Getting Execution Time of progams on armv8_64-bit processors

I have written a library for ARMv8-A 64 bit processors (OS- linaro debian). Now I want to time them. I am utilising gcc compiler and on Intel processors I was timing the execution utilising std::chrono high resolution clock. The issue with arm is, it's quite volatile,. The timing difference between two different runs of the same executable can be significantly different.

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