Nektar::SpatialDomains::MeshPartitionPtScotch Class Reference

#include <MeshPartitionPtScotch.h>

Inheritance diagram for Nektar::SpatialDomains::MeshPartitionPtScotch:

Public Member Functions
	MeshPartitionPtScotch (const LibUtilities::SessionReaderSharedPtr session, LibUtilities::CommSharedPtr comm, int meshDim, std::map< int, MeshEntity > element, CompositeDescriptor compMap)
	~MeshPartitionPtScotch () override
Public Member Functions inherited from Nektar::SpatialDomains::MeshPartition
	MeshPartition (const LibUtilities::SessionReaderSharedPtr session, LibUtilities::CommSharedPtr comm, int meshDim, std::map< int, MeshEntity > element, CompositeDescriptor compMap)
virtual	~MeshPartition ()
void	PartitionMesh (int nParts, bool shared=false, bool overlapping=false, int nLocal=0)
void	PrintPartInfo (std::ostream &out)
void	GetElementIDs (const int procid, std::vector< unsigned int > &tmp)

Static Public Member Functions
static MeshPartitionSharedPtr	create (const LibUtilities::SessionReaderSharedPtr session, LibUtilities::CommSharedPtr comm, int meshDim, std::map< int, MeshEntity > element, CompositeDescriptor compMap)
	Creates an instance of this class. More...

Static Public Attributes
static std::string	className
	Name of class. More...
static std::string	cmdSwitch

Protected Member Functions
void	v_PartitionGraphImpl (int &nVerts, int &nVertConds, Nektar::Array< Nektar::OneD, int > &xadj, Nektar::Array< Nektar::OneD, int > &adjcy, Nektar::Array< Nektar::OneD, int > &vertWgt, Nektar::Array< Nektar::OneD, int > &vertSize, Nektar::Array< Nektar::OneD, int > &edgeWgt, int &nparts, int &volume, Nektar::Array< Nektar::OneD, int > &part) final
Protected Member Functions inherited from Nektar::SpatialDomains::MeshPartition
void	ReadExpansions ()
void	ReadConditions ()
void	WeightElements ()
void	CreateGraph ()
void	PartitionGraph (int nParts, bool overlapping=false)
	Partition the graph. More...
void	CheckPartitions (int nParts, Array< OneD, int > &pPart)
int	CalculateElementWeight (LibUtilities::ShapeType elmtType, bool bndWeight, int na, int nb, int nc)
int	CalculateEdgeWeight (LibUtilities::ShapeType elmtType, int na, int nb, int nc)
virtual void	v_PartitionGraphImpl (int &nVerts, int &nVertConds, Nektar::Array< Nektar::OneD, int > &xadj, Nektar::Array< Nektar::OneD, int > &adjcy, Nektar::Array< Nektar::OneD, int > &vertWgt, Nektar::Array< Nektar::OneD, int > &vertSize, Nektar::Array< Nektar::OneD, int > &edgeWgt, int &nparts, int &volume, Nektar::Array< Nektar::OneD, int > &part)=0

Additional Inherited Members
Protected Types inherited from Nektar::SpatialDomains::MeshPartition
typedef std::vector< unsigned int >	MultiWeight
typedef boost::adjacency_list< boost::setS, boost::vecS, boost::undirectedS, GraphVertexProperties, boost::property< boost::edge_index_t, unsigned int, GraphEdgeProperties > >	BoostGraph
typedef boost::graph_traits< BoostGraph >::vertex_descriptor	BoostVertex
typedef boost::graph_traits< BoostGraph >::edge_descriptor	BoostEdge
typedef boost::graph_traits< BoostGraph >::edge_iterator	BoostEdgeIterator
typedef boost::graph_traits< BoostGraph >::vertex_iterator	BoostVertexIterator
typedef boost::graph_traits< BoostGraph >::adjacency_iterator	BoostAdjacencyIterator
typedef std::vector< unsigned int >	NumModes
typedef std::map< std::string, NumModes >	NummodesPerField
Protected Attributes inherited from Nektar::SpatialDomains::MeshPartition
LibUtilities::SessionReaderSharedPtr	m_session
LibUtilities::CommSharedPtr	m_comm
int	m_dim
int	m_numFields
std::map< int, MeshEntity >	m_elements
std::map< int, MeshEntity >	m_ghostElmts
CompositeDescriptor	m_compMap
std::map< int, NummodesPerField >	m_expansions
std::map< int, LibUtilities::ShapeType >	m_shape
std::map< std::string, int >	m_fieldNameToId
std::map< int, MultiWeight >	m_vertWeights
std::map< int, MultiWeight >	m_vertBndWeights
std::map< int, MultiWeight >	m_edgeWeights
BoostGraph	m_graph
std::map< int, std::vector< unsigned int > >	m_localPartition
bool	m_weightingRequired
bool	m_weightBnd
bool	m_weightDofs
bool	m_shared
bool	m_parallel

Detailed Description

Definition at line 43 of file MeshPartitionPtScotch.h.

