Reference documentation for deal.II version 9.2.0
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Classes | Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
PETScWrappers::SolverPreOnly Class Reference

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

Inheritance diagram for PETScWrappers::SolverPreOnly:


struct  AdditionalData

Public Member Functions

 SolverPreOnly (SolverControl &cn, const MPI_Comm &mpi_communicator=PETSC_COMM_SELF, const AdditionalData &data=AdditionalData())
- Public Member Functions inherited from PETScWrappers::SolverBase
 SolverBase (SolverControl &cn, const MPI_Comm &mpi_communicator)
virtual ~SolverBase ()=default
void solve (const MatrixBase &A, VectorBase &x, const VectorBase &b, const PreconditionerBase &preconditioner)
virtual void reset ()
void set_prefix (const std::string &prefix)
SolverControlcontrol () const
void initialize (const PreconditionerBase &preconditioner)

Protected Member Functions

virtual void set_solver_type (KSP &ksp) const override

Protected Attributes

const AdditionalData additional_data
- Protected Attributes inherited from PETScWrappers::SolverBase
const MPI_Comm mpi_communicator
std::string prefix_name

Detailed Description

An implementation of the solver interface using the PETSc PREONLY solver. Actually this is NOT a real solution algorithm. solve() only applies the preconditioner once and returns immediately. Its only purpose is to provide a solver object, when the preconditioner should be used as a real solver. It is very useful in conjunction with the complete LU decomposition preconditioner PreconditionLU , which in conjunction with this solver class becomes a direct solver.

Wolfgang Bangerth, 2004, Oliver Kayser-Herold, 2004

Definition at line 870 of file petsc_solver.h.

Constructor & Destructor Documentation

◆ SolverPreOnly()

PETScWrappers::SolverPreOnly::SolverPreOnly ( 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 592 of file

Member Function Documentation

◆ set_solver_type()

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

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 601 of file

Member Data Documentation

◆ additional_data

const AdditionalData PETScWrappers::SolverPreOnly::additional_data

Store a copy of the flags for this particular solver.

Definition at line 903 of file petsc_solver.h.

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