void
hypre_F90_IFACE(hypre_structsmgsettol, HYPRE_STRUCTSMGSETTOL)
( hypre_F90_Obj *solver,
hypre_F90_Real *tol,
hypre_F90_Int *ierr )
{
*ierr = (hypre_F90_Int)
( HYPRE_StructSMGSetTol(
hypre_F90_PassObj (HYPRE_StructSolver, solver),
hypre_F90_PassReal (tol) ) );
}
double *solve(double *Ab, int solver_id, struct parms parms)
{
int i, j;
double final_res_norm;
int time_index, n_pre, n_post, num_iterations;
n_pre = 1; n_post = 1;
double *A_val, *b_val;
A_val = (double *) calloc(parms.N*parms.nsten, sizeof(double));
b_val = (double *) calloc(parms.N, sizeof(double));
for (i = 0; i < (parms.N*parms.nsten); i++){
A_val[i] = Ab[i];
}
for (i = 0; i < parms.N; i++){
b_val[i] = Ab[i+parms.N*parms.nsten];
}
// HYPRE //
HYPRE_StructGrid grid;
HYPRE_StructStencil stencil;
HYPRE_StructMatrix A;
HYPRE_StructVector b;
HYPRE_StructVector x;
HYPRE_StructSolver solver;
HYPRE_StructSolver precond;
#if Dim == 2
HYPRE_Int ilower[2] = {parms.x0, parms.y0};
HYPRE_Int iupper[2] = {parms.x1, parms.y1};
#endif
#if Dim == 3
HYPRE_Int ilower[3] = {parms.x0, parms.y0, 0};
HYPRE_Int iupper[3] = {parms.x1, parms.y1, parms.Nz-1};
#endif
{
// Create an empty 2D grid object
HYPRE_StructGridCreate(MPI_COMM_WORLD, Dim, &grid);
// Add a new box to the grid
HYPRE_StructGridSetExtents(grid, ilower, iupper);
// 1. Set up periodic boundary condition in y-direction and create the grid
int pset[3];
pset[0] = 0; pset[1] = parms.Ny; pset[2] = 0;
#if Dim == 3
pset[2] = parms.Nz;
#endif
//HYPRE_StructGridSetNumGhost(grid,pset)
HYPRE_StructGridSetPeriodic(grid, pset);
HYPRE_StructGridAssemble(grid);
}
// 2. Define the discretization stencil
{
if (Dim == 2){
// Create an empty 2D, 5-pt stencil object
HYPRE_StructStencilCreate(2, parms.nsten, &stencil);
// Define the geometry of the stencil
{
int offsets[5][2] = {{0,0}, {-1,0}, {0,-1}, {0,1}, {1,0}};
for (i = 0; i < parms.nsten; i++)
HYPRE_StructStencilSetElement(stencil, i, offsets[i]);
}
}
else
{
HYPRE_StructStencilCreate(3, parms.nsten, &stencil);
// Define the geometry of the 3D stencil
{
int offsets[7][3] = {{0,0,0}, {-1,0,0}, {0,-1,0}, {0,1,0}, {1,0,0}, {0,0,-1}, {0,0,1}};
for (i = 0; i < parms.nsten; i++)
HYPRE_StructStencilSetElement(stencil, i, offsets[i]);
}
}
}
// 3. Set up a Struct Matrix A from Aval
{
HYPRE_Int stencil_indices[parms.nsten];
// Create an empty matrix object
HYPRE_StructMatrixCreate(MPI_COMM_WORLD, grid, stencil, &A);
// Indicate that the matrix coefficients are ready to be set
HYPRE_StructMatrixInitialize(A);
for (j = 0; j < parms.nsten; j++)
stencil_indices[j] = j;
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, parms.nsten, stencil_indices, A_val);
free(A_val);
}
// 4. Set up Struct Vectors for b from b_val and set x = 0
{
double *values;
HYPRE_StructVectorCreate(MPI_COMM_WORLD, grid, &b);
HYPRE_StructVectorCreate(MPI_COMM_WORLD, grid, &x);
HYPRE_StructVectorInitialize(b);
HYPRE_StructVectorInitialize(x);
values = calloc((parms.N), sizeof(double));
for (i = 0; i < (parms.N); i++)
values[i] = 0.0;
HYPRE_StructVectorSetBoxValues(x, ilower, iupper, values);
HYPRE_StructVectorSetBoxValues(b, ilower, iupper, b_val);
free(b_val);
free(values);
}
//Finalize the vector and matrix assembly
HYPRE_StructMatrixAssemble(A);
HYPRE_StructVectorAssemble(b);
HYPRE_StructVectorAssemble(x);
#if DEBUG == 3
HYPRE_StructMatrixPrint("./poisson.matrix", A, 0);
HYPRE_StructVectorPrint("./poisson.rhs", b, 0);
/*char fname[64];
char Aname[64], bname[64];
sprintf(Aname,"data/A%d.",parms.cyc);
sprintf(bname,"data/b%d.",parms.cyc);
filename(fname, Aname, parms.wkdir, parms);
HYPRE_StructMatrixPrint(fname, A, 0);
filename(fname, bname, parms.wkdir, parms);
HYPRE_StructVectorPrint(fname, b, 0);*/
#endif
// 6. Set up and use a solver (SMG)
if (solver_id == 0)
{
time_index = hypre_InitializeTiming("SMG Setup");
hypre_BeginTiming(time_index);
HYPRE_StructSMGCreate(MPI_COMM_WORLD, &solver);
HYPRE_StructSMGSetMemoryUse(solver, 0);
HYPRE_StructSMGSetMaxIter(solver, 100);
HYPRE_StructSMGSetTol(solver, 1.0e-12);
HYPRE_StructSMGSetRelChange(solver, 0);
HYPRE_StructSMGSetNumPreRelax(solver, n_pre);
HYPRE_StructSMGSetNumPostRelax(solver, n_post);
// Logging must be on to get iterations and residual norm info below
HYPRE_StructSMGSetLogging(solver, 1);
// Setup and print setup timings
HYPRE_StructSMGSetup(solver, A, b, x);
hypre_EndTiming(time_index);
#if DEBUG == 3
hypre_PrintTiming("Setup phase times", MPI_COMM_WORLD);
#endif
hypre_FinalizeTiming(time_index);
hypre_ClearTiming();
// Solve and print solve timings
time_index = hypre_InitializeTiming("SMG Solve");
hypre_BeginTiming(time_index);
HYPRE_StructSMGSolve(solver, A, b, x);
hypre_EndTiming(time_index);
#if DEBUG == 3
hypre_PrintTiming("Solve phase times", MPI_COMM_WORLD);
#endif
hypre_FinalizeTiming(time_index);
hypre_ClearTiming();
// Get some info on the run
HYPRE_StructSMGGetNumIterations(solver, &num_iterations);
HYPRE_StructSMGGetFinalRelativeResidualNorm(solver, &final_res_norm);
#if DEBUG == 2
if (parms.rank == 0){
fprintf(stdout, "Number of Iterations = %4d ; Final Relative Residual Norm = %e\n\n", num_iterations, final_res_norm);
}
#endif
// Clean up
HYPRE_StructSMGDestroy(solver);
}
// 6. Set up and use a solver (PCG) with SMG Preconditioner
if (solver_id == 1)
{
HYPRE_StructPCGCreate(MPI_COMM_WORLD, &solver);
//HYPRE_StructPCGSetMemoryUse(solver, 0);
HYPRE_StructPCGSetMaxIter(solver, 100);
HYPRE_StructPCGSetTol(solver, 1.0e-12);
HYPRE_StructPCGSetTwoNorm(solver, 1);
HYPRE_StructPCGSetRelChange(solver, 0);
//HYPRE_StructPCGSetPrintLevel(solver, 2 ); /* print each CG iteration */
HYPRE_StructPCGSetLogging(solver, 1);
/* Use symmetric SMG as preconditioner */
HYPRE_StructSMGCreate(MPI_COMM_WORLD, &precond);
