! ! ! 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_d_jac_solver_apply_vect(alpha,sv,x,beta,y,desc_data,trans,& & work,wv,info,init,initu) use psb_base_mod use amg_d_diag_solver use psb_base_krylov_conv_mod, only : log_conv use amg_d_jac_solver, amg_protect_name => amg_d_jac_solver_apply_vect implicit none type(psb_desc_type), intent(in) :: desc_data class(amg_d_jac_solver_type), intent(inout) :: sv type(psb_d_vect_type),intent(inout) :: x type(psb_d_vect_type),intent(inout) :: y real(psb_dpk_),intent(in) :: alpha,beta character(len=1),intent(in) :: trans real(psb_dpk_),target, intent(inout) :: work(:) type(psb_d_vect_type),intent(inout) :: wv(:) integer(psb_ipk_), intent(out) :: info character, intent(in), optional :: init type(psb_d_vect_type),intent(inout), optional :: initu ! integer(psb_ipk_) :: n_row,n_col, sweeps type(psb_d_vect_type) :: tx, ty, r real(psb_dpk_), 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='d_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_dpk_)') goto 9999 end if endif if (sweeps >= 0) then ! ! This means we are dealing with a pure Jacobi smoother/solver. ! associate(tx => wv(1), ty => wv(2)) select case (init_) case('Z') call ty%mlt(done,sv%dv,x,dzero,info,conjgx=trans_) case('Y') call psb_geaxpby(done,x,dzero,tx,desc_data,info) call psb_geaxpby(done,y,dzero,ty,desc_data,info) call psb_spmm(-done,sv%a,ty,done,tx,desc_data,info,& & work=aux,trans=trans_, doswap=.false.) call ty%mlt(done,sv%dv,tx,dzero,info,conjgx=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(done,x,dzero,tx,desc_data,info) call psb_geaxpby(done,initu,dzero,ty,desc_data,info) call psb_spmm(-done,sv%a,ty,done,tx,desc_data,info,& & work=aux,trans=trans_, doswap=.false.) call ty%mlt(done,sv%dv,tx,dzero,info,conjgx=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(done,x,dzero,tx,desc_data,info) call psb_spmm(-done,sv%a,ty,done,tx,desc_data,info,& & work=aux,trans=trans_, doswap=.false.) if (info /= psb_success_) exit call ty%mlt(done,sv%dv,tx,done,info,conjgx=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 end subroutine amg_d_jac_solver_apply_vect