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MFEM
v4.4.0
Finite element discretization library
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MFEM
v4.4.0
Finite element discretization library
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#include <ginkgo.hpp>
Public Member Functions | |
| FCGSolver (GinkgoExecutor &exec) | |
| FCGSolver (GinkgoExecutor &exec, const GinkgoPreconditioner &preconditioner) | |
 Public Member Functions inherited from mfem::Ginkgo::EnableGinkgoSolver< gko::solver::Fcg< double > > | |
| EnableGinkgoSolver (GinkgoExecutor &exec, bool use_implicit_res_norm) | |
| void | SetRelTol (double rtol) |
| void | SetAbsTol (double atol) |
| void | SetMaxIter (int max_it) |
| Public Member Functions inherited from mfem::Ginkgo::GinkgoIterativeSolver | |
| const std::shared_ptr < gko::LinOpFactory > | GetFactory () const |
| void | SetPrintLevel (int print_lvl) |
| int | GetNumIterations () const |
| int | GetConverged () const |
| double | GetFinalNorm () const |
| virtual void | SetOperator (const Operator &op) |
| virtual void | Mult (const Vector &x, Vector &y) const |
| bool | UsesVectorWrappers () const |
| virtual | ~GinkgoIterativeSolver ()=default |
| Public Member Functions inherited from mfem::Solver | |
| Solver (int s=0, bool iter_mode=false) | |
| Initialize a square Solver with size s. More... | |
| Solver (int h, int w, bool iter_mode=false) | |
| Initialize a Solver with height h and width w. More... | |
| Public Member Functions inherited from mfem::Operator | |
| void | InitTVectors (const Operator *Po, const Operator *Ri, const Operator *Pi, Vector &x, Vector &b, Vector &X, Vector &B) const |
| Initializes memory for true vectors of linear system. More... | |
| Operator (int s=0) | |
| Construct a square Operator with given size s (default 0). More... | |
| Operator (int h, int w) | |
| Construct an Operator with the given height (output size) and width (input size). More... | |
| int | Height () const |
| Get the height (size of output) of the Operator. Synonym with NumRows(). More... | |
| int | NumRows () const |
| Get the number of rows (size of output) of the Operator. Synonym with Height(). More... | |
| int | Width () const |
| Get the width (size of input) of the Operator. Synonym with NumCols(). More... | |
| int | NumCols () const |
| Get the number of columns (size of input) of the Operator. Synonym with Width(). More... | |
| virtual MemoryClass | GetMemoryClass () const |
| Return the MemoryClass preferred by the Operator. More... | |
| virtual void | MultTranspose (const Vector &x, Vector &y) const |
Action of the transpose operator: y=A^t(x). The default behavior in class Operator is to generate an error. More... | |
| virtual Operator & | GetGradient (const Vector &x) const |
| Evaluate the gradient operator at the point x. The default behavior in class Operator is to generate an error. More... | |
| virtual void | AssembleDiagonal (Vector &diag) const |
| Computes the diagonal entries into diag. Typically, this operation only makes sense for linear Operators. In some cases, only an approximation of the diagonal is computed. More... | |
| virtual const Operator * | GetProlongation () const |
Prolongation operator from linear algebra (linear system) vectors, to input vectors for the operator. NULL means identity. More... | |
| virtual const Operator * | GetRestriction () const |
Restriction operator from input vectors for the operator to linear algebra (linear system) vectors. NULL means identity. More... | |
| virtual const Operator * | GetOutputProlongation () const |
Prolongation operator from linear algebra (linear system) vectors, to output vectors for the operator. NULL means identity. More... | |
| virtual const Operator * | GetOutputRestrictionTranspose () const |
| Transpose of GetOutputRestriction, directly available in this form to facilitate matrix-free RAP-type operators. More... | |
| virtual const Operator * | GetOutputRestriction () const |
Restriction operator from output vectors for the operator to linear algebra (linear system) vectors. NULL means identity. More... | |
| void | FormLinearSystem (const Array< int > &ess_tdof_list, Vector &x, Vector &b, Operator *&A, Vector &X, Vector &B, int copy_interior=0) |
| Form a constrained linear system using a matrix-free approach. More... | |
| void | FormRectangularLinearSystem (const Array< int > &trial_tdof_list, const Array< int > &test_tdof_list, Vector &x, Vector &b, Operator *&A, Vector &X, Vector &B) |
| Form a column-constrained linear system using a matrix-free approach. More... | |
| virtual void | RecoverFEMSolution (const Vector &X, const Vector &b, Vector &x) |
| Reconstruct a solution vector x (e.g. a GridFunction) from the solution X of a constrained linear system obtained from Operator::FormLinearSystem() or Operator::FormRectangularLinearSystem(). More... | |
