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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</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-3.7.5 v3.7.5 docs/manualpages/PC/PCREDUNDANT.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PCREDUNDANT"><H1>PCREDUNDANT</H1></A>
Runs a <A HREF="../KSP/KSP.html#KSP">KSP</A> solver with preconditioner for the entire problem on subgroups of processors Options for the redundant preconditioners can be set with -redundant_pc_xxx for the redundant <A HREF="../KSP/KSP.html#KSP">KSP</A> with -redundant_ksp_xxx
<P>
<H3><FONT COLOR="#CC3333">Options Database</FONT></H3>
<DT><B>-pc_redundant_number <n> </B> -number of redundant solves, for example if you are using 64 MPI processes and
use an n of 4 there will be 4 parallel solves each on 16 = 64/4 processes.
<br>
<P>
<P>
Notes: The default <A HREF="../KSP/KSP.html#KSP">KSP</A> is preonly and the default <A HREF="../PC/PC.html#PC">PC</A> is LU.
<P>
<A HREF="../PC/PCFactorSetShiftType.html#PCFactorSetShiftType">PCFactorSetShiftType</A>() applied to this <A HREF="../PC/PC.html#PC">PC</A> will convey they shift type into the inner <A HREF="../PC/PC.html#PC">PC</A> if it is factorization based.
<P>
Developer Notes: Note that PCSetInitialGuessNonzero() is not used by this class but likely should be.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../PC/PCCreate.html#PCCreate">PCCreate</A>(), <A HREF="../PC/PCSetType.html#PCSetType">PCSetType</A>(), <A HREF="../PC/PCType.html#PCType">PCType</A> (for list of available types), <A HREF="../PC/PCRedundantSetScatter.html#PCRedundantSetScatter">PCRedundantSetScatter</A>(),
<BR><A HREF="../PC/PCRedundantGetKSP.html#PCRedundantGetKSP">PCRedundantGetKSP</A>(), <A HREF="../PC/PCRedundantGetOperators.html#PCRedundantGetOperators">PCRedundantGetOperators</A>(), <A HREF="../PC/PCRedundantSetNumber.html#PCRedundantSetNumber">PCRedundantSetNumber</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/redundant/redundant.c.html#PCREDUNDANT">src/ksp/pc/impls/redundant/redundant.c</A>
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