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!=== COPYRIGHT AND LICENSE STATEMENT ===
!
! This file is part of the TensorProductMultigrid code.
!
! (c) The copyright relating to this work is owned jointly by the
! Crown, Met Office and NERC [2014]. However, it has been created
! with the help of the GungHo Consortium, whose members are identified
! at https://puma.nerc.ac.uk/trac/GungHo/wiki .
!
! Main Developer: Eike Mueller
!
! TensorProductMultigrid is free software: you can redistribute it and/or
! modify it under the terms of the GNU Lesser General Public License as
! published by the Free Software Foundation, either version 3 of the
! License, or (at your option) any later version.
!
! TensorProductMultigrid is distributed in the hope that it will be useful,
! but WITHOUT ANY WARRANTY; without even the implied warranty of
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! GNU Lesser General Public License for more details.
!
! You should have received a copy of the GNU Lesser General Public License
! along with TensorProductMultigrid (see files COPYING and COPYING.LESSER).
! If not, see <http://www.gnu.org/licenses/>.
!
!=== COPYRIGHT AND LICENSE STATEMENT ===
!==================================================================
!
! Geometric multigrid module for cell centred finite volume
! discretisation.
!
! Eike Mueller, University of Bath, Feb 2012
!
!==================================================================
module multigrid
Juan Escobar
committed
#ifndef MNH
use mpi
#else
use modd_mpif
Juan Escobar
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#endif
use parameters
use datatypes
use discretisation
use messages
use solver
use conjugategradient
use communication
use timer
implicit none
public::mg_parameters
public::mg_initialise
public::mg_finalise
public::mg_solve_mnh
public::mg_solve
public::measurehaloswap
public::REST_CELLAVERAGE
public::REST_KHALIL
public::PROL_CONSTANT
public::PROL_TRILINEAR
public::COARSEGRIDSOLVER_SMOOTHER
public::COARSEGRIDSOLVER_CG
private
! --- multigrid parameter constants ---
! restriction
integer, parameter :: REST_CELLAVERAGE = 1
integer, parameter :: REST_KHALIL = 2
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! prolongation method
integer, parameter :: PROL_CONSTANT = 1
integer, parameter :: PROL_TRILINEAR = 2
! Coarse grid solver
integer, parameter :: COARSEGRIDSOLVER_SMOOTHER = 1
integer, parameter :: COARSEGRIDSOLVER_CG = 2
! --- Multigrid parameters type ---
type mg_parameters
! Verbosity level
integer :: verbose
! Number of MG levels
integer :: n_lev
! First level where data is pulled together
integer :: lev_split
! Number of presmoothing steps
integer :: n_presmooth
! Number of postsmoothing steps
integer :: n_postsmooth
! Number of smoothing steps on coarsest level
integer :: n_coarsegridsmooth
! Prolongation (see PROL_... for allowed values)
integer :: prolongation
! Restriction (see RESTR_... for allowed values)
integer :: restriction
! Smoother (see SMOOTHER_... for allowed values)
integer :: smoother
! Relaxation factor
real(kind=rl) :: omega
! Smoother on coarse grid
integer :: coarsegridsolver
! ordering of grid points for smoother
integer :: ordering
end type mg_parameters
! --- Parameters ---
type(mg_parameters) :: mg_param
type(model_parameters) :: model_param
type(smoother_parameters) :: smoother_param
type(grid_parameters) :: grid_param
type(comm_parameters) :: comm_param
type(cg_parameters) :: cg_param
! --- Gridded and scalar data structures ---
! Solution vector
type(scalar3d), allocatable :: xu_mg(:,:)
! RHS vector
type(scalar3d), allocatable :: xb_mg(:,:)
type(scalar3d), allocatable :: xr_mg(:,:)
! --- Timer ---
type(time), allocatable, dimension(:,:) :: t_restrict
type(time), allocatable, dimension(:,:) :: t_prolongate
type(time), allocatable, dimension(:,:) :: t_residual
type(time), allocatable, dimension(:,:) :: t_addcorr
type(time), allocatable, dimension(:,:) :: t_smooth
type(time), allocatable, dimension(:,:) :: t_coarsesolve
type(time), allocatable, dimension(:,:) :: t_total
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logical :: Gmg_initialized = .FALSE.
