psblas3/base/internals/psi_symm_dep_list.F90

!   
!                Parallel Sparse BLAS  version 3.5
!      (C) Copyright 2006-2018
!        Salvatore Filippone    
!        Alfredo Buttari      
!   
!    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 PSBLAS 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
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!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
!    POSSIBILITY OF SUCH DAMAGE.
!   
!   
!
! File: psi_fnd_owner.f90
!
! Subroutine: psi_fnd_owner
!   Figure out who owns  global indices. 
! 
! Arguments: 
! 
subroutine psi_symm_dep_list_inrv(rvsz,adj,ictxt,info)
  use psb_serial_mod
  use psb_const_mod
  use psb_error_mod
  use psb_penv_mod
  use psb_realloc_mod
  use psb_indx_map_mod, psb_protect_name => psi_symm_dep_list_inrv
#ifdef MPI_MOD
  use mpi
#endif

  implicit none 
#ifdef MPI_H
  include 'mpif.h'
#endif
  integer(psb_mpk_), intent(inout)   :: rvsz(0:)
  integer(psb_ipk_), allocatable, intent(inout) :: adj(:)
  integer(psb_ipk_), intent(in)      :: ictxt
  integer(psb_ipk_), intent(out)     :: info
  
  !
  integer(psb_ipk_), allocatable :: ladj(:) 
  integer(psb_mpk_) :: icomm, minfo
  integer(psb_ipk_) :: i,n_row,n_col,err_act,hsize,ip,&
       & last_ih, last_j, nidx, nrecv, nadj, flag_
  integer(psb_lpk_) :: mglob, ih
  integer(psb_ipk_) :: np,me
  character(len=20)   :: name

  info = psb_success_
  name = 'psi_symm_dep_list'
  call psb_erractionsave(err_act)

  icomm = psb_get_mpi_comm(ictxt)

  call psb_info(ictxt, me, np)

  if (np == -1) then
    info = psb_err_context_error_
    call psb_errpush(info,name)
    goto 9999
  endif

  nadj = size(adj)

  !
  ! Am getting this from the outside, possibly from the wrapper call
  !
  if (size(rvsz)<np) then 
    call psb_errpush(psb_err_from_subroutine_,name,a_err='invalid rvsz')
    goto 9999      
  end if
  nrecv = 0 
  do ip=0, np-1
    if (rvsz(ip) > 0) nrecv = nrecv + 1
  end do

  !
  !  Now fix adj to be symmetric
  !
  call psb_realloc(nadj+nrecv,ladj,info)
  ladj(1:nadj) = adj(1:nadj)
  do ip=0, np-1
    if (rvsz(ip)>0) then
      nadj  = nadj + 1 
      ladj(nadj) = ip
    end if
  end do
  call psb_msort_unique(ladj,nadj)
  call psb_realloc(nadj,adj,info)
  if (info == 0) adj(1:nadj) = ladj(1:nadj) 
  
  call psb_erractionrestore(err_act)
  return

9999 call psb_error_handler(ictxt,err_act)

  return

end subroutine psi_symm_dep_list_inrv

subroutine psi_symm_dep_list_norv(adj,ictxt,info)
  use psb_serial_mod
  use psb_const_mod
  use psb_error_mod
  use psb_penv_mod
  use psb_realloc_mod
  use psb_indx_map_mod, psb_protect_name => psi_symm_dep_list_norv
#ifdef MPI_MOD
  use mpi
#endif

  implicit none 
#ifdef MPI_H
  include 'mpif.h'
#endif
  integer(psb_ipk_), allocatable, intent(inout) :: adj(:)
  integer(psb_ipk_), intent(in)      :: ictxt
  integer(psb_ipk_), intent(out)     :: info
  
  !
  integer(psb_mpk_), allocatable :: rvsz(:), sdsz(:) 

  integer(psb_mpk_) :: icomm, minfo
  integer(psb_ipk_) :: i,n_row,n_col,err_act,hsize,ip,&
       & last_ih, last_j, nidx, nrecv, nadj
  integer(psb_ipk_) :: mglob, ih
  integer(psb_ipk_) :: np,me
  character(len=20) :: name

  info = psb_success_
  name = 'psi_symm_dep_list'
  call psb_erractionsave(err_act)

  icomm = psb_get_mpi_comm(ictxt)

  call psb_info(ictxt, me, np)

  if (np == -1) then
    info = psb_err_context_error_
    call psb_errpush(info,name)
    goto 9999
  endif

  nadj = size(adj)
  
  ! write(0,*) me,name,' Going through ',nidx,nadj
  
  Allocate(sdsz(0:np-1), rvsz(0:np-1), stat=info)
  !
  ! First, send sizes according to adjcncy list
  !
  sdsz = 0 
  do i=1, nadj
    sdsz(adj(i)) = 1
  end do
  !write(0,*)me,' Check on sizes into a2a:',adj(:),nadj,':',sdsz(:)
  
  call mpi_alltoall(sdsz,1,psb_mpi_mpk_,&
       & rvsz,1,psb_mpi_mpk_,icomm,minfo)
  if (minfo == 0)  call psi_symm_dep_list(rvsz,adj,ictxt,info)
  if ((minfo /=0).or.(info /= 0)) then
    call psb_errpush(psb_err_from_subroutine_,name,a_err='inner call symm_dep')
    goto 9999      
  end if

  call psb_erractionrestore(err_act)
  return

9999 call psb_error_handler(ictxt,err_act)

  return

end subroutine psi_symm_dep_list_norv