324 lines
12 KiB
C
324 lines
12 KiB
C
/*BHEADER**********************************************************************
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* Copyright (c) 2006 The Regents of the University of California.
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* Produced at the Lawrence Livermore National Laboratory.
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* Written by the HYPRE team. UCRL-CODE-222953.
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* All rights reserved.
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*
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* This file is part of HYPRE (see http://www.llnl.gov/CASC/hypre/).
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* Please see the COPYRIGHT_and_LICENSE file for the copyright notice,
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* disclaimer, contact information and the GNU Lesser General Public License.
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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 General Public License (as published by the Free Software
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* Foundation) version 2.1 dated February 1999.
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*
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* HYPRE is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the IMPLIED WARRANTY OF MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the terms and conditions of the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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*****************************************************************************/
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#include "headers.h"
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#include "smg.h"
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/*--------------------------------------------------------------------------
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* hypre_SMGCreateInterpOp
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*--------------------------------------------------------------------------*/
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hypre_StructMatrix *
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hypre_SMGCreateInterpOp( hypre_StructMatrix *A,
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hypre_StructGrid *cgrid,
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int cdir )
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{
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hypre_StructMatrix *PT;
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hypre_StructStencil *stencil;
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hypre_Index *stencil_shape;
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int stencil_size;
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int stencil_dim;
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int num_ghost[] = {1, 1, 1, 1, 1, 1};
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int i;
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/* set up stencil */
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stencil_size = 2;
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stencil_dim = hypre_StructStencilDim(hypre_StructMatrixStencil(A));
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stencil_shape = hypre_CTAlloc(hypre_Index, stencil_size);
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for (i = 0; i < stencil_size; i++)
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{
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hypre_SetIndex(stencil_shape[i], 0, 0, 0);
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}
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hypre_IndexD(stencil_shape[0], cdir) = -1;
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hypre_IndexD(stencil_shape[1], cdir) = 1;
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stencil =
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hypre_StructStencilCreate(stencil_dim, stencil_size, stencil_shape);
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/* set up matrix */
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PT = hypre_StructMatrixCreate(hypre_StructMatrixComm(A), cgrid, stencil);
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hypre_StructMatrixSetNumGhost(PT, num_ghost);
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hypre_StructStencilDestroy(stencil);
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return PT;
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}
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/*--------------------------------------------------------------------------
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* hypre_SMGSetupInterpOp
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*
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* This routine uses SMGRelax to set up the interpolation operator.
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*
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* To illustrate how it proceeds, consider setting up the the {0, 0, -1}
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* stencil coefficient of P^T. This coefficient corresponds to the
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* {0, 0, 1} coefficient of P. Do one sweep of plane relaxation on the
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* fine grid points for the system, A_mask x = b, with initial guess
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* x_0 = all ones and right-hand-side b = all zeros. The A_mask matrix
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* contains all coefficients of A except for those in the same direction
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* as {0, 0, -1}.
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*
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* The relaxation data for the multigrid algorithm is passed in and used.
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* When this routine returns, the only modified relaxation parameters
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* are MaxIter, RegSpace and PreSpace info, the right-hand-side and
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* solution info.
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*--------------------------------------------------------------------------*/
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int
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hypre_SMGSetupInterpOp( void *relax_data,
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hypre_StructMatrix *A,
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hypre_StructVector *b,
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hypre_StructVector *x,
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hypre_StructMatrix *PT,
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int cdir,
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hypre_Index cindex,
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hypre_Index findex,
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hypre_Index stride )
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{
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hypre_StructMatrix *A_mask;
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hypre_StructStencil *A_stencil;
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hypre_Index *A_stencil_shape;
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int A_stencil_size;
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hypre_StructStencil *PT_stencil;
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hypre_Index *PT_stencil_shape;
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int PT_stencil_size;
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int *stencil_indices;
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int num_stencil_indices;
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hypre_StructGrid *fgrid;
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hypre_StructStencil *compute_pkg_stencil;
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hypre_Index *compute_pkg_stencil_shape;
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int compute_pkg_stencil_size = 1;
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int compute_pkg_stencil_dim = 1;
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hypre_ComputePkg *compute_pkg;
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hypre_ComputeInfo *compute_info;
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hypre_CommHandle *comm_handle;
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hypre_BoxArrayArray *compute_box_aa;
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hypre_BoxArray *compute_box_a;
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hypre_Box *compute_box;
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hypre_Box *PT_data_box;
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hypre_Box *x_data_box;
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double *PTp;
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double *xp;
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int PTi;
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int xi;
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hypre_Index loop_size;
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hypre_Index start;
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hypre_Index startc;
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hypre_Index stridec;
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int si, sj, d;
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int compute_i, i, j;
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int loopi, loopj, loopk;
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int ierr = 0;
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/*--------------------------------------------------------
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* Initialize some things
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*--------------------------------------------------------*/
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hypre_SetIndex(stridec, 1, 1, 1);
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fgrid = hypre_StructMatrixGrid(A);
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A_stencil = hypre_StructMatrixStencil(A);
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A_stencil_shape = hypre_StructStencilShape(A_stencil);
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A_stencil_size = hypre_StructStencilSize(A_stencil);
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PT_stencil = hypre_StructMatrixStencil(PT);
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PT_stencil_shape = hypre_StructStencilShape(PT_stencil);
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PT_stencil_size = hypre_StructStencilSize(PT_stencil);
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/* Set up relaxation parameters */
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hypre_SMGRelaxSetMaxIter(relax_data, 1);
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hypre_SMGRelaxSetNumPreSpaces(relax_data, 0);
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hypre_SMGRelaxSetNumRegSpaces(relax_data, 1);
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hypre_SMGRelaxSetRegSpaceRank(relax_data, 0, 1);
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compute_pkg_stencil_shape =
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hypre_CTAlloc(hypre_Index, compute_pkg_stencil_size);
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compute_pkg_stencil = hypre_StructStencilCreate(compute_pkg_stencil_dim,
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compute_pkg_stencil_size,
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compute_pkg_stencil_shape);
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for (si = 0; si < PT_stencil_size; si++)
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{
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/*-----------------------------------------------------
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* Compute A_mask matrix: This matrix contains all
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* stencil coefficients of A except for the coefficients
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* in the opposite direction of the current P stencil
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* coefficient being computed (same direction for P^T).
