[Trilinos-Users] ML

[Jonathan Hu]

Thomas,

   This is not an error or bug, simply a warning that certain parameters 
were set but not used.  This check is done when the method 
MLPrec->PrintUnused(0) is invoked after you've created the ML 
preconditioner.

Regards,
Jonathan


>
> Today's Topics:
>
>    1. ML (Thomas George)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 12 Jan 2009 10:16:33 -0600
> From: "Thomas George" <tgeorge at cs.tamu.edu>
> Subject: [Trilinos-Users] ML
> To: Trilinos <Trilinos-Users at software.sandia.gov>
> Message-ID: <496B6CE1.6080206 at cs.tamu.edu>
> Content-Type: text/plain; charset=iso-8859-1; format=flowed
>
> Hi,
>
> I am trying to use ML along with Belos with the default SA or DD 
> parameters as described in the user guide. However, I do get the 
> following message.  Depending on the default setting I use I get 
> different warnings for SA, DD etc. I didn't have a statement to use 
> smoother "ifpack list" in my code at all. Is this a bug in my code? I am 
> using version 8.03.
>
> ------------------------------------------------------------------------------
> Unused parameters:
> WARNING: Parameter "default values" SA   [unused] is unused
> WARNING: Parameter "smoother: ifpack list"    [unused] is unused
> ------------------------------------------------------------------------------
>
>
>
>
> The snippet of code that tries to set the default is shown below and the 
> call to the preconditioner creation is also shown.
>
>   Teuchos::ParameterList List;
>
>     if(PrecType == "SA") {
>       cout<< " Setting default SA parameters " << endl ;
>       ML_Epetra::SetDefaults("SA",List) ;
>       List.set("smoother: type","symmetric Gauss-Seidel");
>      } else if(PrecType =="DD") {
>       cout<< " Setting default DD parameters " << endl ;
>       ML_Epetra::SetDefaults("DD",List) ;
>     } else if(PrecType =="DD-ML") {
>       cout<< " Setting default DD-ML parameters " << endl ;
>       ML_Epetra::SetDefaults("DD-ML",List) ;
>     } else {
>       cout << "Unknown default parameter setting " << PrecType << endl ;
>       MPI_Finalize() ;
>       exit (-1) ;
>     }
>     // overwrite some parameters. Please refer to the user's guide
>     // for more information
>     // some of the parameters do not differ from their default value,
>     // and they are here reported for the sake of clarity
>    
>     // output level, 0 being silent and 10 verbose
>     List.set("output", verbose) ;
>     List.set("max levels", maxLevels) ;
>     List.set("smoother: sweeps", smoothSweeps) ;
>     List.set("coarse: max size", maxCoarseSize) ;
>
>
>     cmembytes1(&mem1);
>     start = MPI_Wtime() ;
>     RCP<ML_Epetra::MultiLevelPreconditioner> Prec = Teuchos::rcp(new 
> ML_Epetra::
> MultiLevelPreconditioner(*A, List)) ;
>     assert(Prec != Teuchos::null) ;
>     // verify unused parameters on process 0 put -1 to print on all
>     // processes
>     Prec->PrintUnused(0);
>