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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It’s a great time to bring this up because I’m currently investigating
various start-up time issues and trying to improve our startup time. I’ll give
you a breakdown of what I’ve discovered so far:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> Various reflection that we do over types:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> This includes over modules
(SystemState, built-ins, re, etc…)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> Over types for creating “DynamicType”s:
object, string, PythonFile, etc… - these are the types we need to startup and
display the logo.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> JITing methods: <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> Not on hello world, but on a
more complex scenario, I know we JIT 2500 methods on startup on the desktop CLR
(this is loading the Python version of the chess API shown at MIX – but not
actually running it). Obviously that’s going to take some time too. W/o an
ngen’s mscorlib we’ll JIT something like 4000 methods.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There’s also some little things here and there but my numbers
show JITing is representing around 70% of our startup time. Being as fast as
CPython might be tough but we certainly want to do better than where we are.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
users-bounces@lists.ironpython.com [mailto:users-bounces@lists.ironpython.com] <b>On
Behalf Of </b>C L<br>
<b>Sent:</b> Tuesday, July 17, 2007 2:10 AM<br>
<b>To:</b> users@lists.ironpython.com<br>
<b>Subject:</b> [IronPython] IronPython Start-up Time<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Hello,<br>
<br>
playing around a bit with IronPython I noticed that the start-up time is<br>
quite long<br>
<br>
Something around ~12s for the initial launch and around ~3,5s for each
following<br>
launch executing <br>
----<br>
import sys <br>
sys.exit(0)<br>
----<br>
with IronPython-2.0A2\ipy.exe (on a Core Duo 2Ghz 2GB)<br>
<br>
I am not complaining, just curious.<br>
Is this simply because loading the CLR/DLR takes so much time?<br>
And what is with the 3.5s for successive start-ups?<br>
<br>
For comparison CPython needs ~2s for the initial and<br>
~0.2s for successive start-ups.<br>
<br>
Regards,<br>
Claudius<br>
<br>
Btw I used the simple C++ program <br>
----<br>
// Compile with<br>
// cl /Feuxtime.exe /EHsc uxtime.cpp<br>
//<br>
// uxtime.exe "PATH_TO_IronPython\ipy.exe
simplyExit.py"<br>
// <br>
#include <stdio.h><br>
#include <ctime><br>
#include <stdlib.h > <br>
<br>
int main( int argc, char**argv)<br>
{<br>
int c_start = clock();<br>
system( argv[1]);<br>
int c_end = clock(); <br>
printf("%d\n", ((double)(c_end - c_start)) /
CLOCKS_PER_SEC );<br>
}<br>
----<o:p></o:p></p>
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