! ! ! AMG4PSBLAS version 1.0 ! Algebraic Multigrid Package ! based on PSBLAS (Parallel Sparse BLAS version 3.7) ! ! (C) Copyright 2021 ! ! Salvatore Filippone ! Pasqua D'Ambra ! Fabio Durastante ! ! 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_gs_solver_apply(alpha,sv,x,beta,y,desc_data,& &trans,work,info,init,initu) use psb_base_mod use amg_s_gs_solver, amg_protect_name => amg_s_gs_solver_apply implicit none type(psb_desc_type), intent(in) :: desc_data class(amg_s_gs_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, itx, itxst real(psb_spk_), pointer :: ww(:), aux(:), tx(:),ty(:) real(psb_spk_), allocatable :: temp(:),wv(:),xit(:) type(psb_ctxt_type) :: ctxt integer(psb_ipk_) :: np, me, i, err_act character :: trans_, init_ character(len=20) :: name='s_gs_solver_apply' call psb_erractionsave(err_act) ctxt = desc_data%get_ctxt() call psb_info(ctxt,me,np) info = psb_success_ trans_ = psb_toupper(trans) select case(trans_) case('N') !!$ case('T') !!$ case('C') case default call psb_errpush(psb_err_iarg_invalid_i_,name) goto 9999 end select if (present(init)) then init_ = psb_toupper(init) else init_='Z' end if n_row = desc_data%get_local_rows() n_col = desc_data%get_local_cols() if (n_col <= size(work)) then ww => work(1:n_col) if ((4*n_col+n_col) <= size(work)) then aux => work(n_col+1:) 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 else allocate(ww(n_col),aux(4*n_col),stat=info) if (info /= psb_success_) then info=psb_err_alloc_request_ call psb_errpush(info,name,& & i_err=(/5*n_col,izero,izero,izero,izero/),& & a_err='real(psb_spk_)') goto 9999 end if endif if (info /= psb_success_) then info=psb_err_alloc_request_ call psb_errpush(info,name,& & i_err=(/5*n_col,izero,izero,izero,izero/),& & a_err='real(psb_spk_)') goto 9999 end if call psb_geasb(wv,desc_data,info) call psb_geasb(xit,desc_data,info) itxst = 1 select case (init_) case('Z') call psb_geaxpby(sone,x,szero,wv,desc_data,info) call psb_spsm(sone,sv%l,wv,szero,xit,desc_data,info) itxst = 2 case('Y') call psb_geaxpby(sone,y,szero,xit,desc_data,info) 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,initu,szero,xit,desc_data,info) case default call psb_errpush(psb_err_internal_error_,name,& & a_err='wrong init to smoother_apply') goto 9999 end select select case(trans_) case('N') if (sv%eps <=szero) then ! ! Fixed number of iterations ! ! do itx=itxst,sv%sweeps call psb_geaxpby(sone,x,szero,wv,desc_data,info) ! Update with U. The off-diagonal block is taken care ! from the Jacobi smoother, hence this is purely local. call psb_spmm(-sone,sv%u,xit,sone,wv,desc_data,info,doswap=.false.) call psb_spsm(sone,sv%l,wv,szero,xit,desc_data,info) end do call psb_geaxpby(alpha,xit,beta,y,desc_data,info) else ! ! Iterations to convergence, not implemented right now. ! info = psb_err_internal_error_ call psb_errpush(info,name,a_err='EPS>0 not implemented in GS subsolve') goto 9999 end if !!$ case('T') !!$ call psb_spsm(sone,sv%u,x,szero,wv,desc_data,info,& !!$ & trans=trans_,scale='L',diag=sv%dv,choice=psb_none_,work=aux) !!$ if (info == psb_success_) call psb_spsm(alpha,sv%l,wv,beta,y,desc_data,info,& !!$ & trans=trans_,scale='U',choice=psb_none_,work=aux) !!$ !!$ case('C') !!$ !!$ call psb_spsm(sone,sv%u,x,szero,wv,desc_data,info,& !!$ & trans=trans_,scale='U',choice=psb_none_,work=aux) !!$ !!$ call wv1%mlt(sone,sv%dv,wv,szero,info,conjgx=trans_) !!$ !!$ if (info == psb_success_) call psb_spsm(alpha,sv%l,wv1,beta,y,desc_data,info,& !!$ & trans=trans_,scale='U',choice=psb_none_,work=aux) case default info = psb_err_internal_error_ call psb_errpush(info,name,& & a_err='Invalid TRANS in GS subsolve') goto 9999 end select if (info /= psb_success_) then call psb_errpush(psb_err_internal_error_,name,& & a_err='Error in subsolve') goto 9999 endif if (n_col <= size(work)) then if ((4*n_col+n_col) <= size(work)) then else deallocate(aux) endif else deallocate(ww,aux) endif call psb_erractionrestore(err_act) return 9999 call psb_error_handler(err_act) return end subroutine amg_s_gs_solver_apply