_m:
print n, n - old_n, ": current memory usage:",
get_memory_usage()
sys.stdout.flush()
old_m = m
old_n = n
}}}
When run, the output on my machine looks something like
{{{
sage: leak()
2666 2665 : current memory usage: 815.63671875
3503 837 : current memory usage: 815.765625
4327 824 : current memory usage: 815.89453125
5160 833 : current memory usage: 816.0234375
5990 830 : current memory usage: 816.15234375
6829 839 : current memory usage: 816.28125
7661 832 : current memory usage: 816.41015625
8492 831 : current memory usage: 816.5390625
9332 840 : current memory usage: 816.66796875
10160 828 : current memory usage: 816.796875
10989 829 : current memory usage: 816.92578125
11824 835 : current memory usage: 817.0546875
12648 824 : current memory usage: 817.18359375
13478 830 : current memory usage: 817.3125
14315 837 : current memory usage: 817.44140625
15142 827 : current memory usage: 817.5703125
15980 838 : current memory usage: 817.69921875
16817 837 : current memory usage: 817.828125
17636 819 : current memory usage: 817.95703125
18466 830 : current memory usage: 818.0859375
19292 826 : current memory usage: 818.21484375
20128 836 : current memory usage: 818.34375
20961 833 : current memory usage: 818.47265625
21792 831 : current memory usage: 818.6015625
22628 836 : current memory usage: 818.73046875
23465 837 : current memory usage: 818.859375
24301 836 : current memory usage: 818.98828125
25133 832 : current memory usage: 819.1171875
25957 824 : current memory usage: 819.24609375
26789 832 : current memory usage: 819.375
27621 832 : current memory usage: 819.50390625
28456 835 : current memory usage: 819.6328125
29287 831 : current memory usage: 819.76171875
30127 840 : current memory usage: 819.890625
30955 828 : current memory usage: 820.01953125
31782 827 : current memory usage: 820.1484375
32608 826 : current memory usage: 820.27734375
33442 834 : current memory usage: 820.40625
34275 833 : current memory usage: 820.53515625
35113 838 : current memory usage: 820.6640625
[...]
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10179>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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