amg4psblas/mlprec/mld_saggrmat_smth_asb.F90

!!$ 
!!$ 
!!$                           MLD2P4  version 1.0
!!$  MultiLevel Domain Decomposition Parallel Preconditioners Package
!!$             based on PSBLAS (Parallel Sparse BLAS version 2.2)
!!$  
!!$  (C) Copyright 2008
!!$
!!$                      Salvatore Filippone  University of Rome Tor Vergata       
!!$                      Alfredo Buttari      University of Rome Tor Vergata
!!$                      Pasqua D'Ambra       ICAR-CNR, Naples
!!$                      Daniela di Serafino  Second University of Naples
!!$ 
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!!$
! File: mld_saggrmat_smth_asb.F90
!
! Subroutine: mld_saggrmat_smth_asb
! Version:    real
!
!  This routine builds a coarse-level matrix A_C from a fine-level matrix A
!  by using a Galerkin approach, i.e.
!
!                               A_C = P_C^T A P_C,
!
!  where P_C is a prolongator from the coarse level to the fine one.
! 
!  The prolongator P_C is built according to a smoothed aggregation algorithm,
!  i.e. it is obtained by applying a damped Jacobi smoother to the piecewise
!  constant interpolation operator P corresponding to the fine-to-coarse level 
!  mapping built by the mld_aggrmap_bld subroutine:
!
!                            P_C = (I - omega*D^(-1)A) * P,
!
!  where D is the diagonal matrix with main diagonal equal to the main diagonal
!  of A, and omega is a suitable smoothing parameter. An estimate of the spectral
!  radius of D^(-1)A, to be used in the computation of omega, is provided, 
!  according to the value of p%iprcparm(mld_aggr_omega_alg_), specified by the user
!  through mld_sprecinit and mld_sprecset.
!
!  This routine can also build A_C according to a "bizarre" aggregation algorithm,
!  using a "naive" prolongator proposed by the authors of MLD2P4. However, this
!  prolongator still requires a deep analysis and testing and its use is not
!  recommended.
!
!  The coarse-level matrix A_C is distributed among the parallel processes or
!  replicated on each of them, according to the value of p%iprcparm(mld_coarse_mat_),
!  specified by the user through mld_sprecinit and mld_sprecset.
!
!  For more details see
!    M. Brezina and P. Vanek, A black-box iterative solver based on a 
!    two-level Schwarz method, Computing,  63 (1999), 233-263.
!    P. D'Ambra, D. di Serafino and S. Filippone, On the development of
!    PSBLAS-based parallel two-level Schwarz preconditioners, Appl. Num. Math.
!    57 (2007), 1181-1196.
!
! Arguments:
!    a          -  type(psb_sspmat_type), input.     
!                  The sparse matrix structure containing the local part of
!                  the fine-level matrix.
!    desc_a     -  type(psb_desc_type), input.
!                  The communication descriptor of the fine-level matrix.
!    p          -  type(mld_s_onelev_type), input/output.
!                  The one-level preconditioner data structure containing the local
!                  part of the base preconditioner to be built as well as the
!                  aggregate matrices.
!    info       -  integer, output.
!                  Error code.
!
subroutine mld_saggrmat_smth_asb(a,desc_a,ilaggr,nlaggr,p,info)
  use psb_base_mod
  use mld_inner_mod, mld_protect_name => mld_saggrmat_smth_asb

#ifdef MPI_MOD
  use mpi
#endif
  implicit none
#ifdef MPI_H
  include 'mpif.h'
#endif

  ! Arguments
  type(psb_sspmat_type), intent(in)              :: a
  type(psb_desc_type), intent(in)                :: desc_a
  integer, intent(inout)                          :: ilaggr(:), nlaggr(:)
  type(mld_s_onelev_type), intent(inout), target :: p
  integer, intent(out)                           :: info

