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Global coarsening: simplify the determination of weights #13064

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Dec 13, 2021
Merged

Global coarsening: simplify the determination of weights #13064

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24 changes: 7 additions & 17 deletions include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1031,6 +1031,12 @@ namespace internal
& transfer,
LinearAlgebra::distributed::Vector<Number> &touch_count)
{
touch_count.reinit(transfer.partitioner_fine);

for (const auto i : transfer.level_dof_indices_fine)
touch_count.local_element(i) += 1;
touch_count.compress(VectorOperation::add);

IndexSet locally_relevant_dofs;
if (mg_level_fine == numbers::invalid_unsigned_int)
DoFTools::extract_locally_relevant_dofs(dof_handler_fine,
Expand All @@ -1052,23 +1058,7 @@ namespace internal
LinearAlgebra::distributed::Vector<Number> touch_count_;
touch_count_.reinit(partitioner_fine_);

std::vector<types::global_dof_index> local_dof_indices;

loop_over_active_or_level_cells(
dof_handler_fine, mg_level_fine, [&](const auto &cell) {
local_dof_indices.resize(cell->get_fe().n_dofs_per_cell());

if (mg_level_fine == numbers::invalid_unsigned_int)
cell->get_dof_indices(local_dof_indices);
else
cell->get_mg_dof_indices(local_dof_indices);

for (auto i : local_dof_indices)
if (constraint_fine.is_constrained(i) == false)
touch_count_[i] += 1;
});

touch_count_.compress(VectorOperation::add);
touch_count_.copy_locally_owned_data_from(touch_count);

for (unsigned int i = 0; i < touch_count_.local_size(); ++i)
touch_count_.local_element(i) =
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