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30723
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