Are there any metrics about how to set the ZODB 'cache-size' (or 
cache-size-bytes) option? We've been using '5000' (arbitrarily chosen) for our 
Zope 3.4-ish app servers. We have access to zc.z3monitor which can output the 
"number of objects in the object caches (combined)" and "number of non-ghost 
objects in the object caches (combined)".

But I don't know understand how to interpret those numbers and use them to make 
better settings.

Jeff Shell

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