dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Tue, Sep 20, 2011 at 09:17:06AM -0700, Johan Hake wrote:
> 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!

It might happen, I keep hearing that mesh.init(d) is slow. :-)

It has actually already been optimized once but that didn't have any
effect on the numbering.

I think it would be relatively easy to speed it up a bit using OpenMP.

--
Anders


> Johan
>
> wrote:
> > > > >> >>      How far are we from a functional reading of MeshFunctions in
> > > > >> >>      parallel?
> > > > >> >>
> > > > >> >>      Johan
> > > > >> >>
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