[Dune-devel] Parallel solvers in dune-istl

[Martin Nolte]

Hi Oli,

The dune-istl solvers print verbose information on every rank you ask it to. If
you pass in verbose = 2*(rank == 0), you will end up with the desired result. I
checked the solvers and the implementation does not require verbose to be equal
on all ranks. I cannot, however, tell you whether this behavior is specified or
intended in any way.

Best,

Martin

On 01/08/2018 02:27 PM, Oliver Sander wrote:
> Dear dune,
> 
> I am trying to implement a distributed Poisson solver using only
> dune-grid and dune-istl.  The algorithm shall be a preconditioned
> CG method.  My current understanding of dune-istl is that I should
> use the standard CGSolver implementation for this, and parallelization
> happens in dedicated ScalarProduct, Preconditioner, and LinearOperator
> implementations.  This approach works, but the CGSolver class prints
> all information about the current residual, estimated conv rate etc.
> on _all_ processes. Is this the expected behavior?  Why?  It gets
> annoying pretty quickly.
> 
> Did anybody else ever implement a Poisson solver using only dune-istl
> and dune-grid?  My own works, but it does not look very natural to me.
> I would appreciate a look at alternative implementations.
> 
> Thanks,
> Oliver
> 
> 
> 
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-- 
Dr. Martin Nolte <nolte at mathematik.uni-freiburg.de>

Universität Freiburg                                   phone: +49-761-203-5630
Abteilung für angewandte Mathematik                    fax:   +49-761-203-5632
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79104 Freiburg, Germany