[IronPython] Why is IronPython so much slower to import modules when built as an exe then as a script?

[Dino Viehland]

The only thing I can think of is if you're on a 64-bit OS then ipy.exe is a 32-bit
EXE and the EXE you compiled is platform neutral - so it'll load on the 64-bit CLR.

If that's the case you could use pyc.py with /platform:x86 and you should get the 
same behavior as ipy.exe.

Other than that I'm not sure what would cause this - I get the same times on my
(32-bit) laptop when running:

Measure-Command { & '.\ipy.exe' .\time.py }
	And
Measure-Command { & .\time.exe }

>From powershell.

> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-
> bounces at lists.ironpython.com] On Behalf Of Doug Warren
> Sent: Wednesday, September 01, 2010 11:11 AM
> To: Users at lists.ironpython.com
> Subject: [IronPython] Why is IronPython so much slower to import
> modules when built as an exe then as a script?
> 
> I wrote a small script for work and when developing it everything was
> fine but
> when I turned it over for production use people complained about the
> time it
> took to display the first form.  Looking into it, all the time seemed
> to be
> spent in importing various modules used by the script.  I made a new
> script
> of just the import statements and a print Hello World and then ran it
> both as
> a python script and an executable with the results below.  What's going
> on and
> is there any way to speed this up?
> 
> 
> Python file:
> $ for i in {1..10}
> > do
> >   time ./ipy.exe time.py
> > done
> real    0m1.712s
> real    0m1.701s
> real    0m1.689s
> real    0m1.691s
> real    0m1.709s
> real    0m1.663s
> real    0m1.697s
> real    0m1.700s
> real    0m1.699s
> real    0m1.741s
> 
> exe built with ipy pyc.py /main:time.py /target:exe
> $ for i in {1..10}
> > do
> >   time ./time.exe | grep -v user | grep -v sys
> > done
> real    0m22.119s
> real    0m22.116s
> real    0m22.133s
> real    0m21.816s
> real    0m21.985s
> real    0m21.785s
> real    0m22.010s
> real    0m21.686s
> real    0m21.877s
> real    0m21.944s
> 
> contents of time.py:
> import clr
> from clr import AddReference
> AddReference("System.Windows.Forms")
> AddReference("System.Drawing")
> AddReference("p4api")
> import cgi
> from System.Diagnostics import Process
> from P4API import *
> import System
> from System import *
> from System.Windows.Forms import *
> from System.ComponentModel import *
> from System.Drawing import *
> from System.Threading import *
> import re
> import urllib
> import os
> import tokenize
> from cStringIO import StringIO
> from optparse import OptionParser
> import os
> import urllib
> import ntpath
> import stat
> import genericpath
> import warnings
> import linecache
> import types
> import UserDict
> import _abcoll
> import abc
> import textwrap
> import string
> import urlparse
> import collections
> import keyword
> import nturl2path
> import mimetools
> import tempfile
> import random
> import __future__
> import rfc822
> import tokenize
> import token
> import codecs
> import ConfigParser
> import uuid
> import sys
> 
> print "Hello World"
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