Re: [Libmesh-users] Lagrange Convergence - Finish line

[Roy S. <ro...@st...>]

On Fri, 11 Jul 2008, Maxime Debon wrote:

> Using the example 0 was the good trick, I finally found that even with a 
> simple ODE problem, the maximum number of solver iterations was important ...
>
>
> // -----------------------------------------------------------------------
> equation_systems.parameters.set<unsigned int>
>                            ("linear solver maximum iterations") = 1000;
> // -----------------------------------------------------------------------
>
> So, the problem disappears with an higher max. number or putting the line as 
> a comment.

Whew!

Good to know it wasn't a bug, at least.  I'm surprised that the
quadratic Lagrange elements turned out to be the choice that needed
the most solver iterations, though.  Even more than cubic Hermites!

Personally I set the max iteration count ridiculously high when I'm
solving a linear problem; unless you've got a nonlinear solver that
will take more outer iterations to cover up for a bad linear solve, a
bad solution is usually worse than no solution at all.
---
Roy