node_info_per_processor.cc
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Created: Thu, May 16, 03:34

node_info_per_processor.cc
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	/**
	* @file node_info_per_processor.cc
	*
	* @author Nicolas Richart <nicolas.richart@epfl.ch>
	*
	* @date creation: Wed Mar 16 2016
	* @date last modification: Wed Nov 08 2017
	*
	* @brief Please type the brief for file: Helper classes to create the
	* distributed synchronizer and distribute a mesh
	*
	* @section LICENSE
	*
	* Copyright (©) 2016-2018 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 "node_info_per_processor.hh"
	#include "communicator.hh"
	#include "node_group.hh"
	#include "node_synchronizer.hh"
	/* -------------------------------------------------------------------------- */
	#include <algorithm>
	/* -------------------------------------------------------------------------- */

	namespace akantu {

	/* -------------------------------------------------------------------------- */
	NodeInfoPerProc::NodeInfoPerProc(NodeSynchronizer & synchronizer,
	UInt message_cnt, UInt root)
	: MeshAccessor(synchronizer.getMesh()), synchronizer(synchronizer),
	comm(synchronizer.getCommunicator()), rank(comm.whoAmI()),
	nb_proc(comm.getNbProc()), root(root), mesh(synchronizer.getMesh()),
	spatial_dimension(synchronizer.getMesh().getSpatialDimension()),
	message_count(message_cnt) {}

	/* -------------------------------------------------------------------------- */
	void NodeInfoPerProc::synchronize() {
	synchronizeNodes();
	synchronizeTypes();
	synchronizeGroups();
	synchronizePeriodicity();
	synchronizeTags();
	}

	/* -------------------------------------------------------------------------- */
	template <class CommunicationBuffer>
	void NodeInfoPerProc::fillNodeGroupsFromBuffer(CommunicationBuffer & buffer) {
	AKANTU_DEBUG_IN();

	std::vector<std::vector<std::string>> node_to_group;

	buffer >> node_to_group;

	AKANTU_DEBUG_ASSERT(node_to_group.size() == mesh.getNbGlobalNodes(),
	"Not the good amount of nodes where transmitted");

	const auto & global_nodes = mesh.getGlobalNodesIds();

	for (auto && data : enumerate(global_nodes)) {
	for (const auto & node : node_to_group[std::get<1>(data)]) {
	mesh.getNodeGroup(node).add(std::get<0>(data), false);
	}
	}

	for (auto && ng_data : mesh.iterateNodeGroups()) {
	ng_data.optimize();
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void NodeInfoPerProc::fillNodesType() {
	AKANTU_DEBUG_IN();

	UInt nb_nodes = mesh.getNbNodes();
	auto & nodes_flags = this->getNodesFlags();

	Array<UInt> nodes_set(nb_nodes);
	nodes_set.set(0);

	enum NodeSet {
	NORMAL_SET = 1,
	GHOST_SET = 2,
	};

	Array<bool> already_seen(nb_nodes, 1, false);

	for (auto gt : ghost_types) {
	UInt set = NORMAL_SET;
	if (gt == _ghost)
	set = GHOST_SET;

	already_seen.set(false);
	for (auto && type :
	mesh.elementTypes(_all_dimensions, gt, _ek_not_defined)) {
	const auto & connectivity = mesh.getConnectivity(type, gt);

	for (auto & conn :
	make_view(connectivity, connectivity.getNbComponent())) {
	for (UInt n = 0; n < conn.size(); ++n) {
	AKANTU_DEBUG_ASSERT(conn(n) < nb_nodes,
	"Node " << conn(n)
	<< " bigger than number of nodes "
	<< nb_nodes);
	if (!already_seen(conn(n))) {
	nodes_set(conn(n)) += set;
	already_seen(conn(n)) = true;
	}
	}
	}
	}
	}

