Hi,
What's the purpose of IronPython.Rumtime.WeakRefTracker?
I did run the attached program (which is similar to the example for
http://ironpython.codeplex.com/workitem/31764).
After running a bunch of scripts, the program calls GC.Collect() and
GC.WaitForPendingFinalizers() several times.
At that moment, the code does not hold any reference to any IronPython or
Scripting related objects, so I'd expect everything to be cleaned up by the GC.
Despite that fact, I found out that the program spends several seconds with
100% CPU load after returning from the Main() method. When Breaking it in the
Debugger several times, it did always end up in the Finalizer method of the
WeakRefTracker, so my guess is that most of those several seconds are spent
there.
Best regards
Markus Schaber
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namespace IronPythonLeakTest
{
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;
using IronPython.Hosting;
using IronPython.Runtime;
using IronPython.Runtime.Exceptions;
using IronPython.Runtime.Types;
using Microsoft.Scripting;
using Microsoft.Scripting.Hosting;
using System.Diagnostics;
using System.IO;
public static class ScriptExecutor
{
private static readonly TextWriter Window = Console.Out;
private const string LIB_PATH = @"C:\Program Files
(x86)\IronPython 2.7.1\Lib";
private static void Main()
{
try
{
ExecuteRuns(50);
}
finally
{
Console.ReadLine();
}
}
internal static void ExecuteRuns(int runs)
{
long afterFirst = 0;
long beforeStart = 0;
try
{
beforeStart = GC.GetTotalMemory(true);
Execute(0);
afterFirst = GC.GetTotalMemory(true);
for (int i = 1; i < runs; i += 1)
{
Execute(i);
}
}
finally
{
long afterLast = GC.GetTotalMemory(false);
Window.WriteLine("Script Finished");
Window.Write("First run: {0}Mb, {1} runs:
{2}Mb, avg = {3}",
Math.Round((afterFirst - beforeStart) /
(1024.0 * 1024), 1),
runs,
Math.Round((afterLast - beforeStart) /
(1024.0 * 1024), 1),
Math.Round((afterLast - beforeStart) /
(1024.0 * 1024 * runs), 1))
;
for (int i = 0; i < 5; i += 1)
{
Application.DoEvents();
GC.Collect();
Thread.Sleep(100);
GC.WaitForPendingFinalizers();
}
long afterGC = GC.GetTotalMemory(true);
Window.WriteLine("After GC: {0}Mb, avg = {1}",
Math.Round((afterGC - beforeStart) /
(1024.0 * 1024), 1),
Math.Round((afterGC - beforeStart) /
(1024.0 * 1024 * runs), 1))
;
}
}
private static void Execute(int i)
{
DateTime start = DateTime.Now;
string src = String.Format("from __future__ import
print_function \n"
+ "import os, warnings \n"
+ "write('hallo: %s\t ' % {0}) \n", i);
ScriptEngine engine = Python.CreateEngine();
ScriptRuntime runtime = engine.Runtime;
ScriptScope mainScope = engine.CreateScope();
runtime.LoadAssembly(typeof(IronPython.Modules.PythonNT).Assembly);
ScriptSource scriptSource =
engine.CreateScriptSourceFromString(src, "TestScript",
SourceCodeKind.AutoDetect);
var compiledCode =
scriptSource.Compile(ErrorListenerImpl.INSTANCE);
// Set the search pathes.
engine.SetSearchPaths(new[] { LIB_PATH });
engine.SetTrace(TRACE_FUNC);
//var warningModule = engine.ImportModule("warnings");
mainScope.SetVariable("write", new
Action<object>(Window.Write));
compiledCode.Execute(mainScope);
Window.WriteLine("{0}s - \t {1} \t- {2}",
Math.Round((DateTime.Now - start).TotalSeconds,
1),
GC.GetTotalMemory(false),
GC.CollectionCount(0));
}
private static readonly TracebackDelegate TRACE_FUNC =
TraceFunc;
private static TracebackDelegate TraceFunc(TraceBackFrame
frame, string result, object payload)
{
return TRACE_FUNC;
}
}
public delegate void ShowWarning(
CodeContext context, object message, PythonType category,
string filename, int lineno,
[DefaultParameterValue(null)] object file,
[DefaultParameterValue(null)] string line);
class ErrorListenerImpl : ErrorListener
{
public static readonly ErrorListenerImpl INSTANCE = new
ErrorListenerImpl();
public override void ErrorReported(ScriptSource source, string
stMessage, Microsoft.Scripting.SourceSpan span, int errorCode,
Microsoft.Scripting.Severity severity)
{
Console.WriteLine(stMessage);
}
}
}
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