Maximum number of processes for the report service ,batch report service

[cognos05]

Hi ,

We have a single installation cognos server and the the server which we use has 16 cpu ( '2 quadcore processor with 48 gb memory )

I would like to know what value should i set for

Maximum number of processes for the report service during peak period -
Maximum number of processes for the batch report service  during peak period -
Maximum number of processes for the report service during non peak period -
Maximum number of processes for the batch report service  during non peak period -

Also can any one explain what does low affinity and high affinity settings do .

Thanks,