Benchmarking PostgreSQL

Hi all,

I'm looking to run some benchmarks of PostgreSQL on some of the Linux systems 
here.  They're running PostgreSQL 7.0.3, and I've compiled and installed 
PostgreSQL 7.1RC4 on one as well.

Does anyone have suggestions for the best way to do benchmarks (even of a 
limited scale) on these systems, so I can at least determine what the optimum 
buffer sizes are, etc?

As an aside, did anyone ever step up to create a TPC-C benchmark suite for 
PostgreSQL?

If no-one else has, I will start to.

Regards and best wishes,

Justin Clift