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