[ python-Bugs-1010098 ] CPU usage shoots up with asyncore

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Bugs item #1010098, was opened at 2004-08-16 15:54
Message generated for change (Comment added) made by thomasabc
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 6
Submitted By: Thomas (thomasabc)
Assigned to: A.M. Kuchling (akuchling)
Summary: CPU usage shoots up with asyncore

Initial Comment:
The CPU usage of a python application program using 
asyncore.py shoot up to 99% under Python 2.4a1. After 
a comparison, it was found out that the same program 
ran without such high CPU usage under Python 2.3.3

A simple couple of programs to narrow down the problem 
showed that a single loop() was accompanied by a large 
number of poll() with 2.4a1, whereas a single loop() had 
only 3 calls to poll() with 2.3.3.

Please let me know if there is anything else I can do for 
you to analyse. A couple of python scripts are attached 
in a zip file for you as below:

- Summary of the test scripts

With these scripts, the test attempts to identify what 
function calls are called that might explain the high CPU 
usage observed.

asyncore_test.py:
Taken from the Python Library Reference 11.24.2 
asynchat Example, the test program starts a server 
process to simulate client request process.

http_test.py:
This program simply establishes connection to the server 
and closes after 10 seconds.

- Procedure

1. Start asyncore_test.py
2. Start http_test.py
3. Stop asyncore_test.py


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>Comment By: Thomas (thomasabc)
Date: 2004-08-20 10:05

Message:
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Sorry, just to let you know that you press Ctrl+C to stop the 
script above at Step 3 to get an output displayed as shown in 
the file asyncore_comparison.txt below.



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Comment By: Raymond Hettinger (rhettinger)
Date: 2004-08-19 17:29

Message:
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Andrew, what this due to your updates or was Martin's loop
counter the cause?

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