	nodes_flags.resize(nb_nodes);
	for (UInt i = 0; i < nb_nodes; ++i) {
	if (nodes_set(i) == NORMAL_SET)
	nodes_flags(i) = NodeFlag::_normal;
	else if (nodes_set(i) == GHOST_SET)
	nodes_flags(i) = NodeFlag::_pure_ghost;
	else if (nodes_set(i) == (GHOST_SET + NORMAL_SET))
	nodes_flags(i) = NodeFlag::_master;
	else {
	AKANTU_EXCEPTION("Gni ?");
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void NodeInfoPerProc::fillCommunicationScheme(const Array<UInt> & master_info) {
	AKANTU_DEBUG_IN();

	Communications<UInt> & communications =
	this->synchronizer.getCommunications();

	{ // send schemes
	auto it = master_info.begin_reinterpret(2, master_info.size() / 2);
	auto end = master_info.end_reinterpret(2, master_info.size() / 2);

	std::map<UInt, Array<UInt>> send_array_per_proc;

	for (; it != end; ++it) {
	const Vector<UInt> & send_info = *it;

	send_array_per_proc[send_info(0)].push_back(send_info(1));
	}

	for (auto & send_schemes : send_array_per_proc) {
	auto & scheme = communications.createSendScheme(send_schemes.first);

	auto & sends = send_schemes.second;
	std::sort(sends.begin(), sends.end());
	std::transform(sends.begin(), sends.end(), sends.begin(),
	[this](UInt g) -> UInt { return mesh.getNodeLocalId(g); });
	scheme.copy(sends);
	}
	}

	{ // receive schemes
	std::map<UInt, Array<UInt>> recv_array_per_proc;

	for (auto node : arange(mesh.getNbNodes())) {
	if (mesh.isSlaveNode(node)) {
	recv_array_per_proc[mesh.getNodePrank(node)].push_back(
	mesh.getNodeGlobalId(node));
	}
	}

	for (auto & recv_schemes : recv_array_per_proc) {
	auto & scheme = communications.createRecvScheme(recv_schemes.first);

	auto & recvs = recv_schemes.second;
	std::sort(recvs.begin(), recvs.end());
	std::transform(recvs.begin(), recvs.end(), recvs.begin(),
	[this](UInt g) -> UInt { return mesh.getNodeLocalId(g); });

	scheme.copy(recvs);
	}
	}

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void NodeInfoPerProc::fillPeriodicPairs(const Array<UInt> & global_pairs,
	std::vector<UInt> & missing_nodes) {
	this->wipePeriodicInfo();
	auto & nodes_flags = this->getNodesFlags();

	auto checkIsLocal = [&](auto && global_node) {
	auto && node = mesh.getNodeLocalId(global_node);
	if (node == UInt(-1)) {
	auto & global_nodes = this->getNodesGlobalIds();
	node = global_nodes.size();

	global_nodes.push_back(global_node);
	nodes_flags.push_back(NodeFlag::_pure_ghost);
	missing_nodes.push_back(global_node);
	std::cout << "Missing node " << node << std::endl;
	}
	return node;
	};

	for (auto && pairs : make_view(global_pairs, 2)) {
	UInt slave = checkIsLocal(pairs(0));
	UInt master = checkIsLocal(pairs(1));

	this->addPeriodicSlave(slave, master);
	}

	this->markMeshPeriodic();
	}

	/* -------------------------------------------------------------------------- */
	void NodeInfoPerProc::receiveMissingPeriodic(
	DynamicCommunicationBuffer & buffer) {
	auto & nodes = this->getNodes();
	Communications<UInt> & communications =
	this->synchronizer.getCommunications();

	std::size_t nb_nodes;
	buffer >> nb_nodes;

	for (auto _[[gnu::unused]] : arange(nb_nodes)) {
	Vector<Real> pos(spatial_dimension);
	Int prank;
	buffer >> pos;
	buffer >> prank;

