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301 lines
7.9 KiB
Fortran
301 lines
7.9 KiB
Fortran
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subroutine mld_z_dec_map_bld(theta,a,desc_a,nlaggr,ilaggr,info)
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use psb_base_mod
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use mld_z_inner_mod, mld_protect_name => mld_z_dec_map_bld
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implicit none
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! Arguments
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type(psb_zspmat_type), intent(in) :: a
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type(psb_desc_type), intent(in) :: desc_a
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real(psb_dpk_), intent(in) :: theta
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integer, allocatable, intent(out) :: ilaggr(:),nlaggr(:)
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integer, intent(out) :: info
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! Local variables
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integer, allocatable :: ils(:), neigh(:), irow(:), icol(:)
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complex(psb_dpk_), allocatable :: val(:), diag(:)
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integer :: icnt,nlp,k,n,ia,isz,nr, naggr,i,j,m, nz
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real(psb_dpk_) :: cpling, tcl
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logical :: recovery
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integer :: debug_level, debug_unit
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integer :: ictxt,np,me,err_act
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integer :: nrow, ncol, n_ne
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character(len=20) :: name, ch_err
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if (psb_get_errstatus() /= 0) return
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info=psb_success_
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name = 'mld_dec_map_bld'
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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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!
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ictxt=desc_a%get_context()
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call psb_info(ictxt,me,np)
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nrow = desc_a%get_local_rows()
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ncol = desc_a%get_local_cols()
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nr = a%get_nrows()
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allocate(ilaggr(nr),neigh(nr),stat=info)
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if(info /= psb_success_) then
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info=psb_err_alloc_request_
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call psb_errpush(info,name,i_err=(/2*nr,0,0,0,0/),&
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& a_err='integer')
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goto 9999
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end if
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allocate(diag(nr),stat=info)
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if(info /= psb_success_) then
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info=psb_err_alloc_request_
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call psb_errpush(info,name,i_err=(/nr,0,0,0,0/),&
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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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call a%get_diag(diag,info)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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call psb_errpush(info,name,a_err='psb_sp_getdiag')
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goto 9999
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end if
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do i=1, nr
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ilaggr(i) = -(nr+1)
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end do
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! Note: -(nr+1) Untouched as yet
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! -i 1<=i<=nr Adjacent to aggregate i
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! i 1<=i<=nr Belonging to aggregate i
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!
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! Phase one: group nodes together.
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! Very simple minded strategy.
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!
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naggr = 0
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nlp = 0
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do
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icnt = 0
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do i=1, nr
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if (ilaggr(i) == -(nr+1)) then
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!
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! 1. Untouched nodes are marked >0 together
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! with their neighbours
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!
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icnt = icnt + 1
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naggr = naggr + 1
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ilaggr(i) = naggr
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call a%csget(i,i,nz,irow,icol,val,info)
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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call psb_errpush(info,name,a_err='csget')
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goto 9999
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end if
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do k=1, nz
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j = icol(k)
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if ((1<=j).and.(j<=nr).and.(i /= j)) then
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if (abs(val(k)) > theta*sqrt(abs(diag(i)*diag(j)))) then
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ilaggr(j) = naggr
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else
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ilaggr(j) = -naggr
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endif
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end if
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enddo
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!
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! 2. Untouched neighbours of these nodes are marked <0.
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!
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call a%get_neigh(i,neigh,n_ne,info,lev=2)
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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call psb_errpush(info,name,a_err='psb_neigh')
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goto 9999
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end if
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do n = 1, n_ne
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m = neigh(n)
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if ((1<=m).and.(m<=nr)) then
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if (ilaggr(m) == -(nr+1)) ilaggr(m) = -naggr
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endif
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enddo
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endif
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enddo
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nlp = nlp + 1
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if (icnt == 0) exit
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enddo
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if (debug_level >= psb_debug_outer_) then
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write(debug_unit,*) me,' ',trim(name),&
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& ' Check 1:',count(ilaggr == -(nr+1))
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end if
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!
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! Phase two: sweep over leftovers.
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!
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allocate(ils(nr),stat=info)
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if(info /= psb_success_) then
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info=psb_err_alloc_request_
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call psb_errpush(info,name,i_err=(/naggr+10,0,0,0,0/),&
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& a_err='integer')
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goto 9999
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end if
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do i=1, size(ils)
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ils(i) = 0
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end do
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do i=1, nr
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n = ilaggr(i)
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if (n>0) then
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if (n>naggr) then
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info=psb_err_internal_error_
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call psb_errpush(info,name,a_err='loc_Aggregate: n > naggr 1 ?')
