CppCon 2015: Chandler Carruth "Tuning C++: Benchmarks, and CPUs, and Compilers! Oh My!"

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Carruth 从向量操作的微基准追到机器指令。计时循环若没留下编译器认可的可观察效果，编译器能改变实际执行的工作，让漂亮数字失去原来的含义。

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micro benchmarks are when you're benchmarking some really isolated part of your system

In my case the observable side effect is the benchmarking.