Re: High CPU usage / load average after upgrading to Ubuntu 12.04

On Mon, Feb 18, 2013 at 5:39 PM, Josh Berkus <josh@agliodbs.com> wrote:
> Scott,
>
>> So do you have generally slow IO, or is it fsync behavior etc?
>
> All tests except pgBench show this system as superfast.  Bonnie++ and DD
> tests are good (200 to 300mb/s), and test_fsync shows 14K/second.
> Basically it has no issues until checkpoint kicks in, at which time the
> entire system basically halts for the duration of the checkpoint.

I assume you've made attemtps at write levelling to reduce impacts of
checkpoints etc.