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Reduce the volume of communication somewhat. #14138

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Jul 16, 2022
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Reduce the volume of communication somewhat. #14138

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28 changes: 23 additions & 5 deletions source/distributed/shared_tria.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
// ---------------------------------------------------------------------

#include <deal.II/base/mpi.h>
#include <deal.II/base/mpi.templates.h>
#include <deal.II/base/utilities.h>

#include <deal.II/distributed/shared_tria.h>
Expand All @@ -27,6 +28,8 @@

#include <deal.II/lac/sparsity_tools.h>

#include <type_traits>


DEAL_II_NAMESPACE_OPEN

Expand Down Expand Up @@ -354,15 +357,30 @@ namespace parallel
// make sure that all refinement/coarsening flags are the same on all
// processes
{
std::vector<unsigned int> refinement_configurations(
this->n_active_cells() * 2, 0u);
// Obtain the type used to store the different possibilities
// a cell can be refined. This is a bit awkward because
// what `cell->refine_flag_set()` returns is a struct
// type, RefinementCase, which internally stores a
// std::uint8_t, which actually holds integers of
// enum type RefinementPossibilities<dim>::Possibilities.
// In the following, use the actual name of the enum, but
// make sure that it is in fact a `std::uint8_t` or
// equally sized type.
using int_type = std::underlying_type_t<
typename RefinementPossibilities<dim>::Possibilities>;
static_assert(sizeof(int_type) == sizeof(std::uint8_t),
"Internal type mismatch.");

std::vector<int_type> refinement_configurations(this->n_active_cells() *
2,
int_type(0));
for (const auto &cell : this->active_cell_iterators())
if (cell->is_locally_owned())
{
refinement_configurations[cell->active_cell_index() * 2 + 0] =
cell->refine_flag_set();
static_cast<int_type>(cell->refine_flag_set());
refinement_configurations[cell->active_cell_index() * 2 + 1] =
cell->coarsen_flag_set();
static_cast<int_type>(cell->coarsen_flag_set() ? 1 : 0);
}

Utilities::MPI::max(refinement_configurations,
Expand All @@ -385,7 +403,7 @@ namespace parallel
ExcMessage(
"Refinement/coarsening flags of cells are not consistent in parallel!"));

if (refinement_configurations[cell->active_cell_index() * 2 + 0] >
if (refinement_configurations[cell->active_cell_index() * 2 + 0] !=
0)
cell->set_refine_flag(RefinementCase<dim>(
refinement_configurations[cell->active_cell_index() * 2 + 0]));
Expand Down