How to force google benchmark to run multiple iterations?

Question

I use google benchmark to test two C++ functions. One runs for ~630,000,000 ns and one runs for ~1,000,000,000 ns. But both only run one iteration. How can I force the benchmark to run more iterations? I would like it to run at least 10 times.

score 6 · Answer 1 · answered Jan 28 '21 at 17:30

6

You can actually do

BENCHMARK(YourBenchmark)->Iterations(100); // will run for 100 iterations

Note that this will run the benchmark exactly 100 times. I couldn't find a way for it to run at least a number of times

answered Jan 28 '21 at 17:30

McLeary

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Cannot believe I miss this. Maybe I was reading an older document or so? Good to know this, and thank you! – Harper Jan 28 '21 at 17:46
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This should be the accepted answer I think. – Julien Marrec Oct 07 '21 at 10:58

score 4 · Accepted Answer · answered Jan 17 '21 at 03:47

For those who encounter similar problems:

There is no way to directly control the number of iterations for a benchmark. Instead, one can use benchmark_min_time to indirectly configure the number of iterations a benchmark runs. A simple way to do this is:

BENCHMARK(YourBenchmark)->MinTime(10); // 10 seconds

How to force google benchmark to run multiple iterations?

2 Answers2