fenics team mailing list archive

[Johan Hake <johan.hake@xxxxxxxxx>]

On Thursday February 24 2011 12:50:47 Anders Logg wrote:
> On Thu, Feb 24, 2011 at 07:54:35PM +0000, Garth N. Wells wrote:
> > On 24/02/11 19:20, Anders Logg wrote:
> > > On Thu, Feb 24, 2011 at 04:23:36PM +0000, Garth N. Wells wrote:
> > >> We've just added 'create' functions to UFC, but it would also be
> > >> useful to add 'copy' functions. It'd like to get a copy a
> > >> ufc::dofmap, but I can't do it at present. 'create' doesn't work
> > >> since I don't have the mesh available in order to initialise the
> > >> ufc::dofmap that it returned by 'create'.
> > > 
> > > Implementing copy might be problematic for form compilers since it
> > > would involve copying data that may have been generated as part of the
> > > call to init_mesh and init_cell. It's no big deal in the case of FFC
> > > since only _global_dimension needs to be copied, but it might be
> > > problematic in general. The more functions we add to the interface,
> > > the more work it is to implement the UFC interface.
> > > 
> > > It would be better to store the Mesh as part of the DofMap so that a
> > > copy can be created using the create function.
> > 
> > I'm reluctant to add the Mesh to DofMap, since unless we store a copy of
> > the Mesh the Mesh could change which would make it inconsistent with the
> > dof map. Also, I've tried to simplify DofMap and minimise the private
> > data because it can get pretty complex with views, parallel ownership,
> > etc.

Looking forward to the technical report:

  Parallel dofmap in DOLFIN: The easy way

Johan

> Good.
> 
> > For now I've added GenericDofMap::copy(const Mesh& mesh), which is ok.
> > Internally, DofMap creates some UFCMesh objects which could be avoided
> > if ufc::dofmaps could be copied.
> 
> I was going to suggest something like that.
> 
> --
> Anders
> 
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