HYPRE_StructSMGSetMemoryUse(precond, 0);
HYPRE_StructSMGSetMaxIter(precond, 32);
HYPRE_StructSMGSetTol(precond, 0.0);
HYPRE_StructSMGSetZeroGuess(precond);
HYPRE_StructSMGSetNumPreRelax(precond, 1);
HYPRE_StructSMGSetNumPostRelax(precond, 1);
/* Set the preconditioner and solve */
HYPRE_StructPCGSetPrecond(solver, HYPRE_StructSMGSolve, HYPRE_StructSMGSetup, precond);
HYPRE_StructPCGSetup(solver, A, b, x);
HYPRE_StructPCGSolve(solver, A, b, x);
/* Get some info on the run */
HYPRE_StructPCGGetNumIterations(solver, &num_iterations);
HYPRE_StructPCGGetFinalRelativeResidualNorm(solver, &final_res_norm);
#if DEBUG == 2
if (parms.rank == 0){
fprintf(stdout, "Number of Iterations = %4d ; Final Relative Residual Norm = %e\n\n", num_iterations, final_res_norm);
}
#endif
/* Clean up */
HYPRE_StructSMGDestroy(precond);
HYPRE_StructPCGDestroy(solver);
}
// get the local solution
double *values = calloc(parms.N, sizeof(double));
HYPRE_StructVectorGetBoxValues(x, ilower, iupper, values);
// Free memory
HYPRE_StructGridDestroy(grid);
HYPRE_StructStencilDestroy(stencil);
HYPRE_StructMatrixDestroy(A);
HYPRE_StructVectorDestroy(b);
HYPRE_StructVectorDestroy(x);
free(Ab);
return(values);
}
bool
CCDivGradHypreLevelSolver::solveSystem(
const int x_idx,
const int b_idx,
const IntVector<NDIM>& chkbrd_mode_id)
{
Pointer<PatchLevel<NDIM> > level = d_hierarchy->getPatchLevel(d_level_num);
// Copy solution and right-hand-side data to hypre structures.
for (PatchLevel<NDIM>::Iterator p(level); p; p++)
{
Pointer<Patch<NDIM> > patch = level->getPatch(p());
const Box<NDIM>& patch_box = patch->getBox();
Pointer<CellData<NDIM,double> > x_data = patch->getPatchData(x_idx);
copyToHypre(d_sol_vec, x_data, patch_box, chkbrd_mode_id);
Pointer<CellData<NDIM,double> > b_data = patch->getPatchData(b_idx);
copyToHypre(d_rhs_vec, b_data, patch_box, chkbrd_mode_id);
}
// Assemble the hypre vectors.
HYPRE_StructVectorAssemble(d_sol_vec);
HYPRE_StructVectorAssemble(d_rhs_vec);
// Solve the system.
IBTK_TIMER_START(t_solve_system_hypre);
if (d_solver_type == "PFMG")
{
HYPRE_StructPFMGSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructPFMGSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructPFMGSolve(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
HYPRE_StructPFMGGetNumIterations(d_solver, &d_current_its);
HYPRE_StructPFMGGetFinalRelativeResidualNorm(d_solver, &d_current_residual_norm);
}
else if (d_solver_type == "SMG")
{
HYPRE_StructSMGSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructSMGSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructSMGSolve(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
HYPRE_StructSMGGetNumIterations(d_solver, &d_current_its);
HYPRE_StructSMGGetFinalRelativeResidualNorm(d_solver, &d_current_residual_norm);
}
else if (d_solver_type == "PCG")
{
HYPRE_StructPCGSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructPCGSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructPCGSetAbsoluteTol(d_solver, d_abs_residual_tol);
HYPRE_StructPCGSolve(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
HYPRE_StructPCGGetNumIterations(d_solver, &d_current_its);
HYPRE_StructPCGGetFinalRelativeResidualNorm(d_solver, &d_current_residual_norm);
}
else if (d_solver_type == "GMRES")
{
HYPRE_StructGMRESSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructGMRESSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructGMRESSetAbsoluteTol(d_solver, d_abs_residual_tol);
HYPRE_StructGMRESSolve(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
HYPRE_StructGMRESGetNumIterations(d_solver, &d_current_its);
HYPRE_StructGMRESGetFinalRelativeResidualNorm(d_solver, &d_current_residual_norm);
}
else if (d_solver_type == "FlexGMRES")
{
HYPRE_StructFlexGMRESSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructFlexGMRESSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructFlexGMRESSetAbsoluteTol(d_solver, d_abs_residual_tol);
HYPRE_StructFlexGMRESSolve(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
HYPRE_StructFlexGMRESGetNumIterations(d_solver, &d_current_its);
HYPRE_StructFlexGMRESGetFinalRelativeResidualNorm(d_solver, &d_current_residual_norm);
}
else if (d_solver_type == "LGMRES")
{
HYPRE_StructLGMRESSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructLGMRESSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructLGMRESSetAbsoluteTol(d_solver, d_abs_residual_tol);
HYPRE_StructLGMRESSolve(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
HYPRE_StructLGMRESGetNumIterations(d_solver, &d_current_its);
HYPRE_StructLGMRESGetFinalRelativeResidualNorm(d_solver, &d_current_residual_norm);
}
else if (d_solver_type == "BiCGSTAB")
{
HYPRE_StructBiCGSTABSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructBiCGSTABSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructBiCGSTABSetAbsoluteTol(d_solver, d_abs_residual_tol);
HYPRE_StructBiCGSTABSolve(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
HYPRE_StructBiCGSTABGetNumIterations(d_solver, &d_current_its);
HYPRE_StructBiCGSTABGetFinalRelativeResidualNorm(d_solver, &d_current_residual_norm);
}
IBTK_TIMER_STOP(t_solve_system_hypre);
// Pull the solution vector out of the hypre structures.
for (PatchLevel<NDIM>::Iterator p(level); p; p++)
{
Pointer<Patch<NDIM> > patch = level->getPatch(p());
const Box<NDIM>& patch_box = patch->getBox();
Pointer<CellData<NDIM,double> > x_data = patch->getPatchData(x_idx);
copyFromHypre(x_data, d_sol_vec, patch_box, chkbrd_mode_id);
}
return (d_current_residual_norm <= d_rel_residual_tol || d_current_residual_norm <= d_abs_residual_tol);
}// solveSystem
void
CCDivGradHypreLevelSolver::setupHypreSolver()
{
// Get the MPI communicator.