	UInt node = nodes.size();

	this->setNodePrank(node, prank);
	nodes.push_back(pos);

	auto & scheme = communications.createRecvScheme(prank);
	scheme.push_back(node);
	}

	while (buffer.getLeftToUnpack() != 0) {
	Int prank;
	UInt gnode;

	buffer >> gnode;
	buffer >> prank;
	auto node = mesh.getNodeLocalId(gnode);

	AKANTU_DEBUG_ASSERT(node != UInt(-1),
	"I cannot send the node "
	<< gnode << " to proc " << prank
	<< " because it is note a local node");

	auto & scheme = communications.createSendScheme(prank);
	scheme.push_back(node);
	}
	}

	/* -------------------------------------------------------------------------- */
	void NodeInfoPerProc::fillNodalData(DynamicCommunicationBuffer & buffer,
	std::string tag_name) {

	#define AKANTU_DISTRIBUTED_SYNHRONIZER_TAG_DATA(r, _, elem) \
	case BOOST_PP_TUPLE_ELEM(2, 0, elem): { \
	auto & nodal_data = \
	mesh.getNodalData<BOOST_PP_TUPLE_ELEM(2, 1, elem)>(tag_name); \
	nodal_data.resize(mesh.getNbNodes()); \
	for (auto && data : make_view(nodal_data)) { \
	buffer >> data; \
	} \
	break; \
	}

	MeshDataTypeCode data_type_code =
	mesh.getTypeCode(tag_name, MeshDataType::_nodal);
	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
	}

	/* -------------------------------------------------------------------------- */
	/* -------------------------------------------------------------------------- */

	/* -------------------------------------------------------------------------- */
	MasterNodeInfoPerProc::MasterNodeInfoPerProc(NodeSynchronizer & synchronizer,
	UInt message_cnt, UInt root)
	: NodeInfoPerProc(synchronizer, message_cnt, root),
	all_nodes(0, synchronizer.getMesh().getSpatialDimension()) {
	UInt nb_global_nodes = this->mesh.getNbGlobalNodes();
	this->comm.broadcast(nb_global_nodes, this->root);
	}

	/* -------------------------------------------------------------------------- */
	void MasterNodeInfoPerProc::synchronizeNodes() {
	this->nodes_per_proc.resize(nb_proc);
	this->nb_nodes_per_proc.resize(nb_proc);

	Array<Real> local_nodes(0, spatial_dimension);
	Array<Real> & nodes = this->getNodes();

	all_nodes.copy(nodes);
	nodes_pranks.resize(nodes.size(), UInt(-1));

	for (UInt p = 0; p < nb_proc; ++p) {
	UInt nb_nodes = 0;
	// UInt * buffer;
	Array<Real> * nodes_to_send;

	Array<UInt> & nodespp = nodes_per_proc[p];
	if (p != root) {
	nodes_to_send = new Array<Real>(0, spatial_dimension);
	AKANTU_DEBUG_INFO("Receiving number of nodes from proc "
	<< p << " " << Tag::genTag(p, 0, Tag::_NB_NODES));
	comm.receive(nb_nodes, p, Tag::genTag(p, 0, Tag::_NB_NODES));
	nodespp.resize(nb_nodes);
	this->nb_nodes_per_proc(p) = nb_nodes;

	AKANTU_DEBUG_INFO("Receiving list of nodes from proc "
	<< p << " " << Tag::genTag(p, 0, Tag::_NODES));
	comm.receive(nodespp, p, Tag::genTag(p, 0, Tag::_NODES));
	} else {
	Array<UInt> & local_ids = this->getNodesGlobalIds();
	this->nb_nodes_per_proc(p) = local_ids.size();
	nodespp.copy(local_ids);
	nodes_to_send = &local_nodes;
	}

