Tom,

> Well, if the load is a lot of short writing transactions then you'd
> expect the throughput to depend on how fast stuff can be pushed down to
> WAL.  What have you got wal_buffers set to?  Are you using a commit
> delay?  What's the I/O system anyway (any BB write cache on the WAL
> disk?) and what wal sync method are you using?

You know, I think Jignesh needs to me on this list so I can stop relaying 
questions on a workload I didn't design.  Let me get him.

-- 
Josh Berkus
PostgreSQL @ Sun
San Francisco

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