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distributed_synchronizer.cc
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			/**
			* @file distributed_synchronizer.cc
			*
			* @author Dana Christen <dana.christen@epfl.ch>
			* @author Marco Vocialta <marco.vocialta@epfl.ch>
			* @author Nicolas Richart <nicolas.richart@epfl.ch>
			*
			* @date creation: Thu Jun 16 2011
			* @date last modification: Fri Sep 05 2014
			*
			* @brief implementation of a communicator using a static_communicator for real
			* send/receive
			*
			* @section LICENSE
			*
			* Copyright (©) 2010-2012, 2014 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_common.hh"
			#include "distributed_synchronizer.hh"
			#include "static_communicator.hh"
			#include "mesh_utils.hh"
			#include "mesh_data.hh"
			#include "element_group.hh"
			/* -------------------------------------------------------------------------- */
			#include <map>
			#include <iostream>
			#include <algorithm>

			#if defined(AKANTU_DEBUG_TOOLS)
			# include "aka_debug_tools.hh"
			#endif

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

			__BEGIN_AKANTU__

			/* -------------------------------------------------------------------------- */
			DistributedSynchronizer::DistributedSynchronizer(Mesh & mesh,
			SynchronizerID id,
			MemoryID memory_id) :
			Synchronizer(id, memory_id),
			mesh(mesh),
			static_communicator(&StaticCommunicator::getStaticCommunicator()),
			prank_to_element("prank_to_element", id)
			{
			AKANTU_DEBUG_IN();

			nb_proc = static_communicator->getNbProc();
			rank = static_communicator->whoAmI();

			send_element = new Array<Element>[nb_proc];
			recv_element = new Array<Element>[nb_proc];

			mesh.registerEventHandler(*this);

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			DistributedSynchronizer::~DistributedSynchronizer() {
			AKANTU_DEBUG_IN();

			for (UInt p = 0; p < nb_proc; ++p) {
			send_element[p].clear();
			recv_element[p].clear();
			}

			delete [] send_element;
			delete [] recv_element;

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			DistributedSynchronizer * DistributedSynchronizer::
			createDistributedSynchronizerMesh(Mesh & mesh,
			const MeshPartition * partition,
			UInt root,
			SynchronizerID id,
			MemoryID memory_id) {
			AKANTU_DEBUG_IN();

			StaticCommunicator & comm = StaticCommunicator::getStaticCommunicator();
			UInt nb_proc = comm.getNbProc();
			UInt my_rank = comm.whoAmI();

			DistributedSynchronizer & communicator = *(new DistributedSynchronizer(mesh, id, memory_id));

			if(nb_proc == 1) return &communicator;

			UInt * local_connectivity = NULL;
			UInt * local_partitions = NULL;
			Array<UInt> * old_nodes = mesh.getNodesGlobalIdsPointer();
			old_nodes->resize(0);
			Array<Real> * nodes = mesh.getNodesPointer();


			UInt spatial_dimension = nodes->getNbComponent();

			mesh.synchronizeGroupNames();

			/* ------------------------------------------------------------------------ */
			/* Local (rank == root) */
			/* ------------------------------------------------------------------------ */
			if(my_rank == root) {
			AKANTU_DEBUG_ASSERT(partition->getNbPartition() == nb_proc,
			"The number of partition does not match the number of processors: " <<
			partition->getNbPartition() << " != " << nb_proc);

			/**
			* connectivity and communications scheme construction
			*/
			Mesh::type_iterator it = mesh.firstType(_all_dimensions,
			_not_ghost,
			_ek_not_defined);
			Mesh::type_iterator end = mesh.lastType(_all_dimensions,
			_not_ghost,
			_ek_not_defined);
			UInt count = 0;
			/* --- MAIN LOOP ON TYPES --- */
			for(; it != end; ++it) {
			ElementType type = *it;

			UInt nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
			UInt nb_element = mesh.getNbElement(*it);
			UInt nb_local_element[nb_proc];
			UInt nb_ghost_element[nb_proc];
			UInt nb_element_to_send[nb_proc];

			memset(nb_local_element, 0, nb_proc*sizeof(UInt));
			memset(nb_ghost_element, 0, nb_proc*sizeof(UInt));
			memset(nb_element_to_send, 0, nb_proc*sizeof(UInt));

			/// \todo change this ugly way to avoid a problem if an element
			/// type is present in the mesh but not in the partitions
			const Array<UInt> * tmp_partition_num = NULL;
			try {
			tmp_partition_num = &partition->getPartition(type, _not_ghost);
			} catch(...) {
			continue;
			}
			const Array<UInt> & partition_num = *tmp_partition_num;

			const CSR<UInt> & ghost_partition = partition->getGhostPartitionCSR()(type, _not_ghost);

			/* -------------------------------------------------------------------- */
			/// constructing the reordering structures
			for (UInt el = 0; el < nb_element; ++el) {
			nb_local_element[partition_num(el)]++;
			for (CSR<UInt>::const_iterator part = ghost_partition.begin(el);
			part != ghost_partition.end(el);
			++part) {
			nb_ghost_element[*part]++;
			}
			nb_element_to_send[partition_num(el)] += ghost_partition.getNbCols(el) + 1;
			}

			/// allocating buffers
			UInt * buffers[nb_proc];
			UInt * buffers_tmp[nb_proc];
			for (UInt p = 0; p < nb_proc; ++p) {
			UInt size = nb_nodes_per_element * (nb_local_element[p] +
			nb_ghost_element[p]);
			buffers[p] = new UInt[size];
			buffers_tmp[p] = buffers[p];
			}

			/// copying the local connectivity
			UInt * conn_val = mesh.getConnectivity(type, _not_ghost).storage();
			for (UInt el = 0; el < nb_element; ++el) {
			memcpy(buffers_tmp[partition_num(el)],
			conn_val + el * nb_nodes_per_element,
			nb_nodes_per_element * sizeof(UInt));
			buffers_tmp[partition_num(el)] += nb_nodes_per_element;
			}

			/// copying the connectivity of ghost element
			for (UInt el = 0; el < nb_element; ++el) {
			for (CSR<UInt>::const_iterator part = ghost_partition.begin(el);
			part != ghost_partition.end(el);
			++part) {
			UInt proc = *part;
			memcpy(buffers_tmp[proc],
			conn_val + el * nb_nodes_per_element,
			nb_nodes_per_element * sizeof(UInt));
			buffers_tmp[proc] += nb_nodes_per_element;
			}
			}


			/// tag info
			std::vector<std::string> tag_names;
			mesh.getMeshData().getTagNames(tag_names, type);

			UInt nb_tags = tag_names.size();

			/* -------->>>>-SIZE + CONNECTIVITY------------------------------------ */
			/// send all connectivity and ghost information to all processors
			std::vector<CommunicationRequest *> requests;
			for (UInt p = 0; p < nb_proc; ++p) {
			if(p != root) {
			UInt size[5];
			size[0] = (UInt) type;
			size[1] = nb_local_element[p];
			size[2] = nb_ghost_element[p];
			size[3] = nb_element_to_send[p];
			size[4] = nb_tags;
			AKANTU_DEBUG_INFO("Sending connectivities informations to proc " << p << " TAG("<< Tag::genTag(my_rank, count, TAG_SIZES) <<")");
			comm.send(size, 5, p, Tag::genTag(my_rank, count, TAG_SIZES));

