libMesh::PetscLinearSolver< T > Class Template Reference

This class provides an interface to PETSc iterative solvers that is compatible with the libMesh LinearSolver<> More...

#include <petsc_linear_solver.h>

Inheritance diagram for libMesh::PetscLinearSolver< T >:

Public Member Functions
	PetscLinearSolver (const libMesh::Parallel::Communicator &comm_in)
	Constructor. More...
	~PetscLinearSolver ()
	Destructor. More...
virtual void	clear () override
	Release all memory and clear data structures. More...
virtual void	init (const char *name=nullptr) override
	Initialize data structures if not done so already. More...
void	init (PetscMatrix< T > *matrix, const char *name=nullptr)
	Initialize data structures if not done so already plus much more. More...
virtual void	init_names (const System &) override
	Apply names to the system to be solved. More...
virtual void	restrict_solve_to (const std::vector< unsigned int > *const dofs, const SubsetSolveMode subset_solve_mode=SUBSET_ZERO) override
	After calling this method, all successive solves will be restricted to the given set of dofs, which must contain local dofs on each processor only and not contain any duplicates. More...
virtual std::pair< unsigned int, Real >	solve (SparseMatrix< T > &matrix_in, NumericVector< T > &solution_in, NumericVector< T > &rhs_in, const double tol, const unsigned int m_its) override
	Call the Petsc solver. More...
virtual std::pair< unsigned int, Real >	adjoint_solve (SparseMatrix< T > &matrix_in, NumericVector< T > &solution_in, NumericVector< T > &rhs_in, const double tol, const unsigned int m_its) override
	Call the Petsc solver. More...
virtual std::pair< unsigned int, Real >	solve (SparseMatrix< T > &matrix, SparseMatrix< T > &preconditioner, NumericVector< T > &solution, NumericVector< T > &rhs, const double tol, const unsigned int m_its) override
	This method allows you to call a linear solver while specifying the matrix to use as the (left) preconditioning matrix. More...
virtual std::pair< unsigned int, Real >	solve (const ShellMatrix< T > &shell_matrix, NumericVector< T > &solution_in, NumericVector< T > &rhs_in, const double tol, const unsigned int m_its) override
	This function solves a system whose matrix is a shell matrix. More...
virtual std::pair< unsigned int, Real >	solve (const ShellMatrix< T > &shell_matrix, const SparseMatrix< T > &precond_matrix, NumericVector< T > &solution_in, NumericVector< T > &rhs_in, const double tol, const unsigned int m_its) override
	This function solves a system whose matrix is a shell matrix, but a sparse matrix is used as preconditioning matrix, this allowing other preconditioners than JACOBI. More...
PC	pc ()
KSP	ksp ()
void	get_residual_history (std::vector< double > &hist)
	Fills the input vector with the sequence of residual norms from the latest iterative solve. More...
Real	get_initial_residual ()
virtual LinearConvergenceReason	get_converged_reason () const override
bool	initialized () const
SolverType	solver_type () const
void	set_solver_type (const SolverType st)
	Sets the type of solver to use. More...
PreconditionerType	preconditioner_type () const
void	set_preconditioner_type (const PreconditionerType pct)
	Sets the type of preconditioner to use. More...
void	attach_preconditioner (Preconditioner< T > *preconditioner)
	Attaches a Preconditioner object to be used. More...
virtual void	reuse_preconditioner (bool)
	Set the same_preconditioner flag, which indicates if we reuse the same preconditioner for subsequent solves. More...
bool	get_same_preconditioner ()
std::pair< unsigned int, Real >	solve (SparseMatrix< T > &matrix, SparseMatrix< T > *precond_matrix, NumericVector< T > &, NumericVector< T > &, const double, const unsigned int)
	This function calls the solver "_solver_type" preconditioned with the "_preconditioner_type" preconditioner. More...
std::pair< unsigned int, Real >	solve (const ShellMatrix< T > &matrix, const SparseMatrix< T > *precond_matrix, NumericVector< T > &, NumericVector< T > &, const double, const unsigned int)
	This function solves a system whose matrix is a shell matrix, but an optional sparse matrix may be used as preconditioning matrix. More...
virtual void	print_converged_reason () const
	Prints a useful message about why the latest linear solve con(di)verged. More...
void	set_solver_configuration (SolverConfiguration &solver_configuration)
	Set the solver configuration object. More...
const Parallel::Communicator &	comm () const
processor_id_type	n_processors () const
processor_id_type	processor_id () const

