[Zope] Re: Zope hanging (poss. threads-related)

[Dr. Ross Lazarus]

No doubt about it. 

A number of users have reported serious stability problems - me
included. Apache/FCGI or direct to medusa seems to make no difference.
One way of stopping the problem is to run with -t 1 but frankly, it's
not a viable option for many situations - single threading zope is
painful under any kind of load, but at least it doesn't appear to core
dump regularly.

I've experienced it on a 2.1.6 binary install on a linux (stock RH6.1)
box but I understand it's been reported on a solaris x86 box also. I
have a lightly loaded sunos 5.6 binary install which seems stable.

The stability with single threading seems to point to a thread problem
and the possibility of a libc bug has been rumored. 

--- In zope@egroups.com, Marcus Collins <mcollins@s...>  wrote:
>  Apologies for the imposing subject line...
> 
> Briefly, since increasing the NUMBER_OF_THREADS that Zope uses from the
> default (4) to 20, Zope has been hanging randomly. A request will be sent
> off to Zope (whether through apache with mod_pcgi, or directly through
> ZServer), but the request is never served up, and Z2.log shows no record of
> it. No additional CPU is taken by the python process.
> 
> Environment:
>  Zope 2.1.3 (source release)
>  python 1.5.2
>  GCC 2.7.2.3
>  FreeBSD 3.3-RELEASE
> 
-- 

Dr Ross Lazarus
Associate Professor and Sub-Dean for Information Technology
Faculty of Medicine, Room 126A, A27, University of Sydney,
Camperdown, NSW 2006, Australia
Tel: (+61 2) 93514429   Mobile: +61414872482  
Fax: (+61 2) 93516646   Email: rossl@med.usyd.edu.au