Let start from your postgres configuration:
shared_buffers = 8192 <==== This is really too small for your configuration
sort_mem = 2048
wal_buffers = 128 <==== This is really too small for your configuration
effective_cache_size = 16000
change this values in:
shared_buffers = 50000 sort_mem = 16084
wal_buffers = 1500
effective_cache_size = 32000
to bump up the shm usage you have to configure your OS in order to be allowed to use that ammount of SHM.
This are the numbers that I feel good for your HW, the second step now is analyze your queries
These changes have yielded some visible improvements, with load averages rarely going over the anything noticeable. However, I do have a question on the matter, why do these values seem to be far higher then what a frequently pointed to document would indicate as necessary?
http://www.varlena.com/GeneralBits/Tidbits/perf.html
I am simply curious, as this clearly shows that my understanding of PostgreSQL is clearly lacking when it comes to tweaking for the hardware.
Martin Foster
Creator/Designer Ethereal Realms
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