Chris Browne wrote:
It was a little troublesome inducing it. I did so by cutting
shared memory to minimum (128kB)...
With higher shared memory, I couldn't readily induce compaction,
which is probably a concurrency matter of not having enough volume
of concurrent work going on.
Quite. It's taken me 12 days of machine time running pgbench to find
the spots where this problem occurs on a system with a reasonably sized
shared_buffers (I'm testing against 256MB). It's one of those things
it's hard to reproduce with test data.
Thanks for the thorough code review. I've got a clear test plan I'm
progressing through this week to beat on the performance measurement
aspects of the patch.
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Greg Smith 2ndQuadrant US g...@2ndquadrant.com Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.us
"PostgreSQL 9.0 High Performance": http://www.2ndQuadrant.com/books
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