synchronous_commit = off does make a significant difference.
Sure, but I had thought about that and kept this one...
I think I found one possible culprit: I automatically wrote 300 seconds
for checkpoint_timeout, instead of 30 seconds in your settings. I'll have
to rerun the tests with this (unreasonnable) figure to check whether I
really get a regression.
Other tests I ran with "reasonnable" settings on a large (scale=800) db
did not show any significant performance regression, up to know.
--
Fabien.
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