  ! Local variables
  type(psb_sspmat_type) :: b
  integer, allocatable  :: nzbr(:), idisp(:)
  integer :: nrow, nglob, ncol, ntaggr, nzac, ip, ndx,&
       & naggr, nzl,naggrm1,naggrp1, i, j, k
  integer ::ictxt,np,me, err_act, icomm
  character(len=20) :: name
  type(psb_sspmat_type) :: am1,am2
  type(psb_sspmat_type) :: am3,am4
  real(psb_spk_), allocatable :: adiag(:)
  logical            :: ml_global_nmb
  integer            :: debug_level, debug_unit
  integer, parameter :: ncmax=16
  real(psb_spk_)   :: omega, anorm, tmp, dg

  name='mld_aggrmat_smth_asb'
  if(psb_get_errstatus().ne.0) return 
  info=0
  call psb_erractionsave(err_act)
  debug_unit  = psb_get_debug_unit()
  debug_level = psb_get_debug_level()

  ictxt = psb_cd_get_context(desc_a)
  icomm = psb_cd_get_mpic(desc_a)
  ictxt = psb_cd_get_context(desc_a)

  call psb_info(ictxt, me, np)


  call psb_nullify_sp(b)
  call psb_nullify_sp(am3)
  call psb_nullify_sp(am4)
  call psb_nullify_sp(am1)
  call psb_nullify_sp(am2)

  nglob = psb_cd_get_global_rows(desc_a)
  nrow  = psb_cd_get_local_rows(desc_a)
  ncol  = psb_cd_get_local_cols(desc_a)

  naggr  = nlaggr(me+1)
  ntaggr = sum(nlaggr)

  allocate(nzbr(np), idisp(np),stat=info)
  if (info /= 0) then 
    info=4025
    call psb_errpush(info,name,i_err=(/2*np,0,0,0,0/),&
         & a_err='integer')
    goto 9999      
  end if

  naggrm1 = sum(nlaggr(1:me))
  naggrp1 = sum(nlaggr(1:me+1))
  ml_global_nmb = ( (p%iprcparm(mld_aggr_kind_) == mld_smooth_prol_).or.&
       & ( (p%iprcparm(mld_aggr_kind_) == mld_biz_prol_).and.&
       &    (p%iprcparm(mld_coarse_mat_) == mld_repl_mat_)) ) 

  if (ml_global_nmb) then 
    ilaggr(1:nrow) = ilaggr(1:nrow) + naggrm1
    call psb_halo(ilaggr,desc_a,info)

    if (info /= 0) then
      call psb_errpush(4010,name,a_err='psb_halo')
      goto 9999
    end if
  end if

  ! naggr: number of local aggregates
  ! nrow: local rows. 
  ! 
  allocate(adiag(nrow),stat=info)

  if (info /= 0) then 
    info=4025
    call psb_errpush(info,name,i_err=(/nrow,0,0,0,0/),&
         & a_err='real(psb_spk_)')
    goto 9999      
  end if

  ! Get diagonal D
  call psb_sp_getdiag(a,adiag,info)
  if(info /= 0) then
    call psb_errpush(4010,name,a_err='sp_getdiag')
    goto 9999
  end if

  do i=1,size(adiag)
    if (adiag(i) /= szero) then
      adiag(i) = sone / adiag(i)
    else
      adiag(i) = sone
    end if
  end do

  ! 1. Allocate Ptilde in sparse matrix form 
  am4%fida='COO'
  am4%m=ncol
  if (ml_global_nmb) then 
    am4%k=ntaggr
    call psb_sp_all(ncol,ntaggr,am4,ncol,info)
  else 
    am4%k=naggr
    call psb_sp_all(ncol,naggr,am4,ncol,info)
  endif

  if (info /= 0) then
    call psb_errpush(4010,name,a_err='spall')
    goto 9999
  end if

  if (ml_global_nmb) then 
    do i=1,ncol
      am4%aspk(i) = sone
      am4%ia1(i)  = i
      am4%ia2(i)  = ilaggr(i)  
    end do
    am4%infoa(psb_nnz_) = ncol
  else
    do i=1,nrow
      am4%aspk(i) = sone
      am4%ia1(i)  = i
      am4%ia2(i)  = ilaggr(i)  
    end do
    am4%infoa(psb_nnz_) = nrow
  endif


  call psb_spcnv(am4,info,afmt='csr',dupl=psb_dupl_add_)
  if (info==0) call psb_spcnv(a,am3,info,afmt='csr',dupl=psb_dupl_add_)
  if (info /= 0) then
    call psb_errpush(4010,name,a_err='spcnv')
    goto 9999
  end if
  if (debug_level >= psb_debug_outer_) &
       & write(debug_unit,*) me,' ',trim(name),&
       & ' Initial copies done.'

