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Further cleaning of initial commit. Add test.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| #include <cassert> | ||
| #include <cstdlib> | ||
| #include <cstring> | ||
| #include <iostream> | ||
| #include <random> | ||
| #include <string> | ||
| #include <vector> | ||
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| #include "benchmark/benchmark.h" | ||
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| // Tests that if a benchmark measures time manually, we can specify the required relative accuracy with | ||
| // --benchmark_min_rel_accuracy=<min_rel_accuracy>. | ||
| namespace { | ||
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| class TestReporter : public benchmark::ConsoleReporter { | ||
| public: | ||
| virtual bool ReportContext(const Context& context) BENCHMARK_OVERRIDE { | ||
| return ConsoleReporter::ReportContext(context); | ||
| }; | ||
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| virtual void ReportRuns(const std::vector<Run>& report) BENCHMARK_OVERRIDE { | ||
| assert(report.size() == 1); | ||
| iters_.push_back(report[0].iterations); | ||
| real_accumulated_times_.push_back(report[0].real_accumulated_time); | ||
| manual_accumulated_time_pow2s_.push_back(report[0].manual_accumulated_time_pow2); | ||
| ConsoleReporter::ReportRuns(report); | ||
| }; | ||
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| TestReporter() {} | ||
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| virtual ~TestReporter() {} | ||
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| const std::vector<benchmark::IterationCount>& GetIters() const { | ||
| return iters_; | ||
| } | ||
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| const std::vector<double>& GetRealAccumulatedTimes() const { | ||
| return real_accumulated_times_; | ||
| } | ||
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| const std::vector<double>& GetManualAccumulatedTimePow2s() const { | ||
| return manual_accumulated_time_pow2s_; | ||
| } | ||
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| private: | ||
| std::vector<benchmark::IterationCount> iters_; | ||
| std::vector<double> real_accumulated_times_; | ||
| std::vector<double> manual_accumulated_time_pow2s_; | ||
| }; | ||
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| } // end namespace | ||
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| static void BM_MyBench(benchmark::State& state) { | ||
| static std::mt19937 rd{std::random_device{}()}; | ||
| static std::uniform_real_distribution<double> mrand(0, 1); | ||
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| for (auto s : state) { | ||
| state.SetIterationTime(mrand(rd)); | ||
| } | ||
| } | ||
| BENCHMARK(BM_MyBench)->UseManualTime(); | ||
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| int main(int argc, char** argv) { | ||
| // Make a fake argv and append the new --benchmark_min_rel_accuracy=<min_rel_accuracy> to it. | ||
| int fake_argc = argc + 2; | ||
| const char** fake_argv = new const char*[static_cast<size_t>(fake_argc)]; | ||
| for (int i = 0; i < argc; ++i) fake_argv[i] = argv[i]; | ||
| fake_argv[argc] = "--benchmark_min_time=10s"; | ||
| fake_argv[argc + 1] = "--benchmark_min_rel_accuracy=0.01"; | ||
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| benchmark::Initialize(&fake_argc, const_cast<char**>(fake_argv)); | ||
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| TestReporter test_reporter; | ||
| const size_t returned_count = | ||
| benchmark::RunSpecifiedBenchmarks(&test_reporter, "BM_MyBench"); | ||
| assert(returned_count == 1); | ||
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| // Check the executed iters. | ||
| const benchmark::IterationCount iters = test_reporter.GetIters()[0]; | ||
| const double real_accumulated_time = test_reporter.GetRealAccumulatedTimes()[0]; | ||
| const double manual_accumulated_time_pow2 = test_reporter.GetManualAccumulatedTimePow2s()[0]; | ||
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| const double rel_accuracy = std::sqrt(manual_accumulated_time_pow2 / iters - std::pow(real_accumulated_time / iters, 2.)) / (real_accumulated_time / iters) / sqrt(iters); | ||
| assert(rel_accuracy <= 0.01); | ||
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| delete[] fake_argv; | ||
| return 0; | ||
| } |