	Array<UInt>::const_scalar_iterator it = nodespp.begin();
	Array<UInt>::const_scalar_iterator end = nodespp.end();
	/// get the coordinates for the selected nodes
	for (; it != end; ++it) {
	Vector<Real> coord(nodes.storage() + spatial_dimension * *it,
	spatial_dimension);
	nodes_to_send->push_back(coord);
	}

	if (p != root) { /// send them for distant processors
	AKANTU_DEBUG_INFO("Sending coordinates to proc "
	<< p << " "
	<< Tag::genTag(this->rank, 0, Tag::_COORDINATES));
	comm.send(*nodes_to_send, p,
	Tag::genTag(this->rank, 0, Tag::_COORDINATES));
	delete nodes_to_send;
	}
	}

	/// construct the local nodes coordinates
	nodes.copy(local_nodes);
	}

	/* -------------------------------------------------------------------------- */
	void MasterNodeInfoPerProc::synchronizeTypes() {
	// <global_id, <proc, local_id> >
	std::multimap<UInt, std::pair<UInt, UInt>> nodes_to_proc;
	std::vector<Array<NodeFlag>> nodes_flags_per_proc(nb_proc);
	std::vector<Array<Int>> nodes_prank_per_proc(nb_proc);

	if (mesh.isPeriodic())
	all_periodic_flags.copy(this->getNodesFlags());

	// arrays containing pairs of (proc, node)
	std::vector<Array<UInt>> nodes_to_send_per_proc(nb_proc);
	for (UInt p = 0; p < nb_proc; ++p) {
	nodes_flags_per_proc[p].resize(nb_nodes_per_proc(p), NodeFlag(0xFF));
	nodes_prank_per_proc[p].resize(nb_nodes_per_proc(p), -1);
	}

	this->fillNodesType();

	auto is_master = [](auto && flag) {
	return (flag & NodeFlag::_shared_mask) == NodeFlag::_master;
	};

	auto is_local = [](auto && flag) {
	return (flag & NodeFlag::_shared_mask) == NodeFlag::_normal;
	};

	for (auto p : arange(nb_proc)) {
	auto & nodes_flags = nodes_flags_per_proc[p];

	if (p != root) {
	AKANTU_DEBUG_INFO(
	"Receiving first nodes types from proc "
	<< p << " "
	<< Tag::genTag(this->rank, this->message_count, Tag::_NODES_TYPE));
	comm.receive(nodes_flags, p, Tag::genTag(p, 0, Tag::_NODES_TYPE));
	} else {
	nodes_flags.copy(this->getNodesFlags());
	}

	// stack all processors claiming to be master for a node
	for (auto local_node : arange(nb_nodes_per_proc(p))) {
	auto global_node = nodes_per_proc[p](local_node);

	if (is_master(nodes_flags(local_node))) {
	nodes_to_proc.insert(
	std::make_pair(global_node, std::make_pair(p, local_node)));

	} else if (is_local(nodes_flags(local_node))) {
	nodes_pranks[global_node] = p;
	}
	}
	}

	for (auto i : arange(mesh.getNbGlobalNodes())) {
	auto it_range = nodes_to_proc.equal_range(i);
	if (it_range.first == nodes_to_proc.end() \|\| it_range.first->first != i)
	continue;

	// pick the first processor out of the multi-map as the actual master
	UInt master_proc = (it_range.first)->second.first;
	nodes_pranks[i] = master_proc;

	for (auto && data : range(it_range.first, it_range.second)) {
	auto proc = data.second.first;
	auto node = data.second.second;

	if (proc != master_proc) {
	// store the info on all the slaves for a given master
	nodes_flags_per_proc[proc](node) = NodeFlag::_slave;
	nodes_to_send_per_proc[master_proc].push_back(proc);
	nodes_to_send_per_proc[master_proc].push_back(i);
	}
	}
	}

