libMesh::SparsityPattern::Build Class Reference

This helper class can be called on multiple threads to compute the sparsity pattern (or graph) of the sparse matrix resulting from the discretization. More...

#include <sparsity_pattern.h>

Inheritance diagram for libMesh::SparsityPattern::Build:

Public Member Functions
	Build (const MeshBase &mesh_in, const DofMap &dof_map_in, const CouplingMatrix *dof_coupling_in, std::set< GhostingFunctor *> coupling_functors_in, const bool implicit_neighbor_dofs_in, const bool need_full_sparsity_pattern_in)
	Build (Build &other, Threads::split)
void	operator() (const ConstElemRange &range)
void	join (const Build &other)
void	parallel_sync ()
const Parallel::Communicator &	comm () const
processor_id_type	n_processors () const
processor_id_type	processor_id () const

Public Attributes
SparsityPattern::Graph	sparsity_pattern
SparsityPattern::NonlocalGraph	nonlocal_pattern
std::vector< dof_id_type >	n_nz
std::vector< dof_id_type >	n_oz

Protected Attributes
const Parallel::Communicator &	_communicator

Private Member Functions
void	handle_vi_vj (const std::vector< dof_id_type > &element_dofs_i, const std::vector< dof_id_type > &element_dofs_j)
void	sorted_connected_dofs (const Elem *elem, std::vector< dof_id_type > &dofs_vi, unsigned int vi)

Private Attributes
const MeshBase &	mesh
const DofMap &	dof_map
const CouplingMatrix *	dof_coupling
const std::set< GhostingFunctor * > &	coupling_functors
const bool	implicit_neighbor_dofs
const bool	need_full_sparsity_pattern

Detailed Description

This helper class can be called on multiple threads to compute the sparsity pattern (or graph) of the sparse matrix resulting from the discretization.

This pattern may be used directly by a particular sparse matrix format (e.g. LaspackMatrix) or indirectly (e.g. PetscMatrix). In the latter case the number of nonzeros per row of the matrix is needed for efficient preallocation. In this case it suffices to provide estimate (but bounding) values, and in this case the threaded method can take some short-cuts for efficiency.

Definition at line 80 of file sparsity_pattern.h.

Constructor & Destructor Documentation

Build() [1/2]

libMesh::SparsityPattern::Build::Build	(	const MeshBase &	mesh_in,
		const DofMap &	dof_map_in,
		const CouplingMatrix *	dof_coupling_in,
		std::set< GhostingFunctor *>	coupling_functors_in,
		const bool	implicit_neighbor_dofs_in,
		const bool	need_full_sparsity_pattern_in
	)

Build() [2/2]

libMesh::SparsityPattern::Build::Build	(	Build &	other,
		Threads::split
	)

Member Function Documentation

comm()

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

inherited

Returns

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

Definition at line 89 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; }

handle_vi_vj()

void libMesh::SparsityPattern::Build::handle_vi_vj ( const std::vector< dof_id_type > &  element_dofs_i, const std::vector< dof_id_type > &  element_dofs_j  )

private

join()

void libMesh::SparsityPattern::Build::join

(

const Build &

other

)

n_processors()

processor_id_type libMesh::ParallelObject::n_processors ( ) const

inherited

Returns

The number of processors in the group.

Definition at line 95 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()); }

operator()()

void libMesh::SparsityPattern::Build::operator()

(

const ConstElemRange &

range

)

parallel_sync()

void libMesh::SparsityPattern::Build::parallel_sync

(

)

processor_id()

processor_id_type libMesh::ParallelObject::processor_id ( ) const

inherited

Returns

The rank of this processor in the group.

Definition at line 101 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()); }

sorted_connected_dofs()

void libMesh::SparsityPattern::Build::sorted_connected_dofs ( const Elem *  elem, std::vector< dof_id_type > &  dofs_vi, unsigned int  vi  )

private

Member Data Documentation

_communicator

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

protectedinherited

Definition at line 107 of file parallel_object.h.

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

coupling_functors

const std::set<GhostingFunctor *>& libMesh::SparsityPattern::Build::coupling_functors

private

Definition at line 86 of file sparsity_pattern.h.

dof_coupling

const CouplingMatrix* libMesh::SparsityPattern::Build::dof_coupling

private

Definition at line 85 of file sparsity_pattern.h.

dof_map

const DofMap& libMesh::SparsityPattern::Build::dof_map

private

Definition at line 84 of file sparsity_pattern.h.

implicit_neighbor_dofs

const bool libMesh::SparsityPattern::Build::implicit_neighbor_dofs

private

Definition at line 87 of file sparsity_pattern.h.

mesh

const MeshBase& libMesh::SparsityPattern::Build::mesh

private

Definition at line 83 of file sparsity_pattern.h.

n_nz

std::vector<dof_id_type> libMesh::SparsityPattern::Build::n_nz

Definition at line 102 of file sparsity_pattern.h.

n_oz

std::vector<dof_id_type> libMesh::SparsityPattern::Build::n_oz

Definition at line 103 of file sparsity_pattern.h.

need_full_sparsity_pattern

const bool libMesh::SparsityPattern::Build::need_full_sparsity_pattern

private

Definition at line 88 of file sparsity_pattern.h.

nonlocal_pattern

SparsityPattern::NonlocalGraph libMesh::SparsityPattern::Build::nonlocal_pattern

Definition at line 100 of file sparsity_pattern.h.

sparsity_pattern

SparsityPattern::Graph libMesh::SparsityPattern::Build::sparsity_pattern

Definition at line 99 of file sparsity_pattern.h.

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

• include/base/sparsity_pattern.h