Logic of this option is under following.
1. execute cluster command to sort records.
2. execute checkpoint to clear dirty-buffers in shared_buffers.
3. execute sync command to clear dirty-file-caches in OS.
4. waiting 10 seconds for raid cache is until empty .
5. execute checkpoint to init checkpoint_timeout and checkpoint_segments.
6. start benchmark.
I have similar logic in some of my benchmarking scripts but I don't
see a compelling reason to include it in pgbench itself.
I agree that this looks more like script material.
However I think that part of this interesting checklist and discussion
could make it to some "caveat" section about reproducible performance
measures in pgbench documentation, though?
--
Fabien.
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