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236 lines
7.7 KiB
Fortran
236 lines
7.7 KiB
Fortran
!
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!
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! AMG4PSBLAS version 1.0
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! Algebraic Multigrid Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.5)
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!
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! (C) Copyright 2020
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!
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! Salvatore Filippone
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! Pasqua D'Ambra
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! Fabio Durastante
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the AMG4PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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! POSSIBILITY OF SUCH DAMAGE.
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!
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!
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subroutine amg_z_as_smoother_apply(alpha,sm,x,beta,y,desc_data,trans,&
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& sweeps,work,info,init,initu)
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use psb_base_mod
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use amg_z_as_smoother, amg_protect_nam => amg_z_as_smoother_apply
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implicit none
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type(psb_desc_type), intent(in) :: desc_data
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class(amg_z_as_smoother_type), intent(inout) :: sm
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complex(psb_dpk_),intent(inout) :: x(:)
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complex(psb_dpk_),intent(inout) :: y(:)
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complex(psb_dpk_),intent(in) :: alpha,beta
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character(len=1),intent(in) :: trans
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integer(psb_ipk_), intent(in) :: sweeps
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complex(psb_dpk_),target, intent(inout) :: work(:)
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integer(psb_ipk_), intent(out) :: info
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character, intent(in), optional :: init
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complex(psb_dpk_),intent(inout), optional :: initu(:)
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integer(psb_ipk_) :: n_row,n_col, nrow_d, i
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complex(psb_dpk_), pointer :: aux(:)
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complex(psb_dpk_), allocatable :: tx(:),ty(:), ww(:)
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integer(psb_ipk_) :: ictxt,np,me, err_act,isz,int_err(5)
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character :: trans_, init_
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character(len=20) :: name='z_as_smoother_apply', ch_err
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call psb_erractionsave(err_act)
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info = psb_success_
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ictxt = desc_data%get_context()
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call psb_info(ictxt,me,np)
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if (present(init)) then
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init_ = psb_toupper(init)
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else
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init_='Z'
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end if
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trans_ = psb_toupper(trans)
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select case(trans_)
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case('N')
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case('T')
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case('C')
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case default
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call psb_errpush(psb_err_iarg_invalid_i_,name)
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goto 9999
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end select
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if (.not.allocated(sm%sv)) then
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info = 1121
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call psb_errpush(info,name)
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goto 9999
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end if
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n_row = sm%desc_data%get_local_rows()
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n_col = sm%desc_data%get_local_cols()
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nrow_d = desc_data%get_local_rows()
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isz = max(n_row,N_COL)
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if ((4*isz) <= size(work)) then
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aux => work(1:)
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else
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allocate(aux(4*isz),stat=info)
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if (info /= psb_success_) then
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call psb_errpush(psb_err_alloc_request_,name,&
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& i_err=(/4*isz,izero,izero,izero,izero/),&
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& a_err='complex(psb_dpk_)')
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goto 9999
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end if
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endif
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if ((.not.sm%sv%is_iterative()).and.(sweeps == 1).and.(sm%novr==0)) then
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!
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! Shortcut: in this case there is nothing else to be done.
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!
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call sm%sv%apply(alpha,x,beta,y,desc_data,trans_,aux,info)
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if (info /= psb_success_) then
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call psb_errpush(psb_err_internal_error_,name,&
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& a_err='Error in sub_aply Jacobi Sweeps = 1')
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goto 9999
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endif
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else if (sweeps >= 0) then
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!
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!
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! Apply multiple sweeps of an AS solver
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! to compute an approximate solution of a linear system.
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!
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!
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call psb_geasb(tx,sm%desc_data,info)
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call psb_geasb(ty,sm%desc_data,info)
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call psb_geasb(ww,sm%desc_data,info)
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!
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! Unroll the first iteration and fold it inside SELECT CASE
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! this will save one SPMM when INIT=Z, and will be
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! significant when sweeps=1 (a common case)
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!
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call psb_geaxpby(zone,x,zzero,tx,desc_data,info)
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if (info == 0) call sm%apply_restr(tx,trans_,aux,info)
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if (info == 0) call psb_geaxpby(zone,tx,zzero,ww,sm%desc_data,info)
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select case (init_)
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case('Z')
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call sm%sv%apply(zone,ww,zzero,ty,sm%desc_data,trans_,aux,info,init='Z')
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case('Y')
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call psb_geaxpby(zone,y,zzero,ty,desc_data,info)
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if (info == 0) call sm%apply_restr(ty,trans_,aux,info)
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if (info == 0) call psb_spmm(-zone,sm%nd,ty,zone,ww,sm%desc_data,info,&
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& work=aux,trans=trans_)
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call sm%sv%apply(zone,ww,zzero,ty,desc_data,trans_,aux,info,init='Y')
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case('U')
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if (.not.present(initu)) then
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call psb_errpush(psb_err_internal_error_,name,&
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& a_err='missing initu to smoother_apply')
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goto 9999
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end if
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call psb_geaxpby(zone,initu,zzero,ty,desc_data,info)
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if (info == 0) call sm%apply_restr(ty,trans_,aux,info)
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if (info == 0) call psb_spmm(-zone,sm%nd,ty,zone,ww,sm%desc_data,info,&
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& work=aux,trans=trans_)
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call sm%sv%apply(zone,ww,zzero,ty,desc_data,trans_,aux,info,init='Y')
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case default
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call psb_errpush(psb_err_internal_error_,name,&
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& a_err='wrong init to smoother_apply')
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goto 9999
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end select
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if (info == 0) call sm%apply_prol(ty,trans_,aux,info)
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if (info /= psb_success_) then
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call psb_errpush(psb_err_internal_error_,name,&
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& a_err='Error in sub_aply Jacobi Sweeps = 1')
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goto 9999
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endif
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do i=1, sweeps-1
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!
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! Compute Y(j+1) = D^(-1)*(X-ND*Y(j)), where D and ND are the
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! block diagonal part and the remaining part of the local matrix
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! and Y(j) is the approximate solution at sweep j.
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!
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if (info == 0) call psb_geaxpby(zone,tx,zzero,ww,sm%desc_data,info)
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if (info == 0) call psb_spmm(-zone,sm%nd,ty,zone,ww,sm%desc_data,info,&
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& work=aux,trans=trans_)
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if (info /= psb_success_) exit
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call sm%sv%apply(zone,ww,zzero,ty,sm%desc_data,trans_,aux,info,init='Y')
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if (info /= psb_success_) exit
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if (info == 0) call sm%apply_prol(ty,trans_,aux,info)
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end do
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if (info /= psb_success_) then
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info=psb_err_internal_error_
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call psb_errpush(info,name,&
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& a_err='subsolve with Jacobi sweeps > 1')
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goto 9999
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end if
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!
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! Compute y = beta*y + alpha*ty (ty == K^(-1)*tx)
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!
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call psb_geaxpby(alpha,ty,beta,y,desc_data,info)
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else
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info = psb_err_iarg_neg_
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call psb_errpush(info,name,&
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& i_err=(/itwo,sweeps,izero,izero,izero/))
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goto 9999
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endif
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if (.not.(4*isz <= size(work))) then
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deallocate(aux,stat=info)
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endif
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if (info ==0) deallocate(ww,tx,ty,stat=info)
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if (info /= 0) then
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info = psb_err_alloc_dealloc_
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call psb_errpush(info,name)
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goto 9999
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end if
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(err_act)
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return
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end subroutine amg_z_as_smoother_apply
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