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goto 9999
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else
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ils(n) = ils(n) + 1
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end if
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end if
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end do
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if (debug_level >= psb_debug_outer_) then
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write(debug_unit,*) me,' ',trim(name),&
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& 'Phase 1: number of aggregates ',naggr
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write(debug_unit,*) me,' ',trim(name),&
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& 'Phase 1: nodes aggregated ',sum(ils)
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end if
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recovery=.false.
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do i=1, nr
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if (ilaggr(i) < 0) then
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!
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! Now some silly rule to break ties:
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! Group with adjacent aggregate.
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!
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isz = nr+1
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ia = -1
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cpling = dzero
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call a%csget(i,i,nz,irow,icol,val,info)
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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call psb_errpush(info,name,a_err='psb_sp_getrow')
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goto 9999
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end if
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do j=1, nz
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k = icol(j)
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if ((1<=k).and.(k<=nr).and.(k /= i)) then
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tcl = abs(val(j)) / sqrt(abs(diag(i)*diag(k)))
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if (abs(val(j)) > theta*sqrt(abs(diag(i)*diag(k)))) then
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!!$ if (tcl > theta) then
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n = ilaggr(k)
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if (n>0) then
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if (n>naggr) then
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info=psb_err_internal_error_
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call psb_errpush(info,name,a_err='loc_Aggregate: n > naggr 2 ?')
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goto 9999
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end if
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if ((abs(val(j))>cpling) .or. &
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& ((abs(val(j)) == cpling).and. (ils(n) < isz))) then
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!!$ if ((tcl > cpling) .or. ((tcl == cpling).and. (ils(n) < isz))) then
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ia = n
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isz = ils(n)
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cpling = abs(val(j))
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!!$ cpling = tcl
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endif
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endif
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endif
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end if
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enddo
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if (ia == -1) then
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! At this point, the easiest thing is to start a new aggregate
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naggr = naggr + 1
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ilaggr(i) = naggr
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ils(ilaggr(i)) = 1
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else
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ilaggr(i) = ia
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if (ia>naggr) then
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info=psb_err_internal_error_
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call psb_errpush(info,name,a_err='loc_Aggregate: n > naggr ? ')
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goto 9999
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end if
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ils(ia) = ils(ia) + 1
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endif
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end if
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end do
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if (debug_level >= psb_debug_outer_) then
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if (recovery) then
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write(debug_unit,*) me,' ',trim(name),&
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& 'Had to recover from strange situation in loc_aggregate.'
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write(debug_unit,*) me,' ',trim(name),&
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& 'Perhaps an unsymmetric pattern?'
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endif
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write(debug_unit,*) me,' ',trim(name),&
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& 'Phase 2: number of aggregates ',naggr,sum(ils)
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do i=1, naggr
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write(debug_unit,*) me,' ',trim(name),&
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& 'Size of aggregate ',i,' :',count(ilaggr == i), ils(i)
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enddo
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write(debug_unit,*) me,' ',trim(name),&
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& maxval(ils(1:naggr))
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write(debug_unit,*) me,' ',trim(name),&
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& 'Leftovers ',count(ilaggr<0), ' in ',nlp,' loops'
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end if
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if (count(ilaggr<0) >0) then
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info=psb_err_internal_error_
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call psb_errpush(info,name,a_err='Fatal error: some leftovers')
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goto 9999
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endif
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deallocate(ils,neigh,stat=info)
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if (info /= psb_success_) 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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if (naggr > ncol) then
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write(0,*) name,'Error : naggr > ncol',naggr,ncol
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info=psb_err_internal_error_
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call psb_errpush(info,name,a_err='Fatal error: naggr>ncol')
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goto 9999
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end if
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call psb_realloc(ncol,ilaggr,info)
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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_realloc'
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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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allocate(nlaggr(np),stat=info)
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if (info /= psb_success_) then
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info=psb_err_alloc_request_
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call psb_errpush(info,name,i_err=(/np,0,0,0,0/),&
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& a_err='integer')
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goto 9999
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end if
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nlaggr(:) = 0
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nlaggr(me+1) = naggr
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call psb_sum(ictxt,nlaggr(1:np))
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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.eq.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_z_dec_map_bld
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