I am trying to run two external program sequentially. The program runs fine till the first external program call and dont execute the second one.

The code is as below:

#include <stdio.h>
#include "mpi.h"

int main(int argc,char **argv)
{
int *buf, i, rank, nints, len;
char hostname[256];

MPI_Init(&argc,&argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);

MPI_Barrier(MPI_COMM_WORLD);
gethostname(hostname,255);
printf("Hello world! I am process number: %d on host %s\n", rank, hostname);
MPI_Barrier(MPI_COMM_WORLD);
execl("/bin/date", "date", NULL);
MPI_Barrier(MPI_COMM_WORLD);
execl("/bin/ls", "ls", NULL);
MPI_Barrier(MPI_COMM_WORLD);
MPI_Finalize();
return 0;
}

The output I am getting is as below:

Hello world! I am process number: 0 on host cluster
Hello world! I am process number: 1 on host cluster
Hello world! I am process number: 2 on host compute-0-1.local
Hello world! I am process number: 4 on host compute-0-2.local
Hello world! I am process number: 3 on host compute-0-1.local
Hello world! I am process number: 5 on host compute-0-2.local
Thu Oct 11 12:18:40 IST 2007
Thu Oct 11 12:18:40 IST 2007
Thu Oct 11 12:18:40 IST 2007
Thu Oct 11 12:18:40 IST 2007
Thu Oct 11 12:18:40 IST 2007
Thu Oct 11 12:18:40 IST 2007

I am very new to MPI programing, any suggestions would be highly appreciated.

Thanking you in advance.

Regards

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