io2.c

The example for Boor USING MPI2

/* example of parallel MPI 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];
    MPI_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);
    MPI_File_open(MPI_COMM_SELF, filename,
		  MPI_MODE_WRONLY | MPI_MODE_CREATE,
		  MPI_INFO_NULL, &myfile);
    MPI_File_write(myfile, buf, BUFSIZE, MPI_INT,
		   MPI_STATUS_IGNORE);
    MPI_File_close(&myfile);
    MPI_Finalize();
    return 0;
}