On Tue, Feb 19, 2008 at 08:13:42PM +0100, Niclas Jansson wrote: > On Mon, 18 Feb 2008 20:16:43 +0100 > Anders Logg <[EMAIL PROTECTED]> wrote: > > > On Mon, Feb 18, 2008 at 08:06:27PM +0100, Niclas Jansson wrote: > > > On Mon, 18 Feb 2008 18:31:54 +0100 > > > Anders Logg <[EMAIL PROTECTED]> wrote: > > > > > > > > > > > We (Nicklas) have now a preliminary distributed parallel > > > > > implementation running for Poisson and a Unicorn flow solver. > > > > > The structure is still quite messy and the partitioning is based > > > > > on Metis, but we expect it to be integrated with DOLFIN in the > > > > > coming months, hopefully before the summer. > > > > > > > > Could this be done in small pieces? I'm a little worried about > > > > seeing big changesets that add things to the mesh classes. > > > > > > > > > When the structure is more clear we can discuss on the mailing > > > > > list how to best incorporate this into DOLFIN. Apart from the > > > > > structure of the implementation we are also focusing on > > > > > distributed local mesh refinement. > > > > > > > > Great. > > > > > > > > What is the difference from what we have now? Is it the same but > > > > with a distributed mesh (so each processor just sees the local > > > > part, not the whole mesh)? Or is it something different? > > > > > > > > > > Yes, each processor only sees the local part. The entire problem is > > > never represented on one processor. Preprocessing, assembly, > > > solution and postprocessing are all done without > > > gathering/scattering data to/from one processor. > > > > > > The only modification to the mesh classes is a new class storing > > > information about ghost points and vertex local to global mapping. > > > > What about local-to-global mapping of edges, faces etc? > > We haven't implement any of these mappings, mainly because our problems > only uses dofs on vertices. However they should be fairly simple to add.
ok. I think storing a facet-to-facet mapping (as in the link I sent earlier) should take care of everything. -- Anders _______________________________________________ DOLFIN-dev mailing list [email protected] http://www.fenics.org/mailman/listinfo/dolfin-dev
