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I'm getting a memory leak with simple calls from .NET to Python function. The issue is reproducible on all pythonnet versions that I tested. When I test Python calls to .NET, then the memory leak is less obvious, since all resources are released when calling the CPythongc.collect(). Calling the same function from .NET does not release any resources, but calling the CLRGC.WaitForPendingFinalizers() blocks the execution.
>>>importclr>>>importSystem>>>foriinrange(20000000):...a=System.Double(i)...>>>importgc>>>gc.collect()
pyinclr.py
deftestmethod():return"abc"*3
usingSystem;usingPython.Runtime;namespacememoryleakpykw{classProgram{staticvoidMain(string[]args){PyObjectpymodule;PyObjectgc;PyObjecttestmethod;PythonEngine.Initialize();IntPtrpylock=PythonEngine.AcquireLock();{PyObjectsys=PythonEngine.ImportModule("sys");// Py.Import("sys");gc=PythonEngine.ImportModule("gc");// Py.Import("sys");sys.GetAttr("path").InvokeMethod("append",newPyString(@"C:\Users\denis.akhiyarov\source\repos\memoryleakpykw\pyinclr"));pymodule=PythonEngine.ImportModule("pyinclr");testmethod=pymodule.GetAttr("testmethod");}PythonEngine.ReleaseLock(pylock);Console.WriteLine("starting test for memory leak, press any key");Console.ReadKey();pylock=PythonEngine.AcquireLock();{for(inti=1;i<=1000000;i++){testmethod.Invoke();}}gc.InvokeMethod("collect");PythonEngine.ReleaseLock(pylock);GC.Collect();//GC.WaitForPendingFinalizers(); // this blocks executionGC.Collect();Console.WriteLine("finished test for memory leak, press any key");Console.ReadKey();}}}