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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/PC/PCREDISTRIBUTE.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PCREDISTRIBUTE"><H1>PCREDISTRIBUTE</H1></A>
Redistributes a matrix for load balancing, removing the rows that only have a diagonal entry and then applys a <A HREF="../KSP/KSP.html#KSP">KSP</A> to that new matrix Options for the redistribute preconditioners can be set with -redistribute_ksp_xxx <values> and -redistribute_pc_xxx <values>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Usually run this with -ksp_type preonly
<P>
If you have used <A HREF="../Mat/MatZeroRows.html#MatZeroRows">MatZeroRows</A>() to eliminate (for example, Dirichlet) boundary conditions for a symmetric problem then you can use, for example, -ksp_type preonly
-pc_type redistribute -redistribute_ksp_type cg -redistribute_pc_type bjacobi -redistribute_sub_pc_type icc to take advantage of the symmetry.
<P>
This does NOT call a partitioner to reorder rows to lower communication; the ordering of the rows in the original matrix and redistributed matrix is the same.
<P>
<H3><FONT COLOR="#CC3333">Developer Notes</FONT></H3>
Should add an option to this preconditioner to use a partitioner to redistribute the rows to lower communication.
<P>
<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/PCRedistributeGetKSP.html#PCRedistributeGetKSP">PCRedistributeGetKSP</A>()
<BR><P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/ksp/pc/impls/redistribute/redistribute.c.html#PCREDISTRIBUTE">src/ksp/pc/impls/redistribute/redistribute.c</A>
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