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249 lines
8.1 KiB
Fortran
249 lines
8.1 KiB
Fortran
!
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!
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! AMG-AINV: Approximate Inverse plugin for
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! AMG4PSBLAS version 1.0
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!
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! (C) Copyright 2020
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!
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! Salvatore Filippone 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 AMG4PSBLAS 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 AMG4PSBLAS 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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subroutine psb_csparse_biconjg_s_llk(n,a,p,z,w,nzrmax,sp_thresh,info)
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use psb_base_mod
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use psb_ainv_tools_mod
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use psb_c_biconjg_mod, psb_protect_name => psb_csparse_biconjg_s_llk
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!
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! Left-looking variant SYMMETRIC/HERMITIAN A. You have been warned!
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!
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!
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implicit none
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integer(psb_ipk_), intent(in) :: n
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type(psb_c_csr_sparse_mat), intent(in) :: a
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type(psb_c_csc_sparse_mat), intent(inout) :: z,w
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integer(psb_ipk_), intent(in) :: nzrmax
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real(psb_spk_), intent(in) :: sp_thresh
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complex(psb_spk_), intent(out) :: p(:)
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integer(psb_ipk_), intent(out) :: info
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! Locals
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integer(psb_ipk_), allocatable :: ia(:), ja(:), izkr(:), izcr(:)
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complex(psb_spk_), allocatable :: zval(:),val(:), q(:)
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integer(psb_ipk_) :: i,j,k, kc, kr, err_act, nz, nzra, nzrz, ipzi,ipzj,&
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& nzzi,nzzj, nzz, ip1, ip2, ipza,ipzz, ipzn, nzzn, ipz1, ipz2,&
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& ipj, lastj, nextj, nzw,kk
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type(psb_i_heap) :: heap, rheap
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type(psb_c_csc_sparse_mat) :: ac
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complex(psb_spk_) :: alpha, zvalmax
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character(len=20) :: name='psb_orth_llk'
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logical, parameter :: debug=.false.
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allocate(zval(n),ia(n),val(n),izkr(n),izcr(n),stat=info)
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if (info == psb_success_) call ac%cp_from_fmt(a,info)
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if (info /= psb_success_) then
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call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate')
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return
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end if
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!
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! izkr(i): flag nonzeros in ZVAL. To minimize traffic into heap.
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! izcr(i): flag rows to be used for the dot products. Used to minimize
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! traffic in rheap.
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!
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do i=1,n
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izkr(i) = 0
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izcr(i) = 0
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zval(i) = czero
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end do
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! Init z_1=e_1 and p_1=a_11
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p(1) = czero
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i = 1
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nz = a%irp(i+1) - a%irp(i)
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do j=1,nz
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if (a%ja(j) == 1) then
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p(1) = a%val(j)
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exit
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end if
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end do
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if (abs(p(1)) < s_epstol) &
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& p(1) = 1.d-3
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!
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!
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call z%allocate(n,n,n*nzrmax)
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z%icp(1) = 1
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z%icp(2) = 2
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z%ia(1) = 1
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z%val(1) = cone
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nzz = 1
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zvalmax = cone
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do i = 2, n
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if (debug) write(0,*) 'Main loop iteration ',i,n
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!
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! Update loop on Z.
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! Must be separated from update loop of W because of
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! the conflict on J that would result.
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!
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! ZVAL = e_i
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! !$ do j=1, i-1
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! !$ zval(j) = czero
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! !$ end do
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zval(i) = cone
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izkr(i) = 1
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call heap%init(info)
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if (info == psb_success_) call heap%insert(i,info)
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if (info == psb_success_) call rheap%init(info)
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do j = ac%icp(i), ac%icp(i+1)-1
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if (ac%ia(j) < i) then
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if (info == psb_success_) call rheap%insert(ac%ia(j),info)
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izcr(ac%ia(j)) = 1
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end if
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end do
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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call psb_errpush(info,name,a_err='psb_init_heap')
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return
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end if
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! Update loop
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! The idea is to keep track of the indices of the nonzeros in zval,
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! so as to only do the dot products on the rows which have nonzeros
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! in their positions; to do this we keep an extra
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! copy of A in CSC, and the row indices to be considered are in rheap.
