| From: | John R Pierce <pierce(at)hogranch(dot)com> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Amazon High I/O instances |
| Date: | 2012-09-12 22:58:33 |
| Message-ID: | 50511399.3090505@hogranch.com |
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| Lists: | pgsql-general |
On 09/12/12 3:17 PM, François Beausoleil wrote:
> What are the iostat / vmstat numbers during the test?
note you need to run iostat with -x <interval> and ignore the first
sample as its average since reboot. I usually use 5, 10, or 30 second
intervals when analyzing IO performance problems.
on a system with multiple storage devices, the device list can get long
and confusing, I'll often specify just the device(s) I'm investigating...
iostat -x 5 sdc sdd
ditto, vmstat needs a <interval> argument, or it shows average since reboot
--
john r pierce N 37, W 122
santa cruz ca mid-left coast
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