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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/PCPFMG.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PCPFMG"><H1>PCPFMG</H1></A>
the hypre PFMG multigrid solver 
<P>
<H3><FONT COLOR="#CC3333">Options Database</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_pfmg_its &lt;its&gt; number of iterations of PFMG to use as preconditioner</B></TD><TD>- . -pc_pfmg_num_pre_relax &lt;steps&gt; number of smoothing steps before coarse grid
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_pfmg_num_post_relax &lt;steps&gt; number of smoothing steps after coarse grid</B></TD><TD>- . -pc_pfmg_tol &lt;tol&gt; tolerance of PFMG
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_pfmg_relax_type </B></TD><TD>- relaxation type for the up and down cycles, one of Jacobi,Weighted-Jacobi,symmetric-Red/Black-Gauss-Seidel,Red/Black-Gauss-Seidel
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_pfmg_rap_type </B></TD><TD>- type of coarse matrix generation, one of Galerkin,non-Galerkin
</TD></TR></TABLE>
<P>
Notes:  This is for CELL-centered descretizations
<P>
This must be used with the <A HREF="../DM/MATHYPRESTRUCT.html#MATHYPRESTRUCT">MATHYPRESTRUCT</A> matrix type.
This is less general than in hypre, it supports only one block per process defined by a PETSc <A HREF="../DM/DMDA.html#DMDA">DMDA</A>.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
  <A HREF="../PC/PCMG.html#PCMG">PCMG</A>, <A HREF="../DM/MATHYPRESTRUCT.html#MATHYPRESTRUCT">MATHYPRESTRUCT</A>
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/hypre/hypre.c.html#PCPFMG">src/ksp/pc/impls/hypre/hypre.c</A>
<BR><A HREF="./index.html">Index of all PC routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
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