Static Public Member Functions
static std::unique_ptr< LinearSolver< T > >	build (const libMesh::Parallel::Communicator &comm_in, const SolverPackage solver_package=libMesh::default_solver_package())
	Builds a LinearSolver using the linear solver package specified by solver_package. More...
static std::string	get_info ()
	Gets a string containing the reference information. More...
static void	print_info (std::ostream &out=libMesh::out)
	Prints the reference information, by default to libMesh::out. More...
static unsigned int	n_objects ()
	Prints the number of outstanding (created, but not yet destroyed) objects. More...
static void	enable_print_counter_info ()
	Methods to enable/disable the reference counter output from print_info() More...
static void	disable_print_counter_info ()

Protected Types
typedef std::map< std::string, std::pair< unsigned int, unsigned int > >	Counts
	Data structure to log the information. More...

Protected Member Functions
void	increment_constructor_count (const std::string &name)
	Increments the construction counter. More...
void	increment_destructor_count (const std::string &name)
	Increments the destruction counter. More...

Protected Attributes
SolverType	_solver_type
	Enum stating which type of iterative solver to use. More...
PreconditionerType	_preconditioner_type
	Enum stating with type of preconditioner to use. More...
bool	_is_initialized
	Flag indicating if the data structures have been initialized. More...
Preconditioner< T > *	_preconditioner
	Holds the Preconditioner object to be used for the linear solves. More...
bool	same_preconditioner
	Boolean flag to indicate whether we want to use an identical preconditioner to the previous solve. More...
SolverConfiguration *	_solver_configuration
	Optionally store a SolverOptions object that can be used to set parameters like solver type, tolerances and iteration limits. More...
const Parallel::Communicator &	_communicator

Static Protected Attributes
static Counts	_counts
	Actually holds the data. More...
static Threads::atomic< unsigned int >	_n_objects
	The number of objects. More...
static Threads::spin_mutex	_mutex
	Mutual exclusion object to enable thread-safe reference counting. More...
static bool	_enable_print_counter
	Flag to control whether reference count information is printed when print_info is called. More...

Private Member Functions
void	set_petsc_solver_type ()
	Tells PETSC to use the user-specified solver stored in _solver_type. More...
PetscInt	_restrict_solve_to_is_local_size () const
void	_create_complement_is (const NumericVector< T > &vec_in)
	Creates _restrict_solve_to_is_complement to contain all indices that are local in vec_in, except those that are contained in _restrict_solve_to_is. More...

Static Private Member Functions
static PetscErrorCode	_petsc_shell_matrix_mult (Mat mat, Vec arg, Vec dest)
	Internal function if shell matrix mode is used. More...
static PetscErrorCode	_petsc_shell_matrix_mult_add (Mat mat, Vec arg, Vec add, Vec dest)
	Internal function if shell matrix mode is used. More...
static PetscErrorCode	_petsc_shell_matrix_get_diagonal (Mat mat, Vec dest)
	Internal function if shell matrix mode is used. More...

Private Attributes
PC	_pc
	Preconditioner context. More...
KSP	_ksp
	Krylov subspace context. More...
IS	_restrict_solve_to_is
	PETSc index set containing the dofs on which to solve (nullptr means solve on all dofs). More...
IS	_restrict_solve_to_is_complement
	PETSc index set, complement to _restrict_solve_to_is. More...
SubsetSolveMode	_subset_solve_mode
	If restrict-solve-to-subset mode is active, this member decides what happens with the dofs outside the subset. More...

Detailed Description

template<typename T>
class libMesh::PetscLinearSolver< T >

This class provides an interface to PETSc iterative solvers that is compatible with the libMesh LinearSolver<>

Author

Benjamin Kirk

Date

2002-2007

Definition at line 101 of file petsc_linear_solver.h.

Member Typedef Documentation

Counts

typedef std::map<std::string, std::pair<unsigned int, unsigned int> > libMesh::ReferenceCounter::Counts

protectedinherited

Data structure to log the information.

The log is identified by the class name.

Definition at line 117 of file reference_counter.h.

Constructor & Destructor Documentation

PetscLinearSolver()

template<typename T >

libMesh::PetscLinearSolver< T >::PetscLinearSolver

(

const libMesh::Parallel::Communicator &

comm_in

)

Constructor.

