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332 lines
8.3 KiB
Fortran
332 lines
8.3 KiB
Fortran
! File: psb_dhalo.f90
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!
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! Subroutine: psb_dhalom
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! This subroutine performs the exchange of the halo elements in a distributed dense matrix between all the processes.
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!
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! Parameters:
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! x - real,dimension(:,:). The local part of the dense matrix.
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! desc_a - type(<psb_desc_type>). The communication descriptor.
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! info - integer. Eventually returns an error code.
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! alpha - real(optional). ???.
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! jx - integer(optional). The starting column of the global matrix.
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! ik - integer(optional). The number of columns to gather.
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! work - real(optional). A working area.
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! tran - character(optional). ???.
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! mode - integer(optional).
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!
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subroutine psb_dhalom(x,desc_a,info,alpha,jx,ik,work,tran,mode)
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use psb_descriptor_type
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use psb_const_mod
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use psi_mod
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use psb_check_mod
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use psb_realloc_mod
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use psb_error_mod
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implicit none
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real(kind(1.d0)), intent(inout), target :: x(:,:)
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type(psb_desc_type), intent(in) :: desc_a
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integer, intent(out) :: info
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real(kind(1.d0)), intent(in), optional :: alpha
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real(kind(1.d0)), optional, target :: work(:)
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integer, intent(in), optional :: mode,jx,ik
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character, intent(in), optional :: tran
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! locals
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integer :: int_err(5), icontxt, nprow, npcol, myrow, mycol,&
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& err_act, m, n, iix, jjx, temp(2), ix, ijx, k, maxk, nrow, imode, i,&
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& err, liwork, ncol
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real(kind(1.d0)),pointer :: iwork(:), xp(:,:)
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character :: ltran
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character(len=20) :: name, ch_err
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name='psb_dhalom'
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info=0
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call psb_erractionsave(err_act)
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icontxt=desc_a%matrix_data(psb_ctxt_)
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! check on blacs grid
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call blacs_gridinfo(icontxt, nprow, npcol, myrow, mycol)
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if (nprow == -1) then
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info = 2010
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call psb_errpush(info,name)
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goto 9999
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else if (npcol /= 1) then
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info = 2030
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int_err(1) = npcol
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call psb_errpush(info,name)
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goto 9999
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endif
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ix = 1
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if (present(jx)) then
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ijx = jx
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else
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ijx = 1
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endif
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m = desc_a%matrix_data(psb_m_)
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n = desc_a%matrix_data(psb_n_)
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nrow = desc_a%matrix_data(psb_n_row_)
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maxk=size(x,2)-ijx+1
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if(present(ik)) then
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if(ik.gt.maxk) then
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k=maxk
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else
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k=ik
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end if
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else
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k = maxk
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end if
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if (present(tran)) then
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ltran = tran
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else
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ltran = 'N'
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endif
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if (present(mode)) then
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imode = mode
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else
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imode = IOR(psb_swap_send_,psb_swap_recv_)
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endif
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! check vector correctness
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call psb_chkvect(m,1,size(x,1),ix,ijx,desc_a%matrix_data,info,iix,jjx)
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if(info.ne.0) then
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info=4010
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ch_err='psb_chkvect'
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call psb_errpush(info,name,a_err=ch_err)
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end if
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if (iix.ne.1) then
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info=3040
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call psb_errpush(info,name)
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end if
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err=info
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call psb_errcomm(icontxt,err)
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if(err.ne.0) goto 9999
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if(present(alpha)) then
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if(alpha.ne.1.d0) then
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do i=0, k-1
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call dscal(nrow,alpha,x(1,jjx+i),1)
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end do
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end if
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end if
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liwork=ncol
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if (present(work)) then
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if(size(work).ge.liwork) then
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iwork => work
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else
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call psb_realloc(liwork,iwork,info)
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if(info.ne.0) then
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info=4010
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ch_err='psb_realloc'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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end if
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else
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call psb_realloc(liwork,iwork,info)
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if(info.ne.0) then
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info=4010
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ch_err='psb_realloc'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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end if
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! exchange halo elements
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xp => x(iix:size(x,1),jjx:jjx+k-1)
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if(ltran.eq.'N') then
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call psi_swapdata(imode,k,0.d0,xp,&
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& desc_a,iwork,info)
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!!$ call PSI_dSwapData(imode,k,0.d0,x(1,jjx),&
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!!$ & size(x,1),desc_a%matrix_data,&
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!!$ & desc_a%halo_index,iwork,liwork,info)
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else if((ltran.eq.'T').or.(ltran.eq.'H')) then
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call psi_swaptran(imode,k,1.d0,xp,&
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&desc_a,iwork,info)
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!!$ call PSI_dSwapTran(imode,k,1.d0,x(1,jjx),&
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!!$ & size(x,1),desc_a%matrix_data,&
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!!$ & desc_a%halo_index,iwork,liwork,info)
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end if
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if(info.ne.0) then
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ch_err='PSI_dSwap...'
