PETSc version 3.17.0
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# PetscSFReduceEnd

end a reduction operation started with PetscSFReduceBegin()

### Synopsis

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

Collective

### Input Parameters

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

### Output Parameter

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

### See Also

PetscSFSetGraph(), PetscSFBcastEnd()

### Level

intermediate

### Location

src/vec/is/sf/interface/sf.c

### Examples

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

### Implementations

PetscSFReduceEnd_Allgatherv in src/vec/is/sf/impls/basic/allgatherv/sfallgatherv.c
PetscSFReduceEnd_Basic in src/vec/is/sf/impls/basic/sfbasic.c
PetscSFReduceEnd_Window in src/vec/is/sf/impls/window/sfwindow.c
Index of all PetscSF routines
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