	/// Fills the nodes prank per proc
	for (auto && data : zip(arange(nb_proc), nodes_per_proc, nodes_prank_per_proc,
	nodes_flags_per_proc)) {
	for (auto && node_data :
	zip(std::get<1>(data), std::get<2>(data), std::get<3>(data))) {
	if (std::get<2>(node_data) == NodeFlag::_normal) {
	std::get<1>(node_data) = std::get<0>(data);
	} else {
	std::get<1>(node_data) = nodes_pranks(std::get<0>(node_data));
	}
	}
	}

	std::vector<CommunicationRequest> requests_send_type;
	std::vector<CommunicationRequest> requests_send_master_info;
	for (UInt p = 0; p < nb_proc; ++p) {
	if (p != root) {
	AKANTU_DEBUG_INFO("Sending nodes types to proc "
	<< p << " "
	<< Tag::genTag(this->rank, 0, Tag::_NODES_TYPE));
	requests_send_type.push_back(
	comm.asyncSend(nodes_flags_per_proc[p], p,
	Tag::genTag(this->rank, 0, Tag::_NODES_TYPE)));

	requests_send_type.push_back(
	comm.asyncSend(nodes_prank_per_proc[p], p,
	Tag::genTag(this->rank, 2, Tag::_NODES_TYPE)));

	auto & nodes_to_send = nodes_to_send_per_proc[p];

	AKANTU_DEBUG_INFO("Sending nodes master info to proc "
	<< p << " "
	<< Tag::genTag(this->rank, 1, Tag::_NODES_TYPE));
	requests_send_master_info.push_back(comm.asyncSend(
	nodes_to_send, p, Tag::genTag(this->rank, 1, Tag::_NODES_TYPE)));
	} else {
	this->getNodesFlags().copy(nodes_flags_per_proc[p]);
	for (auto && data : enumerate(nodes_prank_per_proc[p])) {
	auto node = std::get<0>(data);
	if (not(mesh.isMasterNode(node) or mesh.isLocalNode(node))) {
	this->setNodePrank(node, std::get<1>(data));
	}
	}

	this->fillCommunicationScheme(nodes_to_send_per_proc[root]);
	}
	}

	comm.waitAll(requests_send_type);
	comm.freeCommunicationRequest(requests_send_type);
	requests_send_type.clear();

	comm.waitAll(requests_send_master_info);
	comm.freeCommunicationRequest(requests_send_master_info);
	}

	/* -------------------------------------------------------------------------- */
	void MasterNodeInfoPerProc::synchronizeGroups() {
	AKANTU_DEBUG_IN();

	UInt nb_total_nodes = mesh.getNbGlobalNodes();

	DynamicCommunicationBuffer buffer;

	using NodeToGroup = std::vector<std::vector<std::string>>;
	NodeToGroup node_to_group;
	node_to_group.resize(nb_total_nodes);

	GroupManager::const_node_group_iterator ngi = mesh.node_group_begin();
	GroupManager::const_node_group_iterator nge = mesh.node_group_end();
	for (; ngi != nge; ++ngi) {
	NodeGroup & ng = *(ngi->second);

	std::string name = ngi->first;

	NodeGroup::const_node_iterator nit = ng.begin();
	NodeGroup::const_node_iterator nend = ng.end();
	for (; nit != nend; ++nit) {
	node_to_group[*nit].push_back(name);
	}

	nit = ng.begin();
	if (nit != nend)
	ng.empty();
	}

	buffer << node_to_group;

	std::vector<CommunicationRequest> requests;
	for (UInt p = 0; p < nb_proc; ++p) {
	if (p == this->rank)
	continue;
	AKANTU_DEBUG_INFO("Sending node groups to proc "
	<< p << " "
	<< Tag::genTag(this->rank, p, Tag::_NODE_GROUP));
	requests.push_back(comm.asyncSend(
	buffer, p, Tag::genTag(this->rank, p, Tag::_NODE_GROUP)));
	}

	this->fillNodeGroupsFromBuffer(buffer);

	comm.waitAll(requests);
	comm.freeCommunicationRequest(requests);
	requests.clear();