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call psb_errpush(4010,name,a_err=ch_err)
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goto 9999
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end if
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act.eq.act_abort) then
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call psb_error(icontxt)
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return
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end if
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return
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end subroutine psb_dhalom
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! Subroutine: psb_dhalov
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! This subroutine performs the exchange of the halo elements in a distributed dense vector between all the processes.
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!
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! Parameters:
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! x - real,dimension(:). The local part of the dense vector.
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! desc_a - type(<psb_desc_type>). The communication descriptor.
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! info - integer. Eventually returns an error code.
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! alpha - real(optional). ???.
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! work - real(optional). A working area.
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! tran - character(optional). ???.
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! mode - integer(optional).
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!
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subroutine psb_dhalov(x,desc_a,info,alpha,work,tran,mode)
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use psb_descriptor_type
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use psb_const_mod
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use psi_mod
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use psb_check_mod
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use psb_realloc_mod
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use psb_error_mod
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implicit none
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real(kind(1.d0)), intent(inout) :: x(:)
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type(psb_desc_type), intent(in) :: desc_a
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integer, intent(out) :: info
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real(kind(1.d0)), intent(in), optional :: alpha
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real(kind(1.d0)), target, optional :: work(:)
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integer, intent(in), optional :: mode
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character, intent(in), optional :: tran
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! locals
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integer :: int_err(5), icontxt, nprow, npcol, myrow, mycol,&
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& err_act, m, n, iix, jjx, temp(2), ix, ijx, k, maxk, nrow, imode, i,&
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& err, liwork, ncol
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real(kind(1.d0)),pointer :: iwork(:)
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character :: ltran
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character(len=20) :: name, ch_err
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name='psb_dhalom'
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info=0
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call psb_erractionsave(err_act)
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icontxt=desc_a%matrix_data(psb_ctxt_)
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! check on blacs grid
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call blacs_gridinfo(icontxt, nprow, npcol, myrow, mycol)
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if (nprow == -1) then
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info = 2010
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call psb_errpush(info,name)
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goto 9999
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else if (npcol /= 1) then
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info = 2030
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int_err(1) = npcol
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call psb_errpush(info,name)
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goto 9999
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endif
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ix = 1
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ijx = 1
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m = desc_a%matrix_data(psb_m_)
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n = desc_a%matrix_data(psb_n_)
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nrow = desc_a%matrix_data(psb_n_row_)
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if (present(tran)) then
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ltran = tran
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else
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ltran = 'N'
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endif
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if (present(mode)) then
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imode = mode
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else
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imode = IOR(psb_swap_send_,psb_swap_recv_)
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endif
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! check vector correctness
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call psb_chkvect(m,1,size(x,1),ix,ijx,desc_a%matrix_data,info,iix,jjx)
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if(info.ne.0) then
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info=4010
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ch_err='psb_chkvect'
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call psb_errpush(info,name,a_err=ch_err)
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end if
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if (iix.ne.1) then
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info=3040
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call psb_errpush(info,name)
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end if
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err=info
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call psb_errcomm(icontxt,err)
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if(err.ne.0) goto 9999
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if(present(alpha)) then
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if(alpha.ne.1.d0) then
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call dscal(nrow,alpha,x,1)
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end if
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end if
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liwork=ncol
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if (present(work)) then
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if(size(work).ge.liwork) then
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iwork => work
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else
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call psb_realloc(liwork,iwork,info)
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if(info.ne.0) then
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info=4010
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ch_err='psb_realloc'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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end if
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else
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call psb_realloc(liwork,iwork,info)
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if(info.ne.0) then
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info=4010
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ch_err='psb_realloc'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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end if
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! exchange halo elements
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if(ltran.eq.'N') then
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call psi_swapdata(imode,0.d0,x(iix:size(x)),&
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& desc_a,iwork,info)
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else if((ltran.eq.'T').or.(ltran.eq.'H')) then
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call psi_swaptran(imode,1.d0,x(iix:size(x)),&
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& desc_a,iwork,info)
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end if
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if(info.ne.0) then
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ch_err='PSI_dSwap...'
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call psb_errpush(4010,name,a_err=ch_err)
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goto 9999
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end if
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act.eq.act_abort) then
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call psb_error(icontxt)
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return
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end if
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return
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end subroutine psb_dhalov
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