  !
  ! WARNING: the cycles below assume that AM3 does have 
  ! its diagonal elements stored explicitly!!! 
  ! Should we switch to something safer? 
  !
  call psb_sp_scal(am3,adiag,info)
  if (info /= 0) goto 9999

  if (p%iprcparm(mld_aggr_omega_alg_) == mld_eig_est_) then 

    if (p%iprcparm(mld_aggr_eig_) == mld_max_norm_) then 

      if (p%iprcparm(mld_aggr_kind_) == mld_biz_prol_) then 

        ! 
        ! This only works with CSR.
        !
        if (psb_toupper(am3%fida)=='CSR') then 
          anorm = szero
          dg    = sone
          do i=1,am3%m
            tmp = szero
            do j=am3%ia2(i),am3%ia2(i+1)-1
              if (am3%ia1(j) <= am3%m) then 
                tmp = tmp + abs(am3%aspk(j))
              endif
              if (am3%ia1(j) == i ) then 
                dg = abs(am3%aspk(j))
              end if
            end do
            anorm = max(anorm,tmp/dg) 
          enddo

          call psb_amx(ictxt,anorm)     
        else
          info = 4001
          call psb_errpush(info,name,a_err='this section only CSR')
          goto 9999
        endif
      else
        anorm = psb_spnrmi(am3,desc_a,info)
      endif
      if (info /= 0) then 
        call psb_errpush(4001,name,a_err='Invalid AM3 storage format')
        goto 9999
      end if
      omega = 4.d0/(3.d0*anorm)
      p%rprcparm(mld_aggr_omega_val_) = omega 

    else 
      info = 4001
      call psb_errpush(info,name,a_err='invalid mld_aggr_eig_')
      goto 9999
    end if

  else if (p%iprcparm(mld_aggr_omega_alg_) == mld_user_choice_) then 

    omega = p%rprcparm(mld_aggr_omega_val_) 

  else if (p%iprcparm(mld_aggr_omega_alg_) /= mld_user_choice_) then 
    info = 4001
    call psb_errpush(info,name,a_err='invalid mld_aggr_omega_alg_')
    goto 9999
  end if


  if (psb_toupper(am3%fida)=='CSR') then 
    do i=1,am3%m
      do j=am3%ia2(i),am3%ia2(i+1)-1
        if (am3%ia1(j) == i) then 
          am3%aspk(j) = sone - omega*am3%aspk(j) 
        else
          am3%aspk(j) = - omega*am3%aspk(j) 
        end if
      end do
    end do
  else 
    call psb_errpush(4001,name,a_err='Invalid AM3 storage format')
    goto 9999
  end if

  if (debug_level >= psb_debug_outer_) &
       & write(debug_unit,*) me,' ',trim(name),&
       & 'Done gather, going for SYMBMM 1'
  !
  ! Symbmm90 does the allocation for its result.
  ! 
  ! am1 = (i-wDA)Ptilde
  ! Doing it this way means to consider diag(Ai)
  ! 
  !
  call psb_symbmm(am3,am4,am1,info)
  if(info /= 0) then
    call psb_errpush(4010,name,a_err='symbmm 1')
    goto 9999
  end if

  call psb_numbmm(am3,am4,am1)

  if (debug_level >= psb_debug_outer_) &
       & write(debug_unit,*) me,' ',trim(name),&
       & 'Done NUMBMM 1'

  call psb_sp_free(am4,info)
  if(info /= 0) then
    call psb_errpush(4010,name,a_err='sp_free')
    goto 9999
  end if

