[Dune] Performace of ISTL

[Markus Blatt]

Hi,

On Fri, Apr 20, 2007 at 03:52:43PM +0200, Patrick Leidenberger wrote:
> Hi all,
> 
> thanks a lot for the quick response.
> 
> >I do not know the Aztek solver, but a short glance at the user guide
> >revealed that it uses GMRes to solver you system.
> >
> >As you use the GradientSolver of Dune you are kind of comparing a
> >sandwiches with three-course meals.
> That's right, I am sorry. I make a better comparison with the same mesh 
> like yesterday:
> Trilinos with Jacobi and CG:  2 sec, 40 iteratrions residual: 1.05e-8
> Dune     with Jacobi and CG: 30 sec, 40 iteratrions residual: 1.05e-8
> And I don't forget a '0' for trilinos!
>

Did you compile Dune with optimization CXXFLAGS="-O3 -DNDEBUG" and
without setting DUNE_ISTL_WITH_CHECKING?

Markus