[Trilinos-Users] [EXTERNAL] NOX - unused parameters when creating an ifpack preconditioner?

[Pawlowski, Roger P]

Hi Sean,

NOX was written before parameter list validation existed.  Therefore, parameters are not accessed until actually needed during runtime.  So printing the NOX parameter list before the run, will result in many unused parameters.  To make sure a parameter is used, print the parameter list after nox completes the solve.  NOX has not been updated to do parameter list validation, but we plan to fix this in the next few months.  

Information on setting preconditioner parameters can be found on the page:
http://trilinos.sandia.gov/packages/docs/dev/packages/nox/doc/html/classNOX_1_1Epetra_1_1LinearSystemAztecOO.html

Roger

________________________________________
From: trilinos-users-bounces at software.sandia.gov [trilinos-users-bounces at software.sandia.gov] on behalf of Sean C McDuffee [scmcduff at blueskystudios.com]
Sent: Wednesday, September 26, 2012 4:11 PM
To: nox-users at software.sandia.gov; trilinos-users at software.sandia.gov
Subject: [EXTERNAL] [Trilinos-Users] NOX - unused parameters when creating an ifpack    preconditioner?

I'm using an Aztec GMRES solver for my linear solve and try to set a
"New Ifpack" preconditioner with the amesos_Klu solver but all the
parameters, including the solver type say unused after them in the NOX
output - and my Nonlinear solver is not converging so I'm thinking the
preconditioner is poor (non-existent?).  Can anybody help?

Thanks,
Sean

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