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Is the CPU cycle credible?

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I am using gem5 to test if program is timing leakage free.

However, I found programs with the same cache miss/hit, and same execution path (the only difference is the value of an variable used as input) still have different CPU cycles. I am wondering how gem5 is calculating the CPU cycle?

The program I used contains only logical computation, no memcpy, printf etc.
asked Jul 6 in Ruby by meng (120 points)

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