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#include <memory>
#undef NDEBUG
#include <chrono>
#include <thread>
#include "../src/timers.h"
#include "benchmark/benchmark.h"
namespace {
const std::chrono::duration<double, std::milli> time_frame(50);
const double time_frame_in_sec(
std::chrono::duration_cast<std::chrono::duration<double, std::ratio<1, 1>>>(
time_frame)
.count());
void MyBusySpinwait() {
const auto start = benchmark::ChronoClockNow();
while (true) {
const auto now = benchmark::ChronoClockNow();
const auto elapsed = now - start;
if (std::chrono::duration<double, std::chrono::seconds::period>(elapsed) >=
time_frame) {
return;
}
}
}
int numRunThreadsCalled_ = 0;
class ManualThreadRunner : public benchmark::ThreadRunnerBase {
public:
explicit ManualThreadRunner(int num_threads)
: pool(static_cast<size_t>(num_threads - 1)) {}
void RunThreads(const std::function<void(int)>& fn) final {
for (std::size_t ti = 0; ti < pool.size(); ++ti) {
pool[ti] = std::thread(fn, static_cast<int>(ti + 1));
}
fn(0);
for (std::thread& thread : pool) {
thread.join();
}
++numRunThreadsCalled_;
}
private:
std::vector<std::thread> pool;
};
// ========================================================================= //
// --------------------------- TEST CASES BEGIN ---------------------------- //
// ========================================================================= //
// ========================================================================= //
// BM_ManualThreading
// Creation of threads is done before the start of the measurement,
// joining after the finish of the measurement.
void BM_ManualThreading(benchmark::State& state) {
for (auto _ : state) {
MyBusySpinwait();
state.SetIterationTime(time_frame_in_sec);
}
state.counters["invtime"] =
benchmark::Counter{1, benchmark::Counter::kIsRate};
}
} // end namespace
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(1);
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(1)
->UseRealTime();
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(1)
->UseManualTime();
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(1)
->MeasureProcessCPUTime();
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(1)
->MeasureProcessCPUTime()
->UseRealTime();
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(1)
->MeasureProcessCPUTime()
->UseManualTime();
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(2);
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(2)
->UseRealTime();
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(2)
->UseManualTime();
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(2)
->MeasureProcessCPUTime();
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(2)
->MeasureProcessCPUTime()
->UseRealTime();
BENCHMARK(BM_ManualThreading)
->Iterations(1)
->ThreadRunner([](int num_threads) {
return std::make_unique<ManualThreadRunner>(num_threads);
})
->Threads(2)
->MeasureProcessCPUTime()
->UseManualTime();
// ========================================================================= //
// ---------------------------- TEST CASES END ----------------------------- //
// ========================================================================= //
int main(int argc, char* argv[]) {
benchmark::MaybeReenterWithoutASLR(argc, argv);
benchmark::Initialize(&argc, argv);
benchmark::RunSpecifiedBenchmarks();
benchmark::Shutdown();
assert(numRunThreadsCalled_ > 0);
}
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