[IronPython] performance hit on 64 bit systems

Idan Zaltzberg idan at cloudshare.com
Fri Sep 3 12:42:43 CEST 2010

Using ipy64 gave better results of 14.8 sec but still not as good as the 32

I did do the ngen but Im not sure I did properly.

BTW, my real application is hosted on .net application, does ngen affect me
in this case?

*From:* users-bounces at lists.ironpython.com [mailto:
users-bounces at lists.ironpython.com] *On Behalf Of *Lukas Cenovsky
*Sent:* Friday, September 03, 2010 1:17 PM
*To:* Discussion of IronPython
*Subject:* Re: [IronPython] performance hit on 64 bit systems

Wild guess:
 - do you run 64-bit IronPython on 2008 R2?
 - did you NGEN 64-bit IronPython and the app?

-- Lukáš

On 3.9.2010 12:04, Idan Zaltzberg wrote:


I'm trying to migrate a big  application (running on IronPython 2.6.1) from
a 32 bit OS (windows server 2003 R2) to a 64 bit system (windows server 2008

I have noticed about 50% performance hit, i.e. operations that took 10
seconds, now take 15 seconds.

I have tried to see the what is the root cause and created the following
test, and ran it on both systems:

def f():



     for x in xrange(n):

            s='string:%s' % (x,)

     print sw.Elapsed.TotalSeconds

from System.Diagnostics import Stopwatch

sw = Stopwatch()

n = 1e7


è *11.7766457 (In windows server 2003 R2 – 32 bit)*

è *16.3231212 (In windows server 2008 R2 – 64 bit)*

* *

Which matches the about 50% loss I have seen on my system.

On the other hand, the equivalent code in cpython yields *slightly better
results to the 64 bit OS*  (3.7 sec to the 64 bit, against 4.1 sec to the 32

I hoped you might help to understand why this as happened and can I improve
the performance in any way for 64 bit systems.



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