[Zope] understanding Zope's memory usage

[Lucas Hofman]

I am running a server with a handfull of plone intranet sites. The 
server has 4GB  memory, but is now starting to page.

What I notice is that the different Plone instances vary widely in there 
memory usage. For one site every process uses 400Mb, and there are 6 
processes running! That is 2.4 Gbyte for one site!

I see there is one deamon process that is small, and 6 processes that 
are big. If we call the six biggies a-f:
deamon start a
a starts b
b starts c d e f

c d e f are probably zserver threads, but what do process a and b? And 
why do the all have the same size and RSS? What are the alternatives to 
limit the memory consumption?

Anybody who can enlighten me on this?

Thanks, Lucas