#ifdef HAVE_MPI
MPI_Comm communicator = SAMRAI_MPI::getCommunicator();
#else
MPI_Comm communicator;
#endif
// When using a Krylov method, setup the preconditioner.
if (d_solver_type == "PCG" || d_solver_type == "GMRES" || d_solver_type == "FlexGMRES" || d_solver_type == "LGMRES" || d_solver_type == "BiCGSTAB")
{
if (d_precond_type == "PFMG")
{
HYPRE_StructPFMGCreate(communicator, &d_precond);
HYPRE_StructPFMGSetMaxIter(d_precond, 1);
HYPRE_StructPFMGSetTol(d_precond, 0.0);
HYPRE_StructPFMGSetZeroGuess(d_precond);
HYPRE_StructPFMGSetRAPType(d_precond, d_rap_type);
HYPRE_StructPFMGSetRelaxType(d_precond, d_relax_type);
HYPRE_StructPFMGSetNumPreRelax(d_precond, d_num_pre_relax_steps);
HYPRE_StructPFMGSetNumPostRelax(d_precond, d_num_post_relax_steps);
HYPRE_StructPFMGSetSkipRelax(d_precond, d_skip_relax);
}
else if (d_precond_type == "SMG")
{
HYPRE_StructSMGCreate(communicator, &d_precond);
HYPRE_StructSMGSetMaxIter(d_precond, 1);
HYPRE_StructSMGSetTol(d_precond, 0.0);
HYPRE_StructSMGSetZeroGuess(d_precond);
HYPRE_StructSMGSetMemoryUse(d_precond, d_memory_use);
HYPRE_StructSMGSetNumPreRelax(d_precond, d_num_pre_relax_steps);
HYPRE_StructSMGSetNumPostRelax(d_precond, d_num_post_relax_steps);
}
else if (d_precond_type == "Jacobi")
{
HYPRE_StructJacobiCreate(communicator, &d_precond);
HYPRE_StructJacobiSetMaxIter(d_precond, 2);
HYPRE_StructJacobiSetTol(d_precond, 0.0);
HYPRE_StructJacobiSetZeroGuess(d_precond);
}
}
// Setup the solver.
if (d_solver_type == "PFMG")
{
HYPRE_StructPFMGCreate(communicator, &d_solver);
HYPRE_StructPFMGSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructPFMGSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructPFMGSetRelChange(d_solver, d_rel_change);
HYPRE_StructPFMGSetRAPType(d_solver, d_rap_type);
HYPRE_StructPFMGSetRelaxType(d_solver, d_relax_type);
HYPRE_StructPFMGSetNumPreRelax(d_solver, d_num_pre_relax_steps);
HYPRE_StructPFMGSetNumPostRelax(d_solver, d_num_post_relax_steps);
HYPRE_StructPFMGSetSkipRelax(d_solver, d_skip_relax);
if (d_initial_guess_nonzero)
{
HYPRE_StructPFMGSetNonZeroGuess(d_solver);
}
else
{
HYPRE_StructPFMGSetZeroGuess(d_solver);
}
HYPRE_StructPFMGSetup(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
}
else if (d_solver_type == "SMG")
{
HYPRE_StructSMGCreate(communicator, &d_solver);
HYPRE_StructSMGSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructSMGSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructSMGSetRelChange(d_solver, d_rel_change);
HYPRE_StructSMGSetMemoryUse(d_solver, d_memory_use);
HYPRE_StructSMGSetNumPreRelax(d_solver, d_num_pre_relax_steps);
HYPRE_StructSMGSetNumPostRelax(d_solver, d_num_post_relax_steps);
if (d_initial_guess_nonzero)
{
HYPRE_StructSMGSetNonZeroGuess(d_solver);
}
else
{
HYPRE_StructSMGSetZeroGuess(d_solver);
}
HYPRE_StructSMGSetup(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
}
else if (d_solver_type == "PCG")
{
HYPRE_StructPCGCreate(communicator, &d_solver);
HYPRE_StructPCGSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructPCGSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructPCGSetAbsoluteTol(d_solver, d_abs_residual_tol);
HYPRE_StructPCGSetTwoNorm(d_solver, d_two_norm);
HYPRE_StructPCGSetRelChange(d_solver, d_rel_change);
if (d_precond_type == "PFMG")
{
HYPRE_StructPCGSetPrecond(d_solver,
HYPRE_StructPFMGSolve,
HYPRE_StructPFMGSetup,
d_precond);
}
else if (d_precond_type == "SMG")
{
HYPRE_StructPCGSetPrecond(d_solver,
HYPRE_StructSMGSolve,
HYPRE_StructSMGSetup,
d_precond);
}
else if (d_precond_type == "Jacobi")
{
HYPRE_StructPCGSetPrecond(d_solver,
HYPRE_StructJacobiSolve,
HYPRE_StructJacobiSetup,
d_precond);
}
else if (d_precond_type == "diagonal_scaling")
{
d_precond = NULL;
HYPRE_StructPCGSetPrecond(d_solver,
HYPRE_StructDiagScale,
HYPRE_StructDiagScaleSetup,
d_precond);
}
else if (d_precond_type == "none")
{
d_precond = NULL;
}
else
{
TBOX_ERROR(d_object_name << "::initializeSolverState()\n"
<< " unknown preconditioner type: " << d_precond_type << std::endl);
}
HYPRE_StructPCGSetup(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
}
else if (d_solver_type == "GMRES")
{
HYPRE_StructGMRESCreate(communicator, &d_solver);
HYPRE_StructGMRESSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructGMRESSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructGMRESSetAbsoluteTol(d_solver, d_abs_residual_tol);
if (d_precond_type == "PFMG")
{
HYPRE_StructGMRESSetPrecond(d_solver,
HYPRE_StructPFMGSolve,
HYPRE_StructPFMGSetup,
d_precond);
}
else if (d_precond_type == "SMG")
{
HYPRE_StructGMRESSetPrecond(d_solver,
HYPRE_StructSMGSolve,
HYPRE_StructSMGSetup,
d_precond);
}
else if (d_precond_type == "Jacobi")
{
HYPRE_StructGMRESSetPrecond(d_solver,
HYPRE_StructJacobiSolve,
HYPRE_StructJacobiSetup,
d_precond);
}
else if (d_precond_type == "diagonal_scaling")
{
d_precond = NULL;
HYPRE_StructGMRESSetPrecond(d_solver,
HYPRE_StructDiagScale,
HYPRE_StructDiagScaleSetup,
d_precond);
}
else if (d_precond_type == "none")
{
d_precond = NULL;
}
else
{
TBOX_ERROR(d_object_name << "::initializeSolverState()\n"
<< " unknown preconditioner type: " << d_precond_type << std::endl);
}
HYPRE_StructGMRESSetup(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
}
else if (d_solver_type == "FlexGMRES")
{
HYPRE_StructFlexGMRESCreate(communicator, &d_solver);
HYPRE_StructFlexGMRESSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructFlexGMRESSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructFlexGMRESSetAbsoluteTol(d_solver, d_abs_residual_tol);
if (d_precond_type == "PFMG")
{
HYPRE_StructFlexGMRESSetPrecond(d_solver,
HYPRE_StructPFMGSolve,
HYPRE_StructPFMGSetup,
d_precond);
}
else if (d_precond_type == "SMG")
{
HYPRE_StructFlexGMRESSetPrecond(d_solver,
