IndexMapping.hpp File Reference

Global-to-local index mapping for distributed arrays. More...

#include <unordered_map>
#include <algorithm>
#include <tuple>
#include "Defines.hpp"
#include "MPI.hpp"

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Classes
class	DNDS::GlobalOffsetsMapping
	Table mapping rank-local row indices to the global index space. More...
class	DNDS::OffsetAscendIndexMapping
	Mapping between a rank's main data and its ghost copies. More...

Namespaces
namespace	DNDS
	the host side operators are provided as implemented

Detailed Description

Global-to-local index mapping for distributed arrays.

Unit Test Coverage (test_IndexMapping.cpp, MPI np=1,2,4)

• GlobalOffsetsMapping: setMPIAlignBcast, globalSize, RLengths, ROffsets, operator() (local-to-global), search (global-to-local, both overloads) – uniform and non-uniform distributions – edge cases: out-of-range, negative index, rank boundary crossing
• OffsetAscendIndexMapping (pull-based): searchInMain, searchInGhost, searchInAllGhost, search, search_indexAppend, operator() (reverse mapping) – empty ghost set edge case

Not Yet Tested

• Push-based OffsetAscendIndexMapping constructor
• sort(), ghostAt(), search_indexRank
• Duplicate pull indices

Definition in file IndexMapping.hpp.