Fio blog post on periodic performance measurements

[Vincent Fu <vincentfu@xxxxxxxxx>]

I am happy to announce that the fio blog has a new post. I describe 
fio's periodic performance measurements and how they can be used to 
understand how performance levels vary during a job run.

Take a look:

https://github.com/vincentkfu/fio-blog/wiki/Periodic-performance-measurements

Feedback is welcome!

Vincent