[Python.NET] Memory leak problem in function "AsManagedObject"

[Denis Akhiyarov]

Your binaries are rather outdated..

Here is the latest branch:

https://github.com/pythonnet/pythonnet/tree/develop

And binaries here:

https://pypi.python.org/pypi/pythonnet/2.1.0.dev1

http://www.lfd.uci.edu/~gohlke/pythonlibs/#pythonnet

On Mon, Jan 18, 2016, 4:47 PM Eliana Mendes <eliana.mendesp at gmail.com>
wrote:

> Hello Tony,
>
>
>
> Thanks a lot for your answer! I actually just got directly the
> “Python.Runtime.dll”  from the download link in sourceforge:
> http://sourceforge.net/projects/pythonnet/files/. But from the
> description I see that the last update of that one was done in 2013. Would
> there be a newer version somewhere else that I could get?  Perhaps this
> version I’m using is out of date and you have a newer one. Let me know if
> that’s the case.
>
>
>
> I tried your suggestion of putting the “using” statement for the tuple
> objects, and also for “myTuple”, and the memory is still increasing a lot.
> I’ve made a memory profile to see which objects are being retained and
> after I ran that statement 5 thousand times I got this:
>
>
> [image: Imagem inline 1]
>
>
> As you can see more that 12 thousand instances of “PyInt” and more than 6
> thousand of “PyObject” are created . Apparently it is creating these
> “PyInt” and “PyObjects” somewhere inside the “AsManagedObject”, because I
> don’t have PyInt objects anywhere in my code and this just happens when I
> call “AsManagedObject”.
>
>
>
> Let me know if there is a newer version that could probably have that
> problem fixed which I am not aware of.
>
>
> I appreciate a lot your help!
>
>
>
> Best regards,
>
> Eliana
>
> 2016-01-17 6:05 GMT-06:00 Tony Roberts <tony at pyxll.com>:
>
>> Hi Eliana,
>>
>> which version of pythonnet are you using? when you say you're using the
>> latest are you building it yourself from the develop branch on github?
>>
>> I had a quick look at the code that converts from a python object to a
>> double, and I don't see any obvious memory leaks there. Perhaps the leak is
>> the objects resulting from indexing into the tuple are never getting
>> disposed? Try something like this instead and see if it helps (and report
>> back as it may help improve the code if we know exactly what the problem
>> is).
>>
>> PyTuple myTuple = PyTuple.AsTuple(result);
>>
>> double result0;
>> using (var item0 = myTuple[0])
>>     result0 = (double)item0.AsManagedObject(typeof(double));
>>
>> double result1;
>> using (var item1 = myTuple[1])
>>     result1 = (double)item1.AsManagedObject(typeof(double));
>>
>> myTuple.Dispose();
>>
>> I would also use a using statement for the myTuple as well, just to be
>> sure dispose is called in the case an exception is thrown somewhere.
>>
>> Regards,
>> Tony
>>
>>
>> On Fri, Jan 15, 2016 at 8:06 PM Eliana Mendes <eliana.mendesp at gmail.com>
>> wrote:
>>
>>> Hello experts,
>>>
>>>
>>>
>>> I'm having a memory leak problem when using the
>>> function AsManagedObject(typeof(double)). Basically I have something like
>>> this:
>>>
>>>
>>>
>>> PyTuple myTuple = PyTuple.AsTuple(result);
>>>
>>> double result0 = (double)myTuple[0].AsManagedObject(typeof(double));
>>>
>>> double result1 = (double)myTuple[1].AsManagedObject(typeof(double));
>>>
>>> myTuple.Dispose();
>>>
>>>
>>>
>>> where "result" is just a PyObject that returned from a python function.
>>> I simplified the code above just so you can understand better, but the
>>> thing is that the line that calls "AsManagedObject”  is executed thousands
>>> of times and it is increasing significantly the memory heap (it goes over 3
>>> GB of memory in my scenario and it’s not released after execution). If I
>>> don't call just this specific function the memory remains stable. But I
>>> don’t know any other way to convert the PyObject to "double" unless using
>>> the “AsManagedObject” function.
>>>
>>> It sounds to me that some objects are allocated inside the
>>> "AsManagedObject" method and they are not being released. Maybe it’s a bug
>>> there. Any ideas? I'm using latest version of python for .NET.
>>>
>>>
>>>
>>> Thank you!
>>>
>>>
>>> Eliana Mendes
>>>
>>> Software Engineer
>>>
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>>> Python.NET mailing list - PythonDotNet at python.org
>>> https://mail.python.org/mailman/listinfo/pythondotnet
>>
>>
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