reference count problems

Robert Kern robert.kern at
Wed Nov 15 14:33:52 CST 2006

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?

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco

Take Surveys. Earn Cash. Influence the Future of IT
Join's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys - and earn cash

More information about the Numpy-discussion mailing list