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lastj = -1
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outer: do
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inner: do
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call rheap%get_first(j,info)
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if (debug) write(0,*) 'from get_first: ',j,info
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if (info == -1) exit outer ! Empty heap
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if (j > lastj) then
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lastj = j
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exit inner
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end if
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end do inner
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izcr(j) = 0
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if (j>=i) cycle outer
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if (debug) write(0,*) 'update loop, using row: ',j,i
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ip1 = a%irp(j)
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ip2 = a%irp(j+1) - 1
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do
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if (ip2 < ip1 ) exit
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if (a%ja(ip2) <= n) exit
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ip2 = ip2 -1
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end do
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nzra = max(0,ip2 - ip1 + 1)
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p(i) = psb_spge_dot(nzra,a%ja(ip1:ip2),a%val(ip1:ip2),zval)
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! !$ write(psb_err_unit,*) j,i,p(i)
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alpha = (-p(i)/p(j))
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if (.false..or.(abs(alpha) > sp_thresh)) then
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do k=z%icp(j), z%icp(j+1)-1
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kr = z%ia(k)
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zval(kr) = zval(kr) + alpha*z%val(k)
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!!$ if (abs(zval(kr)) > 1e16) then
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!!$ write(0,*) i,j,p(i),p(j),alpha,z%val(k),alpha*z%val(k),kr,zval(kr)
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!!$ end if
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if (izkr(kr) == 0) then
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call heap%insert(kr,info)
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if (info /= psb_success_) exit
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izkr(kr) = 1
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! We have just added a new nonzero in KR. Thus, we will
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! need to explicitly compute the dot products on all
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! rows j<k<i with nonzeros in column kr; we keep them in
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! a heap.
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!
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do kc = ac%icp(kr), ac%icp(kr+1)-1
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nextj=ac%ia(kc)
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if ((info == psb_success_).and.(izcr(nextj)==0)&
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& .and.(nextj>j).and.(nextj<i)) then
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call rheap%insert(nextj,info)
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izcr(nextj) = 1
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end if
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end do
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if (debug) write(0,*) 'update loop, adding indices: ',&
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& ac%ia(ac%icp(kr):ac%icp(kr+1)-1)
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end if
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if (info /= psb_success_) exit
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end do
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if (info /= psb_success_) then
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info=psb_err_from_subroutine_
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call psb_errpush(info,name,a_err='psb_insert_heap')
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return
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end if
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end if
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end do outer
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call a%csget(i,i,nzra,ia,ja,val,info)
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call rwclip(nzra,ia,ja,val,ione,n,ione,n)
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p(i) = psb_spge_dot(nzra,ja,val,zval)
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!!$ if ((1761<=i).and.(i<=1780)) then
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!!$ write(0,*) 'Dot product terms at ',i,nzra
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!!$ do kk=1,nzra
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!!$ write(0,*) kk,ja(kk),val(kk),zval(ja(kk))
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!!$ end do
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!!$ end if
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if (abs(p(i)) < s_epstol) &
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& p(i) = 1.d-3
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! !$ write(0,*) 'Dropping from a column with: ',i,psb_howmany_heap(heap),sp_thresh
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!
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! Sparsify current ZVAL and put into ZMAT
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!
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call sparsify(i,nzrmax,sp_thresh,n,zval,nzrz,ia,val,info,iheap=heap,ikr=izkr)
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if (info /= psb_success_) then
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info = psb_err_internal_error_
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call psb_errpush(info,name,a_err='sparsify')
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return
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end if
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call psb_ensure_size(nzz+nzrz, z%ia, info)
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call psb_ensure_size(nzz+nzrz, z%val, info)
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ipz1 = z%icp(i)
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do j=1, nzrz
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z%ia(ipz1 + j -1) = ia(j)
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z%val(ipz1 + j -1) = val(j)
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!!$ zvalmax = max(zvalmax,abs(val(j)))
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end do
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z%icp(i+1) = ipz1 + nzrz
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nzz = nzz + nzrz
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!!$ write(0,*) ' Dot: ',i,p(i),zvalmax
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end do
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call z%cp_to_fmt(w,info)
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end subroutine psb_csparse_biconjg_s_llk
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