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mesh_partition.cc
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/**
* @file mesh_partition.cc
*
* @author David Simon Kammer <david.kammer@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Tue Aug 17 2010
* @date last modification: Mon Jul 21 2014
*
* @brief implementation of common part of all partitioner
*
* @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 "mesh_partition.hh"
#include "mesh_utils.hh"
#include "aka_types.hh"
/* -------------------------------------------------------------------------- */
__BEGIN_AKANTU__
/* -------------------------------------------------------------------------- */
MeshPartition::MeshPartition(const Mesh & mesh, UInt spatial_dimension,
const ID & id,
const MemoryID & memory_id) :
Memory(id, memory_id),
mesh(mesh), spatial_dimension(spatial_dimension),
partitions ("partition" , id, memory_id),
ghost_partitions ("ghost_partition" , id, memory_id),
ghost_partitions_offset("ghost_partition_offset", id, memory_id),
saved_connectivity("saved_connectivity", id, memory_id) {
AKANTU_DEBUG_IN();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
MeshPartition::~MeshPartition() {
AKANTU_DEBUG_IN();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
/**
* conversion in c++ of the GENDUALMETIS (mesh.c) function wrote by George in
* Metis (University of Minnesota)
*/
void MeshPartition::buildDualGraph(Array<Int> & dxadj, Array<Int> & dadjncy,
Array<Int> & edge_loads,
const EdgeLoadFunctor & edge_load_func) {
AKANTU_DEBUG_IN();
// tweak mesh;
const Mesh::ConnectivityTypeList & type_list = mesh.getConnectivityTypeList();
UInt nb_types = type_list.size();
UInt nb_good_types = 0;
UInt nb_nodes_per_element_p1[nb_types];
UInt magic_number[nb_types];
// UInt * conn_val[nb_types];
UInt nb_element[nb_types];
Array<UInt> * conn[nb_types];
Array<Element> lin_to_element;
Element elem;
elem.ghost_type = _not_ghost;
const_cast<Mesh &>(mesh).updateTypesOffsets(_not_ghost);
const_cast<Mesh &>(mesh).updateTypesOffsets(_ghost);
Mesh::ConnectivityTypeList::const_iterator it;
for(it = type_list.begin(); it != type_list.end(); ++it) {
ElementType type = *it;
if(Mesh::getSpatialDimension(type) != mesh.getSpatialDimension()) continue;
elem.type = type;
ElementType type_p1 = Mesh::getP1ElementType(type);
nb_nodes_per_element_p1[nb_good_types] = Mesh::getNbNodesPerElement(type_p1);
nb_element[nb_good_types] = mesh.getConnectivity(type, _not_ghost).getSize();
magic_number[nb_good_types] =
Mesh::getNbNodesPerElement(Mesh::getFacetType(type_p1));
conn[nb_good_types] = &const_cast<Array<UInt> &>(mesh.getConnectivity(type, _not_ghost));
for (UInt i = 0; i < nb_element[nb_good_types]; ++i) {
elem.element = i;
lin_to_element.push_back(elem);
}
nb_good_types++;
}
CSR<UInt> node_to_elem;
MeshUtils::buildNode2Elements(mesh, node_to_elem);
UInt nb_total_element = 0;
UInt nb_total_node_element = 0;
for (UInt t = 0; t < nb_good_types; ++t) {
nb_total_element += nb_element[t];
nb_total_node_element += nb_element[t]*nb_nodes_per_element_p1[t];
}
dxadj.resize(nb_total_element + 1);
/// initialize the dxadj array
for (UInt t = 0, linerized_el = 0; t < nb_good_types; ++t)
for (UInt el = 0; el < nb_element[t]; ++el, ++linerized_el)
dxadj(linerized_el) = nb_nodes_per_element_p1[t];
/// convert the dxadj_val array in a csr one
for (UInt i = 1; i < nb_total_element; ++i) dxadj(i) += dxadj(i-1);
for (UInt i = nb_total_element; i > 0; --i) dxadj(i) = dxadj(i-1);
dxadj(0) = 0;
dadjncy.resize(2*dxadj(nb_total_element));
edge_loads.resize(2*dxadj(nb_total_element));
/// weight map to determine adjacency
unordered_map<UInt, UInt>::type weight_map;
for (UInt t = 0, linerized_el = 0; t < nb_good_types; ++t) {
for (UInt el = 0; el < nb_element[t]; ++el, ++linerized_el) {
/// fill the weight map
for (UInt n = 0; n < nb_nodes_per_element_p1[t]; ++n) {
