Step-32 and step-50 are important for parallelization of TrilinosWrappered
data type.
For someone has to write codes with Trilinos data type, here are necessary
modification
from serial to parallel programs:
1. Change triangulation to parallel::distributed::triangulation rather
than
GridTools::partition_triangulation()
<https://www.dealii.org/current/doxygen/deal.II/namespaceGridTools.html#a99eba8e3b388258eda37a2724579dd1d>
or parallel::shared::Triangulation
<https://www.dealii.org/current/doxygen/deal.II/classparallel_1_1shared_1_1Triangulation.html>
.
2. SparsityPattern and solution/rhs Vector initialization specified for
Trilinos, see Step-42
3. Choose locally owned cells or level cells during assembling.
Though they both allow parallel, step-42's DoFTools::make_sparsity_pattern
<https://www.dealii.org/current/doxygen/deal.II/group__constraints.html#gaf78e864edbfba7e0a7477457bfb96b26>
has
better performance
in matrix LU decomposition (30%-50% less time) than tep-50's.
However another problem pops out. When test a vector-valued problem,
renumber DoFs
component wise make reinit of vectors fail. If
DoFRenumbering::component_wise is called,
1. LinearAlgebra::distributed::Vector<double>
v1(dof_handler.locally_owned_dofs(),
mpi_communicator); v1.reinit(dof_handler.locally_owned_dofs(),
mpi_communicator);
Success
2. LinearAlgebra::distributed::Vector<double> v2;
v2.reinit(dof_handler.locally_owned_dofs(), mpi_communicator);
Fails.
Is that relates to trilinos date type?
在2023年2月23日星期四 UTC+8 22:44:57<Wolfgang Bangerth> 写道：
> On 2/23/23 07:42, 'yy.wayne' via deal.II User Group wrote:
> > So if step-4 doesn't support parallel then what I got is reasonable.
>
> Correct.
> W.
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: bang...@colostate.edu
> www: http://www.math.colostate.edu/~bangerth/
>
>
>
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