Re: Checkpoint_segments optimal value - Mailing list pgsql-general

From John R Pierce
Subject Re: Checkpoint_segments optimal value
Date
Msg-id 53CD8048.4010002@hogranch.com
Whole thread Raw
In response to Re: Checkpoint_segments optimal value  (Kevin Grittner <kgrittn@ymail.com>)
Responses Re: Checkpoint_segments optimal value  (Prabhjot Sheena <prabhjot.sheena@rivalwatch.com>)
List pgsql-general
On 7/21/2014 1:51 PM, Kevin Grittner wrote:
> The above might help, but I think the biggest problem may be your
> VM.  You show very low disk I/O numbers, but a pretty significant
> fraction of the time waiting for I/O.  The previously-suggested
> iostat output may help nail it down more specifically, but
> basically you seem to have a big problem with bandwidth for storage
> access.  It's pretty disturbing to see lines in vmstat output which
> show zero disk in or out, but over 10% of CPU time waiting for
> storage?!?

that would suggest to me a large number of VMs sharing a single SATA
drive, or similar.



--
john r pierce                                      37N 122W
somewhere on the middle of the left coast



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