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CPU clock numbers reported in codeXL

Question asked by pzhou on Feb 9, 2017

I'm using code XL to measure CPU L2 requests, L2 misses, CPU clocks on a Carrizo system, which has 4 cores.

for example, I got the following data:

   CPU clocks: 426794

   L2 request:   281557

   L2 misses:   115241

  L2 fill/writeback: 275666


my question is about clocks, since there are four cores in this APU, is the CPU clocks the sum of all clocks elapsed on all 4 cores? which of the following is true?

426794 = clock elapsed from Core 1 + ... clocks elapsed from Core 4

426794 = total sample time, it is not related to the number of cores