[petsc-users] [EXTERNAL] Re: Question about SuperLU

[Xiaoye S. Li]

Can you write down (in matrix notation) what does full VB matrix look like?

Sherry

On Mon, Jun 13, 2022 at 6:20 PM Tang, Qi <tangqi at msu.edu> wrote:

> Sherry,
>
> -mat_superlu_dist_replacetinypivot
> This flag makes superlu_dist back to working for the full VB block as we
> would think. Thanks again for the suggestion.
>
> Does this imply anything for the VB block matrix? Are we just unlucky or
> does that imply we have tiny terms along the diagonal and the matrix is not
> very good? (It could be the case since it is a stablized saddle point
> problem.) Again, we estimate the condition number through petsc and it is
> reasonable.
>
> Qi
>
>
> On Jun 10, 2022, at 6:35 PM, Xiaoye S. Li <xsli at lbl.gov> wrote:
>
> -mat_superlu_dist_replacetinypivot
>
>
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