HYPRE_StructSMGSolve,
HYPRE_StructSMGSetup,
d_precond);
}
else if (d_precond_type == "Jacobi")
{
HYPRE_StructFlexGMRESSetPrecond(d_solver,
HYPRE_StructJacobiSolve,
HYPRE_StructJacobiSetup,
d_precond);
}
else if (d_precond_type == "diagonal_scaling")
{
d_precond = NULL;
HYPRE_StructFlexGMRESSetPrecond(d_solver,
HYPRE_StructDiagScale,
HYPRE_StructDiagScaleSetup,
d_precond);
}
else if (d_precond_type == "none")
{
d_precond = NULL;
}
else
{
TBOX_ERROR(d_object_name << "::initializeSolverState()\n"
<< " unknown preconditioner type: " << d_precond_type << std::endl);
}
HYPRE_StructFlexGMRESSetup(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
}
else if (d_solver_type == "LGMRES")
{
HYPRE_StructLGMRESCreate(communicator, &d_solver);
HYPRE_StructLGMRESSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructLGMRESSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructLGMRESSetAbsoluteTol(d_solver, d_abs_residual_tol);
if (d_precond_type == "PFMG")
{
HYPRE_StructLGMRESSetPrecond(d_solver,
HYPRE_StructPFMGSolve,
HYPRE_StructPFMGSetup,
d_precond);
}
else if (d_precond_type == "SMG")
{
HYPRE_StructLGMRESSetPrecond(d_solver,
HYPRE_StructSMGSolve,
HYPRE_StructSMGSetup,
d_precond);
}
else if (d_precond_type == "Jacobi")
{
HYPRE_StructLGMRESSetPrecond(d_solver,
HYPRE_StructJacobiSolve,
HYPRE_StructJacobiSetup,
d_precond);
}
else if (d_precond_type == "diagonal_scaling")
{
d_precond = NULL;
HYPRE_StructLGMRESSetPrecond(d_solver,
HYPRE_StructDiagScale,
HYPRE_StructDiagScaleSetup,
d_precond);
}
else if (d_precond_type == "none")
{
d_precond = NULL;
}
else
{
TBOX_ERROR(d_object_name << "::initializeSolverState()\n"
<< " unknown preconditioner type: " << d_precond_type << std::endl);
}
HYPRE_StructLGMRESSetup(d_solver, d_matrix, d_rhs_vec, d_sol_vec);
}
else if (d_solver_type == "BiCGSTAB")
{
HYPRE_StructBiCGSTABCreate(communicator, &d_solver);
HYPRE_StructBiCGSTABSetMaxIter(d_solver, d_max_iterations);
HYPRE_StructBiCGSTABSetTol(d_solver, d_rel_residual_tol);
HYPRE_StructBiCGSTABSetAbsoluteTol(d_solver, d_abs_residual_tol);
if (d_precond_type == "PFMG")
{
HYPRE_StructBiCGSTABSetPrecond(d_solver,
HYPRE_StructPFMGSolve,
HYPRE_StructPFMGSetup,
d_precond);
}
else if (d_precond_type == "SMG")
{
HYPRE_StructBiCGSTABSetPrecond(d_solver,
HYPRE_StructSMGSolve,
HYPRE_StructSMGSetup,
d_precond);
}
else if (d_precond_type == "Jacobi")
{
HYPRE_StructBiCGSTABSetPrecond(d_solver,
HYPRE_StructJacobiSolve,
HYPRE_StructJacobiSetup,
d_precond);
}
else if (d_precond_type == "diagonal_scaling")
{
d_precond = NULL;
HYPRE_StructBiCGSTABSetPrecond(d_solver,
HYPRE_StructDiagScale,
HYPRE_StructDiagScaleSetup,
d_precond);
}
else if (d_precond_type == "none")
{
d_precond = NULL;
}
else
{
TBOX_ERROR(d_object_name << "::initializeSolverState()\n"
<< " unknown preconditioner type: " << d_precond_type << std::endl);
}
HYPRE_StructBiCGSTABSetup(d_solver,d_matrix, d_rhs_vec, d_sol_vec);
}
else
{
TBOX_ERROR(d_object_name << "::initializeSolverState()\n"
<< " unknown solver type: " << d_solver_type << std::endl);
}
return;
}// setupHypreSolver
HYPRE_Int
HYPRE_SStructSplitSetup( HYPRE_SStructSolver solver,
HYPRE_SStructMatrix A,
HYPRE_SStructVector b,
HYPRE_SStructVector x )
{
hypre_SStructVector *y;
HYPRE_Int nparts;
HYPRE_Int *nvars;
void ****smatvec_data;
HYPRE_Int (***ssolver_solve)();
HYPRE_Int (***ssolver_destroy)();
void ***ssolver_data;
HYPRE_Int ssolver = (solver -> ssolver);
MPI_Comm comm;
hypre_SStructGrid *grid;
hypre_SStructPMatrix *pA;
hypre_SStructPVector *px;
hypre_SStructPVector *py;
hypre_StructMatrix *sA;
hypre_StructVector *sx;
hypre_StructVector *sy;
HYPRE_StructMatrix sAH;
HYPRE_StructVector sxH;
HYPRE_StructVector syH;
HYPRE_Int (*ssolve)();
HYPRE_Int (*sdestroy)();
void *sdata;
HYPRE_Int part, vi, vj;
comm = hypre_SStructVectorComm(b);
grid = hypre_SStructVectorGrid(b);
HYPRE_SStructVectorCreate(comm, grid, &y);
HYPRE_SStructVectorInitialize(y);
HYPRE_SStructVectorAssemble(y);
nparts = hypre_SStructMatrixNParts(A);
nvars = hypre_TAlloc(HYPRE_Int, nparts);
smatvec_data = hypre_TAlloc(void ***, nparts);
ssolver_solve = (HYPRE_Int (***)()) hypre_MAlloc((sizeof(HYPRE_Int (**)()) * nparts));
ssolver_destroy = (HYPRE_Int (***)()) hypre_MAlloc((sizeof(HYPRE_Int (**)()) * nparts));
ssolver_data = hypre_TAlloc(void **, nparts);
for (part = 0; part < nparts; part++)
{
pA = hypre_SStructMatrixPMatrix(A, part);
px = hypre_SStructVectorPVector(x, part);
py = hypre_SStructVectorPVector(y, part);
nvars[part] = hypre_SStructPMatrixNVars(pA);
smatvec_data[part] = hypre_TAlloc(void **, nvars[part]);
ssolver_solve[part] =
(HYPRE_Int (**)()) hypre_MAlloc((sizeof(HYPRE_Int (*)()) * nvars[part]));
ssolver_destroy[part] =
(HYPRE_Int (**)()) hypre_MAlloc((sizeof(HYPRE_Int (*)()) * nvars[part]));
ssolver_data[part] = hypre_TAlloc(void *, nvars[part]);
for (vi = 0; vi < nvars[part]; vi++)
{
smatvec_data[part][vi] = hypre_TAlloc(void *, nvars[part]);
for (vj = 0; vj < nvars[part]; vj++)
{
sA = hypre_SStructPMatrixSMatrix(pA, vi, vj);
sx = hypre_SStructPVectorSVector(px, vj);
smatvec_data[part][vi][vj] = NULL;
if (sA != NULL)
{
smatvec_data[part][vi][vj] = hypre_StructMatvecCreate();
hypre_StructMatvecSetup(smatvec_data[part][vi][vj], sA, sx);
}
}
sA = hypre_SStructPMatrixSMatrix(pA, vi, vi);
sx = hypre_SStructPVectorSVector(px, vi);
sy = hypre_SStructPVectorSVector(py, vi);
sAH = (HYPRE_StructMatrix) sA;
sxH = (HYPRE_StructVector) sx;
syH = (HYPRE_StructVector) sy;
switch(ssolver)
{
default:
/* If no solver is matched, use Jacobi, but throw and error */
if (ssolver != HYPRE_Jacobi)
{
hypre_error(HYPRE_ERROR_GENERIC);
} /* don't break */
case HYPRE_Jacobi:
HYPRE_StructJacobiCreate(comm, (HYPRE_StructSolver *)&sdata);
