On Nov 24, 2011, at 7:33 PM, Jed Brown wrote:

On Thu, Nov 24, 2011 at 18:56, Matthew Knepley <[email protected]> wrote: I think the idea of a local point of view is fundamental, not just for parallelism. We use LocalToGlobal mappings in FS so that yu do not have to know about other fields, just the same as you should not have to know about other processes.

I agree, local-to-global is the key to scalability. The challenge is making everything run along scalable pipes the way local-to-global does. I think we can do that with these primitives.

Jed, I have no idea what you are talking about. What is "local to global" and what are "these primitives"? Example, how do I write a triangular solve using "local to global" and "these primatives? How do I write application of a stencil operator using "local to global" and "these primatives? How do I write sparse matrix vector product using "local to global" and "these primatives? etc etc Barry