petsc-3.7.7 2017-09-25
   
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