auto tbeg = std::chrono::steady_clock::now();

for(int i=0; i<N; ++i) {

printf("fib[%d]=%d\n", i, fib(i));

}

auto tend = std::chrono::steady_clock::now();

std::cout << "sequential version takes "

<< std::chrono::duration_cast<std::chrono::milliseconds>(tend-tbeg).count()

<< " ms\n";

std::vector<int> range(N);

std::iota(range.begin(), range.end(), 0);

auto tbeg = std::chrono::steady_clock::now();

tf::Taskflow tf;

tf.parallel_for(range, [&] (const int i) {

printf("fib[%d]=%d\n", i, fib(i));

});

tf.wait_for_all();

auto tend = std::chrono::steady_clock::now();

std::cout << "taskflow version takes "

<< std::chrono::duration_cast<std::chrono::milliseconds>(tend-tbeg).count()

<< " ms\n";

std::vector<int> range(N);

std::iota(range.begin(), range.end(), 0);

auto tbeg = std::chrono::steady_clock::now();

#pragma omp parallel for

for(int i=0; i<N; ++i) {

printf("fib[%d]=%d\n", range[i], fib(range[i]));

}

auto tend = std::chrono::steady_clock::now();

std::cout << "openmp version takes "

<< std::chrono::duration_cast<std::chrono::milliseconds>(tend-tbeg).count()

<< " ms\n";

if(argc != 3) {

std::cerr << "usage: ./parallel_for [baseline|openmp|taskflow] N\n";

std::exit(EXIT_FAILURE);

}

// Run methods

if(std::string_view method(argv[1]); method == "baseline") {

sequential(std::atoi(argv[2]));

}

else if(method == "openmp") {

openmp(std::atoi(argv[2]));

}

else if(method == "taskflow") {

taskflow(std::atoi(argv[2]));

}

else {

std::cerr << "wrong method, shoud be [baseline|openmp|taskflow]\n";

}

return 0;