C C Parallel Sparse BLAS v2.0 C (C) Copyright 2006 Salvatore Filippone University of Rome Tor Vergata C Alfredo Buttari University of Rome Tor Vergata C C Redistribution and use in source and binary forms, with or without C modification, are permitted provided that the following conditions C are met: C 1. Redistributions of source code must retain the above copyright C notice, this list of conditions and the following disclaimer. C 2. Redistributions in binary form must reproduce the above copyright C notice, this list of conditions, and the following disclaimer in the C documentation and/or other materials provided with the distribution. C 3. The name of the PSBLAS group or the names of its contributors may C not be used to endorse or promote products derived from this C software without specific written permission. 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C C subroutine psi_extract_dep_list(desc_data, + desc_str,dep_list, + length_dl,np,dl_lda,mode,info) c internal routine c ================ c c _____called by psi_crea_halo and psi_crea_ovrlap ______ c c purpose c ======= c process root (pid=0) extracts for each process "k" the ordered list of process c to which "k" must communicate. this list with its order is extracted from c desc_str list c c c input c ======= c desc_data :integer array c explanation: c name explanation c ------------------ ------------------------------------------------------- c desc_data array of integer that contains some local and global c information of matrix. c c c now we explain each of the above vectors. c c let a be a generic sparse matrix. we denote with matdata_a the matrix_data c array for matrix a. c data stored in matrix_data array are: c c notation stored in explanation c --------------- ---------------------- ------------------------------------- c dec_type matdata_a[psb_dec_type_] decomposition type c m matdata_a[m_] total number of equations c n matdata_a[n_] total number of variables c n_row matdata_a[psb_n_row_] number of local equations c n_col matdata_a[psb_n_col_] number of local variables c psb_ctxt_a matdata_a[ctxt_] the blacs context handle, indicating c the global context of the operation c on the matrix. c the context itself is global. c desc_str integer array c explanation: c let desc_str_p be the array desc_str for local process. c this is composed of variable dimension blocks for each process to c communicate to. c each block contain indexes of local halo elements to exchange with other c process. c let p be the pointer to the first element of a block in desc_str_p. c this block is stored in desc_str_p as : c c notation stored in explanation c --------------- --------------------------- ----------------------------------- c process_id desc_str_p[p+psb_proc_id_] identifier of process which exchange c data with. c n_elements_recv desc_str_p[p+n_elem_recv_] number of elements to receive. c elements_recv desc_str_p[p+elem_recv_+i] indexes of local elements to c receive. these are stored in the c array from location p+elem_recv_ to c location p+elem_recv_+ c desc_str_p[p+n_elem_recv_]-1. c if desc_data(psb_dec_type_) == 0 c then also will be: c n_elements_send desc_str_p[p+n_elem_send_] number of elements to send. c elements_send desc_str_p[p+elem_send_+i] indexes of local elements to c send. these are stored in the c array from location p+elem_send_ to c location p+elem_send_+ c desc_str_p[p+n_elem_send_]-1. c list is ended by -1 value c c np integer (global input) c number of grid process. c c mode integer (global input) c if mode =0 then will be inserted also duplicate element in c a same dependence list c if mode =1 then not will be inserted duplicate element in c a same dependence list c output c ===== c only for root (pid=0) process: