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#include "ATen/Parallel.h"
#include "c10/util/Flags.h"
#include "caffe2/core/init.h"
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <iostream>
#include <mutex>
#include <ctime>
C10_DEFINE_int(iter, 10e4, "Number of at::launch iterations (tasks)");
C10_DEFINE_int(warmup_iter, 10, "Number of warmup iterations")
C10_DEFINE_int(inter_op_threads, 0, "Number of inter-op threads");
C10_DEFINE_int(benchmark_iter, 3, "Number of times to run benchmark")
namespace {
int iter = 0;
std::atomic<int> counter{0};
std::condition_variable cv;
std::mutex mutex;
}
void launch_tasks() {
at::launch([]() {
at::launch([](){
at::launch([]() {
auto cur_ctr = ++counter;
if (cur_ctr == iter) {
std::unique_lock<std::mutex> lk(mutex);
cv.notify_one();
}
});
});
});
}
void launch_tasks_and_wait(int tasks_num) {
iter = tasks_num;
counter = 0;
for (auto idx = 0; idx < iter; ++idx) {
launch_tasks();
}
{
std::unique_lock<std::mutex> lk(mutex);
while (counter < iter) {
cv.wait(lk);
}
}
}
int main(int argc, char** argv) {
if (!c10::ParseCommandLineFlags(&argc, &argv)) {
std::cout << "Failed to parse command line flags" << std::endl;
return -1;
}
caffe2::unsafeRunCaffe2InitFunction("registerThreadPools");
at::init_num_threads();
if (FLAGS_inter_op_threads > 0) {
at::set_num_interop_threads(FLAGS_inter_op_threads);
}
typedef std::chrono::high_resolution_clock clock;
typedef std::chrono::milliseconds ms;
std::cout << "Launching " << FLAGS_warmup_iter << " warmup tasks using "
<< at::get_num_interop_threads() << " threads "
<< std::endl;
std::chrono::time_point<clock> start_time = clock::now();
launch_tasks_and_wait(FLAGS_warmup_iter);
auto duration = static_cast<float>(
std::chrono::duration_cast<ms>(clock::now() - start_time).count());
std::cout << "Warmup time: " << duration << " ms." << std::endl;
std::cout << "Launching " << FLAGS_iter << " tasks using "
<< at::get_num_interop_threads() << " threads "
<< std::endl;
for (auto bench_iter = 0; bench_iter < FLAGS_benchmark_iter; ++bench_iter) {
start_time = clock::now();
launch_tasks_and_wait(FLAGS_iter);
duration = static_cast<float>(
std::chrono::duration_cast<ms>(clock::now() - start_time).count());
std::cout << "Time to run " << iter << " iterations "
<< (duration/1000.0) << " s." << std::endl;
}
return 0;
}
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