contains
!==================================================================
! Initialise multigrid module, check and print out out parameters
!==================================================================
subroutine mg_initialise(grid_param_in, & ! Grid parameters
comm_param_in, & ! Comm parameters
model_param_in, & ! Model parameters
smoother_param_in, & ! Smoother parameters
mg_param_in, & ! Multigrid parameters
cg_param_in & ! CG parameters
)
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use discretisation, only : zt1d_discretisation_allocate3d
implicit none
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type(grid_parameters), intent(in) :: grid_param_in
type(comm_parameters), intent(in) :: comm_param_in
type(model_parameters), intent(in) :: model_param_in
type(smoother_parameters), intent(in) :: smoother_param_in
type(mg_parameters), intent(in) :: mg_param_in
type(cg_parameters), intent(in) :: cg_param_in
real(kind=rl) :: L, H
integer :: n, nz, m, nlocal
logical :: reduced_m
integer :: level
integer :: rank, ierr
integer, dimension(2) :: p_horiz
integer, parameter :: dim_horiz = 2
logical :: grid_active
integer :: ix_min, ix_max, iy_min, iy_max
integer :: icompx_min, icompx_max, &
icompy_min, icompy_max
integer :: halo_size
integer :: vertbc
character(len=32) :: t_label
real , dimension(:,:,:) , pointer , contiguous :: zxu_mg_st,zxb_mg_st,zxr_mg_st
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Gmg_initialized = .TRUE.
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if (i_am_master_mpi) &
write(STDOUT,*) '*** Initialising multigrid ***'
! Check that cell counts are valid
grid_param = grid_param_in
comm_param = comm_param_in
mg_param = mg_param_in
model_param = model_param_in
smoother_param = smoother_param_in
cg_param = cg_param_in
halo_size = comm_param%halo_size
vertbc = grid_param%vertbc
! Check parameters
if (grid_param%n < 2**(mg_param%n_lev-1) ) then
call fatalerror('Number of cells in x-/y- direction has to be at least 2^{n_lev-1}.')
endif
if (mod(grid_param%n,2**(mg_param%n_lev-1)) .ne. 0 ) then
call fatalerror('Number of cells in x-/y- direction is not a multiple of 2^{n_lev-1}.')
end if
if (i_am_master_mpi) &
write(STDOUT,*) ''
! Allocate memory for timers
allocate(t_smooth(mg_param%n_lev,0:pproc))
allocate(t_total(mg_param%n_lev,0:pproc))
allocate(t_restrict(mg_param%n_lev,0:pproc))
allocate(t_residual(mg_param%n_lev,0:pproc))
allocate(t_prolongate(mg_param%n_lev,0:pproc))
allocate(t_addcorr(mg_param%n_lev,0:pproc))
allocate(t_coarsesolve(mg_param%n_lev,0:pproc))
! Allocate memory for all levels and initialise fields
allocate(xu_mg(mg_param%n_lev,0:pproc))
allocate(xb_mg(mg_param%n_lev,0:pproc))
allocate(xr_mg(mg_param%n_lev,0:pproc))
n = grid_param%n
nlocal = n/(2**pproc)
nz = grid_param%nz
L = grid_param%L
H = grid_param%H
level = mg_param%n_lev
m = pproc
reduced_m = .false.
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!
call zt1d_discretisation_init(nlocal,nlocal,nz)
!
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! Work out local processor coordinates (this is necessary to identify
! global coordinates)
call mpi_comm_rank(MPI_COMM_HORIZ,rank,ierr)
call mpi_cart_coords(MPI_COMM_HORIZ,rank,dim_horiz,p_horiz,ierr)
if (i_am_master_mpi) then
write(STDOUT, &
'(" Global gridsize (x,y,z) (pproc = ",I4," ) : ",I8," x ",I8," x ",I8)') &
pproc, n, n, nz
end if
do while (level > 0)
if (i_am_master_mpi) &
write(STDOUT, &
'(" Local gridsize (x,y,z) on level ",I3," m = ",I4," : ",I8," x ",I8," x ",I8)') &
level, m, nlocal, nlocal, nz
if (nlocal < 1) then
call fatalerror('Number of grid points < 1')
end if
! Set sizes of computational grid (take care at boundaries)
