>Interesting. One complication with that scheme is that ther is no
>convenient place to put caching. If it goes between Pen and Zope, you
>need many instances of your cache. If it goes between Pen and the
>clients, Pen's client-clustering is defeated because it sees only one
>client.

Postgresql takes a similar (multi process) approach to achieving stability
as apache.

see pg 4 of http://developer.postgresql.org/pdf/transactions.pdf

Think shared memory caching behind the Zope worker processes ;-)

And web server / proxy shared memory caching in front of the Zope worker
processes.

Of course, for stability, there is also the possibility of doing a OpenBSD
style audit of the entire Zope (and possibly python) code base to make
the code as close to perfect (and therefore stable) as the OpenBSD OS
  is ;-)   Volunteers?

Adam


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