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*-----------------------------------------------------*/
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stencil_indices = hypre_TAlloc(int, A_stencil_size);
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num_stencil_indices = 0;
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for (sj = 0; sj < A_stencil_size; sj++)
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{
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if (hypre_IndexD(A_stencil_shape[sj], cdir) !=
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hypre_IndexD(PT_stencil_shape[si], cdir) )
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{
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stencil_indices[num_stencil_indices] = sj;
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num_stencil_indices++;
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}
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}
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A_mask =
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hypre_StructMatrixCreateMask(A, num_stencil_indices, stencil_indices);
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hypre_TFree(stencil_indices);
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/*-----------------------------------------------------
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* Do relaxation sweep to compute coefficients
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*-----------------------------------------------------*/
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hypre_StructVectorClearGhostValues(x);
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hypre_StructVectorSetConstantValues(x, 1.0);
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hypre_StructVectorSetConstantValues(b, 0.0);
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hypre_SMGRelaxSetNewMatrixStencil(relax_data, PT_stencil);
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hypre_SMGRelaxSetup(relax_data, A_mask, b, x);
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hypre_SMGRelax(relax_data, A_mask, b, x);
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/*-----------------------------------------------------
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* Free up A_mask matrix
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*-----------------------------------------------------*/
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hypre_StructMatrixDestroy(A_mask);
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/*-----------------------------------------------------
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* Set up compute package for communication of
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* coefficients from fine to coarse across processor
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* boundaries.
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*-----------------------------------------------------*/
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hypre_CopyIndex(PT_stencil_shape[si], compute_pkg_stencil_shape[0]);
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hypre_CreateComputeInfo(fgrid, compute_pkg_stencil, &compute_info);
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hypre_ComputeInfoProjectSend(compute_info, findex, stride);
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hypre_ComputeInfoProjectRecv(compute_info, findex, stride);
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hypre_ComputeInfoProjectComp(compute_info, cindex, stride);
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hypre_ComputePkgCreate(compute_info, hypre_StructVectorDataSpace(x), 1,
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fgrid, &compute_pkg);
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/*-----------------------------------------------------
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* Copy coefficients from x into P^T
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*-----------------------------------------------------*/
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for (compute_i = 0; compute_i < 2; compute_i++)
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{
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switch(compute_i)
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{
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case 0:
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{
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xp = hypre_StructVectorData(x);
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hypre_InitializeIndtComputations(compute_pkg, xp, &comm_handle);
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compute_box_aa = hypre_ComputePkgIndtBoxes(compute_pkg);
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}
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break;
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case 1:
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{
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hypre_FinalizeIndtComputations(comm_handle);
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compute_box_aa = hypre_ComputePkgDeptBoxes(compute_pkg);
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}
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break;
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}
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hypre_ForBoxArrayI(i, compute_box_aa)
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{
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compute_box_a =
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hypre_BoxArrayArrayBoxArray(compute_box_aa, i);
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x_data_box =
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hypre_BoxArrayBox(hypre_StructVectorDataSpace(x), i);
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PT_data_box =
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hypre_BoxArrayBox(hypre_StructMatrixDataSpace(PT), i);
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xp = hypre_StructVectorBoxData(x, i);
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PTp = hypre_StructMatrixBoxData(PT, i, si);
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hypre_ForBoxI(j, compute_box_a)
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{
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compute_box = hypre_BoxArrayBox(compute_box_a, j);
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hypre_CopyIndex(hypre_BoxIMin(compute_box), start);
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hypre_StructMapFineToCoarse(start, cindex, stride,
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startc);
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/* shift start index to appropriate F-point */
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for (d = 0; d < 3; d++)
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{
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hypre_IndexD(start, d) +=
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hypre_IndexD(PT_stencil_shape[si], d);
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}
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hypre_BoxGetStrideSize(compute_box, stride, loop_size);
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hypre_BoxLoop2Begin(loop_size,
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x_data_box, start, stride, xi,
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PT_data_box, startc, stridec, PTi);
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#define HYPRE_BOX_SMP_PRIVATE loopk,loopi,loopj,xi,PTi
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#include "hypre_box_smp_forloop.h"
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hypre_BoxLoop2For(loopi, loopj, loopk, xi, PTi)
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{
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PTp[PTi] = xp[xi];
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}
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hypre_BoxLoop2End(xi, PTi);
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}
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}
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}
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/*-----------------------------------------------------
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* Free up compute package info
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*-----------------------------------------------------*/
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hypre_ComputePkgDestroy(compute_pkg);
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}
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/* Tell SMGRelax that the stencil has changed */
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hypre_SMGRelaxSetNewMatrixStencil(relax_data, PT_stencil);
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hypre_StructStencilDestroy(compute_pkg_stencil);
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#if 0
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hypre_StructMatrixAssemble(PT);
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#else
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hypre_StructInterpAssemble(A, PT, 1, cdir, cindex, stride);
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#endif
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return ierr;
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}
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