Exercise E1:

• Implement the program empty.c and run it.
• Observe the process list with the top command issued in another shell (on a single processor machine only).
• What happens if you drop MPI_Init?
• What happens if you call MPI_Init twice?
• What happens if you drop MPI_Finalize?
  Don't use too many processes here and check your process list with ps -e.
• Print all command line parameters before and after the MPI_Init call. Run this modified program with
  > mpirun -np 5 a.out x y z
  Which process gets which parameters?

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