[Trilinos-Users] [EXTERNAL] ilut

Bradley, Andrew Michael ambradl at sandia.gov
Fri Jan 22 13:24:07 EST 2016

Hi Danielle,

1. What happens if you do not use a preconditioner at all?

2. Have you verified in the 1,2,4-proc cases that the output solutions all agree?



From: Trilinos-Users <trilinos-users-bounces at trilinos.org> on behalf of Danielle Catherine Maddix <dcmaddix at stanford.edu>
Sent: Friday, January 22, 2016 11:20 AM
To: trilinos-users at trilinos.org
Subject: [EXTERNAL] [Trilinos-Users] ilut


I am solving a FSI finite element matrix vector system.  I am using GMRES with glut in AztecOO.  It appropriately solves it for 1,2 and 4 processors on my local machine, which with 3 processors it cannot bring the residual down below 1e-1.  I was wondering if this could be an issue with the ilut preconditioner, since it says convergence depends on the domain decomposition, or if it is possible there is a bug in my code?


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