UInt node = (*conn[t])(el, n);
CSR<UInt>::iterator k;
for (k = node_to_elem.rbegin(node); k != node_to_elem.rend(node); --k) {
UInt current_el = *k;
if(current_el <= linerized_el) break;
unordered_map<UInt, UInt>::type::iterator it_w;
it_w = weight_map.find(current_el);
if(it_w == weight_map.end()) {
weight_map[current_el] = 1;
} else {
it_w->second++;
}
}
}
/// each element with a weight of the size of a facet are adjacent
unordered_map<UInt, UInt>::type::iterator it_w;
for(it_w = weight_map.begin(); it_w != weight_map.end(); ++it_w) {
if(it_w->second == magic_number[t]) {
UInt adjacent_el = it_w->first;
#if defined(AKANTU_COHESIVE_ELEMENT)
/// Patch in order to prevent neighboring cohesive elements
/// from detecting each other
ElementKind linearized_el_kind = mesh.linearizedToElement(linerized_el).kind;
ElementKind adjacent_el_kind = mesh.linearizedToElement(adjacent_el).kind;
if (linearized_el_kind == adjacent_el_kind &&
linearized_el_kind == _ek_cohesive) continue;
#endif
UInt index_adj = dxadj(adjacent_el )++;
UInt index_lin = dxadj(linerized_el)++;
dadjncy(index_lin) = adjacent_el;
dadjncy(index_adj) = linerized_el;
}
}
weight_map.clear();
}
}
Int k_start = 0;
for (UInt t = 0, linerized_el = 0, j = 0; t < nb_good_types; ++t)
for (UInt el = 0; el < nb_element[t]; ++el, ++linerized_el) {
for (Int k = k_start; k < dxadj(linerized_el); ++k, ++j)
dadjncy(j) = dadjncy(k);
dxadj(linerized_el) = j;
k_start += nb_nodes_per_element_p1[t];
}
for (UInt i = nb_total_element; i > 0; --i) dxadj(i) = dxadj(i - 1);
dxadj(0) = 0;
UInt adj = 0;
for (UInt i = 0; i < nb_total_element; ++i) {
UInt nb_adj = dxadj(i + 1) - dxadj(i);
for (UInt j = 0; j < nb_adj; ++j, ++adj) {
Int el_adj_id = dadjncy(dxadj(i) + j);
Element el = lin_to_element(i);
Element el_adj = lin_to_element(el_adj_id);
Int load = edge_load_func(el, el_adj);
edge_loads(adj) = load;
}
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void MeshPartition::fillPartitionInformation(const Mesh & mesh,
const Int * linearized_partitions) {
AKANTU_DEBUG_IN();
CSR<UInt> node_to_elem;
MeshUtils::buildNode2Elements(mesh, node_to_elem);
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);
UInt linearized_el = 0;
for(; it != end; ++it) {
ElementType type = *it;
UInt nb_element = mesh.getNbElement(type);
UInt nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
partitions .alloc(nb_element, 1, type, _not_ghost);
CSR<UInt> & ghost_part_csr = ghost_partitions_csr(type, _not_ghost);
ghost_part_csr.resizeRows(nb_element);
ghost_partitions_offset.alloc(nb_element + 1, 1, type, _ghost);
ghost_partitions .alloc(0, 1, type, _ghost);
const Array<UInt> & connectivity = mesh.getConnectivity(type, _not_ghost);
for (UInt el = 0; el < nb_element; ++el, ++linearized_el) {
UInt part = linearized_partitions[linearized_el];
partitions(type, _not_ghost)(el) = part;
std::list<UInt> list_adj_part;
for (UInt n = 0; n < nb_nodes_per_element; ++n) {
UInt node = connectivity.storage()[el * nb_nodes_per_element + n];
CSR<UInt>::iterator ne;
for (ne = node_to_elem.begin(node); ne != node_to_elem.end(node); ++ne) {
UInt adj_el = *ne;
UInt adj_part = linearized_partitions[adj_el];
if(part != adj_part) {
list_adj_part.push_back(adj_part);
}
}
}
list_adj_part.sort();
list_adj_part.unique();
for(std::list<UInt>::iterator adj_it = list_adj_part.begin();
adj_it != list_adj_part.end();
++adj_it) {
ghost_part_csr.getRows().push_back(*adj_it);
ghost_part_csr.rowOffset(el)++;
ghost_partitions(type, _ghost).push_back(*adj_it);
ghost_partitions_offset(type, _ghost)(el)++;
}
}
ghost_part_csr.countToCSR();
/// convert the ghost_partitions_offset array in an offset array
Array<UInt> & ghost_partitions_offset_ptr = ghost_partitions_offset(type, _ghost);
for (UInt i = 1; i < nb_element; ++i)
ghost_partitions_offset_ptr(i) += ghost_partitions_offset_ptr(i-1);
