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solver_petsc.cc
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Wed, Dec 4, 05:54

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 "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 {
/* -------------------------------------------------------------------------- */
SolverPETSc::SolverPETSc(DOFManagerPETSc & dof_manager, const ID & matrix_id,
const ID & id)
: SparseSolver(dof_manager, matrix_id, id), dof_manager(dof_manager),
matrix(dof_manager.getMatrix(matrix_id)) {
auto && mpi_comm = dof_manager.getMPIComm();
/// create a solver context
PETSc_call(KSPCreate, mpi_comm, &this->ksp);
}
/* -------------------------------------------------------------------------- */
SolverPETSc::~SolverPETSc() {
if (ksp != nullptr) {
PETSc_call(KSPDestroy, &ksp);
}
}
/* -------------------------------------------------------------------------- */
void SolverPETSc::setOperators() {
// set the matrix that defines the linear system and the matrix for
// preconditioning (here they are the same)
#if PETSC_VERSION_MAJOR >= 3 && PETSC_VERSION_MINOR >= 5
PETSc_call(KSPSetOperators, ksp, this->matrix.getMat(),
this->matrix.getMat());
#else
PETSc_call(KSPSetOperators, ksp, this->matrix.getMat(), this->matrix.getMat(),
SAME_NONZERO_PATTERN);
#endif
// If this is not called the solution vector is zeroed in the call to
// KSPSolve().
PETSc_call(KSPSetInitialGuessNonzero, ksp, PETSC_TRUE);
PETSc_call(KSPSetFromOptions, ksp);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void SolverPETSc::solve() {
Vec & rhs(this->dof_manager.getResidual());
Vec & solution(this->dof_manager.getSolution());
PETSc_call(KSPSolve, ksp, rhs, solution);
}
/* -------------------------------------------------------------------------- */
} // namespace akantu

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