[petsc-users] why the user manual does not include the instruction for DMMesh and adda. how to lean it.

[Jed Brown]

DMMesh is deprecated and will be removed in the next release.  Please
use its replacement, DMPlex, which is documented.

ADDA is pretty much unsupported.  (The code was a student project, and
generally not up to the standards of the rest of the library.)  Can you
describe the problem that you are considering using it for?