[IronPython] IPyb5 performance

[Ronnie Maor]

Hi all,

I've finally managed to get my code running correctly under IPy2b5 - thanks
everyone who helped!

I'm now left with a performance problem. My code seems to run roughly 2
times slower:
* infra tests regressed from 19 seconds in IPy 1.1.1 to 33 seconds in IPy2b5
* application level tests regressed from 375 seconds in 1.1.1 to 705 seconds
in IPy2b5
(these are single measurements, but variance is not too big - about 5%)
startup time is also much longer, but I can live with that.

before trying to pinpoint the bottlenecks, I wanted to check I'm not missing
something stupid, like turning on optimizations in the DLR...
below is the hosting code I'm using to run the tests. I tried with and
without "Debug" flag, and it doesn't seem to change anything (except debug
allows me to understand the stack traces). I can also run the infra tests
with ipy directly, which showed that -O and -OO don't help either.

Is there something else I should be doing? any tips?
thanks!

// set up runtime and engine
            Dictionary<string, object> runtimeOptions = new
Dictionary<string, object>();
            runtimeOptions["Debug"] = true;
            ScriptRuntime runtime =
IronPython.Hosting.Python.CreateRuntime(runtimeOptions);
            runtime.LoadAssembly(typeof(String).Assembly); // Add reference
to System
            runtime.LoadAssembly(typeof(Uri).Assembly); // Add reference to
mscorlib
            engine = runtime.GetEngine("Python");
....

// run file as __main__
            engine.SetSearchPaths(new string[] {".", progdir, backend_dir,
stdlib_dir});

            List argv = new List();
            argv.append(filename);
            for (int i = 2; i < args.Length; ++i)
                argv.append(args[i]);
            engine.GetSysModule().SetVariable("argv", argv);

            mainScope = engine.CreateScope();
            mainScope.SetVariable("__name__", "__main__");
            var main_module =
Microsoft.Scripting.Hosting.Providers.HostingHelpers.GetScope(mainScope);
            runtime.Globals.SetVariable("__main__", main_module);
            mainScope.SetVariable("__file__",filename);

            ScriptSource source =
engine.CreateScriptSourceFromFile(filename, Encoding.Default,
SourceCodeKind.Statements);
            source.Execute(mainScope);
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