HYPRE_StructJacobiSetMaxIter(sdata, 1);
HYPRE_StructJacobiSetTol(sdata, 0.0);
if (solver -> zero_guess)
{
HYPRE_StructJacobiSetZeroGuess(sdata);
}
HYPRE_StructJacobiSetup(sdata, sAH, syH, sxH);
ssolve = HYPRE_StructJacobiSolve;
sdestroy = HYPRE_StructJacobiDestroy;
break;
case HYPRE_SMG:
HYPRE_StructSMGCreate(comm, (HYPRE_StructSolver *)&sdata);
HYPRE_StructSMGSetMemoryUse(sdata, 0);
HYPRE_StructSMGSetMaxIter(sdata, 1);
HYPRE_StructSMGSetTol(sdata, 0.0);
if (solver -> zero_guess)
{
HYPRE_StructSMGSetZeroGuess(sdata);
}
HYPRE_StructSMGSetNumPreRelax(sdata, 1);
HYPRE_StructSMGSetNumPostRelax(sdata, 1);
HYPRE_StructSMGSetLogging(sdata, 0);
HYPRE_StructSMGSetPrintLevel(sdata, 0);
HYPRE_StructSMGSetup(sdata, sAH, syH, sxH);
ssolve = HYPRE_StructSMGSolve;
sdestroy = HYPRE_StructSMGDestroy;
break;
case HYPRE_PFMG:
HYPRE_StructPFMGCreate(comm, (HYPRE_StructSolver *)&sdata);
HYPRE_StructPFMGSetMaxIter(sdata, 1);
HYPRE_StructPFMGSetTol(sdata, 0.0);
if (solver -> zero_guess)
{
HYPRE_StructPFMGSetZeroGuess(sdata);
}
HYPRE_StructPFMGSetRelaxType(sdata, 1);
HYPRE_StructPFMGSetNumPreRelax(sdata, 1);
HYPRE_StructPFMGSetNumPostRelax(sdata, 1);
HYPRE_StructPFMGSetLogging(sdata, 0);
HYPRE_StructPFMGSetPrintLevel(sdata, 0);
HYPRE_StructPFMGSetup(sdata, sAH, syH, sxH);
ssolve = HYPRE_StructPFMGSolve;
sdestroy = HYPRE_StructPFMGDestroy;
break;
}
ssolver_solve[part][vi] = ssolve;
ssolver_destroy[part][vi] = sdestroy;
ssolver_data[part][vi] = sdata;
}
}
(solver -> y) = y;
(solver -> nparts) = nparts;
(solver -> nvars) = nvars;
(solver -> smatvec_data) = smatvec_data;
(solver -> ssolver_solve) = ssolver_solve;
(solver -> ssolver_destroy) = ssolver_destroy;
(solver -> ssolver_data) = ssolver_data;
if ((solver -> tol) > 0.0)
{
hypre_SStructMatvecCreate(&(solver -> matvec_data));
hypre_SStructMatvecSetup((solver -> matvec_data), A, x);
}
return hypre_error_flag;
}
int main (int argc, char *argv[])
{
int myid, num_procs;
HYPRE_SStructGrid grid;
HYPRE_SStructGraph graph;
HYPRE_SStructStencil stencil;
HYPRE_SStructMatrix A;
HYPRE_SStructVector b;
HYPRE_SStructVector x;
/* We are using struct solvers for this example */
HYPRE_StructSolver solver;
HYPRE_StructSolver precond;
int object_type;
/* Initialize MPI */
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &myid);
MPI_Comm_size(MPI_COMM_WORLD, &num_procs);
if (num_procs != 2)
{
if (myid ==0) printf("Must run with 2 processors!\n");
MPI_Finalize();
return(0);
}
/* 1. Set up the 2D grid. This gives the index space in each part.
Here we only use one part and one variable. (So the part id is 0
and the variable id is 0) */
{
int ndim = 2;
int nparts = 1;
int part = 0;
/* Create an empty 2D grid object */
HYPRE_SStructGridCreate(MPI_COMM_WORLD, ndim, nparts, &grid);
/* Set the extents of the grid - each processor sets its grid
boxes. Each part has its own relative index space numbering,
but in this example all boxes belong to the same part. */
/* Processor 0 owns two boxes in the grid. */
if (myid == 0)
{
/* Add a new box to the grid */
{
int ilower[2] = {-3, 1};
int iupper[2] = {-1, 2};
HYPRE_SStructGridSetExtents(grid, part, ilower, iupper);
}
/* Add a new box to the grid */
{
int ilower[2] = {0, 1};
int iupper[2] = {2, 4};
HYPRE_SStructGridSetExtents(grid, part, ilower, iupper);
}
}
/* Processor 1 owns one box in the grid. */
else if (myid == 1)
{
/* Add a new box to the grid */
{
int ilower[2] = {3, 1};
int iupper[2] = {6, 4};
HYPRE_SStructGridSetExtents(grid, part, ilower, iupper);
}
}
/* Set the variable type and number of variables on each part. */
{
int i;
int nvars = 1;
HYPRE_SStructVariable vartypes[1] = {HYPRE_SSTRUCT_VARIABLE_CELL};
for (i = 0; i< nparts; i++)
HYPRE_SStructGridSetVariables(grid, i, nvars, vartypes);
}
/* Now the grid is ready to use */
HYPRE_SStructGridAssemble(grid);
}
/* 2. Define the discretization stencil(s) */
{
/* Create an empty 2D, 5-pt stencil object */
HYPRE_SStructStencilCreate(2, 5, &stencil);
/* Define the geometry of the stencil. Each represents a
relative offset (in the index space). */
{
int entry;
int offsets[5][2] = {{0,0}, {-1,0}, {1,0}, {0,-1}, {0,1}};
int var = 0;
/* Assign numerical values to the offsets so that we can
easily refer to them - the last argument indicates the
variable for which we are assigning this stencil - we are
just using one variable in this example so it is the first one (0) */
for (entry = 0; entry < 5; entry++)
HYPRE_SStructStencilSetEntry(stencil, entry, offsets[entry], var);
}
}
/* 3. Set up the Graph - this determines the non-zero structure
of the matrix and allows non-stencil relationships between the parts */
{
int var = 0;
int part = 0;
/* Create the graph object */
HYPRE_SStructGraphCreate(MPI_COMM_WORLD, grid, &graph);
/* See MatrixSetObjectType below */
object_type = HYPRE_STRUCT;
HYPRE_SStructGraphSetObjectType(graph, object_type);
/* Now we need to tell the graph which stencil to use for each
variable on each part (we only have one variable and one part) */
HYPRE_SStructGraphSetStencil(graph, part, var, stencil);
/* Here we could establish connections between parts if we
had more than one part using the graph. For example, we could
use HYPRE_GraphAddEntries() routine or HYPRE_GridSetNeighborBox() */
/* Assemble the graph */
HYPRE_SStructGraphAssemble(graph);
}
/* 4. Set up a SStruct Matrix */
{
int i,j;
int part = 0;
int var = 0;
/* Create the empty matrix object */
HYPRE_SStructMatrixCreate(MPI_COMM_WORLD, graph, &A);
/* Set the object type (by default HYPRE_SSTRUCT). This determines the
data structure used to store the matrix. If you want to use unstructured
solvers, e.g. BoomerAMG, the object type should be HYPRE_PARCSR.
