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Merge pull request #12768 from kronbichler/mf_no_inner_faces
MatrixFree: Do not build inner face data if not requested
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// --------------------------------------------------------------------- | ||
// | ||
// Copyright (C) 2018 - 2020 by the deal.II authors | ||
// | ||
// This file is part of the deal.II library. | ||
// | ||
// The deal.II library is free software; you can use it, redistribute | ||
// it, and/or modify it under the terms of the GNU Lesser General | ||
// Public License as published by the Free Software Foundation; either | ||
// version 2.1 of the License, or (at your option) any later version. | ||
// The full text of the license can be found in the file LICENSE.md at | ||
// the top level directory of deal.II. | ||
// | ||
// --------------------------------------------------------------------- | ||
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// tests matrix-free face evaluation when only boundary faces but not inner | ||
// faces are enabled. Otherwise the same test as matrix_vector_faces_05 (FE_Q, | ||
// Laplacian, weak imposition of Dirichlet boundary condition) | ||
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#include <deal.II/base/function.h> | ||
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#include <deal.II/fe/fe_q.h> | ||
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#include "../tests.h" | ||
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#include "matrix_vector_faces_common.h" | ||
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template <int dim, int fe_degree> | ||
void | ||
test() | ||
{ | ||
Triangulation<dim> tria; | ||
GridGenerator::hyper_cube(tria); | ||
tria.refine_global(5 - dim); | ||
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FE_Q<dim> fe(fe_degree); | ||
DoFHandler<dim> dof(tria); | ||
dof.distribute_dofs(fe); | ||
AffineConstraints<double> constraints; | ||
constraints.close(); | ||
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deallog << "Testing " << dof.get_fe().get_name(); | ||
deallog << std::endl; | ||
// std::cout << "Number of cells: " << | ||
// dof.get_triangulation().n_active_cells() << std::endl; std::cout << "Number | ||
// of degrees of freedom: " << dof.n_dofs() << std::endl; std::cout << "Number | ||
// of constraints: " << constraints.n_constraints() << std::endl; | ||
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MappingQ<dim> mapping(dof.get_fe().degree + 1); | ||
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Vector<double> in(dof.n_dofs()), out(dof.n_dofs()); | ||
Vector<double> out_dist(out); | ||
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// Set random seed for reproducibility | ||
Testing::srand(42); | ||
for (unsigned int i = 0; i < dof.n_dofs(); ++i) | ||
{ | ||
if (constraints.is_constrained(i)) | ||
continue; | ||
const double entry = Testing::rand() / (double)RAND_MAX; | ||
in(i) = entry; | ||
} | ||
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constexpr unsigned int n_q_points_1d = fe_degree + 1; | ||
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// assemble sparse matrix with MeshWorker | ||
SparsityPattern sparsity; | ||
SparseMatrix<double> matrix; | ||
{ | ||
DynamicSparsityPattern d_sparsity(dof.n_dofs()); | ||
DoFTools::make_flux_sparsity_pattern(dof, d_sparsity); | ||
sparsity.copy_from(d_sparsity); | ||
} | ||
matrix.reinit(sparsity); | ||
MeshWorker::IntegrationInfoBox<dim> info_box; | ||
UpdateFlags update_flags = | ||
update_values | update_gradients | update_jacobians; | ||
info_box.add_update_flags_all(update_flags); | ||
info_box.initialize_gauss_quadrature(n_q_points_1d, | ||
n_q_points_1d, | ||
n_q_points_1d); | ||
info_box.initialize(dof.get_fe(), mapping); | ||
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MeshWorker::DoFInfo<dim> dof_info(dof); | ||
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MeshWorker::Assembler::MatrixSimple<SparseMatrix<double>> assembler; | ||
assembler.initialize(matrix); | ||
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MatrixIntegrator<dim> integrator; | ||
MeshWorker::integration_loop<dim, dim>( | ||
dof.begin_active(), dof.end(), dof_info, info_box, integrator, assembler); | ||
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matrix.vmult(out, in); | ||
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// zero constrained dofs | ||
for (unsigned int i = 0; i < dof.n_dofs(); ++i) | ||
if (constraints.is_constrained(i)) | ||
out(i) = 0; | ||
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MatrixFree<dim, double> mf_data; | ||
const QGauss<1> quad(n_q_points_1d > 0 ? n_q_points_1d : | ||
dof.get_fe().degree + 1); | ||
typename MatrixFree<dim, double>::AdditionalData data; | ||
data.tasks_parallel_scheme = MatrixFree<dim, double>::AdditionalData::none; | ||
data.tasks_block_size = 3; | ||
data.mapping_update_flags_boundary_faces = | ||
(update_gradients | update_JxW_values); | ||
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mf_data.reinit(mapping, dof, constraints, quad, data); | ||
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// Check that only boundary faces are set up as requested | ||
Assert(mf_data.n_inner_face_batches() == 0, ExcInternalError()); | ||
Assert(mf_data.n_boundary_face_batches() > 0, ExcInternalError()); | ||
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MatrixFreeTest<dim, fe_degree, n_q_points_1d, double, Vector<double>, 1> mf( | ||
mf_data); | ||
mf.vmult(out_dist, in); | ||
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out_dist -= out; | ||
const double diff_norm = out_dist.linfty_norm() / out.linfty_norm(); | ||
deallog << "Norm of difference: " << diff_norm << std::endl; | ||
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deallog << std::endl; | ||
} |
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DEAL:2d::Testing FE_Q<2>(1) | ||
DEAL:2d::Norm of difference: 0 | ||
DEAL:2d:: | ||
DEAL:2d::Testing FE_Q<2>(2) | ||
DEAL:2d::Norm of difference: 0 | ||
DEAL:2d:: | ||
DEAL:3d::Testing FE_Q<3>(1) | ||
DEAL:3d::Norm of difference: 0 | ||
DEAL:3d:: | ||
DEAL:3d::Testing FE_Q<3>(2) | ||
DEAL:3d::Norm of difference: 0 | ||
DEAL:3d:: |