Installation of MPI on Linux

There are 2 main implementations of MPI MPICH and Open MPI.
Below is the installation for open MPI.
For mpich See this link.

Type in a terminal:

Download the file below.

hello_world.f90

!  Fortran example  
   program hello
   include 'mpif.h'
   integer rank, size, ierror, tag, status(MPI_STATUS_SIZE)
 
   call MPI_INIT(ierror)
   call MPI_COMM_SIZE(MPI_COMM_WORLD, size, ierror)
   call MPI_COMM_RANK(MPI_COMM_WORLD, rank, ierror)
   print*, 'node', rank, ': Hello world'
   call MPI_FINALIZE(ierror)
   end

Type in a terminal:

It should display:

 node           0 : Hello world
 node           1 : Hello world
 node           2 : Hello world
 node           3 : Hello world