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1#include <chrono>2#include <thread>3 4#include "benchmark/benchmark.h"5 6#if defined(NDEBUG)7#undef NDEBUG8#endif9#include <cassert>10 11void BM_basic(benchmark::State& state) {12 for (auto _ : state) {13 }14}15 16void BM_basic_slow(benchmark::State& state) {17 std::chrono::milliseconds sleep_duration(state.range(0));18 for (auto _ : state) {19 std::this_thread::sleep_for(20 std::chrono::duration_cast<std::chrono::nanoseconds>(sleep_duration));21 }22}23 24BENCHMARK(BM_basic);25BENCHMARK(BM_basic)->Arg(42);26BENCHMARK(BM_basic_slow)->Arg(10)->Unit(benchmark::kNanosecond);27BENCHMARK(BM_basic_slow)->Arg(100)->Unit(benchmark::kMicrosecond);28BENCHMARK(BM_basic_slow)->Arg(1000)->Unit(benchmark::kMillisecond);29BENCHMARK(BM_basic_slow)->Arg(1000)->Unit(benchmark::kSecond);30BENCHMARK(BM_basic)->Range(1, 8);31BENCHMARK(BM_basic)->RangeMultiplier(2)->Range(1, 8);32BENCHMARK(BM_basic)->DenseRange(10, 15);33BENCHMARK(BM_basic)->Args({42, 42});34BENCHMARK(BM_basic)->Ranges({{64, 512}, {64, 512}});35BENCHMARK(BM_basic)->MinTime(0.7);36BENCHMARK(BM_basic)->MinWarmUpTime(0.8);37BENCHMARK(BM_basic)->MinTime(0.1)->MinWarmUpTime(0.2);38BENCHMARK(BM_basic)->UseRealTime();39BENCHMARK(BM_basic)->ThreadRange(2, 4);40BENCHMARK(BM_basic)->ThreadPerCpu();41BENCHMARK(BM_basic)->Repetitions(3);42BENCHMARK(BM_basic)43 ->RangeMultiplier(std::numeric_limits<int>::max())44 ->Range(std::numeric_limits<int64_t>::min(),45 std::numeric_limits<int64_t>::max());46 47// Negative ranges48BENCHMARK(BM_basic)->Range(-64, -1);49BENCHMARK(BM_basic)->RangeMultiplier(4)->Range(-8, 8);50BENCHMARK(BM_basic)->DenseRange(-2, 2, 1);51BENCHMARK(BM_basic)->Ranges({{-64, 1}, {-8, -1}});52 53void CustomArgs(benchmark::internal::Benchmark* b) {54 for (int i = 0; i < 10; ++i) {55 b->Arg(i);56 }57}58 59BENCHMARK(BM_basic)->Apply(CustomArgs);60 61void BM_explicit_iteration_count(benchmark::State& state) {62 // Test that benchmarks specified with an explicit iteration count are63 // only run once.64 static bool invoked_before = false;65 assert(!invoked_before);66 invoked_before = true;67 68 // Test that the requested iteration count is respected.69 assert(state.max_iterations == 42);70 for (auto _ : state) {71 }72 assert(state.iterations() == state.max_iterations);73 assert(state.iterations() == 42);74}75BENCHMARK(BM_explicit_iteration_count)->Iterations(42);76 77BENCHMARK_MAIN();78