dolfin team mailing list archive

[Johan Hake <johan.hake@xxxxxxxxx>]

On Tuesday September 20 2011 09:12:36 Anders Logg wrote:
> B11;rgb:0000/0000/0000On Tue, Sep 20, 2011 at 08:49:13AM -0700, Johan Hake 
wrote:
> > On Tuesday September 20 2011 08:45:01 Garth N. Wells wrote:
> > > On 20 September 2011 16:37, Johan Hake <johan.hake@xxxxxxxxx> wrote:
> > > > Ok, sounds promising!
> > > > 
> > > > Just to get it straight:
> > > >  1) The old MeshFunction file format will not be supported in
> > > >  parallel
> > > 
> > > Even better - your old file won't work in serial! The MeshFunction
> > > output is flawed (for edges and faces) because the edge and facet
> > > numbering is not specified by the mesh file. Edge and face numbering
> > > is determined by the library that constructs a mesh. The new format
> > > will be the same in serial and parallel.
> > 
> > Well, if you use the library (DOLFIN) to generate your MeshFunction you
> > are safe.
> 
> Not really, since it may break if we make some optimizations in
> TopologyComputation that happen to change the order in which we
> create edges and faces.

I have heard this now for 4 years, but the optimization has not been done :) 
But get me correct, I like the new solution!

Johan

> --
> Anders
> 
> > > >  2) To read a MeshFunction from file in parallel I need to convert
> > > >  
> > > >     all my MeshFunctions to MeshValueCollections and store them. Then
> > > >     I
> > > > 
> > > > use that file to initiate a MeshFunction in parallel?
> > > 
> > > I'll add something so if you read and old-style MeshFunction, and then
> > > write it to file, it will be written in the new  format.
> > 
> > So the file format of MeshValueCollection and MeshFunction will now be
> > the same?
> > 
> > 
> > Johan
> > 
> > > Garth
> > > 
> > > > Doable!
> > > > 
> > > > Johan
> > > > 
> > > > On Tuesday September 20 2011 01:17:25 Garth N. Wells wrote:
> > > >> On 20 September 2011 07:10, Anders Logg <logg@xxxxxxxxx> wrote:
> > > >> > MeshFunctions? I think MeshValueCollection works but not yet
> > > >> > MeshFunctions.
> > > >> > 
> > > >> > My suggestion is to either store MeshFunctions as
> > > >> > 
> > > >> > MeshValueCollections:
> > > >> >  <mesh_function>
> > > >> >  
> > > >> >    <mesh_value_collection>
> > > >> >    </mesh_value_collection>
> > > >> >  
> > > >> >  </mesh_function>
> > > >> > 
> > > >> > (when dim is not 0 or D) or to say that parallel I/O for
> > > >> > MeshFunction is not supported and make the conversion between
> > > >> > MeshFunction and MeshValueCollection easy (constructors).
> > > >> 
> > > >> I think that the suggestion to store MeshFunctions as
> > > >> MeshValueCollections is the best solution. To keep it simple, I
> > > >> would use MeshValueCollection for entities of any dimension with a
> > > >> tweak of the tags for vertices.
> > > >> 
> > > >> The tools are in place to read MeshValueCollections from a separate
> > > >> file. Just a few small additions are required to make it
> > > >> work (right now the domain data needs to be in the mesh file). Once
> > > >> this is in place reading MeshFunctions should be easy. I'll add the
> > > >> code today.
> > > >> 
> > > >> Garth
> > > >> 
> > > >> >> It seems to work now!
> > > >> >> 
> > > >> >> Kent
> > > >> >> 
> > > >> >> On 20 September 2011 01:06, Johan Hake <johan.hake@xxxxxxxxx> 
wrote:
> > > >> >>      How far are we from a functional reading of MeshFunctions in
> > > >> >>      parallel?
> > > >> >>      
> > > >> >>      Johan
> > > >> >>      
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