[Zope] Zope threads dying continuosly

[Tim Edwards]

Hmmm... I'll try and explain a bit more about our problems. We found Zope to
be generally unstable in that, after a few mins up to an hour or so, Zope
would sometimes freeze. Also when multiple people were accessing a Zope
application that retreives or modifies data in our MS SQL Server database
the Zope server would freeze and have to be restarted - always, not just
some of the time.

After installing a glibc update for Red Hat 9 that fixes a problem with
Python programs not being able to create threads and specifying the -t
option in the Zope start script (yes with 500 threads!) it seemed a lot more
stable. Now multiple people can use our database access application without
it crashing. As for the 500 threads I have now put it down to 9, however it
doesnt seem to make that much of a difference in resources - a ps listing
tells us we only ever have the normal 2 z2.py processes open at a time.

I am now running the Zope server in debug mode on a terminal and can see
that it occaisionally crashes and automatically restarts iteself. Also if I
go into the management interface and click on a ZSQL method it crashes - and
then restarts itself. Applications that use those methods still seem to work
for some reason. However I cannot get to the management interface page for
any ZSQL method in the whole Zope installation.

Thanks


-----Original Message-----
From: Dylan Reinhardt [mailto:zope at dylanreinhardt.com]
Sent: Friday, 21 November 2003 4:16 PM
To: Tim Edwards
Cc: 'Zope at zope.org'
Subject: RE: [Zope] Zope threads dying continuosly


On Thu, 2003-11-20 at 18:15, Tim Edwards wrote:
> Thanks for your replies, the original reason I asked is that we are having
> stability issues with Zope.

Such as...?

>  I have tried it without the demon process, but
> that doesn't appear to help. I then reenabled the demon process and
changed
> the thread count to 500 

500 is a huge number of threads.  You should probably stick with single
digits until you have a well-formed case for doing otherwise.

HTH,

Dylan