  if (ml_global_nmb) then 
    !
    ! Now we have to gather the halo of am1, and add it to itself
    ! to multiply it by A,
    !
    call psb_sphalo(am1,desc_a,am4,info,&
         & colcnv=.false.,rowscale=.true.)
    if (info == 0) call psb_rwextd(ncol,am1,info,b=am4)      
    if (info == 0) call psb_sp_free(am4,info)
  else 
    call psb_rwextd(ncol,am1,info)
  endif
  if(info /= 0) then
    call psb_errpush(4001,name,a_err='Halo of am1')
    goto 9999
  end if

  call psb_symbmm(a,am1,am3,info)
  if(info /= 0) then
    call psb_errpush(4010,name,a_err='symbmm 2')
    goto 9999
  end if

  call psb_numbmm(a,am1,am3)
  if (debug_level >= psb_debug_outer_) &
       & write(debug_unit,*) me,' ',trim(name),&
       & 'Done NUMBMM 2'

  if  (p%iprcparm(mld_aggr_kind_) == mld_smooth_prol_) then 
    call psb_transp(am1,am2,fmt='COO')
    nzl = am2%infoa(psb_nnz_)
    i=0
    !
    ! Now we have to fix this.  The only rows of B that are correct 
    ! are those corresponding to "local" aggregates, i.e. indices in ilaggr(:)
    !
    do k=1, nzl
      if ((naggrm1 < am2%ia1(k)) .and.(am2%ia1(k) <= naggrp1)) then
        i = i+1
        am2%aspk(i) = am2%aspk(k)
        am2%ia1(i)  = am2%ia1(k)
        am2%ia2(i)  = am2%ia2(k)
      end if
    end do
    am2%infoa(psb_nnz_) = i
    call psb_spcnv(am2,info,afmt='csr',dupl=psb_dupl_add_)
    if (info /=0) then 
      call psb_errpush(4010,name,a_err='spcnv am2')
      goto 9999
    end if
  else
    call psb_transp(am1,am2)
  endif
  if (debug_level >= psb_debug_outer_) &
       & write(debug_unit,*) me,' ',trim(name),&
       & 'starting sphalo/ rwxtd'

  if (p%iprcparm(mld_aggr_kind_) == mld_smooth_prol_) then 
    ! am2 = ((i-wDA)Ptilde)^T
    call psb_sphalo(am3,desc_a,am4,info,&
         & colcnv=.false.,rowscale=.true.)
    if (info == 0) call psb_rwextd(ncol,am3,info,b=am4)      
    if (info == 0) call psb_sp_free(am4,info)
  else if  (p%iprcparm(mld_aggr_kind_) == mld_biz_prol_) then 
    call psb_rwextd(ncol,am3,info)
  endif
  if(info /= 0) then
    call psb_errpush(4001,name,a_err='Extend am3')
    goto 9999
  end if


  if (debug_level >= psb_debug_outer_) &
       & write(debug_unit,*) me,' ',trim(name),&
       & 'starting symbmm 3'
  call psb_symbmm(am2,am3,b,info)
  if (info == 0) call psb_numbmm(am2,am3,b)
  if (info == 0) call psb_sp_free(am3,info)
  if (info == 0) call psb_spcnv(b,info,afmt='coo',dupl=psb_dupl_add_)
  if (info /= 0) then
    call psb_errpush(4001,name,a_err='Build b = am2 x am3')
    goto 9999
  end if



  select case(p%iprcparm(mld_aggr_kind_))

  case(mld_smooth_prol_) 

    select case(p%iprcparm(mld_coarse_mat_))

    case(mld_distr_mat_) 

      call psb_sp_clone(b,p%ac,info)
      nzac = p%ac%infoa(psb_nnz_) 
      nzl =  p%ac%infoa(psb_nnz_) 
      if (info == 0) call psb_cdall(ictxt,p%desc_ac,info,nl=nlaggr(me+1))
      if (info == 0) call psb_cdins(nzl,p%ac%ia1,p%ac%ia2,p%desc_ac,info)
      if (info == 0) call psb_cdasb(p%desc_ac,info)
      if (info == 0) call psb_glob_to_loc(p%ac%ia1(1:nzl),p%desc_ac,info,iact='I')
      if (info == 0) call psb_glob_to_loc(p%ac%ia2(1:nzl),p%desc_ac,info,iact='I')
      if (info /= 0) then
        call psb_errpush(4001,name,a_err='Creating p%desc_ac and converting ac')
        goto 9999
      end if
      if (debug_level >= psb_debug_outer_) &
           & write(debug_unit,*) me,' ',trim(name),&
           & 'Assembld aux descr. distr.'


