1 #include <chrono>
2 #include <thread>
3
4 #include "benchmark/benchmark.h"
5
6 #if defined(NDEBUG)
7 #undef NDEBUG
8 #endif
9 #include <cassert>
10
BM_basic(benchmark::State & state)11 void BM_basic(benchmark::State& state) {
12 for (auto _ : state) {
13 }
14 }
15
BM_basic_slow(benchmark::State & state)16 void 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
24 BENCHMARK(BM_basic);
25 BENCHMARK(BM_basic)->Arg(42);
26 BENCHMARK(BM_basic_slow)->Arg(10)->Unit(benchmark::kNanosecond);
27 BENCHMARK(BM_basic_slow)->Arg(100)->Unit(benchmark::kMicrosecond);
28 BENCHMARK(BM_basic_slow)->Arg(1000)->Unit(benchmark::kMillisecond);
29 BENCHMARK(BM_basic_slow)->Arg(1000)->Unit(benchmark::kSecond);
30 BENCHMARK(BM_basic)->Range(1, 8);
31 BENCHMARK(BM_basic)->RangeMultiplier(2)->Range(1, 8);
32 BENCHMARK(BM_basic)->DenseRange(10, 15);
33 BENCHMARK(BM_basic)->Args({42, 42});
34 BENCHMARK(BM_basic)->Ranges({{64, 512}, {64, 512}});
35 BENCHMARK(BM_basic)->MinTime(0.7);
36 BENCHMARK(BM_basic)->MinWarmUpTime(0.8);
37 BENCHMARK(BM_basic)->MinTime(0.1)->MinWarmUpTime(0.2);
38 BENCHMARK(BM_basic)->UseRealTime();
39 BENCHMARK(BM_basic)->ThreadRange(2, 4);
40 BENCHMARK(BM_basic)->ThreadPerCpu();
41 BENCHMARK(BM_basic)->Repetitions(3);
42 BENCHMARK(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 ranges
48 BENCHMARK(BM_basic)->Range(-64, -1);
49 BENCHMARK(BM_basic)->RangeMultiplier(4)->Range(-8, 8);
50 BENCHMARK(BM_basic)->DenseRange(-2, 2, 1);
51 BENCHMARK(BM_basic)->Ranges({{-64, 1}, {-8, -1}});
52
CustomArgs(benchmark::internal::Benchmark * b)53 void CustomArgs(benchmark::internal::Benchmark* b) {
54 for (int i = 0; i < 10; ++i) {
55 b->Arg(i);
56 }
57 }
58
59 BENCHMARK(BM_basic)->Apply(CustomArgs);
60
BM_explicit_iteration_count(benchmark::State & state)61 void BM_explicit_iteration_count(benchmark::State& state) {
62 // Test that benchmarks specified with an explicit iteration count are
63 // 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 }
75 BENCHMARK(BM_explicit_iteration_count)->Iterations(42);
76
77 BENCHMARK_MAIN();
78