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<div id="version" align=right><b>petsc-3.10.3 2018-12-18</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.10.3 v3.10.3 docs/manualpages/KSP/KSPPIPELCG.html "><small>Report Typos and Errors</small></a></div>
<A NAME="KSPPIPELCG"><H1>KSPPIPELCG</H1></A>
Deep pipelined (length l) Conjugate Gradient method. This method has only a single non-blocking global reduction per iteration, compared to 2 blocking reductions for standard CG. The reduction is overlapped by the matrix-vector product and preconditioner application of the next l iterations. The pipeline length l is a parameter of the method.
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<DT><B>see <A HREF="../KSP/KSPSolve.html#KSPSolve">KSPSolve</A>()</B> -
<br>
<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>
Siegfried Cools, University of Antwerp, Dept. Mathematics and Computer Science,
funded by Flemish Research Foundation (FWO) grant number 12H4617N.
<P>
<H3><FONT COLOR="#CC3333">Reference</FONT></H3>
J. Cornelis, S. Cools and W. Vanroose,
"The Communication-Hiding Conjugate Gradient Method with Deep Pipelines", Submitted to SIAM Journal on Scientific
Computing (SISC), 2018.
<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/KSPType.html#KSPType">KSPType</A> (for list of available types), <A HREF="../KSP/KSPCG.html#KSPCG">KSPCG</A>, <A HREF="../KSP/KSPPIPECG.html#KSPPIPECG">KSPPIPECG</A>, <A HREF="../KSP/KSPPIPECGRR.html#KSPPIPECGRR">KSPPIPECGRR</A>, <A HREF="../KSP/KSPPGMRES.html#KSPPGMRES">KSPPGMRES</A>,
<BR><A HREF="../KSP/KSPPIPEBCGS.html#KSPPIPEBCGS">KSPPIPEBCGS</A>, <A HREF="../KSP/KSPSetPCSide.html#KSPSetPCSide">KSPSetPCSide</A>()
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/ksp/ksp/impls/cg/pipelcg/pipelcg.c.html#KSPPIPELCG">src/ksp/ksp/impls/cg/pipelcg/pipelcg.c</A>
<BR><A HREF="./index.html">Index of all KSP routines</A>
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