Initializes Petsc data structures

~PetscLinearSolver()

template<typename T >

libMesh::PetscLinearSolver< T >::~PetscLinearSolver

(

)

Destructor.

Definition at line 331 of file petsc_linear_solver.h.

{
  this->clear ();
}

Member Function Documentation

_create_complement_is()

template<typename T >

void libMesh::PetscLinearSolver< T >::_create_complement_is ( const NumericVector< T > &  vec_in )

private

Creates _restrict_solve_to_is_complement to contain all indices that are local in vec_in, except those that are contained in _restrict_solve_to_is.

Definition at line 355 of file petsc_linear_solver.h.

{
  libmesh_assert(_restrict_solve_to_is);
#if PETSC_VERSION_LESS_THAN(3,0,0)
  // No ISComplement in PETSc 2.3.3
  libmesh_not_implemented();
#else
  if (_restrict_solve_to_is_complement==nullptr)
    {
      int ierr = ISComplement(_restrict_solve_to_is,
                              vec_in.first_local_index(),
                              vec_in.last_local_index(),
                              &_restrict_solve_to_is_complement);
      LIBMESH_CHKERR(ierr);
    }
#endif
}

_petsc_shell_matrix_get_diagonal()

template<typename T >

static PetscErrorCode libMesh::PetscLinearSolver< T >::_petsc_shell_matrix_get_diagonal ( Mat  mat, Vec  dest  )

staticprivate

Internal function if shell matrix mode is used.

_petsc_shell_matrix_mult()

template<typename T >

static PetscErrorCode libMesh::PetscLinearSolver< T >::_petsc_shell_matrix_mult ( Mat  mat, Vec  arg, Vec  dest  )

staticprivate

Internal function if shell matrix mode is used.

_petsc_shell_matrix_mult_add()

template<typename T >

static PetscErrorCode libMesh::PetscLinearSolver< T >::_petsc_shell_matrix_mult_add ( Mat  mat, Vec  arg, Vec  add, Vec  dest  )

staticprivate

Internal function if shell matrix mode is used.

_restrict_solve_to_is_local_size()

template<typename T >

PetscInt libMesh::PetscLinearSolver< T >::_restrict_solve_to_is_local_size ( ) const

private

Returns

The local size of _restrict_solve_to_is.

Definition at line 340 of file petsc_linear_solver.h.

{
  libmesh_assert(_restrict_solve_to_is);

  PetscInt s;
  int ierr = ISGetLocalSize(_restrict_solve_to_is, &s);
  LIBMESH_CHKERR(ierr);

  return s;
}

adjoint_solve()

template<typename T >

virtual std::pair<unsigned int, Real> libMesh::PetscLinearSolver< T >::adjoint_solve ( SparseMatrix< T > &  matrix_in, NumericVector< T > &  solution_in, NumericVector< T > &  rhs_in, const double  tol, const unsigned int  m_its  )

overridevirtual

Call the Petsc solver.

It calls the method below, using the same matrix for the system and preconditioner matrices.

Reimplemented from libMesh::LinearSolver< T >.

attach_preconditioner()

template<typename T>

void libMesh::LinearSolver< T >::attach_preconditioner ( Preconditioner< T > *  preconditioner )

inherited

Attaches a Preconditioner object to be used.

build()

template<typename T>

static std::unique_ptr<LinearSolver<T> > libMesh::LinearSolver< T >::build ( const libMesh::Parallel::Communicator &  comm_in, const SolverPackage  solver_package = libMesh::default_solver_package()  )

staticinherited

Builds a LinearSolver using the linear solver package specified by solver_package.

clear()

template<typename T >

virtual void libMesh::PetscLinearSolver< T >::clear ( )

overridevirtual

Release all memory and clear data structures.

Reimplemented from libMesh::LinearSolver< T >.

comm()

const Parallel::Communicator& libMesh::ParallelObject::comm ( ) const

inherited

Returns

A reference to the Parallel::Communicator object used by this mesh.

Definition at line 87 of file parallel_object.h.

References libMesh::ParallelObject::_communicator.

Referenced by libMesh::EpetraVector< T >::EpetraVector(), libMesh::Parallel::sync_element_data_by_parent_id(), libMesh::Parallel::sync_node_data_by_element_id(), and libMesh::Parallel::sync_node_data_by_element_id_once().

