[Zope-dev] still segfaults, this time no ZMySQLDA

[Matthew T. Kromer]

Leonardo Rochael Almeida wrote:

>On Tue, 2002-02-26 at 21:55, Matthew T. Kromer wrote:
>
>>in lib/python/Products/PythonScripts/PythonScripts.py, try changing 
>>Script_magic to be 4, and see if that helps.
>>
>
>Nope, time between restart after the change and 1st crash was aprox.
>3m15s.
>

Rats!  I was hoping that would flush things out, but wasn't expecting it 
to work.

>>FYI, some of this is written up in
>>
>>  http://www.zope.org/Members/matt/StabilityHOWTO
>>
>
>hmm, I didn't know that page. It mentions trying with the -t 1. In this
>case, what is the real total number of threads? is it one for Medusa and
>one for handling Zope requests or is it just one overall? In this case I
>might be able to run it under Valgrind after all.
>
>Should I bother trying a different ExtensionClass.h?
>
>Cheers, Leo
>

With -t 1, you're still running with more than one real thread, but only 
1 worker thread is processing Zope requests.  Most of the time when 
there is a threading issue, the worker Zope threads are the ones that do 
the potentially thread-unsafe work, so running with -t 1 will prevent a 
thread switch from occurring while an exposure could take place.

You don't need to bother with the different ExtensionClass.h; the magic 
in my special version is NOT necessary to apply, and should not make 
your system any more stable.

-- 
Matt Kromer
Zope Corporation  http://www.zope.com/