OT: recommended way of timing two pieces of code in C

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Hi,

Disclaimer: This is clearly marked OT, with the only connection to this group being the fact that I am running F23 on a 20-core Dell T5810 @3.1 GHz each and 64 GiB memory. My OT queries over the past 13 years (almost) here have elicited great wealth of information so I am posing here.

So, I am trying to compare two kinds of methods in a C program. Both are written as efficiently as possible (assumed because no point otherwise). I would like to know which of these is more efficient. I have been using get_rusage but I was wondering whether there is a better way?

Separately, is there a way to get the number of floating point instructions in C? Both FLOPS and MIPS? 

Many thanks and best wishes,
Ranjan

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