petsc-3.14.6 2021-03-30
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
Examples
src/vec/is/sf/tutorials/ex1.c.html
Index of all PetscSF routines
Table of Contents for all manual pages
Index of all manual pages