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psblas3/prec/psb_dilu_fct.f90

403 lines
11 KiB
Fortran

!!$
!!$ Parallel Sparse BLAS version 2.2
!!$ (C) Copyright 2006/2007/2008
!!$ 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 psb_dilu_fct(a,l,u,d,info,blck)
!
! This routine copies and factors "on the fly" from A and BLCK
! into L/D/U.
!
!
use psb_base_mod
implicit none
! .. Scalar Arguments ..
integer, intent(out) :: info
! .. Array Arguments ..
type(psb_d_sparse_mat),intent(in) :: a
type(psb_d_csr_sparse_mat),intent(inout) :: l,u
type(psb_d_sparse_mat),intent(in), optional, target :: blck
real(psb_dpk_), intent(inout) :: d(:)
! .. Local Scalars ..
integer :: l1,l2,m,err_act
type(psb_d_sparse_mat), pointer :: blck_
character(len=20) :: name, ch_err
name='psb_dcsrlu'
info = 0
call psb_erractionsave(err_act)
! .. Executable Statements ..
!
if (present(blck)) then
blck_ => blck
else
allocate(blck_,stat=info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='Allocate')
goto 9999
end if
call blck_%csall(0,0,info,1)
endif
call psb_dilu_fctint(m,a%get_nrows(),a,blck_%get_nrows(),blck_,&
& d,l%val,l%ja,l%irp,u%val,u%ja,u%irp,l1,l2,info)
if(info /= 0) then
info=4010
ch_err='psb_dilu_fctint'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
call l%set_triangle()
call l%set_lower()
call l%set_unit()
call u%set_triangle()
call u%set_upper()
call u%set_unit()
call l%set_nrows(m)
call l%set_ncols(m)
call u%set_nrows(m)
call u%set_ncols(m)
if (present(blck)) then
blck_ => null()
else
call blck_%free()
if(info /= 0) then
info=4010
ch_err='psb_sp_free'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
deallocate(blck_)
endif
call psb_erractionrestore(err_act)
return
9999 continue
call psb_erractionrestore(err_act)
if (err_act == psb_act_abort_) then
call psb_error()
return
end if
return
contains
subroutine psb_dilu_fctint(m,ma,a,mb,b,&
& d,laspk,lia1,lia2,uaspk,uia1,uia2,l1,l2,info)
use psb_d_base_mat_mod
implicit none
type(psb_d_sparse_mat) :: a
type(psb_d_sparse_mat) :: b
integer :: m,ma,mb,l1,l2,info
integer, dimension(:) :: lia1,lia2,uia1,uia2
real(psb_dpk_), dimension(:) :: laspk,uaspk,d
integer :: i,j,k,l,low1,low2,kk,jj,ll, irb, ktrw,err_act, nz
real(psb_dpk_) :: dia,temp
integer, parameter :: nrb=60
type(psb_d_coo_sparse_mat) :: trw
integer, allocatable :: irow(:), icol(:)
real(psb_dpk_), allocatable :: val(:)
integer :: int_err(5)
character(len=20) :: name, ch_err
name='psb_dilu_fctint'
if(psb_get_errstatus() /= 0) return
info=0
call psb_erractionsave(err_act)
call trw%allocate(0,0,info)
if(info /= 0) then
info=4010
ch_err='psb_sp_all'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
lia2(1) = 1
uia2(1) = 1
l1=0
l2=0
m = ma+mb
do i = 1, ma
d(i) = dzero
!
!
if ((mod(i,nrb) == 1).or.(nrb==1)) then
irb = min(ma-i+1,nrb)
call a%a%csget(i,i+irb-1,trw,info)
if(info /= 0) then
info=4010
ch_err='a%csget'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
nz = trw%get_nzeros()
ktrw=1
end if
do
if (ktrw > nz ) exit
if (trw%ia(ktrw) > i) exit
k = trw%ja(ktrw)
if ((k < i).and.(k >= 1)) then
l1 = l1 + 1
laspk(l1) = trw%val(ktrw)
lia1(l1) = k
else if (k == i) then
d(i) = trw%val(ktrw)
else if ((k > i).and.(k <= m)) then
l2 = l2 + 1
uaspk(l2) = trw%val(ktrw)
uia1(l2) = k
end if
ktrw = ktrw + 1
enddo
!!$
lia2(i+1) = l1 + 1
uia2(i+1) = l2 + 1
dia = d(i)
do kk = lia2(i), lia2(i+1) - 1
!
