1 /* Copyright (c) 2014-2021. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "src/surf/network_ib.hpp"
7 #include "simgrid/kernel/routing/NetPoint.hpp"
8 #include "simgrid/sg_config.hpp"
9 #include "src/kernel/EngineImpl.hpp"
10 #include "src/surf/HostImpl.hpp"
11 #include "src/surf/xml/platf.hpp"
12 #include "surf/surf.hpp"
14 #include <boost/algorithm/string/classification.hpp>
15 #include <boost/algorithm/string/split.hpp>
17 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_network);
19 static void IB_create_host_callback(simgrid::s4u::Host const& host)
21 using simgrid::kernel::resource::IBNode;
22 using simgrid::kernel::resource::NetworkIBModel;
25 auto* ibModel = static_cast<NetworkIBModel*>(host.get_netpoint()->get_englobing_zone()->get_network_model().get());
26 ibModel->active_nodes.emplace(host.get_name(), IBNode(id));
30 static void IB_action_state_changed_callback(simgrid::kernel::resource::NetworkAction& action,
31 simgrid::kernel::resource::Action::State /*previous*/)
33 using simgrid::kernel::resource::IBNode;
35 if (action.get_state() != simgrid::kernel::resource::Action::State::FINISHED)
37 auto* ibModel = static_cast<simgrid::kernel::resource::NetworkIBModel*>(action.get_model());
38 std::pair<IBNode*, IBNode*> pair = ibModel->active_comms[&action];
39 XBT_DEBUG("IB callback - action %p finished", &action);
41 ibModel->updateIBfactors(&action, pair.first, pair.second, 1);
43 ibModel->active_comms.erase(&action);
46 static void IB_action_init_callback(simgrid::kernel::resource::NetworkAction& action)
48 auto* ibModel = static_cast<simgrid::kernel::resource::NetworkIBModel*>(action.get_model());
49 auto* act_src = &ibModel->active_nodes.at(action.get_src().get_name());
50 auto* act_dst = &ibModel->active_nodes.at(action.get_dst().get_name());
52 ibModel->active_comms[&action] = std::make_pair(act_src, act_dst);
53 ibModel->updateIBfactors(&action, act_src, act_dst, 0);
60 /************************************************************************/
61 /* New model based on MPI contention model for Infiniband platforms */
62 /************************************************************************/
63 /* @Inproceedings{mescal_vienne_phd, */
64 /* author={Jérôme Vienne}, */
65 /* title={prédiction de performances d’applications de calcul haute performance sur réseau Infiniband}, */
66 /* address={Grenoble FRANCE}, */
70 void surf_network_model_init_IB()
72 auto net_model = std::make_shared<simgrid::kernel::resource::NetworkIBModel>("Network_IB");
73 simgrid::kernel::EngineImpl::get_instance()->add_model(net_model);
74 simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_network_model(net_model);
76 simgrid::s4u::Link::on_communication_state_change.connect(IB_action_state_changed_callback);
77 simgrid::s4u::Link::on_communicate.connect(IB_action_init_callback);
78 simgrid::s4u::Host::on_creation.connect(IB_create_host_callback);
79 simgrid::config::set_default<double>("network/weight-S", 8775);
86 NetworkIBModel::NetworkIBModel(const std::string& name) : NetworkSmpiModel(name)
88 std::string IB_factors_string = config::get_value<std::string>("smpi/IB-penalty-factors");
89 std::vector<std::string> radical_elements;
90 boost::split(radical_elements, IB_factors_string, boost::is_any_of(";"));
92 surf_parse_assert(radical_elements.size() == 3, "smpi/IB-penalty-factors should be provided and contain 3 "
93 "elements, semi-colon separated. Example: 0.965;0.925;1.35");
96 Be = std::stod(radical_elements.front());
97 } catch (const std::invalid_argument& ia) {
98 throw std::invalid_argument(std::string("First part of smpi/IB-penalty-factors is not numerical:") + ia.what());
102 Bs = std::stod(radical_elements.at(1));
103 } catch (const std::invalid_argument& ia) {