If the problem is purely structured (with one part), you may want to use
HYPRE_STRUCT to access the structured solvers. Here we have a purely
structured example. */
object_type = HYPRE_STRUCT;
HYPRE_SStructMatrixSetObjectType(A, object_type);
/* Get ready to set values */
HYPRE_SStructMatrixInitialize(A);
/* Each processor must set the stencil values for their boxes on each part.
In this example, we only set stencil entries and therefore use
HYPRE_SStructMatrixSetBoxValues. If we need to set non-stencil entries,
we have to use HYPRE_SStructMatrixSetValues (shown in a later example). */
if (myid == 0)
{
/* Set the matrix coefficients for some set of stencil entries
over all the gridpoints in my first box (account for boundary
grid points later) */
{
int ilower[2] = {-3, 1};
int iupper[2] = {-1, 2};
int nentries = 5;
int nvalues = 30; /* 6 grid points, each with 5 stencil entries */
double values[30];
int stencil_indices[5];
for (j = 0; j < nentries; j++) /* label the stencil indices -
these correspond to the offsets
defined above */
stencil_indices[j] = j;
for (i = 0; i < nvalues; i += nentries)
{
values[i] = 4.0;
for (j = 1; j < nentries; j++)
values[i+j] = -1.0;
}
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, nentries,
stencil_indices, values);
}
/* Set the matrix coefficients for some set of stencil entries
over the gridpoints in my second box */
{
int ilower[2] = {0, 1};
int iupper[2] = {2, 4};
int nentries = 5;
int nvalues = 60; /* 12 grid points, each with 5 stencil entries */
double values[60];
int stencil_indices[5];
for (j = 0; j < nentries; j++)
stencil_indices[j] = j;
for (i = 0; i < nvalues; i += nentries)
{
values[i] = 4.0;
for (j = 1; j < nentries; j++)
values[i+j] = -1.0;
}
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, nentries,
stencil_indices, values);
}
}
else if (myid == 1)
{
/* Set the matrix coefficients for some set of stencil entries
over the gridpoints in my box */
{
int ilower[2] = {3, 1};
int iupper[2] = {6, 4};
int nentries = 5;
int nvalues = 80; /* 16 grid points, each with 5 stencil entries */
double values[80];
int stencil_indices[5];
for (j = 0; j < nentries; j++)
stencil_indices[j] = j;
for (i = 0; i < nvalues; i += nentries)
{
values[i] = 4.0;
for (j = 1; j < nentries; j++)
values[i+j] = -1.0;
}
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, nentries,
stencil_indices, values);
}
}
/* For each box, set any coefficients that reach ouside of the
boundary to 0 */
if (myid == 0)
{
int maxnvalues = 6;
double values[6];
for (i = 0; i < maxnvalues; i++)
values[i] = 0.0;
{
/* Values below our first AND second box */
int ilower[2] = {-3, 1};
int iupper[2] = { 2, 1};
int stencil_indices[1] = {3};
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, 1,
stencil_indices, values);
}
{
/* Values to the left of our first box */
int ilower[2] = {-3, 1};
int iupper[2] = {-3, 2};
int stencil_indices[1] = {1};
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, 1,
stencil_indices, values);
}
{
/* Values above our first box */
int ilower[2] = {-3, 2};
int iupper[2] = {-1, 2};
int stencil_indices[1] = {4};
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, 1,
stencil_indices, values);
}
{
/* Values to the left of our second box (that do not border the
first box). */
int ilower[2] = { 0, 3};
int iupper[2] = { 0, 4};
int stencil_indices[1] = {1};
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, 1,
stencil_indices, values);
}
{
/* Values above our second box */
int ilower[2] = { 0, 4};
int iupper[2] = { 2, 4};
int stencil_indices[1] = {4};
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, 1,
stencil_indices, values);
}
}
else if (myid == 1)
{
int maxnvalues = 4;
double values[4];
for (i = 0; i < maxnvalues; i++)
values[i] = 0.0;
{
/* Values below our box */
int ilower[2] = { 3, 1};
int iupper[2] = { 6, 1};
int stencil_indices[1] = {3};
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, 1,
stencil_indices, values);
}
{
/* Values to the right of our box */
int ilower[2] = { 6, 1};
int iupper[2] = { 6, 4};
int stencil_indices[1] = {2};
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, 1,
stencil_indices, values);
}
{
/* Values above our box */
int ilower[2] = { 3, 4};
int iupper[2] = { 6, 4};
int stencil_indices[1] = {4};
HYPRE_SStructMatrixSetBoxValues(A, part, ilower, iupper,
var, 1,
stencil_indices, values);
}
}
/* This is a collective call finalizing the matrix assembly.
