On 02/18/2014 10:51 PM, Andres Freund wrote:
On 2014-02-18 19:12:32 +0200, Heikki Linnakangas wrote:
Yeah, I'm pretty sure that's because of the extra checkpoints. If you look
at the individual test graphs, there are clear spikes in latency, but the
latency is otherwise small. With a higher TPS, you reach checkpoint_segments
quicker; I should've eliminated that effect in the tests I ran...

I don't think that'd be a good idea. The number of full page writes so
greatly influences the WAL charactersistics, that changing checkpoint
segments would make the tests much harder to compare.

I was just thinking of bumping up checkpoint_segments so high that there are no checkpoints during any of the tests.

- Heikki

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