Re: [Libmesh-users] Question regarding Subdivision Implementation in libMesh

[Lee, J. H. <jae...@li...>]

I used -ksp_type cg -pc_type icc -pc_factor_shift_type positive_definite, but this takes ~300 iterations.

> On May 2, 2018, at 12:52 PM, Roy Stogner <roy...@ic...> wrote:
> 
> 
> On Tue, 1 May 2018, Lee, Jae Ho wrote:
> 
>> Actually, this issue is now resolved. The problem was that the
>> default linear solver was not converging. This issue can be resolved
>> by using a stronger linear solver.
> 
> Thanks for the update!
> 
> You had me worried at first - I don't think any of the most active
> developers are currently doing anything with subdivision elements,
> which is exactly the sort of situation where regressions are a risk.
> Good to hear that wasn't the case.
> 
> How far in the "stronger linear solver" direction did you have to go?
> Stronger tolerance(s); stronger preconditioner; direct instead of
> iterative?
> ---
> Roy