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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Memory Leak in python when using a C# DLL","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 2.3.0\r\n-   Python version: 3.6.1\r\n-   Operating System: Windows 7 Professional 64bits.\r\n-   .NET Framework 4.6 \r\n\r\n### Details\r\n\r\n-   I experience memory leaks when trying to use a C# dll in python to run a simulation and retrieve results using python.  When I try to run multiple time the calculation I get leaks\r\nHere is a template of code I run to experience this memory leak (replaced the name of the dll I use by generic names)\r\n\r\n```python\r\nimport clr\r\nimport os\r\nimport sys\r\nimport psutil\r\nimport gc\r\ndll_path = r''the path to my dll\"\r\nsys.path.append(os.path.join(dll_path, 'MyDll.dll'))\r\nclr.AddReference(os.path.join(dll_path, \"MyDll\"))\r\nwhile psutil.virtual_memory().percent \u003c 80:\r\n    print('psutil_virtual_memory:', psutil.virtual_memory().percent)\r\n    obj = MyDll.MyObject()\r\n    res = obj.Run() # long simulation is run and I get the results.\r\n    gc.collect()\r\n    clr.System.GC.Collect()\r\n```\r\nOutput : \r\n    psutil_virtual_memory: 41.8\r\n    psutil_virtual_memory: 44.4\r\n    psutil_virtual_memory: 46.6\r\n    psutil_virtual_memory: 48.9\r\n    .....\r\n   until my memory reach 80%\r\n\r\nThe issue is that running the equivalent code in C# does not give any memory leak but it's when calling it from python we get issues of memory leaks.  the python garbage collector doesn't help at all with this. I tried also to call the System GC Collect but without success too.\r\n\r\nMy question is how can I investigate and try to fix this issue. \r\n\r\n\r\n","author":{"url":"https://github.com/BreitA","@type":"Person","name":"BreitA"},"datePublished":"2017-11-24T14:11:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":15},"url":"https://github.com/577/pythonnet/issues/577"}