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MGTransferGlobalCoarsening::initialize_dof_vector() skip zeroing #13539

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Mar 15, 2022
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MGTransferGlobalCoarsening::initialize_dof_vector() skip zeroing #13539

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68 changes: 35 additions & 33 deletions include/deal.II/multigrid/mg_transfer_global_coarsening.h
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Original file line number Diff line number Diff line change
Expand Up @@ -597,15 +597,22 @@ class MGTransferGlobalCoarsening : public dealii::MGTransferBase<VectorType>
memory_consumption() const;

private:
/**
* Function to initialize internal level vectors.
*/
void
initialize_dof_vector(const unsigned int level, VectorType &vector) const;

/**
* Collection of the two-level transfer operators.
*/
MGLevelObject<MGTwoLevelTransfer<dim, VectorType>> transfer;

/**
* Function to initialize internal level vectors.
* External partitioners used during initialize_dof_vector().
*/
std::function<void(const unsigned int, VectorType &)> initialize_dof_vector;
std::vector<std::shared_ptr<const Utilities::MPI::Partitioner>>
external_partitioners;
};


Expand All @@ -623,7 +630,7 @@ MGTransferGlobalCoarsening<dim, VectorType>::MGTransferGlobalCoarsening(
&initialize_dof_vector)
: transfer(transfer)
{
build(initialize_dof_vector);
this->build(initialize_dof_vector);
}


Expand All @@ -634,28 +641,19 @@ MGTransferGlobalCoarsening<dim, VectorType>::build(
const std::vector<std::shared_ptr<const Utilities::MPI::Partitioner>>
&external_partitioners)
{
if (external_partitioners.size() > 0)
{
Assert(
this->initialize_dof_vector == nullptr,
ExcMessage(
"A initialize_dof_vector function has already been registered in the constructor!"));
this->external_partitioners = external_partitioners;

if (this->external_partitioners.size() > 0)
{
const unsigned int min_level = transfer.min_level();
const unsigned int max_level = transfer.max_level();

AssertDimension(external_partitioners.size(), transfer.n_levels());

this->initialize_dof_vector =
[external_partitioners, min_level](
const unsigned int level,
LinearAlgebra::distributed::Vector<typename VectorType::value_type>
&vec) { vec.reinit(external_partitioners[level - min_level]); };
AssertDimension(this->external_partitioners.size(), transfer.n_levels());

for (unsigned int l = min_level + 1; l <= max_level; ++l)
transfer[l].enable_inplace_operations_if_possible(
external_partitioners[l - 1 - min_level],
external_partitioners[l - min_level]);
this->external_partitioners[l - 1 - min_level],
this->external_partitioners[l - min_level]);
}
}

Expand Down Expand Up @@ -684,7 +682,7 @@ MGTransferGlobalCoarsening<dim, VectorType>::build(
external_partitioners[l - min_level] = vector.get_partitioner();
}

build(external_partitioners);
this->build(external_partitioners);
}
else
{
Expand All @@ -694,6 +692,24 @@ MGTransferGlobalCoarsening<dim, VectorType>::build(



template <int dim, typename VectorType>
void
MGTransferGlobalCoarsening<dim, VectorType>::initialize_dof_vector(
const unsigned int level,
VectorType & vec) const
{
AssertDimension(transfer.n_levels(), external_partitioners.size());
AssertIndexRange(level, transfer.max_level() + 1);

const auto &external_partitioner =
external_partitioners[level - transfer.min_level()];

if (vec.get_partitioner().get() != external_partitioner.get())
vec.reinit(external_partitioner);
}



template <int dim, typename VectorType>
void
MGTransferGlobalCoarsening<dim, VectorType>::prolongate(
Expand Down Expand Up @@ -741,13 +757,6 @@ MGTransferGlobalCoarsening<dim, VectorType>::copy_to_mg(
{
(void)dof_handler;

Assert(
initialize_dof_vector,
ExcMessage(
"To be able to use this function, a function to initialize an internal "
"DoF vector has to be provided in the constructor of "
"MGTransferGlobalCoarsening."));

for (unsigned int level = dst.min_level(); level <= dst.max_level(); ++level)
{
initialize_dof_vector(level, dst[level]);
Expand Down Expand Up @@ -783,13 +792,6 @@ MGTransferGlobalCoarsening<dim, VectorType>::interpolate_to_mg(
MGLevelObject<VectorType> &dst,
const InVector & src) const
{
Assert(
initialize_dof_vector,
ExcMessage(
"To be able to use this function, a function to initialize an internal "
"DoF vector has to be provided in the constructor of "
"MGTransferGlobalCoarsening."));

const unsigned int min_level = transfer.min_level();
const unsigned int max_level = transfer.max_level();

Expand Down