Comment by NelsonMinar

I love pv but how much does adding the pipe affect overhead? I feel like most of my big jobs I want to measure are on things where you want the program to have direct access to the underlying file or storage. `pv somefile | dd` is going to be slower than `dd somefile`. At least I think so? I have no idea what modern Linux I/O can optimize.

Also does pv necessitate doing single threaded I/O?