[IronPython] ScriptScope.SetVariable() performance

Dino Viehland dinov at microsoft.com
Thu Aug 12 18:42:14 CEST 2010

I'd suggest doing mScope.PH = editScope.  That will create a rule which will get cached and will generally run faster than passing the string directly.

The only other thing I can think of is maybe there's something odd w/ rule being produced because "editScope" is a dynamic object in SetupEdit so "mScope.SetVariable("PH", editScope);" ends up dispatching dynamically.  If you did "mScope.SetVariable("PH", (object)editScope);" it would dispatch statically.

If neither of those solutions helps I can see if I can look deeper and see if I can repro it.  There were some issues w/ IronPython 2.6 where this was really slow but they should have been fixed w/ 2.6.1.

From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Cory Brostowicz
Sent: Thursday, August 12, 2010 7:34 AM
To: users at lists.ironpython.com
Subject: [IronPython] ScriptScope.SetVariable() performance


I'm trying to get more performance out of my IronPython scripts inside one of my applications, and noticed I'm spending the bulk of my time setting up the ScriptScope prior to execution.  My applications translates information coming from a flat file, and I use IronPython to enforce business rules on various records that I pull from my input file.  The object that I'm passing to the scope is custom implementation of the ExpandoObject.

Am I doing anything out of the ordinary here, or is there a better way to get the performance I'm after?  It doesn't seem like setting up the script should performance significantly slower than executing the script itself.

Here is an example of the performance results I'm getting.  I'm keeping track of various timings for execution time, but the script setup timer is really just stopping and starting a stopwatch before and after each call to ScriptScope.SetVariable()...


Edit: SetProviderType           Count: 70291   Min: 9.927000E-001 Max: 4.922160E+001 Total: 7.656987E+004 Setup: 4.667084E+005
Edit: SetFeeSchedule            Count: 70291   Min: 1.572500E+000 Max: 6.547200E+001 Total: 1.067754E+005 Setup: 4.639014E+005
Edit: phDefaultNetworkCode      Count: 70291   Min: 1.900000E-002 Max: 2.413129E+002 Total: 1.618541E+003 Setup: 1.161743E+002
Edit: phCloneFieldList          Count: 70291   Min: 4.400000E-003 Max: 4.083400E+000 Total: 3.565259E+002 Setup: 1.113712E+002
Edit: phAssignValueToField      Count: 70291   Min: 9.700000E-003 Max: 1.777100E+000 Total: 5.765196E+002 Setup: 1.108866E+002

SetProviderType and SetFeeSchedule are both IronPython scripts, the other three are C# edits that I'm passing my ExpandoObject directly to.

4.667 E+005 = almost 8 minutes...
1.108 E+002 = .1 seconds

Thanks in advance for any advice you can help me with.


          class IronPythonScriptHost : PrimeEditBase {
                      ScriptSource mScriptSource;
                      ScriptEngine mEngine;
                      ScriptScope mScope;

                      public IronPythonScriptHost(string scriptText, string ScriptName, CommandLine mCommandLine, string[] mEditParms, ScriptEngine engine)
                                  : base(mCommandLine, mEditParms) {
                                  mEditName     = ScriptName;
                                  mIsScript     = true;
                                  mEngine       = engine;
                                  mScriptSource = mEngine.CreateScriptSourceFromString(scriptText, Microsoft.Scripting.SourceCodeKind.File);
                                  mScope = mEngine.CreateScope();
                      public override void SetupEdit(dynamic editScope) {

                                  mScope.SetVariable("PH", editScope);

                      public override void performEdit() {
                                  try {
                                  } catch (Exception ex) {
                                              ExceptionOperations ExcOps = mEngine.GetService<ExceptionOperations>();
                                              throw new Exception("Exception during execution of " + base.EditName + ". " + ex.Message + "\r\n" + ExcOps.FormatException(ex));
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