Try -pc_hypre_boomeramg_print_statistics in the console for more information regarding your AMG.
I believe that is the right syntax. I am not 100% though! It is a long time ago I touched it. With best regards, Shaman Mahmoudi On Jan 25, 2007, at 3:31 PM, Nicolas Bathfield wrote: > Dear Fernando, > > Thanks for your reply. > > I had notice the value maxlevels given by -ksp_view, but I did not > know > how to change this value. > > Still, as the default is 25 levels I think, I have no way to know > exactly > how many levels are used for a given case. > I can reformulate my question in this way: does boomeramg coarsen the > "grid" to the coarsest level possible, i.e. 1 cell over the domain, or > does it stop before that? (grid is not the right term when it comes to > algebraic multilevel methods, but I can't find any other clear way to > express it). How can I control the coarsening? > > Thinking about it, perhaps boomeramd actually refines the grid up > to the > maximum number of levels...Is it so? > > Thanks for your help. > > Nicolas > >> Nicolas, >> >> You should try the option -pc_hypre_boomeramg_max_levels in the line >> command. In order to see the level's details you can use the PESTc >> option >> -ksp_view. >> >> Best Regards >> >> Fernando. >> >> >> Em (11:15:45), petsc-users at mcs.anl.gov escreveu: >> >> >>> Hi Petsc users, >>> >>> I have a question regarding the use of Hypre and especially >>> Boomeramg. >>> How can we control the number of levels in the multigrid >>> algortihm? Can >>> we >>> chose it, or if not, can we display it in some way? >>> >>> Best regards, >>> >>> Nicolas. >>> >>> -- >>> Nicolas BATHFIELD >>> Chalmers University of Technology >>> Shipping and Marine Technology >>> phone: +46 (0)31 772 1476 >>> fax: +46 (0)31 772 3699 >>> >>> ---------- >> >> >> > > > -- > Nicolas BATHFIELD > Chalmers University of Technology > Shipping and Marine Technology > phone: +46 (0)31 772 1476 > fax: +46 (0)31 772 3699 >
