dolfin team mailing list archive

[Johan Hake <johan.hake@xxxxxxxxx>]

On Friday August 6 2010 09:27:25 Garth N. Wells wrote:
> 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.

Ok.

> > > 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.

Sounds like a good idea! I guess shared entities between processors add 
complexity to the reading and eventually writing of the different 
MeshFunctions?

Johan

> 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.
> > > > > To unsubscribe from this branch go to
> > > > > https://code.launchpad.net/~dolfin-core/dolfin/main/+edit-subscript
> > > > > ion
> > > > 
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