104 throw std::invalid_argument(std::string("Second part of smpi/IB-penalty-factors is not numerical:") + ia.what());
108 ys = std::stod(radical_elements.back());
109 } catch (const std::invalid_argument& ia) {
110 throw std::invalid_argument(std::string("Third part of smpi/IB-penalty-factors is not numerical:") + ia.what());
114 void NetworkIBModel::computeIBfactors(IBNode* root) const
116 double num_comm_out = root->ActiveCommsUp.size();
117 double max_penalty_out = 0.0;
118 // first, compute all outbound penalties to get their max
119 for (ActiveComm const* comm : root->ActiveCommsUp) {
120 double my_penalty_out = 1.0;
122 if (num_comm_out != 1) {
123 if (comm->destination->nbActiveCommsDown > 2) // number of comms sent to the receiving node
124 my_penalty_out = num_comm_out * Bs * ys;
126 my_penalty_out = num_comm_out * Bs;
129 max_penalty_out = std::max(max_penalty_out, my_penalty_out);
132 for (ActiveComm* comm : root->ActiveCommsUp) {
133 // compute inbound penalty
134 double my_penalty_in = 1.0;
135 int nb_comms = comm->destination->nbActiveCommsDown; // total number of incoming comms
137 my_penalty_in = (comm->destination->ActiveCommsDown)[root] // number of comm sent to dest by root node
138 * Be * comm->destination->ActiveCommsDown.size(); // number of different nodes sending to dest
140 double penalty = std::max(my_penalty_in, max_penalty_out);
142 double rate_before_update = comm->action->get_bound();
143 // save initial rate of the action
144 if (comm->init_rate == -1)
145 comm->init_rate = rate_before_update;
147 double penalized_bw = num_comm_out ? comm->init_rate / penalty : comm->init_rate;
149 if (not double_equals(penalized_bw, rate_before_update, sg_surf_precision)) {
150 XBT_DEBUG("%d->%d action %p penalty updated : bw now %f, before %f , initial rate %f", root->id,
151 comm->destination->id, comm->action, penalized_bw, comm->action->get_bound(), comm->init_rate);
152 get_maxmin_system()->update_variable_bound(comm->action->get_variable(), penalized_bw);
154 XBT_DEBUG("%d->%d action %p penalty not updated : bw %f, initial rate %f", root->id, comm->destination->id,
155 comm->action, penalized_bw, comm->init_rate);
158 XBT_DEBUG("Finished computing IB penalties");
161 void NetworkIBModel::updateIBfactors_rec(IBNode* root, std::vector<bool>& updatedlist) const
163 if (not updatedlist[root->id]) {
164 XBT_DEBUG("IB - Updating rec %d", root->id);
165 computeIBfactors(root);
166 updatedlist[root->id] = true;
167 for (ActiveComm const* comm : root->ActiveCommsUp) {
168 if (not updatedlist[comm->destination->id])
169 updateIBfactors_rec(comm->destination, updatedlist);
171 for (std::map<IBNode*, int>::value_type const& comm : root->ActiveCommsDown) {
172 if (not updatedlist[comm.first->id])
173 updateIBfactors_rec(comm.first, updatedlist);
178 void NetworkIBModel::updateIBfactors(NetworkAction* action, IBNode* from, IBNode* to, int remove) const
180 if (from == to) // disregard local comms (should use loopback)
184 if (to->ActiveCommsDown[from] == 1)
185 to->ActiveCommsDown.erase(from);
187 to->ActiveCommsDown[from] -= 1;
189 to->nbActiveCommsDown--;
190 auto it = std::find_if(begin(from->ActiveCommsUp), end(from->ActiveCommsUp),
191 [action](const ActiveComm* comm) { return comm->action == action; });
192 if (it != std::end(from->ActiveCommsUp)) {
194 from->ActiveCommsUp.erase(it);
199 auto* comm = new ActiveComm();
200 comm->action = action;
201 comm->destination = to;
202 from->ActiveCommsUp.push_back(comm);
204 to->ActiveCommsDown[from] += 1;
205 to->nbActiveCommsDown++;
207 XBT_DEBUG("IB - Updating %d", from->id);
208 std::vector<bool> updated(active_nodes.size(), false);
209 updateIBfactors_rec(from, updated);
210 XBT_DEBUG("IB - Finished updating %d", from->id);
212 } // namespace resource
213 } // namespace kernel
214 } // namespace simgrid