[Zope] Counting threads

Jens Vagelpohl jens at dataflake.org
Tue Jan 22 17:45:24 EST 2008

On Jan 22, 2008, at 23:33 , Peter Bengtsson wrote:

> On 22/01/2008, Dieter Maurer <dieter at handshake.de> wrote:
>> Peter Bengtsson wrote at 2008-1-22 15:23 +0000:
>>> Perhaps I'm wrong but I suspect that a Zope I'm running is dying  
>>> because
>>> of running out of threads.
>> This is very unlikely. It may no longer respond when all its threads
>> are working -- but it will not die for this reason.
> By dying I don't mean crashing and stopping but instead staying up and
> running but not responding to anything. Like a coma.

This symptom, especially when these "hanging" threads cause no load at  
all on the system, certainly point to connections to outside systems  
that do not respond for some reason. I have seen this issue with Zope  
instances that make HTTP calls to other systems, or even with a  
hanging LDAP server which accepted connections from Zope but never  
returned. Any software that makes outgoing network connections from  
Zope is a potential suspect.

GDB can help you determine where the hanging condition originates.  
Here's some links:




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