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dof_synchronizer.cc
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/**
* @file dof_synchronizer.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Fri Jun 17 2011
* @date last modification: Thu Mar 27 2014
*
* @brief DOF synchronizing object implementation
*
* @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 "dof_synchronizer.hh"
#include "mesh.hh"
/* -------------------------------------------------------------------------- */
__BEGIN_AKANTU__
/* -------------------------------------------------------------------------- */
DOFSynchronizer::DOFSynchronizer(const Mesh & mesh, UInt nb_degree_of_freedom) :
global_dof_equation_numbers(0, 1, "global_equation_number"),
local_dof_equation_numbers(0, 1, "local_equation_number"),
dof_global_ids(0, 1, "global_ids"),
dof_types(0, 1, "types") {
gather_scatter_scheme_initialized = false;
communicator = &StaticCommunicator::getStaticCommunicator();
prank = communicator->whoAmI();
psize = communicator->getNbProc();
proc_informations.resize(psize);
UInt nb_nodes = mesh.getNbNodes();
nb_dofs = nb_nodes * nb_degree_of_freedom;
dof_global_ids.resize(nb_dofs);
dof_types.resize(nb_dofs);
nb_global_dofs = mesh.getNbGlobalNodes() * nb_degree_of_freedom;
UInt * dof_global_id = dof_global_ids.storage();
Int * dof_type = dof_types.storage();
for(UInt n = 0, ld = 0; n < nb_nodes; ++n) {
UInt node_global_id = mesh.getNodeGlobalId(n);
UInt node_type = mesh.getNodeType(n);
for (UInt d = 0; d < nb_degree_of_freedom; ++d, ++ld) {
*dof_global_id = node_global_id * nb_degree_of_freedom + d;
global_dof_to_local[*dof_global_id] = ld;
*(dof_type++) = node_type;
dof_global_id++;
}
}
if(psize == 1) return;
/// creating communication scheme
dof_global_id = dof_global_ids.storage();
dof_type = dof_types.storage();
for (UInt n = 0; n < nb_dofs; ++n) {
if(*dof_type >= 0) {
proc_informations[*dof_type].master_dofs.push_back(n);
}
dof_type++;
}
/// exchanging information
for (UInt p = 1; p < psize; ++p) {
UInt sendto = (psize + prank + p) % psize;
UInt recvfrom = (psize + prank - p) % psize;
UInt nb_master_dofs = proc_informations[sendto].master_dofs.getSize();
UInt * master_dofs = proc_informations[sendto].master_dofs.storage();
UInt * send_buffer = new UInt[nb_master_dofs];
for (UInt d = 0; d < nb_master_dofs; ++d) {
send_buffer[d] = dof_global_id[master_dofs[d]];
}
UInt nb_slave_dofs = 0;
UInt * recv_buffer;
std::vector<CommunicationRequest *> requests;
requests.push_back(communicator->asyncSend(&nb_master_dofs, 1, sendto, 0));
if(nb_master_dofs != 0) {
AKANTU_DEBUG(dblInfo, "Sending "<< nb_master_dofs << " nodes to " << sendto + 1);
requests.push_back(communicator->asyncSend(send_buffer, nb_master_dofs, sendto, 1));
}
communicator->receive(&nb_slave_dofs, 1, recvfrom, 0);
if(nb_slave_dofs != 0) {
AKANTU_DEBUG(dblInfo, "Receiving "<< nb_slave_dofs << " nodes from " << recvfrom + 1);
proc_informations[recvfrom].slave_dofs.resize(nb_slave_dofs);
recv_buffer = proc_informations[recvfrom].slave_dofs.storage();
communicator->receive(recv_buffer, nb_slave_dofs, recvfrom, 1);
}
for (UInt d = 0; d < nb_slave_dofs; ++d) {
recv_buffer[d] = global_dof_to_local[recv_buffer[d]];
}
communicator->waitAll(requests);
communicator->freeCommunicationRequest(requests);
requests.clear();
delete [] send_buffer;
}
}
/* -------------------------------------------------------------------------- */
DOFSynchronizer::~DOFSynchronizer() {
}
/* -------------------------------------------------------------------------- */
