File: PCREDISTRIBUTE.html

package info (click to toggle)
petsc 3.4.2.dfsg1-8.1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 129,104 kB
  • ctags: 516,422
  • sloc: ansic: 395,939; cpp: 47,201; python: 34,788; makefile: 17,193; fortran: 16,251; f90: 1,592; objc: 954; sh: 822; xml: 621; java: 381; lisp: 293; csh: 241
file content (30 lines) | stat: -rw-r--r-- 2,212 bytes parent folder | download 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
<HTML>
<HEAD> <link rel="canonical" href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCREDISTRIBUTE.html" />
<META NAME="GENERATOR" CONTENT="DOCTEXT">
<TITLE>PCREDISTRIBUTE</TITLE>
</HEAD>
<BODY BGCOLOR="FFFFFF">
   <div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></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 &lt;values&gt; and -redistribute_pc_xxx &lt;values&gt;
<P>
Notes:  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>
Developer Notes: 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><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/redistribute/redistribute.c.html#PCREDISTRIBUTE">src/ksp/pc/impls/redistribute/redistribute.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>
</BODY></HTML>