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void MasterNodeInfoPerProc::synchronizePeriodicity() {
	bool is_periodic = mesh.isPeriodic();
	comm.broadcast(is_periodic, root);

	if (not is_periodic)
	return;

	std::vector<CommunicationRequest> requests;
	std::vector<Array<UInt>> periodic_info_to_send_per_proc;
	for (auto p : arange(nb_proc)) {
	periodic_info_to_send_per_proc.emplace_back(0, 2);
	auto && periodic_info = periodic_info_to_send_per_proc.back();

	for (UInt proc_local_node : arange(nb_nodes_per_proc(p))) {
	UInt global_node = nodes_per_proc[p](proc_local_node);
	if ((all_periodic_flags[global_node] & NodeFlag::_periodic_mask) ==
	NodeFlag::_periodic_slave) {
	periodic_info.push_back(
	Vector<UInt>{global_node, mesh.getPeriodicMaster(global_node)});
	}
	}

	if (p == root)
	continue;

	auto && tag = Tag::genTag(this->rank, p, Tag::_PERIODIC_SLAVES);
	AKANTU_DEBUG_INFO("Sending periodic info to proc " << p << " " << tag);
	requests.push_back(comm.asyncSend(periodic_info, p, tag));
	}

	CommunicationStatus status;
	std::vector<DynamicCommunicationBuffer> buffers(nb_proc);
	std::vector<std::vector<UInt>> proc_missings(nb_proc);
	auto nodes_it = all_nodes.begin(spatial_dimension);

	for (UInt p = 0; p < nb_proc; ++p) {
	auto & proc_missing = proc_missings[p];
	if (p != root) {
	auto && tag = Tag::genTag(p, 0, Tag::_PERIODIC_NODES);
	comm.probe<UInt>(p, tag, status);

	proc_missing.resize(status.size());
	comm.receive(proc_missing, p, tag);
	} else {
	fillPeriodicPairs(periodic_info_to_send_per_proc[root], proc_missing);
	}

	auto & buffer = buffers[p];
	buffer.reserve((spatial_dimension * sizeof(Real) + sizeof(Int)) *
	proc_missing.size());
	buffer << proc_missing.size();
	for (auto && node : proc_missing) {
	buffer << *(nodes_it + node);
	buffer << nodes_pranks(node);
	}
	}

	for (UInt p = 0; p < nb_proc; ++p) {
	for (auto && node : proc_missings[p]) {
	auto & buffer = buffers[nodes_pranks(node)];
	buffer << node;
	buffer << p;
	}
	}

	for (UInt p = 0; p < nb_proc; ++p) {
	if (p != root) {
	auto && tag_send = Tag::genTag(p, 1, Tag::_PERIODIC_NODES);
	requests.push_back(comm.asyncSend(buffers[p], p, tag_send));
	} else {
	receiveMissingPeriodic(buffers[p]);
	}
	}

	comm.waitAll(requests);
	comm.freeCommunicationRequest(requests);
	requests.clear();
	}

	/* -------------------------------------------------------------------------- */
	void MasterNodeInfoPerProc::fillTagBuffers(
	std::vector<DynamicCommunicationBuffer> & buffers,
	const std::string & tag_name) {
	#define AKANTU_DISTRIBUTED_SYNHRONIZER_TAG_DATA(r, _, elem) \
	case BOOST_PP_TUPLE_ELEM(2, 0, elem): { \
	auto & nodal_data = \
	mesh.getNodalData<BOOST_PP_TUPLE_ELEM(2, 1, elem)>(tag_name); \
	for (auto && data : enumerate(nodes_per_proc)) { \
	auto proc = std::get<0>(data); \
	auto & nodes = std::get<1>(data); \
	auto & buffer = buffers[proc]; \
	for (auto & node : nodes) { \
	for (auto i : arange(nodal_data.getNbComponent())) { \
	buffer << nodal_data(node, i); \
	} \
	} \
	} \
	break; \
	}

