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180 lines
5.2 KiB
Fortran
180 lines
5.2 KiB
Fortran
subroutine mld_d_ilu_solver_bld(a,desc_a,sv,upd,info,b,amold,vmold)
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use psb_base_mod
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use mld_d_ilu_solver, mld_protect_name => mld_d_ilu_solver_bld
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Implicit None
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! Arguments
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type(psb_dspmat_type), intent(in), target :: a
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Type(psb_desc_type), Intent(in) :: desc_a
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class(mld_d_ilu_solver_type), intent(inout) :: sv
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character, intent(in) :: upd
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integer, intent(out) :: info
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type(psb_dspmat_type), intent(in), target, optional :: b
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class(psb_d_base_sparse_mat), intent(in), optional :: amold
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class(psb_d_base_vect_type), intent(in), optional :: vmold
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! Local variables
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integer :: n_row,n_col, nrow_a, nztota
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!!$ real(psb_dpk_), pointer :: ww(:), aux(:), tx(:),ty(:)
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integer :: ictxt,np,me,i, err_act, debug_unit, debug_level
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character(len=20) :: name='d_ilu_solver_bld', ch_err
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info=psb_success_
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call psb_erractionsave(err_act)
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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ictxt = desc_a%get_context()
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call psb_info(ictxt, me, np)
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),' start'
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n_row = desc_a%get_local_rows()
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if (psb_toupper(upd) == 'F') then
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nrow_a = a%get_nrows()
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nztota = a%get_nzeros()
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if (present(b)) then
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nztota = nztota + b%get_nzeros()
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end if
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call sv%l%csall(n_row,n_row,info,nztota)
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if (info == psb_success_) call sv%u%csall(n_row,n_row,info,nztota)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_sp_all'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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if (allocated(sv%d)) then
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if (size(sv%d) < n_row) then
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deallocate(sv%d)
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endif
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endif
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if (.not.allocated(sv%d)) allocate(sv%d(n_row),stat=info)
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if (info /= psb_success_) then
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call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate')
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goto 9999
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endif
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select case(sv%fact_type)
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case (mld_ilu_t_)
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!
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! ILU(k,t)
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!
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select case(sv%fill_in)
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case(:-1)
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! Error: fill-in <= -1
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call psb_errpush(psb_err_input_value_invalid_i_,&
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& name,i_err=(/3,sv%fill_in,0,0,0/))
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goto 9999
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case(0:)
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! Fill-in >= 0
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call mld_ilut_fact(sv%fill_in,sv%thresh,&
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& a, sv%l,sv%u,sv%d,info,blck=b)
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end select
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='mld_ilut_fact'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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case(mld_ilu_n_,mld_milu_n_)
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!
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! ILU(k) and MILU(k)
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!
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select case(sv%fill_in)
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case(:-1)
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! Error: fill-in <= -1
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call psb_errpush(psb_err_input_value_invalid_i_,&
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& name,i_err=(/3,sv%fill_in,0,0,0/))
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goto 9999
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case(0)
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! Fill-in 0
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! Separate implementation of ILU(0) for better performance.
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! There seems to be a problem with the separate implementation of MILU(0),
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! contained into mld_ilu0_fact. This must be investigated. For the time being,
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! resort to the implementation of MILU(k) with k=0.
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if (sv%fact_type == mld_ilu_n_) then
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call mld_ilu0_fact(sv%fact_type,a,sv%l,sv%u,&
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& sv%d,info,blck=b,upd=upd)
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else
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call mld_iluk_fact(sv%fill_in,sv%fact_type,&
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& a,sv%l,sv%u,sv%d,info,blck=b)
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endif
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case(1:)
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! Fill-in >= 1
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! The same routine implements both ILU(k) and MILU(k)
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call mld_iluk_fact(sv%fill_in,sv%fact_type,&
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& a,sv%l,sv%u,sv%d,info,blck=b)
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end select
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='mld_iluk_fact'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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case default
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! If we end up here, something was wrong up in the call chain.
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info = psb_err_input_value_invalid_i_
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call psb_errpush(psb_err_input_value_invalid_i_,name,&
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& i_err=(/3,sv%fact_type,0,0,0/))
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goto 9999
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end select
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else
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! Here we should add checks for reuse of L and U.
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! For the time being just throw an error.
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info = 31
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call psb_errpush(info, name,&
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& i_err=(/3,0,0,0,0/),a_err=upd)
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goto 9999
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!
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! What is an update of a factorization??
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! A first attempt could be to reuse EXACTLY the existing indices
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! as if it was an ILU(0) (since, effectively, the sparsity pattern
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! should not grow beyond what is already there).
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!
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call mld_ilu0_fact(sv%fact_type,a,&
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& sv%l,sv%u,&
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& sv%d,info,blck=b,upd=upd)
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end if
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call sv%l%set_asb()
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call sv%l%trim()
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call sv%u%set_asb()
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call sv%u%trim()
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call sv%dv%bld(sv%d,mold=vmold)
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if (present(amold)) then
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call sv%l%cscnv(info,mold=amold)
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call sv%u%cscnv(info,mold=amold)
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end if
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if (debug_level >= psb_debug_outer_) &
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& write(debug_unit,*) me,' ',trim(name),' end'
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine mld_d_ilu_solver_bld
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