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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="KSPGROPPCG"><H1>KSPGROPPCG</H1></A>
A pipelined conjugate gradient method from Bill Gropp This method has two reductions, one of which is overlapped with the matrix-vector product and one of which is
overlapped with the preconditioner.
<P>
See also <A HREF="../KSP/KSPPIPECG.html#KSPPIPECG">KSPPIPECG</A>, which has only a single reduction that overlaps both the matrix-vector product and the preconditioner.
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
MPI configuration may be necessary for reductions to make asynchronous progress, which is important for performance of pipelined methods.
See the FAQ on the PETSc website for details.
<P>
<H3><FONT COLOR="#CC3333">Contributed by</FONT></H3>
Pieter Ghysels, Universiteit Antwerpen, Intel Exascience lab Flanders
<P>
<H3><FONT COLOR="#CC3333">Reference</FONT></H3>
http://www.cs.uiuc.edu/~wgropp/bib/talks/tdata/2012/icerm.pdf
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../KSP/KSPCreate.html#KSPCreate">KSPCreate</A>(), <A HREF="../KSP/KSPSetType.html#KSPSetType">KSPSetType</A>(), <A HREF="../KSP/KSPPIPECG.html#KSPPIPECG">KSPPIPECG</A>, <A HREF="../KSP/KSPPIPECR.html#KSPPIPECR">KSPPIPECR</A>, <A HREF="../KSP/KSPPGMRES.html#KSPPGMRES">KSPPGMRES</A>, <A HREF="../KSP/KSPCG.html#KSPCG">KSPCG</A>, <A HREF="../KSP/KSPCGUseSingleReduction.html#KSPCGUseSingleReduction">KSPCGUseSingleReduction</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/ksp/impls/cg/groppcg/groppcg.c.html#KSPGROPPCG">src/ksp/ksp/impls/cg/groppcg/groppcg.c</A>
<BR><A HREF="./index.html">Index of all KSP routines</A>
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