each process opens and writes to a different file.

/* multi_files.c -- each process opens and writes to a different file.
*
* Input: none
* Output: To file file.X, "Greetings from Process X", X = 0, 1, . . ., p-1
*
* See Chap 8, pp. 157 & ff in PPMPI
*/
#include
#include "mpi.h"

main(int argc, char* argv[]) {
FILE* my_fp;
int my_rank;
char filename[100];

MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
sprintf(filename,"file.%d", my_rank);
my_fp = fopen(filename, "w");

fprintf(my_fp, "Greetings from Process %d!\n",
my_rank);

fclose(my_fp);
MPI_Finalize();
}