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Reference documentation for deal.II version 8.1.0
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#include <trilinos_precondition.h>
Classes | |
struct | AdditionalData |
Public Member Functions | |
void | initialize (const SparseMatrix &matrix, const AdditionalData &additional_data=AdditionalData()) |
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PreconditionBase () | |
PreconditionBase (const PreconditionBase &) | |
~PreconditionBase () | |
void | clear () |
virtual void | vmult (VectorBase &dst, const VectorBase &src) const |
virtual void | Tvmult (VectorBase &dst, const VectorBase &src) const |
virtual void | vmult (::Vector< double > &dst, const ::Vector< double > &src) const |
virtual void | Tvmult (::Vector< double > &dst, const ::Vector< double > &src) const |
virtual void | vmult (::parallel::distributed::Vector< double > &dst, const ::parallel::distributed::Vector< double > &src) const |
virtual void | Tvmult (::parallel::distributed::Vector< double > &dst, const ::parallel::distributed::Vector< double > &src) const |
DeclException1 (ExcNonMatchingMaps, std::string,<< "The sparse matrix the preconditioner is based on "<< "uses a map that is not compatible to the one in vector "<< arg1<< ". Check preconditioner and matrix setup.") | |
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Subscriptor () | |
Subscriptor (const Subscriptor &) | |
virtual | ~Subscriptor () |
Subscriptor & | operator= (const Subscriptor &) |
void | subscribe (const char *identifier=0) const |
void | unsubscribe (const char *identifier=0) const |
unsigned int | n_subscriptions () const |
void | list_subscribers () const |
DeclException3 (ExcInUse, int, char *, std::string &,<< "Object of class "<< arg2<< " is still used by "<< arg1<< " other objects.\n"<< "(Additional information: "<< arg3<< ")\n"<< "Note the entry in the Frequently Asked Questions of "<< "deal.II (linked to from http://www.dealii.org/) for "<< "more information on what this error means.") | |
DeclException2 (ExcNoSubscriber, char *, char *,<< "No subscriber with identifier \""<< arg2<< "\" did subscribe to this object of class "<< arg1) | |
template<class Archive > | |
void | serialize (Archive &ar, const unsigned int version) |
Additional Inherited Members | |
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typedef ::types::global_dof_index | size_type |
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std_cxx1x::shared_ptr < Epetra_Operator > | preconditioner |
Epetra_MpiComm | communicator |
std_cxx1x::shared_ptr< Epetra_Map > | vector_distributor |
A wrapper class for a (pointwise) SOR preconditioner for Trilinos matrices. This preconditioner works both in serial and in parallel, depending on the matrix it is based on.
The AdditionalData data structure allows to set preconditioner options. For the SOR preconditioner, these options are the damping/relaxation parameter omega
, a min_diagonal
argument that can be used to make the preconditioner work even if the matrix contains some zero elements on the diagonal, and a parameter overlap
that determines if and how much overlap there should be between the matrix partitions on the various MPI processes. The default settings are 1 for the relaxation parameter, 0 for the diagonal augmentation and 0 for the overlap.
Note that a parallel application of the SOR preconditioner is actually a block-Jacobi preconditioner with block size equal to the local matrix size. Spoken more technically, this parallel operation is an additive Schwarz method with an SOR approximate solve as inner solver, based on the outer parallel partitioning.
Definition at line 463 of file trilinos_precondition.h.
void TrilinosWrappers::PreconditionSOR::initialize | ( | const SparseMatrix & | matrix, |
const AdditionalData & | additional_data = AdditionalData() |
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Take the sparse matrix the preconditioner object should be built of, and additional flags (damping parameter, overlap in parallel computations etc.) if there are any.