! ! ! AMG4PSBLAS version 1.0 ! Algebraic Multigrid Package ! based on PSBLAS (Parallel Sparse BLAS version 3.7) ! ! (C) Copyright 2021 ! ! Salvatore Filippone ! Pasqua D'Ambra ! Daniela di Serafino ! ! Redistribution and use in source and binary forms, with or without ! modification, are permitted provided that the following conditions ! are met: ! 1. Redistributions of source code must retain the above copyright ! notice, this list of conditions and the following disclaimer. ! 2. Redistributions in binary form must reproduce the above copyright ! notice, this list of conditions, and the following disclaimer in the ! documentation and/or other materials provided with the distribution. ! 3. The name of the AMG4PSBLAS group or the names of its contributors may ! not be used to endorse or promote products derived from this ! software without specific written permission. ! ! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR ! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS ! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR ! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF ! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS ! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN ! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ! POSSIBILITY OF SUCH DAMAGE. ! ! subroutine amg_s_jac_solver_apply(alpha,sv,x,beta,y,desc_data,trans,& & work,info,init,initu) use psb_base_mod use amg_s_diag_solver use psb_base_krylov_conv_mod, only : log_conv use amg_s_jac_solver, amg_protect_name => amg_s_jac_solver_apply implicit none type(psb_desc_type), intent(in) :: desc_data class(amg_s_jac_solver_type), intent(inout) :: sv real(psb_spk_),intent(inout) :: x(:) real(psb_spk_),intent(inout) :: y(:) real(psb_spk_),intent(in) :: alpha,beta character(len=1),intent(in) :: trans real(psb_spk_),target, intent(inout) :: work(:) integer(psb_ipk_), intent(out) :: info character, intent(in), optional :: init real(psb_spk_),intent(inout), optional :: initu(:) ! integer(psb_ipk_) :: n_row,n_col, sweeps real(psb_spk_), pointer :: aux(:) type(psb_ctxt_type) :: ctxt integer(psb_ipk_) :: np, me, i, err_act character :: trans_, init_ real(psb_dpk_) :: res, resdenum character(len=20) :: name='s_jac_solver_apply_v' call psb_erractionsave(err_act) info = psb_success_ ctxt = desc_data%get_context() call psb_info(ctxt,me,np) if (present(init)) then init_ = psb_toupper(init) else init_='Z' end if trans_ = psb_toupper(trans) select case(trans_) case('N') case('T','C') case default call psb_errpush(psb_err_iarg_invalid_i_,name) goto 9999 end select n_row = desc_data%get_local_rows() n_col = desc_data%get_local_cols() sweeps = sv%sweeps if (4*n_col <= size(work)) then aux => work(:) else allocate(aux(4*n_col),stat=info) if (info /= psb_success_) then info=psb_err_alloc_request_ call psb_errpush(info,name,& & i_err=(/4*n_col,izero,izero,izero,izero/),& & a_err='real(psb_spk_)') goto 9999 end if endif if (sweeps >= 0) then ! ! This means we are dealing with a pure Jacobi smoother/solver. ! associate(tx => aux(1:n_col), ty => aux(n_col+1:2*n_col)) select case (init_) case('Z') call inner_mlt(n_row,sone,sv%dv%v%v,x,szero,ty,trans=trans_) case('Y') call psb_geaxpby(sone,x,szero,tx,desc_data,info) call psb_geaxpby(sone,y,szero,ty,desc_data,info) call psb_spmm(-sone,sv%a,ty,sone,tx,desc_data,info,& & work=aux,trans=trans_, doswap=.false.) call inner_mlt(n_row,sone,sv%dv%v%v,tx,szero,ty,trans=trans_) case('U') if (.not.present(initu)) then call psb_errpush(psb_err_internal_error_,name,& & a_err='missing initu to smoother_apply') goto 9999 end if call psb_geaxpby(sone,x,szero,tx,desc_data,info) call psb_geaxpby(sone,initu,szero,ty,desc_data,info) call psb_spmm(-sone,sv%a,ty,sone,tx,desc_data,info,& & work=aux,trans=trans_, doswap=.false.) call inner_mlt(n_row,sone,sv%dv%v%v,tx,szero,ty,trans=trans_) case