| void | FormSystemOperator (const Array< int > &ess_tdof_list, Operator *&A) |
| Return in A a parallel (on truedofs) version of this square operator. More... | |
| void | FormRectangularSystemOperator (const Array< int > &trial_tdof_list, const Array< int > &test_tdof_list, Operator *&A) |
| Return in A a parallel (on truedofs) version of this rectangular operator (including constraints). More... | |
| void | FormDiscreteOperator (Operator *&A) |
| Return in A a parallel (on truedofs) version of this rectangular operator. More... | |
| void | PrintMatlab (std::ostream &out, int n, int m=0) const |
| Prints operator with input size n and output size m in Matlab format. More... | |
| virtual void | PrintMatlab (std::ostream &out) const |
| Prints operator in Matlab format. More... | |
| virtual | ~Operator () |
| Virtual destructor. More... | |
| Type | GetType () const |
| Return the type ID of the Operator class. More... | |
Additional Inherited Members | |
| Public Types inherited from mfem::Operator | |
| enum | DiagonalPolicy { DIAG_ZERO, DIAG_ONE, DIAG_KEEP } |
| Defines operator diagonal policy upon elimination of rows and/or columns. More... | |
| enum | Type { ANY_TYPE, MFEM_SPARSEMAT, Hypre_ParCSR, PETSC_MATAIJ, PETSC_MATIS, PETSC_MATSHELL, PETSC_MATNEST, PETSC_MATHYPRE, PETSC_MATGENERIC, Complex_Operator, MFEM_ComplexSparseMat, Complex_Hypre_ParCSR } |
| Enumeration defining IDs for some classes derived from Operator. More... | |
| Public Attributes inherited from mfem::Solver | |
| bool | iterative_mode |
| If true, use the second argument of Mult() as an initial guess. More... | |
| Protected Member Functions inherited from mfem::Ginkgo::GinkgoIterativeSolver | |
| GinkgoIterativeSolver (GinkgoExecutor &exec, bool use_implicit_res_norm) | |
| void | update_stop_factory () |
| Protected Member Functions inherited from mfem::Operator | |
| void | FormConstrainedSystemOperator (const Array< int > &ess_tdof_list, ConstrainedOperator *&Aout) |
| see FormSystemOperator() More... | |
| void | FormRectangularConstrainedSystemOperator (const Array< int > &trial_tdof_list, const Array< int > &test_tdof_list, RectangularConstrainedOperator *&Aout) |
| see FormRectangularSystemOperator() More... | |
| Operator * | SetupRAP (const Operator *Pi, const Operator *Po) |
| Returns RAP Operator of this, using input/output Prolongation matrices Pi corresponds to "P", Po corresponds to "Rt". More... | |
| Protected Attributes inherited from mfem::Ginkgo::GinkgoIterativeSolver | |
| bool | use_implicit_res_norm |
| int | print_level |
| int | max_iter |
| double | rel_tol |
| double | abs_tol |
| double | final_norm |
| int | final_iter |
| int | converged |
| std::shared_ptr < gko::LinOpFactory > | solver_gen |
| std::shared_ptr< gko::LinOp > | solver |
| std::shared_ptr < gko::stop::ResidualNorm <>::Factory > | rel_criterion |
| std::shared_ptr < gko::stop::ResidualNorm <>::Factory > | abs_criterion |
| std::shared_ptr < gko::stop::ImplicitResidualNorm <>::Factory > | imp_rel_criterion |
| std::shared_ptr < gko::stop::ImplicitResidualNorm <>::Factory > | imp_abs_criterion |
| std::shared_ptr < gko::log::Convergence<> > | convergence_logger |
| std::shared_ptr< ResidualLogger<> > | residual_logger |
| std::shared_ptr < gko::stop::Combined::Factory > | combined_factory |
| std::shared_ptr< gko::Executor > | executor |
| bool | needs_wrapped_vecs |
| bool | sub_op_needs_wrapped_vecs |
| Protected Attributes inherited from mfem::Operator | |
| int | height |
| Dimension of the output / number of rows in the matrix. More... | |
| int | width |
| Dimension of the input / number of columns in the matrix. More... | |
An implementation of the solver interface using the Ginkgo FCG solver.
FCG or the flexible conjugate gradient method is an iterative type Krylov subspace method which is suitable for symmetric positive definite methods.
Though this method performs very well for symmetric positive definite matrices, it is in general not suitable for general matrices.
In contrast to the standard CG based on the Polack-Ribiere formula, the flexible CG uses the Fletcher-Reeves formula for creating the orthonormal vectors spanning the Krylov subspace. This increases the computational cost of every Krylov solver iteration but allows for non-constant preconditioners.
Definition at line 910 of file ginkgo.hpp.
| mfem::Ginkgo::FCGSolver::FCGSolver | ( | GinkgoExecutor & | exec | ) |
Constructor.
| [in] | exec | The execution paradigm for the solver. |
Definition at line 586 of file ginkgo.cpp.
| mfem::Ginkgo::FCGSolver::FCGSolver | ( | GinkgoExecutor & | exec, |
| const GinkgoPreconditioner & | preconditioner | ||
| ) |
Constructor.
| [in] | exec | The execution paradigm for the solver. |
| [in] | preconditioner | The preconditioner for the solver. |
Definition at line 594 of file ginkgo.cpp.
1.8.5