	MeshDataTypeCode data_type_code =
	mesh.getTypeCode(tag_name, MeshDataType::_nodal);
	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
	} // namespace akantu

	/* -------------------------------------------------------------------------- */
	void MasterNodeInfoPerProc::synchronizeTags() {
	/// tag info
	auto tag_names = mesh.getTagNames();

	DynamicCommunicationBuffer tags_buffer;
	for (auto && tag_name : tag_names) {
	tags_buffer << tag_name;
	tags_buffer << mesh.getTypeCode(tag_name, MeshDataType::_nodal);
	tags_buffer << mesh.getNbComponent(tag_name);
	}

	AKANTU_DEBUG_INFO(
	"Broadcasting the information about the nodes mesh data tags: ("
	<< tags_buffer.size() << ").");
	comm.broadcast(tags_buffer, root);

	for (auto && tag_data : enumerate(tag_names)) {
	auto tag_count = std::get<0>(tag_data);
	auto & tag_name = std::get<1>(tag_data);
	std::vector<DynamicCommunicationBuffer> buffers;
	std::vector<CommunicationRequest> requests;
	buffers.resize(nb_proc);
	fillTagBuffers(buffers, tag_name);
	for (auto && data : enumerate(buffers)) {
	auto && proc = std::get<0>(data);
	auto & buffer = std::get<1>(data);
	if (proc == root) {
	fillNodalData(buffer, tag_name);
	} else {
	auto && tag = Tag::genTag(this->rank, tag_count, Tag::_MESH_DATA);
	requests.push_back(comm.asyncSend(buffer, proc, tag));
	}
	}

	comm.waitAll(requests);
	comm.freeCommunicationRequest(requests);
	}
	}

	/* -------------------------------------------------------------------------- */
	/* -------------------------------------------------------------------------- */

	/* -------------------------------------------------------------------------- */
	SlaveNodeInfoPerProc::SlaveNodeInfoPerProc(NodeSynchronizer & synchronizer,
	UInt message_cnt, UInt root)
	: NodeInfoPerProc(synchronizer, message_cnt, root) {
	UInt nb_global_nodes = 0;
	comm.broadcast(nb_global_nodes, root);
	this->setNbGlobalNodes(nb_global_nodes);
	}

	/* -------------------------------------------------------------------------- */
	void SlaveNodeInfoPerProc::synchronizeNodes() {
	AKANTU_DEBUG_INFO("Sending list of nodes to proc "
	<< root << " " << Tag::genTag(this->rank, 0, Tag::_NB_NODES)
	<< " " << Tag::genTag(this->rank, 0, Tag::_NODES));
	Array<UInt> & local_ids = this->getNodesGlobalIds();
	Array<Real> & nodes = this->getNodes();

	UInt nb_nodes = local_ids.size();
	comm.send(nb_nodes, root, Tag::genTag(this->rank, 0, Tag::_NB_NODES));
	comm.send(local_ids, root, Tag::genTag(this->rank, 0, Tag::_NODES));

	/* --------<<<<-COORDINATES---------------------------------------------- */
	nodes.resize(nb_nodes);
	AKANTU_DEBUG_INFO("Receiving coordinates from proc "
	<< root << " " << Tag::genTag(root, 0, Tag::_COORDINATES));
	comm.receive(nodes, root, Tag::genTag(root, 0, Tag::_COORDINATES));
	}

	/* -------------------------------------------------------------------------- */
	void SlaveNodeInfoPerProc::synchronizeTypes() {
	this->fillNodesType();

	auto & nodes_types = this->getNodesFlags();

	AKANTU_DEBUG_INFO("Sending first nodes types to proc "
	<< root << ""
	<< Tag::genTag(this->rank, 0, Tag::_NODES_TYPE));
	comm.send(nodes_types, root, Tag::genTag(this->rank, 0, Tag::_NODES_TYPE));