void DOFSynchronizer::initLocalDOFEquationNumbers() {
AKANTU_DEBUG_IN();
local_dof_equation_numbers.resize(nb_dofs);
Int * dof_equation_number = local_dof_equation_numbers.storage();
for (UInt d = 0; d < nb_dofs; ++d) {
*(dof_equation_number++) = d;
}
//local_dof_equation_numbers.resize(nb_dofs);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void DOFSynchronizer::initGlobalDOFEquationNumbers() {
AKANTU_DEBUG_IN();
global_dof_equation_numbers.resize(nb_dofs);
Int * dof_type = dof_types.storage();
UInt * dof_global_id = dof_global_ids.storage();
Int * dof_equation_number = global_dof_equation_numbers.storage();
for(UInt d = 0; d < nb_dofs; ++d) {
/// if ghost dof the equation_number is greater than nb_global_dofs
Int global_eq_num = *dof_global_id + (*dof_type > -3 ? 0 : nb_global_dofs);
*(dof_equation_number) = global_eq_num;
global_dof_equation_number_to_local[global_eq_num] = d;
dof_equation_number++;
dof_global_id++;
dof_type++;
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void DOFSynchronizer::initScatterGatherCommunicationScheme() {
AKANTU_DEBUG_IN();
if(psize == 1 || gather_scatter_scheme_initialized) {
if(psize == 1) gather_scatter_scheme_initialized = true;
AKANTU_DEBUG_OUT();
return;
}
/// creating communication scheme
UInt * dof_global_id = dof_global_ids.storage();
Int * dof_type = dof_types.storage();
Array<UInt> * local_dofs = new Array<UInt>(0,2);
UInt local_dof_val[2];
nb_needed_dofs = 0;
nb_local_dofs = 0;
for (UInt n = 0; n < nb_dofs; ++n) {
if(*dof_type != -3) {
local_dof_val[0] = *dof_global_id;
if(*dof_type == -1 || *dof_type == -2) {
local_dof_val[1] = 0; // master for this node, shared or not
nb_local_dofs++;
} else if (*dof_type >= 0) {
nb_needed_dofs++;
local_dof_val[1] = 1; // slave node
}
local_dofs->push_back(local_dof_val);
}
dof_type++;
dof_global_id++;
}
Int * nb_dof_per_proc = new Int[psize];
nb_dof_per_proc[prank] = local_dofs->getSize();
communicator->allGather(nb_dof_per_proc, 1);
AKANTU_DEBUG(dblDebug, "I have " << local_dofs->getSize() << " not ghost dofs ("
<< nb_local_dofs << " local and " << nb_needed_dofs << " slave)");
UInt pos = 0;
for (UInt p = 0; p < prank; ++p) pos += nb_dof_per_proc[p];
UInt nb_total_dofs = pos;
for (UInt p = prank; p < psize; ++p) nb_total_dofs += nb_dof_per_proc[p];
Int * nb_values = new Int[psize];
for (UInt p = 0; p < psize; ++p) nb_values[p] = nb_dof_per_proc[p] * 2;
UInt * buffer = new UInt[2*nb_total_dofs];
memcpy(buffer + 2 * pos, local_dofs->storage(), local_dofs->getSize() * 2 * sizeof(UInt));
delete local_dofs;
communicator->allGatherV(buffer, nb_values);
UInt * tmp_buffer = buffer;
for (UInt p = 0; p < psize; ++p) {
UInt proc_p_nb_dof = nb_dof_per_proc[p];
if (p != prank){
AKANTU_DEBUG(dblDebug, "I get " << proc_p_nb_dof << "(" << nb_values[p] << ") dofs from " << p + 1);
proc_informations[p].dofs.resize(0);
for (UInt dd = 0; dd < proc_p_nb_dof; ++dd) {
UInt dof = tmp_buffer[2*dd];
if(tmp_buffer[2*dd + 1] == 0)
proc_informations[p].dofs.push_back(dof);
else
proc_informations[p].needed_dofs.push_back(dof);
}
AKANTU_DEBUG(dblDebug, "Proc " << p + 1 << " sends me "
<< proc_informations[p].dofs.getSize() << " local dofs, and "
<< proc_informations[p].needed_dofs.getSize() << " slave dofs");
}
tmp_buffer += 2*proc_p_nb_dof;
}
delete [] nb_dof_per_proc;
delete [] buffer;
delete [] nb_values;
gather_scatter_scheme_initialized = true;
AKANTU_DEBUG_OUT();
}
__END_AKANTU__

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