			AKANTU_DEBUG_INFO("Sending connectivities to proc " << p << " TAG("<< Tag::genTag(my_rank, count, TAG_CONNECTIVITY) <<")");
			requests.push_back(comm.asyncSend(buffers[p],
			nb_nodes_per_element * (nb_local_element[p] +
			nb_ghost_element[p]),
			p, Tag::genTag(my_rank, count, TAG_CONNECTIVITY)));
			} else {
			local_connectivity = buffers[p];
			}
			}

			/// create the renumbered connectivity
			AKANTU_DEBUG_INFO("Renumbering local connectivities");
			MeshUtils::renumberMeshNodes(mesh,
			local_connectivity,
			nb_local_element[root],
			nb_ghost_element[root],
			type,
			*old_nodes);

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

			for (UInt p = 0; p < nb_proc; ++p) {
			delete [] buffers[p];
			}

			/* -------------------------------------------------------------------- */
			for (UInt p = 0; p < nb_proc; ++p) {
			buffers[p] = new UInt[nb_ghost_element[p] + nb_element_to_send[p]];
			buffers_tmp[p] = buffers[p];
			}

			/// splitting the partition information to send them to processors
			UInt count_by_proc[nb_proc];
			memset(count_by_proc, 0, nb_proc*sizeof(UInt));
			for (UInt el = 0; el < nb_element; ++el) {
			*(buffers_tmp[partition_num(el)]++) = ghost_partition.getNbCols(el);
			UInt i(0);
			for (CSR<UInt>::const_iterator part = ghost_partition.begin(el);
			part != ghost_partition.end(el);
			++part, ++i) {
			(buffers_tmp[partition_num(el)]++) = part;
			}
			}

			for (UInt el = 0; el < nb_element; ++el) {
			UInt i(0);
			for (CSR<UInt>::const_iterator part = ghost_partition.begin(el);
			part != ghost_partition.end(el);
			++part, ++i) {
			(buffers_tmp[part]++) = partition_num(el);
			}
			}

			/* -------->>>>-PARTITIONS--------------------------------------------- */
			/// last data to compute the communication scheme
			for (UInt p = 0; p < nb_proc; ++p) {
			if(p != root) {
			AKANTU_DEBUG_INFO("Sending partition informations to proc " << p << " TAG("<< Tag::genTag(my_rank, count, TAG_PARTITIONS) <<")");
			requests.push_back(comm.asyncSend(buffers[p],
			nb_element_to_send[p] + nb_ghost_element[p],
			p, Tag::genTag(my_rank, count, TAG_PARTITIONS)));
			} else {
			local_partitions = buffers[p];
			}
			}

			if(Mesh::getSpatialDimension(type) == mesh.getSpatialDimension()) {
			AKANTU_DEBUG_INFO("Creating communications scheme");
			communicator.fillCommunicationScheme(local_partitions,
			nb_local_element[root],
			nb_ghost_element[root],
			type);
			}

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

			for (UInt p = 0; p < nb_proc; ++p) {
			delete [] buffers[p];
			}

			/* -------------------------------------------------------------------- */
			/// send data assossiated to the mesh
			/* -------->>>>-TAGS--------------------------------------------------- */
			synchronizeTagsSend(communicator, root, mesh, nb_tags, type,
			partition_num,
			ghost_partition,
			nb_local_element[root],
			nb_ghost_element[root]);


			/* -------------------------------------------------------------------- */
			/// send data assossiated to groups
			/* -------->>>>-GROUPS------------------------------------------------- */
			synchronizeElementGroups(communicator, root, mesh, type,
			partition_num,
			ghost_partition,
			nb_element);

			++count;
			}

			/* -------->>>>-SIZE----------------------------------------------------- */
			for (UInt p = 0; p < nb_proc; ++p) {
			if(p != root) {
			UInt size[5];
			size[0] = (UInt) _not_defined;
			size[1] = 0;
			size[2] = 0;
			size[3] = 0;
			size[4] = 0;
			AKANTU_DEBUG_INFO("Sending empty connectivities informations to proc " << p << " TAG("<< Tag::genTag(my_rank, count, TAG_SIZES) <<")");
			comm.send(size, 5, p, Tag::genTag(my_rank, count, TAG_SIZES));
			}
			}

			/* ---------------------------------------------------------------------- */
			/* ---------------------------------------------------------------------- */
			/**
			* Nodes coordinate construction and synchronization
			*/
			std::multimap< UInt, std::pair<UInt, UInt> > nodes_to_proc;
			/// get the list of nodes to send and send them
			Real * local_nodes = NULL;
			UInt nb_nodes_per_proc[nb_proc];
			UInt * nodes_per_proc[nb_proc];

			comm.broadcast(&(mesh.nb_global_nodes), 1, root);

			/* --------<<<<-NB_NODES + NODES----------------------------------------- */
			for (UInt p = 0; p < nb_proc; ++p) {
			UInt nb_nodes = 0;
			// UInt * buffer;
			if(p != root) {
			AKANTU_DEBUG_INFO("Receiving number of nodes from proc " << p << " TAG("<< Tag::genTag(p, 0, TAG_NB_NODES) <<")");
			comm.receive(&nb_nodes, 1, p, Tag::genTag(p, 0, TAG_NB_NODES));
			nodes_per_proc[p] = new UInt[nb_nodes];
			nb_nodes_per_proc[p] = nb_nodes;
			AKANTU_DEBUG_INFO("Receiving list of nodes from proc " << p << " TAG("<< Tag::genTag(p, 0, TAG_NODES) <<")");
			comm.receive(nodes_per_proc[p], nb_nodes, p, Tag::genTag(p, 0, TAG_NODES));
			} else {
			nb_nodes = old_nodes->getSize();
			nb_nodes_per_proc[p] = nb_nodes;
			nodes_per_proc[p] = old_nodes->storage();
			}

			/// get the coordinates for the selected nodes
			Real * nodes_to_send = new Real[nb_nodes * spatial_dimension];
			Real * nodes_to_send_tmp = nodes_to_send;
			for (UInt n = 0; n < nb_nodes; ++n) {
			memcpy(nodes_to_send_tmp,
			nodes->storage() + spatial_dimension * nodes_per_proc[p][n],
			spatial_dimension * sizeof(Real));
			// nodes_to_proc.insert(std::make_pair(buffer[n], std::make_pair(p, n)));
			nodes_to_send_tmp += spatial_dimension;
			}

			/* -------->>>>-COORDINATES-------------------------------------------- */
			if(p != root) { /// send them for distant processors
			AKANTU_DEBUG_INFO("Sending coordinates to proc " << p << " TAG("<< Tag::genTag(my_rank, 0, TAG_COORDINATES) <<")");
			comm.send(nodes_to_send, nb_nodes * spatial_dimension, p, Tag::genTag(my_rank, 0, TAG_COORDINATES));
			delete [] nodes_to_send;
			} else { /// save them for local processor
			local_nodes = nodes_to_send;
			}
			}


			/// construct the local nodes coordinates
			UInt nb_nodes = old_nodes->getSize();
			nodes->resize(nb_nodes);
			memcpy(nodes->storage(), local_nodes, nb_nodes * spatial_dimension * sizeof(Real));
			delete [] local_nodes;

			Array<Int> * nodes_type_per_proc[nb_proc];
			for (UInt p = 0; p < nb_proc; ++p) {
			nodes_type_per_proc[p] = new Array<Int>(nb_nodes_per_proc[p]);
			}

			communicator.fillNodesType(mesh);

