Cabana_Grid_ParticleDistributor.hpp File Reference

Multi-node particle redistribution using the grid halo. More...

#include <Cabana_DeepCopy.hpp>
#include <Cabana_Distributor.hpp>
#include <Cabana_Grid_GlobalGrid.hpp>
#include <Cabana_Grid_GlobalMesh.hpp>
#include <Cabana_Grid_LocalGrid.hpp>
#include <Cabana_Grid_LocalMesh.hpp>
#include <Kokkos_Core.hpp>
#include <vector>

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Namespaces
namespace	Cabana
	Core: particle data structures and algorithms.

Functions
template<class LocalGridType, std::size_t NSD = LocalGridType::num_space_dim>
std::enable_if_t< 3==NSD, std::vector< int > >	Cabana::Grid::getTopology (const LocalGridType &local_grid)
	Build neighbor topology of 27 nearest 3D neighbors. Some of the ranks in this list may be invalid.
template<class LocalGridType, std::size_t NSD = LocalGridType::num_space_dim>
std::enable_if_t< 2==NSD, std::vector< int > >	Cabana::Grid::getTopology (const LocalGridType &local_grid)
	Build neighbor topology of 8 nearest 2D neighbors. Some of the ranks in this list may be invalid.
template<class LocalGridType, class PositionSliceType>
int	Cabana::Grid::migrateCount (const LocalGridType &local_grid, const PositionSliceType &positions, const int minimum_halo_width)
	Check for the number of particles that must be communicated.
template<class LocalGridType, class PositionSliceType>
Cabana::Distributor< typename PositionSliceType::memory_space >	Cabana::Grid::createParticleDistributor (const LocalGridType &local_grid, PositionSliceType &positions)
	Determine which data should be migrated from one uniquely-owned decomposition to another uniquely-owned decomposition, using bounds of the grid and taking periodic boundaries into account.
template<class LocalGridType, class ParticlePositions, class ParticleContainer>
bool	Cabana::Grid::particleMigrate (const LocalGridType &local_grid, const ParticlePositions &positions, ParticleContainer &particles, const int min_halo_width, const bool force_migrate=false)
	Migrate data from one uniquely-owned decomposition to another uniquely-owned decomposition, using the bounds and periodic boundaries of the grid to determine which particles should be moved. In-place variant.
template<class LocalGridType, class ParticlePositions, class ParticleContainer>
bool	Cabana::Grid::particleMigrate (const LocalGridType &local_grid, const ParticlePositions &positions, const ParticleContainer &src_particles, ParticleContainer &dst_particles, const int min_halo_width, const bool force_migrate=false)
	Migrate data from one uniquely-owned decomposition to another uniquely-owned decomposition, using the bounds and periodic boundaries of the grid to determine which particles should be moved. Separate AoSoA variant.

Detailed Description

Multi-node particle redistribution using the grid halo.

Function Documentation

createParticleDistributor()

template<class LocalGridType, class PositionSliceType>

Cabana::Distributor< typename PositionSliceType::memory_space > Cabana::Grid::createParticleDistributor	(	const LocalGridType &	local_grid,
		PositionSliceType &	positions )

Determine which data should be migrated from one uniquely-owned decomposition to another uniquely-owned decomposition, using bounds of the grid and taking periodic boundaries into account.

Template Parameters

LocalGridType	LocalGrid type.
PositionSliceType	Position type.

Parameters

local_grid	The local grid containing periodicity and system bound information.
positions	The particle positions.

Returns

Distributor for later migration.

getTopology() [1/2]

template<class LocalGridType, std::size_t NSD = LocalGridType::num_space_dim>

std::enable_if_t< 3==NSD, std::vector< int > > Cabana::Grid::getTopology

(

const LocalGridType &

local_grid

)

Build neighbor topology of 27 nearest 3D neighbors. Some of the ranks in this list may be invalid.

Parameters

local_grid

Local grid from which MPI neighbors will be extracted.

Returns

MPI neighbor ranks in k,j,i order.

getTopology() [2/2]

template<class LocalGridType, std::size_t NSD = LocalGridType::num_space_dim>

std::enable_if_t< 2==NSD, std::vector< int > > Cabana::Grid::getTopology

(

const LocalGridType &

local_grid

)

Build neighbor topology of 8 nearest 2D neighbors. Some of the ranks in this list may be invalid.

Parameters

local_grid

Local grid from which MPI neighbors will be extracted.

Returns

MPI neighbor ranks in k,j,i order.

migrateCount()

template<class LocalGridType, class PositionSliceType>

int Cabana::Grid::migrateCount	(	const LocalGridType &	local_grid,
		const PositionSliceType &	positions,
		const int	minimum_halo_width )

Check for the number of particles that must be communicated.

Template Parameters

LocalGridType	LocalGrid type.
PositionSliceType	Particle position type.

Parameters

local_grid	The local grid containing periodicity and system bound information.
positions	The particle position container, either Slice or View.
minimum_halo_width	Number of halo mesh widths to include for ghosting.

particleMigrate() [1/2]

template<class LocalGridType, class ParticlePositions, class ParticleContainer>

bool Cabana::Grid::particleMigrate	(	const LocalGridType &	local_grid,
		const ParticlePositions &	positions,
		const ParticleContainer &	src_particles,
		ParticleContainer &	dst_particles,
		const int	min_halo_width,
		const bool	force_migrate = false )

Migrate data from one uniquely-owned decomposition to another uniquely-owned decomposition, using the bounds and periodic boundaries of the grid to determine which particles should be moved. Separate AoSoA variant.

Template Parameters

LocalGridType	LocalGrid type.
ParticlePositions	Particle position type.
ParticleContainer	AoSoA type.

Parameters

local_grid	The local grid containing periodicity and system bounds.
positions	Particle positions.
src_particles	The source particle AoSoA.
dst_particles	The destination particle AoSoA.
min_halo_width	Number of halo mesh widths to allow particles before migrating.
force_migrate	Migrate particles outside the local domain regardless of ghosted halo.

Returns

Whether any particle migration occurred.

particleMigrate() [2/2]

template<class LocalGridType, class ParticlePositions, class ParticleContainer>

bool Cabana::Grid::particleMigrate	(	const LocalGridType &	local_grid,
		const ParticlePositions &	positions,
		ParticleContainer &	particles,
		const int	min_halo_width,
		const bool	force_migrate = false )

Migrate data from one uniquely-owned decomposition to another uniquely-owned decomposition, using the bounds and periodic boundaries of the grid to determine which particles should be moved. In-place variant.

Template Parameters

LocalGridType	LocalGrid type.
ParticlePositions	Particle position type.
PositionContainer	AoSoA type.

Parameters

local_grid	The local grid containing periodicity and system bounds.
positions	Particle positions.
particles	The particle AoSoA.
min_halo_width	Number of halo mesh widths to allow particles before migrating.
force_migrate	Migrate particles outside the local domain regardless of ghosted halo.

Returns

Whether any particle migration occurred.