[Zope] Zope memory usage out of control

[Navindra Umanee]

Hi!

First of all let me just say what a wonderful system Zope is.  We've
been running dot.kde.org on a Squishdot/Zope setup very successfully
for a quite a while now.

Unfortunately, the admin of the server is getting a bit edgy about the
increasing memory usage of Zope and is pressing for action.  From the
very start we've had to restart Zope daily (with a cron job) because
Zope would be using large amounts of memory after several hours.

After 15 hours of uptime this is the current situation as reported by
top:

  PID USER     PRI  NI  SIZE  RSS SHARE STAT  LIB %CPU %MEM   TIME COMMAND
12093 zope       0   0 94988  90M   796 S       0  0.7 11.9   9:01 python
12122 zope       0   0 94988  90M   796 S       0  0.0 11.9   0:03 python
12123 zope       0   0 94988  90M   796 S       0  0.3 11.9  32:56 python
12124 zope       4   0 94988  90M   796 S       0 15.4 11.9  33:06 python
12125 zope       0   0 94988  90M   796 S       0  0.0 11.9  33:10 python
12126 zope       0   0 94988  90M   796 S       0  0.0 11.9  36:52 python

Please tell me that's really a single process with several threads all
sharing memory? :-)

dot.kde.org is certainly a very busy site, is this the kind of memory
usage to be expected from Zope?  Has anyone seen this kind of problem
before?

We're using Zope 2.2.1 with the hotfixes on a Red Hat Linux box. 

Any hints short of switching to another news system appreciated (the
SlashCode guys have been on our case). ;)

Thanks,
Navin.

PS I'm not sure if my confirmation of subscription worked or not,
   please Cc:  navindra@cs.mcgill.ca meanwhile, otherwise I'll just
   check the archives.