	AKANTU_DEBUG_INFO("Receiving nodes types from proc "
	<< root << " " << Tag::genTag(root, 0, Tag::_NODES_TYPE));
	comm.receive(nodes_types, root, Tag::genTag(root, 0, Tag::_NODES_TYPE));

	Array<Int> nodes_prank(nodes_types.size());
	comm.receive(nodes_prank, root, Tag::genTag(root, 2, Tag::_NODES_TYPE));
	for (auto && data : enumerate(nodes_prank)) {
	auto node = std::get<0>(data);
	if (not(mesh.isMasterNode(node) or mesh.isLocalNode(node))) {
	this->setNodePrank(node, std::get<1>(data));
	}
	}

	AKANTU_DEBUG_INFO("Receiving nodes master info from proc "
	<< root << " " << Tag::genTag(root, 1, Tag::_NODES_TYPE));
	CommunicationStatus status;
	comm.probe<UInt>(root, Tag::genTag(root, 1, Tag::_NODES_TYPE), status);

	Array<UInt> nodes_master_info(status.size());
	if (nodes_master_info.size() > 0)
	comm.receive(nodes_master_info, root,
	Tag::genTag(root, 1, Tag::_NODES_TYPE));

	this->fillCommunicationScheme(nodes_master_info);
	}

	/* -------------------------------------------------------------------------- */
	void SlaveNodeInfoPerProc::synchronizeGroups() {
	AKANTU_DEBUG_IN();

	AKANTU_DEBUG_INFO("Receiving node groups from proc "
	<< root << " "
	<< Tag::genTag(root, this->rank, Tag::_NODE_GROUP));

	DynamicCommunicationBuffer buffer;
	comm.receive(buffer, root, Tag::genTag(root, this->rank, Tag::_NODE_GROUP));

	this->fillNodeGroupsFromBuffer(buffer);

	AKANTU_DEBUG_OUT();
	}

	/* -------------------------------------------------------------------------- */
	void SlaveNodeInfoPerProc::synchronizePeriodicity() {
	bool is_periodic;
	comm.broadcast(is_periodic, root);

	if (not is_periodic)
	return;

	CommunicationStatus status;
	auto && tag = Tag::genTag(root, this->rank, Tag::_PERIODIC_SLAVES);
	comm.probe<UInt>(root, tag, status);

	Array<UInt> periodic_info(status.size() / 2, 2);
	comm.receive(periodic_info, root, tag);

	std::vector<UInt> proc_missing;
	fillPeriodicPairs(periodic_info, proc_missing);

	auto && tag_missing_request =
	Tag::genTag(this->rank, 0, Tag::_PERIODIC_NODES);
	comm.send(proc_missing, root, tag_missing_request);

	DynamicCommunicationBuffer buffer;
	auto && tag_missing = Tag::genTag(this->rank, 1, Tag::_PERIODIC_NODES);
	comm.receive(buffer, root, tag_missing);

	receiveMissingPeriodic(buffer);
	}

	/* -------------------------------------------------------------------------- */
	void SlaveNodeInfoPerProc::synchronizeTags() {
	DynamicCommunicationBuffer tags_buffer;
	comm.broadcast(tags_buffer, root);

	std::vector<std::string> tag_names;
	while (tags_buffer.getLeftToUnpack() > 0) {
	std::string name;
	MeshDataTypeCode code;
	UInt nb_components;
	tags_buffer >> name;
	tags_buffer >> code;
	tags_buffer >> nb_components;

	mesh.registerNodalData(name, nb_components, code);
	tag_names.push_back(name);
	}

	for (auto && tag_data : enumerate(tag_names)) {
	auto tag_count = std::get<0>(tag_data);
	auto & tag_name = std::get<1>(tag_data);
	DynamicCommunicationBuffer buffer;
	auto && tag = Tag::genTag(this->root, tag_count, Tag::_MESH_DATA);
	comm.receive(buffer, this->root, tag);

	fillNodalData(buffer, tag_name);
	}
	}

	} // namespace akantu

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