Why does disk I/O slow down a CPU bound task?

[Dave Johansen]

On Wed, Apr 1, 2015 at 1:32 AM, Reindl Harald <h.reindl at thelounge.net>
wrote:

>
>
> Am 01.04.2015 um 06:53 schrieb Dave Johansen:
>
>> I added the call to mlockall() (it did have to be run as root) on a F21
>> machine with no swap and the slow down was still visible in the "CPU
>> bound task"
>>
>
> surely, as expected
>
>
> http://serverfault.com/questions/12679/can-anyone-explain-precisely-what-iowait-is
>

I don't get how that is expected. The "CPU bound task" is now basically
guaranteed to not be doing anything that requires disk access, so the
iowait should be 0 for the "CPU bound task".
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