[petsc-users] Structured multi-block topology

[Mark Lohry]

To resurrect this thread:
https://lists.mcs.anl.gov/mailman/htdig/petsc-users/2012-August/014930.html

Matt Knepley suggested the correct way to handle a structred
multi-block mesh was to use DMComposite. I'm not seeing anything in
the documentation about how to properly use DMComposite, however.

What are the necessary steps to go from a single-block code using DMDA
to a multi-block code that handles all the appropriate data passing at
block boundaries?