Nico Grubert wrote:
Dear list members,

I am running Zope 2.9.6. on a 64-Bit Suse Linux 10.1 machine (9 Gbyte of RAM) with Python 2.4.3. installed. From time to time, Zope hangs and I cannot access it anymore. I tried to use the "Zope DeadlockDebugger" but if my Zope hangs I cannot call the URL "http://myzopesite:8080/manage_debug_threads?secret_password"; to let Zope DeadlockDebugger show any useful information. Zope does not response. If Zope hangs, the python process eats all the memory and the machine starts to swap.

The "top" command in the shell tells me: -------------------------------------------------------------------------
Tasks:  91 total,   2 running,  89 sleeping,   0 stopped,   0 zombie
Cpu(s): 10.4%us,  0.4%sy,  0.0%ni, 89.0%id,  0.2%wa,  0.0%hi,  0.0%si
Mem:   9041256k total,  9025124k used,    16132k free,    10604k buffers
Swap:  4208988k total,  4208988k used,        0k free,     9472k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
29992 wwwrun    16   0 12.0g 8.3g 2860 S   19 95.9   3:52.66 python
-------------------------------------------------------------------------

There are several add-ons for Zope installed, like:
 - "Psycopg" Postgres Database Adapter
 - "mxODBCDA" ODBC Database Adapter
 - LDAPUserfolder
 - "Silva" Content Management System
 - PIL

Furthermore, I see a lot of Conflict Errors in the "event.log" like e.g.:
-------------------------------------------------------------------------
ZPublisher.Conflict ConflictError at /VirtualHostBase/http/193.134.202.20:80/mysite/VirtualHostRoot/: database conflict error (oid 0x0435, class BTrees._OOBTree.OOBTree, serial this txn started with 0x036aeb14ab1c4b88 2007-01-15 12:04:40.104030, serial currently committed 0x036aeb1d0cc5d099 2007-01-15 12:13:02.993605) (80 conflicts (0 unresolved) since startup at Mon Jan 15 11:44:55 2007)
-------------------------------------------------------------------------

These kind of Conflict errors occur almost every minute.
It might be that these errors have something to do with it but I am not sure.

How can I figure out what exactly causes Zope to hang?
If you need more information, please let me know.

Have you tried to enable the trace logger in the zope.conf file?
Look for the stanza beginning with <logger trace>.

You need to have your server in debug-mode. This will produce a
trace.log file that can be analyzed with requestprofiler.py.

This will give you the offending requests that caused Zope to hang.

Suresh


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