From: Martin Kronbichler Date: Sun, 26 Feb 2023 22:24:54 +0000 (+0100) Subject: Fix bug in result of SolverCG when run in interleaved mode X-Git-Tag: v9.5.0-rc1~456^2~2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=241fce585fa6a0e1275865ec7f7a16f6848299f5;p=dealii.git Fix bug in result of SolverCG when run in interleaved mode --- diff --git a/include/deal.II/lac/solver_cg.h b/include/deal.II/lac/solver_cg.h index 63902fd915..d4d9018607 100644 --- a/include/deal.II/lac/solver_cg.h +++ b/include/deal.II/lac/solver_cg.h @@ -952,7 +952,7 @@ namespace internal std::enable_if_t, U> finalize_after_convergence(const unsigned int iteration_index) { - if (iteration_index % 2 == 1 || iteration_index == 2) + if (iteration_index % 2 == 1) this->x.add(this->alpha, this->p); else { @@ -968,9 +968,9 @@ namespace internal // previous_beta has not been applied at this stage, allowing us // to recover the previous search direction const Number alpha_plus_previous_alpha_over_beta = - this->alpha + this->previous_alpha / this->previous_beta; + this->alpha + this->previous_alpha / this->beta; const Number previous_alpha_over_beta = - this->previous_alpha / this->previous_beta; + this->previous_alpha / this->beta; DEAL_II_OPENMP_SIMD_PRAGMA for (unsigned int j = 0; j < end_range; ++j) diff --git a/tests/lac/solver_cg_interleave.cc b/tests/lac/solver_cg_interleave_01.cc similarity index 99% rename from tests/lac/solver_cg_interleave.cc rename to tests/lac/solver_cg_interleave_01.cc index c48efd677d..bdd4d5c350 100644 --- a/tests/lac/solver_cg_interleave.cc +++ b/tests/lac/solver_cg_interleave_01.cc @@ -69,6 +69,7 @@ monitor_norm(const unsigned int iteration, } + int main() { diff --git a/tests/lac/solver_cg_interleave.output b/tests/lac/solver_cg_interleave_01.output similarity index 100% rename from tests/lac/solver_cg_interleave.output rename to tests/lac/solver_cg_interleave_01.output diff --git a/tests/lac/solver_cg_interleave_02.cc b/tests/lac/solver_cg_interleave_02.cc new file mode 100644 index 0000000000..04c2b54935 --- /dev/null +++ b/tests/lac/solver_cg_interleave_02.cc @@ -0,0 +1,97 @@ +// --------------------------------------------------------------------- +// +// Copyright (C) 2023 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. +// +// --------------------------------------------------------------------- + +// Check the path of SolverCG that can apply loops to sub-ranges of the matrix +// in terms of the final solution vector, terminating at arbitrary numbers of +// iterations also when the solution has not converged yet, and make sure we +// obtain the same result as without interleaving. + + +#include +#include +#include +#include + +#include "../tests.h" + + +struct MyDiagonalMatrix +{ + MyDiagonalMatrix(const LinearAlgebra::distributed::Vector &diagonal) + : diagonal(diagonal) + {} + + void + vmult(LinearAlgebra::distributed::Vector & dst, + const LinearAlgebra::distributed::Vector &src) const + { + dst = src; + dst.scale(diagonal); + } + + void + vmult( + LinearAlgebra::distributed::Vector & dst, + const LinearAlgebra::distributed::Vector & src, + const std::function &before, + const std::function &after) + const + { + before(0, dst.size()); + vmult(dst, src); + after(0, dst.size()); + } + + const LinearAlgebra::distributed::Vector &diagonal; +}; + + + +int +main() +{ + initlog(); + + // Create diagonal matrix with entries between 1 and 15 + DiagonalMatrix> unit_matrix; + unit_matrix.get_vector().reinit(15); + unit_matrix.get_vector() = 1.0; + + LinearAlgebra::distributed::Vector matrix_entries(unit_matrix.m()); + for (unsigned int i = 0; i < unit_matrix.m(); ++i) + matrix_entries(i) = i + 1; + MyDiagonalMatrix matrix(matrix_entries); + + LinearAlgebra::distributed::Vector rhs(unit_matrix.m()), + sol(unit_matrix.m()); + rhs = 1.; + + for (unsigned int n_iter = 1; n_iter < 12; ++n_iter) + { + deallog << "Test solution accuracy with " << n_iter << " iterations" + << std::endl; + deallog << "Solve with PreconditionIdentity: " << std::endl; + IterationNumberControl control(n_iter, 1e-12); + SolverCG> solver(control); + sol = 0; + solver.solve(matrix, sol, rhs, PreconditionIdentity()); + sol.print(deallog.get_file_stream()); + + deallog << "Solve with diagonal preconditioner: " << std::endl; + sol = 0; + solver.solve(matrix, sol, rhs, unit_matrix); + sol.print(deallog.get_file_stream()); + } +} diff --git a/tests/lac/solver_cg_interleave_02.output b/tests/lac/solver_cg_interleave_02.output new file mode 100644 index 0000000000..ef5e2124ab --- /dev/null +++ b/tests/lac/solver_cg_interleave_02.output @@ -0,0 +1,166 @@ + +DEAL::Test solution accuracy with 1 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 1 value 2.09165 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 1 value 2.09165 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 1.250e-01 +DEAL::Test solution accuracy with 2 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 2 value 1.41681 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +3.309e-01 3.088e-01 2.868e-01 2.647e-01 2.426e-01 2.206e-01 1.985e-01 1.765e-01 1.544e-01 1.324e-01 1.103e-01 8.824e-02 6.618e-02 4.412e-02 2.206e-02 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 2 value 1.41681 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +3.309e-01 3.088e-01 2.868e-01 2.647e-01 2.426e-01 2.206e-01 1.985e-01 1.765e-01 1.544e-01 1.324e-01 1.103e-01 8.824e-02 6.618e-02 4.412e-02 2.206e-02 +DEAL::Test solution accuracy with 3 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 3 value 0.977692 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +5.539e-01 4.681e-01 3.905e-01 3.211e-01 2.598e-01 2.067e-01 1.618e-01 1.250e-01 9.641e-02 7.598e-02 6.373e-02 5.964e-02 6.373e-02 7.598e-02 9.641e-02 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 3 value 0.977692 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +5.539e-01 4.681e-01 3.905e-01 3.211e-01 2.598e-01 2.067e-01 1.618e-01 1.250e-01 9.641e-02 7.598e-02 6.373e-02 5.964e-02 6.373e-02 7.598e-02 9.641e-02 +DEAL::Test solution accuracy with 4 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 4 value 0.656069 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +7.417e-01 5.553e-01 4.081e-01 2.954e-01 2.128e-01 1.559e-01 1.200e-01 1.006e-01 9.331e-02 9.352e-02 9.675e-02 9.847e-02 9.417e-02 7.933e-02 4.945e-02 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 4 value 0.656069 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +7.417e-01 5.553e-01 4.081e-01 2.954e-01 2.128e-01 1.559e-01 1.200e-01 1.006e-01 9.331e-02 9.352e-02 9.675e-02 9.847e-02 9.417e-02 7.933e-02 4.945e-02 +DEAL::Test solution accuracy with 5 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 5 value 0.419623 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +8.709e-01 5.738e-01 3.754e-01 2.514e-01 1.806e-01 1.452e-01 1.304e-01 1.250e-01 1.208e-01 1.129e-01 9.972e-02 8.286e-02 6.721e-02 6.089e-02 7.528e-02 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 5 value 0.419623 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +8.709e-01 5.738e-01 3.754e-01 2.514e-01 1.806e-01 1.452e-01 1.304e-01 1.250e-01 1.208e-01 1.129e-01 9.972e-02 8.286e-02 6.721e-02 6.089e-02 7.528e-02 +DEAL::Test solution accuracy with 