			/* --------<<<<-NODES_TYPE-1--------------------------------------------- */
			for (UInt p = 0; p < nb_proc; ++p) {
			if(p != root) {
			AKANTU_DEBUG_INFO("Receiving first nodes types from proc " << p << " TAG("<< Tag::genTag(my_rank, count, TAG_NODES_TYPE) <<")");
			comm.receive(nodes_type_per_proc[p]->storage(),
			nb_nodes_per_proc[p], p, Tag::genTag(p, 0, TAG_NODES_TYPE));
			} else {
			nodes_type_per_proc[p]->copy(mesh.getNodesType());
			}
			for (UInt n = 0; n < nb_nodes_per_proc[p]; ++n) {
			if((*nodes_type_per_proc[p])(n) == -2)
			nodes_to_proc.insert(std::make_pair(nodes_per_proc[p][n], std::make_pair(p, n)));
			}
			}

			std::multimap< UInt, std::pair<UInt, UInt> >::iterator it_node;
			std::pair< std::multimap< UInt, std::pair<UInt, UInt> >::iterator,
			std::multimap< UInt, std::pair<UInt, UInt> >::iterator > it_range;
			for (UInt i = 0; i < mesh.nb_global_nodes; ++i) {
			it_range = nodes_to_proc.equal_range(i);
			if(it_range.first == nodes_to_proc.end() \|\| it_range.first->first != i) continue;

			UInt node_type = (it_range.first)->second.first;
			for (it_node = it_range.first; it_node != it_range.second; ++it_node) {
			UInt proc = it_node->second.first;
			UInt node = it_node->second.second;
			if(proc != node_type)
			nodes_type_per_proc[proc]->storage()[node] = node_type;
			}
			}

			/* -------->>>>-NODES_TYPE-2--------------------------------------------- */
			std::vector<CommunicationRequest *> requests;
			for (UInt p = 0; p < nb_proc; ++p) {
			if(p != root) {
			AKANTU_DEBUG_INFO("Sending nodes types to proc " << p << " TAG("<< Tag::genTag(my_rank, 0, TAG_NODES_TYPE) <<")");
			requests.push_back(comm.asyncSend(nodes_type_per_proc[p]->storage(),
			nb_nodes_per_proc[p], p, Tag::genTag(my_rank, 0, TAG_NODES_TYPE)));
			} else {
			mesh.getNodesTypePointer()->copy(*nodes_type_per_proc[p]);
			}
			}

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

			for (UInt p = 0; p < nb_proc; ++p) {
			if(p != root) delete [] nodes_per_proc[p];
			delete nodes_type_per_proc[p];
			}

			/* -------->>>>-NODE GROUPS --------------------------------------------- */
			synchronizeNodeGroupsMaster(communicator, root, mesh);

			/* ---------------------------------------------------------------------- */
			/* Distant (rank != root) */
			/* ---------------------------------------------------------------------- */
			} else {
			/**
			* connectivity and communications scheme construction on distant processors
			*/
			ElementType type = _not_defined;
			UInt count = 0;
			do {
			/* --------<<<<-SIZE--------------------------------------------------- */
			UInt size[5] = { 0 };
			comm.receive(size, 5, root, Tag::genTag(root, count, TAG_SIZES));

			type = (ElementType) size[0];
			UInt nb_local_element = size[1];
			UInt nb_ghost_element = size[2];
			UInt nb_element_to_send = size[3];
			UInt nb_tags = size[4];

			if(type != _not_defined) {
			UInt nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
			/* --------<<<<-CONNECTIVITY----------------------------------------- */
			local_connectivity = new UInt[(nb_local_element + nb_ghost_element) *
			nb_nodes_per_element];
			AKANTU_DEBUG_INFO("Receiving connectivities from proc " << root);
			comm.receive(local_connectivity, nb_nodes_per_element * (nb_local_element +
			nb_ghost_element),
			root, Tag::genTag(root, count, TAG_CONNECTIVITY));

			AKANTU_DEBUG_INFO("Renumbering local connectivities");
			MeshUtils::renumberMeshNodes(mesh,
			local_connectivity,
			nb_local_element,
			nb_ghost_element,
			type,
			*old_nodes);

			delete [] local_connectivity;

			/* --------<<<<-PARTITIONS--------------------------------------------- */
			local_partitions = new UInt[nb_element_to_send + nb_ghost_element * 2];
			AKANTU_DEBUG_INFO("Receiving partition informations from proc " << root);
			comm.receive(local_partitions,
			nb_element_to_send + nb_ghost_element * 2,
			root, Tag::genTag(root, count, TAG_PARTITIONS));

			if(Mesh::getSpatialDimension(type) == mesh.getSpatialDimension()) {
			AKANTU_DEBUG_INFO("Creating communications scheme");
			communicator.fillCommunicationScheme(local_partitions,
			nb_local_element,
			nb_ghost_element,
			type);
			}
			delete [] local_partitions;

			/* --------<<<<-TAGS------------------------------------------------- */
			synchronizeTagsRecv(communicator, root, mesh, nb_tags, type,
			nb_local_element,
			nb_ghost_element);

			/* --------<<<<-GROUPS----------------------------------------------- */
			synchronizeElementGroups(communicator, root, mesh, type);
			}
			++count;
			} while(type != _not_defined);

			/**
			* Nodes coordinate construction and synchronization on distant processors
			*/
			comm.broadcast(&(mesh.nb_global_nodes), 1, root);

			/* -------->>>>-NB_NODES + NODES----------------------------------------- */
			AKANTU_DEBUG_INFO("Sending list of nodes to proc " << root);
			UInt nb_nodes = old_nodes->getSize();
			comm.send(&nb_nodes, 1, root, Tag::genTag(my_rank, 0, TAG_NB_NODES));
			comm.send(old_nodes->storage(), nb_nodes, root, Tag::genTag(my_rank, 0, TAG_NODES));

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

			communicator.fillNodesType(mesh);
			/* -------->>>>-NODES_TYPE-1--------------------------------------------- */
			Int * nodes_types = mesh.getNodesTypePointer()->storage();
			AKANTU_DEBUG_INFO("Sending first nodes types to proc " << root);
			comm.send(nodes_types, nb_nodes,
			root, Tag::genTag(my_rank, 0, TAG_NODES_TYPE));

			/* --------<<<<-NODES_TYPE-2--------------------------------------------- */
			AKANTU_DEBUG_INFO("Receiving nodes types from proc " << root);
			comm.receive(nodes_types, nb_nodes,
			root, Tag::genTag(root, 0, TAG_NODES_TYPE));

			/* --------<<<<-NODE GROUPS --------------------------------------------- */
			synchronizeNodeGroupsSlaves(communicator, root, mesh);
			}

			MeshUtils::fillElementToSubElementsData(mesh);

			mesh.is_distributed = true;

			AKANTU_DEBUG_OUT();
			return &communicator;
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::fillTagBuffer(const MeshData & mesh_data,
			DynamicCommunicationBuffer * buffers,
			const std::string & tag_name,
			const ElementType & el_type,
			const Array<UInt> & partition_num,
			const CSR<UInt> & ghost_partition) {
			#define AKANTU_DISTRIBUTED_SYNHRONIZER_TAG_DATA(r, extra_param, elem) \
			case BOOST_PP_TUPLE_ELEM(2, 0, elem) : { \
			fillTagBufferTemplated<BOOST_PP_TUPLE_ELEM(2, 1, elem)>(mesh_data, buffers, tag_name, el_type, partition_num, ghost_partition); \
			break; \
			} \

