| #include <chrono> |
| #include <thread> |
| |
| #include "benchmark/benchmark.h" |
| |
| #if defined(NDEBUG) |
| #undef NDEBUG |
| #endif |
| #include <cassert> |
| |
| void BM_basic(benchmark::State& state) { |
| for (auto _ : state) { |
| } |
| } |
| |
| void BM_basic_slow(benchmark::State& state) { |
| std::chrono::milliseconds sleep_duration(state.range(0)); |
| for (auto _ : state) { |
| std::this_thread::sleep_for( |
| std::chrono::duration_cast<std::chrono::nanoseconds>(sleep_duration)); |
| } |
| } |
| |
| BENCHMARK(BM_basic); |
| BENCHMARK(BM_basic)->Arg(42); |
| BENCHMARK(BM_basic_slow)->Arg(10)->Unit(benchmark::kNanosecond); |
| BENCHMARK(BM_basic_slow)->Arg(100)->Unit(benchmark::kMicrosecond); |
| BENCHMARK(BM_basic_slow)->Arg(1000)->Unit(benchmark::kMillisecond); |
| BENCHMARK(BM_basic_slow)->Arg(1000)->Unit(benchmark::kSecond); |
| BENCHMARK(BM_basic)->Range(1, 8); |
| BENCHMARK(BM_basic)->RangeMultiplier(2)->Range(1, 8); |
| BENCHMARK(BM_basic)->DenseRange(10, 15); |
| BENCHMARK(BM_basic)->Args({42, 42}); |
| BENCHMARK(BM_basic)->Ranges({{64, 512}, {64, 512}}); |
| BENCHMARK(BM_basic)->MinTime(0.7); |
| BENCHMARK(BM_basic)->MinWarmUpTime(0.8); |
| BENCHMARK(BM_basic)->MinTime(0.1)->MinWarmUpTime(0.2); |
| BENCHMARK(BM_basic)->UseRealTime(); |
| BENCHMARK(BM_basic)->ThreadRange(2, 4); |
| BENCHMARK(BM_basic)->ThreadPerCpu(); |
| BENCHMARK(BM_basic)->Repetitions(3); |
| BENCHMARK(BM_basic) |
| ->RangeMultiplier(std::numeric_limits<int>::max()) |
| ->Range(std::numeric_limits<int64_t>::min(), |
| std::numeric_limits<int64_t>::max()); |
| |
| // Negative ranges |
| BENCHMARK(BM_basic)->Range(-64, -1); |
| BENCHMARK(BM_basic)->RangeMultiplier(4)->Range(-8, 8); |
| BENCHMARK(BM_basic)->DenseRange(-2, 2, 1); |
| BENCHMARK(BM_basic)->Ranges({{-64, 1}, {-8, -1}}); |
| |
| void CustomArgs(benchmark::internal::Benchmark* b) { |
| for (int i = 0; i < 10; ++i) { |
| b->Arg(i); |
| } |
| } |
| |
| BENCHMARK(BM_basic)->Apply(CustomArgs); |
| |
| void BM_explicit_iteration_count(benchmark::State& state) { |
| // Test that benchmarks specified with an explicit iteration count are |
| // only run once. |
| static bool invoked_before = false; |
| assert(!invoked_before); |
| invoked_before = true; |
| |
| // Test that the requested iteration count is respected. |
| assert(state.max_iterations == 42); |
| for (auto _ : state) { |
| } |
| assert(state.iterations() == state.max_iterations); |
| assert(state.iterations() == 42); |
| } |
| BENCHMARK(BM_explicit_iteration_count)->Iterations(42); |
| |
| BENCHMARK_MAIN(); |