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psblas3/prec/psb_ddiagsc_bld.f90

164 lines
4.8 KiB
Fortran

!!$
!!$ Parallel Sparse BLAS v2.0
!!$ (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
!!$ Alfredo Buttari University of Rome Tor Vergata
!!$
!!$ Redistribution and use in source and binary forms, with or without
!!$ modification, are permitted provided that the following conditions
!!$ are met:
!!$ 1. Redistributions of source code must retain the above copyright
!!$ notice, this list of conditions and the following disclaimer.
!!$ 2. Redistributions in binary form must reproduce the above copyright
!!$ notice, this list of conditions, and the following disclaimer in the
!!$ documentation and/or other materials provided with the distribution.
!!$ 3. The name of the PSBLAS group or the names of its contributors may
!!$ not be used to endorse or promote products derived from this
!!$ software without specific written permission.
!!$
!!$ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
!!$ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
!!$ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
!!$ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
!!$ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
!!$ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
!!$ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
!!$ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
!!$ POSSIBILITY OF SUCH DAMAGE.
!!$
!!$
subroutine psb_ddiagsc_bld(a,desc_a,p,upd,info)
use psb_base_mod
use psb_prec_mod, psb_protect_name => psb_ddiagsc_bld
Implicit None
type(psb_dspmat_type), target :: a
type(psb_desc_type), intent(in) :: desc_a
type(psb_dprec_type),intent(inout) :: p
character, intent(in) :: upd
integer, intent(out) :: info
! Local scalars
Integer :: err, n_row, n_col,I,j,k,ictxt,&
& me,np,mglob,lw, err_act
real(kind(1.d0)),allocatable :: gd(:), work(:)
integer :: int_err(5)
character :: iupd
logical, parameter :: debug=.false.
integer,parameter :: iroot=0,iout=60,ilout=40
character(len=20) :: name, ch_err
if(psb_get_errstatus().ne.0) return
info=0
err=0
call psb_erractionsave(err_act)
name = 'psb_diagsc_bld'
if (debug) write(0,*) 'Entering diagsc_bld'
info = 0
int_err(1) = 0
ictxt = psb_cd_get_context(desc_a)
n_row = psb_cd_get_local_rows(desc_a)
n_col = psb_cd_get_local_cols(desc_a)
mglob = psb_cd_get_global_rows(desc_a)
if (debug) write(0,*) 'Preconditioner Blacs_gridinfo'
call psb_info(ictxt, me, np)
if (debug) write(0,*) 'Precond: Diagonal scaling'
! diagonal scaling
call psb_realloc(n_col,p%d,info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='psb_realloc')
goto 9999
end if
call psb_csrws(p%d,a,info,trans='N')
if(info /= 0) then
info=4010
ch_err='psb_csrws'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
call psb_cdcpy(desc_a,p%desc_Data,info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='psb_cdcpy')
goto 9999
end if
if (debug) write(ilout+me,*) 'VDIAG ',n_row
do i=1,n_row
if (p%d(i).eq.dzero) then
p%d(i) = done
else
p%d(i) = done/p%d(i)
endif
if (debug) write(ilout+me,*) i,desc_a%loc_to_glob(i), p%d(i)
if (p%d(i).lt.0.d0) then
write(0,*) me,'Negative RWS? ',i,p%d(i)
endif
end do
if (a%pl(1) /= 0) then
allocate(work(n_row),stat=info)
if (info /= 0) then
info=4000
call psb_errpush(info,name)
goto 9999
end if
call psb_gelp('n',a%pl,p%d,desc_a,info)
if(info /= 0) then
info=4010
ch_err='psb_dgelp'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
deallocate(work)
endif
if (debug) then
allocate(gd(mglob),stat=info)
if (info /= 0) then
call psb_errpush(4010,name,a_err='Allocate')
goto 9999
end if
call psb_gather(gd, p%d, desc_a, info, root=iroot)
if(info /= 0) then
info=4010
ch_err='psb_dgatherm'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
if (me.eq.iroot) then
write(iout+np,*) 'VDIAG CHECK ',mglob
do i=1,mglob
write(iout+np,*) i,gd(i)
enddo
endif
deallocate(gd)
endif
if (debug) write(*,*) 'Preconditioner DIAG computed OK'
call psb_erractionrestore(err_act)
return
9999 continue
call psb_erractionrestore(err_act)
if (err_act.eq.psb_act_abort_) then
call psb_error()
return
end if
return
end subroutine psb_ddiagsc_bld