Dear Bruno, Indeed, it appears that one isn't able to change the settings passed to the AMG preconditioner other than those set by the AdditionalData object. Your only current alternative is to create the Teuchos::ParameterList yourself, which you can send in to the call to initialize() instead of the AdditionalData object.
This is, in general, not an optimal solution, as choosing the correct settings for the preconditioner is not trivial. So I’ve opened this PR to (hopefully) give the solution that you were hoping for. https://github.com/dealii/dealii/pull/7793 <https://github.com/dealii/dealii/pull/7793> Best, Jean-Paul > On 08 Mar 2019, at 17:26, Bruno Blais <blais.br...@gmail.com> wrote: > > Hello everyone, > Just a small question. > Looking at the documentation and at the .h of the > TrilinosWrappers::PreconditionAMG I have not found a way to access the > smoother and coarse solver to play with their parameters. Say if you use an > ILU or ILUT smoother. > When you use the verbose output of the solver you get status report such as: > > Smoother (level 2) : IFPACK, type=`ILU', > Smoother (level 2) : post,overlap=1 > Smoother (level 2) : level-of-fill=0,rel. threshold=1,abs. threshold=0 > Smoother (level 2) : Setup time : 0.00463979 (s) > > Coarse solve (level 3) : IFPACK, type=`ILU', > Coarse solve (level 3) : post,overlap=1 > Coarse solve (level 3) : level-of-fill=0,rel. threshold=1,abs. threshold=0 > > > Clearly, parameters like fill-level, rel. treshold and abs. threshold could > be modified. Is there any way to access them and modify them? I have not been > able to as of now. > > I would prefer to keep using the Wrappers as I find their usage to be > relatively easy and straightforward. > Thank you for everything, > Best > Bruno > > -- > The deal.II project is located at http://www.dealii.org/ > <http://www.dealii.org/> > For mailing list/forum options, see > https://groups.google.com/d/forum/dealii?hl=en > <https://groups.google.com/d/forum/dealii?hl=en> > --- > You received this message because you are subscribed to the Google Groups > "deal.II User Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to dealii+unsubscr...@googlegroups.com > <mailto:dealii+unsubscr...@googlegroups.com>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
