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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<A NAME="PetscCommSplitReductionBegin"><H1>PetscCommSplitReductionBegin</H1></A>
Begin an asynchronous split-mode reduction
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscvec.h"
PetscErrorCode PetscCommSplitReductionBegin(MPI_Comm comm)
</PRE>
Collective but not synchronizing
<P>
<H3><FONT COLOR="#CC3333">Input Arguments</FONT></H3>
comm - communicator on which split reduction has been queued
<P>
<P>
<H3><FONT COLOR="#CC3333">Note</FONT></H3>
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()).
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Vec/VecNormBegin.html#VecNormBegin">VecNormBegin</A>(), <A HREF="../Vec/VecNormEnd.html#VecNormEnd">VecNormEnd</A>(), <A HREF="../Vec/VecDotBegin.html#VecDotBegin">VecDotBegin</A>(), <A HREF="../Vec/VecDotEnd.html#VecDotEnd">VecDotEnd</A>(), <A HREF="../Vec/VecTDotBegin.html#VecTDotBegin">VecTDotBegin</A>(), <A HREF="../Vec/VecTDotEnd.html#VecTDotEnd">VecTDotEnd</A>(), <A HREF="../Vec/VecMDotBegin.html#VecMDotBegin">VecMDotBegin</A>(), <A HREF="../Vec/VecMDotEnd.html#VecMDotEnd">VecMDotEnd</A>(), <A HREF="../Vec/VecMTDotBegin.html#VecMTDotBegin">VecMTDotBegin</A>(), <A HREF="../Vec/VecMTDotEnd.html#VecMTDotEnd">VecMTDotEnd</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/vec/vec/utils/comb.c.html#PetscCommSplitReductionBegin">src/vec/vec/utils/comb.c</A>
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