Issue #30 new

Fix logic around pc->dm in PCMG

Jed Brown
created an issue

PCMG currently has a lot of logic checking for the presence of pc->dm, but it is automatically set if, for example, if the high-level logic comes from SNES. If a user manually sets coarse grids using the PCMG API, DMCoarsen will still be called, despite possibly having dm->ops->coarsen equal to NULL (thus seg-faulting). To fix this, we should (a) not call DMCoarsen when the user has already configured coarse levels and (b) test for capability and make such coarsening optional.

Untangling PCML and PCGAMG from meddling with PCMG internals should simplify this process.

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