PETSc version 3.16.5
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# PetscSFReduceWithMemTypeBegin

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

### Synopsis

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

Collective

### Input Parameters

| sf | - star forest
| unit | - data type
| leafmtype | - memory type of leafdata
| leafdata | - values to reduce
| rootmtype | - memory type of rootdata
| op | - reduction operation

### Output Parameter

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

### See Also

PetscSFBcastBegin(), PetscSFReduceBegin()

### Level

intermediate

### Location

src/vec/is/sf/interface/sf.c
Index of all PetscSF routines
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Index of all manual pages