[ZODB-Dev] Running Zope and ZEO server in one process?

[Gfeller Martin]

Dear Zopistas and ZEOxperts,

In our application, we have lots of standard tasks for which 
one Zope server is adequate, and a few long-running analysis 
tasks which we would like to delegate to another process, 
mainly to take advantage of multiple-CPU machines.

The delegated analysis tasks would only need read-only access 
to (a number of) ZODB databases, while the standard tasks 
modify the databases.

I fear that a standard ZEO setup with one storage server, a 
read-write client, and a number of read-only client would slow 
down affairs for the main Zope tasks, as there are quite a 
number of writes (no problem with a single server). Furthermore, 
it would probably increase memory requirements, as both the 
Storage Server and the Zope Servers would need substantial caches.

Is there a way to run the ZEO server protocol in the main Zope 
server, i.e., have a single process that is both a Zope server 
and serves other ZEO clients? Are there other routes I should try? 
I have also tried to simply open the ZODB DBs read-only from 
another process, but that doesn't give me the updates to the 
objects after the initial open.

Thank you, and best regards,
Martin Gfeller

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