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benchmark: allow no duration in benchmark tests #13110

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benchmark: allow no duration in benchmark tests 
Imprecision in process.hrtime() in some situations can result in a zero
duration being used as a denominator in benchmark tests. This would
almost certainly never happen in real benchmarks. It is only likely in
very short benchmarks like the type we run in our test suite to just
make sure that the benchmark code is runnable.

So, if the environment variable that we use in tests to indicate "allow
ludicrously short benchmarks" is set, convert a zero duration for
a benchmark to 1 nano-second.

Fixes: #13102
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@Trott
Trott committed May 19, 2017
commit fb352aeed3908ca6af45c03a7efd12db22d1162f
5 changes: 4 additions & 1 deletion benchmark/common.js
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Original file line number Diff line number Diff line change
Expand Up @@ -197,7 +197,10 @@ Benchmark.prototype.end = function(operations) {
throw new Error('called end() with operation count <= 0');
}
if (elapsed[0] === 0 && elapsed[1] === 0) {
throw new Error('insufficient time precision for short benchmark');
if (!process.env.NODEJS_BENCHMARK_ZERO_ALLOWED)
throw new Error('insufficient clock precision for short benchmark');
// avoid dividing by zero
elapsed[1] = 1;
}

const time = elapsed[0] + elapsed[1] / 1e9;
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