petsc-master 2019-08-18
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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

Examples

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

Implementations

PetscSFReduceBegin_Allgather in src/vec/is/sf/impls/basic/allgather/sfallgather.c
PetscSFReduceBegin_Allgatherv in src/vec/is/sf/impls/basic/allgatherv/sfallgatherv.c
PetscSFReduceBegin_Alltoall in src/vec/is/sf/impls/basic/alltoall/sfalltoall.c
PetscSFReduceBegin_Gather in src/vec/is/sf/impls/basic/gather/sfgather.c
PetscSFReduceBegin_Gatherv in src/vec/is/sf/impls/basic/gatherv/sfgatherv.c
PetscSFReduceBegin_Neighbor in src/vec/is/sf/impls/basic/neighbor/sfneighbor.c
PetscSFReduceBegin_Basic in src/vec/is/sf/impls/basic/sfbasic.c
PetscSFReduceBegin_Window in src/vec/is/sf/impls/window/sfwindow.c

Index of all PetscSF routines
Table of Contents for all manual pages
Index of all manual pages