I think one thing people tend to easily forget is that measuring I/O rates based on end-to-end time is a useful number, but I also find it very important to look at the rates over time, as often as once a second and compare them with what's happening on the rest of the system by also looking at the cpu, memory, network or even interrupts as well as other subsystems and that's why I wrote http://collectl.sourceforge.net/. I find this to be very complementary to load generators because they can be counted on to deliver a known I/O stream and collectl can tell you what's happening during that load. If you want a real quick look with minimal effort look at http://collectl.sourceforge.net/Examples.html.
-mark
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Re: Inspecting disk IO performance with fio
Posted by: Mark Seger on April 19, 2008 02:32 PM-mark
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