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psblas3/base/internals/psi_xtr_loc_dl.F90

231 lines
8.2 KiB
Fortran

!
! Parallel Sparse BLAS version 3.5
! (C) Copyright 2006-2018
! Salvatore Filippone
! Alfredo Buttari
!
! 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 psi_i_xtr_loc_dl(ictxt,is_bld,is_upd,desc_str,loc_dl,length_dl,info)
! internal routine
! == = =============
!
! _____called by psi_crea_halo and psi_crea_ovrlap ______
!
! purpose
! == = ====
! process root (pid=0) extracts for each process "k" the ordered list of process
! to which "k" must communicate. this list with its order is extracted from
! desc_str list
!
!
! input
! == = ====
! desc_data :integer array
! explanation:
! name explanation
! ------------------ -------------------------------------------------------
! desc_data array of integer that contains some local and global
! information of matrix.
!
!
! now we explain each of the above vectors.
!
! let a be a generic sparse matrix. we denote with matdata_a the matrix_data
! array for matrix a.
! data stored in matrix_data array are:
!
! notation stored in explanation
! --------------- ---------------------- -------------------------------------
! dec_type matdata_a[psb_dec_type_] decomposition type
! m matdata_a[m_] total number of equations
! n matdata_a[n_] total number of variables
! n_row matdata_a[psb_n_row_] number of local equations
! n_col matdata_a[psb_n_col_] number of local variables
! psb_ctxt_a matdata_a[ctxt_] the blacs context handle, indicating
! the global context of the operation
! on the matrix.
! the context itself is global.
! desc_str integer array
! explanation:
! let desc_str_p be the array desc_str for local process.
!! this is composed of variable dimension blocks for each process to
! communicate to.
! each block contain indexes of local halo elements to exchange with other
! process.
! let p be the pointer to the first element of a block in desc_str_p.
! this block is stored in desc_str_p as :
!
! notation stored in explanation
! --------------- --------------------------- -----------------------------------
! process_id desc_str_p[p+psb_proc_id_] identifier of process which exchange
! data with.
! n_elements_recv desc_str_p[p+n_elem_recv_] number of elements to receive.
! elements_recv desc_str_p[p+elem_recv_+i] indexes of local elements to
! receive. these are stored in the
! array from location p+elem_recv_ to
! location p+elem_recv_+
! desc_str_p[p+n_elem_recv_]-1.
! if desc_data(psb_dec_type_) == 0
! then also will be:
! n_elements_send desc_str_p[p+n_elem_send_] number of elements to send.
! elements_send desc_str_p[p+elem_send_+i] indexes of local elements to
! send. these are stored in the
! array from location p+elem_send_ to
! location p+elem_send_+
! desc_str_p[p+n_elem_send_]-1.
! list is ended by -1 value
!
! np integer (global input)
! number of grid process.
!
! output
! == = ==
! loc_dl integer array(:)
! dependence list of current process
!
use psi_mod, psb_protect_name => psi_i_xtr_loc_dl
#ifdef MPI_MOD
use mpi
#endif
use psb_penv_mod
use psb_const_mod
use psb_error_mod
use psb_desc_mod
use psb_sort_mod
implicit none
#ifdef MPI_H
include 'mpif.h'
#endif
! ....scalar parameters...
logical, intent(in) :: is_bld, is_upd
integer(psb_ipk_), intent(in) :: ictxt
integer(psb_ipk_), intent(in) :: desc_str(:)
integer(psb_ipk_), allocatable, intent(out) :: loc_dl(:), length_dl(:)
integer(psb_ipk_), intent(out) :: info
! .....local arrays....
integer(psb_ipk_) :: int_err(5)
! .....local scalars...
integer(psb_ipk_) :: i,pdl,proc,j,err_act, ldu
integer(psb_ipk_) :: err
integer(psb_ipk_) :: debug_level, debug_unit
integer(psb_mpk_) :: iictxt, icomm, me, np, minfo
logical, parameter :: dist_symm_list=.true., print_dl=.false., profile=.true.
character name*20
name='psi_extrct_dl'
call psb_erractionsave(err_act)
debug_unit = psb_get_debug_unit()
debug_level = psb_get_debug_level()
iictxt = ictxt
info = psb_success_
call psb_info(iictxt,me,np)
pdl = size(desc_str)
allocate(loc_dl(pdl+1),length_dl(0:np),stat=info)
if (info /= psb_success_) then
info=psb_err_alloc_dealloc_
goto 9999
end if
if (debug_level >= psb_debug_inner_)&
& write(debug_unit,*) me,' ',trim(name),': start ',info
loc_dl = -1
i = 1
pdl = 0
if (is_bld) then
do while (desc_str(i) /= -1)
if (debug_level >= psb_debug_inner_)&
& write(debug_unit,*) me,' ',trim(name),' : looping ',i,&
& desc_str(i),desc_str(i+1),desc_str(i+2)
! ...with different decomposition type we have different
! structure of indices lists............................
if ((desc_str(i+1) /= 0).or.(desc_str(i+2) /= 0)) then
! ..if number of element to be exchanged !=0
proc=desc_str(i)
if ((proc < 0).or.(proc >= np)) then
if (debug_level >= psb_debug_inner_)&
& write(debug_unit,*) me,' ',trim(name),': error ',i,desc_str(i)
info = 9999
int_err(1) = i
int_err(2) = desc_str(i)
goto 9999
endif
! if((me == 1).and.(proc == 3))write(psb_err_unit,*)'found 3'
pdl=pdl+1
loc_dl(pdl)=proc
endif
i=i+desc_str(i+1)+2
enddo
else if (is_upd) then
do while (desc_str(i) /= -1)
if (debug_level >= psb_debug_inner_) &
& write(debug_unit,*) me,' ',trim(name),': looping ',i,desc_str(i)
! ...with different decomposition type we have different
! structure of indices lists............................
if (desc_str(i+1) /= 0) then
proc=desc_str(i)
! ..if number of element to be exchanged !=0
pdl=pdl+1
loc_dl(pdl)=proc
endif
i=i+desc_str(i+1)+2
enddo
else
info = 2020
goto 9999
endif
call psb_msort_unique(loc_dl(1:pdl),ldu)
pdl = ldu
call psb_realloc(pdl,loc_dl,info)
call psi_symm_dep_list(loc_dl,ictxt,info)
pdl = size(loc_dl)
length_dl = 0
length_dl(me) = pdl
call psb_sum(ictxt,length_dl)
call psb_erractionrestore(err_act)
return
9999 continue
call psb_errpush(info,name,i_err=int_err)
call psb_error_handler(err_act)
return
end subroutine psi_i_xtr_loc_dl