MPI programs dont run on MIC's across nodes or within the nodes

I am using the intel MIC to run sample MPI programs currently.

The program is a simple hello world program.

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

int main (argc, argv)
     int argc;
     char *argv[];
{
  int rank, size,len;
  char name[MPI_MAX_PROCESSOR_NAME];

  MPI_Init (&argc, &argv);      /* starts MPI */
  MPI_Comm_rank (MPI_COMM_WORLD, &rank);        /* get current process id */
  MPI_Comm_size (MPI_COMM_WORLD, &size);        /* get number of processes */
  MPI_Get_processor_name(name,&len);
  printf( "Hello world from process %d of %d with name as %s\n", rank, size,name );
  MPI_Finalize();
  return 0;
}

i compiled the program using hostfile option. mpirun -f machinefile -n 4 ./a.out

The contents of the machinefile is 

cat machinefile
node1-mic0
node1-mic1

And the output i get is

Hello world from process 1 of 4 with name as node1-mic0
Hello world from process 2 of 4 with name as node1-mic0
Hello world from process 3 of 4 with name as node1-mic0
Hello world from process 0 of 4 with name as node1-mic0

However when i force the the program to split across the Intel MIC's, using the -ppn option, i encountered the following problem.

   mpirun -f machinefile -n 4 -ppn 2 ./a.out 

=====================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   EXIT CODE: 11
=   CLEANING UP REMAINING PROCESSES
=   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
=====================================================================================
APPLICATION TERMINATED WITH THE EXIT STRING: Segmentation fault (signal 11)