  { return _communicator; }

disable_print_counter_info()

static void libMesh::ReferenceCounter::disable_print_counter_info ( )

staticinherited

enable_print_counter_info()

static void libMesh::ReferenceCounter::enable_print_counter_info ( )

staticinherited

Methods to enable/disable the reference counter output from print_info()

get_converged_reason()

template<typename T >

virtual LinearConvergenceReason libMesh::PetscLinearSolver< T >::get_converged_reason ( ) const

overridevirtual

Returns

The solver's convergence flag

Implements libMesh::LinearSolver< T >.

get_info()

static std::string libMesh::ReferenceCounter::get_info ( )

staticinherited

Gets a string containing the reference information.

get_initial_residual()

template<typename T >

Real libMesh::PetscLinearSolver< T >::get_initial_residual

(

)

Returns

Just the initial residual for the solve just completed with this interface.

Use this method instead of the one above if you just want the starting residual and not the entire history.

get_residual_history()

template<typename T >

void libMesh::PetscLinearSolver< T >::get_residual_history

(

std::vector< double > &

hist

)

Fills the input vector with the sequence of residual norms from the latest iterative solve.

get_same_preconditioner()

template<typename T >

bool libMesh::LinearSolver< T >::get_same_preconditioner ( )

inherited

Returns

same_preconditioner, which indicates if we reuse the same preconditioner for subsequent solves.

Definition at line 322 of file linear_solver.h.

{
  return same_preconditioner;
}

increment_constructor_count()

void libMesh::ReferenceCounter::increment_constructor_count ( const std::string &  name )

protectedinherited

Increments the construction counter.

Should be called in the constructor of any derived class that will be reference counted.

Definition at line 181 of file reference_counter.h.

References libMesh::ReferenceCounter::_counts, libMesh::Quality::name(), and libMesh::Threads::spin_mtx.

Referenced by libMesh::ReferenceCountedObject< RBParametrized >::ReferenceCountedObject().

{
  Threads::spin_mutex::scoped_lock lock(Threads::spin_mtx);
  std::pair<unsigned int, unsigned int> & p = _counts[name];

  p.first++;
}

increment_destructor_count()

void libMesh::ReferenceCounter::increment_destructor_count ( const std::string &  name )

protectedinherited

Increments the destruction counter.

Should be called in the destructor of any derived class that will be reference counted.

Definition at line 194 of file reference_counter.h.

References libMesh::ReferenceCounter::_counts, libMesh::Quality::name(), and libMesh::Threads::spin_mtx.

Referenced by libMesh::ReferenceCountedObject< RBParametrized >::~ReferenceCountedObject().

{
  Threads::spin_mutex::scoped_lock lock(Threads::spin_mtx);
  std::pair<unsigned int, unsigned int> & p = _counts[name];

  p.second++;
}

init() [1/2]

template<typename T >

virtual void libMesh::PetscLinearSolver< T >::init ( const char *  name = nullptr )

overridevirtual

Initialize data structures if not done so already.

Assigns a name, which is turned into an underscore-separated prefix for the underlying KSP object.

Implements libMesh::LinearSolver< T >.

Referenced by libMesh::PetscLinearSolver< T >::ksp(), and libMesh::PetscLinearSolver< T >::pc().

init() [2/2]

template<typename T >

void libMesh::PetscLinearSolver< T >::init	(	PetscMatrix< T > *	matrix,
		const char *	name = nullptr
	)

Initialize data structures if not done so already plus much more.

init_names()

template<typename T >

virtual void libMesh::PetscLinearSolver< T >::init_names ( const System &  )

overridevirtual

Apply names to the system to be solved.

This sets an option prefix from the system name and sets field names from the system's variable names.

Since field names are applied to DoF numberings, this method must be called again after any System reinit.

Reimplemented from libMesh::LinearSolver< T >.

initialized()

template<typename T>

bool libMesh::LinearSolver< T >::initialized ( ) const

inherited

Returns

true if the data structures are initialized, false otherwise.

Definition at line 96 of file linear_solver.h.

{ return _is_initialized; }

ksp()

template<typename T >

KSP libMesh::PetscLinearSolver< T >::ksp

(

)

Returns

The raw PETSc ksp context pointer.

This is useful if you are for example setting a custom convergence test with KSPSetConvergenceTest().

Definition at line 240 of file petsc_linear_solver.h.

References libMesh::PetscLinearSolver< T >::_ksp, and libMesh::PetscLinearSolver< T >::init().