! compute element alo(i,k) of incomplete factorization
!
temp = laspk(kk)
k = lia1(kk)
laspk(kk) = temp*d(k)
! update the rest of row i using alo(i,k)
low1 = kk + 1
low2 = uia2(i)
updateloop: do jj = uia2(k), uia2(k+1) - 1
j = uia1(jj)
!
if (j < i) then
! search alo(i,*) for matching index J
do ll = low1, lia2(i+1) - 1
l = lia1(ll)
if (l > j) then
low1 = ll
exit
else if (l == j) then
laspk(ll) = laspk(ll) - temp*uaspk(jj)
low1 = ll + 1
cycle updateloop
end if
enddo
!
else if (j == i) then
! j=i update diagonal
! write(0,*)'aggiorno dia',dia,'temp',temp,'jj',jj,'u%aspk',uaspk(jj)
dia = dia - temp*uaspk(jj)
! write(0,*)'dia',dia,'temp',temp,'jj',jj,'aspk',uaspk(jj)
cycle updateloop
!
else if (j > i) then
! search aup(i,*) for matching index j
do ll = low2, uia2(i+1) - 1
l = uia1(ll)
if (l > j) then
low2 = ll
exit
else if (l == j) then
uaspk(ll) = uaspk(ll) - temp*uaspk(jj)
low2 = ll + 1
cycle updateloop
end if
enddo
end if
!
! for milu al=1.; for ilu al=0.
! al = 1.d0
! dia = dia - al*temp*aup(jj)
enddo updateloop
enddo
!
!
! Non singularity
!
if (dabs(dia) < epstol) then
!
! Pivot too small: unstable factorization
!
info = 2
int_err(1) = i
write(ch_err,'(g20.10)') dia
call psb_errpush(info,name,i_err=int_err,a_err=ch_err)
goto 9999
else
dia = done/dia
end if
d(i) = dia
! write(6,*)'diag(',i,')=',d(i)
! Scale row i of upper triangle
do kk = uia2(i), uia2(i+1) - 1
uaspk(kk) = uaspk(kk)*dia
enddo
enddo
do i = ma+1, m
d(i) = dzero
!!$ if ((mod(i,nrb) == 1).or.(nrb==1)) then
!!$ irb = min(ma-i+1,nrb)
!!$ call b%csget(i-ma,i-ma+irb-1,trw,info)
!!$ nz = trw%get_nzeros()
!!$ if(info /= 0) then
!!$ info=4010
!!$ ch_err='a%csget'
!!$ call psb_errpush(info,name,a_err=ch_err)
!!$ goto 9999
!!$ end if
!!$ ktrw=1
!!$ end if
!!$
!!$ do
!!$ if (ktrw > nz ) exit
!!$ if (trw%ia(ktrw) > i) exit
!!$ k = trw%ja(ktrw)
!!$ if ((k < i).and.(k >= 1)) then
!!$ l1 = l1 + 1
!!$ laspk(l1) = trw%val(ktrw)
!!$ lia1(l1) = k
!!$ else if (k == i) then
!!$ d(i) = trw%val(ktrw)
!!$ else if ((k > i).and.(k <= m)) then
!!$ l2 = l2 + 1
!!$ uaspk(l2) = trw%val(ktrw)
!!$ uia1(l2) = k
!!$ end if
!!$ ktrw = ktrw + 1
!!$ enddo
lia2(i+1) = l1 + 1
uia2(i+1) = l2 + 1
dia = d(i)
do kk = lia2(i), lia2(i+1) - 1
!
! compute element alo(i,k) of incomplete factorization
!
temp = laspk(kk)
k = lia1(kk)
laspk(kk) = temp*d(k)
! update the rest of row i using alo(i,k)
low1 = kk + 1
low2 = uia2(i)
updateloopb: do jj = uia2(k), uia2(k+1) - 1
j = uia1(jj)
!
if (j < i) then
! search alo(i,*) for matching index J
do ll = low1, lia2(i+1) - 1
l = lia1(ll)
if (l > j) then
low1 = ll
exit
else if (l == j) then
laspk(ll) = laspk(ll) - temp*uaspk(jj)
low1 = ll + 1
cycle updateloopb
end if
enddo
!
else if (j == i) then
! j=i update diagonal
dia = dia - temp*uaspk(jj)
cycle updateloopb
!
else if (j > i) then
! search aup(i,*) for matching index j
do ll = low2, uia2(i+1) - 1
l = uia1(ll)
if (l > j) then
low2 = ll
exit
else if (l == j) then
uaspk(ll) = uaspk(ll) - temp*uaspk(jj)
low2 = ll + 1
cycle updateloopb
end if
enddo
end if
!
! for milu al=1.; for ilu al=0.
! al = 1.d0
! dia = dia - al*temp*aup(jj)
enddo updateloopb
enddo
!
!
! Non singularity
!
if (dabs(dia) < epstol) then
!
! Pivot too small: unstable factorization
!
int_err(1) = i
write(ch_err,'(g20.10)') dia
info = 2
call psb_errpush(info,name,i_err=int_err,a_err=ch_err)
goto 9999
else
dia = done/dia
end if
d(i) = dia
! Scale row i of upper triangle
do kk = uia2(i), uia2(i+1) - 1
uaspk(kk) = uaspk(kk)*dia
enddo
enddo
call trw%free()
call psb_erractionrestore(err_act)
return
9999 continue
call psb_erractionrestore(err_act)
if (err_act == psb_act_abort_) then
call psb_error()
return
end if
return
end subroutine psb_dilu_fctint
end subroutine psb_dilu_fct