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amg4psblas/amgprec/impl/smoother/amg_z_jac_smoother_apply_ve...

322 lines
11 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
! 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_z_jac_smoother_apply_vect(alpha,sm,x,beta,y,desc_data,trans,&
& sweeps,work,wv,info,init,initu)
use psb_base_mod
use amg_z_diag_solver
use psb_base_krylov_conv_mod, only : log_conv
use amg_z_jac_smoother, amg_protect_name => amg_z_jac_smoother_apply_vect
implicit none
type(psb_desc_type), intent(in) :: desc_data
class(amg_z_jac_smoother_type), intent(inout) :: sm
type(psb_z_vect_type),intent(inout) :: x
type(psb_z_vect_type),intent(inout) :: y
complex(psb_dpk_),intent(in) :: alpha,beta
character(len=1),intent(in) :: trans
integer(psb_ipk_), intent(in) :: sweeps
complex(psb_dpk_),target, intent(inout) :: work(:)
type(psb_z_vect_type),intent(inout) :: wv(:)
integer(psb_ipk_), intent(out) :: info
character, intent(in), optional :: init
type(psb_z_vect_type),intent(inout), optional :: initu
!
integer(psb_ipk_) :: n_row,n_col
type(psb_z_vect_type) :: tx, ty, r
complex(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='z_jac_smoother_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
if (.not.allocated(sm%sv)) then
info = 1121
call psb_errpush(info,name)
goto 9999
end if
n_row = desc_data%get_local_rows()
n_col = desc_data%get_local_cols()
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='complex(psb_dpk_)')
goto 9999
end if
endif
if(sm%checkres) then
call psb_geall(r,desc_data,info)
call psb_geasb(r,desc_data,info)
resdenum = psb_genrm2(x,desc_data,info)
end if
if ((.not.sm%sv%is_iterative()).and.((sweeps == 1).or.(sm%nd_nnz_tot==0))) then
! if .not.sv%is_iterative, there's no need to pass init
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
select type (smsv => sm%sv)
class is (amg_z_diag_solver_type)
!
! This means we are dealing with a pure Jacobi smoother/solver.
!
associate(tx => wv(1), ty => wv(2))
select case (init_)
case('Z')
call sm%sv%apply(zone,x,zzero,ty,desc_data,trans_,aux,wv(3:),info,init='Z')
case('Y')
call psb_geaxpby(zone,x,zzero,tx,desc_data,info)
call psb_geaxpby(zone,y,zzero,ty,desc_data,info)
call psb_spmm(-zone,sm%pa,ty,zone,tx,desc_data,info,work=aux,trans=trans_)
call sm%sv%apply(zone,tx,zzero,ty,desc_data,trans_,aux,wv(3:),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(zone,x,zzero,tx,desc_data,info)
call psb_geaxpby(zone,initu,zzero,ty,desc_data,info)
call psb_spmm(-zone,sm%pa,ty,zone,tx,desc_data,info,work=aux,trans=trans_)
call sm%sv%apply(zone,tx,zzero,ty,desc_data,trans_,aux,wv(3:),info,init='Y')
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(zone,x,zzero,tx,desc_data,info)
call psb_spmm(-zone,sm%pa,ty,zone,tx,desc_data,info,work=aux,trans=trans_)
if (info /= psb_success_) exit
call sm%sv%apply(zone,tx,zone,ty,desc_data,trans_,aux,wv(3:),info,init='Y')
if (info /= psb_success_) exit
if ( sm%checkres.and.(mod(i,sm%checkiter) == 0) ) then
call psb_geaxpby(zone,x,zzero,r,desc_data,info)
call psb_spmm(-zone,sm%pa,ty,zone,r,desc_data,info)
res = psb_genrm2(r,desc_data,info)
if( sm%printres ) then
call log_conv("BJAC",me,i,sm%printiter,res,resdenum,sm%tol)
end if
if ( res < sm%tol*resdenum ) then
if( (sm%printres).and.(mod(sm%printiter,sm%checkiter)/=0) ) &
& call log_conv("BJAC",me,i,1,res,resdenum,sm%tol)
exit
end if
end if
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
class default
!
!
! Apply multiple sweeps of a block-Jacobi solver
! to compute an approximate solution of a linear system.
!
!
if (size(wv) < 2) then
info = psb_err_internal_error_
call psb_errpush(info,name,&
& a_err='invalid wv size in smoother_apply')
goto 9999
end if
associate(tx => wv(1), ty => wv(2))
!
! Unroll the first iteration and fold it inside SELECT CASE
! this will save one AXPBY and one SPMM when INIT=Z, and will be
! significant when sweeps=1 (a common case)
!
select case (init_)
case('Z')
call sm%sv%apply(zone,x,zzero,ty,desc_data,trans_,aux,wv(3:),info,init='Z')
case('Y')
call psb_geaxpby(zone,x,zzero,tx,desc_data,info)
call psb_geaxpby(zone,y,zzero,ty,desc_data,info)
call psb_spmm(-zone,sm%nd,ty,zone,tx,desc_data,info,work=aux,trans=trans_)
call sm%sv%apply(zone,tx,zzero,ty,desc_data,trans_,aux,wv(3:),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(zone,x,zzero,tx,desc_data,info)
call psb_geaxpby(zone,initu,zzero,ty,desc_data,info)
call psb_spmm(-zone,sm%nd,ty,zone,tx,desc_data,info,work=aux,trans=trans_)
call sm%sv%apply(zone,tx,zzero,ty,desc_data,trans_,aux,wv(3:),info,init='Y')
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) = 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.
!
call psb_geaxpby(zone,x,zzero,tx,desc_data,info)
call psb_spmm(-zone,sm%nd,ty,zone,tx,desc_data,info,work=aux,trans=trans_)
if (info /= psb_success_) exit
call sm%sv%apply(zone,tx,zzero,ty,desc_data,trans_,aux,wv(3:),info,init='Y')
if (info /= psb_success_) exit
if ( sm%checkres.and.(mod(i,sm%checkiter) == 0) ) then
call psb_geaxpby(zone,x,zzero,r,r,desc_data,info)
call psb_spmm(-zone,sm%pa,ty,zone,r,desc_data,info)
res = psb_genrm2(r,desc_data,info)
if( sm%printres ) then
call log_conv("BJAC",me,i,sm%printiter,res,resdenum,sm%tol)
end if
if (res < sm%tol*resdenum ) then
if( (sm%printres).and.( mod(sm%printiter,sm%checkiter) /=0 ) ) &
& call log_conv("BJAC",me,i,1,res,resdenum,sm%tol)
exit
end if
end if
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
end select
else
info = psb_err_iarg_neg_
call psb_errpush(info,name,&
& i_err=(/itwo,sweeps,izero,izero,izero/))
goto 9999
endif
if (.not.(4*n_col <= size(work))) then
deallocate(aux)
endif
if(sm%checkres) then
call psb_gefree(r,desc_data,info)
end if
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine amg_z_jac_smoother_apply_vect