[Numpy-discussion] Memory leak with numpy master

Frédéric Bastien nouiz@nouiz....
Mon Sep 24 13:17:16 CDT 2012


Hi,

with numpy '1.6.1', I have no problem.

With numpy 1.7.0b2, I can reproduce the problem.

HTH

Fred


On Mon, Sep 24, 2012 at 1:04 PM, Gael Varoquaux
<gael.varoquaux@normalesup.org> wrote:
> Hi list,
>
> I think that I am hit a memory leak with numpy master. The following code
> enables to reproduce it:
>
> ________________________________________________________________________________
> import numpy as np
> n = 100
> m = np.eye(n)
> for i in range(30000):
>     #np.linalg.slogdet(m)
>
>     t, result_t = np.linalg.linalg._commonType(m)
>     a = np.linalg.linalg._fastCopyAndTranspose(t, m)
>
>     pivots = np.zeros((n,), np.linalg.linalg.fortran_int)
>     results = np.linalg.lapack_lite.dgetrf(n, n, a, n, pivots, 0)
>     d = np.diagonal(a)
>
>     if not i % 1000:
>         print i
> ________________________________________________________________________________
>
> If you execute this code, you'll see the memory go steadily up.
>
> The reason that I came up with such a strange looking code is that in my
> codebase, I do repeated calls to np.linalg.slogdet. I came up with the
> code above by simplifying what is done in slogdet. I don't think that I
> can simplify any further and still reproduce the memory leak.
>
> Should I submit a bug report (in other words, can people reproduce?)?
>
> Cheers,
>
> Gaël
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