io1.c

The example for Boor USING MPI2

/* example of parallel Unix write into separate files */
#include "mpi.h"
#include <stdio.h>
#define BUFSIZE 100

int main(int argc, char *argv[])
{
    int i, myrank, buf[BUFSIZE];
    char filename[128];
    FILE *myfile;

    MPI_Init(&argc, &argv);
    MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
    for (i=0; i<BUFSIZE; i++)
	buf[i] = myrank * BUFSIZE + i;
    sprintf(filename, "testfile.%d", myrank);
    myfile = fopen(filename, "w");
    fwrite(buf, sizeof(int), BUFSIZE, myfile);
    fclose(myfile);
    MPI_Finalize();
    return 0;
}