[mod_python] extreme memory usage with apache2

Nicolas Lehuen nicolas.lehuen at gmail.com
Wed Sep 14 01:53:31 EDT 2005

There is a possibility that you've ran into a known memory leak that is 
fixed is the 3.2 beta version of mod_python, but still present in the
3.1.4version. If your webObject instance stores something into the req
which points back to the webObject instance, bam, you've created a reference 
cycle which won't be garbage collected in 3.1.4 (but will be in 3.2).

Here is the issue in our bug tracking system :



2005/9/13, mauchi <mauchi_co at earthlink.net>:
> I've noticed this behaviour as of late which causes large memory usage in 
> apache2, rogue threads taking up 400+ megs for each client that eventually 
> cause me to restart apache:
> I return all html content through a python object which handles the form 
> data and tracks errors
> # Init object and parse form
> response = webObject(req)
> # return html or xml based on form entries
> req.write(response.returnSomething())
> # print debugging information
> req.write(response.returnErrors())
> the object has an internal array called errors where I store debugging 
> information from the internal functions. What I expect is 1-2 lines of 
> messages for each time the page is loaded which is printed at the bottom of 
> the page. What I find is if I keep hitting refresh, that the lines grow each 
> time with the previous load's messages. 50 refreshes later I'll have 50-100 
> lines of debugging information. This makes me think that the webObject is 
> staying in memory between loads and doesn't get destroyed until I restart 
> apache2. This has become more of a problem as each client page now requests 
> frequent xml updates and the server quickly tires out.
> If anyone has a suggestion on how to either: turn off said behaviour in 
> mod_python, destroy objects from memory, or a clever way to flush out all of 
> an object's internal data between loads, I would be most happy.
> Thanks to all in advance!
> Mauchi 
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