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@ -164,6 +164,7 @@ subroutine amg_c_soc2_map_bld(iorder,theta,clean_zeros,a,desc_a,nlaggr,ilaggr,in
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! Compute the 1-neigbour; mark strong links with +1, weak links with -1
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!
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call s_neigh_coo%allocate(nr,nr,muij%get_nzeros())
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!$omp parallel do private(i,j,k) shared(nr,diag,muij) schedule(static)
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do i=1, nr
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do k=muij%irp(i),muij%irp(i+1)-1
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j = muij%ja(k)
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@ -180,6 +181,7 @@ subroutine amg_c_soc2_map_bld(iorder,theta,clean_zeros,a,desc_a,nlaggr,ilaggr,in
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end if
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end do
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end do
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!$omp end parallel do
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!write(*,*) 'S_NEIGH: ',nr,ip
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call s_neigh_coo%set_nzeros(muij%get_nzeros())
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call s_neigh%mv_from_coo(s_neigh_coo,info)
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@ -210,9 +212,62 @@ subroutine amg_c_soc2_map_bld(iorder,theta,clean_zeros,a,desc_a,nlaggr,ilaggr,in
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!
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naggr = 0
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#if defined(OPENMP)
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icnt = 0
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step1: do ii=1, nr
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block
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integer(psb_ipk_), allocatable :: bnds(:), locnaggr(:)
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integer(psb_ipk_) :: myth,nths, kk
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! The parallelization makes use of a locaggr(:) array; each thread
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! keeps its own version of naggr, and when the loop ends, a prefix is applied
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! to locnaggr to determine:
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! 1. The total number of aggregaters NAGGR;
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! 2. How much should each thread shift its own aggregates
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! Part 2 requires to keep track of which thread defined each entry
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! of ilaggr(), so that each entry can be adjusted correctly: even
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! if an entry I belongs to the range BNDS(TH)>BNDS(TH+1)-1, it may have
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! been set because it is strongly connected to an entry J belonging to a
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! different thread.
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!$omp parallel shared(s_neigh,bnds,idxs,locnaggr,ilaggr,nr,naggr,diag,theta,nths,info) &
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!$omp private(icol,val,myth,kk)
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block
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integer(psb_ipk_) :: ii,nlp,k,kp,n,ia,isz,nc,i,j,m,nz,ilg,ip,rsz,ip1,nzcnt
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integer(psb_lpk_) :: itmp
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!$omp master
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nths = omp_get_num_threads()
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allocate(bnds(0:nths),locnaggr(0:nths+1))
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locnaggr(:) = 0
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bnds(0) = 1
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!$omp end master
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!$omp barrier
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myth = omp_get_thread_num()
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rsz = nr/nths
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if (myth < mod(nr,nths)) rsz = rsz + 1
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bnds(myth+1) = rsz
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!$omp barrier
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!$omp master
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do i=1,nths
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bnds(i) = bnds(i) + bnds(i-1)
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end do
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info = 0
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!$omp end master
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!$omp barrier
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!$omp do schedule(static) private(disjoint)
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do kk=0, nths-1
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step1: do ii=bnds(kk), bnds(kk+1)-1
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i = idxs(ii)
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if (info /= 0) then
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write(0,*) ' Step1:',kk,ii,i,info
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cycle step1
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end if
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if ((i<1).or.(i>nr)) then
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!$omp atomic write
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info=psb_err_internal_error_
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!$omp end atomic
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call psb_errpush(info,name)
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cycle step1
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!goto 9999
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end if
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if (ilaggr(i) == -(nr+1)) then
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!
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@ -231,23 +286,81 @@ subroutine amg_c_soc2_map_bld(iorder,theta,clean_zeros,a,desc_a,nlaggr,ilaggr,in
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ilaggr(i) = 0
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cycle step1
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end if
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nzcnt = count(real(s_neigh%val(ip1:ip1+nz-1)) > 0)
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icol(1:nzcnt) = pack(s_neigh%ja(ip1:ip1+nz-1),(real(s_neigh%val(ip1:ip1+nz-1)) > 0))
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disjoint = all(ilaggr(icol(1:nzcnt)) == -(nr+1))
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!
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! If the whole strongly coupled neighborhood of I is
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! as yet unconnected, turn it into the next aggregate.
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! Same if ip==0 (in which case, neighborhood only
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! contains I even if it does not look like it from matrix)
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! The fact that DISJOINT is private and not under lock
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! generates a certain un-repeatability, in that between
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! computing DISJOINT and assigning, another thread might
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! alter the values of ILAGGR.
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! However, a certain unrepeatability is already present
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! because the sequence of aggregates is computed with a
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! different order than in serial mode.
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! In any case, even if the enteries of ILAGGR may be
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! overwritten, the important thing is that each entry is
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! consistent and they generate a correct aggregation map.
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!
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nzcnt = count(real(s_neigh%val(ip1:ip1+nz-1)) > 0)
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icol(1:nzcnt) = pack(s_neigh%ja(ip1:ip1+nz-1),(real(s_neigh%val(ip1:ip1+nz-1)) > 0))
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disjoint = all(ilaggr(icol(1:nzcnt)) == -(nr+1))
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if (disjoint) then
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icnt = icnt + 1
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naggr = naggr + 1
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locnaggr(kk) = locnaggr(kk) + 1
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itmp = (bnds(kk)-1+locnaggr(kk))*nths+kk
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if (itmp < (bnds(kk)-1+locnaggr(kk))) then
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!$omp atomic update
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info = max(12345678,info)
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!$omp end atomic
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cycle step1
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end if
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!$omp atomic write
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ilaggr(i) = itmp
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!$omp end atomic
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do k=1, nzcnt
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ilaggr(icol(k)) = naggr
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!$omp atomic write
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ilaggr(icol(k)) = itmp
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!$omp end atomic
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end do
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ilaggr(i) = naggr
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end if
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endif
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end if
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enddo step1
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end do
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!$omp end do
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!$omp master
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naggr = sum(locnaggr(0:nths-1))
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do i=1,nths
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locnaggr(i) = locnaggr(i) + locnaggr(i-1)
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end do
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do i=nths+1,1,-1
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locnaggr(i) = locnaggr(i-1)
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end do
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locnaggr(0) = 0
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!write(0,*) 'LNAG ',locnaggr(nths+1)
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!$omp end master
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!$omp barrier
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!$omp do schedule(static)
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do kk=0, nths-1
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do ii=bnds(kk), bnds(kk+1)-1
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if (ilaggr(ii) > 0) then
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kp = mod(ilaggr(ii),nths)
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ilaggr(ii) = (ilaggr(ii)/nths)- (bnds(kp)-1) + locnaggr(kp)
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end if
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end do
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end do
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!$omp end do
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end block
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!$omp end parallel
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end block
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if (info /= 0) then
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if (info == 12345678) write(0,*) 'Overflow in encoding ILAGGR'
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info=psb_err_internal_error_
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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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#else
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icnt = 0
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sfilippone
1 year ago