{ this->init(); return _ksp; }

n_objects()

static unsigned int libMesh::ReferenceCounter::n_objects ( )

staticinherited

Prints the number of outstanding (created, but not yet destroyed) objects.

Definition at line 83 of file reference_counter.h.

References libMesh::ReferenceCounter::_n_objects.

  { return _n_objects; }

n_processors()

processor_id_type libMesh::ParallelObject::n_processors ( ) const

inherited

Returns

The number of processors in the group.

Definition at line 93 of file parallel_object.h.

References libMesh::ParallelObject::_communicator, and libMesh::Parallel::Communicator::size().

Referenced by libMesh::MeshBase::partition().

  { return cast_int<processor_id_type>(_communicator.size()); }

pc()

template<typename T >

PC libMesh::PetscLinearSolver< T >::pc

(

)

Returns

The raw PETSc preconditioner context pointer.

This allows you to specify the PCShellSetApply() and PCShellSetSetUp() functions if you desire. Just don't do anything crazy like calling libMeshPCDestroy() on the pointer!

Definition at line 232 of file petsc_linear_solver.h.

References libMesh::PetscLinearSolver< T >::_pc, and libMesh::PetscLinearSolver< T >::init().

{ this->init(); return _pc; }

preconditioner_type()

template<typename T>

PreconditionerType libMesh::LinearSolver< T >::preconditioner_type ( ) const

inherited

Returns

The type of preconditioner to use.

print_converged_reason()

template<typename T>

virtual void libMesh::LinearSolver< T >::print_converged_reason ( ) const

virtualinherited

Prints a useful message about why the latest linear solve con(di)verged.

Reimplemented in libMesh::AztecLinearSolver< T >, and libMesh::LaspackLinearSolver< T >.

print_info()

static void libMesh::ReferenceCounter::print_info ( std::ostream &  out = libMesh::out )

staticinherited

Prints the reference information, by default to libMesh::out.

processor_id()

processor_id_type libMesh::ParallelObject::processor_id ( ) const

inherited

Returns

The rank of this processor in the group.

Definition at line 99 of file parallel_object.h.

References libMesh::ParallelObject::_communicator, and libMesh::Parallel::Communicator::rank().

Referenced by libMesh::DofMap::end_dof(), libMesh::DofMap::end_old_dof(), libMesh::DofMap::first_dof(), libMesh::DofMap::first_old_dof(), libMesh::DofMap::last_dof(), libMesh::MeshBase::n_active_local_elem(), libMesh::DofMap::n_local_dofs(), libMesh::MeshBase::n_local_elem(), libMesh::MeshBase::n_local_nodes(), and libMesh::MeshTools::weight().

  { return cast_int<processor_id_type>(_communicator.rank()); }

restrict_solve_to()

template<typename T >

virtual void libMesh::PetscLinearSolver< T >::restrict_solve_to ( const std::vector< unsigned int > *const  dofs, const SubsetSolveMode  subset_solve_mode = SUBSET_ZERO  )

overridevirtual

After calling this method, all successive solves will be restricted to the given set of dofs, which must contain local dofs on each processor only and not contain any duplicates.

This mode can be disabled by calling this method with dofs being a nullptr.

Reimplemented from libMesh::LinearSolver< T >.

reuse_preconditioner()

template<typename T>

virtual void libMesh::LinearSolver< T >::reuse_preconditioner ( bool  )

virtualinherited

Set the same_preconditioner flag, which indicates if we reuse the same preconditioner for subsequent solves.

set_petsc_solver_type()

template<typename T >

void libMesh::PetscLinearSolver< T >::set_petsc_solver_type ( )

private

Tells PETSC to use the user-specified solver stored in _solver_type.

set_preconditioner_type()

template<typename T>

void libMesh::LinearSolver< T >::set_preconditioner_type ( const PreconditionerType  pct )

inherited

Sets the type of preconditioner to use.

set_solver_configuration()

template<typename T>

void libMesh::LinearSolver< T >::set_solver_configuration ( SolverConfiguration &  solver_configuration )

inherited

Set the solver configuration object.

set_solver_type()

template<typename T>

void libMesh::LinearSolver< T >::set_solver_type ( const SolverType  st )

inherited

Sets the type of solver to use.

Definition at line 127 of file linear_solver.h.