The matrix is now ``ready to be used'' */
HYPRE_SStructMatrixAssemble(A);
}
/* 5. Set up SStruct Vectors for b and x */
{
int i;
/* We have one part and one variable. */
int part = 0;
int var = 0;
/* Create an empty vector object */
HYPRE_SStructVectorCreate(MPI_COMM_WORLD, grid, &b);
HYPRE_SStructVectorCreate(MPI_COMM_WORLD, grid, &x);
/* As with the matrix, set the object type for the vectors
to be the struct type */
object_type = HYPRE_STRUCT;
HYPRE_SStructVectorSetObjectType(b, object_type);
HYPRE_SStructVectorSetObjectType(x, object_type);
/* Indicate that the vector coefficients are ready to be set */
HYPRE_SStructVectorInitialize(b);
HYPRE_SStructVectorInitialize(x);
if (myid == 0)
{
/* Set the vector coefficients over the gridpoints in my first box */
{
int ilower[2] = {-3, 1};
int iupper[2] = {-1, 2};
int nvalues = 6; /* 6 grid points */
double values[6];
for (i = 0; i < nvalues; i ++)
values[i] = 1.0;
HYPRE_SStructVectorSetBoxValues(b, part, ilower, iupper, var, values);
for (i = 0; i < nvalues; i ++)
values[i] = 0.0;
HYPRE_SStructVectorSetBoxValues(x, part, ilower, iupper, var, values);
}
/* Set the vector coefficients over the gridpoints in my second box */
{
int ilower[2] = { 0, 1};
int iupper[2] = { 2, 4};
int nvalues = 12; /* 12 grid points */
double values[12];
for (i = 0; i < nvalues; i ++)
values[i] = 1.0;
HYPRE_SStructVectorSetBoxValues(b, part, ilower, iupper, var, values);
for (i = 0; i < nvalues; i ++)
values[i] = 0.0;
HYPRE_SStructVectorSetBoxValues(x, part, ilower, iupper, var, values);
}
}
else if (myid == 1)
{
/* Set the vector coefficients over the gridpoints in my box */
{
int ilower[2] = { 3, 1};
int iupper[2] = { 6, 4};
int nvalues = 16; /* 16 grid points */
double values[16];
for (i = 0; i < nvalues; i ++)
values[i] = 1.0;
HYPRE_SStructVectorSetBoxValues(b, part, ilower, iupper, var, values);
for (i = 0; i < nvalues; i ++)
values[i] = 0.0;
HYPRE_SStructVectorSetBoxValues(x, part, ilower, iupper, var, values);
}
}
/* This is a collective call finalizing the vector assembly.
The vectors are now ``ready to be used'' */
HYPRE_SStructVectorAssemble(b);
HYPRE_SStructVectorAssemble(x);
}
/* 6. Set up and use a solver (See the Reference Manual for descriptions
of all of the options.) */
{
HYPRE_StructMatrix sA;
HYPRE_StructVector sb;
HYPRE_StructVector sx;
/* Because we are using a struct solver, we need to get the
object of the matrix and vectors to pass in to the struct solvers */
HYPRE_SStructMatrixGetObject(A, (void **) &sA);
HYPRE_SStructVectorGetObject(b, (void **) &sb);
HYPRE_SStructVectorGetObject(x, (void **) &sx);
/* Create an empty PCG Struct solver */
HYPRE_StructPCGCreate(MPI_COMM_WORLD, &solver);
/* Set PCG parameters */
HYPRE_StructPCGSetTol(solver, 1.0e-06);
HYPRE_StructPCGSetPrintLevel(solver, 2);
HYPRE_StructPCGSetMaxIter(solver, 50);
/* Create the Struct SMG solver for use as a preconditioner */
HYPRE_StructSMGCreate(MPI_COMM_WORLD, &precond);
/* Set SMG parameters */
HYPRE_StructSMGSetMaxIter(precond, 1);
HYPRE_StructSMGSetTol(precond, 0.0);
HYPRE_StructSMGSetZeroGuess(precond);
HYPRE_StructSMGSetNumPreRelax(precond, 1);
HYPRE_StructSMGSetNumPostRelax(precond, 1);
/* Set preconditioner and solve */
HYPRE_StructPCGSetPrecond(solver, HYPRE_StructSMGSolve,
HYPRE_StructSMGSetup, precond);
HYPRE_StructPCGSetup(solver, sA, sb, sx);
HYPRE_StructPCGSolve(solver, sA, sb, sx);
}
/* Free memory */
HYPRE_SStructGridDestroy(grid);
HYPRE_SStructStencilDestroy(stencil);
HYPRE_SStructGraphDestroy(graph);
HYPRE_SStructMatrixDestroy(A);
HYPRE_SStructVectorDestroy(b);
HYPRE_SStructVectorDestroy(x);
HYPRE_StructPCGDestroy(solver);
HYPRE_StructSMGDestroy(precond);
/* Finalize MPI */
MPI_Finalize();
return (0);
}
int main (int argc, char *argv[])
{
int i, j;
int myid, num_procs;
HYPRE_StructGrid grid;
HYPRE_StructStencil stencil;
HYPRE_StructMatrix A;
HYPRE_StructVector b;
HYPRE_StructVector x;
HYPRE_StructSolver solver;
HYPRE_StructSolver precond;
/* Initialize MPI */
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &myid);
MPI_Comm_size(MPI_COMM_WORLD, &num_procs);
if (num_procs != 2)
{
if (myid ==0) printf("Must run with 2 processors!\n");
MPI_Finalize();
return(0);
}
/* 1. Set up a grid */
{
/* Create an empty 2D grid object */
HYPRE_StructGridCreate(MPI_COMM_WORLD, 2, &grid);
/* Processor 0 owns two boxes in the grid. */
if (myid == 0)
{
/* Add a new box to the grid */
{
int ilower[2] = {-3, 1};
int iupper[2] = {-1, 2};
HYPRE_StructGridSetExtents(grid, ilower, iupper);
}
/* Add a new box to the grid */
{
int ilower[2] = {0, 1};
int iupper[2] = {2, 4};
HYPRE_StructGridSetExtents(grid, ilower, iupper);
}
}
/* Processor 1 owns one box in the grid. */
else if (myid == 1)
{
/* Add a new box to the grid */
{
int ilower[2] = {3, 1};
int iupper[2] = {6, 4};
HYPRE_StructGridSetExtents(grid, ilower, iupper);
}
}
/* This is a collective call finalizing the grid assembly.