c dep_list integer array(dl_lda,0:np) c dependence list dep_list(*,i) is the list of process identifiers to which process i c must communicate with. this list with its order is extracted from c desc_str list. c length_dl integer array(0:np) c length_dl(i) is the length of dep_list(*,i) list use psb_penv_mod use psb_const_mod use psb_descriptor_type implicit none include 'mpif.h' c ....scalar parameters... integer np,dl_lda,mode, info c ....array parameters.... integer desc_str(*),desc_data(*), + dep_list(dl_lda,0:np),length_dl(0:np) integer, pointer :: itmp(:) c .....local arrays.... integer int_err(5) double precision real_err(5) c .....local scalars... integer i,nprow,npcol,me,mycol,pointer_dep_list,proc,j,err_act integer ictxt, err, icomm logical debug parameter (debug=.false.) character name*20 name='psi_extrct_dl' call fcpsb_get_erraction(err_act) info = 0 ictxt = desc_data(psb_ctxt_) call psb_info(ictxt,me,nprow) do i=0,np length_dl(i) = 0 enddo i=1 if (debug) write(0,*) 'extract: info ',info, + desc_data(psb_dec_type_) pointer_dep_list=1 c$$$ if (desc_data(psb_dec_type_).eq.psb_desc_bld_) then if (psb_is_bld_dec(desc_data(psb_dec_type_))) then do while (desc_str(i).ne.-1) if (debug) write(0,*) me,' extract: looping ',i, + desc_str(i),desc_str(i+1),desc_str(i+2) c ...with different decomposition type we have different c structure of indices lists............................ if ((desc_str(i+1).ne.0).or.(desc_str(i+2).ne.0)) then c ..if number of element to be exchanged !=0 proc=desc_str(i) if ((proc.lt.0).or.(proc.ge.nprow)) then if (debug) write(0,*) 'extract error ',i,desc_str(i) info = 3999 goto 998 endif ! if((me.eq.1).and.(proc.eq.3))write(0,*)'found 3' if (mode.eq.1) then c ...search if already exist proc c in dep_list(*,me)... j=1 do while ((j.lt.pointer_dep_list).and. + (dep_list(j,me).ne.proc)) j=j+1 enddo if (j.eq.pointer_dep_list) then c ...if not found..... dep_list(pointer_dep_list,me)=proc pointer_dep_list=pointer_dep_list+1 endif else if (mode.eq.0) then if (pointer_dep_list.gt.dl_lda) then info = 4000 goto 998 endif dep_list(pointer_dep_list,me)=proc pointer_dep_list=pointer_dep_list+1 endif endif i=i+desc_str(i+1)+2 enddo c$$$ else if (desc_data(psb_dec_type_).eq.psb_desc_upd_) then else if (psb_is_upd_dec(desc_data(psb_dec_type_))) then do while (desc_str(i).ne.-1) if (debug) write(0,*) 'extract: looping ',i,desc_str(i) c ...with different decomposition type we have different c structure of indices lists............................ if (desc_str(i+1).ne.0) then proc=desc_str(i) c ..if number of element to be exchanged !=0 if (mode.eq.1) then c ...search if already exist proc.... j=1 do while ((j.lt.pointer_dep_list).and. + (dep_list(j,me).ne.proc)) j=j+1 enddo if (j.eq.pointer_dep_list) then c ...if not found..... if (pointer_dep_list.gt.dl_lda) then info = 4000 goto 998 endif dep_list(pointer_dep_list,me)=proc pointer_dep_list=pointer_dep_list+1 endif else if (mode.eq.0) then if (pointer_dep_list.gt.dl_lda) then info = 4000 goto 998 endif dep_list(pointer_dep_list,me)=proc pointer_dep_list=pointer_dep_list+1 endif endif i=i+desc_str(i+1)+2 enddo else write(0,*) 'invalid dec_type',desc_data(psb_dec_type_) info = 2020 goto 9999 endif length_dl(me)=pointer_dep_list-1 c ... check for errors... 998 continue if (debug) write(0,*) 'extract: info ',info err = info if (err.ne.0) goto 9999 call psb_sum(ictxt,length_dl(0:np)) call psb_get_mpicomm(ictxt,icomm ) allocate(itmp(dl_lda),stat=info) if (info /= 0) goto 9999 itmp(1:dl_lda) = dep_list(1:dl_lda,me) call mpi_allgather(itmp,dl_lda,mpi_integer, + dep_list,dl_lda,mpi_integer,icomm,info) deallocate(itmp) return 9999 continue call fcpsb_errpush(info,name,int_err) if(err_act.eq.act_abort) then call fcpsb_perror(ictxt) endif return end