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solver_vector_petsc.hh
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Tue, Dec 3, 14:03

solver_vector_petsc.hh
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/**
* Copyright (©) 2019-2023 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 "dof_manager_petsc.hh"
#include "solver_vector.hh"
/* -------------------------------------------------------------------------- */
#include <petscvec.h>
/* -------------------------------------------------------------------------- */
#ifndef AKANTU_SOLVER_VECTOR_PETSC_HH_
#define AKANTU_SOLVER_VECTOR_PETSC_HH_
namespace akantu {
class DOFManagerPETSc;
} // namespace akantu
namespace akantu {
/* -------------------------------------------------------------------------- */
namespace internal {
/* ------------------------------------------------------------------------ */
class PETScVector {
public:
virtual ~PETScVector() = default;
operator Vec &() { return x; }
operator const Vec &() const { return x; }
Int size() const {
PetscInt n;
PETSc_call(VecGetSize, x, &n);
return n;
}
Int local_size() const {
PetscInt n;
PETSc_call(VecGetLocalSize, x, &n);
return n;
}
AKANTU_GET_MACRO_NOT_CONST(Vec, x, auto &);
AKANTU_GET_MACRO(Vec, x, const auto &);
protected:
Vec x{nullptr};
};
} // namespace internal
/* -------------------------------------------------------------------------- */
/* -------------------------------------------------------------------------- */
class SolverVectorPETSc : public SolverVector, public internal::PETScVector {
public:
SolverVectorPETSc(DOFManagerPETSc & dof_manager,
const ID & id = "solver_vector_petsc");
SolverVectorPETSc(const SolverVectorPETSc & vector,
const ID & id = "solver_vector_petsc");
SolverVectorPETSc(Vec x, DOFManagerPETSc & dof_manager,
const ID & id = "solver_vector_petsc");
~SolverVectorPETSc() override;
// resize the vector to the size of the problem
void resize() override;
void set(Real val) override;
operator const Array<Real> &() const override;
SolverVector & operator+(const SolverVector & y) override;
SolverVector & copy(const SolverVector & y) override;
SolverVectorPETSc & operator=(const SolverVectorPETSc & y);
/// get values using processors global indexes
void getValues(const Array<Int> & idx, Array<Real> & values) const;
/// get values using processors local indexes
void getValuesLocal(const Array<Int> & idx, Array<Real> & values) const;
/// adding values to the vector using the global indices
void addValues(const Array<Int> & gidx, const Array<Real> & values,
Real scale_factor = 1.);
/// adding values to the vector using the local indices
void addValuesLocal(const Array<Int> & lidx, const Array<Real> & values,
Real scale_factor = 1.);
Int size() const override { return internal::PETScVector::size(); }
Int localSize() const override { return internal::PETScVector::local_size(); }
void printself(std::ostream & stream, int indent = 0) const override;
bool isDistributed() const override { return true; }
bool isFinite() const override;
protected:
void applyModifications();
void updateGhost();
protected:
DOFManagerPETSc & dof_manager;
// used for the conversion operator
Array<Real> cache;
};
/* -------------------------------------------------------------------------- */
namespace internal {
/* ------------------------------------------------------------------------ */
template <class Array> class PETScWrapedVector : public PETScVector {
public:
PETScWrapedVector(Array && array) : array(array) {
PETSc_call(VecCreateSeqWithArray, PETSC_COMM_SELF, 1, array.size(),
array.data(), &x);
}
~PETScWrapedVector() override { PETSc_call(VecDestroy, &x); }
private:
Array array;
};
/* ------------------------------------------------------------------------ */
template <bool read_only> class PETScLocalVector : public PETScVector {
public:
PETScLocalVector(const Vec & g) : g(g) {
PETSc_call(VecGetLocalVectorRead, g, x);
}
PETScLocalVector(const SolverVectorPETSc & g)
: PETScLocalVector(g.getVec()) {}
~PETScLocalVector() override {
PETSc_call(VecRestoreLocalVectorRead, g, x);
PETSc_call(VecDestroy, &x);
}
private:
const Vec & g;
};
template <> class PETScLocalVector<false> : public PETScVector {
public:
PETScLocalVector(Vec & g) : g(g) {
PETSc_call(VecGetLocalVectorRead, g, x);
}
PETScLocalVector(SolverVectorPETSc & g) : PETScLocalVector(g.getVec()) {}
~PETScLocalVector() override {
PETSc_call(VecRestoreLocalVectorRead, g, x);
PETSc_call(VecDestroy, &x);
}
private:
Vec & g;
};
/* ------------------------------------------------------------------------ */
template <class Array>
decltype(auto) make_petsc_wraped_vector(Array && array) {
return PETScWrapedVector<Array>(std::forward<Array>(array));
}
template <
typename V,
std::enable_if_t<std::is_same<Vec, std::decay_t<V>>::value> * = nullptr>
decltype(auto) make_petsc_local_vector(V && vec) {
constexpr auto read_only = std::is_const<std::remove_reference_t<V>>::value;
return PETScLocalVector<read_only>(vec);
}
template <typename V, std::enable_if_t<std::is_base_of<
SolverVector, std::decay_t<V>>::value> * = nullptr>
decltype(auto) make_petsc_local_vector(V && vec) {
constexpr auto read_only = std::is_const<std::remove_reference_t<V>>::value;
return PETScLocalVector<read_only>(
dynamic_cast<std::conditional_t<read_only, const SolverVectorPETSc,
SolverVectorPETSc> &>(vec));
}
} // namespace internal
} // namespace akantu
#endif /* AKANTU_SOLVER_VECTOR_PETSC_HH_ */

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