6 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 6 value 0.252694 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +9.447e-01 5.553e-01 3.404e-01 2.330e-01 1.848e-01 1.634e-01 1.498e-01 1.347e-01 1.165e-01 9.807e-02 8.398e-02 7.766e-02 7.856e-02 7.933e-02 6.298e-02 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 6 value 0.252694 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +9.447e-01 5.553e-01 3.404e-01 2.330e-01 1.848e-01 1.634e-01 1.498e-01 1.347e-01 1.165e-01 9.807e-02 8.398e-02 7.766e-02 7.856e-02 7.933e-02 6.298e-02 +DEAL::Test solution accuracy with 7 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 7 value 0.141859 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +9.799e-01 5.302e-01 3.246e-01 2.380e-01 1.991e-01 1.731e-01 1.484e-01 1.250e-01 1.068e-01 9.613e-02 9.133e-02 8.733e-02 7.895e-02 6.712e-02 6.801e-02 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 7 value 0.141859 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +9.799e-01 5.302e-01 3.246e-01 2.380e-01 1.991e-01 1.731e-01 1.484e-01 1.250e-01 1.068e-01 9.613e-02 9.133e-02 8.733e-02 7.895e-02 6.712e-02 6.801e-02 +DEAL::Test solution accuracy with 8 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 8 value 0.0735126 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +9.939e-01 5.127e-01 3.240e-01 2.474e-01 2.042e-01 1.698e-01 1.417e-01 1.221e-01 1.102e-01 1.019e-01 9.281e-02 8.245e-02 7.477e-02 7.324e-02 6.626e-02 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 8 value 0.0735126 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +9.939e-01 5.127e-01 3.240e-01 2.474e-01 2.042e-01 1.698e-01 1.417e-01 1.221e-01 1.102e-01 1.019e-01 9.281e-02 8.245e-02 7.477e-02 7.324e-02 6.626e-02 +DEAL::Test solution accuracy with 9 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 9 value 0.0347680 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +9.985e-01 5.042e-01 3.283e-01 2.514e-01 2.022e-01 1.660e-01 1.412e-01 1.250e-01 1.124e-01 1.004e-01 8.990e-02 8.285e-02 7.809e-02 7.083e-02 6.677e-02 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 9 value 0.0347680 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +9.985e-01 5.042e-01 3.283e-01 2.514e-01 2.022e-01 1.660e-01 1.412e-01 1.250e-01 1.124e-01 1.004e-01 8.990e-02 8.285e-02 7.809e-02 7.083e-02 6.677e-02 +DEAL::Test solution accuracy with 10 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 10 value 0.0147898 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +9.997e-01 5.010e-01 3.315e-01 2.515e-01 2.001e-01 1.658e-01 1.429e-01 1.256e-01 1.111e-01 9.947e-02 9.096e-02 8.382e-02 7.650e-02 7.158e-02 6.665e-02 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 10 value 0.0147898 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +9.997e-01 5.010e-01 3.315e-01 2.515e-01 2.001e-01 1.658e-01 1.429e-01 1.256e-01 1.111e-01 9.947e-02 9.096e-02 8.382e-02 7.650e-02 7.158e-02 6.665e-02 +DEAL::Test solution accuracy with 11 iterations +DEAL::Solve with PreconditionIdentity: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 11 value 0.00554307 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +1.000e+00 5.002e-01 3.329e-01 2.506e-01 1.997e-01 1.665e-01 1.431e-01 1.250e-01 1.109e-01 1.001e-01 9.106e-02 8.313e-02 7.703e-02 7.140e-02 6.667e-02 +DEAL::Solve with diagonal preconditioner: +DEAL:cg::Starting value 3.87298 +DEAL:cg::Convergence step 11 value 0.00554307 +Process #0 +Local range: [0, 15), global size: 15 +Vector data: +1.000e+00 5.002e-01 3.329e-01 2.506e-01 1.997e-01 1.665e-01 1.431e-01 1.250e-01 1.109e-01 1.001e-01 9.106e-02 8.313e-02 7.703e-02 7.140e-02 6.667e-02