      p%ac%m=psb_cd_get_local_rows(p%desc_ac)
      p%ac%k=psb_cd_get_local_cols(p%desc_ac)
      p%ac%fida='COO'
      p%ac%descra='GUN'

      call psb_sp_free(b,info)
      if (info == 0) deallocate(nzbr,idisp,stat=info)
      if (info /= 0) then
        call psb_errpush(4010,name,a_err='psb_sp_free')
        goto 9999
      end if

      if (np>1) then 
        nzl = psb_sp_get_nnzeros(am1)
        call psb_glob_to_loc(am1%ia1(1:nzl),p%desc_ac,info,'I')
        if(info /= 0) then
          call psb_errpush(4010,name,a_err='psb_glob_to_loc')
          goto 9999
        end if
      endif
      am1%k=psb_cd_get_local_cols(p%desc_ac)

      if (np>1) then 
        call psb_spcnv(am2,info,afmt='coo',dupl=psb_dupl_add_)
        nzl = am2%infoa(psb_nnz_) 
        if (info == 0) call psb_glob_to_loc(am2%ia1(1:nzl),p%desc_ac,info,'I')
        if (info == 0) call psb_spcnv(am2,info,afmt='csr',dupl=psb_dupl_add_)        
        if(info /= 0) then
          call psb_errpush(4001,name,a_err='Converting am2 to local')
          goto 9999
        end if
      end if
      am2%m=psb_cd_get_local_cols(p%desc_ac)

      if (debug_level >= psb_debug_outer_) &
           & write(debug_unit,*) me,' ',trim(name),&
           & 'Done ac '

    case(mld_repl_mat_) 
      !
      !
      call psb_cdall(ictxt,p%desc_ac,info,mg=ntaggr,repl=.true.)
      nzbr(:) = 0
      nzbr(me+1) = b%infoa(psb_nnz_)

      call psb_sum(ictxt,nzbr(1:np))
      nzac = sum(nzbr)
      if (info == 0) call psb_sp_all(ntaggr,ntaggr,p%ac,nzac,info)
      if (info /= 0) goto 9999

      do ip=1,np
        idisp(ip) = sum(nzbr(1:ip-1))
      enddo
      ndx = nzbr(me+1) 

      call mpi_allgatherv(b%aspk,ndx,mpi_real,p%ac%aspk,nzbr,idisp,&
           & mpi_real,icomm,info)
      if (info == 0) call mpi_allgatherv(b%ia1,ndx,mpi_integer,p%ac%ia1,nzbr,idisp,&
           & mpi_integer,icomm,info)
      if (info == 0) call mpi_allgatherv(b%ia2,ndx,mpi_integer,p%ac%ia2,nzbr,idisp,&
           & mpi_integer,icomm,info)

      if (info /= 0) then 
        call psb_errpush(4001,name,a_err=' from mpi_allgatherv')
        goto 9999
      end if

      p%ac%m = ntaggr
      p%ac%k = ntaggr
      p%ac%infoa(psb_nnz_) = nzac
      p%ac%fida='COO'
      p%ac%descra='GUN'
      call psb_spcnv(p%ac,info,afmt='coo',dupl=psb_dupl_add_)
      if(info /= 0) goto 9999
      call psb_sp_free(b,info)
      if(info /= 0) goto 9999

      deallocate(nzbr,idisp,stat=info)
      if (info /= 0) then 
        info = 4000
        call psb_errpush(info,name)
        goto 9999
      end if
    case default 
      info = 4001
      call psb_errpush(info,name,a_err='invalid mld_coarse_mat_')
      goto 9999
    end select


  case(mld_biz_prol_) 

    select case(p%iprcparm(mld_coarse_mat_))

    case(mld_distr_mat_) 

