petsc-3.6.2 2015-10-02
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# PetscCommSplitReductionBegin

Begin an asynchronous split-mode reduction

### Synopsis

    #include "petscvec.h"
    PetscErrorCode PetscCommSplitReductionBegin(MPI_Comm comm)

Collective but not synchronizing

### Input Arguments

comm - communicator on which split reduction has been queued

### Note

Calling this function is optional when using split-mode reduction. On supporting hardware, calling this after all VecXxxBegin() allows the reduction to make asynchronous progress before the result is needed (in VecXxxEnd()).

### See Also

VecNormBegin(), VecNormEnd(), VecDotBegin(), VecDotEnd(), VecTDotBegin(), VecTDotEnd(), VecMDotBegin(), VecMDotEnd(), VecMTDotBegin(), VecMTDotEnd()

Level:advanced
Location: src/vec/vec/utils/comb.c
Index of all Vec routines
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Index of all manual pages