PETScWrappers::SparseDirectMUMPS Class Reference

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

Inheritance diagram for PETScWrappers::SparseDirectMUMPS:

Classes
struct	AdditionalData
struct	SolverDataMUMPS

Public Member Functions
	SparseDirectMUMPS (SolverControl &cn, const MPI_Comm &mpi_communicator=PETSC_COMM_SELF, const AdditionalData &data=AdditionalData())
void	solve (const MatrixBase &A, VectorBase &x, const VectorBase &b)
void	set_symmetric_mode (const bool flag)
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)
SolverControl &	control () 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
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
bool	symmetric_mode

Detailed Description

An implementation of the solver interface using the sparse direct MUMPS solver through PETSc. This class has the usual interface of all other solver classes but it is of course different in that it doesn't implement an iterative solver. As a consequence, things like the SolverControl object have no particular meaning here.

MUMPS allows to make use of symmetry in this matrix. In this class this is made possible by the set_symmetric_mode() function. If your matrix is symmetric, you can use this class as follows:

SolverControl cn;
PETScWrappers::SparseDirectMUMPS solver(cn, mpi_communicator);
solver.set_symmetric_mode(true);
solver.solve(system_matrix, solution, system_rhs);

Note

The class internally calls KSPSetFromOptions thus you are able to use all the PETSc parameters for MATSOLVERMUMPS package. See http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MATSOLVERMUMPS.html

Author

Daniel Brauss, Alexander Grayver, 2012

Definition at line 934 of file petsc_solver.h.

Constructor & Destructor Documentation

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

Constructor

Definition at line 634 of file petsc_solver.cc.

Member Function Documentation

void PETScWrappers::SparseDirectMUMPS::solve	(	const MatrixBase &	A,
		VectorBase &	x,
		const VectorBase &	b
	)

The method to solve the linear system.

Definition at line 671 of file petsc_solver.cc.

void PETScWrappers::SparseDirectMUMPS::set_symmetric_mode

(

const bool

flag

)

The method allows to take advantage if the system matrix is symmetric by using LDL^T decomposition instead of more expensive LU. The argument indicates whether the matrix is symmetric or not.

Definition at line 884 of file petsc_solver.cc.

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

overrideprotectedvirtual

Function that takes a Krylov Subspace Solver context object, and sets the type of solver that is requested by the derived class.

KSPPREONLY implements a stub method that applies only the preconditioner. Its use is due to SparseDirectMUMPS being a direct (rather than iterative) solver

The KSPPREONLY solver of PETSc never calls the convergence monitor, which leads to failure even when everything was ok. Therefore, the SolverControl status is set to some nice values, which guarantee a nice result at the end of the solution process.

Using a PREONLY solver with a nonzero initial guess leads PETSc to produce some error messages.

Implements PETScWrappers::SolverBase.

Definition at line 644 of file petsc_solver.cc.

PetscErrorCode PETScWrappers::SparseDirectMUMPS::convergence_test ( KSP  ksp, const PetscInt  iteration, const PetscReal  residual_norm, KSPConvergedReason *  reason, void *  solver_control  )

staticprivate

A function that is used in PETSc as a callback to check 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 847 of file petsc_solver.cc.

Member Data Documentation

const AdditionalData PETScWrappers::SparseDirectMUMPS::additional_data

protected

Store a copy of flags for this particular solver.

Definition at line 967 of file petsc_solver.h.

bool PETScWrappers::SparseDirectMUMPS::symmetric_mode

private

Flag specifies whether matrix being factorized is symmetric or not. It influences the type of the used preconditioner (PCLU or PCCHOLESKY)

Definition at line 1008 of file petsc_solver.h.

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

• deal.II/lac/petsc_solver.h
• /mnt/data/darndt/Sources/dealii-clang-6.0.0/source/lac/petsc_solver.cc