Please note that the Pywikipediabot developers have recently done some
work to reduce the memory usage. More caching is used as well as the
possibility to diskcache large dictionaries on disk instead of memory.
I suggest that you enable this cache using "use_diskcache = True" in
your user-config.py file.
Diskcache uses the cache directory in the pywikipedia folder. As the
home directories are on NFS it may be faster to make a symlink from
within your pywikipedia directory to /tmp:
rm -r cache
ln -s /tmp/your-username-cache cache
Please do not forget to update to the latest SVN version, especially
if you are using interwiki.py