File: hello.f90

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openmpi 4.1.0-10
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!     Fortran example  
      program hello
      use mpi
      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