dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Wed, Aug 13, 2008 at 03:09:48PM +0100, Garth N. Wells wrote:
> 
> 
> Ola Skavhaug wrote:
> > 
> > 
> > On Wed, Aug 13, 2008 at 2:57 PM, Johan Hoffman <jhoffman@xxxxxxxxxx 
> > <mailto:jhoffman@xxxxxxxxxx>> wrote:
> > 
> >      >
> >      >
> >      > Johan Hoffman wrote:
> >      >>>
> >      >>> Anders Logg wrote:
> >      >>>> On Tue, Jun 17, 2008 at 02:45:41PM +0100, Garth N. Wells wrote:
> >      >>>>> It would be useful to lay out a plan for tackling DofMaps.
> >     Getting
> >      >>>>> this
> >      >>>>> right is the key to parallel assembly, assembly optimisations and
> >      >>>>> applying Dirichlet boundary conditions by eliminating
> >     Dirichlet dofs
> >      >>>>> from the global system.
> >      >>>>>
> >      >>>>> I'm happy to take a look, but I'll need some time because
> >     I've lost
> >      >>>>> my
> >      >>>>> overview of DofMaps. If someone else is already on top of it,
> >     I'd be
> >      >>>>> happy to provide feedback.
> >      >>>>>
> >      >>>>> Garth
> >      >>>> I won't have time to look at it until after the summer and I
> >     haven't
> >      >>>> started.
> >      >>>>
> >      >>>> Anyway, I think we should wait until after the next release
> >     until we
> >      >>>> start messing with the dof maps.
> >      >>>>
> >      >>>> Are there any issues we need to sort out before releasing 0.8? I'm
> >      >>>> thinking about a new release some time this or next week.
> >      >>>>
> >      >>>> One is to fix the bug in DirichletBC, but other than that?
> >      >>>>
> >      >>> Now would be a good time for a release so I can start messing with
> >      >>> DofMaps.
> >      >>>
> >      >>> Garth
> >      >>
> >      >> Has anything more been done about the DofMap design? During the
> >     summer
> >      >> Niclas has extended to general elements his adaptive algorithm for
> >      >> distributed parallel computing, so we are now ready to start messing
> >      >> with
> >      >> the DofMaps in order to implement his algorithm in DOLFIN.
> >      >>
> >      >
> >      > It has been given some thought, but no changes have been made in the
> >      > code yet.
> > 
> >     Ok. Any threads on the list to point to where this is discussed?
> > 
> >     If you have something already, I would suggest making it
> >      > publicly available somewhere for feedback before starting work on
> >     DOLFIN.
> > 
> >     It is a refinement and generalization of the thesis work of Niclas
> >     Jansson
> >     which was discussed on the list before the summer. Is is outlined in his
> >     report:
> >     http://www.nada.kth.se/utbildning/grukth/exjobb/rapportlistor/2008/rapporter08/jansson_niclas_08051.pdf
> > 
> >     My announcement here was to initiate a discussion of the detailed
> >     implementation, and to check if other DOLFIN-people were working on
> >     similar stuff to avoid double/conflicting development.
> > 
> >     /Johan
> > 
> > 
> > Very good. We were about to start on this task, so now a good point in 
> > time to join forces.
> > As a starting point, it would be nice to agreeing on what data is needed 
> > in addition to the partitioned meshes to construct the global dofmap. 
> > I.e. which MeshFunctions to construct during the mesh paritioning 
> > process. Are you people using the same {T,S,F} input as Anders describes 
> > in Algorithm 5 in his paper?
> > 
> 
> Which paper?

This one:

  http://home.simula.no/~logg/pub/papers/submitted-Log2008a.pdf

-- 
Anders

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