PetscLayoutMapLocal

Maps a set of global indices to the subset owned locally by each MPI process according to a PetscLayout

Synopsis

#include "petscsf.h"   
PetscErrorCode PetscLayoutMapLocal(PetscLayout map, PetscInt N, const PetscInt idxs[], PetscInt *on, PetscInt *oidxs[], PetscInt *ogidxs[])

Collective

Input Parameters

• map - the PetscLayout describing global ownership

• N - the number of input indices

• idxs - the global indices; negative entries are ignored

Output Parameters

• on - number of indices in the returned local set (may be NULL)

• oidxs - the local (0-based) indices owned by this MPI process (may be NULL); caller must PetscFree()

• ogidxs - the corresponding global indices in a compact numbering (may be NULL); caller must PetscFree()

Developer Note

Uses a PetscSF internally to route each input index to its owner and reduce with MPI_LOR, producing on each MPI process the sorted, deduplicated list of local indices for which at least one process supplied a matching global index.

See Also

PetscLayout, PetscSF, PetscLayoutFindOwner(), PetscSFCreateFromLayouts()

Level

developer

Location

src/vec/is/sf/utils/sfutils.c

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Index of all PetscSF routines
Table of Contents for all manual pages
Index of all manual pages