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<A NAME="PCBJACOBI"><H1>PCBJACOBI</H1></A>
Use block Jacobi preconditioning, each block is (approximately) solved with its own <A HREF="../KSP/KSP.html#KSP">KSP</A> object.
<H3><FONT COLOR="#CC3333">Options Database Keys</FONT></H3>
<DT><B>-pc_bjacobi_truelocal </B> -Activates <A HREF="../PC/PCBJacobiSetUseTrueLocal.html#PCBJacobiSetUseTrueLocal">PCBJacobiSetUseTrueLocal</A>()
<br>
<P>
Notes: Each processor can have one or more blocks, but a block cannot be shared by more
than one processor. Defaults to one block per processor.
<P>
To set options on the solvers for each block append -sub_ to all the <A HREF="../KSP/KSP.html#KSP">KSP</A>, <A HREF="../KSP/KSP.html#KSP">KSP</A>, and <A HREF="../PC/PC.html#PC">PC</A>
options database keys. For example, -sub_pc_type ilu -sub_pc_factor_levels 1 -sub_ksp_type preonly
<P>
To set the options on the solvers separate for each block call <A HREF="../PC/PCBJacobiGetSubKSP.html#PCBJacobiGetSubKSP">PCBJacobiGetSubKSP</A>()
and set the options directly on the resulting <A HREF="../KSP/KSP.html#KSP">KSP</A> object (you can access its <A HREF="../PC/PC.html#PC">PC</A>
<A HREF="../KSP/KSPGetPC.html#KSPGetPC">KSPGetPC</A>())
<P>
<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><A HREF="../PC/PCASM.html#PCASM">PCASM</A>, <A HREF="../PC/PCBJacobiSetUseTrueLocal.html#PCBJacobiSetUseTrueLocal">PCBJacobiSetUseTrueLocal</A>(), <A HREF="../PC/PCBJacobiGetSubKSP.html#PCBJacobiGetSubKSP">PCBJacobiGetSubKSP</A>(), <A HREF="../PC/PCBJacobiSetTotalBlocks.html#PCBJacobiSetTotalBlocks">PCBJacobiSetTotalBlocks</A>(),
<A HREF="../PC/PCBJacobiSetLocalBlocks.html#PCBJacobiSetLocalBlocks">PCBJacobiSetLocalBlocks</A>(), PCSetModifySubmatrices()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>beginner
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/ksp/pc/impls/bjacobi/bjacobi.c.html#PCBJACOBI">src/ksp/pc/impls/bjacobi/bjacobi.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>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex7.c.html">src/ksp/ksp/examples/tutorials/ex7.c.html</A><BR>
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