if (p_horiz(1) == 0) then
icompy_min = 1
else
icompy_min = 1 - (halo_size - 1)
end if
if (p_horiz(2) == 0) then
icompx_min = 1
else
icompx_min = 1 - (halo_size - 1)
end if
if (p_horiz(1) == 2**pproc-1) then
icompy_max = nlocal
else
icompy_max = nlocal + (halo_size - 1)
end if
if (p_horiz(2) == 2**pproc-1) then
icompx_max = nlocal
else
icompx_max = nlocal + (halo_size - 1)
end if
! Allocate data
if (LUseO) then
allocate(xu_mg(level,m)%s(0:nz+1, &
1-halo_size:nlocal+halo_size, &
1-halo_size:nlocal+halo_size))
allocate(xb_mg(level,m)%s(0:nz+1, &
1-halo_size:nlocal+halo_size, &
1-halo_size:nlocal+halo_size))
allocate(xr_mg(level,m)%s(0:nz+1, &
1-halo_size:nlocal+halo_size, &
1-halo_size:nlocal+halo_size))
xu_mg(level,m)%s(:,:,:) = 0.0_rl
xb_mg(level,m)%s(:,:,:) = 0.0_rl
xr_mg(level,m)%s(:,:,:) = 0.0_rl
endif
if (LUseT) then
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allocate(zxu_mg_st(1-halo_size:nlocal+halo_size, &
1-halo_size:nlocal+halo_size, &
0:nz+1))
!$acc enter data create (zxu_mg_st)
xu_mg(level,m)%st => zxu_mg_st
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allocate(zxb_mg_st(1-halo_size:nlocal+halo_size, &
1-halo_size:nlocal+halo_size, &
0:nz+1))
!$acc enter data create (zxb_mg_st)
xb_mg(level,m)%st => zxb_mg_st
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allocate(zxr_mg_st(1-halo_size:nlocal+halo_size, &
1-halo_size:nlocal+halo_size, &
0:nz+1))
!$acc enter data create (zxr_mg_st)
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xr_mg(level,m)%st => zxr_mg_st
!$acc kernels
zxu_mg_st(:,:,:) = 0.0_rl
zxb_mg_st(:,:,:) = 0.0_rl
zxr_mg_st(:,:,:) = 0.0_rl
!$acc end kernels
endif
! NB: 1st coordinate is in the y-direction of the processor grid,
! second coordinate is in the x-direction (see comments in
! communication module)
iy_min = (p_horiz(1)/2**(pproc-m))*nlocal+1
iy_max = (p_horiz(1)/2**(pproc-m)+1)*nlocal
ix_min = p_horiz(2)/2**(pproc-m)*nlocal+1
ix_max = (p_horiz(2)/2**(pproc-m)+1)*nlocal
! Set grid parameters and local data ranges
! Note that only n (and possibly nz) change as we
! move down the levels
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xu_mg(level,m)%grid_param%L = L
xu_mg(level,m)%grid_param%H = H
xu_mg(level,m)%grid_param%n = n
xu_mg(level,m)%grid_param%nz = nz
xu_mg(level,m)%grid_param%vertbc = vertbc
xu_mg(level,m)%ix_min = ix_min
xu_mg(level,m)%ix_max = ix_max
xu_mg(level,m)%iy_min = iy_min
xu_mg(level,m)%iy_max = iy_max
xu_mg(level,m)%icompx_min = icompx_min
xu_mg(level,m)%icompx_max = icompx_max
xu_mg(level,m)%icompy_min = icompy_min
xu_mg(level,m)%icompy_max = icompy_max
xu_mg(level,m)%halo_size = halo_size
xb_mg(level,m)%grid_param%L = L
xb_mg(level,m)%grid_param%H = H
xb_mg(level,m)%grid_param%n = n
xb_mg(level,m)%grid_param%nz = nz
xb_mg(level,m)%grid_param%vertbc = vertbc
xb_mg(level,m)%ix_min = ix_min
xb_mg(level,m)%ix_max = ix_max
xb_mg(level,m)%iy_min = iy_min
xb_mg(level,m)%iy_max = iy_max
xb_mg(level,m)%icompx_min = icompx_min
xb_mg(level,m)%icompx_max = icompx_max
xb_mg(level,m)%icompy_min = icompy_min
xb_mg(level,m)%icompy_max = icompy_max
xb_mg(level,m)%halo_size = halo_size
xr_mg(level,m)%grid_param%L = L
xr_mg(level,m)%grid_param%H = H
xr_mg(level,m)%grid_param%n = n
xr_mg(level,m)%grid_param%nz = nz
xr_mg(level,m)%grid_param%vertbc = vertbc
xr_mg(level,m)%ix_min = ix_min
xr_mg(level,m)%ix_max = ix_max
xr_mg(level,m)%iy_min = iy_min
xr_mg(level,m)%iy_max = iy_max
xr_mg(level,m)%icompx_min = icompx_min
xr_mg(level,m)%icompx_max = icompx_max
xr_mg(level,m)%icompy_min = icompy_min
xr_mg(level,m)%icompy_max = icompy_max
xr_mg(level,m)%halo_size = halo_size
! Are these grids active?
