effective_cache_size v824

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Hi,

I'm playing around with the effective cache size setting today.  Someone recommended the formula
((buffers + cached ) / 8 ) during heavy querying to optimize the 'Postgresql.conf' setting.

I have 4 separate physical servers and I have all of them set to 512 MB, even though the results of the formula show.

Server 1     1 GB
Server 2     1 GB
Server 3     2 GB
Server 4     2 GB


These results indicate that I should raise my effective_cache_size on all the servers.   My shared buffers settings are all 256 MB.
Does it matter that I have 2 instances running on each of these servers?  IOW, should I divide the results in half, one for each instance and go with this as the recommended effective_cache_size setting instead?

Server 1     512 MB
Server 2     512 MB
Server 3     1 GB
Server 4     1 GB


Thanks for any insight,
~DjK



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