petsc-3.7.7 2017-09-25
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