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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
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<A NAME="PetscBuildTwoSidedType"><H1>PetscBuildTwoSidedType</H1></A>
algorithm for setting up two-sided communication
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
typedef enum {
PETSC_BUILDTWOSIDED_NOTSET = -1,
PETSC_BUILDTWOSIDED_ALLREDUCE = 0,
PETSC_BUILDTWOSIDED_IBARRIER = 1,
PETSC_BUILDTWOSIDED_REDSCATTER = 2
/* Updates here must be accompanied by updates in finclude/petscsys.h and the string array in mpits.c */
} <A HREF="../Sys/PetscBuildTwoSidedType.html#PetscBuildTwoSidedType">PetscBuildTwoSidedType</A>;
</PRE>
<pre>
PETSC_BUILDTWOSIDED_ALLREDUCE - classical algorithm using an MPI_Allreduce with
</pre>
<pre>
a buffer of length equal to the communicator size. Not memory-scalable due to
</pre>
<pre>
the large reduction size. Requires only MPI-1.
</pre>
<pre>
PETSC_BUILDTWOSIDED_IBARRIER - nonblocking algorithm based on MPI_Issend and MPI_Ibarrier.
</pre>
<pre>
Proved communication-optimal in Hoefler, Siebert, and Lumsdaine (2010). Requires MPI-3.
</pre>
<pre>
PETSC_BUILDTWOSIDED_REDSCATTER - similar to above, but use more optimized function
</pre>
<pre>
that only communicates the part of the reduction that is necessary. Requires MPI-2.
</pre>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscCommBuildTwoSided.html#PetscCommBuildTwoSided">PetscCommBuildTwoSided</A>(), <A HREF="../Sys/PetscCommBuildTwoSidedSetType.html#PetscCommBuildTwoSidedSetType">PetscCommBuildTwoSidedSetType</A>(), <A HREF="../Sys/PetscCommBuildTwoSidedGetType.html#PetscCommBuildTwoSidedGetType">PetscCommBuildTwoSidedGetType</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../include/petscsys.h.html#PetscBuildTwoSidedType">include/petscsys.h</A>
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