On 2013-12-18 17:43, Anders Logg wrote:
On Wed, Dec 18, 2013 at 01:03:19PM +0000, Garth N. Wells wrote:
Chris has been working on adding a layer of ghost cells/mesh entities
to a DOLFIN Mesh when running in parallel. The branch is at:
https://bitbucket.org/fenics-project/dolfin/branch/chris/ghost-mesh
The motivations for this are:
1. Support DG methods in parallel.
2. Communication-less assembly in parallel with MPI
(GenericTensor::apply() will involve no communication).
3. Simpler construction of dofmaps (less MPI communication).
4. Simple detection of entities on a domain boundary.
5. Eliminates the need for a boundary mesh to build a distributed
mesh.
Wow. Sounds great!
To get this working, it would be helpful if we could remove the random
access from MeshEntityIterator, see
https://bitbucket.org/fenics-project/dolfin/issue/178. I don't think it
is needed.
Garth
--
Anders
In the first instance, the plan is that the mesh iterators will
iterate over the same entities they do now, ignoring ghost
entities. Existing parallel code should just run as it does
now. Longer term, it would be nice to support iterators over
different mesh views. There are quite a few problems for which
iteration over mesh views would be handy (in serial and in
parallel).
Please send a message if you have any comments or suggestions on the
above. I anticpate the code being ready to merge not long after the
1.3 release of DOLFIN.
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