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master_element_info_per_processor.cc
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/**
* @file master_element_info_per_processor.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Wed Mar 16 2016
* @date last modification: Thu Nov 12 2020
*
* @brief Helper class to distribute a mesh
*
*
* @section LICENSE
*
* Copyright (©) 2016-2021 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "aka_iterators.hh"
#include "communicator.hh"
#include "element_group.hh"
#include "element_info_per_processor.hh"
#include "element_synchronizer.hh"
#include "mesh_iterators.hh"
#include "mesh_utils.hh"
/* -------------------------------------------------------------------------- */
#include <algorithm>
#include <iostream>
#include <map>
#include <tuple>
/* -------------------------------------------------------------------------- */
namespace akantu {
/* -------------------------------------------------------------------------- */
MasterElementInfoPerProc::MasterElementInfoPerProc(
ElementSynchronizer & synchronizer, Int message_cnt, Int root,
ElementType type, const MeshPartition & partition)
: ElementInfoPerProc(synchronizer, message_cnt, root, type),
partition(partition), all_nb_local_element(Vector<Int>::Zero(nb_proc)),
all_nb_ghost_element(Vector<Int>::Zero(nb_proc)),
all_nb_element_to_send(Vector<Int>::Zero(nb_proc)) {
Vector<Int> size(5);
size(0) = (Int)type;
if (type != _not_defined) {
nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
nb_element = mesh.getNbElement(type);
const auto & partition_num =
this->partition.getPartition(this->type, _not_ghost);
const auto & ghost_partition =
this->partition.getGhostPartitionCSR()(this->type, _not_ghost);
for (Int el = 0; el < nb_element; ++el) {
this->all_nb_local_element[partition_num(el)]++;
for (auto part = ghost_partition.begin(el);
part != ghost_partition.end(el); ++part) {
this->all_nb_ghost_element[*part]++;
}
this->all_nb_element_to_send[partition_num(el)] +=
ghost_partition.getNbCols(el) + 1;
}
/// tag info
auto && tag_names = this->mesh.getTagNames(type);
this->nb_tags = tag_names.size();
size(4) = nb_tags;
for (Int p = 0; p < nb_proc; ++p) {
if (p != root) {
size(1) = this->all_nb_local_element[p];
size(2) = this->all_nb_ghost_element[p];
size(3) = this->all_nb_element_to_send[p];
AKANTU_DEBUG_INFO(
"Sending connectivities informations to proc "
<< p << " TAG("
<< Tag::genTag(this->rank, this->message_count, Tag::_sizes)
<< ")");
comm.send(size, p,
Tag::genTag(this->rank, this->message_count, Tag::_sizes));
} else {
this->nb_local_element = this->all_nb_local_element[p];
this->nb_ghost_element = this->all_nb_ghost_element[p];
}
}
} else {
for (Int p = 0; p < this->nb_proc; ++p) {
if (p != this->root) {
AKANTU_DEBUG_INFO(
"Sending empty connectivities informations to proc "
<< p << " TAG("
<< Tag::genTag(this->rank, this->message_count, Tag::_sizes)
<< ")");
comm.send(size, p,
Tag::genTag(this->rank, this->message_count, Tag::_sizes));
}
}
}
}
/* ------------------------------------------------------------------------ */
void MasterElementInfoPerProc::synchronizeConnectivities() {
const auto & partition_num =
this->partition.getPartition(this->type, _not_ghost);
const auto & ghost_partition =
this->partition.getGhostPartitionCSR()(this->type, _not_ghost);
std::vector<Array<Idx>> buffers(this->nb_proc);
const auto & connectivities =
this->mesh.getConnectivity(this->type, _not_ghost);
/// copying the local connectivity
for (auto && part_conn :
zip(partition_num,
make_view(connectivities, this->nb_nodes_per_element))) {
auto && part = std::get<0>(part_conn);
auto && conn = std::get<1>(part_conn);
for (Int i = 0; i < conn.size(); ++i) {
buffers[part].push_back(conn[i]);
}
}
/// copying the connectivity of ghost element
for (auto && tuple :
enumerate(make_view(connectivities, this->nb_nodes_per_element))) {
auto && el = std::get<0>(tuple);
auto && conn = std::get<1>(tuple);
for (auto part = ghost_partition.begin(el); part != ghost_partition.end(el);
++part) {
auto proc = *part;
for (Int i = 0; i < conn.size(); ++i) {
buffers[proc].push_back(conn[i]);
}
}
}
#ifndef AKANTU_NDEBUG
for (auto p : arange(this->nb_proc)) {
auto size = this->nb_nodes_per_element *
(this->all_nb_local_element[p] + this->all_nb_ghost_element[p]);
AKANTU_DEBUG_ASSERT(
Int(buffers[p].size()) == size,
"The connectivity data packed in the buffer are not correct");
}
#endif
/// send all connectivity and ghost information to all processors
std::vector<CommunicationRequest> requests;
for (auto p : arange(this->nb_proc)) {
if (p == this->root) {
continue;
}
auto && tag =
Tag::genTag(this->rank, this->message_count, Tag::_connectivity);
AKANTU_DEBUG_INFO("Sending connectivities to proc " << p << " TAG(" << tag
<< ")");
requests.push_back(comm.asyncSend(buffers[p], p, tag));
}
auto & old_nodes = this->getNodesGlobalIds();
/// create the renumbered connectivity
AKANTU_DEBUG_INFO("Renumbering local connectivities");
MeshUtils::renumberMeshNodes(mesh, buffers[root], all_nb_local_element[root],
