reference count problems

Stefan van der Walt stefan at sun.ac.za
Wed Nov 15 14:51:49 CST 2006


On Wed, Nov 15, 2006 at 02:33:52PM -0600, Robert Kern wrote:
> Mathew Yeates wrote:
> > Hi
> > I'm running a 64 bit Python 2.5 on an x86 with Solaris. I have a 
> > function I call over 2^32 times and eventually I run out of memory.
> > 
> > The function is
> > def make_B(deltadates):
> >     numcols=deltadates.shape[0]
> >     B=numpy.zeros((numcols,numcols))
> >     for ind in range(0,numcols): #comment out this loop and all is good
> >         B[ind,0:numcols] = deltadates[0:numcols]
> >     return B
> > 
> > 
> > If I comment out the loop lines, my memory is okay. I'm guessing that a 
> > reference is being added to "deltadates" and that the reference count is 
> > going above 2^32 and reseting. Anybody have any ideas about how I can 
> > cure this? Is Numpy increasing the reference count here?
> 
> Can you give us a small but complete and self-contained script that demonstrates
> the problem?

I think this might be related to ticket #378:

http://projects.scipy.org/scipy/numpy/ticket/378

Cheers
Stéfan

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