mpi_bash_light.cpp

#include <iostream>
#include <sstream>
#include <cstdlib>
#include <mpi.h>

int main(int argc, char* argv[]) {
  MPI_Init(&argc, &argv);

  if (argc < 2) {
    std::cerr << "# of arguments should be >= 2.\n";
    std::cerr << "argv[1] == script name.\n";
    std::cerr << "argv[l] (l >= 2) are target directory names.\n";
    std::exit(1);
  }

  int my_rank = -1;
  MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);

  std::stringstream ss;
  ss << "bash " << argv[1] << " " << my_rank; // $ bash script.bash rank                                                                                                                                            
  for (int i = 2; i < argc; i++) ss << " " << argv[i];
  system(ss.str().c_str()); // $ bash lstress_multi.bash rank dir0 dir1 dir2 ...                                                                                                                                    

  MPI_Barrier(MPI_COMM_WORLD);

  MPI_Finalize();
  return 0;
}