| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> |
| Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: postgresql latency & bgwriter not doing its job |
| Date: | 2014-08-27 09:14:46 |
| Message-ID: | 20140827091446.GC21544@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2014-08-27 11:05:52 +0200, Fabien COELHO wrote:
> I can test a couple of patches. I already did one on someone advice (make
> bgwriter round all stuff in 1s instead of 120s, without positive effect.
I've quickly cobbled together the attached patch (which at least doesn't
seem to crash & burn). It tries to trigger pages being flushed out
during the paced phase of checkpoints instead of the fsync phase. The
sync_on_checkpoint_flush can be used to enable/disable that behaviour.
I'd be interested to hear whether that improves your latency numbers. I
unfortunately don't have more time to spend on this right now :(.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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