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157 lines
5.5 KiB
Fortran
157 lines
5.5 KiB
Fortran
!
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! Parallel Sparse BLAS version 3.5
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! (C) Copyright 2006-2018
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! Salvatore Filippone
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! Alfredo Buttari
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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 PSBLAS 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 PSBLAS 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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!
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! Subroutine: psb_cd_renum_block
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! Produces a renumbered version of the input descriptor, with
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! global indices in a BLOCK distribution.
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!
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! Arguments:
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! desc_in - type(psb_desc_type). The communication descriptor to be cloned.
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! desc_out - type(psb_desc_type). The output communication descriptor.
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! info - integer. Return code.
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subroutine psb_cd_renum_block(desc_in, desc_out, info)
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use psb_base_mod, psb_protect_name => psb_cd_renum_block
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implicit none
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!....parameters...
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type(psb_desc_type), intent(inout) :: desc_in
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type(psb_desc_type), intent(out) :: desc_out
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integer(psb_ipk_), intent(out) :: info
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!locals
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type(psb_gen_block_map), allocatable :: blck_map
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integer(psb_ipk_), allocatable :: lidx(:),reflidx(:)
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integer(psb_lpk_), allocatable :: gidx(:),vnl(:)
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integer(psb_ipk_) :: i, n_row, n_col
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integer(psb_lpk_) :: li, n_glob_row, n_glob_col
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type(psb_ctxt_type) :: ctxt
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integer(psb_ipk_) :: np, me, err_act
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integer(psb_ipk_) :: debug_level, debug_unit
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character(len=20) :: name
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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if (psb_get_errstatus() /= 0) return
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info = psb_success_
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call psb_erractionsave(err_act)
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name = 'psb_cd_renum_block'
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ctxt = desc_in%get_context()
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! check on blacs grid
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call psb_info(ctxt, me, np)
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if (debug_level >= psb_debug_ext_) &
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& write(debug_unit,*) me,' ',trim(name),': Entered'
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if (np == -1) then
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info = psb_err_context_error_
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call psb_errpush(info,name)
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goto 9999
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endif
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call desc_in%clone(desc_out,info)
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if (desc_in%is_ovl()) then
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write(0,*) 'Warning: descriptor with overlap, not going to clone into BLOCK'
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else
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!
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! Ok, convert into a GEN BLOCK.
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!
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allocate(psb_gen_block_map :: blck_map, stat=info)
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if (info == 0) allocate(vnl(0:np),stat=info)
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if (info /= 0) then
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info = psb_err_alloc_dealloc_
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call psb_errpush(info,name)
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goto 9999
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endif
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n_row = desc_in%get_local_rows()
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n_col = desc_in%get_local_cols()
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n_glob_row = desc_in%get_global_rows()
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n_glob_col = desc_in%get_global_cols()
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vnl = 0
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vnl(me) = n_row
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call psb_sum(ctxt,vnl)
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vnl(1:np) = vnl(0:np-1)
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vnl(0) = 0
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do i=1,np
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vnl(i) = vnl(i-1)+vnl(i)
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end do
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allocate(lidx(n_col),reflidx(n_col),gidx(n_col),stat=info)
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if (info /= 0) then
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info = psb_err_alloc_dealloc_
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call psb_errpush(info,name)
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goto 9999
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endif
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!
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! A GEN_BLOCK distribution would just assign indices 1:N_R0
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! to process 0, N_R0+1:N_R0+N_R1 to process 1 and so on;
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! once these are set you can get the others by invoking
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! HALO on the old descriptor, then put the map into the new
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! one. Halo lists are stored in local indices, so they will
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! continue to work since local indices stay the same, it's
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! only the global indices that were reshuffled.
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!
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reflidx(1:n_col) = [(i,i=1,n_col)]
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gidx(1:n_row) = reflidx(1:n_row) + vnl(me)
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call psb_halo(gidx,desc_in,info)
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if (info == 0) call blck_map%gen_block_map_init(ctxt,n_row,info)
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if (info == 0) call blck_map%g2l_ins(gidx,lidx,info,lidx=reflidx)
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if (info == 0) call blck_map%asb(info)
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if (info == 0) call &
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& psb_safe_ab_cpy(desc_in%indxmap%halo_owner,blck_map%halo_owner,info)
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if (info /= psb_success_) then
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info = psb_err_from_subroutine_
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call psb_errpush(info,name)
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goto 9999
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endif
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call move_alloc(blck_map,desc_out%indxmap)
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end if
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if (info /= psb_success_) then
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info = psb_err_from_subroutine_
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call psb_errpush(info,name)
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goto 9999
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endif
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if (debug_level >= psb_debug_ext_) &
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& write(debug_unit,*) me,' ',trim(name),': Done'
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(ctxt,err_act)
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return
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end subroutine psb_cd_renum_block
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