[IronPython] Memory Leak in IronPython 2.6 RC3

[Jonathan Howard]

That looks like it's removing that memory leak.  I'm not positive
that's the one we're having in our production code, but it certainly
can't hurt.

On Nov 25, 5:37 am, Dino Viehland <di... at microsoft.com> wrote:
> My guess here (I'm on vacation so I haven't tried this) is that some exception info
> is not getting cleared -
>
> ExceptionHelpers.DynamicStackFrames = null;
>
> In the catch block will probably fix it although we should probably
> do this ourselves.
>
>
>
>
>
> > -----Original Message-----
> > From: users-boun... at lists.ironpython.com [mailto:users-
> > boun... at lists.ironpython.com] On Behalf Of Jonathan Howard
> > Sent: Tuesday, November 24, 2009 4:45 PM
> > To: us... at lists.ironpython.com
> > Cc: jfelk... at drawloop.com
> > Subject: [IronPython] Memory Leak in IronPython 2.6 RC3
>
> > 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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