On 09/05/2011 01:45 PM, Scott Marlowe wrote:
> On Mon, Sep 5, 2011 at 8:08 AM, Gerhard Wohlgenannt<wohlg@ai.wu.ac.at> wrote:
>> Below please find the results of vmstat 2 over some periode of time .. with
>> normal database / system load.
>>
2 1 1344204 240924 104156 31462484 350 0 1906 234 3687 4512 12 3 77 9
>
> Your IO Wait is actually pretty high. On an 8 core machine, 12.5%
> means one core is doing nothing but waiting for IO.
>
My server is 2-core, so these numbers looked fine by me. I need to remember core count when I look at these.
So the line above, for 2 core's would not worry me a bit, but on 8 cores, it pretty much means one core was pegged
(with9% wait? Or is it one core was pegged, and another was 72% io wait?)
I have always loved the vmstat output, but its starting to get confusing when you have to take core's into account.
(Andmy math was never strong in the first place :-) )
Good catch, thanks Scott.
-Andy