			MeshDataTypeCode data_type_code = mesh_data.getTypeCode(tag_name);
			switch(data_type_code) {
			BOOST_PP_SEQ_FOR_EACH(AKANTU_DISTRIBUTED_SYNHRONIZER_TAG_DATA, , AKANTU_MESH_DATA_TYPES)
			default : AKANTU_DEBUG_ERROR("Could not obtain the type of tag" << tag_name << "!"); break;
			}
			#undef AKANTU_DISTRIBUTED_SYNHRONIZER_TAG_DATA
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::fillNodesType(Mesh & mesh) {
			AKANTU_DEBUG_IN();

			UInt nb_nodes = mesh.getNbNodes();
			Int * nodes_type = mesh.getNodesTypePointer()->storage();

			UInt * nodes_set = new UInt[nb_nodes];
			std::fill_n(nodes_set, nb_nodes, 0);

			const UInt NORMAL_SET = 1;
			const UInt GHOST_SET = 2;

			bool * already_seen = new bool[nb_nodes];

			for(UInt g = _not_ghost; g <= _ghost; ++g) {
			GhostType gt = (GhostType) g;
			UInt set = NORMAL_SET;
			if (gt == _ghost) set = GHOST_SET;

			std::fill_n(already_seen, nb_nodes, false);
			Mesh::type_iterator it = mesh.firstType(_all_dimensions, gt, _ek_not_defined);
			Mesh::type_iterator end = mesh.lastType(_all_dimensions, gt, _ek_not_defined);
			for(; it != end; ++it) {
			ElementType type = *it;

			UInt nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
			UInt nb_element = mesh.getNbElement(type, gt);
			Array<UInt>::iterator< Vector<UInt> > conn_it = mesh.getConnectivity(type, gt).begin(nb_nodes_per_element);

			for (UInt e = 0; e < nb_element; ++e, ++conn_it) {
			Vector<UInt> & conn = *conn_it;
			for (UInt n = 0; n < nb_nodes_per_element; ++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;
			}
			}
			}
			}
			}

			delete [] already_seen;

			for (UInt i = 0; i < nb_nodes; ++i) {
			if(nodes_set[i] == NORMAL_SET) nodes_type[i] = -1;
			else if(nodes_set[i] == GHOST_SET) nodes_type[i] = -3;
			else if(nodes_set[i] == (GHOST_SET + NORMAL_SET)) nodes_type[i] = -2;
			}

			delete [] nodes_set;

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::fillCommunicationScheme(const UInt * partition,
			UInt nb_local_element,
			UInt nb_ghost_element,
			ElementType type) {
			AKANTU_DEBUG_IN();

			Element element;
			element.type = type;
			element.kind = Mesh::getKind(type);

			const UInt * part = partition;

			part = partition;
			for (UInt lel = 0; lel < nb_local_element; ++lel) {
			UInt nb_send = *part; part++;
			element.element = lel;
			element.ghost_type = _not_ghost;
			for (UInt p = 0; p < nb_send; ++p) {
			UInt proc = *part; part++;

			AKANTU_DEBUG(dblAccessory, "Must send : " << element << " to proc " << proc);
			(send_element[proc]).push_back(element);
			}
			}

			for (UInt gel = 0; gel < nb_ghost_element; ++gel) {
			UInt proc = *part; part++;
			element.element = gel;
			element.ghost_type = _ghost;
			AKANTU_DEBUG(dblAccessory, "Must recv : " << element << " from proc " << proc);
			recv_element[proc].push_back(element);
			}

			AKANTU_DEBUG_OUT();
			}


			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::asynchronousSynchronize(DataAccessor & data_accessor,
			SynchronizationTag tag) {
			AKANTU_DEBUG_IN();

			if (communications.find(tag) == communications.end())
			computeBufferSize(data_accessor, tag);

			Communication & communication = communications[tag];

			AKANTU_DEBUG_ASSERT(communication.send_requests.size() == 0,
			"There must be some pending sending communications. Tag is " << tag);

			std::map<SynchronizationTag, UInt>::iterator t_it = tag_counter.find(tag);
			UInt counter = 0;
			if(t_it == tag_counter.end()) {
			tag_counter[tag] = 0;
			} else {
			counter = ++(t_it->second);
			}

			for (UInt p = 0; p < nb_proc; ++p) {
			UInt ssize = communication.size_to_send[p];
			if(p == rank \|\| ssize == 0) continue;

			CommunicationBuffer & buffer = communication.send_buffer[p];
			buffer.resize(ssize);
			#ifndef AKANTU_NDEBUG
			UInt nb_elements = send_element[p].getSize();
			AKANTU_DEBUG_INFO("Packing data for proc " << p
			<< " (" << ssize << "/" << nb_elements
			<<" data to send/elements)");

			/// pack barycenters in debug mode
			Array<Element>::const_iterator<Element> bit = send_element[p].begin();
			Array<Element>::const_iterator<Element> bend = send_element[p].end();
			for (; bit != bend; ++bit) {
			const Element & element = *bit;
			Vector<Real> barycenter(mesh.getSpatialDimension());
			mesh.getBarycenter(element.element, element.type, barycenter.storage(), element.ghost_type);
			buffer << barycenter;
			}
			#endif

			data_accessor.packElementData(buffer, send_element[p], tag);

			AKANTU_DEBUG_ASSERT(buffer.getPackedSize() == ssize,
			"a problem have been introduced with "
			<< "false sent sizes declaration "
			<< buffer.getPackedSize() << " != " << ssize);
			AKANTU_DEBUG_INFO("Posting send to proc " << p
			<< " (tag: " << tag << " - " << ssize << " data to send)"
			<< " [" << Tag::genTag(rank, counter, tag) << "]");
			communication.send_requests.push_back(static_communicator->asyncSend(buffer.storage(),
			ssize,
			p,
			Tag::genTag(rank, counter, tag)));
			}

			AKANTU_DEBUG_ASSERT(communication.recv_requests.size() == 0,
			"There must be some pending receive communications");

			for (UInt p = 0; p < nb_proc; ++p) {
			UInt rsize = communication.size_to_receive[p];
			if(p == rank \|\| rsize == 0) continue;
			CommunicationBuffer & buffer = communication.recv_buffer[p];
			buffer.resize(rsize);

			AKANTU_DEBUG_INFO("Posting receive from proc " << p
			<< " (tag: " << tag << " - " << rsize << " data to receive) "
			<< " [" << Tag::genTag(p, counter, tag) << "]");
			communication.recv_requests.push_back(static_communicator->asyncReceive(buffer.storage(),
			rsize,
			p,
			Tag::genTag(p, counter, tag)));
			}


			#if defined(AKANTU_DEBUG_TOOLS) && defined(AKANTU_CORE_CXX11)
			static std::set<SynchronizationTag> tags;
			if(tags.find(tag) == tags.end()) {
			debug::element_manager.print(debug::_dm_synch,
			[&send_element, rank, nb_proc, tag, id](const Element & el)->std::string {
			std::stringstream out;
			UInt elp = 0;
			for (UInt p = 0; p < nb_proc; ++p) {
			UInt pos = send_element[p].find(el);
			if(pos != UInt(-1)) {
			if(elp > 0) out << std::endl;
			out << id << " send (" << pos << "/" << send_element[p].getSize() << ") to proc " << p << " tag:" << tag;
			++elp;
			}
			}
			return out.str();
			});

			debug::element_manager.print(debug::_dm_synch,
			[&recv_element, rank, nb_proc, tag, id](const Element & el)->std::string {
			std::stringstream out;
			UInt elp = 0;
			for (UInt p = 0; p < nb_proc; ++p) {
			if(p == rank) continue;
			UInt pos = recv_element[p].find(el);
			if(pos != UInt(-1)) {
			if(elp > 0) out << std::endl;
			out << id << " recv (" << pos << "/" << recv_element[p].getSize() << ") from proc " << p << " tag:" << tag;
			++elp;
			}
			}
			return out.str();
			});
			tags.insert(tag);
			}
			#endif


