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123 lines
4.1 KiB
Fortran
123 lines
4.1 KiB
Fortran
!!$
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!!$
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!!$ MD2P4
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!!$ Multilevel Domain Decomposition Parallel Preconditioner Package for PSBLAS
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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 Second 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 MD2P4 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 MD2P4 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 mld_zsludist_bld(a,desc_a,p,info)
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use psb_base_mod
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use psb_prec_mod, mld_protect_name => mld_zsludist_bld
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implicit none
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type(psb_zspmat_type), intent(inout) :: a
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type(psb_desc_type), intent(in) :: desc_a
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type(psb_zbaseprc_type), intent(inout) :: p
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integer, intent(out) :: info
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integer :: i,j,nza,nzb,nzt,ictxt,me,np,err_act,&
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& mglob,ifrst,ibcheck,nrow,ncol,npr,npc, ip
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logical, parameter :: debug=.false.
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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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name='mld_zslu_bld'
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call psb_erractionsave(err_act)
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ictxt = psb_cd_get_context(desc_a)
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call psb_info(ictxt, me, np)
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if (toupper(a%fida) /= 'CSR') then
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write(0,*) 'Unimplemented input to SLU_BLD'
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goto 9999
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endif
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!
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! WARN we need to check for a BLOCK distribution.
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!
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nrow = psb_cd_get_local_rows(desc_a)
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ncol = psb_cd_get_local_cols(desc_a)
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ifrst = desc_a%loc_to_glob(1)
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ibcheck = desc_a%loc_to_glob(nrow) - ifrst + 1
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ibcheck = ibcheck - nrow
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call psb_amx(ictxt,ibcheck)
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if (ibcheck > 0) then
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write(0,*) 'Warning: does not look like a BLOCK distribution'
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endif
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mglob = psb_cd_get_global_rows(desc_a)
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nzt = psb_sp_get_nnzeros(a)
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call psb_loc_to_glob(a%ia1(1:nzt),desc_a,info,iact='I')
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npr = np
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npc = 1
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ip = floor(sqrt(dble(np)))
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do
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if (ip <= 1) exit
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if (mod(np,ip)==0) then
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npr = np/ip
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npc = ip
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exit
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end if
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ip = ip - 1
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end do
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!!$ write(0,*) 'Process grid : ',npr,npc
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call mld_zsludist_factor(mglob,nrow,nzt,ifrst,&
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& a%aspk,a%ia2,a%ia1,p%iprcparm(slud_ptr_),&
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& npr, npc, info)
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if (info /= 0) then
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ch_err='psb_slud_fact'
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call psb_errpush(4110,name,a_err=ch_err,i_err=(/info,0,0,0,0/))
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goto 9999
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end if
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call psb_glob_to_loc(a%ia1(1:nzt),desc_a,info,iact='I')
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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.psb_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 mld_zsludist_bld
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