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Description
Environment
- Pythonnet version: 3.0.1
- Python version: 3.9.12
- Operating System: Windows or Linux
- .NET Runtime: net6.0
Details
- Describe what you were trying to get done.
We are embedding Python in a .NET app using pythonnet.
The call to PythonEngine.Shutdown() at the exit of this app lasts for more than 2 minutes.
Looking at the shutdown with a profiler shows that most of the time is spent in Runtime.TryCollectingGarbage().
Looks like the more memory is allocated on the C# side the more the shutdown (i.e. calls to GC.Collect()) is slow.
- Minimal, Complete, and Verifiable example
using Python.Runtime;
namespace Test;
static class Program
{
static void Main()
{
var mem = new List<Array>();
Runtime.PythonDLL = @$"{Environment.GetFolderPath(Environment.SpecialFolder.UserProfile)}\AppData\Local\Programs\Python\Python39\python39.dll";
PythonEngine.Initialize();
var threadState = PythonEngine.BeginAllowThreads();
using (Py.GIL())
{
using (var scope = Py.CreateScope())
{
scope.Set("a", 1);
scope.Set("b", 2);
scope.Exec("result = a + b");
var result = scope.Get("result").As<int>();
Console.WriteLine($"Sum = {result}");
}
}
// allocate dotnet-managed memory unrelated to pythonnet
var rnd = new Random();
for (var i = 0; i < 100_000_000; ++i)
{
mem.Add(new byte[rnd.Next(1, 10)]);
}
PythonEngine.EndAllowThreads(threadState);
Console.WriteLine("Shutdown start");
var start = DateTime.Now;
PythonEngine.Shutdown();
var diff = DateTime.Now - start;
Console.WriteLine($"Shutdown stop {diff.TotalSeconds}");
}
}Typical output:
Sum = 3
Shutdown start
Shutdown stop 61.6796983Metadata
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