HI Jan

Something to watch for on the memory front, is if you are doing a lot of 
string manipulation
using '+' operator.  I have seen someone here last year using + rather than 
join and 
hitting soft and hard memory limits with a single request, and changing to 
join reduced 
memory use by 100 times.  Its an extreme example I know.

Also if you are holding references to entities in modules, global, etc... 
things may not get garbage collected.

Have a look at apptrace http://pypi.python.org/pypi/apptrace/0.2.3  which 
allows you to monitor memory use in appengine

Rgds

T

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