Slice the n-dimensional dataset into hyperslabs and distribute chunks according to them. More...

#include <ChunkInfo.hpp>

Inheritance diagram for openPMD::chunk_assignment::ByCuboidSlice:

Public Member Functions
	ByCuboidSlice (std::unique_ptr< auxiliary::BlockSlicer > blockSlicer, Extent totalExtent)

Assignment	assign (PartialAssignment, RankMeta const &in, RankMeta const &out, size_t my_rank, size_t num_ranks) override
	Assign chunks to be loaded to reading processes.

virtual std::unique_ptr< Strategy >	clone () const override

Public Member Functions inherited from openPMD::chunk_assignment::Strategy
Assignment	assign (ChunkTable chunkTable, RankMeta const &in, RankMeta const &out, size_t my_rank, size_t num_ranks)
	Assign chunks to be loaded to reading processes.

Detailed Description

Slice the n-dimensional dataset into hyperslabs and distribute chunks according to them.

This strategy only produces chunks in the returned ChunkTable for the calling parallel process. Incoming chunks are intersected with the hyperslab and assigned to the current parallel process in case this intersection is non-empty.

Member Function Documentation

◆ assign()

Assignment openPMD::chunk_assignment::ByCuboidSlice::assign	(	PartialAssignment	partialAssignment,
		RankMeta const &	in,
		RankMeta const &	out,
		size_t	my_rank,
		size_t	num_ranks )

overridevirtual

Assign chunks to be loaded to reading processes.

To be defined by implementors.

Parameters

partialAssignment	Two chunktables, one of unassigned chunks and one of chunks that might have already been assigned previously. Merge the unassigned chunks into the partially assigned table.
in	Meta information on writing processes, e.g. hostnames.
out	Meta information on reading processes, e.g. hostnames.
my_rank	Rank identifier for the current process. Will be considered by some distribution strategies that may be called for only a subselection of the data space (e.g. for distributing data within processes on the same compute node in a cluster).
num_ranks	Number of processes among which chunks are to be distributed. Will be considered by some distribution strategies that may be called for only a subselection of the data space (e.g. for distributing data within processes on the same compute node in a cluster).

Returns: A table that assigns chunks to reading processes. Chunks are sorted by the destination process ID (MPI rank). Distribution strategies will in general only need to fill the chunks for the current (calling) process ID, but some (such as RoundRobin) will fill the information for other processes as well.

Implements openPMD::chunk_assignment::Strategy.

◆ clone()

std::unique_ptr< Strategy > openPMD::chunk_assignment::ByCuboidSlice::clone ( ) const