So I read quite a few things about this phenomenon in Python 2.4.x but
I can hardly believe that there is really no solution to my problem.

We use a commercial tool that has a macro functionality. These macros
are written in python. So far nothing extraordinary.

Our (python-)macro uses massively nested loops which are unfortunately
necessary. These loops perform complex calculations in this commercial
tool. To give you a quick overview how long this macros runs:

The outer loop takes 5-7 hours for one cycle. Each cycle creates one
outputfile. So we would like to perform 3-5 outer cycles en bloc.
Unfortunately one of our computers (768MB RAM) crashes after just ~10%
of the first cycle with the following error message:

http://img2.freeimagehosting.net/uploads/7157b1dd7e.jpg

while another computer (1GB RAM) crashes after ~10% of the fourth
loop. While the virtual memory on the 1gb machine was full to the
limit when it crashed the memory usage of the 768mb machine looked
this this:

http://img2.freeimagehosting.net/uploads/dd15127b7a.jpg

The moment I close the application that launched the macro, my
ressources get freed.

So is there a way to free my memory inside my nested loops?

thanks in advance,
tim

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