[Zope] Active Zope threads and connection cache size

[Dennis Allison]

Does the size of the connection cache need to grow when Zope runs more
threads.  I currently am running 8 threads (default 4).  I note that the
current OODB  connection cache size is FIXED at 7.  Do I need to increase
the size?  I would have guessed the connection cache should be somewhat
larger than the number of threads and that it should be set dynamically.
Can anyone hazard a guess as to what it should be?  twice the number of 
threads? more?

I am running Zope 2.6.3b2 but I think the same question is relevant for
all versions of Zope.