[petsc-dev] making DA more light weight

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:

> http://www.davidketcheson.info/2014/03/11/DMDA_memory.html

We discussed this here at the time.

https://plus.google.com/+DavidKetcheson/posts/f5ACSnrXznw

Matt has refused to implement DMLocalToGlobalBegin_Plex with consistent
semantics for INSERT_VALUES until I add support for a local
PetscSFReduce (skipping communication).  With that, we could replace the
VecScatters with PetscSF, which would amount to 2 or 3 integers worth of
storage for each leaf, independent of the number of dofs.  That could be
compressed in some cases, though I think we'll quickly run into loss of
generality if we push that.
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