I want a measure of how much of the peak performance my kernel archives.

Say I have a NVIDIA Tesla C1060, which has a peak GFLOPS of 622.08 (~= 240Cores * 1300MHz * 2). Now in my kernel I counted for each thread 16000 flop (4000 x (2 subtraction, 1 multiplication and 1 sqrt)). So when I have 1,000,000 threads I would come up with 16GFLOP. And as the kernel takes 0.1 seconds I would archive 160GFLOPS, which would be a quarter of the peak performance. Now my questions:

  • Is this approach correct?
  • What about comparisons (if(a>b) then....)? Do I have to consider them as well?
  • Can I use the CUDA profiler for easier and more accurate results? I tried the instructions counter, but I could not figure out, what the figure means.

sister question: How to calculate the achieved bandwidth of a CUDA kernel

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