| From: | John R Pierce <pierce(at)hogranch(dot)com> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Checkpoint_segments optimal value |
| Date: | 2014-07-21 21:04:08 |
| Message-ID: | 53CD8048.4010002@hogranch.com |
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| Lists: | pgsql-admin 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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