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program pario
use mpi
use, intrinsic :: iso_fortran_env, only : error_unit, output_unit
implicit none
integer, parameter :: datasize = 64, writer_id = 0
integer :: rc, my_id, ntasks, localsize, i
integer, dimension(:), allocatable :: localvector
integer, dimension(datasize) :: fullvector
call mpi_init(rc)
call mpi_comm_size(mpi_comm_world, ntasks, rc)
call mpi_comm_rank(mpi_comm_world, my_id, rc)
if (ntasks > 64) then
write(error_unit, *) 'Maximum number of tasks is 64!'
call mpi_abort(MPI_COMM_WORLD, -1, rc)
end if
if (mod(datasize, ntasks) /= 0) then
write(error_unit, *) 'Datasize (64) should be divisible by number of tasks'
call mpi_abort(MPI_COMM_WORLD, -1, rc)
end if
localsize = datasize / ntasks
allocate(localvector(localsize))
localvector = [(i + my_id * localsize, i=1,localsize)]
call single_reader()
call ordered_print()
deallocate(localvector)
call mpi_finalize(rc)
contains
subroutine single_reader()
implicit none
! TODO: Implement a function that will read the data from a file so that
! a single process does the file io. Use rank WRITER_ID as the io rank
end subroutine single_reader
subroutine ordered_print
implicit none
integer :: task
do task = 0, ntasks-1
if (my_id == task) then
write(output_unit, '(A,I0,A)', advance='no') 'Task ', &
& my_id, ' received:'
do i = 1, localsize
write(output_unit, '(I3)', advance='no') localvector(i)
end do
write(output_unit,*) ' '
end if
call mpi_barrier(MPI_COMM_WORLD, rc)
end do
end subroutine ordered_print
end program pario