PETScWrappers::SolverCGS Class Reference

#include <deal.II/lac/petsc_solver.h>

Inheritance diagram for PETScWrappers::SolverCGS:

Classes
struct	AdditionalData

Public Member Functions
	SolverCGS (SolverControl &cn, const MPI_Comm &mpi_communicator=PETSC_COMM_SELF, const AdditionalData &data=AdditionalData())
void	solve (const MatrixBase &A, VectorBase &x, const VectorBase &b, const PreconditionBase &preconditioner)
virtual void	reset ()
void	set_prefix (const std::string &prefix)
SolverControl &	control () const
void	initialize (const PreconditionBase &preconditioner)

Protected Member Functions
virtual void	set_solver_type (KSP &ksp) const override

Protected Attributes
const AdditionalData	additional_data
SolverControl &	solver_control
const MPI_Comm	mpi_communicator
std::string	prefix_name

Static Private Member Functions
static PetscErrorCode	convergence_test (KSP ksp, const PetscInt iteration, const PetscReal residual_norm, KSPConvergedReason *reason, void *solver_control)

Private Attributes
std::unique_ptr< SolverData >	solver_data

Detailed Description

An implementation of the solver interface using the PETSc CG Squared solver.

Definition at line 596 of file petsc_solver.h.

Constructor & Destructor Documentation

SolverCGS()

PETScWrappers::SolverCGS::SolverCGS	(	SolverControl &	cn,
		const MPI_Comm &	mpi_communicator = PETSC_COMM_SELF,
		const AdditionalData &	data = AdditionalData()
	)

Constructor. In contrast to deal.II's own solvers, there is no need to give a vector memory object. However, PETSc solvers want to have an MPI communicator context over which computations are parallelized. By default, PETSC_COMM_SELF is used here, but you can change this. Note that for single processor (non-MPI) versions, this parameter does not have any effect.

The last argument takes a structure with additional, solver dependent flags for tuning.

Note that the communicator used here must match the communicator used in the system matrix, solution, and right hand side object of the solve to be done with this solver. Otherwise, PETSc will generate hard to track down errors, see the documentation of the SolverBase class.

Definition at line 472 of file petsc_solver.cc.

Member Function Documentation

set_solver_type()

void PETScWrappers::SolverCGS::set_solver_type ( KSP &  ksp ) const

overrideprotectedvirtual

Function that takes a Krylov Subspace Solver context object, and sets the type of solver that is appropriate for this class.

Implements PETScWrappers::SolverBase.

Definition at line 481 of file petsc_solver.cc.

solve()

void SolverBase< VectorType >::solve ( const MatrixBase &  A, VectorBase &  x, const VectorBase &  b, const PreconditionBase &  preconditioner  )

inherited

Solve the linear system Ax=b. Depending on the information provided by derived classes and the object passed as a preconditioner, one of the linear solvers and preconditioners of PETSc is chosen. Repeated calls to solve() do not reconstruct the preconditioner for performance reasons. See class Documentation.

Definition at line 53 of file petsc_solver.cc.

reset()

void SolverBase< VectorType >::reset ( )

virtualinherited

Resets the contained preconditioner and solver object. See class description for more details.

Definition at line 161 of file petsc_solver.cc.

set_prefix()

void SolverBase< VectorType >::set_prefix ( const std::string &  prefix )

inherited

Sets a prefix name for the solver object. Useful when customizing the PETSc KSP object with command-line options.

Definition at line 154 of file petsc_solver.cc.

control()

SolverControl & SolverBase< VectorType >::control ( ) const

inherited

Access to object that controls convergence.

Definition at line 168 of file petsc_solver.cc.

initialize()

void SolverBase< VectorType >::initialize ( const PreconditionBase &  preconditioner )

inherited

initialize the solver with the preconditioner. This function is intended for use with SLEPc spectral transformation class.

Definition at line 213 of file petsc_solver.cc.

convergence_test()

int SolverBase< VectorType >::convergence_test ( KSP  ksp, const PetscInt  iteration, const PetscReal  residual_norm, KSPConvergedReason *  reason, void *  solver_control  )

staticprivateinherited

A function that is used in PETSc as a callback to check on convergence. It takes the information provided from PETSc and checks it against deal.II's own SolverControl objects to see if convergence has been reached.

Definition at line 175 of file petsc_solver.cc.

Member Data Documentation

additional_data

const AdditionalData PETScWrappers::SolverCGS::additional_data

protected

Store a copy of the flags for this particular solver.

Definition at line 629 of file petsc_solver.h.

solver_control

SolverControl& PETScWrappers::SolverBase::solver_control

protectedinherited

Reference to the object that controls convergence of the iterative solver. In fact, for these PETSc wrappers, PETSc does so itself, but we copy the data from this object before starting the solution process, and copy the data back into it afterwards.

Definition at line 181 of file petsc_solver.h.

mpi_communicator

const MPI_Comm PETScWrappers::SolverBase::mpi_communicator

protectedinherited

Copy of the MPI communicator object to be used for the solver.

Definition at line 186 of file petsc_solver.h.

prefix_name

std::string PETScWrappers::SolverBase::prefix_name

protectedinherited

Solver prefix name to qualify options specific to the PETSc KSP object in the current context. Note: A hyphen (-) must NOT be given at the beginning of the prefix name. The first character of all runtime options is AUTOMATICALLY the hyphen.

Definition at line 201 of file petsc_solver.h.

solver_data

std::unique_ptr<SolverData> PETScWrappers::SolverBase::solver_data

privateinherited

Pointer to an object that stores the solver context. This is recreated in the main solver routine if necessary.

Definition at line 251 of file petsc_solver.h.

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The documentation for this class was generated from the following files:

• include/deal.II/lac/petsc_solver.h
• source/lac/petsc_solver.cc