for (UInt i = nb_element; i > 0; --i)
ghost_partitions_offset_ptr(i) = ghost_partitions_offset_ptr(i-1);
ghost_partitions_offset_ptr(0) = 0;
}
// All Facets
for(Int sp = spatial_dimension - 1; sp >= 0; --sp) {
Mesh::type_iterator fit = mesh.firstType(sp,
_not_ghost,
_ek_not_defined);
Mesh::type_iterator fend = mesh.lastType(sp,
_not_ghost,
_ek_not_defined);
for(; fit != fend; ++fit) {
ElementType type = *fit;
UInt nb_element = mesh.getNbElement(type);
partitions .alloc(nb_element, 1, type, _not_ghost);
AKANTU_DEBUG_INFO("Allocating partitions for " << type);
CSR<UInt> & ghost_part_csr = ghost_partitions_csr(type, _not_ghost);
ghost_part_csr.resizeRows(nb_element);
ghost_partitions_offset.alloc(nb_element + 1, 1, type, _ghost);
ghost_partitions .alloc(0, 1, type, _ghost);
AKANTU_DEBUG_INFO("Allocating ghost_partitions for " << type);
const Array< std::vector<Element> > & elem_to_subelem = mesh.getElementToSubelement(type, _not_ghost);
for(UInt i(0); i < mesh.getNbElement(type, _not_ghost); ++i) { // Facet loop
const std::vector<Element> & adjacent_elems = elem_to_subelem(i);
if(!adjacent_elems.empty()) {
Element min_elem;
UInt min_part(std::numeric_limits<UInt>::max());
std::set<UInt> adjacent_parts;
for(UInt j(0); j < adjacent_elems.size(); ++j) {
UInt adjacent_elem_id = adjacent_elems[j].element;
UInt adjacent_elem_part = partitions(adjacent_elems[j].type, adjacent_elems[j].ghost_type)(adjacent_elem_id);
if(adjacent_elem_part < min_part) {
min_part = adjacent_elem_part;
min_elem = adjacent_elems[j];
}
adjacent_parts.insert(adjacent_elem_part);
}
partitions(type, _not_ghost)(i) = min_part;
CSR<UInt>::iterator git = ghost_partitions_csr(min_elem.type, _not_ghost).begin(min_elem.element);
CSR<UInt>::iterator gend = ghost_partitions_csr(min_elem.type, _not_ghost).end(min_elem.element);
for(; git != gend; ++git) {
adjacent_parts.insert(*git);
}
adjacent_parts.erase(min_part);
std::set<UInt>::const_iterator pit = adjacent_parts.begin();
std::set<UInt>::const_iterator pend = adjacent_parts.end();
for(; pit != pend; ++pit) {
ghost_part_csr.getRows().push_back(*pit);
ghost_part_csr.rowOffset(i)++;
ghost_partitions(type, _ghost).push_back(*pit);
}
ghost_partitions_offset(type, _ghost)(i+1) = ghost_partitions_offset(type, _ghost)(i+1)
+ adjacent_elems.size();
} else {
partitions(type, _not_ghost)(i) = 0;
}
}
ghost_part_csr.countToCSR();
}
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void MeshPartition::tweakConnectivity(const Array<UInt> & pairs) {
AKANTU_DEBUG_IN();
if(pairs.getSize() == 0) return;
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);
for(; it != end; ++it) {
ElementType type = *it;
Array<UInt> & conn = const_cast<Array<UInt> &>(mesh.getConnectivity(type, _not_ghost));
UInt nb_nodes_per_element = conn.getNbComponent();
UInt nb_element = conn.getSize();
Array<UInt> & saved_conn = saved_connectivity.alloc(nb_element, nb_nodes_per_element, type, _not_ghost);
saved_conn.copy(conn);
for (UInt i = 0; i < pairs.getSize(); ++i) {
for (UInt el = 0; el < nb_element; ++el) {
for (UInt n = 0; n < nb_nodes_per_element; ++n) {
if(pairs(i, 1) == conn(el, n))
conn(el, n) = pairs(i, 0);
}
}
}
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void MeshPartition::restoreConnectivity() {
AKANTU_DEBUG_IN();
ElementTypeMapArray<UInt>::type_iterator it = saved_connectivity.firstType(spatial_dimension,
_not_ghost,
_ek_not_defined);
ElementTypeMapArray<UInt>::type_iterator end = saved_connectivity.lastType(spatial_dimension,
_not_ghost,
_ek_not_defined);
for(; it != end; ++it) {
ElementType type = *it;
Array<UInt> & conn = const_cast<Array<UInt> &>(mesh.getConnectivity(type, _not_ghost));
Array<UInt> & saved_conn = saved_connectivity(type, _not_ghost);
conn.copy(saved_conn);
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
__END_AKANTU__

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