To quickly find out a subset of slow queries on your production system, you
can use the pgfouine tool:
  http://pgfouine.projects.postgresql.org/

If you then want to make some measurements of PostgreSQL performances with
some different settings and compare them, consider using the tsung tool (and
may be tsung-ploter companion tool to graph several benchs onto the same
charts for comparing purpose):
  http://pgfouine.projects.postgresql.org/tsung.html
  http://tsung.erlang-projects.org/
  http://debian.dalibo.org/unstable/

Thanks for all the links!  I'll check these out when I get back to work.

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