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amg4psblas/amgprec/impl/solver/amg_s_bwgs_solver_apply_vec...

213 lines
6.4 KiB
Fortran

!
!
! 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_bwgs_solver_apply_vect(alpha,sv,x,beta,y,desc_data,&
& trans,work,wv,info,init,initu)
use psb_base_mod
use amg_s_gs_solver, amg_protect_name => amg_s_bwgs_solver_apply_vect
implicit none
type(psb_desc_type), intent(in) :: desc_data
class(amg_s_bwgs_solver_type), intent(inout) :: sv
type(psb_s_vect_type),intent(inout) :: x
type(psb_s_vect_type),intent(inout) :: y
real(psb_spk_),intent(in) :: alpha,beta
character(len=1),intent(in) :: trans
real(psb_spk_),target, intent(inout) :: work(:)
type(psb_s_vect_type),intent(inout) :: wv(:)
integer(psb_ipk_), intent(out) :: info
character, intent(in), optional :: init
type(psb_s_vect_type),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(:)
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: np, me,i, err_act
character :: trans_, init_
character(len=20) :: name='s_bwgs_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 (x%get_nrows() < n_row) then
info = 36
call psb_errpush(info,name,&
& i_err=(/itwo,n_row,izero,izero,izero/))
goto 9999
end if
if (y%get_nrows() < n_row) then
info = 36
call psb_errpush(info,name,&
& i_err=(/ithree,n_row,izero,izero,izero/))
goto 9999
end if
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)
endif
else
allocate(ww(n_col),aux(4*n_col),stat=info)
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
if (size(wv) < 2) then
info = psb_err_internal_error_
call psb_errpush(info,name,&
& a_err='invalid wv size')
goto 9999
end if
associate(tw => wv(1), xit => wv(2))
itxst = 1
select case (init_)
case('Z')
call psb_geaxpby(sone,x,szero,tw,desc_data,info)
call psb_spsm(sone,sv%u,tw,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,tw,desc_data,info)
! Update with L. The off-diagonal block is taken care
! from the Jacobi smoother, hence this is purely local.
call psb_spmm(-sone,sv%l,xit,sone,tw,desc_data,info,doswap=.false.)
call psb_spsm(sone,sv%u,tw,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 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
end associate
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_bwgs_solver_apply_vect