I have a small multithreaded script running in django and over time its starts using more and more memory. Leaving it for a full day eats about 6GB of RAM and I start to swa
I think you should use different tools. Apparently, the statistics you got is only about GC objects (i.e. objects which may participate in cycles); most notably, it lacks strings.
I recommend to use Pympler; this should provide you with more detailed statistics.