      call psb_sp_clone(b,p%ac,info)
      if (info == 0) call psb_cdall(ictxt,p%desc_ac,info,nl=naggr)
      if (info == 0) call psb_cdasb(p%desc_ac,info)
      if (info == 0) call psb_sp_free(b,info)
      if (info /=  0) then
        call psb_errpush(4010,name,a_err='Build desc_ac, ac')
        goto 9999
      end if


    case(mld_repl_mat_) 
      !
      !
      call psb_cdall(ictxt,p%desc_ac,info,mg=ntaggr,repl=.true.)
      if(info /= 0) then
        call psb_errpush(4010,name,a_err='psb_cdall')
        goto 9999
      end if

      nzbr(:) = 0
      nzbr(me+1) = b%infoa(psb_nnz_)
      call psb_sum(ictxt,nzbr(1:np))
      nzac = sum(nzbr)
      call psb_sp_all(ntaggr,ntaggr,p%ac,nzac,info)
      if(info /= 0) then
        call psb_errpush(4010,name,a_err='psb_sp_all')
        goto 9999
      end if

      do ip=1,np
        idisp(ip) = sum(nzbr(1:ip-1))
      enddo
      ndx = nzbr(me+1) 

      call mpi_allgatherv(b%aspk,ndx,mpi_real,p%ac%aspk,nzbr,idisp,&
           & mpi_real,icomm,info)
      if (info == 0) call mpi_allgatherv(b%ia1,ndx,mpi_integer,p%ac%ia1,nzbr,idisp,&
           & mpi_integer,icomm,info)
      if (info == 0) call mpi_allgatherv(b%ia2,ndx,mpi_integer,p%ac%ia2,nzbr,idisp,&
           & mpi_integer,icomm,info)
      if (info /= 0) then 
        call psb_errpush(4001,name,a_err=' from mpi_allgatherv')
        goto 9999
      end if


      p%ac%m = ntaggr
      p%ac%k = ntaggr
      p%ac%infoa(psb_nnz_) = nzac
      p%ac%fida='COO'
      p%ac%descra='GUN'
      call psb_spcnv(p%ac,info,afmt='coo',dupl=psb_dupl_add_)
      if(info /= 0) then
        call psb_errpush(4010,name,a_err='spcnv')
        goto 9999
      end if
      call psb_sp_free(b,info)
      if(info /= 0) then
        call psb_errpush(4010,name,a_err='psb_sp_free')
        goto 9999
      end if

    case default 
      info = 4001
      call psb_errpush(info,name,a_err='invalid mld_coarse_mat_')
      goto 9999
    end select

    deallocate(nzbr,idisp,stat=info)
    if (info /= 0) then 
      info = 4000
      call psb_errpush(info,name)
      goto 9999
    end if

  case default 
    info = 4001
    call psb_errpush(info,name,a_err='invalid mld_smooth_prol_')
    goto 9999

  end select

  call psb_spcnv(p%ac,info,afmt='csr',dupl=psb_dupl_add_)
  if(info /= 0) then
    call psb_errpush(4010,name,a_err='spcnv')
    goto 9999
  end if

  !
  ! Copy the prolongation/restriction matrices into the descriptor map.
  !  am2 => PR^T   i.e. restriction  operator
  !  am1 => PR     i.e. prolongation operator
  !  
  p%map = psb_linmap(psb_map_aggr_,desc_a,&
       & p%desc_ac,am2,am1,ilaggr,nlaggr)
  if (info == 0) call psb_sp_free(am1,info)
  if (info == 0) call psb_sp_free(am2,info)
  if(info /= 0) then
    call psb_errpush(4010,name,a_err='sp_Free')
    goto 9999
  end if


  if (debug_level >= psb_debug_outer_) &
       & write(debug_unit,*) me,' ',trim(name),&
       & 'Done smooth_aggregate '
  call psb_erractionrestore(err_act)
  return

9999 continue
  call psb_errpush(info,name)
  call psb_erractionrestore(err_act)
  if (err_act.eq.psb_act_abort_) then
    call psb_error()
    return
  end if
  return



end subroutine mld_saggrmat_smth_asb