Hello, I found refences to similar problems in the archives, and was wondering if any progress was made as to possible causes and solutions. The system: Zope 2.6.1 CMF 1.3 Apache 1.3 + mod_rewrite + mod_proxy The symptoms: Zope stops responding to HTTP requests Zope memory usage increases suddenly quite a bit The number of apache processes increases quite a bit also Can't kill Zope normally, need to do a -9 ... Once I restart it , all is back to normal. This happens once a week, sometimes more. As I saw in the archives, this would be due to a locking problem inside zope? One thing to note is that our site is 99% read-only, very few writes happen during a day, since we use the CMF features only for internal authoring of your site. I'd think this "locking" issue would be a problem when there's a read/write conflict, so I'm surprised to see it happen so often for us. Is my thinking flawed? On the other hand we might experience it a lot because of the high volume of traffic? Also, I use -t 5 ... I recall there was another value, in the code, one should change (ZODB connection pooling if I recall?) ... I haven't done that, so I'm going to go read up on that, but I'm wondering if these 2 values not playing nice with each other could be a cause of such behavior? I'll try wunnning the default 4 threads for a while too, see if that helps. Dieter, if you're reading this, you had mentionned you guys were also experiencing this ... Had a chance to look at it yet? Thanks, Jean-François Doyon Internet Service Development and Systems Support / Soutien de systèmes et developement de services Internet GeoAccess Division / Division GéoAccès Canada Center for Remote Sensing / Centre canadien de télédétection Natural Resources Canada / Ressources naturelles Canada Phone / Téléphone: (613) 992-4902 Fax / Télécopieur: (613) 947-2410 http://atlas.gc.ca