PetscSFGatherBegin

begin pointwise gather of all leaves into multi-roots, to be completed with PetscSFGatherEnd()

Synopsis

#include "petscsf.h" 
PetscErrorCode PetscSFGatherBegin(PetscSF sf, MPI_Datatype unit, const void *leafdata, void *multirootdata)

Collective

Input Parameters

• sf - star forest

• unit - data type

• leafdata - leaf data to gather to roots

Output Parameter

• multirootdata - root buffer to gather into, amount of space per root is equal to its degree

See Also

PetscSF, PetscSFComputeDegreeBegin(), PetscSFScatterBegin()

Level

intermediate

Location

src/vec/is/sf/interface/sf.c

Examples

src/vec/is/sf/tutorials/ex1.c

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Index of all PetscSF routines
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Index of all manual pages