dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

On Fri, 2010-08-06 at 09:18 -0700, Johan Hake wrote:
> On Friday August 6 2010 08:55:44 Garth N. Wells wrote:
> > On Fri, 2010-08-06 at 08:42 -0700, Johan Hake wrote:
> > > On Friday August 6 2010 08:16:26 you wrote:
> > > > ------------------------------------------------------------
> > > > revno: 4896
> > > > committer: Garth N. Wells <gnw20@xxxxxxxxx>
> > > > branch nick: dolfin-all
> > > > timestamp: Fri 2010-08-06 16:13:29 +0100
> > > > 
> > > > message:
> > > >   Add simple Stokes solver for parallel testing.
> > > >   
> > > >   Other Stokes demos don't run in parallel because MeshFunction io is
> > > >   not supported in parallel.
> > > 
> > > Does anyone have an overview of what is needed for this to be fixed. I
> > > couldn't find a blueprint on it.
> > 
> > Here it is:
> > 
> >     https://blueprints.launchpad.net/dolfin/+spec/parallel-io
> 
> Ok
> 
> > > I am interested in getting this fixed :)
> > 
> > Me too! We need to look at all the io since much of it is broken in
> > parallel.
> 
> Ok, but isn't this two different problems. 
> 
>   1) Reading in a MeshFunction from a ordinary file into a parallel structur,
>      in line with what we do with the Mesh.
>   2) Storing and reading parallel structures
> 
> or are these connected in some way?
> 

Connected since we want to be able to read in a file which is in m parts
when running with n processes. Case one is m = 1, with n arbitrary.

> > We need to settle on how to handle XML data. I favour (and I know Niclas
> > Janson does too) the VTK approach in which we have a 'master file' that
> > points to other XML files which contain portions of the vector/mesh,
> > etc. Process zero can read the 'master file' and then instruct the other
> > processes on which file(s) they should read in.
> 
> I guess this goes for case 2?
> 
> I am in more need of getting 1) fixed.
> 

If we can settle on a format for the 'master file', we should be able to
care of the lot. A first step can be to make it work when reading just
one file. 

Garth

> Johan
> 
> > Garth
> > 
> > > Johan
> > > 
> > > >   demo/pde/stokes/simple/
> > > >   demo/pde/stokes/simple/cpp/
> > > >   demo/pde/stokes/simple/cpp/SConstruct
> > > >   demo/pde/stokes/simple/cpp/Stokes.h
> > > >   demo/pde/stokes/simple/cpp/Stokes.ufl
> > > >   demo/pde/stokes/simple/cpp/main.cpp
> > > >   demo/pde/stokes/simple/python/
> > > >   demo/pde/stokes/simple/python/demo.py
> > > > 
> > > > The size of the diff (13308 lines) is larger than your specified limit
> > > > of 1000 lines
> > > > 
> > > > --
> > > > lp:dolfin
> > > > https://code.launchpad.net/~dolfin-core/dolfin/main
> > > > 
> > > > Your team DOLFIN Core Team is subscribed to branch lp:dolfin.
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> > > 
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