All, I also am having severe problems with memory creep. Our problem exhibits itself by quickly using gobs of memory and requiring a zope restart after about a day and a half at about 100M resident. First our configuration: Core Components: FreeBSD 4.0/FreeBSD 3.4 - on separate machines of course Postgres 6.5.3/Postgres 7.0(fixes some memory leaks) Python 1.5.2 Zope 2.1.4/2.1.6 have tried both pcgi with ZServer Apache w/mod_ssl 1.3.9 and 1.3.12 Products: ZPySQLDA SQLSession GenericUserFolder I have looked at a lot of different things. This includes: Installing the gc(garbage collection) python package - Neil Schemenauer's patches Installing Postgres 7.0(fixes some connection memory leaks) Tracking the cache cleanup inside zope Tracking thread locking inside DB.py, Transaction.py Results: gc python didn't help alleviate the problem Postgres 7.0 instead of 6.5.3 didn't help the problem I do see GenericUserFolder and SQLSession objects with the Control_Panel_Debug screen, and they do not seem to go away. I wrote a simple python script to do nothing more than authenticate (log in) using the GenericUserFolder method docLogin. The memory usage quickly grows out of control. After waiting 15 minutes(my cookie timeout), no decrease in memory usage. The objects are still in the cache also. Restarting zope clears everything up, and starts out nice and clean again. We have a cron job doing this right now. Questions: 1. How does a user's connection resources etc. get cleaned up by Zope after a cookie timeout? Do I need to do this myself? 2. How does a genericuserfolder's set of objects used by an authenticated user get cleaned up. I can't seem to make those objects get reclaimed by the system, even when the user logs off? 3. I am not explicitly removing SQLSession objects. Will my usage counts for these objects remain > 1, thereby never allowing them to get cleaned up, and thereby keeping my usage counts for genericuserfolder's > 1? 4. Since GenericUserFolder inherits from Folder objects, is it possible that the reason my memory grows so fast is that Zope does not release the resources used by a user properly, during an abrupt disconnect? I will assist/help trying different things to try to solve this problem! thanks. eric.