if ( (m == pproc) .or. &
( (mod(p_horiz(1),2**(pproc-m)) == 0) .and. &
(mod(p_horiz(2),2**(pproc-m)) == 0) ) ) then
grid_active = .true.
else
grid_active = .false.
end if
xu_mg(level,m)%isactive = grid_active
xb_mg(level,m)%isactive = grid_active
xr_mg(level,m)%isactive = grid_active
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write(t_label,'("t_total(",I3,",",I3,")")') level, m
call initialise_timer(t_total(level,m),t_label)
write(t_label,'("t_smooth(",I3,",",I3,")")') level, m
call initialise_timer(t_smooth(level,m),t_label)
write(t_label,'("t_restrict(",I3,",",I3,")")') level, m
call initialise_timer(t_restrict(level,m),t_label)
write(t_label,'("t_residual(",I3,",",I3,")")') level, m
call initialise_timer(t_residual(level,m),t_label)
write(t_label,'("t_prolongate(",I3,",",I3,")")') level, m
call initialise_timer(t_prolongate(level,m),t_label)
write(t_label,'("t_addcorrection(",I3,",",I3,")")') level, m
call initialise_timer(t_addcorr(level,m),t_label)
write(t_label,'("t_coarsegridsolver(",I3,",",I3,")")') level, m
call initialise_timer(t_coarsesolve(level,m),t_label)
! If we are below L_split, split data
if ( (level .le. mg_param%lev_split) .and. &
(m > 0) .and. (.not. reduced_m) ) then
reduced_m = .true.
m = m-1
nlocal = 2*nlocal
cycle
end if
reduced_m = .false.
level = level-1
n = n/2
nlocal = nlocal/2
end do
if (i_am_master_mpi) &
write(STDOUT,*) ''
call cg_initialise(cg_param)
end subroutine mg_initialise
!==================================================================
! Finalise, free memory for all data structures
!==================================================================
subroutine mg_finalise()
implicit none
integer :: level, m
logical :: reduced_m
character(len=80) :: s
integer :: ierr
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If ( .not. Gmg_initialized ) return
if (i_am_master_mpi) &
write(STDOUT,*) '*** Finalising multigrid ***'
! Deallocate memory
level = mg_param%n_lev
m = pproc
reduced_m = .false.
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!if (mg_param%verbose >= 0 )
call print_timerinfo("--- V-cycle timing results ---")
do while (level > 0)
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if (mg_param%verbose >= 10 ) then
write(s,'("level = ",I3,", m = ",I3)') level,m
call print_timerinfo(s)
call print_elapsed(t_smooth(level,m),.True.,1.0_rl)
call print_elapsed(t_restrict(level,m),.True.,1.0_rl)
call print_elapsed(t_prolongate(level,m),.True.,1.0_rl)
call print_elapsed(t_residual(level,m),.True.,1.0_rl)
call print_elapsed(t_addcorr(level,m),.True.,1.0_rl)
call print_elapsed(t_coarsesolve(level,m),.True.,1.0_rl)
call print_elapsed(t_total(level,m),.True.,1.0_rl)
endif
if (LUseO) then
deallocate(xu_mg(level,m)%s)
deallocate(xb_mg(level,m)%s)
deallocate(xr_mg(level,m)%s)
endif
if (LUseT) then
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!$acc exit data delete(xu_mg(level,m)%st)
deallocate(xu_mg(level,m)%st)
!
!$acc exit data delete(xb_mg(level,m)%st)
deallocate(xb_mg(level,m)%st)
!
!$acc exit data delete(xr_mg(level,m)%st)
deallocate(xr_mg(level,m)%st)
endif
! If we are below L_split, split data
if ( (level .le. mg_param%lev_split) .and. &
(m > 0) .and. (.not. reduced_m) ) then
reduced_m = .true.
m = m-1
cycle
end if
reduced_m = .false.
