1#include "benchmark/benchmark.h" 2#include <chrono> 3#include <thread> 4 5#if defined(NDEBUG) 6#undef NDEBUG 7#endif 8#include <cassert> 9 10void BM_basic(benchmark::State& state) { 11 for (auto _ : state) { 12 } 13} 14 15void BM_basic_slow(benchmark::State& state) { 16 std::chrono::milliseconds sleep_duration(state.range(0)); 17 for (auto _ : state) { 18 std::this_thread::sleep_for( 19 std::chrono::duration_cast<std::chrono::nanoseconds>(sleep_duration)); 20 } 21} 22 23BENCHMARK(BM_basic); 24BENCHMARK(BM_basic)->Arg(42); 25BENCHMARK(BM_basic_slow)->Arg(10)->Unit(benchmark::kNanosecond); 26BENCHMARK(BM_basic_slow)->Arg(100)->Unit(benchmark::kMicrosecond); 27BENCHMARK(BM_basic_slow)->Arg(1000)->Unit(benchmark::kMillisecond); 28BENCHMARK(BM_basic)->Range(1, 8); 29BENCHMARK(BM_basic)->RangeMultiplier(2)->Range(1, 8); 30BENCHMARK(BM_basic)->DenseRange(10, 15); 31BENCHMARK(BM_basic)->Args({42, 42}); 32BENCHMARK(BM_basic)->Ranges({{64, 512}, {64, 512}}); 33BENCHMARK(BM_basic)->MinTime(0.7); 34BENCHMARK(BM_basic)->UseRealTime(); 35BENCHMARK(BM_basic)->ThreadRange(2, 4); 36BENCHMARK(BM_basic)->ThreadPerCpu(); 37BENCHMARK(BM_basic)->Repetitions(3); 38 39void CustomArgs(benchmark::internal::Benchmark* b) { 40 for (int i = 0; i < 10; ++i) { 41 b->Arg(i); 42 } 43} 44 45BENCHMARK(BM_basic)->Apply(CustomArgs); 46 47void BM_explicit_iteration_count(benchmark::State& state) { 48 // Test that benchmarks specified with an explicit iteration count are 49 // only run once. 50 static bool invoked_before = false; 51 assert(!invoked_before); 52 invoked_before = true; 53 54 // Test that the requested iteration count is respected. 55 assert(state.max_iterations == 42); 56 size_t actual_iterations = 0; 57 for (auto _ : state) 58 ++actual_iterations; 59 assert(state.iterations() == state.max_iterations); 60 assert(state.iterations() == 42); 61 62} 63BENCHMARK(BM_explicit_iteration_count)->Iterations(42); 64 65BENCHMARK_MAIN(); 66