			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::waitEndSynchronize(DataAccessor & data_accessor,
			SynchronizationTag tag) {
			AKANTU_DEBUG_IN();

			AKANTU_DEBUG_ASSERT(communications.find(tag) != communications.end(), "No communication with the tag \""
			<< tag <<"\" started");

			Communication & communication = communications[tag];

			std::vector<CommunicationRequest *> req_not_finished;
			std::vector<CommunicationRequest > req_not_finished_tmp = &req_not_finished;
			std::vector<CommunicationRequest > recv_requests_tmp = &(communication.recv_requests);

			// static_communicator->waitAll(recv_requests);
			while(!recv_requests_tmp->empty()) {
			for (std::vector<CommunicationRequest *>::iterator req_it = recv_requests_tmp->begin();
			req_it != recv_requests_tmp->end() ; ++req_it) {
			CommunicationRequest * req = *req_it;

			if(static_communicator->testRequest(req)) {
			UInt proc = req->getSource();
			AKANTU_DEBUG_INFO("Unpacking data coming from proc " << proc);
			CommunicationBuffer & buffer = communication.recv_buffer[proc];

			#ifndef AKANTU_NDEBUG
			Array<Element>::const_iterator<Element> bit = recv_element[proc].begin();
			Array<Element>::const_iterator<Element> bend = recv_element[proc].end();

			UInt spatial_dimension = mesh.getSpatialDimension();

			for (; bit != bend; ++bit) {
			const Element & element = *bit;

			Vector<Real> barycenter_loc(spatial_dimension);
			mesh.getBarycenter(element.element,
			element.type,
			barycenter_loc.storage(),
			element.ghost_type);
			Vector<Real> barycenter(spatial_dimension);
			buffer >> barycenter;
			Real tolerance = Math::getTolerance();
			Real bary_norm = barycenter.norm();
			for (UInt i = 0; i < spatial_dimension; ++i) {
			if((std::abs((barycenter(i) - barycenter_loc(i))/bary_norm) <= tolerance) \|\|
			(std::abs(barycenter_loc(i)) <= 0 && std::abs(barycenter(i)) <= tolerance)) continue;
			AKANTU_DEBUG_ERROR("Unpacking an unknown value for the element: "
			<< element
			<< "(barycenter[" << i << "] = " << barycenter_loc(i)
			<< " and buffer[" << i << "] = " << barycenter(i) << ") ["
			<< std::abs((barycenter(i) - barycenter_loc(i))/barycenter_loc(i))
			<< "] - tag: " << tag);
			}
			}
			#endif

			data_accessor.unpackElementData(buffer, recv_element[proc], tag);
			buffer.resize(0);

			AKANTU_DEBUG_ASSERT(buffer.getLeftToUnpack() == 0,
			"all data have not been unpacked: "
			<< buffer.getLeftToUnpack() << " bytes left");
			static_communicator->freeCommunicationRequest(req);
			} else {
			req_not_finished_tmp->push_back(req);
			}
			}

			std::vector<CommunicationRequest > swap = req_not_finished_tmp;
			req_not_finished_tmp = recv_requests_tmp;
			recv_requests_tmp = swap;

			req_not_finished_tmp->clear();
			}


			AKANTU_DEBUG_INFO("Waiting that every send requests are received");
			static_communicator->waitAll(communication.send_requests);
			for (std::vector<CommunicationRequest *>::iterator req_it = communication.send_requests.begin();
			req_it != communication.send_requests.end() ; ++req_it) {
			CommunicationRequest & req = (req_it);

			if(static_communicator->testRequest(&req)) {
			UInt proc = req.getDestination();
			CommunicationBuffer & buffer = communication.send_buffer[proc];
			buffer.resize(0);
			static_communicator->freeCommunicationRequest(&req);
			}
			}
			communication.send_requests.clear();

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::computeBufferSize(DataAccessor & data_accessor,
			SynchronizationTag tag) {
			AKANTU_DEBUG_IN();

			communications[tag].resize(nb_proc);

			for (UInt p = 0; p < nb_proc; ++p) {
			UInt ssend = 0;
			UInt sreceive = 0;
			if(p != rank) {
			if(send_element[p].getSize() != 0) {
			#ifndef AKANTU_NDEBUG
			ssend += send_element[p].getSize() * mesh.getSpatialDimension() * sizeof(Real);
			#endif
			ssend += data_accessor.getNbDataForElements(send_element[p], tag);
			AKANTU_DEBUG_INFO("I have " << ssend << "(" << ssend / 1024.
			<< "kB - "<< send_element[p].getSize() <<" element(s)) data to send to " << p << " for tag "
			<< tag);
			}

			if(recv_element[p].getSize() != 0) {
			#ifndef AKANTU_NDEBUG
			sreceive += recv_element[p].getSize() * mesh.getSpatialDimension() * sizeof(Real);
			#endif
			sreceive += data_accessor.getNbDataForElements(recv_element[p], tag);
			AKANTU_DEBUG_INFO("I have " << sreceive << "(" << sreceive / 1024.
			<< "kB - "<< recv_element[p].getSize() <<" element(s)) data to receive for tag "
			<< tag);
			}
			}

			communications[tag].size_to_send [p] = ssend;
			communications[tag].size_to_receive[p] = sreceive;
			}

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::printself(std::ostream & stream, int indent) const {
			std::string space;
			for(Int i = 0; i < indent; i++, space += AKANTU_INDENT);

			Int prank = StaticCommunicator::getStaticCommunicator().whoAmI();
			Int psize = StaticCommunicator::getStaticCommunicator().getNbProc();
			stream << "[" << prank << "/" << psize << "]" << space << "DistributedSynchronizer [" << std::endl;
			for (UInt p = 0; p < nb_proc; ++p) {
			if (p == UInt(prank)) continue;
			stream << "[" << prank << "/" << psize << "]" << space
			<< " + Communication to proc " << p << " [" << std::endl;
			if(AKANTU_DEBUG_TEST(dblDump)) {
			stream << "[" << prank << "/" << psize << "]" << space
			<< " - Element to send to proc " << p << " [" << std::endl;

			Array<Element>::iterator<Element> it_el = send_element[p].begin();
			Array<Element>::iterator<Element> end_el = send_element[p].end();
			for(;it_el != end_el; ++it_el)
			stream << "[" << prank << "/" << psize << "]" << space << " " << *it_el << std::endl;
			stream << "[" << prank << "/" << psize << "]" << space << " ]" << std::endl;

			stream << "[" << prank << "/" << psize << "]" << space
			<< " - Element to recv from proc " << p << " [" << std::endl;

			it_el = recv_element[p].begin();
			end_el = recv_element[p].end();
			for(;it_el != end_el; ++it_el)
			stream << "[" << prank << "/" << psize << "]"
			<< space << " " << *it_el << std::endl;

			stream << "[" << prank << "/" << psize << "]" << space << " ]" << std::endl;
			}

			std::map< SynchronizationTag, Communication>::const_iterator it = communications.begin();
			std::map< SynchronizationTag, Communication>::const_iterator end = communications.end();
			for (; it != end; ++it) {
			const SynchronizationTag & tag = it->first;
			const Communication & communication = it->second;
			UInt ssend = communication.size_to_send[p];
			UInt sreceive = communication.size_to_receive[p];
			stream << "[" << prank << "/" << psize << "]" << space << " - Tag " << tag << " -> " << ssend << "byte(s) -- <- " << sreceive << "byte(s)" << std::endl;
			}
			}
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::onElementsRemoved(const Array<Element> & element_to_remove,
			const ElementTypeMapArray<UInt> & new_numbering,
			__attribute__((unused)) const RemovedElementsEvent & event) {
			AKANTU_DEBUG_IN();

