! ! ! AMG4PSBLAS version 1.0 ! Algebraic Multigrid Package ! based on PSBLAS (Parallel Sparse BLAS version 3.5) ! ! (C) Copyright 2020 ! ! 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_c_as_smoother_apply_vect(alpha,sm,x,beta,y,desc_data,trans,& & sweeps,work,wv,info,init,initu) use psb_base_mod use amg_c_as_smoother, amg_protect_nam => amg_c_as_smoother_apply_vect implicit none type(psb_desc_type), intent(in) :: desc_data class(amg_c_as_smoother_type), intent(inout) :: sm type(psb_c_vect_type),intent(inout) :: x type(psb_c_vect_type),intent(inout) :: y complex(psb_spk_),intent(in) :: alpha,beta character(len=1),intent(in) :: trans integer(psb_ipk_), intent(in) :: sweeps complex(psb_spk_),target, intent(inout) :: work(:) type(psb_c_vect_type),intent(inout) :: wv(:) integer(psb_ipk_), intent(out) :: info character, intent(in), optional :: init type(psb_c_vect_type),intent(inout), optional :: initu integer(psb_ipk_) :: n_row,n_col, nrow_d, i complex(psb_spk_), pointer :: aux(:) type(psb_c_vect_type) :: tx, ty, ww integer(psb_ipk_) :: ictxt,np,me, err_act,isz,int_err(5) character :: trans_, init_ logical :: do_realloc_wv character(len=20) :: name='c_as_smoother_apply_v', ch_err call psb_erractionsave(err_act) info = psb_success_ ictxt = desc_data%get_context() call psb_info(ictxt,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') case('C') case default call psb_errpush(psb_err_iarg_invalid_i_,name) goto 9999 end select if (.not.allocated(sm%sv)) then info = 1121 call psb_errpush(info,name) goto 9999 end if n_row = sm%desc_data%get_local_rows() n_col = sm%desc_data%get_local_cols() nrow_d = desc_data%get_local_rows() isz = max(n_row,N_COL) if (4*isz <= size(work)) then aux => work(:) else allocate(aux(4*isz),stat=info) if (info /= psb_success_) then call psb_errpush(psb_err_alloc_request_,name,& & i_err=(/4*isz,izero,izero,izero,izero/),& & a_err='complex(psb_spk_)') goto 9999 end if endif if ((.not.sm%sv%is_iterative()).and.(sweeps == 1).and.(sm%novr==0)) then ! ! Shortcut: in this case there is nothing else to be done. ! call sm%sv%apply(alpha,x,beta,y,desc_data,trans_,aux,wv,info) if (info /= psb_success_) then call psb_errpush(psb_err_internal_error_,name,& & a_err='Error in sub_aply Jacobi Sweeps = 1') goto 9999 endif else if (sweeps >= 0) then ! ! ! Apply multiple sweeps of an AS solver ! to compute an approximate solution of a linear system. ! ! if (size(wv) < 3) then call psb_errpush(psb_err_internal_error_,name,& & a_err='invalid wv size in smoother_apply') goto 9999 end if ! ! This is tricky. This smoother has a descriptor sm%desc_data ! for an index space potentially different from ! that of desc_data. Hence the size of the work vectors ! could be wrong. We need to check and reallocate as needed. ! do_realloc_wv = (wv(1)%get_nrows() < sm%desc_data%get_local_cols()).or.& & (wv(2)%get_nrows() < sm%desc_data%get_local_cols()).or.& & (wv(3)%get_nrows() < sm%desc_data%get_local_cols()) if (do_realloc_wv) then call psb_geasb(wv(1),sm%desc_data,info,scratch=.true.,mold=wv(2)%v) call psb_geasb(wv(2),sm%desc_data,info,scratch=.true.,mold=wv(1)%v) call psb_geasb(wv(3),sm%desc_data,info,scratch=.true.,mold=wv(1)%v) end if associate(tx => wv(1), ty => wv(2), ww => wv(3)) ! Need to zero tx because of the apply_restr call. call tx%zero() ! ! Unroll the first iteration and fold it inside SELECT CASE ! this will save one SPMM when INIT=Z, and will be ! significant when sweeps=1 (a common case) ! call psb_geaxpby(cone,x,czero,tx,desc_data,info) if (info == 0) call sm%apply_restr(tx,trans_,aux,info) if (info == 0) call psb_geaxpby(cone,tx,czero,ww,sm%desc_data,info) select case (init_) case('Z') call sm%sv%apply(cone,ww,czero,ty,sm%desc_data,trans_,aux,wv(4:),info,init='Z') case('Y') call psb_geaxpby(cone,y,czero,ty,desc_data,info) if (info == 0) call sm%apply_restr(ty,trans_,aux,info) if (info == 0) call psb_spmm(-cone,sm%nd,ty,cone,ww,sm%desc_data,info,& & work=aux,trans=trans_) call sm%sv%apply(cone,ww,czero,ty,desc_data,trans_,aux,wv(4:),info,init='Y') 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(cone,initu,czero,ty,desc_data,info) if (info == 0) call sm%apply_restr(ty,trans_,aux,info) if (info == 0) call psb_spmm(-cone,sm%nd,ty,cone,ww,sm%desc_data,info,& & work=aux,trans=trans_) call sm%sv%apply(cone,ww,czero,ty,desc_data,trans_,aux,wv(4:),info,init='Y') case default call psb_errpush(psb_err_internal_error_,name,& & a_err='wrong init to smoother_apply') goto 9999 end select if (info == 0) call sm%apply_prol(ty,trans_,aux,info) if (info /= psb_success_) then call psb_errpush(psb_err_internal_error_,name,& & a_err='Error in sub_aply Jacobi Sweeps = 1') goto 9999 endif do i=1, sweeps-1 ! ! Compute Y(j+1) = D^(-1)*(X-ND*Y(j)), where D and ND are the ! block diagonal part and the remaining part of the local matrix ! and Y(j) is the approximate solution at sweep j. ! if (info == 0) call psb_geaxpby(cone,tx,czero,ww,sm%desc_data,info) if (info == 0) call psb_spmm(-cone,sm%nd,ty,cone,ww,sm%desc_data,info,& & work=aux,trans=trans_) if (info /= psb_success_) exit call sm%sv%apply(cone,ww,czero,ty,sm%desc_data,trans_,aux,wv(4:),info,init='Y') if (info /= psb_success_) exit if (info == 0) call sm%apply_prol(ty,trans_,aux,info) end do 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 ! ! Compute y = beta*y + alpha*ty (ty == K^(-1)*tx) ! call psb_geaxpby(alpha,ty,beta,y,desc_data,info) end associate else info = psb_err_iarg_neg_ call psb_errpush(info,name,& & i_err=(/itwo,sweeps,izero,izero,izero/)) goto 9999 endif if (.not.(4*isz <= size(work))) then deallocate(aux,stat=info) endif if (info /= 0) then info = psb_err_alloc_dealloc_ call psb_errpush(info,name) goto 9999 end if call psb_erractionrestore(err_act) return 9999 call psb_error_handler(err_act) return end subroutine amg_c_as_smoother_apply_vect