all_nb_ghost_element[root], type, old_nodes);
MeshAccessor mesh_accessor(mesh);
auto & ghost_counter = mesh_accessor.getGhostsCounters(type, _ghost);
ghost_counter.resize(nb_ghost_element, 1);
Communicator::waitAll(requests);
Communicator::freeCommunicationRequest(requests);
}
/* ------------------------------------------------------------------------ */
void MasterElementInfoPerProc::synchronizePartitions() {
const auto & partition_num =
this->partition.getPartition(this->type, _not_ghost);
const auto & ghost_partition =
this->partition.getGhostPartitionCSR()(this->type, _not_ghost);
std::vector<Array<Int>> buffers(this->partition.getNbPartition());
/// splitting the partition information to send them to processors
Vector<Int> count_by_proc(Vector<Int>::Zero(nb_proc));
for (Idx el = 0; el < nb_element; ++el) {
auto proc = partition_num(el);
buffers[proc].push_back(ghost_partition.getNbCols(el));
Int i(0);
for (auto part = ghost_partition.begin(el); part != ghost_partition.end(el);
++part, ++i) {
buffers[proc].push_back(*part);
}
}
for (Idx el = 0; el < nb_element; ++el) {
Int i(0);
for (auto part = ghost_partition.begin(el); part != ghost_partition.end(el);
++part, ++i) {
buffers[*part].push_back(partition_num(el));
}
}
#ifndef AKANTU_NDEBUG
for (Int p = 0; p < this->nb_proc; ++p) {
AKANTU_DEBUG_ASSERT(buffers[p].size() == (this->all_nb_ghost_element[p] +
this->all_nb_element_to_send[p]),
"Data stored in the buffer are most probably wrong");
}
#endif
std::vector<CommunicationRequest> requests;
/// last data to compute the communication scheme
for (Int p = 0; p < this->nb_proc; ++p) {
if (p == this->root) {
continue;
}
auto && tag =
Tag::genTag(this->rank, this->message_count, Tag::_partitions);
AKANTU_DEBUG_INFO("Sending partition informations to proc " << p << " TAG("
<< tag << ")");
requests.push_back(comm.asyncSend(buffers[p], p, tag));
}
if (Mesh::getSpatialDimension(this->type) ==
this->mesh.getSpatialDimension()) {
AKANTU_DEBUG_INFO("Creating communications scheme");
this->fillCommunicationScheme(buffers[this->rank]);
}
Communicator::waitAll(requests);
Communicator::freeCommunicationRequest(requests);
}
/* -------------------------------------------------------------------------- */
void MasterElementInfoPerProc::synchronizeTags() {
AKANTU_DEBUG_IN();
if (this->nb_tags == 0) {
AKANTU_DEBUG_OUT();
return;
}
/// tag info
auto tag_names = mesh.getTagNames(type);
// Make sure the tags are sorted (or at least not in random order),
// because they come from a map !!
std::sort(tag_names.begin(), tag_names.end());
// Sending information about the tags in mesh_data: name, data type and
// number of components of the underlying array associated to the current
// type
DynamicCommunicationBuffer mesh_data_sizes_buffer;
for (auto && tag_name : tag_names) {
mesh_data_sizes_buffer << tag_name;
mesh_data_sizes_buffer << mesh.getTypeCode(tag_name);
mesh_data_sizes_buffer << mesh.getNbComponent(tag_name, type);
}
AKANTU_DEBUG_INFO(
"Broadcasting the size of the information about the mesh data tags: ("
<< mesh_data_sizes_buffer.size() << ").");
AKANTU_DEBUG_INFO(
"Broadcasting the information about the mesh data tags, addr "
<< (void *)mesh_data_sizes_buffer.data());
comm.broadcast(mesh_data_sizes_buffer, root);
if (mesh_data_sizes_buffer.empty()) {
return;
}
// Sending the actual data to each processor
std::vector<DynamicCommunicationBuffer> buffers(nb_proc);
// Loop over each tag for the current type
for (auto && tag_name : tag_names) {
// Type code of the current tag (i.e. the tag named *names_it)
this->fillTagBuffer(buffers, tag_name);
}
std::vector<CommunicationRequest> requests;
for (Int p = 0; p < nb_proc; ++p) {
if (p == root) {
continue;
}
auto && tag = Tag::genTag(this->rank, this->message_count, Tag::_mesh_data);
AKANTU_DEBUG_INFO("Sending " << buffers[p].size()
<< " bytes of mesh data to proc " << p
<< " TAG(" << tag << ")");
requests.push_back(comm.asyncSend(buffers[p], p, tag));
}
// Loop over each tag for the current type
for (auto && tag_name : tag_names) {
// Reinitializing the mesh data on the master
this->fillMeshData(buffers[root], tag_name, mesh.getTypeCode(tag_name),
mesh.getNbComponent(tag_name, type));
}
Communicator::waitAll(requests);
Communicator::freeCommunicationRequest(requests);
requests.clear();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
template <typename T>
void MasterElementInfoPerProc::fillTagBufferTemplated(
std::vector<DynamicCommunicationBuffer> & buffers,
const std::string & tag_name) {
const auto & data = mesh.getElementalDataArray<T>(tag_name, type);
const auto & partition_num =
this->partition.getPartition(this->type, _not_ghost);
const auto & ghost_partition =
this->partition.getGhostPartitionCSR()(this->type, _not_ghost);
// Not possible to use the iterator because it potentially triggers the
// creation of complex
// type templates (such as akantu::Vector< std::vector<Element> > which don't
// implement the right interface
// (e.g. operator<< in that case).