The grid is now ``ready to be used'' */
HYPRE_StructGridAssemble(grid);
}
/* 2. Define the discretization stencil */
{
/* Create an empty 2D, 5-pt stencil object */
HYPRE_StructStencilCreate(2, 5, &stencil);
/* Define the geometry of the stencil. Each represents a
relative offset (in the index space). */
{
int entry;
int offsets[5][2] = {{0,0}, {-1,0}, {1,0}, {0,-1}, {0,1}};
/* Assign each of the 5 stencil entries */
for (entry = 0; entry < 5; entry++)
HYPRE_StructStencilSetElement(stencil, entry, offsets[entry]);
}
}
/* 3. Set up a Struct Matrix */
{
/* Create an empty matrix object */
HYPRE_StructMatrixCreate(MPI_COMM_WORLD, grid, stencil, &A);
/* Indicate that the matrix coefficients are ready to be set */
HYPRE_StructMatrixInitialize(A);
if (myid == 0)
{
/* Set the matrix coefficients for some set of stencil entries
over all the gridpoints in my first box (account for boundary
grid points later) */
{
int ilower[2] = {-3, 1};
int iupper[2] = {-1, 2};
int nentries = 5;
int nvalues = 30; /* 6 grid points, each with 5 stencil entries */
double values[30];
int stencil_indices[5];
for (j = 0; j < nentries; j++) /* label the stencil indices -
these correspond to the offsets
defined above */
stencil_indices[j] = j;
for (i = 0; i < nvalues; i += nentries)
{
values[i] = 4.0;
for (j = 1; j < nentries; j++)
values[i+j] = -1.0;
}
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, nentries,
stencil_indices, values);
}
/* Set the matrix coefficients for some set of stencil entries
over the gridpoints in my second box */
{
int ilower[2] = {0, 1};
int iupper[2] = {2, 4};
int nentries = 5;
int nvalues = 60; /* 12 grid points, each with 5 stencil entries */
double values[60];
int stencil_indices[5];
for (j = 0; j < nentries; j++)
stencil_indices[j] = j;
for (i = 0; i < nvalues; i += nentries)
{
values[i] = 4.0;
for (j = 1; j < nentries; j++)
values[i+j] = -1.0;
}
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, nentries,
stencil_indices, values);
}
}
else if (myid == 1)
{
/* Set the matrix coefficients for some set of stencil entries
over the gridpoints in my box */
{
int ilower[2] = {3, 1};
int iupper[2] = {6, 4};
int nentries = 5;
int nvalues = 80; /* 16 grid points, each with 5 stencil entries */
double values[80];
int stencil_indices[5];
for (j = 0; j < nentries; j++)
stencil_indices[j] = j;
for (i = 0; i < nvalues; i += nentries)
{
values[i] = 4.0;
for (j = 1; j < nentries; j++)
values[i+j] = -1.0;
}
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, nentries,
stencil_indices, values);
}
}
/* For each box, set any coefficients that reach ouside of the
boundary to 0 */
if (myid == 0)
{
int maxnvalues = 6;
double values[6];
for (i = 0; i < maxnvalues; i++)
values[i] = 0.0;
{
/* Values below our first AND second box */
int ilower[2] = {-3, 1};
int iupper[2] = { 2, 1};
int stencil_indices[1] = {3};
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, 1,
stencil_indices, values);
}
{
/* Values to the left of our first box */
int ilower[2] = {-3, 1};
int iupper[2] = {-3, 2};
int stencil_indices[1] = {1};
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, 1,
stencil_indices, values);
}
{
/* Values above our first box */
int ilower[2] = {-3, 2};
int iupper[2] = {-1, 2};
int stencil_indices[1] = {4};
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, 1,
stencil_indices, values);
}
{
/* Values to the left of our second box (that do not border the
first box). */
int ilower[2] = { 0, 3};
int iupper[2] = { 0, 4};
int stencil_indices[1] = {1};
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, 1,
stencil_indices, values);
}
{
/* Values above our second box */
int ilower[2] = { 0, 4};
int iupper[2] = { 2, 4};
int stencil_indices[1] = {4};
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, 1,
stencil_indices, values);
}
}
else if (myid == 1)
{
int maxnvalues = 4;
double values[4];
for (i = 0; i < maxnvalues; i++)
values[i] = 0.0;
{
/* Values below our box */
int ilower[2] = { 3, 1};
int iupper[2] = { 6, 1};
int stencil_indices[1] = {3};
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, 1,
stencil_indices, values);
}
{
/* Values to the right of our box */
int ilower[2] = { 6, 1};
int iupper[2] = { 6, 4};
int stencil_indices[1] = {2};
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, 1,
stencil_indices, values);
}
{
/* Values above our box */
int ilower[2] = { 3, 4};
int iupper[2] = { 6, 4};
int stencil_indices[1] = {4};
HYPRE_StructMatrixSetBoxValues(A, ilower, iupper, 1,
stencil_indices, values);
}
}
/* This is a collective call finalizing the matrix assembly.
The matrix is now ``ready to be used'' */
HYPRE_StructMatrixAssemble(A);
}
/* 4. Set up Struct Vectors for b and x */
{
/* Create an empty vector object */
HYPRE_StructVectorCreate(MPI_COMM_WORLD, grid, &b);
HYPRE_StructVectorCreate(MPI_COMM_WORLD, grid, &x);
/* Indicate that the vector coefficients are ready to be set */
HYPRE_StructVectorInitialize(b);
HYPRE_StructVectorInitialize(x);
if (myid == 0)
{
/* Set the vector coefficients over the gridpoints in my first box */
{
int ilower[2] = {-3, 1};
int iupper[2] = {-1, 2};
int nvalues = 6; /* 6 grid points */
double values[6];
for (i = 0; i < nvalues; i ++)
values[i] = 1.0;
HYPRE_StructVectorSetBoxValues(b, ilower, iupper, values);
for (i = 0; i < nvalues; i ++)
values[i] = 0.0;
HYPRE_StructVectorSetBoxValues(x, ilower, iupper, values);
}
/* Set the vector coefficients over the gridpoints in my second box */
{
int ilower[2] = { 0, 1};
int iupper[2] = { 2, 4};
int nvalues = 12; /* 12 grid points */
double values[12];
for (i = 0; i < nvalues; i ++)
values[i] = 1.0;
HYPRE_StructVectorSetBoxValues(b, ilower, iupper, values);
for (i = 0; i < nvalues; i ++)
values[i] = 0.0;
HYPRE_StructVectorSetBoxValues(x, ilower, iupper, values);
}
}
else if (myid == 1)
{
/* Set the vector coefficients over the gridpoints in my box */
{
int ilower[2] = { 3, 1};
int iupper[2] = { 6, 4};
int nvalues = 16; /* 16 grid points */
double values[16];
for (i = 0; i < nvalues; i ++)
values[i] = 1.0;
HYPRE_StructVectorSetBoxValues(b, ilower, iupper, values);
for (i = 0; i < nvalues; i ++)
values[i] = 0.0;
HYPRE_StructVectorSetBoxValues(x, ilower, iupper, values);
}
}
/* This is a collective call finalizing the vector assembly.
The vectors are now ``ready to be used'' */
HYPRE_StructVectorAssemble(b);
HYPRE_StructVectorAssemble(x);
}
/* 5. Set up and use a solver (See the Reference Manual for descriptions
of all of the options.) */
{
/* Create an empty PCG Struct solver */
HYPRE_StructPCGCreate(MPI_COMM_WORLD, &solver);
/* Set PCG parameters */
HYPRE_StructPCGSetTol(solver, 1.0e-06);
HYPRE_StructPCGSetPrintLevel(solver, 2);
HYPRE_StructPCGSetMaxIter(solver, 50);
/* Use symmetric SMG as preconditioner */
HYPRE_StructSMGCreate(MPI_COMM_WORLD, &precond);
HYPRE_StructSMGSetMaxIter(precond, 1);
HYPRE_StructSMGSetTol(precond, 0.0);
HYPRE_StructSMGSetZeroGuess(precond);
HYPRE_StructSMGSetNumPreRelax(precond, 1);
HYPRE_StructSMGSetNumPostRelax(precond, 1);
/* Set preconditioner and solve */
HYPRE_StructPCGSetPrecond(solver, HYPRE_StructSMGSolve,
HYPRE_StructSMGSetup, precond);
HYPRE_StructPCGSetup(solver, A, b, x);
HYPRE_StructPCGSolve(solver, A, b, x);
}
/* Free memory */
HYPRE_StructGridDestroy(grid);
HYPRE_StructStencilDestroy(stencil);
HYPRE_StructMatrixDestroy(A);
HYPRE_StructVectorDestroy(b);
HYPRE_StructVectorDestroy(x);
HYPRE_StructPCGDestroy(solver);
HYPRE_StructSMGDestroy(precond);
/* Finalize MPI */
MPI_Finalize();
return (0);
}