! ! 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_extract_dep_list(ictxt,is_bld,is_upd,desc_str,dep_list,& & length_dl,dl_lda,mode,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. ! ! mode integer (global input) ! if mode =0 then will be inserted also duplicate element in ! a same dependence list ! if mode =1 then not will be inserted duplicate element in ! a same dependence list ! output ! == = == ! only for root (pid=0) process: ! dep_list integer array(dl_lda,0:np) ! dependence list dep_list(*,i) is the list of process identifiers to which process i ! must communicate with. this list with its order is extracted from ! desc_str list. ! length_dl integer array(0:np) ! length_dl(i) is the length of dep_list(*,i) list use psi_mod, psb_protect_name => psi_i_extract_dep_list #ifdef MPI_MOD use mpi #endif use psb_penv_mod use psb_const_mod use psb_error_mod use psb_desc_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,mode integer(psb_ipk_), intent(out) :: dl_lda integer(psb_ipk_), intent(in) :: desc_str(*) integer(psb_ipk_), allocatable, intent(out) :: dep_list(:,:),length_dl(:) integer(psb_ipk_), intent(out) :: info ! .....local arrays.... integer(psb_ipk_) :: int_err(5) integer(psb_ipk_), allocatable :: itmp(:) ! .....local scalars... integer(psb_ipk_) :: i,pointer_dep_list,proc,j,err_act integer(psb_ipk_) :: err integer(psb_ipk_) :: debug_level, debug_unit integer(psb_mpk_) :: iictxt, icomm, me, np, minfo 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) allocate(itmp(np+1),length_dl(0:np),stat=info) if (info /= psb_success_) then info=psb_err_alloc_dealloc_ goto 9999 end if do i=0,np length_dl(i) = 0 enddo i=1 if (debug_level >= psb_debug_inner_)& & write(debug_unit,*) me,' ',trim(name),': start ',info pointer_dep_list=1 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' if (mode == 1) then ! ...search if already exist proc ! in itmp(*)... j=1 do while ((j < pointer_dep_list).and.& & (itmp(j) /= proc)) j=j+1 enddo if (j == pointer_dep_list) then ! ...if not found..... itmp(pointer_dep_list)=proc pointer_dep_list=pointer_dep_list+1 endif else if (mode == 0) then itmp(pointer_dep_list)=proc pointer_dep_list=pointer_dep_list+1 endif 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 if (mode == 1) then ! ...search if already exist proc.... j=1 do while ((j < pointer_dep_list).and.& & (itmp(j) /= proc)) j=j+1 enddo if (j == pointer_dep_list) then ! ...if not found..... itmp(pointer_dep_list)=proc pointer_dep_list=pointer_dep_list+1 endif else if (mode == 0) then itmp(pointer_dep_list)=proc pointer_dep_list=pointer_dep_list+1 endif endif i=i+desc_str(i+1)+2 enddo else info = 2020 goto 9999 endif length_dl(me)=pointer_dep_list-1 dl_lda = max(length_dl(me),1) call psb_max(iictxt, dl_lda) ! ! This doubling of DL_LDA is not 100% safe, ! but should work most of the time. ! Will need to be improved later, perhaps move ! from a 2D allocation (ellpack style) to ! a 1D allocation (csr like). ! dl_lda = min(2*dl_lda,np+1) allocate(dep_list(dl_lda,0:np),stat=info) if (info /= psb_success_) then call psb_errpush(psb_err_from_subroutine_,name,a_err='Allocate') goto 9999 end if call psb_sum(iictxt,length_dl(0:np)) call psb_get_mpicomm(iictxt,icomm ) call mpi_allgather(itmp,dl_lda,psb_mpi_ipk_,& & dep_list,dl_lda,psb_mpi_ipk_,icomm,minfo) info = minfo if (info == 0) deallocate(itmp,stat=info) if (info /= psb_success_) then info=psb_err_alloc_dealloc_ goto 9999 endif 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_extract_dep_list