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201 lines
6.2 KiB
Fortran
201 lines
6.2 KiB
Fortran
!!$
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!!$ Parallel Sparse BLAS v2.0
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!!$ (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari University of Rome Tor Vergata
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!!$
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!!$ Redistribution and use in source and binary forms, with or without
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!!$ modification, are permitted provided that the following conditions
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!!$ are met:
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!!$ 1. Redistributions of source code must retain the above copyright
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!!$ notice, this list of conditions and the following disclaimer.
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!!$ 2. Redistributions in binary form must reproduce the above copyright
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!!$ notice, this list of conditions, and the following disclaimer in the
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!!$ documentation and/or other materials provided with the distribution.
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!!$ 3. The name of the PSBLAS group or the names of its contributors may
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!!$ not be used to endorse or promote products derived from this
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!!$ software without specific written permission.
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!!$
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!!$ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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!!$ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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!!$ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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!!$ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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!!$ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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!!$ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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!!$ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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!!$ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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!!$ POSSIBILITY OF SUCH DAMAGE.
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!!$
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!!$
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!
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! File: psi_ldsc_pre_halo.f90
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!
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! Subroutine: psi_ldsc_pre_halo
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! Build initial versions of data exchange lists.
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! When the descriptor is for a large index space, we cannot build
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! the data exchange lists "on-the-fly", but we also want to keep using the
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! same format conversion routines we use in the small index space case,
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! hence this adapter routine.
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! Since it also convers the AVL tree data structure into the hashed list
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! of ordered lists, it may be called to do just that; perhaps we should
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! cut away that functionality and put it somewhere else...
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!
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!
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! Arguments:
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! desc - type(<psb_desc_type>). The communication descriptor.
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! ext_hv - logical Should we work on the halo_index.
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! info - integer. return code.
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!
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subroutine psi_ldsc_pre_halo(desc,ext_hv,info)
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use psb_descriptor_type
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use psb_serial_mod
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use psb_const_mod
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use psb_error_mod
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use psb_penv_mod
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use psb_realloc_mod
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use psi_mod, psb_protect_name => psi_ldsc_pre_halo
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implicit none
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type(psb_desc_type), intent(inout) :: desc
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logical, intent(in) :: ext_hv
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integer, intent(out) :: info
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integer,allocatable :: helem(:),hproc(:)
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integer,allocatable :: tmphl(:)
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integer :: i,j,err,np,me,lhalo,nhalo,&
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& n_col, err_act, key, ih, nh, idx, nk,icomm,hsize
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integer :: ictxt,n_row
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logical, parameter :: debug=.false., debugwrt=.false.
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character(len=20) :: name,ch_err
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info = 0
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name = 'psi_ldsc_pre_halo'
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call psb_erractionsave(err_act)
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ictxt = psb_cd_get_context(desc)
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icomm = psb_cd_get_mpic(desc)
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n_row = psb_cd_get_local_rows(desc)
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n_col = psb_cd_get_local_cols(desc)
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! check on blacs grid
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call psb_info(ictxt, me, np)
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if (np == -1) then
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info = 2010
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call psb_errpush(info,name)
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goto 9999
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endif
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if (.not.(psb_is_bld_desc(desc).and.psb_is_large_desc(desc))) then
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info = 1122
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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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nk = n_col
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call psb_realloc(nk,2,desc%glb_lc,info)
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if (info ==0) call psb_realloc(psb_hash_size+1,desc%hashv,info,lb=0)
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if (info /= 0) then
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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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! Build a hashed table of sorted lists to search for
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! indices.
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desc%hashv(0:psb_hash_size) = 0
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do i=1, nk
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key = desc%loc_to_glob(i)
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ih = iand(key,psb_hash_mask)
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desc%hashv(ih) = desc%hashv(ih) + 1
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end do
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nh = desc%hashv(0)
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idx = 1
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do i=1, psb_hash_size
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desc%hashv(i-1) = idx
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idx = idx + nh
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nh = desc%hashv(i)
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end do
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do i=1, nk
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key = desc%loc_to_glob(i)
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ih = iand(key,psb_hash_mask)
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idx = desc%hashv(ih)
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desc%glb_lc(idx,1) = key
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desc%glb_lc(idx,2) = i
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desc%hashv(ih) = desc%hashv(ih) + 1
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end do
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do i = psb_hash_size, 1, -1
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desc%hashv(i) = desc%hashv(i-1)
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end do
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desc%hashv(0) = 1
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do i=0, psb_hash_size-1
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idx = desc%hashv(i)
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nh = desc%hashv(i+1) - desc%hashv(i)
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if (nh > 1) then
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call psb_msort(desc%glb_lc(idx:idx+nh-1,1),&
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& ix=desc%glb_lc(idx:idx+nh-1,2),flag=psb_sort_keep_idx_)
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end if
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end do
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if (.not.ext_hv) then
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! Here we do not know yet who owns what, so we have
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! to call fnd_owner.
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nh = (n_col-n_row)
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if (nh > 0) then
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Allocate(helem(nh),stat=info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='Allocate')
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goto 9999
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end if
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do i=1, nh
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helem(i) = desc%loc_to_glob(n_row+i)
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end do
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call psi_fnd_owner(nh,helem,hproc,desc,info)
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allocate(tmphl((3*((n_col-n_row)+1)+1)),stat=info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='Allocate')
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goto 9999
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end if
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j = 1
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do i=1,nh
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tmphl(j+0) = hproc(i)
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if (tmphl(j+0)<0) then
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write(0,*) 'Unrecoverable error: missing proc from asb'
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end if
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tmphl(j+1) = 1
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tmphl(j+2) = n_row+i
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j = j + 3
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end do
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tmphl(j) = -1
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lhalo = j
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nhalo = (lhalo-1)/3
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else
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allocate(tmphl(1),stat=info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='Allocate')
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goto 9999
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end if
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tmphl=-1
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endif
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call psb_transfer(tmphl,desc%halo_index,info)
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end if
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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_ret_) then
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return
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else
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call psb_error(ictxt)
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end if
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return
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end subroutine psi_ldsc_pre_halo
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