			StaticCommunicator & comm = StaticCommunicator::getStaticCommunicator();
			UInt psize = comm.getNbProc();
			UInt prank = comm.whoAmI();

			std::vector<CommunicationRequest *> isend_requests;
			Array<UInt> * list_of_el = new Array<UInt>[nb_proc];
			// Handling ghost elements
			for (UInt p = 0; p < psize; ++p) {
			if (p == prank) continue;

			Array<Element> & recv = recv_element[p];
			if(recv.getSize() == 0) continue;

			Array<Element>::iterator<Element> recv_begin = recv.begin();
			Array<Element>::iterator<Element> recv_end = recv.end();

			Array<Element>::const_iterator<Element> er_it = element_to_remove.begin();
			Array<Element>::const_iterator<Element> er_end = element_to_remove.end();

			Array<UInt> & list = list_of_el[p];
			for (UInt i = 0; recv_begin != recv_end; ++i, ++recv_begin) {
			const Element & el = *recv_begin;
			Array<Element>::const_iterator<Element> pos = std::find(er_it, er_end, el);
			if(pos == er_end) {
			list.push_back(i);
			}
			}

			if(list.getSize() == recv.getSize())
			list.push_back(UInt(0));
			else list.push_back(UInt(-1));

			AKANTU_DEBUG_INFO("Sending a message of size " << list.getSize() << " to proc " << p << " TAG(" << Tag::genTag(prank, 0, 0) << ")");
			isend_requests.push_back(comm.asyncSend(list.storage(), list.getSize(),
			p, Tag::genTag(prank, 0, 0)));

			list.erase(list.getSize() - 1);
			if(list.getSize() == recv.getSize()) continue;

			Array<Element> new_recv;
			for (UInt nr = 0; nr < list.getSize(); ++nr) {
			Element & el = recv(list(nr));
			el.element = new_numbering(el.type, el.ghost_type)(el.element);
			new_recv.push_back(el);
			}

			AKANTU_DEBUG_INFO("I had " << recv.getSize() << " elements to recv from proc " << p << " and "
			<< list.getSize() << " elements to keep. I have "
			<< new_recv.getSize() << " elements left.");
			recv.copy(new_recv);
			}

			for (UInt p = 0; p < psize; ++p) {
			if (p == prank) continue;
			Array<Element> & send = send_element[p];

			if(send.getSize() == 0) continue;

			CommunicationStatus status;
			AKANTU_DEBUG_INFO("Getting number of elements of proc " << p << " not needed anymore TAG("<< Tag::genTag(p, 0, 0) <<")");
			comm.probe<UInt>(p, Tag::genTag(p, 0, 0), status);
			Array<UInt> list(status.getSize());

			AKANTU_DEBUG_INFO("Receiving list of elements (" << status.getSize() - 1
			<< " elements) no longer needed by proc " << p
			<< " TAG("<< Tag::genTag(p, 0, 0) <<")");
			comm.receive(list.storage(), list.getSize(),
			p, Tag::genTag(p, 0, 0));

			if(list.getSize() == 1 && list(0) == 0) continue;

			list.erase(list.getSize() - 1);

			Array<Element> new_send;
			for (UInt ns = 0; ns < list.getSize(); ++ns) {
			new_send.push_back(send(list(ns)));
			}

			AKANTU_DEBUG_INFO("I had " << send.getSize() << " elements to send to proc " << p << " and "
			<< list.getSize() << " elements to keep. I have "
			<< new_send.getSize() << " elements left.");
			send.copy(new_send);
			}

			comm.waitAll(isend_requests);
			comm.freeCommunicationRequest(isend_requests);

			delete [] list_of_el;
			AKANTU_DEBUG_OUT();
			}


			// void DistributedSynchronizer::checkCommunicationScheme() {
			// for (UInt p = 0; p < psize; ++p) {
			// if (p == prank) continue;
			// for(UInt e(0), e < recv_element.getSize())
			// }
			// }

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::buildPrankToElement() {
			AKANTU_DEBUG_IN();

			UInt spatial_dimension = mesh.getSpatialDimension();

			mesh.initElementTypeMapArray(prank_to_element,
			1,
			spatial_dimension,
			false,
			_ek_not_defined,
			true);

			Mesh::type_iterator it = mesh.firstType(spatial_dimension,
			_not_ghost,
			_ek_not_defined);

			Mesh::type_iterator end = mesh.lastType(spatial_dimension,
			_not_ghost,
			_ek_not_defined);

			/// assign prank to all not ghost elements
			for (; it != end; ++it) {
			UInt nb_element = mesh.getNbElement(*it);
			Array<UInt> & prank_to_el = prank_to_element(*it);
			for (UInt el = 0; el < nb_element; ++el) {
			prank_to_el(el) = rank;
			}
			}

			/// assign prank to all ghost elements
			for (UInt p = 0; p < nb_proc; ++p) {
			UInt nb_ghost_element = recv_element[p].getSize();

			for (UInt el = 0; el < nb_ghost_element; ++el) {
			UInt element = recv_element[p](el).element;
			ElementType type = recv_element[p](el).type;
			GhostType ghost_type = recv_element[p](el).ghost_type;

			Array<UInt> & prank_to_el = prank_to_element(type, ghost_type);
			prank_to_el(element) = p;
			}
			}

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::filterElementsByKind(DistributedSynchronizer * new_synchronizer,
			ElementKind kind) {
			AKANTU_DEBUG_IN();

			Array<Element> * newsy_send_element = new_synchronizer->send_element;
			Array<Element> * newsy_recv_element = new_synchronizer->recv_element;

			Array<Element> * new_send_element = new Array<Element>[nb_proc];
			Array<Element> * new_recv_element = new Array<Element>[nb_proc];

			for (UInt p = 0; p < nb_proc; ++p) {

			/// send element copying part
			new_send_element[p].resize(0);

			for (UInt el = 0; el < send_element[p].getSize(); ++el) {
			Element & element = send_element[p](el);

			if (element.kind == kind)
			newsy_send_element[p].push_back(element);
			else
			new_send_element[p].push_back(element);
			}

			/// recv element copying part
			new_recv_element[p].resize(0);

			for (UInt el = 0; el < recv_element[p].getSize(); ++el) {
			Element & element = recv_element[p](el);

			if (element.kind == kind)
			newsy_recv_element[p].push_back(element);
			else
			new_recv_element[p].push_back(element);
			}
			}

			/// deleting and reassigning old pointers
			delete [] send_element;
			delete [] recv_element;

			send_element = new_send_element;
			recv_element = new_recv_element;

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::reset() {
			AKANTU_DEBUG_IN();

			for (UInt p = 0; p < nb_proc; ++p) {
			send_element[p].resize(0);
			recv_element[p].resize(0);
			}

