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Stokhos_IfpackPreconditionerFactory.cpp
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41
42#include "Stokhos_ConfigDefs.h"
44#include "Epetra_RowMatrix.h"
45#include "Epetra_CrsMatrix.h"
46#include "Teuchos_Assert.hpp"
47#ifdef HAVE_STOKHOS_IFPACK
48#include "Ifpack.h"
49#endif
50
52IfpackPreconditionerFactory(const Teuchos::RCP<Teuchos::ParameterList>& p) :
53 precParams(p)
54{
55}
56
57Teuchos::RCP<Epetra_Operator>
59compute(const Teuchos::RCP<Epetra_Operator>& op, bool compute_prec) {
60#ifdef HAVE_STOKHOS_IFPACK
61 Teuchos::RCP<Epetra_RowMatrix> mat =
62 Teuchos::rcp_dynamic_cast<Epetra_RowMatrix>(op, true);
63 Ifpack Factory;
64 std::string prec = precParams->get("Ifpack Preconditioner", "ILU");
65 int overlap = precParams->get("Overlap", 0);
66 Teuchos::RCP<Ifpack_Preconditioner> ifpackPrec =
67 Teuchos::rcp(Factory.Create(prec, mat.get(), overlap));
68 ifpackPrec->SetParameters(*precParams);
69 ifpackPrec->Initialize();
70 if (compute_prec)
71 ifpackPrec->Compute();
72 return ifpackPrec;
73#else
74 TEUCHOS_TEST_FOR_EXCEPTION(true, std::logic_error,
75 "Stokhos::IfpackPreconditionerFactory is available " <<
76 "only with configured with Ifpack support!");
77 return Teuchos::null;
78#endif // HAVE_STOKHOS_IFPACK
79}
80
81void
83recompute(const Teuchos::RCP<Epetra_Operator>& op,
84 const Teuchos::RCP<Epetra_Operator>& prec_op) {
85#ifdef HAVE_STOKHOS_IFPACK
86 // Copy matrix represented by "op" into underlying matrix in Ifpack
87 Teuchos::RCP<Epetra_CrsMatrix> mat =
88 Teuchos::rcp_dynamic_cast<Epetra_CrsMatrix>(op, true);
89 Teuchos::RCP<Ifpack_Preconditioner> ifpackPrec =
90 Teuchos::rcp_dynamic_cast<Ifpack_Preconditioner>(prec_op);
91 const Epetra_RowMatrix& prec_mat = ifpackPrec->Matrix();
92 const Epetra_CrsMatrix& prec_crs_mat =
93 dynamic_cast<const Epetra_CrsMatrix&>(prec_mat);
94 Epetra_CrsMatrix& non_const_prec_crs_mat =
95 const_cast<Epetra_CrsMatrix&>(prec_crs_mat);
96 non_const_prec_crs_mat = *mat;
97
98 // Compute preconditioenr
99 ifpackPrec->Compute();
100#else
101 TEUCHOS_TEST_FOR_EXCEPTION(true, std::logic_error,
102 "Stokhos::IfpackPreconditionerFactory is available " <<
103 "only with configured with Ifpack support!");
104#endif // HAVE_STOKHOS_IFPACK
105}
virtual Teuchos::RCP< Epetra_Operator > compute(const Teuchos::RCP< Epetra_Operator > &op, bool compute_prec=true)
Compute preconditioner.
IfpackPreconditionerFactory(const Teuchos::RCP< Teuchos::ParameterList > &p)
Constructor.
virtual void recompute(const Teuchos::RCP< Epetra_Operator > &op, const Teuchos::RCP< Epetra_Operator > &prec)
Recompute preconditioner operator for a new matrix.