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25acf220a4
Recently the library added a new ranged-for variant of the KeepRunning loop that is much faster. For this reason it should be preferred in all new code. Because a library, its documentation, and its tests should all embody the best practices of using the library, this patch changes all but a few usages of KeepRunning() into for (auto _ : state). The remaining usages in the tests and documentation persist only to document and test behavior that is different between the two formulations. Also note that because the range-for loop requires C++11, the KeepRunning variant has not been deprecated at this time.
119 lines
3 KiB
C++
119 lines
3 KiB
C++
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#include "benchmark/benchmark.h"
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#define BASIC_BENCHMARK_TEST(x) BENCHMARK(x)->Arg(8)->Arg(512)->Arg(8192)
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void BM_empty(benchmark::State& state) {
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for (auto _ : state) {
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benchmark::DoNotOptimize(state.iterations());
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}
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}
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BENCHMARK(BM_empty);
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BENCHMARK(BM_empty)->ThreadPerCpu();
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void BM_spin_empty(benchmark::State& state) {
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for (auto _ : state) {
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for (int x = 0; x < state.range(0); ++x) {
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benchmark::DoNotOptimize(x);
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}
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}
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}
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BASIC_BENCHMARK_TEST(BM_spin_empty);
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BASIC_BENCHMARK_TEST(BM_spin_empty)->ThreadPerCpu();
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void BM_spin_pause_before(benchmark::State& state) {
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for (int i = 0; i < state.range(0); ++i) {
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benchmark::DoNotOptimize(i);
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}
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for (auto _ : state) {
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for (int i = 0; i < state.range(0); ++i) {
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benchmark::DoNotOptimize(i);
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}
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}
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}
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BASIC_BENCHMARK_TEST(BM_spin_pause_before);
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BASIC_BENCHMARK_TEST(BM_spin_pause_before)->ThreadPerCpu();
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void BM_spin_pause_during(benchmark::State& state) {
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for (auto _ : state) {
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state.PauseTiming();
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for (int i = 0; i < state.range(0); ++i) {
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benchmark::DoNotOptimize(i);
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}
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state.ResumeTiming();
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for (int i = 0; i < state.range(0); ++i) {
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benchmark::DoNotOptimize(i);
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}
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}
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}
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BASIC_BENCHMARK_TEST(BM_spin_pause_during);
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BASIC_BENCHMARK_TEST(BM_spin_pause_during)->ThreadPerCpu();
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void BM_pause_during(benchmark::State& state) {
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for (auto _ : state) {
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state.PauseTiming();
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state.ResumeTiming();
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}
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}
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BENCHMARK(BM_pause_during);
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BENCHMARK(BM_pause_during)->ThreadPerCpu();
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BENCHMARK(BM_pause_during)->UseRealTime();
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BENCHMARK(BM_pause_during)->UseRealTime()->ThreadPerCpu();
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void BM_spin_pause_after(benchmark::State& state) {
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for (auto _ : state) {
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for (int i = 0; i < state.range(0); ++i) {
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benchmark::DoNotOptimize(i);
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}
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}
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for (int i = 0; i < state.range(0); ++i) {
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benchmark::DoNotOptimize(i);
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}
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}
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BASIC_BENCHMARK_TEST(BM_spin_pause_after);
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BASIC_BENCHMARK_TEST(BM_spin_pause_after)->ThreadPerCpu();
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void BM_spin_pause_before_and_after(benchmark::State& state) {
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for (int i = 0; i < state.range(0); ++i) {
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benchmark::DoNotOptimize(i);
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}
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for (auto _ : state) {
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for (int i = 0; i < state.range(0); ++i) {
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benchmark::DoNotOptimize(i);
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}
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}
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for (int i = 0; i < state.range(0); ++i) {
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benchmark::DoNotOptimize(i);
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}
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}
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BASIC_BENCHMARK_TEST(BM_spin_pause_before_and_after);
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BASIC_BENCHMARK_TEST(BM_spin_pause_before_and_after)->ThreadPerCpu();
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void BM_empty_stop_start(benchmark::State& state) {
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for (auto _ : state) {
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}
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}
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BENCHMARK(BM_empty_stop_start);
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BENCHMARK(BM_empty_stop_start)->ThreadPerCpu();
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void BM_KeepRunning(benchmark::State& state) {
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size_t iter_count = 0;
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while (state.KeepRunning()) {
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++iter_count;
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}
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assert(iter_count == state.max_iterations);
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}
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BENCHMARK(BM_KeepRunning);
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void BM_RangedFor(benchmark::State& state) {
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size_t iter_count = 0;
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for (auto _ : state) {
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++iter_count;
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}
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assert(iter_count == state.max_iterations);
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}
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BENCHMARK(BM_RangedFor);
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BENCHMARK_MAIN()
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