On 2016-04-14 07:59:07 +0530, Amit Kapila wrote:
> What you want to see by prewarming?

Prewarming appears to greatly reduce the per-run variance on that
machine, making it a lot easier to get meaningful results.  Thus it'd
make it easier to compare pre/post padding numbers.

> Will it have safe effect, if the tests are run for 10 or 15 mins
> rather than 5 mins?

s/safe/same/? If so, no, I doesn't look that way. The order of buffers
appears to play a large role; and it won't change in a memory resident
workload over one run.


Andres Freund

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