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rAKA/src/mesh_utils/global_ids_updater.cc
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global_ids_updater.cc
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/**
* @file global_ids_updater.cc
*
* @author Marco Vocialta <marco.vocialta@epfl.ch>
*
* @date creation: Fri Apr 13 2012
* @date last modification: Fri Dec 08 2017
*
* @brief Functions of the GlobalIdsUpdater
*
* @section LICENSE
*
* Copyright (©) 2010-2018 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 "global_ids_updater.hh"
#include "element_synchronizer.hh"
#include "mesh_accessor.hh"
#include "mesh_utils.hh"
/* -------------------------------------------------------------------------- */
#include <numeric>
/* -------------------------------------------------------------------------- */
namespace akantu {
UInt GlobalIdsUpdater::updateGlobalIDs(UInt local_nb_new_nodes) {
UInt total_nb_new_nodes = this->updateGlobalIDsLocally(local_nb_new_nodes);
if(mesh.isDistributed()) {
this->synchronizeGlobalIDs();
}
return total_nb_new_nodes;
}
UInt GlobalIdsUpdater::updateGlobalIDsLocally(UInt local_nb_new_nodes) {
const auto & comm = mesh.getCommunicator();
Int rank = comm.whoAmI();
Int nb_proc = comm.getNbProc();
if (nb_proc == 1)
return local_nb_new_nodes;
/// resize global ids array
Array<UInt> & nodes_global_ids = mesh.getGlobalNodesIds();
UInt old_nb_nodes = mesh.getNbNodes() - local_nb_new_nodes;
nodes_global_ids.resize(mesh.getNbNodes(), -1);
/// compute the number of global nodes based on the number of old nodes
Matrix<UInt> local_master_nodes(2, nb_proc, 0);
for (UInt n = 0; n < old_nb_nodes; ++n)
if (mesh.isLocalOrMasterNode(n))
++local_master_nodes(0, rank);
/// compute amount of local or master doubled nodes
for (UInt n = old_nb_nodes; n < mesh.getNbNodes(); ++n)
if (mesh.isLocalOrMasterNode(n))
++local_master_nodes(1, rank);
comm.allGather(local_master_nodes);
local_master_nodes = local_master_nodes.transpose();
UInt old_global_nodes =
std::accumulate(local_master_nodes(0).storage(),
local_master_nodes(0).storage() + nb_proc, 0);
/// update global number of nodes
UInt total_nb_new_nodes =
std::accumulate(local_master_nodes(1).storage(),
local_master_nodes(1).storage() + nb_proc, 0);
if (total_nb_new_nodes == 0)
return 0;
/// set global ids of local and master nodes
UInt starting_index =
std::accumulate(local_master_nodes(1).storage(),
local_master_nodes(1).storage() + rank, old_global_nodes);
for (UInt n = old_nb_nodes; n < mesh.getNbNodes(); ++n) {
if (mesh.isLocalOrMasterNode(n)) {
nodes_global_ids(n) = starting_index;
++starting_index;
} else {
nodes_global_ids(n) = -1;
}
}
MeshAccessor mesh_accessor(mesh);
mesh_accessor.setNbGlobalNodes(old_global_nodes + total_nb_new_nodes);
return total_nb_new_nodes;
}
void GlobalIdsUpdater::synchronizeGlobalIDs() {
this->reduce = true;
this->synchronizer.slaveReductionOnce(*this, _gst_giu_global_conn);
this->reduce = false;
this->synchronizer.synchronizeOnce(*this, _gst_giu_global_conn);
}
} // akantu
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