134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/*BHEADER**********************************************************************
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* Copyright (c) 2008, Lawrence Livermore National Security, LLC.
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* Produced at the Lawrence Livermore National Laboratory.
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* This file is part of HYPRE. See file COPYRIGHT for details.
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*
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* HYPRE is free software; you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License (as published by the Free
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* Software Foundation) version 2.1 dated February 1999.
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*
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* $Revision$
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***********************************************************************EHEADER*/
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/******************************************************************************
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*
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*****************************************************************************/
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/* following should be in a header file */
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#include "headers.h"
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/*==========================================================================*/
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/*==========================================================================*/
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/**
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Generates global coarse_size and dof_func for next coarser level
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Notes:
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\begin{itemize}
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\item The routine returns the following:
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\begin{itemize}
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\item an integer array containing the
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function values for the local coarse points
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\item the global number of coarse points
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\end{itemize}
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\end{itemize}
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{\bf Input files:}
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headers.h
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@return Error code.
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@param comm [IN]
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MPI Communicator
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@param local_num_variables [IN]
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number of points on local processor
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@param dof_func [IN]
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array that contains the function numbers for all local points
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@param CF_marker [IN]
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marker array for coarse points
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@param coarse_dof_func_ptr [OUT]
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pointer to array which contains the function numbers for local coarse points
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@param coarse_pnts_global_ptr [OUT]
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pointer to array which contains the number of the first coarse point on each processor and the total number of coarse points in its last element
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@see */
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/*--------------------------------------------------------------------------*/
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int
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hypre_BoomerAMGCoarseParms(MPI_Comm comm,
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int local_num_variables,
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int num_functions,
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int *dof_func,
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int *CF_marker,
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int **coarse_dof_func_ptr,
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int **coarse_pnts_global_ptr)
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{
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int i;
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int ierr = 0;
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int num_procs;
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int local_coarse_size = 0;
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int *coarse_dof_func;
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int *coarse_pnts_global;
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/*--------------------------------------------------------------
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*----------------------------------------------------------------*/
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MPI_Comm_size(comm,&num_procs);
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for (i=0; i < local_num_variables; i++)
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{
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if (CF_marker[i] == 1) local_coarse_size++;
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}
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if (num_functions > 1)
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{
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coarse_dof_func = hypre_CTAlloc(int,local_coarse_size);
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local_coarse_size = 0;
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for (i=0; i < local_num_variables; i++)
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{
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if (CF_marker[i] == 1)
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coarse_dof_func[local_coarse_size++] = dof_func[i];
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}
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*coarse_dof_func_ptr = coarse_dof_func;
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}
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#ifdef HYPRE_NO_GLOBAL_PARTITION
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{
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int scan_recv;
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coarse_pnts_global = hypre_CTAlloc(int,2);
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MPI_Scan(&local_coarse_size, &scan_recv, 1, MPI_INT, MPI_SUM, comm);
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/* first point in my range */
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coarse_pnts_global[0] = scan_recv - local_coarse_size;
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/* first point in next proc's range */
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coarse_pnts_global[1] = scan_recv;
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}
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#else
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coarse_pnts_global = hypre_CTAlloc(int,num_procs+1);
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MPI_Allgather(&local_coarse_size,1,MPI_INT,&coarse_pnts_global[1],
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1,MPI_INT,comm);
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for (i=2; i < num_procs+1; i++)
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coarse_pnts_global[i] += coarse_pnts_global[i-1];
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#endif
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*coarse_pnts_global_ptr = coarse_pnts_global;
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return (ierr);
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}
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