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2014 May 16
5
[LLVMdev] Use perf tool for more accurate time measuring on Linux
Hi all, The LLVM benchmarking system produces very noisy results even on quiet machines. One of the sources of inaccuracy is the timing tool we are using. Because it is a user-space tool, the OS can context switch it and we will get an outlier result. Perf stat uses SW_TASK_CLOCK counter in kernel to measure time, therefore more accurate. It also does not get context switched. I've