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Enable executing mpas_atm_get_bdy_tend on GPUs #1277

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Enable executing mpas_atm_get_bdy_tend on GPUs #1277

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42 changes: 37 additions & 5 deletions src/core_atmosphere/dynamics/mpas_atm_boundaries.F
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Original file line number Diff line number Diff line change
Expand Up @@ -300,25 +300,57 @@ function mpas_atm_get_bdy_tend(clock, block, vertDim, horizDim, field, delta_t)
real (kind=RKIND), dimension(vertDim,horizDim+1) :: return_tend

type (mpas_pool_type), pointer :: lbc
integer, pointer :: idx
integer, pointer :: idx_ptr
real (kind=RKIND), dimension(:,:), pointer :: tend
real (kind=RKIND), dimension(:,:,:), pointer :: tend_scalars
integer :: ierr
integer :: idx, i, j


call mpas_pool_get_subpool(block % structs, 'lbc', lbc)

nullify(tend)
call mpas_pool_get_array(lbc, 'lbc_'//trim(field), tend, 1)

MPAS_ACC_TIMER_START('mpas_atm_get_bdy_tend [ACC_data_xfer]')
!$acc enter data create(return_tend)
if (associated(tend)) then
return_tend(:,:) = tend(:,:)
!$acc enter data copyin(tend)
else
call mpas_pool_get_array(lbc, 'lbc_scalars', tend_scalars, 1)
call mpas_pool_get_dimension(lbc, 'index_'//trim(field), idx)
!$acc enter data copyin(tend_scalars)

! Ensure the integer pointed to by idx_ptr is copied to the gpu device
call mpas_pool_get_dimension(lbc, 'index_'//trim(field), idx_ptr)
idx = idx_ptr
end if
MPAS_ACC_TIMER_STOP('mpas_atm_get_bdy_tend [ACC_data_xfer]')

return_tend(:,:) = tend_scalars(idx,:,:)
!$acc parallel default(present)
if (associated(tend)) then
!$acc loop gang vector collapse(2)
do j=1,horizDim+1
do i=1,vertDim
return_tend(i,j) = tend(i,j)
end do
end do
else
!$acc loop gang vector collapse(2)
do j=1,horizDim+1
do i=1,vertDim
return_tend(i,j) = tend_scalars(idx,i,j)
end do
end do
end if
!$acc end parallel

MPAS_ACC_TIMER_START('mpas_atm_get_bdy_tend [ACC_data_xfer]')
!$acc exit data copyout(return_tend)
if (associated(tend)) then
!$acc exit data delete(tend)
else
!$acc exit data delete(tend_scalars)
end if
MPAS_ACC_TIMER_STOP('mpas_atm_get_bdy_tend [ACC_data_xfer]')

end function mpas_atm_get_bdy_tend

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