petsc-master 2014-12-20
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PetscSFReduceBegin

begin reduction of leafdata into rootdata, to be completed with call to PetscSFReduceEnd()

Synopsis

#include "petscsf.h" 
PetscErrorCode PetscSFReduceBegin(PetscSF sf,MPI_Datatype unit,const void *leafdata,void *rootdata,MPI_Op op)
Collective

Input Arguments

sf - star forest
unit - data type
leafdata - values to reduce
op - reduction operation

Output Arguments

rootdata -result of reduction of values from all leaves of each root

See Also

PetscSFBcastBegin()

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