#4380: Memory Leak in libsingular
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Reporter: SimonKing | Owner: malb
Type: defect | Status: new
Priority: major | Milestone: sage-3.2.1
Component: commutative algebra | Keywords: memory leak libsingular
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At http://groups.google.com/group/sage-
support/browse_thread/thread/b997f95c1e2503e0/5db5f9e7d4c8faf2 was
discussion about a memory leak. I found a reasonably short bit of code
that triggers the leak.
In `test.pyx`:
{{{
from sage.all import copy
def Test(I):
R=I.ring()
p=R.random_element()
J0=list(I.reduced_basis())
while(1):
J = copy(J0)
for i in range(100):
q=p.reduce(J)
J.append(q)
}}}
Apparently the memory consumption should not grow, since `J` returns to
its original state after finishing the `for` loop. However, the following
`Sage` session is leaking (i.e., the memory consumption grows rapidly, and
after a few seconds 1GB are filled up):
{{{
sage: attach test.pyx
Compiling /home/king/Projekte/f5/test.pyx...
sage: from sage.rings.ideal import Cyclic
sage: R=PolynomialRing(QQ,'x',5)
sage: I=Cyclic(R).homogenize()
sage: Test(I)
}}}
The `while` loop comprises
1. copying of a Sequence (`J0`) of `MPolynomial_libsingular`
2. reduction of `MPolynomial_libsingular`
3. appending to a Sequence.
In one of these three steps must be the leak. I suspect it is the
reduction and will try to verify it.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4380>
Sage <http://sagemath.org/>
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