[petsc-users] how to reuse Mumps factorization

[Matthew Knepley]

On Wed, Oct 19, 2022 at 9:13 AM 袁煕 <yuanxi at advancesoft.jp> wrote:

> Hello,
>
> I am using Mumps to solve a problem with multiple time steps. The matrix
> structure does not change  but its value may or may not change  during
> those steps. That means I should reuse the symbolic factorization but
> recall numeric factorization when needed.
>
> I have found the following anwser of a similar question
> https://lists.mcs.anl.gov/pipermail/petsc-users/2020-August/041846.html
>
> which says "it automatically uses the same factorization", but I don't
> know if it includes numerical factorization also.
>
> My question is :
> 1. Does numeric factorization do automatically? If not
>

Yes.

  Thanks,

     Matt


> 2. Could I control when numeric factorization should be done and how to
> do it?
>
> Much thanks
>
> YUAN
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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