[Zope] Multithreading sessions

Jon Emmons jon.emmons at earthwavetech.com
Wed May 28 09:23:09 EDT 2008


Thanks for your input.

Unfortunately, I am out of the office this week.  When I return I will be
trying to resolve this issue.

I don't believe it has squat to do with my Database at all, so I will be
setting up some scenarios where I am making simultaneous requests, requiring
no DB access.

I will echo the data to my screen, hopefully I will see an interwoven jumble
of characters as my web server is sending text "simultaneously" to multiple

If I don't see an interwoven jumble of stuff representing the various
threads, then my problem is more fundamental than DB contention.

I appreciate everyone's help.

Jon Emmons

On Fri, May 23, 2008 at 1:55 PM, Andreas Jung <lists at zopyx.com> wrote:

> --On 23. Mai 2008 12:31:50 -0500 Jens Vagelpohl <jens at dataflake.org>
> wrote:
>> On May 23, 2008, at 11:49 , Jon Emmons wrote:
>>> Another thought I had, is that Zope has only one python interpreter
>>> running,
>>> pretty much forcing all processing to be serial by default given
>>> what you've
>>> just said.
>> Sorry, that's all baloney. Just like blindly hiking the number of threads
>> or the ZODB database connection pool size. Zope can handle more than one
>> concurrent request.
>> I would take a close look at the Zope database adapter for your
>> relational database you are using. Some are not thread-enabled and will
>> serialize database access.
> Not much to be added. Either your backend server blocks further requests
> (as indicated earlier by a database lock) or some extension module is
> holding the GIL. We have seen situation where Python did not perform a
> thread switch while working on a complex regular expression operation in one
> thread (preventing a thread switch over ten seconds and longer).
> Andreas
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