Require a steady clock for bench with at least micro precision
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2 changed files with 5 additions and 4 deletions
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@ -23,6 +23,9 @@ void
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benchmark::BenchRunner::RunAll(benchmark::duration elapsedTimeForOne)
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{
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perf_init();
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if (std::ratio_less_equal<benchmark::clock::period, std::micro>::value) {
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std::cerr << "WARNING: Clock precision is worse than microsecond - benchmarks may be less accurate!\n";
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}
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std::cout << "#Benchmark" << "," << "count" << "," << "min(ns)" << "," << "max(ns)" << "," << "average(ns)" << ","
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<< "min_cycles" << "," << "max_cycles" << "," << "average_cycles" << "\n";
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@ -37,13 +37,11 @@ BENCHMARK(CODE_TO_TIME);
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*/
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namespace benchmark {
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// On many systems, the high_resolution_clock offers no better resolution than the steady_clock.
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// If that's the case, prefer the steady_clock.
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// In case high_resolution_clock is steady, prefer that, otherwise use steady_clock.
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struct best_clock {
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using hi_res_clock = std::chrono::high_resolution_clock;
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using steady_clock = std::chrono::steady_clock;
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static constexpr bool steady_is_high_res = std::ratio_less_equal<steady_clock::period, hi_res_clock::period>::value;
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using type = std::conditional<steady_is_high_res, steady_clock, hi_res_clock>::type;
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using type = std::conditional<hi_res_clock::is_steady, hi_res_clock, steady_clock>::type;
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};
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using clock = best_clock::type;
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using time_point = clock::time_point;
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