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<title>AO</title><body bgcolor="FFFFFF">
<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/concepts/ao.html "><small>Report Typos and Errors</small></a></div>
<h2>AO</h2>
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<LI><A HREF="../../../src/snes/examples/tutorials/ex10d/ex10.c.html"><CONCEPT>application to PETSc ordering or vice versa;</CONCEPT></A>
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An Unstructured Grid Example.<BR>This example demonstrates how to solve a nonlinear system in parallel<BR>
with SNES for an unstructured mesh. The mesh and partitioning information<BR>
is read in an application defined ordering,which is later transformed<BR>
into another convenient ordering (called the local ordering). The local<BR>
ordering, apart from being efficient on cpu cycles and memory, allows<BR>
the use of the SPMD model of parallel programming. After partitioning<BR>
is done, scatters are created between local (sequential)and global<BR>
(distributed) vectors. Finally, we set up the nonlinear solver context<BR>
in the usual way as a structured grid (see<BR>
petsc/src/snes/examples/tutorials/ex5.c).<BR>
This example also illustrates the use of parallel matrix coloring.<BR>
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