[IronPython] Performance Issue

Dave Fugate dfugate at microsoft.com
Wed Nov 12 17:43:30 CET 2008

How does python.exe compare directly to ipy.exe?  That is, try running "date +%M:%S;ipy.exe interpolate.py;date +%M:%S" instead of using the DLR hosting APIs.


From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Wilfredo Lugo
Sent: Wednesday, November 12, 2008 8:32 AM
To: users at lists.ironpython.com
Subject: [IronPython] Performance Issue

Hi All,

I have a Python interpolation script which basically reads data from a file and perform a linear interpolation of the data present on the file.  I have been using this script for some time.  Right now I am working on a C# application that also performs linear interpolation, so I decided to use IronPython to call my script.  However, I am havving a huge performance difference from running the script on common python and running it on IronPython.

Here is an output of the following command using normal python (Cygwin under windows Vista):

$ date +%M:%S;python interpolate.py;date +%M:%S
WARNING: desired starting time (Tue Jan  1 00:00:21 2008) prior to time of first
 data point (Tue Jan  1 00:00:32 2008), current line: 9411
 series: 3D
force==False, exiting..

It basically took 4 seconds to complete.  Now if I run it on IronPython using VS and C# (Release mode) here is the output:

11/12/2008 12:16:34 PM
WARNING: desired starting time (Tue Jan 01 00:00:21 2008) prior to time of first
 data point (Tue Jan 01 00:00:32 2008), current line: 9411
 series: 3D
force==False, exiting..
11/12/2008 12:19:07 PM

The same script is taking more than 3 minutes and a half.

Here is the C# Code:
static void Main(string[] args)
            ScriptRuntime runtime = Python.CreateRuntime();
            ScriptEngine engine = Python.CreateEngine();
            ScriptSource source = engine.CreateScriptSourceFromFile("interpolate.py");
            ScriptScope scope = engine.CreateScope();
            Microsoft.Func<string, string, string, string, int, int> func = scope.GetVariable<Microsoft.Func<string, string, string, string, int, int>>("interpolate_start");
            Console.WriteLine(func("3-day-data.txt", "3-day-output.txt", "2008-01-01 00:00:21","2008-01-03 23:59:08",60).ToString());

I am using IronPython 2.0B5 and Visual Studio 2003 running on .Net3.0 Windows Vista.  The script and the C# code were run on the same machine.

If there is something I am doing wrong?  I really don't understand the performance difference.


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