[petsc-dev] Lower memory DMDA

[Matthew Knepley]

On Tue, May 7, 2013 at 10:53 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> 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?
>

I would at least like to know what it is, and how the interface would have
to
change. This can't be all scatter memory.

   Matt

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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