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llvm-project/third-party/benchmark/docs/random_interleaving.md
Mircea Trofin 1ee32055ea Reland "[benchmarks] Move libcxx's fork of google/benchmark and llvm/utils'"" 
This reverts commit e7568b68da8a216dc22cdc1c6d8903c94096c846 and relands
c6f7b720ecfa6db40c648eb05e319f8a817110e9.

The culprit was: missed that libc also had a dependency on one of the
copies of `google-benchmark`

Also opportunistically fixed indentation from prev. change.

Differential Revision: https://reviews.llvm.org/D112012
2021-11-16 10:33:31 -08:00

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Random Interleaving

Random Interleaving is a technique to lower run-to-run variance. It randomly interleaves repetitions of a microbenchmark with repetitions from other microbenchmarks in the same benchmark test. Data shows it is able to lower run-to-run variance by 40% on average.

To use, you mainly need to set --benchmark_enable_random_interleaving=true, and optionally specify non-zero repetition count --benchmark_repetitions=9 and optionally decrease the per-repetition time --benchmark_min_time=0.1.