default call psb_errpush(psb_err_internal_error_,name,& & a_err='wrong init to smoother_apply') goto 9999 end select do i=1, sweeps-1 ! ! Compute Y(j+1) = Y(j)+ D^(-1)*(X-A*Y(j)), ! where is the diagonal and A the matrix. ! call psb_geaxpby(sone,x,szero,tx,desc_data,info) call psb_spmm(-sone,sv%a,ty,sone,tx,desc_data,info,& & work=aux,trans=trans_, doswap=.false.) if (info /= psb_success_) exit call inner_mlt(n_row,sone,sv%dv%v%v,tx,sone,ty,trans=trans_) if (info /= psb_success_) exit end do if (info == psb_success_) call psb_geaxpby(alpha,ty,beta,y,desc_data,info) if (info /= psb_success_) then info=psb_err_internal_error_ call psb_errpush(info,name,& & a_err='subsolve with Jacobi sweeps > 1') goto 9999 end if end associate else info = psb_err_iarg_neg_ call psb_errpush(info,name,& & i_err=(/itwo,sweeps,izero,izero,izero/)) goto 9999 end if if (.not.(4*n_col <= size(work))) then deallocate(aux) endif call psb_erractionrestore(err_act) return 9999 call psb_error_handler(err_act) return contains subroutine inner_mlt(n_row,alpha,d,x,beta,y,trans) implicit none integer(psb_ipk_),intent(in) :: n_row real(psb_spk_), intent(inout) :: d(:) real(psb_spk_),intent(inout) :: x(:) real(psb_spk_),intent(inout) :: y(:) real(psb_spk_),intent(in) :: alpha,beta character(len=1),intent(in) :: trans integer(psb_ipk_) :: i if (trans_ == 'C') then if (beta == szero) then if (alpha == szero) then y(1:n_row) = szero else if (alpha == sone) then do i=1, n_row y(i) = (d(i)) * x(i) end do else if (alpha == -sone) then do i=1, n_row y(i) = -(d(i)) * x(i) end do else do i=1, n_row y(i) = alpha * (d(i)) * x(i) end do end if else if (beta == sone) then if (alpha == szero) then !y(1:n_row) = szero else if (alpha == sone) then do i=1, n_row y(i) = (d(i)) * x(i) + y(i) end do else if (alpha == -sone) then do i=1, n_row y(i) = -(d(i)) * x(i) + y(i) end do else do i=1, n_row y(i) = alpha * (d(i)) * x(i) + y(i) end do end if else if (beta == -sone) then if (alpha == szero) then y(1:n_row) = -y(1:n_row) else if (alpha == sone) then do i=1, n_row y(i) = (d(i)) * x(i) - y(i) end do else if (alpha == -sone) then do i=1, n_row y(i) = -(d(i)) * x(i) - y(i) end do else do i=1, n_row y(i) = alpha * (d(i)) * x(i) - y(i) end do end if else if (alpha == szero) then y(1:n_row) = beta *y(1:n_row) else if (alpha == sone) then do i=1, n_row y(i) = (d(i)) * x(i) + beta*y(i) end do else if (alpha == -sone) then do i=1, n_row y(i) = -(d(i)) * x(i) + beta*y(i) end do else do i=1, n_row y(i) = alpha * (d(i)) * x(i) + beta*y(i) end do end if end if else if (trans_ /= 'C') then if (beta == szero) then if (alpha == szero) then y(1:n_row) = szero else if (alpha == sone) then do i=1, n_row y(i) = d(i) * x(i) end do else if (alpha == -sone) then do i=1, n_row y(i) = -d(i) * x(i) end do else do i=1, n_row y(i) = alpha * d(i) * x(i) end do end if else if (beta == sone) then if (alpha == szero) then !y(1:n_row) = szero else if (alpha == sone) then do i=1, n_row y(i) = d(i) * x(i) + y(i) end do else if (alpha == -sone) then do i=1, n_row y(i) = -d(i) * x(i) + y(i) end do else do i=1, n_row y(i) = alpha * d(i) * x(i) + y(i) end do end if else if (beta == -sone) then if (alpha == szero) then y(1:n_row) = -y(1:n_row) else if (alpha == sone) then do i=1, n_row y(i) = d(i) * x(i) - y(i) end do else if (alpha == -sone) then do i=1, n_row y(i) = -d(i) * x(i) - y(i) end do else do i=1, n_row y(i) = alpha * d(i) * x(i) - y(i) end do end if else if (alpha == szero) then y(1:n_row) = beta *y(1:n_row) else if (alpha == sone) then do i=1, n_row y(i) = d(i) * x(i) + beta*y(i) end do else if (alpha == -sone) then do i=1, n_row y(i) = -d(i) * x(i) + beta*y(i) end do else do i=1, n_row y(i) = alpha * d(i) * x(i) + beta*y(i) end do end if end if end if end subroutine inner_mlt end subroutine amg_s_jac_solver_apply