[Zope] Zope Performance with Multiple Mount Points

Andreas Jung lists at zopyx.com
Mon Apr 12 12:04:40 EDT 2010

Hash: SHA1

Brian Brinegar wrote:
> We've recently moved to a Zope configuration with approximately 30
> separate databases mounted at mount points within a main database.
> Previously, we ran a single database which was approaching 300GB in
> size. We chose to split the database to reduce Data.fs size. We now run
> 30 separate ZEO Servers (on a single machine).
> However, after switching to this configuration we've noticed some
> performance issues.
> Initially, after a client is restarted and builds out it's caches the
> site runs very quickly. However as the memory usage grows the
> performance degrades. If the client gets into swap the client
> practically dies.
> We had 10,000 object caches on each of the databases with 2 threads on
> the client. 30 x 10,000 x 2 = 600,000 objects in memory. We've since
> reduced the cache sizes to 1,000 or 30 x 1,000 x 2 = 60,000 objects.
> This seemed to extend the life of a client between restarts.

No idea what's running onside your system and inside your Zope - 1000
objects seems way to small for almost any case. Also 30 ZEO servers
seems kind of extreme. We are running similar a big applications and we
are running with five or six ZEO servers - not 30.

- -aj

> Generally, our client machines will hover around 97%-99% memory usage
> and 90%-100% CPU (on a 2 CPU machine).
> We still experience periodic performance problems and are looking for
> any input that might help us address them.
> Thanks for your input,

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