level = level-1
end do
deallocate(xu_mg)
deallocate(xb_mg)
deallocate(xr_mg)
deallocate(t_total)
deallocate(t_smooth)
deallocate(t_restrict)
deallocate(t_prolongate)
deallocate(t_residual)
deallocate(t_addcorr)
deallocate(t_coarsesolve)
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!if ( (i_am_master_mpi) ) write(STDOUT,'("")')
if ( (i_am_master_mpi) .and. (mg_param%verbose >= 10) ) write(STDOUT,'("")')
end subroutine mg_finalise
!==================================================================
! Restrict from fine -> coarse
!==================================================================
subroutine restrict_mnh(phifine,phicoarse)
implicit none
type(scalar3d), intent(in) :: phifine
type(scalar3d), intent(inout) :: phicoarse
! local var
integer :: ix,iy,iz
integer :: ix_min, ix_max, iy_min, iy_max, n ,nz
real(kind=rl) :: xn,xs,xw,xe
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real , dimension(:,:,:) , pointer , contiguous :: zphifine_st , zphicoarse_st
n = phicoarse%grid_param%n
ix_min = phicoarse%icompx_min
ix_max = phicoarse%icompx_max
iy_min = phicoarse%icompy_min
iy_max = phicoarse%icompy_max
nz = phicoarse%grid_param%nz
! three dimensional cell average
if (mg_param%restriction == REST_CELLAVERAGE) then
! Do not coarsen in z-direction
if (LUseO) then
do ix=ix_min,ix_max
do iy=iy_min,iy_max
do iz=1,nz
phicoarse%s(iz,iy,ix) = &
phifine%s(iz ,2*iy ,2*ix ) + &
phifine%s(iz ,2*iy-1,2*ix ) + &
phifine%s(iz ,2*iy ,2*ix-1) + &
phifine%s(iz ,2*iy-1,2*ix-1)
end do
end do
end do
endif
if (LUseT) then
zphifine_st => phifine%st
zphicoarse_st => phicoarse%st
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!$acc kernels present_cr(zphifine_st,zphicoarse_st)
!$mnh_do_concurrent( ix=ix_min:ix_max, iy=iy_min:iy_max, iz=1:nz )
zphicoarse_st(ix,iy,iz) = &
zphifine_st(2*ix ,2*iy ,iz) + &
zphifine_st(2*ix ,2*iy-1,iz) + &
zphifine_st(2*ix-1,2*iy ,iz) + &
zphifine_st(2*ix-1,2*iy-1,iz)
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!$mnh_end_do()
!$acc end kernels
endif
elseif(mg_param%restriction == REST_KHALIL) then
if (LUseO) then
do ix=ix_min,ix_max
xw=1.0
xe=1.0
if (ix==1) xw=0.0
if (ix==n) xe=0.0
do iy=iy_min,iy_max
xs=1.0
xn=1.0
if (iy==1) xs=0.0
if (iy==n) xn=0.0
do iz=1,nz
phicoarse%s(iz,iy,ix) = 0.25_rl * ( &
phifine%s(iz,2*iy+1,2*ix-1) * xn + &
phifine%s(iz,2*iy+1,2*ix ) * xn + &
phifine%s(iz,2*iy ,2*ix-2) * xw + &
phifine%s(iz,2*iy ,2*ix-1) * (4-xw-xn) + &
phifine%s(iz,2*iy ,2*ix ) * (4-xe-xn) + &
phifine%s(iz,2*iy ,2*ix+1) * xe + &
phifine%s(iz,2*iy-1,2*ix-2) * xw + &
phifine%s(iz,2*iy-1,2*ix-1) * (4-xw-xs) + &
phifine%s(iz,2*iy-1,2*ix ) * (4-xe-xs) + &
phifine%s(iz,2*iy-2,2*ix-1) * xs + &
phifine%s(iz,2*iy-2,2*ix ) * xs &
& )
end do
end do
end do
end if
if (LUseT) then
do iz=1,nz
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do iy=iy_min,iy_max
xs=1.0
xn=1.0
if (iy==1) xs=0.0
if (iy==n) xn=0.0
do ix=ix_min,ix_max
xw=1.0
xe=1.0
if (ix==1) xw=0.0
if (ix==n) xe=0.0
phicoarse%st(ix,iy,iz) = 0.25_rl * ( &
phifine%s(2*ix-1,2*iy+1,iz) * xn + &