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::synchronizeTagsSend(DistributedSynchronizer & communicator,
			UInt root,
			Mesh & mesh,
			UInt nb_tags,
			const ElementType & type,
			const Array<UInt> & partition_num,
			const CSR<UInt> & ghost_partition,
			UInt nb_local_element,
			UInt nb_ghost_element) {
			AKANTU_DEBUG_IN();

			static UInt count = 0;

			StaticCommunicator & comm = StaticCommunicator::getStaticCommunicator();
			UInt nb_proc = comm.getNbProc();
			UInt my_rank = comm.whoAmI();

			if(nb_tags == 0) {
			AKANTU_DEBUG_OUT();
			return;
			}

			UInt mesh_data_sizes_buffer_length;
			MeshData & mesh_data = mesh.getMeshData();

			/// tag info
			std::vector<std::string> tag_names;
			mesh.getMeshData().getTagNames(tag_names, 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;
			std::vector<std::string>::const_iterator names_it = tag_names.begin();
			std::vector<std::string>::const_iterator names_end = tag_names.end();
			for(;names_it != names_end; ++names_it) {
			mesh_data_sizes_buffer << *names_it;
			mesh_data_sizes_buffer << mesh_data.getTypeCode(*names_it);
			mesh_data_sizes_buffer << mesh_data.getNbComponent(*names_it, type);
			}

			mesh_data_sizes_buffer_length = mesh_data_sizes_buffer.getSize();
			AKANTU_DEBUG_INFO("Broadcasting the size of the information about the mesh data tags: (" << mesh_data_sizes_buffer_length << ")." );
			comm.broadcast(&mesh_data_sizes_buffer_length, 1, root);
			AKANTU_DEBUG_INFO("Broadcasting the information about the mesh data tags, addr " << (void*)mesh_data_sizes_buffer.storage());

			if(mesh_data_sizes_buffer_length !=0)
			comm.broadcast(mesh_data_sizes_buffer.storage(), mesh_data_sizes_buffer.getSize(), root);


			if(mesh_data_sizes_buffer_length !=0) {
			//Sending the actual data to each processor
			DynamicCommunicationBuffer buffers[nb_proc];
			std::vector<std::string>::const_iterator names_it = tag_names.begin();
			std::vector<std::string>::const_iterator names_end = tag_names.end();

			// Loop over each tag for the current type
			for(;names_it != names_end; ++names_it) {
			// Type code of the current tag (i.e. the tag named *names_it)
			communicator.fillTagBuffer(mesh_data,
			buffers,
			*names_it,
			type,
			partition_num,
			ghost_partition);
			}

			std::vector<CommunicationRequest *> requests;
			for (UInt p = 0; p < nb_proc; ++p) {
			if(p != root) {
			AKANTU_DEBUG_INFO("Sending " << buffers[p].getSize() << " bytes of mesh data to proc " << p << " TAG("<< Tag::genTag(my_rank, count, TAG_MESH_DATA) <<")");

			requests.push_back(comm.asyncSend(buffers[p].storage(),
			buffers[p].getSize(), p, Tag::genTag(my_rank, count, TAG_MESH_DATA)));
			}
			}

			names_it = tag_names.begin();
			// Loop over each tag for the current type
			for(;names_it != names_end; ++names_it) {
			// Reinitializing the mesh data on the master
			communicator.populateMeshData(mesh_data,
			buffers[root],
			*names_it,
			type,
			mesh_data.getTypeCode(*names_it),
			mesh_data.getNbComponent(*names_it, type),
			nb_local_element,
			nb_ghost_element);
			}


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

			++count;

			AKANTU_DEBUG_OUT();
			}



			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::synchronizeTagsRecv(DistributedSynchronizer & communicator,
			UInt root,
			Mesh & mesh,
			UInt nb_tags,
			const ElementType & type,
			UInt nb_local_element,
			UInt nb_ghost_element) {
			AKANTU_DEBUG_IN();

			static UInt count = 0;

			StaticCommunicator & comm = StaticCommunicator::getStaticCommunicator();

			if(nb_tags == 0) {
			AKANTU_DEBUG_OUT();
			return;
			}

			/* --------<<<<-TAGS------------------------------------------------- */
			UInt mesh_data_sizes_buffer_length = 0;
			CommunicationBuffer mesh_data_sizes_buffer;
			MeshData & mesh_data = mesh.getMeshData();

			AKANTU_DEBUG_INFO("Receiving the size of the information about the mesh data tags.");
			comm.broadcast(&mesh_data_sizes_buffer_length, 1, root);

			if(mesh_data_sizes_buffer_length != 0) {
			mesh_data_sizes_buffer.resize(mesh_data_sizes_buffer_length);
			AKANTU_DEBUG_INFO("Receiving the information about the mesh data tags, addr " << (void*)mesh_data_sizes_buffer.storage());
			comm.broadcast(mesh_data_sizes_buffer.storage(), mesh_data_sizes_buffer_length, root);
			AKANTU_DEBUG_INFO("Size of the information about the mesh data: " << mesh_data_sizes_buffer_length);

			std::vector<std::string> tag_names;
			std::vector<MeshDataTypeCode> tag_type_codes;
			std::vector<UInt> tag_nb_component;
			tag_names.resize(nb_tags);
			tag_type_codes.resize(nb_tags);
			tag_nb_component.resize(nb_tags);
			CommunicationBuffer mesh_data_buffer;
			UInt type_code_int;
			for(UInt i(0); i < nb_tags; ++i) {
			mesh_data_sizes_buffer >> tag_names[i];
			mesh_data_sizes_buffer >> type_code_int;
			tag_type_codes[i] = static_cast<MeshDataTypeCode>(type_code_int);
			mesh_data_sizes_buffer >> tag_nb_component[i];
			}

			std::vector<std::string>::const_iterator names_it = tag_names.begin();
			std::vector<std::string>::const_iterator names_end = tag_names.end();

			CommunicationStatus mesh_data_comm_status;
			AKANTU_DEBUG_INFO("Checking size of data to receive for mesh data TAG("
			<< Tag::genTag(root, count, TAG_MESH_DATA) << ")");
			comm.probe<char>(root, Tag::genTag(root, count, TAG_MESH_DATA), mesh_data_comm_status);
			UInt mesh_data_buffer_size(mesh_data_comm_status.getSize());
			AKANTU_DEBUG_INFO("Receiving " << mesh_data_buffer_size
			<< " bytes of mesh data TAG("
			<< Tag::genTag(root, count, TAG_MESH_DATA) << ")");
			mesh_data_buffer.resize(mesh_data_buffer_size);
			comm.receive(mesh_data_buffer.storage(),
			mesh_data_buffer_size,
			root,
			Tag::genTag(root, count, TAG_MESH_DATA));

			// Loop over each tag for the current type
			UInt k(0);
			for(; names_it != names_end; ++names_it, ++k) {
			communicator.populateMeshData(mesh_data, mesh_data_buffer,
			*names_it, type,
			tag_type_codes[k],
			tag_nb_component[k],
			nb_local_element, nb_ghost_element);
			}
			}

			++count;

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			template<class CommunicationBuffer>
			void DistributedSynchronizer::fillElementGroupsFromBuffer(DistributedSynchronizer & communicator,
			Mesh & mesh,
			const ElementType & type,
			CommunicationBuffer & buffer) {
			AKANTU_DEBUG_IN();

			Element el;
			el.type = type;

			for (ghost_type_t::iterator gt = ghost_type_t::begin(); gt != ghost_type_t::end(); ++gt) {
			UInt nb_element = mesh.getNbElement(type, *gt);
			el.ghost_type = *gt;

			for (UInt e = 0; e < nb_element; ++e) {
			el.element = e;

			std::vector<std::string> element_to_group;
			buffer >> element_to_group;

