Thanks. Barry.
On Tue, Dec 12, 2017 at 2:03 PM, Smith, Barry F. <[email protected]> wrote: > > > > On Dec 12, 2017, at 12:04 PM, Hao Zhang <[email protected]> wrote: > > > > hi, > > > > before I introduce HYPRE with BOOMERAMG to my CFD code, I will have > output with good convergence rate. with BOOMERAMG, the same code will take > longer time to run and there's a good chance that no output will be > produced whatsoever. > > Are you running with -ksp_monitor -ksp_view_pre -ksp_converged_reason ? > > If you are using -ksp_monitor and getting no output it could be that > hypre is taking a very long time to form the AMG preconditioner, but I > won't expect to see this unless the problem is very very big. > > You can always run with -start_in_debugger and then type cont in the > debugger wait a couple minutes and then use control C in the debugger and > type where to determine what it is doing at the time (you can email the > output to [email protected]). > > Boomeramg is not good for all classes of matrices, it is fine for > elliptic/parabolic generally but if you hand it something that is > hyperbolically dominated it will not work well. > > Barry > > > > > what happened? thanks! > > > > -- > > Hao Zhang > > Dept. of Applid Mathematics and Statistics, > > Stony Brook University, > > Stony Brook, New York, 11790 > > -- Hao Zhang Dept. of Applid Mathematics and Statistics, Stony Brook University, Stony Brook, New York, 11790
