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 Arguments

sf - star forest
unit - data type
leafdata - leaf data to gather to roots

Output Argument

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

Level: intermediate

See Also

PetscSFComputeDegreeBegin(), PetscSFScatterBegin()

Location:sf.c