			AKANTU_DEBUG_ASSERT(e < mesh.getNbElement(type, *gt), "The mesh does not have the element " << e);

			std::vector<std::string>::iterator it = element_to_group.begin();
			std::vector<std::string>::iterator end = element_to_group.end();
			for (; it != end; ++it) {
			mesh.getElementGroup(*it).add(el, false, false);
			}
			}
			}

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::synchronizeElementGroups(DistributedSynchronizer & communicator,
			UInt root,
			Mesh & mesh,
			const ElementType & type,
			const Array<UInt> & partition_num,
			const CSR<UInt> & ghost_partition,
			UInt nb_element) {
			AKANTU_DEBUG_IN();

			StaticCommunicator & comm = StaticCommunicator::getStaticCommunicator();

			UInt nb_proc = comm.getNbProc();
			UInt my_rank = comm.whoAmI();

			DynamicCommunicationBuffer buffers[nb_proc];

			typedef std::vector< std::vector<std::string> > ElementToGroup;
			ElementToGroup element_to_group;
			element_to_group.resize(nb_element);

			GroupManager::const_element_group_iterator egi = mesh.element_group_begin();
			GroupManager::const_element_group_iterator ege = mesh.element_group_end();
			for (; egi != ege; ++egi) {
			ElementGroup & eg = *(egi->second);

			std::string name = egi->first;

			ElementGroup::const_element_iterator eit = eg.element_begin(type, _not_ghost);
			ElementGroup::const_element_iterator eend = eg.element_end(type, _not_ghost);
			for (; eit != eend; ++eit) {
			element_to_group[*eit].push_back(name);
			}

			eit = eg.element_begin(type, _not_ghost);
			if(eit != eend)
			const_cast<Array<UInt> &>(eg.getElements(type)).empty();
			}

			/// preparing the buffers
			const UInt * part = partition_num.storage();

			/// copying the data, element by element
			ElementToGroup::const_iterator data_it = element_to_group.begin();
			ElementToGroup::const_iterator data_end = element_to_group.end();
			for (; data_it != data_end; ++part, ++data_it) {
			buffers[part] << data_it;
			}

			data_it = element_to_group.begin();
			/// copying the data for the ghost element
			for (UInt el(0); data_it != data_end; ++data_it, ++el) {
			CSR<UInt>::const_iterator it = ghost_partition.begin(el);
			CSR<UInt>::const_iterator end = ghost_partition.end(el);
			for (;it != end; ++it) {
			UInt proc = *it;
			buffers[proc] << *data_it;
			}
			}


			std::vector<CommunicationRequest *> requests;
			for (UInt p = 0; p < nb_proc; ++p) {
			if(p == my_rank) continue;
			AKANTU_DEBUG_INFO("Sending element groups to proc " << p
			<< " TAG("<< Tag::genTag(my_rank, p, TAG_ELEMENT_GROUP) <<")");
			requests.push_back(comm.asyncSend(buffers[p].storage(),
			buffers[p].getSize(),
			p,
			Tag::genTag(my_rank, p, TAG_ELEMENT_GROUP)));
			}

			fillElementGroupsFromBuffer(communicator, mesh, type, buffers[my_rank]);

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

			AKANTU_DEBUG_OUT();
			}


			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::synchronizeElementGroups(DistributedSynchronizer & communicator,
			UInt root,
			Mesh & mesh,
			const ElementType & type) {
			AKANTU_DEBUG_IN();

			StaticCommunicator & comm = StaticCommunicator::getStaticCommunicator();
			UInt my_rank = comm.whoAmI();


			AKANTU_DEBUG_INFO("Receiving element groups from proc " << root
			<< " TAG("<< Tag::genTag(root, my_rank, TAG_ELEMENT_GROUP) <<")");

			CommunicationStatus status;
			comm.probe<char>(root, Tag::genTag(root, my_rank, TAG_ELEMENT_GROUP), status);

			CommunicationBuffer buffer(status.getSize());
			comm.receive(buffer.storage(), buffer.getSize(), root, Tag::genTag(root, my_rank, TAG_ELEMENT_GROUP));

			fillElementGroupsFromBuffer(communicator, mesh, type, buffer);

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			template<class CommunicationBuffer>
			void DistributedSynchronizer::fillNodeGroupsFromBuffer(DistributedSynchronizer & communicator,
			Mesh & mesh,
			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 Array<UInt> & global_nodes = mesh.getGlobalNodesIds();

			Array<UInt>::const_scalar_iterator nbegin = global_nodes.begin();
			Array<UInt>::const_scalar_iterator nit = global_nodes.begin();
			Array<UInt>::const_scalar_iterator nend = global_nodes.end();

			for (; nit != nend; ++nit) {
			std::vector<std::string>::iterator it = node_to_group[*nit].begin();
			std::vector<std::string>::iterator end = node_to_group[*nit].end();

			for (; it != end; ++it) {
			mesh.getNodeGroup(*it).add(nit - nbegin, false);
			}
			}

			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);
			ng.optimize();
			}

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::synchronizeNodeGroupsMaster(DistributedSynchronizer & communicator,
			UInt root,
			Mesh & mesh) {
			AKANTU_DEBUG_IN();

			StaticCommunicator & comm = StaticCommunicator::getStaticCommunicator();

			UInt nb_proc = comm.getNbProc();
			UInt my_rank = comm.whoAmI();

			UInt nb_total_nodes = mesh.getNbGlobalNodes();

			DynamicCommunicationBuffer buffer;

			typedef std::vector< std::vector<std::string> > NodeToGroup;
			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 == my_rank) continue;
			AKANTU_DEBUG_INFO("Sending node groups to proc " << p
			<< " TAG("<< Tag::genTag(my_rank, p, TAG_NODE_GROUP) <<")");
			requests.push_back(comm.asyncSend(buffer.storage(),
			buffer.getSize(),
			p,
			Tag::genTag(my_rank, p, TAG_NODE_GROUP)));
			}

			fillNodeGroupsFromBuffer(communicator, mesh, buffer);

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

			AKANTU_DEBUG_OUT();
			}

			/* -------------------------------------------------------------------------- */
			void DistributedSynchronizer::synchronizeNodeGroupsSlaves(DistributedSynchronizer & communicator,
			UInt root,
			Mesh & mesh) {
			AKANTU_DEBUG_IN();

			StaticCommunicator & comm = StaticCommunicator::getStaticCommunicator();
			UInt my_rank = comm.whoAmI();


			AKANTU_DEBUG_INFO("Receiving node groups from proc " << root
			<< " TAG("<< Tag::genTag(root, my_rank, TAG_NODE_GROUP) <<")");

			CommunicationStatus status;
			comm.probe<char>(root, Tag::genTag(root, my_rank, TAG_NODE_GROUP), status);

			CommunicationBuffer buffer(status.getSize());
			comm.receive(buffer.storage(), buffer.getSize(), root, Tag::genTag(root, my_rank, TAG_NODE_GROUP));

			fillNodeGroupsFromBuffer(communicator, mesh, buffer);

			AKANTU_DEBUG_OUT();
			}

			__END_AKANTU__

rAKA/src/synchronizer/distributed_synchronizer.cc848f0fd8c83breleases/10.1007/s40571…

distributed_synchronizer.ccView Options

rAKA/src/synchronizer/distributed_synchronizer.cc
848f0fd8c83breleases/10.1007/s40571…

distributed_synchronizer.cc
View Options