phifine%s(2*ix ,2*iy+1,iz) * xn + &
phifine%s(2*ix-2,2*iy ,iz) * xw + &
phifine%s(2*ix-1,2*iy ,iz) * (4-xw-xn) + &
phifine%s(2*ix ,2*iy ,iz) * (4-xe-xn) + &
phifine%s(2*ix+1,2*iy ,iz) * xe + &
phifine%s(2*ix-2,2*iy-1,iz) * xw + &
phifine%s(2*ix-1,2*iy-1,iz) * (4-xw-xs) + &
phifine%s(2*ix ,2*iy-1,iz) * (4-xe-xs) + &
phifine%s(2*ix-1,2*iy-2,iz) * xs + &
phifine%s(2*ix ,2*iy-2,iz) * xs &
& )
end do
end do
end do
end if
end if
end subroutine restrict_mnh
!==================================================================
! Restrict from fine -> coarse
!==================================================================
subroutine restrict(phifine,phicoarse)
implicit none
type(scalar3d), intent(in) :: phifine
type(scalar3d), intent(inout) :: phicoarse
integer :: ix,iy,iz
integer :: ix_min, ix_max, iy_min, iy_max , nz
ix_min = phicoarse%icompx_min
ix_max = phicoarse%icompx_max
iy_min = phicoarse%icompy_min
iy_max = phicoarse%icompy_max
nz = phicoarse%grid_param%nz
! three dimensional cell average
if (mg_param%restriction == REST_CELLAVERAGE) then
! Do not coarsen in z-direction
if (LUseO) then
do ix=ix_min,ix_max
do iy=iy_min,iy_max
do iz=1,nz
phicoarse%s(iz,iy,ix) = &
phifine%s(iz ,2*iy ,2*ix ) + &
phifine%s(iz ,2*iy-1,2*ix ) + &
phifine%s(iz ,2*iy ,2*ix-1) + &
phifine%s(iz ,2*iy-1,2*ix-1)
end do
end do
end do
end if
if (LUseT) then
do iz=1,nz
do iy=iy_min,iy_max
do ix=ix_min,ix_max
phicoarse%st(ix,iy,iz) = &
phifine%st(2*ix ,2*iy ,iz) + &
phifine%st(2*ix ,2*iy-1,iz) + &
phifine%st(2*ix-1,2*iy ,iz) + &
phifine%st(2*ix-1,2*iy-1,iz)
end do
end do
end do
endif
end if
end subroutine restrict
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!==================================================================
! Prolongate from coarse -> fine
! level, m is the correspong to the fine grid level
!==================================================================
subroutine prolongate_mnh(level,m,phicoarse,phifine)
implicit none
integer, intent(in) :: level
integer, intent(in) :: m
type(scalar3d), intent(in) :: phicoarse
type(scalar3d), intent(inout) :: phifine
real(kind=rl) :: tmp
integer :: nlocal
integer, dimension(5) :: ixmin, ixmax, iymin, iymax
integer :: n, nz
integer :: ix, iy, iz
integer :: dix, diy, diz
real(kind=rl) :: rhox, rhoy, rhoz
real(kind=rl) :: rho_i, sigma_j, h, c1, c2
logical :: overlap_comms
integer, dimension(4) :: send_requests, recv_requests
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integer, dimension(4) :: send_requestsT, recv_requestsT
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integer :: ierr
integer :: iblock
! Needed for interpolation matrix
#ifdef PIECEWISELINEAR
#else
real(kind=rl) :: dx(4,3), A(3,3), dx_fine(4,2)
integer :: i,j,k
real(kind=rl) :: dxu(2), grad(2)
dx(1,3) = 1.0_rl
dx(2,3) = 1.0_rl
dx(3,3) = 1.0_rl
dx(4,3) = 1.0_rl
#endif
nlocal = phicoarse%ix_max-phicoarse%ix_min+1
n = phicoarse%grid_param%n
nz = phicoarse%grid_param%nz
#ifdef OVERLAPCOMMS
overlap_comms = (nlocal > 2)
#else
overlap_comms = .false.