Constructor & Destructor Documentation

MeshPartitionPtScotch()

Nektar::SpatialDomains::MeshPartitionPtScotch::MeshPartitionPtScotch	(	const LibUtilities::SessionReaderSharedPtr	session,
		LibUtilities::CommSharedPtr	comm,
		int	meshDim,
		std::map< int, MeshEntity >	element,
		CompositeDescriptor	compMap
	)

Definition at line 59 of file MeshPartitionPtScotch.cpp.

    : MeshPartition(session, comm, meshDim, element, compMap)
{
    m_parallel = true;
}

References Nektar::SpatialDomains::MeshPartition::m_parallel.

~MeshPartitionPtScotch()

Nektar::SpatialDomains::MeshPartitionPtScotch::~MeshPartitionPtScotch ( )

override

Definition at line 68 of file MeshPartitionPtScotch.cpp.

{
}

Member Function Documentation

create()

static MeshPartitionSharedPtr Nektar::SpatialDomains::MeshPartitionPtScotch::create ( const LibUtilities::SessionReaderSharedPtr  session, LibUtilities::CommSharedPtr  comm, int  meshDim, std::map< int, MeshEntity >  element, CompositeDescriptor  compMap  )

inlinestatic

Creates an instance of this class.

Definition at line 47 of file MeshPartitionPtScotch.h.

    {
        return MemoryManager<MeshPartitionPtScotch>::AllocateSharedPtr(
            session, comm, meshDim, element, compMap);
    }

References Nektar::MemoryManager< DataType >::AllocateSharedPtr().

v_PartitionGraphImpl()

void Nektar::SpatialDomains::MeshPartitionPtScotch::v_PartitionGraphImpl ( int &  nVerts, int &  nVertConds, Nektar::Array< Nektar::OneD, int > &  xadj, Nektar::Array< Nektar::OneD, int > &  adjcy, Nektar::Array< Nektar::OneD, int > &  vertWgt, Nektar::Array< Nektar::OneD, int > &  vertSize, Nektar::Array< Nektar::OneD, int > &  edgeWgt, int &  nparts, int &  volume, Nektar::Array< Nektar::OneD, int > &  part  )

finalprotectedvirtual

Implements Nektar::SpatialDomains::MeshPartition.

Definition at line 72 of file MeshPartitionPtScotch.cpp.

{
    LibUtilities::CommMpiSharedPtr mpiComm =
        std::dynamic_pointer_cast<LibUtilities::CommMpi>(
            m_comm->GetSpaceComm());
 
    ASSERTL0(mpiComm, "PtScotch not supported in serial execution.");
 
    SCOTCH_Dgraph scGraph;
    SCOTCH_CALL(SCOTCH_dgraphInit, (&scGraph, mpiComm->GetComm()));
    SCOTCH_CALL(SCOTCH_dgraphBuild,
                (&scGraph, 0, nVerts, nVerts, &xadj[0], &xadj[1], &vertWgt[0],
                 nullptr, adjcy.size(), adjcy.size(), &adjcy[0], nullptr,
                 nullptr));
    SCOTCH_CALL(SCOTCH_dgraphCheck, (&scGraph));
 
    SCOTCH_Strat strat;
    SCOTCH_CALL(SCOTCH_stratInit, (&strat));
    SCOTCH_CALL(SCOTCH_stratDgraphMapBuild,
                (&strat, SCOTCH_STRATQUALITY, nparts, nparts, 0.05));
 
    SCOTCH_CALL(SCOTCH_dgraphPart, (&scGraph, nparts, &strat, &part[0]));
}

References ASSERTL0, Nektar::SpatialDomains::MeshPartition::m_comm, and SCOTCH_CALL.

Member Data Documentation

className

std::string Nektar::SpatialDomains::MeshPartitionPtScotch::className

static

Initial value:

=
    GetMeshPartitionFactory().RegisterCreatorFunction(
        "PtScotch", MeshPartitionPtScotch::create,
        "Parallel partitioning using the PtScotch library.")

Name of class.

Definition at line 57 of file MeshPartitionPtScotch.h.

cmdSwitch

std::string Nektar::SpatialDomains::MeshPartitionPtScotch::cmdSwitch

static

Initial value:

=
    LibUtilities::SessionReader::RegisterCmdLineFlag(
        "use-ptscotch", "", "Use PtScotch for parallel mesh partitioning.")

Definition at line 58 of file MeshPartitionPtScotch.h.