[Trilinos-Users] ML

[Thomas George]

Hi Jonathan,

Thanks for the reply. Does this mean that even though I wanted it to use 
  the SA parameters, ML has just decided on its own that there were 
better parameters and ignored my suggestions or is it that my 
suggestions didn't get transmitted properly? Please let me know. Thanks.

-Thomas


Jonathan Hu wrote:
> 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);
>>    
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