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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/PCPARMS.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PCPARMS"><H1>PCPARMS</H1></A>
Allows the use of the parallel Algebraic Recursive Multilevel Solvers available in the package pARMS
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_global </B></TD><TD>- one of ras, schur, bj
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_local </B></TD><TD>- one of ilu0, iluk, ilut, arms
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_solve_tol </B></TD><TD>- set the tolerance for local solve
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_levels </B></TD><TD>- set the number of levels
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_nonsymmetric_perm </B></TD><TD>- set the use of nonsymmetric permutation
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_blocksize </B></TD><TD>- set the block size
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_ind_tol </B></TD><TD>- set the tolerance for independent sets
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_max_dim </B></TD><TD>- set the inner krylov dimension
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_max_it </B></TD><TD>- set the maximum number of inner iterations
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_inter_nonsymmetric_perm </B></TD><TD>- set the use of nonsymmetric permutation for interlevel blocks
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_inter_column_perm </B></TD><TD>- set the use of column permutation for interlevel blocks
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_inter_row_scaling </B></TD><TD>- set the use of row scaling for interlevel blocks
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_inter_column_scaling </B></TD><TD>- set the use of column scaling for interlevel blocks
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_last_nonsymmetric_perm </B></TD><TD>- set the use of nonsymmetric permutation for last level blocks
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_last_column_perm </B></TD><TD>- set the use of column permutation for last level blocks
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_last_row_scaling </B></TD><TD>- set the use of row scaling for last level blocks
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_last_column_scaling </B></TD><TD>- set the use of column scaling for last level blocks
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_lfil_ilu_arms </B></TD><TD>- set the amount of fill-in for ilut, iluk and arms
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_lfil_schur </B></TD><TD>- set the amount of fill-in for schur
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_lfil_ilut_L_U </B></TD><TD>- set the amount of fill-in for ILUT L and U
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_droptol_factors </B></TD><TD>- set the drop tolerance for L, U, L^{-1}F and EU^{-1}
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_droptol_schur_compl </B></TD><TD>- set the drop tolerance for schur complement at each level
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>-pc_parms_droptol_last_schur </B></TD><TD>- set the drop tolerance for ILUT in last level schur complement
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">IMPORTANT</FONT></H3>
Unless configured appropriately, this preconditioner performs an inexact solve
as part of the preconditioner application. Therefore, it must be used in combination
with flexible variants of iterative solvers, such as <A HREF="../KSP/KSPFGMRES.html#KSPFGMRES">KSPFGMRES</A> or KSPCGR.
<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/PC.html#PC">PC</A>
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/parms/parms.c.html#PCPARMS">src/ksp/pc/impls/parms/parms.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>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
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