[Zope] Re: Zope hanging (poss. threads-related)
Dr. Ross Lazarus
rossl@med.usyd.edu.au
Tue, 11 Apr 2000 08:13:24 +1000
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