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psblas3/base/internals/psi_ldsc_pre_halo.f90

177 lines
5.2 KiB
Fortran

!!$
!!$ Parallel Sparse BLAS v2.0
!!$ (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
!!$ Alfredo Buttari University of Rome Tor Vergata
!!$
!!$ 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
!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
!!$ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
!!$ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
!!$ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
!!$ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
!!$ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
!!$ POSSIBILITY OF SUCH DAMAGE.
!!$
!!$
subroutine psi_ldsc_pre_halo(desc,ext_hv,info)
use psb_descriptor_type
use psb_serial_mod
use psb_const_mod
use psb_error_mod
use psb_penv_mod
use psb_realloc_mod
use psi_mod, only : psi_fnd_owner
implicit none
type(psb_desc_type), intent(inout) :: desc
logical, intent(in) :: ext_hv
integer, intent(out) :: info
integer,allocatable :: helem(:),hproc(:)
integer,allocatable :: tmphl(:)
integer :: i,j,err,np,me,lhalo,nhalo,&
& n_col, err_act, key, ih, nh, idx, nk,icomm,hsize
integer :: ictxt,n_row
logical, parameter :: debug=.false., debugwrt=.false.
character(len=20) :: name,ch_err
info = 0
name = 'psi_ldsc_pre_halo'
call psb_erractionsave(err_act)
ictxt = psb_cd_get_context(desc)
n_row = psb_cd_get_local_rows(desc)
n_col = psb_cd_get_local_cols(desc)
call psb_get_mpicomm(ictxt,icomm )
! check on blacs grid
call psb_info(ictxt, me, np)
if (np == -1) then
info = 2010
call psb_errpush(info,name)
goto 9999
endif
if (.not.(psb_is_bld_desc(desc).and.psb_is_large_desc(desc))) then
info = 1122
call psb_errpush(info,name)
goto 9999
end if
nk = n_col
call psb_realloc(nk,2,desc%glb_lc,info)
if (info ==0) call psb_realloc(psb_hash_size,desc%hashv,info,lb=0)
if (info /= 0) then
ch_err='psb_realloc'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
desc%hashv(0:psb_hash_size) = 0
do i=1, nk
key = desc%loc_to_glob(i)
ih = iand(key,psb_hash_mask)
desc%hashv(ih) = desc%hashv(ih) + 1
end do
nh = desc%hashv(0)
idx = 1
do i=1, psb_hash_size
desc%hashv(i-1) = idx
idx = idx + nh
nh = desc%hashv(i)
end do
do i=1, nk
key = desc%loc_to_glob(i)
ih = iand(key,psb_hash_mask)
idx = desc%hashv(ih)
desc%glb_lc(idx,1) = key
desc%glb_lc(idx,2) = i
desc%hashv(ih) = desc%hashv(ih) + 1
end do
do i = psb_hash_size, 1, -1
desc%hashv(i) = desc%hashv(i-1)
end do
desc%hashv(0) = 1
do i=0, psb_hash_size-1
idx = desc%hashv(i)
nh = desc%hashv(i+1) - desc%hashv(i)
if (nh > 1) then
call imsrx(nh,desc%glb_lc(idx,1),desc%glb_lc(idx,2),1)
end if
end do
if (.not.ext_hv) then
nh = (n_col-n_row)
if (nh > 0) then
Allocate(helem(nh),stat=info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='Allocate')
goto 9999
end if
do i=1, nh
helem(i) = desc%loc_to_glob(n_row+i)
end do
call psi_fnd_owner(nh,helem,hproc,desc,info)
allocate(tmphl((3*((n_col-n_row)+1)+1)),stat=info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='Allocate')
goto 9999
end if
j = 1
do i=1,nh
tmphl(j+0) = hproc(i)
if (tmphl(j+0)<0) then
write(0,*) 'Unrecoverable error: missing proc from asb'
end if
tmphl(j+1) = 1
tmphl(j+2) = n_row+i
j = j + 3
end do
tmphl(j) = -1
lhalo = j
nhalo = (lhalo-1)/3
else
allocate(tmphl(1),stat=info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='Allocate')
goto 9999
end if
tmphl=-1
endif
call psb_transfer(tmphl,desc%halo_index,info)
end if
call psb_erractionrestore(err_act)
return
9999 continue
call psb_erractionrestore(err_act)
if (err_act.eq.psb_act_ret_) then
return
else
call psb_error(ictxt)
end if
return
end subroutine psi_ldsc_pre_halo