reference count problems

Mathew Yeates myeates at jpl.nasa.gov
Wed Nov 15 14:45:58 CST 2006


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'll try. But its in a complex program. BTW - I tried
B[ind,0:numcols] = deltadates[0:numcols].copy()
but that didn't work either.

Mathew


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