You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
amg4psblas/mld_zslud_bld.f90

123 lines
4.1 KiB
Fortran

!!$
!!$
!!$ MD2P4
!!$ Multilevel Domain Decomposition Parallel Preconditioner Package for PSBLAS
!!$ for
!!$ Parallel Sparse BLAS v2.0
!!$ (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata
!!$ Alfredo Buttari University of Rome Tor Vergata
!!$ Daniela di Serafino Second University of Naples
!!$ Pasqua D'Ambra ICAR-CNR
!!$
!!$ 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 MD2P4 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 MD2P4 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 mld_zsludist_bld(a,desc_a,p,info)
use psb_base_mod
use psb_prec_mod, mld_protect_name => mld_zsludist_bld
implicit none
type(psb_zspmat_type), intent(inout) :: a
type(psb_desc_type), intent(in) :: desc_a
type(psb_zbaseprc_type), intent(inout) :: p
integer, intent(out) :: info
integer :: i,j,nza,nzb,nzt,ictxt,me,np,err_act,&
& mglob,ifrst,ibcheck,nrow,ncol,npr,npc, ip
logical, parameter :: debug=.false.
character(len=20) :: name, ch_err
if(psb_get_errstatus().ne.0) return
info=0
name='mld_zslu_bld'
call psb_erractionsave(err_act)
ictxt = psb_cd_get_context(desc_a)
call psb_info(ictxt, me, np)
if (toupper(a%fida) /= 'CSR') then
write(0,*) 'Unimplemented input to SLU_BLD'
goto 9999
endif
!
! WARN we need to check for a BLOCK distribution.
!
nrow = psb_cd_get_local_rows(desc_a)
ncol = psb_cd_get_local_cols(desc_a)
ifrst = desc_a%loc_to_glob(1)
ibcheck = desc_a%loc_to_glob(nrow) - ifrst + 1
ibcheck = ibcheck - nrow
call psb_amx(ictxt,ibcheck)
if (ibcheck > 0) then
write(0,*) 'Warning: does not look like a BLOCK distribution'
endif
mglob = psb_cd_get_global_rows(desc_a)
nzt = psb_sp_get_nnzeros(a)
call psb_loc_to_glob(a%ia1(1:nzt),desc_a,info,iact='I')
npr = np
npc = 1
ip = floor(sqrt(dble(np)))
do
if (ip <= 1) exit
if (mod(np,ip)==0) then
npr = np/ip
npc = ip
exit
end if
ip = ip - 1
end do
!!$ write(0,*) 'Process grid : ',npr,npc
call mld_zsludist_factor(mglob,nrow,nzt,ifrst,&
& a%aspk,a%ia2,a%ia1,p%iprcparm(slud_ptr_),&
& npr, npc, info)
if (info /= 0) then
ch_err='psb_slud_fact'
call psb_errpush(4110,name,a_err=ch_err,i_err=(/info,0,0,0,0/))
goto 9999
end if
call psb_glob_to_loc(a%ia1(1:nzt),desc_a,info,iact='I')
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 mld_zsludist_bld