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psblas3/prec/impl/psb_s_ainv_bld.f90

226 lines
7.8 KiB
Fortran

!
! 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
! 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.
!
! Moved here from AMG-AINV, original copyright below.
!
!
! AMG-AINV: Approximate Inverse plugin for
! AMG4PSBLAS version 1.0
!
! (C) Copyright 2020
!
! Salvatore Filippone 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 AMG4PSBLAS 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 AMG4PSBLAS 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 psb_s_ainv_bld(a,alg,fillin,thresh,wmat,d,zmat,desc,info,blck,iscale)
use psb_base_mod
use psb_prec_const_mod
use psb_s_biconjg_mod
implicit none
! Arguments
type(psb_sspmat_type), intent(in), target :: a
integer(psb_ipk_), intent(in) :: fillin,alg
real(psb_spk_), intent(in) :: thresh
type(psb_sspmat_type), intent(inout) :: wmat, zmat
real(psb_spk_), allocatable :: d(:)
Type(psb_desc_type), Intent(in) :: desc
integer(psb_ipk_), intent(out) :: info
type(psb_sspmat_type), intent(in), optional :: blck
integer(psb_ipk_), intent(in), optional :: iscale
!
integer(psb_ipk_) :: i, nztota, err_act, n_row, nrow_a
type(psb_s_coo_sparse_mat) :: acoo
type(psb_s_csr_sparse_mat) :: acsr
type(psb_sspmat_type) :: atmp
real(psb_spk_), allocatable :: arws(:), acls(:)
real(psb_spk_), allocatable :: pq(:), ad(:)
integer(psb_ipk_) :: debug_level, debug_unit
type(psb_ctxt_type) :: ctxt
integer(psb_ipk_) :: np,me
integer(psb_ipk_) :: nzrmax, iscale_
real(psb_spk_) :: sp_thresh
real(psb_spk_) :: weight
character(len=20) :: name, ch_err
info = psb_success_
name = 'psb_sainv_bld'
call psb_erractionsave(err_act)
if (psb_errstatus_fatal()) then
info = psb_err_internal_error_; goto 9999
end if
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
ctxt = psb_cd_get_context(desc)
call psb_info(ctxt, me, np)
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),' start'
iscale_ = psb_ilu_scale_none_
if (present(iscale)) iscale_ = iscale
weight = sone
!
! Check the memory available to hold the W and Z factors
! and allocate it if needed
!
nrow_a = a%get_nrows()
nztota = a%get_nzeros()
if (present(blck)) then
nztota = nztota + blck%get_nzeros()
end if
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),&
& ': out get_nnzeros',nrow_a,nztota,&
& a%get_nrows(),a%get_ncols(),a%get_nzeros()
n_row = desc%get_local_rows()
allocate(pq(n_row),stat=info)
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate')
goto 9999
end if
nzrmax = fillin
sp_thresh = thresh
!
! Ok, let's start first with Z (i.e. Upper)
!
call a%csclip(acoo,info,imax=n_row,jmax=n_row)
call acsr%mv_from_coo(acoo,info)
select case(iscale_)
case(psb_ilu_scale_none_)
! Ok, do nothing.
case(psb_ilu_scale_maxval_)
weight = acsr%maxval()
weight = sone/weight
call acsr%scal(weight,info)
case(psb_ilu_scale_arcsum_)
allocate(arws(n_row),acls(n_row),ad(n_row),stat=info)
if (info /= psb_success_) then
call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate')
goto 9999
end if
call acsr%arwsum(arws)
call acsr%aclsum(acls)
ad(1:n_row) = sqrt(sqrt(arws(1:n_row)*acls(1:n_row)))
ad(1:n_row) = sone/ad(1:n_row)
call acsr%scal(ad,info,side='L')
call acsr%scal(ad,info,side='R')
case default
call psb_errpush(psb_err_from_subroutine_,name,a_err='wrong iscale')
goto 9999
end select
!
! Here for the actual workhorses.
! Only biconjg is surviving for now....
!
call psb_sparse_biconjg(alg,n_row,acsr,pq,&
& zmat,wmat,nzrmax,sp_thresh,info)
! Done. Hopefully....
if (info /= psb_success_) then
info = psb_err_internal_error_
call psb_errpush(info,name,a_err='sparse_biconjg')
goto 9999
end if
call atmp%mv_from(acsr)
!
! Is this right???
!
do i=1, n_row
if (abs(pq(i)) < d_epstol) then
pq(i) = sone
else
pq(i) = sone/pq(i)
end if
end do
select case(iscale_)
case(psb_ilu_scale_none_)
! Ok, do nothing.
case(psb_ilu_scale_maxval_)
pq(:) = pq(:)*weight
case(psb_ilu_scale_arcsum_)
call zmat%scal(ad,info,side='L')
call wmat%scal(ad,info,side='R')
case default
call psb_errpush(psb_err_from_subroutine_,name,a_err='wrong iscale')
goto 9999
end select
call psb_move_alloc(pq,d,info)
if (debug_level >= psb_debug_outer_) &
& write(debug_unit,*) me,' ',trim(name),' end'
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(err_act)
return
end subroutine psb_s_ainv_bld