[petsc-dev] Lower memory DMDA

[Jed Brown]

This thread is complaining about DMDA costing multiple vectors worth of
memory.

https://groups.google.com/d/msg/claw-dev/JwIjL5e48No/NOizc6i88gkJ

We currently set a lot of stuff up eagerly so that it can be accessed
using non-collective accessors.  When a Krylov method is used or a
matrix is assembled, that stuff is in the noise, but for explicit
methods, it can be the limiting factor for problem size.  Should we do
something about this?