Dear all,
I'm running a large Zope application on a 1x1GHz CPU 1GB mem
Window XP Prof machine using Zope 2.7.3 and Py 2.3.4
The application typically builds large lists by appending
and extending them.
We regularly observed that using a given functionality a
second time using the same process was much slower (50%)
than when it ran the first time after startup.
This behavior greatly improved with Python 2.3 (thanks
to the improved Python object allocator, I presume).
Nevertheless, I tried to convert the heap used by Python
to a Windows Low Fragmentation Heap (available on XP
and 2003 Server). This improved the overall run time
of a typical CPU-intensive report by about 15%
(overall run time is in the 5 minutes range), with the
same memory consumption.
I consider 15% significant enough to let you know about it.
For information about the Low Fragmentation Heap, see
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/memory/base/low_fragmentation_heap.asp
Best regards,
Martin
PS: Since I don't speak C, I used ctypes to convert all
heaps in the process to LFH (I don't know how to determine
which one is the C heap).
________________________
COMIT AG
Risk Management Systems
Pflanzschulstrasse 7
CH-8004 Zürich
Telefon +41 (44) 1 298 92 84
http://www.comit.ch
http://www.quantax.com - Quantax Trading and Risk System
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4