#endif
! Block 1 (N)
ixmin(1) = 1
ixmax(1) = nlocal
iymin(1) = 1
iymax(1) = 1
! Block 2 (S)
ixmin(2) = 1
ixmax(2) = nlocal
iymin(2) = nlocal
iymax(2) = nlocal
! Block 3 (W)
ixmin(3) = 1
ixmax(3) = 1
iymin(3) = 2
iymax(3) = nlocal-1
! Block 4 (E)
ixmin(4) = nlocal
ixmax(4) = nlocal
iymin(4) = 2
iymax(4) = nlocal-1
! Block 5 (INTERIOR)
if (overlap_comms) then
ixmin(5) = 2
ixmax(5) = nlocal-1
iymin(5) = 2
iymax(5) = nlocal-1
else
! If there are no interior cells, do not overlap
! communications and calculations, just loop over interior cells
ixmin(5) = 1
ixmax(5) = nlocal
iymin(5) = 1
iymax(5) = nlocal
end if
! *** Constant prolongation or (tri-) linear prolongation ***
if ( (mg_param%prolongation == PROL_CONSTANT) .or. &
(mg_param%prolongation == PROL_TRILINEAR) ) then
if (overlap_comms) then
! Loop over cells next to boundary (iblock = 1,...,4)
do iblock = 1, 4
if (mg_param%prolongation == PROL_CONSTANT) then
call loop_over_grid_constant_mnh(iblock)
end if
if (mg_param%prolongation == PROL_TRILINEAR) then
call loop_over_grid_linear_mnh(iblock)
end if
end do
! Initiate halo exchange
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call ihaloswap_mnh(level,m,phifine,send_requests,recv_requests,send_requestsT,recv_requestsT)
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end if
! Loop over INTERIOR cells
iblock = 5
if (mg_param%prolongation == PROL_CONSTANT) then
call loop_over_grid_constant_mnh(iblock)
end if
if (mg_param%prolongation == PROL_TRILINEAR) then
call loop_over_grid_linear_mnh(iblock)
end if
if (overlap_comms) then
if (m > 0) then
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if (LUseO) call mpi_waitall(4,recv_requests, MPI_STATUSES_IGNORE, ierr)
if (LUseO) call mpi_waitall(4,send_requests, MPI_STATUSES_IGNORE, ierr)
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if (LUseT) call mpi_waitall(4,recv_requestsT, MPI_STATUSES_IGNORE, ierr)
if (LUseT) call mpi_waitall(4,send_requestsT, MPI_STATUSES_IGNORE, ierr)
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end if
else
call haloswap_mnh(level,m,phifine)
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end if
else
call fatalerror("Unsupported prolongation.")
end if
contains
!------------------------------------------------------------------
! The actual loops over the grid for the individual blocks,
! when overlapping calculation and communication
!------------------------------------------------------------------
!------------------------------------------------------------------
! (1) Constant interpolation
!------------------------------------------------------------------
subroutine loop_over_grid_constant_mnh(iblock)
implicit none
integer, intent(in) :: iblock
integer :: ix,iy,iz, nz
nz = phicoarse%grid_param%nz
if (LUseO) then
do ix=ixmin(iblock),ixmax(iblock)
do iy=iymin(iblock),iymax(iblock)
do dix = -1,0
do diy = -1,0
do iz=1,nz
phifine%s(iz,2*iy+diy,2*ix+dix) = phicoarse%s(iz,iy,ix)
end do
end do
end do
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end do
end do
end if
if (LUseT) then
do ix=ixmin(iblock),ixmax(iblock)
do iy=iymin(iblock),iymax(iblock)
do dix = -1,0
do diy = -1,0
do iz=1,nz
phifine%st(2*ix+dix,2*iy+diy,iz) = phicoarse%st(ix,iy,iz)
end do
end do
end do
end do
end do
end if
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end subroutine loop_over_grid_constant_mnh
!------------------------------------------------------------------
! (2) Linear interpolation
!------------------------------------------------------------------
subroutine loop_over_grid_linear_mnh(iblock)
implicit none
integer, intent(in) :: iblock
!local var
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integer :: ix,iy,iz
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real , dimension(:,:,:) , pointer , contiguous :: zphifine_st , zphicoarse_st
integer :: nz
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integer :: ix_min, ix_max, iy_min, iy_max
nz = phicoarse%grid_param%nz
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ix_min = ixmin(iblock)
ix_max = ixmax(iblock)
iy_min = iymin(iblock)
iy_max = iymax(iblock)
! optimisation for newman MNH case : all coef constant
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rhox = 0.25_rl
rhoy = 0.25_rl
if (LUseO) then
do ix=ixmin(iblock),ixmax(iblock)
do iy=iymin(iblock),iymax(iblock)
! Piecewise linear interpolation
do iz=1,nz
do dix = -1,0
do diy = -1,0
phifine%s(iz,2*iy+diy,2*ix+dix) = &
phicoarse%s(iz,iy,ix) + &
rhox*(phicoarse%s(iz,iy,ix+(2*dix+1)) &
- phicoarse%s(iz,iy,ix)) + &
rhoy*(phicoarse%s(iz,iy+(2*diy+1),ix) &
- phicoarse%s(iz,iy,ix))
