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!
! $ f2py --f90exec=mpif90 -m helloworld -c helloworld.f90
!
subroutine sayhello(comm)
use mpi
implicit none
integer :: comm
integer :: rank, size, nlen, ierr
character (len=MPI_MAX_PROCESSOR_NAME) :: pname
if (comm == MPI_COMM_NULL) then
print *, 'You passed MPI_COMM_NULL !!!'
return
end if
call MPI_Comm_rank(comm, rank, ierr)
call MPI_Comm_size(comm, size, ierr)
call MPI_Get_processor_name(pname, nlen, ierr)
print *, 'Hello, World!', &
' I am process ', rank, &
' of ', size, &
' on ', pname(1:nlen), '.'
end subroutine sayhello
! program main
! use mpi
! implicit none
! integer ierr
! call MPI_Init(ierr)
! call sayhello(MPI_COMM_WORLD)
! call MPI_Finalize(ierr)
! end program main
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