  { _solver_type = st; }

solve() [1/6]

template<typename T >

virtual std::pair<unsigned int, Real> libMesh::PetscLinearSolver< T >::solve ( SparseMatrix< T > &  matrix_in, NumericVector< T > &  solution_in, NumericVector< T > &  rhs_in, const double  tol, const unsigned int  m_its  )

overridevirtual

Call the Petsc solver.

It calls the method below, using the same matrix for the system and preconditioner matrices.

Implements libMesh::LinearSolver< T >.

Definition at line 157 of file petsc_linear_solver.h.

  {
    return this->solve(matrix_in, matrix_in, solution_in, rhs_in, tol, m_its);
  }

solve() [2/6]

template<typename T >

virtual std::pair<unsigned int, Real> libMesh::PetscLinearSolver< T >::solve ( SparseMatrix< T > &  matrix, SparseMatrix< T > &  preconditioner, NumericVector< T > &  solution, NumericVector< T > &  rhs, const double  tol, const unsigned int  m_its  )

overridevirtual

This method allows you to call a linear solver while specifying the matrix to use as the (left) preconditioning matrix.

Note

The linear solver will not compute a preconditioner in this case, and will instead premultiply by the matrix you provide. In PETSc, this is accomplished by calling

PCSetType(_pc, PCMAT);

before invoking KSPSolve().

This functionality is not implemented in the LinearSolver class since there is not a built-in analog to this method for LASPACK. You could probably implement it by hand if you wanted.

Implements libMesh::LinearSolver< T >.

solve() [3/6]

template<typename T >

virtual std::pair<unsigned int, Real> libMesh::PetscLinearSolver< T >::solve ( const ShellMatrix< T > &  shell_matrix, NumericVector< T > &  solution_in, NumericVector< T > &  rhs_in, const double  tol, const unsigned int  m_its  )

overridevirtual

This function solves a system whose matrix is a shell matrix.

Implements libMesh::LinearSolver< T >.

solve() [4/6]

template<typename T>

std::pair< unsigned int, Real > libMesh::LinearSolver< T >::solve ( SparseMatrix< T > &  matrix, SparseMatrix< T > *  precond_matrix, NumericVector< T > &  sol, NumericVector< T > &  rhs, const double  tol, const unsigned int  n_iter  )

inherited

This function calls the solver "_solver_type" preconditioned with the "_preconditioner_type" preconditioner.

The preconditioning matrix is used if it is provided, or the system matrix is used if precond_matrix is null

Definition at line 330 of file linear_solver.h.

{
  if (pc_mat)
    return this->solve(mat, *pc_mat, sol, rhs, tol, n_iter);
  else
    return this->solve(mat, sol, rhs, tol, n_iter);
}

solve() [5/6]

template<typename T >

virtual std::pair<unsigned int, Real> libMesh::PetscLinearSolver< T >::solve ( const ShellMatrix< T > &  shell_matrix, const SparseMatrix< T > &  precond_matrix, NumericVector< T > &  solution_in, NumericVector< T > &  rhs_in, const double  tol, const unsigned int  m_its  )

overridevirtual

This function solves a system whose matrix is a shell matrix, but a sparse matrix is used as preconditioning matrix, this allowing other preconditioners than JACOBI.

Implements libMesh::LinearSolver< T >.

solve() [6/6]

template<typename T>

std::pair< unsigned int, Real > libMesh::LinearSolver< T >::solve ( const ShellMatrix< T > &  matrix, const SparseMatrix< T > *  precond_matrix, NumericVector< T > &  sol, NumericVector< T > &  rhs, const double  tol, const unsigned int  n_iter  )

inherited

This function solves a system whose matrix is a shell matrix, but an optional sparse matrix may be used as preconditioning matrix.

Definition at line 347 of file linear_solver.h.

{
  if (pc_mat)
    return this->solve(mat, *pc_mat, sol, rhs, tol, n_iter);
  else
    return this->solve(mat, sol, rhs, tol, n_iter);
}

solver_type()

template<typename T>

SolverType libMesh::LinearSolver< T >::solver_type ( ) const

inherited

Returns

The type of solver to use.

Definition at line 122 of file linear_solver.h.

{ return _solver_type; }

Member Data Documentation

_communicator

const Parallel::Communicator& libMesh::ParallelObject::_communicator

protectedinherited

Definition at line 105 of file parallel_object.h.