end do
end do
end do
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end do
end do
end if
if (LUseT) then
! Piecewise linear interpolation
zphifine_st => phifine%st
zphicoarse_st => phicoarse%st
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!!!!!$acc kernels
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#ifdef MNH_COMPILER_NVHPC
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!!!!!$acc loop independent collapse(5)
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#endif
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!$acc parallel loop collapse(5)
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do diy = -1,0
do dix = -1,0
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!!!!DO CONCURRENT (ix=ix_min:ix_max, iy=iy_min:iy_max, iz=1:nz)
do iz=1,nz ; do iy=iy_min,iy_max; do ix=ix_min,ix_max;
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zphifine_st(2*ix+dix,2*iy+diy,iz) = &
zphicoarse_st(ix,iy,iz) + &
rhox*(zphicoarse_st(ix+(2*dix+1),iy,iz) &
- zphicoarse_st(ix,iy,iz)) + &
rhoy*(zphicoarse_st(ix,iy+(2*diy+1),iz) &
- zphicoarse_st(ix,iy,iz))
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end do; end do; end do
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end do
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!!!!!$acc end kernels
end if
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end subroutine loop_over_grid_linear_mnh
end subroutine prolongate_mnh
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!==================================================================
! Prolongate from coarse -> fine
! level, m is the correspong to the fine grid level
!==================================================================
subroutine prolongate(level,m,phicoarse,phifine)
implicit none
integer, intent(in) :: level
integer, intent(in) :: m
type(scalar3d), intent(in) :: phicoarse
type(scalar3d), intent(inout) :: phifine
real(kind=rl) :: tmp
integer :: nlocal
integer, dimension(5) :: ixmin, ixmax, iymin, iymax
integer :: n, nz
integer :: ix, iy, iz
integer :: dix, diy, diz
real(kind=rl) :: rhox, rhoy, rhoz
real(kind=rl) :: rho_i, sigma_j, h, c1, c2
logical :: overlap_comms
integer, dimension(4) :: send_requests, recv_requests
integer :: ierr
integer :: iblock
! Needed for interpolation matrix
#ifdef PIECEWISELINEAR
#else
real(kind=rl) :: dx(4,3), A(3,3), dx_fine(4,2)
integer :: i,j,k
real(kind=rl) :: dxu(2), grad(2)
dx(1,3) = 1.0_rl
dx(2,3) = 1.0_rl
dx(3,3) = 1.0_rl
dx(4,3) = 1.0_rl
#endif
nlocal = phicoarse%ix_max-phicoarse%ix_min+1
n = phicoarse%grid_param%n
nz = phicoarse%grid_param%nz
#ifdef OVERLAPCOMMS
overlap_comms = (nlocal > 2)
#else
overlap_comms = .false.
#endif
! Block 1 (N)
ixmin(1) = 1
ixmax(1) = nlocal
iymin(1) = 1
iymax(1) = 1
! Block 2 (S)
ixmin(2) = 1
ixmax(2) = nlocal
iymin(2) = nlocal
iymax(2) = nlocal
! Block 3 (W)
ixmin(3) = 1
ixmax(3) = 1
iymin(3) = 2
iymax(3) = nlocal-1
! Block 4 (E)
ixmin(4) = nlocal
ixmax(4) = nlocal
iymin(4) = 2
iymax(4) = nlocal-1
! Block 5 (INTERIOR)
if (overlap_comms) then
ixmin(5) = 2
ixmax(5) = nlocal-1
iymin(5) = 2
iymax(5) = nlocal-1
else
! If there are no interior cells, do not overlap
! communications and calculations, just loop over interior cells
ixmin(5) = 1
ixmax(5) = nlocal
iymin(5) = 1
iymax(5) = nlocal
end if
! *** Constant prolongation or (tri-) linear prolongation ***
if ( (mg_param%prolongation == PROL_CONSTANT) .or. &
(mg_param%prolongation == PROL_TRILINEAR) ) then
if (overlap_comms) then
! Loop over cells next to boundary (iblock = 1,...,4)
do iblock = 1, 4
if (mg_param%prolongation == PROL_CONSTANT) then
call loop_over_grid_constant(iblock)
end if
if (mg_param%prolongation == PROL_TRILINEAR) then
call loop_over_grid_linear(iblock)
end if
end do
! Initiate halo exchange
call ihaloswap(level,m,phifine,send_requests,recv_requests)
end if
! Loop over INTERIOR cells
iblock = 5
if (mg_param%prolongation == PROL_CONSTANT) then
call loop_over_grid_constant(iblock)
end if
if (mg_param%prolongation == PROL_TRILINEAR) then
call loop_over_grid_linear(iblock)
end if
if (overlap_comms) then
if (m > 0) then
call mpi_waitall(4,recv_requests, MPI_STATUSES_IGNORE, ierr)
end if
else
call haloswap(level,m,phifine)
end if
else
call fatalerror("Unsupported prolongation.")
end if
contains
!------------------------------------------------------------------
! The actual loops over the grid for the individual blocks,
! when overlapping calculation and communication
!------------------------------------------------------------------
!------------------------------------------------------------------