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:
Hello,
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 R2).
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():
sw.Reset()
sw.Start()
for x in xrange(n):
s='string:%s' % (x,)
print sw.Elapsed.TotalSeconds
from System.Diagnostics import Stopwatch
sw = Stopwatch()
n = 1e7
f()
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 bit).
I hoped you might help to understand why this as happened and can I
improve the performance in any way for 64 bit systems.
Thanks.
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