!!$ !!$ Parallel Sparse BLAS version 2.2 !!$ (C) Copyright 2006/2007/2008 !!$ Salvatore Filippone University of Rome Tor Vergata !!$ Alfredo Buttari University of Rome Tor Vergata !!$ !!$ 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. 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Purpose ! ======= ! ! Allocate special descriptor for replicated index space. ! ! ! ! INPUT !====== ! M :(Global Input) Integer ! Total number of equations ! required. ! ! ictxt : (Global Input)Integer BLACS context for an NPx1 grid ! required. ! ! OUTPUT !========= ! desc : TYPEDESC ! desc OUTPUT FIELDS: ! ! MATRIX_DATA : Pointer to integer Array ! contains some ! local and global information about matrix: ! ! NOTATION STORED IN EXPLANATION ! ------------ ---------------------- ------------------------------------- ! DEC_TYPE MATRIX_DATA[DEC_TYPE_] Decomposition type, temporarly is ! setted to 1( matrix not yet assembled) ! M MATRIX_DATA[M_] Total number of equations ! N MATRIX_DATA[N_] Total number of variables ! N_ROW MATRIX_DATA[N_ROW_] Number of local equations ! N_COL MATRIX_DATA[N_COL_] Number of local columns (see below) ! CTXT_A MATRIX_DATA[CTXT_] The BLACS context handle, ! indicating ! the global context of the operation ! on the matrix. ! The context itself is global. ! ! GLOB_TO_LOC Array of dimension equal to number of global ! rows/cols (MATRIX_DATA[M_]). On exit, ! for all global indices either: ! 1. The index belongs to the current process; the entry ! is set to the next free local row index. ! 2. The index belongs to process P (0<=P<=NP-1); the entry ! is set to ! -(NP+P+1) ! ! LOC_TO_GLOB An array of dimension equal to number of local cols N_COL ! i.e. all columns of the matrix such that there is at least ! one nonzero entry within the local row range. At the time ! this routine is called N_COL cannot be know, so we set ! N_COL=N_ROW, and dimension this vector on N_ROW plus an ! estimate. On exit the vector elements are set ! to the index of the corresponding entry in GLOB_TO_LOC, or ! to -1 for indices I>N_ROW. ! ! ! HALO_INDEX Not touched here, as it depends on the matrix pattern ! ! OVRLAP_INDEX On exit from this routine, the overlap indices are stored in ! triples (Proc, 1, Index), similar to the assembled format ! but neither optimized, nor deadlock free. ! List is terminated with -1 ! ! OVRLAP_ELEM On exit from this routine, just a list of pairs (index,#p). ! List is terminated with -1. ! ! ! END OF desc OUTPUT FIELDS ! ! subroutine psb_cdrep(m, ictxt, desc, info) use psb_sparse_mod use psi_mod implicit None !....Parameters... Integer, intent(in) :: m,ictxt integer, intent(out) :: info Type(psb_desc_type), intent(out) :: desc !locals Integer :: i,np,me,err,n,err_act integer :: int_err(5),exch(2), thalo(1), tovr(1), text(1) integer :: debug_level, debug_unit character(len=20) :: name if(psb_get_errstatus() /= 0) return info=0 err=0 name = 'psb_cdrep' debug_unit = psb_get_debug_unit() debug_level = psb_get_debug_level() call psb_info(ictxt, me, np) if (debug_level >= psb_debug_ext_) & & write(debug_unit,*) me,' ',trim(name),': ',np n = m !... check m and n parameters.... if (m < 1) then info = 10 int_err(1) = 1 int_err(2) = m else if (n < 1) then info = 10 int_err(1) = 2 int_err(2) = n endif if (info /= 0) then call psb_errpush(info,name,i_err=int_err) goto 9999 end if if (debug_level >= psb_debug_ext_) & & write(debug_unit,*) me,' ',trim(name),': doing global checks' !global check on m and n parameters if (me == psb_root_) then exch(1)=m exch(2)=n call psb_bcast(ictxt,exch(1:2),root=psb_root_) else call psb_bcast(ictxt,exch(1:2),root=psb_root_) if (exch(1) /= m) then info=550 int_err(1)=1 else if (exch(2) /= n) then info=550 int_err(1)=2 endif endif if (info /= 0) then call psb_errpush(info,name,i_err=int_err) goto 9999 end if call psb_nullify_desc(desc) !count local rows number ! allocate work vector allocate(desc%idxmap%glob_to_loc(m),desc%matrix_data(psb_mdata_size_),& & desc%idxmap%loc_to_glob(m),desc%lprm(1),& & desc%ovrlap_elem(0,3),stat=info) if (info /= 0) then info=4025 int_err(1)=2*m+psb_mdata_size_+1 call psb_errpush(info,name,i_err=int_err,a_err='integer') goto 9999 endif ! If the index space is replicated there's no point in not having ! the full map on the current process. desc%idxmap%state = psb_desc_normal_ desc%matrix_data(psb_m_) = m desc%matrix_data(psb_n_) = n desc%matrix_data(psb_n_row_) = m desc%matrix_data(psb_n_col_) = n desc%matrix_data(psb_ctxt_) = ictxt call psb_get_mpicomm(ictxt,desc%matrix_data(psb_mpi_c_)) desc%matrix_data(psb_dec_type_) = psb_desc_bld_ do i=1,m desc%idxmap%glob_to_loc(i) = i desc%idxmap%loc_to_glob(i) = i enddo tovr = -1 thalo = -1 text = -1 desc%lprm(:) = 0 call psi_cnv_dsc(thalo,tovr,text,desc,info) if (info /= 0) then call psb_errpush(4010,name,a_err='psi_cvn_dsc') goto 9999 end if desc%matrix_data(psb_dec_type_) = psb_desc_repl_ if (debug_level >= psb_debug_ext_) & & write(debug_unit,*) me,' ',trim(name),': end' call psb_erractionrestore(err_act) return 9999 continue call psb_erractionrestore(err_act) if (err_act == psb_act_abort_) then call psb_error(ictxt) return end if return end subroutine psb_cdrep