Reference documentation for deal.II version Git 0943bc0020 20211022 11:23:14 0400

#include <deal.II/lac/petsc_precondition.h>
Classes  
struct  AdditionalData 
Public Member Functions  
PreconditionBlockJacobi ()=default  
PreconditionBlockJacobi (const MatrixBase &matrix, const AdditionalData &additional_data=AdditionalData())  
PreconditionBlockJacobi (const MPI_Comm &communicator, const AdditionalData &additional_data=AdditionalData())  
void  initialize (const MatrixBase &matrix, const AdditionalData &additional_data=AdditionalData()) 
void  clear () 
void  vmult (VectorBase &dst, const VectorBase &src) const 
void  Tvmult (VectorBase &dst, const VectorBase &src) const 
const PC &  get_pc () const 
template<class Archive >  
void  serialize (Archive &ar, const unsigned int version) 
Subscriptor functionality  
Classes derived from Subscriptor provide a facility to subscribe to this object. This is mostly used by the SmartPointer class.  
void  subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const 
void  unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const 
unsigned int  n_subscriptions () const 
template<typename StreamType >  
void  list_subscribers (StreamType &stream) const 
void  list_subscribers () const 
Static Public Member Functions  
static ::ExceptionBase &  ExcInUse (int arg1, std::string arg2, std::string arg3) 
static ::ExceptionBase &  ExcNoSubscriber (std::string arg1, std::string arg2) 
Protected Member Functions  
void  initialize () 
void  create_pc () 
operator Mat () const  
Protected Attributes  
AdditionalData  additional_data 
PC  pc 
Mat  matrix 
A class that implements the interface to use the PETSc Block Jacobi preconditioner. PETSc defines the term "block Jacobi" as a preconditioner in which it looks at a number of diagonal blocks of the matrix and then defines a preconditioner in which the preconditioner matrix has the same block structure as only these diagonal blocks, and each diagonal block of the preconditioner is an approximation of the inverse of the corresponding block of the original matrix. The blocking structure of the matrix is determined by the association of degrees of freedom to the individual processors in an MPIparallel job. If you use this preconditioner on a sequential job (or an MPI job with only one process) then the entire matrix is the only block.
By default, PETSc uses an ILU(0) decomposition of each diagonal block of the matrix for preconditioning. This can be changed, as is explained in the relevant section of the PETSc manual, but is not implemented here.
See the comment in the base class PreconditionBase for when this preconditioner may or may not work.
Definition at line 222 of file petsc_precondition.h.

default 
Empty Constructor. You need to call initialize() before using this object.
PreconditionBlockJacobi< MatrixType, inverse_type >::PreconditionBlockJacobi  (  const MatrixBase &  matrix, 
const AdditionalData &  additional_data = AdditionalData() 

) 
Constructor. Take the matrix which is used to form the preconditioner, and additional flags if there are any.
Definition at line 189 of file petsc_precondition.cc.
PreconditionBlockJacobi< MatrixType, inverse_type >::PreconditionBlockJacobi  (  const MPI_Comm &  communicator, 
const AdditionalData &  additional_data = AdditionalData() 

) 
Same as above but without setting a matrix to form the preconditioner. Intended to be used with SLEPc objects.
Definition at line 175 of file petsc_precondition.cc.
void PreconditionBlockJacobi< MatrixType, inverse_type >::initialize  (  const MatrixBase &  matrix, 
const AdditionalData &  additional_data = AdditionalData() 

) 
Initialize the preconditioner object and calculate all data that is necessary for applying it in a solver. This function is automatically called when calling the constructor with the same arguments and is only used if you create the preconditioner without arguments.
Definition at line 208 of file petsc_precondition.cc.

protected 
Initialize the preconditioner object without knowing a particular matrix. This function sets up appropriate parameters to the underlying PETSc object after it has been created.
Definition at line 197 of file petsc_precondition.cc.

inherited 
Destroys the preconditioner, leaving an object like just after having called the constructor.
Definition at line 52 of file petsc_precondition.cc.

inherited 
Apply the preconditioner once to the given src vector.
Definition at line 66 of file petsc_precondition.cc.

inherited 
Apply the transpose preconditioner once to the given src vector.
Definition at line 76 of file petsc_precondition.cc.

inherited 
Give access to the underlying PETSc object.
Definition at line 113 of file petsc_precondition.cc.

protectedinherited 
Internal function to create the PETSc preconditioner object. Fails if called twice.
Definition at line 86 of file petsc_precondition.cc.

protectedinherited 
Conversion operator to get a representation of the matrix that represents this preconditioner. We use this inside the actual solver, where we need to pass this matrix to the PETSc solvers.
Definition at line 119 of file petsc_precondition.cc.

inherited 
Subscribes a user of the object by storing the pointer validity
. The subscriber may be identified by text supplied as identifier
.
Definition at line 136 of file subscriptor.cc.

inherited 
Unsubscribes a user from the object.
identifier
and the validity
pointer must be the same as the one supplied to subscribe(). Definition at line 156 of file subscriptor.cc.

inlineinherited 
Return the present number of subscriptions to this object. This allows to use this class for reference counted lifetime determination where the last one to unsubscribe also deletes the object.
Definition at line 301 of file subscriptor.h.

inlineinherited 
List the subscribers to the input stream
.
Definition at line 318 of file subscriptor.h.

inherited 
List the subscribers to deallog
.
Definition at line 204 of file subscriptor.cc.

inlineinherited 
Read or write the data of this object to or from a stream for the purpose of serialization using the BOOST serialization library.
This function does not actually serialize any of the member variables of this class. The reason is that what this class stores is only who subscribes to this object, but who does so at the time of storing the contents of this object does not necessarily have anything to do with who subscribes to the object when it is restored. Consequently, we do not want to overwrite the subscribers at the time of restoring, and then there is no reason to write the subscribers out in the first place.
Definition at line 310 of file subscriptor.h.

protected 
Store a copy of the flags for this particular preconditioner.
Definition at line 269 of file petsc_precondition.h.

protectedinherited 
the PETSc preconditioner object
Definition at line 101 of file petsc_precondition.h.

protectedinherited 
A pointer to the matrix that acts as a preconditioner.
Definition at line 106 of file petsc_precondition.h.