[Insight-users] itk.PyBuffer memory leak

[Gaëtan Lehmann]

Le 13 mai 09 à 10:35, Rick Giuly a écrit :

>
> I've now tested invoking garbage collection with gc.collect() at  
> every iteration and that didn't change the problem. So, my best  
> guess would be that the image is not deleted when the python object  
> is destroyed. Maybe a bug?

Maybe - can you file a bug on ITK's bug tracker and assign it to me?
I'll try to find a bit of time to investigate this in the next days.

>
>
>
> Gaëtan Lehmann wrote:
>> Hi Rick,
>> GetImageFromArray() returns a smart pointer to an image, so the  
>> image should be deallocated once the python object is destroyed.
>> Perhaps the problem is there: the garbage collection my not run  
>> fast enough.
>> The right way to go may be to implement PyBuffer as a filter which  
>> reuse the output image, as all the filters in itk.
>> For the Delete() method: you shouldn't use it in python (and I  
>> can't see any case for use it but the internal memory management in  
>> c++). In the latest version of wrapitk (the one hosted at  
>> googlecode), Delete() and the other methods related to smart  
>> pointers are hidden.
>> Regards,
>> Gaëtan
>> Le 11 mai 09 à 05:43, Rick Giuly a écrit :
>>>
>>> Hello All,
>>>
>>> It seems that converter.GetImageFromArray(inputNumpyVolume)  
>>> allocates memory in some way and never releases it. When I tried  
>>> using Delete() the program actually crashed silently after one  
>>> iteration.
>>>
>>> Test code is below. (I'm running this on ubuntu, and the itk  
>>> package is from Paul Novo's site.)
>>>
>>> Is there some way to release memory?
>>>
>>>
>>>
>>> import itk
>>> import numpy
>>>
>>> for i in range(10000):
>>>
>>>   print i
>>>
>>>   ImageType = itk.Image[itk.F, 3]
>>>   converter = itk.PyBuffer[ImageType]
>>>
>>>   inputNumpyVolume = numpy.ones((100, 100, 200))
>>>   inputVolume = converter.GetImageFromArray(inputNumpyVolume)
>>>   #inputVolume.Delete()
>>>
>>>
>>>
>>> ----------
>>> Thanks,
>>> --Rick
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>

-- 
Gaëtan Lehmann
Biologie du Développement et de la Reproduction
INRA de Jouy-en-Josas (France)
tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
http://voxel.jouy.inra.fr  http://www.mandriva.org
http://www.itk.org  http://www.clavier-dvorak.org

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