// typename Array<T>::template const_iterator< Vector<T> > data_it =
// data.begin(data.getNbComponent());
// typename Array<T>::template const_iterator< Vector<T> > data_end =
// data.end(data.getNbComponent());
const auto * data_it = data.data();
const auto * data_end = data.data() + data.size() * data.getNbComponent();
const auto * part = partition_num.data();
/// copying the data, element by element
for (; data_it != data_end; ++part) {
for (Int j(0); j < data.getNbComponent(); ++j, ++data_it) {
buffers[*part] << *data_it;
}
}
data_it = data.data();
/// copying the data for the ghost element
for (Idx el(0); data_it != data_end; data_it += data.getNbComponent(), ++el) {
auto it = ghost_partition.begin(el);
auto end = ghost_partition.end(el);
for (; it != end; ++it) {
auto proc = *it;
for (Int j(0); j < data.getNbComponent(); ++j) {
buffers[proc] << data_it[j];
}
}
}
}
/* -------------------------------------------------------------------------- */
void MasterElementInfoPerProc::fillTagBuffer(
std::vector<DynamicCommunicationBuffer> & buffers,
const std::string & tag_name) {
#define AKANTU_DISTRIBUTED_SYNHRONIZER_TAG_DATA(r, extra_param, elem) \
case MeshDataTypeCode::BOOST_PP_TUPLE_ELEM(2, 0, elem): { \
this->fillTagBufferTemplated<BOOST_PP_TUPLE_ELEM(2, 1, elem)>(buffers, \
tag_name); \
break; \
}
MeshDataTypeCode data_type_code = mesh.getTypeCode(tag_name);
switch (data_type_code) {
BOOST_PP_SEQ_FOR_EACH(AKANTU_DISTRIBUTED_SYNHRONIZER_TAG_DATA, ,
AKANTU_MESH_DATA_TYPES)
default:
AKANTU_ERROR("Could not obtain the type of tag" << tag_name << "!");
break;
}
#undef AKANTU_DISTRIBUTED_SYNHRONIZER_TAG_DATA
}
/* -------------------------------------------------------------------------- */
void MasterElementInfoPerProc::synchronizeGroups() {
AKANTU_DEBUG_IN();
std::vector<DynamicCommunicationBuffer> buffers(nb_proc);
using ElementToGroup = std::vector<std::vector<std::string>>;
ElementToGroup element_to_group(nb_element);
for (auto & eg : mesh.iterateElementGroups()) {
const auto & name = eg.getName();
for (const auto & element : eg.getElements(type, _not_ghost)) {
element_to_group[element].push_back(name);
}
eg.clear(type, _not_ghost);
}
const auto & partition_num =
this->partition.getPartition(this->type, _not_ghost);
const auto & ghost_partition =
this->partition.getGhostPartitionCSR()(this->type, _not_ghost);
/// copying the data, element by element
for (auto && pair : zip(partition_num, element_to_group)) {
buffers[std::get<0>(pair)] << std::get<1>(pair);
}
/// copying the data for the ghost element
for (auto && pair : enumerate(element_to_group)) {
auto && el = std::get<0>(pair);
auto it = ghost_partition.begin(el);
auto end = ghost_partition.end(el);
for (; it != end; ++it) {
auto proc = *it;
buffers[proc] << std::get<1>(pair);
}
}
std::vector<CommunicationRequest> requests;
for (Int p = 0; p < this->nb_proc; ++p) {
if (p == this->rank) {
continue;
}
auto && tag = Tag::genTag(this->rank, p, Tag::_element_group);
AKANTU_DEBUG_INFO("Sending element groups to proc " << p << " TAG(" << tag
<< ")");
requests.push_back(comm.asyncSend(buffers[p], p, tag));
}
this->fillElementGroupsFromBuffer(buffers[this->rank]);
Communicator::waitAll(requests);
Communicator::freeCommunicationRequest(requests);
requests.clear();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
} // namespace akantu

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