On 1/24/20 11:52 AM, Jonathan Russ wrote:
>
> Since you asked I decided to time each thing individually that I
> commented out to make sure I knew which function call was taking so
> long. It turns out that I was incorrect before when I said that
> extract_constant_modes was slow. I was
Professor Bangerth -
Thank you for your reply, however, I just seemed to have solved my problem.
I had a block system with one vector valued field and one scalar valued
field. When I extract the constant modes for the vector valued field it is
very fast (using the vector component mask).
On 1/23/20 5:00 PM, Jonathan Russ wrote:
>
> I noticed that the Trilinos ML preconditioner accessed through the
> TrilinosWrappers benefits heavily from supplying the constant modes or
> the null-space of the laplace operator. Using the extract_constant_modes
> functionality I notice that this
Hello -
I noticed that the Trilinos ML preconditioner accessed through the
TrilinosWrappers benefits heavily from supplying the constant modes or the
null-space of the laplace operator. Using the extract_constant_modes
functionality I notice that this can take quite a bit of time for a vector
