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Re: Disk latency goes up during certaing pediods - Mailing list pgsql-admin

From German Becker
Subject Re: Disk latency goes up during certaing pediods
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Msg-id CALyjCLv0eQVNd1Xd3FJ+smDkeo05LxF0LXh1-_Dpq7hKF_JcyQ@mail.gmail.com
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In response to Re: Disk latency goes up during certaing pediods  (bricklen <bricklen@gmail.com>)
Responses Re: Disk latency goes up during certaing pediods  (bricklen <bricklen@gmail.com>)
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256 was set some time when we were testing a differnt issue. I read that the only drawback is the amunt of time required for recovery, which was tested and it was like 10 seconds for the 256 segments, and higher values mean less disk usage.
Anyway all these parameters should affect the throughput to the data disks, not the WAL, Am I right?


On Mon, Jul 29, 2013 at 6:07 PM, bricklen <bricklen@gmail.com> wrote:

On Mon, Jul 29, 2013 at 1:28 PM, German Becker <german.becker@gmail.com> wrote:
checkpoint_segments = 256               # in logfile segments, min 1, 16MB each


I'm curious about checkpoint_segments. 256 seems pretty high -- did testing show that that helps?

 
checkpoint_completion_target = 0.7      # checkpoint target duration, 0.0 - 1.0

0.7 could be bumped up to 0.9, but I doubt that that will make a very noticeable difference for this particular issue.

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