[petsc-dev] DMGetDefaultSection() and lazy creation

[Tobin Isaac]

Hi Matt,

There's some ambiguity in the collective status of the default
section.  In plex and da, the default section encodes only local
information, but inherits its communicator from the DM.

One the one hand, the createdefaultsection methods make for clean
code, but on the other hand, they force DMGetDefaultSection() to be
collective on the default section, which means we currently have no
purely local accessor for it.

Any thoughts?

  Toby
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