"Michael Paesold" <mpaesold(at)gmx(dot)at> writes:
> Is there currently debug output in the code that could tell me answers to
> those questions?
There is some debug output available from the ARC code,
but I dunno if its output is actually useful ;-). Try
http://developer.postgresql.org/docs/postgres/runtime-config.html#GUC-DEBUG-SHARED-BUFFERS
regards, tom lane