On 1/16/22 6:25 AM, Raghunandan Pratoori wrote:
Thanks for your reply. I use DoFRenumbering with
parallel::distributed::Triangulation and it works for me. I wanted to know why
it was not used in step-40. Is it that the improvement observed vs the time
taken for renumbering does not make it worth using it in this specific case?
For scalar problems such as the one solved in step-40, the order of unknowns
really does not matter to the solver, but it may matter to preconditioners. It
does not matter for the algebraic or geometric multigrid preconditioners we
use for elliptic problems, so there is no benefit in step-40.
The only places where renumbering really matters is for advection-dominated
problems solved with a preconditioner such as Gauss-Seidel or (S)SOR.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
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