Referenced by libMesh::ParallelObject::comm(), libMesh::ParallelObject::n_processors(), libMesh::ParallelObject::operator=(), and libMesh::ParallelObject::processor_id().

_counts

Counts libMesh::ReferenceCounter::_counts

staticprotectedinherited

Actually holds the data.

Definition at line 122 of file reference_counter.h.

Referenced by libMesh::ReferenceCounter::increment_constructor_count(), and libMesh::ReferenceCounter::increment_destructor_count().

_enable_print_counter

bool libMesh::ReferenceCounter::_enable_print_counter

staticprotectedinherited

Flag to control whether reference count information is printed when print_info is called.

Definition at line 141 of file reference_counter.h.

_is_initialized

template<typename T>

bool libMesh::LinearSolver< T >::_is_initialized

protectedinherited

Flag indicating if the data structures have been initialized.

Definition at line 287 of file linear_solver.h.

Referenced by libMesh::LinearSolver< Number >::initialized().

_ksp

template<typename T >

KSP libMesh::PetscLinearSolver< T >::_ksp

private

Krylov subspace context.

Definition at line 293 of file petsc_linear_solver.h.

Referenced by libMesh::PetscLinearSolver< T >::ksp().

_mutex

Threads::spin_mutex libMesh::ReferenceCounter::_mutex

staticprotectedinherited

Mutual exclusion object to enable thread-safe reference counting.

Definition at line 135 of file reference_counter.h.

_n_objects

Threads::atomic<unsigned int> libMesh::ReferenceCounter::_n_objects

staticprotectedinherited

The number of objects.

Print the reference count information when the number returns to 0.

Definition at line 130 of file reference_counter.h.

Referenced by libMesh::ReferenceCounter::n_objects(), libMesh::ReferenceCounter::ReferenceCounter(), and libMesh::ReferenceCounter::~ReferenceCounter().

_pc

template<typename T >

PC libMesh::PetscLinearSolver< T >::_pc

private

Preconditioner context.

Definition at line 288 of file petsc_linear_solver.h.

Referenced by libMesh::PetscLinearSolver< T >::pc().

_preconditioner

template<typename T>

Preconditioner<T>* libMesh::LinearSolver< T >::_preconditioner

protectedinherited

Holds the Preconditioner object to be used for the linear solves.

Definition at line 292 of file linear_solver.h.

_preconditioner_type

template<typename T>

PreconditionerType libMesh::LinearSolver< T >::_preconditioner_type

protectedinherited

Enum stating with type of preconditioner to use.

Definition at line 282 of file linear_solver.h.

_restrict_solve_to_is

template<typename T >

IS libMesh::PetscLinearSolver< T >::_restrict_solve_to_is

private

PETSc index set containing the dofs on which to solve (nullptr means solve on all dofs).

Definition at line 299 of file petsc_linear_solver.h.

_restrict_solve_to_is_complement

template<typename T >

IS libMesh::PetscLinearSolver< T >::_restrict_solve_to_is_complement

private

PETSc index set, complement to _restrict_solve_to_is.

This will be created on demand by the method _create_complement_is().

Definition at line 306 of file petsc_linear_solver.h.

_solver_configuration

template<typename T>

SolverConfiguration* libMesh::LinearSolver< T >::_solver_configuration

protectedinherited

Optionally store a SolverOptions object that can be used to set parameters like solver type, tolerances and iteration limits.

Definition at line 306 of file linear_solver.h.

_solver_type

template<typename T>

SolverType libMesh::LinearSolver< T >::_solver_type

protectedinherited

Enum stating which type of iterative solver to use.

Definition at line 277 of file linear_solver.h.

Referenced by libMesh::LinearSolver< Number >::set_solver_type(), and libMesh::LinearSolver< Number >::solver_type().

_subset_solve_mode

template<typename T >

SubsetSolveMode libMesh::PetscLinearSolver< T >::_subset_solve_mode

private

If restrict-solve-to-subset mode is active, this member decides what happens with the dofs outside the subset.

Definition at line 324 of file petsc_linear_solver.h.

same_preconditioner

template<typename T>

bool libMesh::LinearSolver< T >::same_preconditioner

protectedinherited

Boolean flag to indicate whether we want to use an identical preconditioner to the previous solve.

This can save substantial work in the cases where the system matrix is the same for successive solves.

Definition at line 300 of file linear_solver.h.

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

• include/solvers/petsc_linear_solver.h