petsc-3.5.1 2014-08-06
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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

See Also

PetscSFComputeDegreeBegin(), PetscSFScatterBegin()

Level:intermediate
Location:
src/vec/is/sf/interface/sf.c
Index of all PetscSF routines
Table of Contents for all manual pages
Index of all manual pages

Examples

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