[IronPython] Memory Leak in IronPython 2.6 RC3

[Jonathan Howard]

I'm trying to track down a memory leak in our hosted IronPython
application as we upgrade to 2.6 from 1.1.2.  I saw a post at
stackoverflow ( 
http://stackoverflow.com/questions/1664567/embedded-ironpython-memory-leak
) showing how to set up the environment to avoid leaking memory, but
we're still having a memory leak.  If I take our identical setup code,
and use it on very simple code, there's no problem, but we have
thousands of lines of Python at this point.

Below is a minimum way to introduce a memory leak inside a hosted
IronPython application.  I don't know if it's the only way, or if it's
what's affecting us, but it does cause a leak:  (Obviously it needs
the appropriate DLLs etc.)

#############################################

using System;
using System.Threading;
using IronPython.Hosting;
using IronPython.Runtime;
using IronPython.Compiler;
using System.Collections.Generic;
using Microsoft.Scripting.Hosting;

namespace IPyTest
{
    class Program
    {
        static void Main(string[] args)
        {
            bool cont = true;
            while (cont)
            {
                var ipy = new IPy();
                try
                {
                    // Set the below boolean to "false" to run without
a memory leak
                    // Set it to "true" to run with a memory leak.
                    ipy.run(true);
                }
                catch { }
            }
        }
    }

    class IPy
    {
        private string scriptWithoutLeak = "import random;
random.randint(1,10)";
        private string scriptWithLeak = "raise Exception(), 'error'";

        public IPy()
        {
        }

        public void run(bool withLeak)
        {
            //set up script environment
            Dictionary<String, Object> options = new
Dictionary<string, object>();
            options["LightweightScopes"] = true;
            ScriptEngine engine = Python.CreateEngine(options);
            PythonCompilerOptions pco = (PythonCompilerOptions)
engine.GetCompilerOptions();
            pco.Module &= ~ModuleOptions.Optimized;
            engine.SetSearchPaths(new string[]{
                @"C:\Program Files\IronPython 2.6\Lib"
            });
            ScriptRuntime runtime = engine.Runtime;
            ScriptScope scope = runtime.CreateScope();
            var source = engine.CreateScriptSourceFromString(
                withLeak ? scriptWithLeak : scriptWithoutLeak
            );
            var comped = source.Compile();
            comped.Execute(scope);
            runtime.Shutdown();
        }
    }
}
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