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!
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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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subroutine psi_i_xtr_loc_dl(ctxt,is_bld,is_upd,desc_str,loc_dl,length_dl,info)
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! internal routine
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! == = =============
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!
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! _____called by psi_crea_halo and psi_crea_ovrlap ______
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!
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! purpose
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! == = ====
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! process root (pid=0) extracts for each process "k" the ordered list of process
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! to which "k" must communicate. this list with its order is extracted from
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! desc_str list
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!
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!
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! input
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! == = ====
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! desc_data :integer array
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! explanation:
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! name explanation
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! ------------------ -------------------------------------------------------
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! desc_data array of integer that contains some local and global
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! information of matrix.
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!
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!
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! now we explain each of the above vectors.
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!
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! let a be a generic sparse matrix. we denote with matdata_a the matrix_data
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! array for matrix a.
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! data stored in matrix_data array are:
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!
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! notation stored in explanation
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! --------------- ---------------------- -------------------------------------
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! dec_type matdata_a[psb_dec_type_] decomposition type
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! m matdata_a[m_] total number of equations
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! n matdata_a[n_] total number of variables
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! n_row matdata_a[psb_n_row_] number of local equations
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! n_col matdata_a[psb_n_col_] number of local variables
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! psb_ctxt_a matdata_a[ctxt_] the blacs context handle, indicating
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! the global context of the operation
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! on the matrix.
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! the context itself is global.
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! desc_str integer array
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! explanation:
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! let desc_str_p be the array desc_str for local process.
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!! this is composed of variable dimension blocks for each process to
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! communicate to.
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! each block contain indexes of local halo elements to exchange with other
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! process.
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! let p be the pointer to the first element of a block in desc_str_p.
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! this block is stored in desc_str_p as :
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!
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! notation stored in explanation
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! --------------- --------------------------- -----------------------------------
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! process_id desc_str_p[p+psb_proc_id_] identifier of process which exchange
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! data with.
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! n_elements_recv desc_str_p[p+n_elem_recv_] number of elements to receive.
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! elements_recv desc_str_p[p+elem_recv_+i] indexes of local elements to
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! receive. these are stored in the
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! array from location p+elem_recv_ to
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! location p+elem_recv_+
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! desc_str_p[p+n_elem_recv_]-1.
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! if desc_data(psb_dec_type_) == 0
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! then also will be:
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! n_elements_send desc_str_p[p+n_elem_send_] number of elements to send.
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! elements_send desc_str_p[p+elem_send_+i] indexes of local elements to
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! send. these are stored in the
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! array from location p+elem_send_ to
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! location p+elem_send_+
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! desc_str_p[p+n_elem_send_]-1.
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! list is ended by -1 value
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!
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! np integer (global input)
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! number of grid process.
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!
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! output
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! == = ==
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! loc_dl integer array(:)
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! dependence list of current process
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!
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use psi_mod, psb_protect_name => psi_i_xtr_loc_dl
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#ifdef MPI_MOD
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use mpi
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#endif
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use psb_penv_mod
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use psb_const_mod
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use psb_error_mod
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use psb_desc_mod
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use psb_sort_mod
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implicit none
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#ifdef MPI_H
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include 'mpif.h'
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#endif
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! ....scalar parameters...
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logical, intent(in) :: is_bld, is_upd
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type(psb_ctxt_type), intent(in) :: ctxt
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integer(psb_ipk_), intent(in) :: desc_str(:)
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integer(psb_ipk_), allocatable, intent(out) :: loc_dl(:), length_dl(:)
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integer(psb_ipk_), intent(out) :: info
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! .....local arrays....
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integer(psb_ipk_) :: int_err(5)
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! .....local scalars...
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integer(psb_ipk_) :: i,pdl,proc,j,err_act, ldu
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integer(psb_ipk_) :: err
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integer(psb_ipk_) :: debug_level, debug_unit
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integer(psb_ipk_) :: me, np
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logical, parameter :: dist_symm_list=.true., print_dl=.false., profile=.true.
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character name*20
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name='psi_extrct_dl'
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call psb_erractionsave(err_act)
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debug_unit = psb_get_debug_unit()
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debug_level = psb_get_debug_level()
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info = psb_success_
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call psb_info(ctxt,me,np)
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pdl = size(desc_str)
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allocate(loc_dl(pdl+1),length_dl(0:np),stat=info)
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if (info /= psb_success_) then
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info=psb_err_alloc_dealloc_
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goto 9999
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end if
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if (debug_level >= psb_debug_inner_)&
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& write(debug_unit,*) me,' ',trim(name),': start ',info
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loc_dl = -1
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i = 1
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pdl = 0
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if (is_bld) then
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do while (desc_str(i) /= -1)
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if (debug_level >= psb_debug_inner_)&
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& write(debug_unit,*) me,' ',trim(name),' : looping ',i,&
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& desc_str(i),desc_str(i+1),desc_str(i+2)
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! ...with different decomposition type we have different
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! structure of indices lists............................
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if ((desc_str(i+1) /= 0).or.(desc_str(i+2) /= 0)) then
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! ..if number of element to be exchanged !=0
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proc=desc_str(i)
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if ((proc < 0).or.(proc >= np)) then
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if (debug_level >= psb_debug_inner_)&
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& write(debug_unit,*) me,' ',trim(name),': error ',i,desc_str(i)
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info = 9999
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int_err(1) = i
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int_err(2) = desc_str(i)
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goto 9999
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endif
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! if((me == 1).and.(proc == 3))write(psb_err_unit,*)'found 3'
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pdl=pdl+1
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loc_dl(pdl)=proc
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endif
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i=i+desc_str(i+1)+2
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enddo
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else if (is_upd) then
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do while (desc_str(i) /= -1)
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if (debug_level >= psb_debug_inner_) &
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& write(debug_unit,*) me,' ',trim(name),': looping ',i,desc_str(i)
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! ...with different decomposition type we have different
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! structure of indices lists............................
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if (desc_str(i+1) /= 0) then
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proc=desc_str(i)
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! ..if number of element to be exchanged !=0
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pdl=pdl+1
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loc_dl(pdl)=proc
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endif
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i=i+desc_str(i+1)+2
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enddo
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else
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info = 2020
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goto 9999
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endif
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call psb_msort_unique(loc_dl(1:pdl),ldu)
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pdl = ldu
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call psb_realloc(pdl,loc_dl,info)
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if (np>1) call psi_symm_dep_list(loc_dl,ctxt,info)
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pdl = size(loc_dl)
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length_dl = 0
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length_dl(me) = pdl
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call psb_sum(ctxt,length_dl)
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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_errpush(info,name,i_err=int_err)
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call psb_error_handler(err_act)
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return
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end subroutine psi_i_xtr_loc_dl
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