[Dune] dune auf Supercomputern?

Markus Müller markus.mueller.1 at uni-jena.de
Sun Jun 29 10:29:16 CEST 2008


Thank you again
I look forward to laying my hands on this project. But since I have to
finish my thesis in the next two weeks or so you will probably hear not much
more of me till then.;)
Besides I will have to learn a bit C++ before I start.  I am already
familiar with object oriented languages (ruby and java) but not with all
that header file stuff and certainly not with templating. Maybe you could
give me a hint about a good online-tutorial or book.
But only if you have time.

Greetings
Markus


2008/6/28 Christian Engwer <christi at uni-hd.de>:

> Dear Markus,
>
> > Thank you very much for the quick answer.
> > The altix has an intel 10.1 c++ compiler istalled and could be an option.
> >
> http://www.lrz-muenchen.de/services/software/programmierung/intel_compilers/
> > The proposed project migration would not be a mere porting but a complete
> > reimplementation of the solver which is a mixture of fortran 77 and 90
> with
> > MPI up to now.
>
> That should be fine.
>
> > So there is no code that could get in the way yet, but its a lot of work
> to
> > be done and we are anxious to get the answers to some questions before we
> > start. Perhaps you can answer some of them out of hand right now.
> > You mentioned some parallel grid managers. Since up to now I have written
> > the code needed for discretization myself, I do not know exactly what a
> tool
> > like a grid manager really does and, even more important, what it does
> not.
> > So I just describe our problem and what we hope to gain using dune.
> > We certainly need an inf-sup stable finite element pair( Taylor Hood for
> > instance)  for a Stokes system with very strongly varying and even
> > discontinuous viscosity.
> > We also have to discretize a convection diffusion equation so wee need
> the
> > ability to implement a streamline diffusion discretization, possibly with
> > the same elements we used for the Stokes system.
> > We want to use a parallel algebraic multigrid solver for both of the
> > discretized problems (because of the discontinuities).
> > We want to be able to implement adaptive mesh refinement and do not want
> to
> > bother about load balancing issues arising from this.
> >
> > So
> > 1.) We would be thankful if  you could give us your opinion if you deem
> our
> > plan possible!
>
> I think it is feasible. The stable Dune modules currently cover the
> grid interface and istl (the iterative solver template
> library). dune-istl also includes an algebraic multigrid solver.
>
> > and
> > 2.) perhaps tell me what grid managers or solvers are available and how I
> > can find out, what I need to know.
> > (A link to a documentation of a parallel grid manager that works with
> dune
> > perhaps)
>
> OK. From the features page
> http://www.dune-project.org/doc/devel/features.html
> you find links to the documentation of the different grid
> implementations. All parallel adaptive grid managers are third party
> software, but accessible thorugh the dune grid interface. The grid
> mangers takes care of the details of grid refinement and load
> balancing. It offers you a clear interface of how to access the
> entities in the grid. We two papers linked from our website, the first
> one gives clear definition of what a grid is (very mathematical) and
> the second one describes how this definition is transformed into a c++
> interface and shows some applications.
>
> Cheers Christian
>
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