Split diagsc bld routine.
Salvatore Filippone
19 years ago
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a819e8be43
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!!$
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!!$
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!!$ MPcube: Multilevel Parallel Preconditioners Package
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!!$ for
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!!$ Parallel Sparse BLAS v2.0
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!!$ (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari University of Rome Tor Vergata
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!!$ Daniela Di Serafino II University of Naples
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!!$ Pasqua D'Ambra ICAR-CNR
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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 MPCUBE 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 MPCUBE 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_ddiagsc_bld(a,desc_a,p,upd,info)
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use psb_serial_mod
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Use psb_spmat_type
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use psb_descriptor_type
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use psb_prec_type
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use psb_tools_mod
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use psb_comm_mod
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use psb_const_mod
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use psb_psblas_mod
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use psb_error_mod
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Implicit None
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type(psb_dspmat_type), target :: a
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type(psb_desc_type), intent(in) :: desc_a
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type(psb_dbaseprc_type),intent(inout) :: p
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character, intent(in) :: upd
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integer, intent(out) :: info
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! Local scalars
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Integer :: err, nnzero, n_row, n_col,I,j,k,icontxt,&
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& me,mycol,nprow,npcol,mglob,lw, mtype, nrg, nzg, err_act
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real(kind(1.d0)) :: temp, real_err(5)
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real(kind(1.d0)),pointer :: gd(:), work(:)
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integer :: int_err(5)
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character :: iupd
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logical, parameter :: debug=.false.
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integer,parameter :: iroot=0,iout=60,ilout=40
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character(len=20) :: name, ch_err
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if(psb_get_errstatus().ne.0) return
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info=0
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err=0
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call psb_erractionsave(err_act)
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name = 'psb_diagsc_bld'
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if (debug) write(0,*) 'Entering diagsc_bld'
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info = 0
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int_err(1) = 0
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icontxt = desc_a%matrix_data(psb_ctxt_)
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n_row = desc_a%matrix_data(psb_n_row_)
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n_col = desc_a%matrix_data(psb_n_col_)
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mglob = desc_a%matrix_data(psb_m_)
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if (debug) write(0,*) 'Preconditioner Blacs_gridinfo'
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call blacs_gridinfo(icontxt, nprow, npcol, me, mycol)
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if (debug) write(0,*) 'Precond: Diagonal scaling'
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! diagonal scaling
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call psb_realloc(n_col,p%d,info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='psb_realloc')
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goto 9999
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end if
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call psb_csrws(p%d,a,info,trans='N')
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if(info /= 0) then
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info=4010
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ch_err='psb_csrws'
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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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if (debug) write(ilout+me,*) 'VDIAG ',n_row
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do i=1,n_row
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if (p%d(i).eq.0.0d0) then
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p%d(i)=1.d0
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else
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p%d(i) = 1.d0/p%d(i)
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endif
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if (debug) write(ilout+me,*) i,desc_a%loc_to_glob(i), p%d(i)
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if (p%d(i).lt.0.d0) then
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write(0,*) me,'Negative RWS? ',i,p%d(i)
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endif
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end do
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if (a%pl(1) /= 0) then
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allocate(work(n_row),stat=info)
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if (info /= 0) then
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info=4000
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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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call psb_gelp('n',a%pl,p%d,desc_a,info)
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if(info /= 0) then
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info=4010
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ch_err='psb_dgelp'
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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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deallocate(work)
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endif
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if (debug) then
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allocate(gd(mglob),stat=info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='Allocate')
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goto 9999
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end if
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call psb_gather(gd, p%d, desc_a, info, iroot=iroot)
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if(info /= 0) then
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info=4010
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ch_err='psb_dgatherm'
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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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if (me.eq.iroot) then
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write(iout+nprow,*) 'VDIAG CHECK ',mglob
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do i=1,mglob
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write(iout+nprow,*) i,gd(i)
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enddo
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endif
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deallocate(gd)
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endif
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if (debug) write(*,*) 'Preconditioner DIAG computed OK'
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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()
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return
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end if
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return
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end subroutine psb_ddiagsc_bld
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