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44 | /*
* Copyright 2021 Jeisson Hidalgo-Cespedes - Universidad de Costa Rica
* Creates a secondary thread that greets in the standard output
*/
#include <mpi.h>
#include <omp.h>
#include <iostream>
int main(int argc, char* argv[]) {
if (MPI_Init(&argc, &argv) == MPI_SUCCESS) {
int my_rank = -1;
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
int process_count = -1;
MPI_Comm_size(MPI_COMM_WORLD, &process_count);
char hostname[MPI_MAX_PROCESSOR_NAME];
int hostname_len = -1;
MPI_Get_processor_name(hostname, &hostname_len);
std::cout << "Hello from main thread of process " << my_rank
<< " of " << process_count << " on " << hostname << std::endl;
int thread_count = omp_get_max_threads();
if (argc >= 2) {
thread_count = atoi(argv[1]);
}
#pragma omp parallel num_threads(thread_count)\
default(none) shared(std::cout, my_rank, process_count, hostname)
{
#pragma omp critical(cout)
std::cout << " Hello from thread " << omp_get_thread_num()
<< " of " << omp_get_num_threads() << " of process " << my_rank
<< " of " << process_count << " on " << hostname << std::endl;
}
MPI_Finalize();
} else {
std::cout << "Error: could not init MPI environment" << std::endl;
}
return 0;
}
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