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sparse_solver_petsc.cc
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Wed, May 7, 09:42

sparse_solver_petsc.cc
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/**
* Copyright (©) 2014-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This file is part of Akantu
*
* Akantu is free software: you can 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 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*/
/* -------------------------------------------------------------------------- */
#include "sparse_solver_petsc.hh"
#include "dof_manager_petsc.hh"
#include "mpi_communicator_data.hh"
#include "solver_vector_petsc.hh"
#include "sparse_matrix_petsc.hh"
/* -------------------------------------------------------------------------- */
#include <petscksp.h>
// #include <petscsys.h>
/* -------------------------------------------------------------------------- */
namespace akantu {
/* -------------------------------------------------------------------------- */
SparseSolverPETSc::SparseSolverPETSc(DOFManager & dof_manager,
const ID & matrix_id, const ID & id)
: ParsablePETSc<SparseSolver, KSP>(ksp, KSPSetFromOptions, dof_manager,
matrix_id, id) {
auto && mpi_comm = getDOFManager().getMPIComm();
/// create a solver context
KSPCreate(mpi_comm, &this->ksp);
}
/* -------------------------------------------------------------------------- */
void SparseSolverPETSc::initialize() {}
/* -------------------------------------------------------------------------- */
SparseSolverPETSc::~SparseSolverPETSc() { KSPDestroy(&ksp); }
/* -------------------------------------------------------------------------- */
void SparseSolverPETSc::setOperators() {
auto && matrix = getDOFManager().getMatrix(matrix_id);
// set the matrix that defines the linear system and the matrix for
// preconditioning (here they are the same)
#if PETSC_VERSION_GE(3, 5, 0)
KSPSetOperators(ksp, matrix.getMat(), matrix.getMat());
#else
KSPSetOperators(ksp, matrix.getMat(), matrix.getMat(), SAME_NONZERO_PATTERN);
#endif
// If this is not called the solution vector is zeroed in the call to
// KSPSolve().
// @Nicolas: when this is done, the increment guess is completely wrong
// (as it decays fast to zero in principle)
// For some reason (I do not understand) a second solve in the phase field
// problem is not made correctly with this setup=>to investigate
// => uncommenting this line breaks test_phase_solid_coupling.cc when using a
// sparse_petsc_solver
// KSPSetInitialGuessNonzero(ksp, PETSC_TRUE);
try {
KSPSetUp(ksp);
} catch (std::exception & e) {
AKANTU_EXCEPTION("PETSc KSP sparse solver initialization failed: is your "
"matrix singular ?\n"
<< e.what());
}
}
/* -------------------------------------------------------------------------- */
void SparseSolverPETSc::solve() {
Vec & rhs(getDOFManager()._getResidual());
Vec & solution(getDOFManager()._getSolution());
this->setOperators();
KSPSolve(ksp, rhs, solution);
this->dof_manager.splitSolutionPerDOFs();
}
/* -------------------------------------------------------------------------- */
DOFManagerPETSc & SparseSolverPETSc::getDOFManager() {
return aka::as_type<DOFManagerPETSc &>(this->dof_manager);
}
} // namespace akantu

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