| #include "benchmark/benchmark.h" |
| |
| #include <assert.h> |
| #include <math.h> |
| #include <stdint.h> |
| |
| #include <iostream> |
| #include <sstream> |
| #include <string> |
| |
| namespace { |
| |
| double CalculatePi(int depth) { |
| double pi = 0.0; |
| for (int i = 0; i < depth; ++i) { |
| double numerator = static_cast<double>(((i % 2) * 2) - 1); |
| double denominator = static_cast<double>((2 * i) - 1); |
| pi += numerator / denominator; |
| } |
| return (pi - 1.0) * 4; |
| } |
| |
| class TestReporter : public benchmark::internal::ConsoleReporter { |
| public: |
| virtual bool ReportContext(const Context& context) const { |
| return ConsoleReporter::ReportContext(context); |
| }; |
| |
| virtual void ReportRuns(const std::vector<Run>& report) const { |
| ++count_; |
| ConsoleReporter::ReportRuns(report); |
| }; |
| |
| TestReporter() : count_(0) {} |
| |
| virtual ~TestReporter() {} |
| |
| size_t GetCount() const { |
| return count_; |
| } |
| |
| private: |
| mutable size_t count_; |
| }; |
| |
| } // end namespace |
| |
| static void BM_CalculatePiRange(benchmark::State& state) { |
| double pi = 0.0; |
| while (state.KeepRunning()) |
| pi = CalculatePi(state.range_x()); |
| std::stringstream ss; |
| ss << pi; |
| state.SetLabel(ss.str()); |
| } |
| BENCHMARK_RANGE(BM_CalculatePiRange, 1, 1024 * 1024); |
| |
| static void BM_CalculatePi(benchmark::State& state) { |
| static const int depth = 1024; |
| double pi BENCHMARK_UNUSED = 0.0; |
| while (state.KeepRunning()) { |
| pi = CalculatePi(depth); |
| } |
| } |
| BENCHMARK(BM_CalculatePi)->Threads(8); |
| BENCHMARK(BM_CalculatePi)->ThreadRange(1, 32); |
| BENCHMARK(BM_CalculatePi)->ThreadPerCpu(); |
| |
| int main(int argc, const char* argv[]) { |
| benchmark::Initialize(&argc, argv); |
| |
| assert(CalculatePi(1) == 0.0); |
| |
| TestReporter test_reporter; |
| benchmark::RunSpecifiedBenchmarks(&test_reporter); |
| |
| // Make sure we ran all of the tests |
| const size_t count = test_reporter.GetCount(); |
| const size_t expected = (argc == 2) ? std::stoul(argv[1]) : count; |
| if (count != expected) { |
| std::cerr << "ERROR: Expected " << expected << " tests to be ran but only " |
| << count << " completed" << std::endl; |
| return -1; |
| } |
| } |
| |