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/sg_config.hpp"
8 #include "src/surf/HostImpl.hpp"
9 #include "src/surf/xml/platf.hpp"
10 #include "surf/surf.hpp"
12 #include <boost/algorithm/string/classification.hpp>
13 #include <boost/algorithm/string/split.hpp>
15 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
17 static void IB_create_host_callback(simgrid::s4u::Host const& host)
19 using simgrid::kernel::resource::IBNode;
20 using simgrid::kernel::resource::NetworkIBModel;
24 ((NetworkIBModel*)surf_network_model)->active_nodes.emplace(host.get_name(), IBNode(id));
28 static void IB_action_state_changed_callback(simgrid::kernel::resource::NetworkAction& action,
29 simgrid::kernel::resource::Action::State /*previous*/)
31 using simgrid::kernel::resource::IBNode;
32 using simgrid::kernel::resource::NetworkIBModel;
34 if (action.get_state() != simgrid::kernel::resource::Action::State::FINISHED)
36 std::pair<IBNode*, IBNode*> pair = ((NetworkIBModel*)surf_network_model)->active_comms[&action];
37 XBT_DEBUG("IB callback - action %p finished", &action);
39 ((NetworkIBModel*)surf_network_model)->updateIBfactors(&action, pair.first, pair.second, 1);
41 ((NetworkIBModel*)surf_network_model)->active_comms.erase(&action);
44 static void IB_action_init_callback(simgrid::kernel::resource::NetworkAction& action)
46 auto* ibModel = static_cast<simgrid::kernel::resource::NetworkIBModel*>(surf_network_model);
47 auto* act_src = &ibModel->active_nodes.at(action.get_src().get_name());
48 auto* act_dst = &ibModel->active_nodes.at(action.get_dst().get_name());
50 ibModel->active_comms[&action] = std::make_pair(act_src, act_dst);
51 ibModel->updateIBfactors(&action, act_src, act_dst, 0);
58 /************************************************************************/
59 /* New model based on MPI contention model for Infiniband platforms */
60 /************************************************************************/
61 /* @Inproceedings{mescal_vienne_phd, */
62 /* author={Jérôme Vienne}, */
63 /* title={prédiction de performances d’applications de calcul haute performance sur réseau Infiniband}, */
64 /* address={Grenoble FRANCE}, */
68 void surf_network_model_init_IB()
70 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
72 surf_network_model = new simgrid::kernel::resource::NetworkIBModel();
73 simgrid::s4u::Link::on_communication_state_change.connect(IB_action_state_changed_callback);
74 simgrid::s4u::Link::on_communicate.connect(IB_action_init_callback);
75 simgrid::s4u::Host::on_creation.connect(IB_create_host_callback);
76 simgrid::config::set_default<double>("network/weight-S", 8775);
83 NetworkIBModel::NetworkIBModel() : NetworkSmpiModel()
85 /* Do not add this into all_existing_models: our ancestor already does so */
87 std::string IB_factors_string = config::get_value<std::string>("smpi/IB-penalty-factors");
88 std::vector<std::string> radical_elements;
89 boost::split(radical_elements, IB_factors_string, boost::is_any_of(";"));
91 surf_parse_assert(radical_elements.size() == 3, "smpi/IB-penalty-factors should be provided and contain 3 "
92 "elements, semi-colon separated. Example: 0.965;0.925;1.35");
95 Be = std::stod(radical_elements.front());
96 } catch (const std::invalid_argument& ia) {
97 throw std::invalid_argument(std::string("First part of smpi/IB-penalty-factors is not numerical:") + ia.what());
101 Bs = std::stod(radical_elements.at(1));
102 } catch (const std::invalid_argument& ia) {
103 throw std::invalid_argument(std::string("Second part of smpi/IB-penalty-factors is not numerical:") + ia.what());
107 ys = std::stod(radical_elements.back());
108 } catch (const std::invalid_argument& ia) {
109 throw std::invalid_argument(std::string("Third part of smpi/IB-penalty-factors is not numerical:") + ia.what());
113 void NetworkIBModel::computeIBfactors(IBNode* root) const
115 double num_comm_out = root->ActiveCommsUp.size();
116 double max_penalty_out = 0.0;
117 // first, compute all outbound penalties to get their max
118 for (ActiveComm const* comm : root->ActiveCommsUp) {
119 double my_penalty_out = 1.0;
121 if (num_comm_out != 1) {
122 if (comm->destination->nbActiveCommsDown > 2) // number of comms sent to the receiving node
123 my_penalty_out = num_comm_out * Bs * ys;
125 my_penalty_out = num_comm_out * Bs;
128 max_penalty_out = std::max(max_penalty_out, my_penalty_out);
131 for (ActiveComm* comm : root->ActiveCommsUp) {
132 // compute inbound penalty
133 double my_penalty_in = 1.0;
134 int nb_comms = comm->destination->nbActiveCommsDown; // total number of incoming comms
136 my_penalty_in = (comm->destination->ActiveCommsDown)[root] // number of comm sent to dest by root node
137 * Be * comm->destination->ActiveCommsDown.size(); // number of different nodes sending to dest
139 double penalty = std::max(my_penalty_in, max_penalty_out);
141 double rate_before_update = comm->action->get_bound();
142 // save initial rate of the action
143 if (comm->init_rate == -1)
144 comm->init_rate = rate_before_update;
146 double penalized_bw = num_comm_out ? comm->init_rate / penalty : comm->init_rate;
148 if (not double_equals(penalized_bw, rate_before_update, sg_surf_precision)) {
149 XBT_DEBUG("%d->%d action %p penalty updated : bw now %f, before %f , initial rate %f", root->id,
150 comm->destination->id, comm->action, penalized_bw, comm->action->get_bound(), comm->init_rate);
151 get_maxmin_system()->update_variable_bound(comm->action->get_variable(), penalized_bw);
153 XBT_DEBUG("%d->%d action %p penalty not updated : bw %f, initial rate %f", root->id, comm->destination->id,
154 comm->action, penalized_bw, comm->init_rate);
157 XBT_DEBUG("Finished computing IB penalties");
160 void NetworkIBModel::updateIBfactors_rec(IBNode* root, std::vector<bool>& updatedlist) const
162 if (not updatedlist[root->id]) {
163 XBT_DEBUG("IB - Updating rec %d", root->id);
164 computeIBfactors(root);
165 updatedlist[root->id] = true;
166 for (ActiveComm const* comm : root->ActiveCommsUp) {
167 if (not updatedlist[comm->destination->id])
168 updateIBfactors_rec(comm->destination, updatedlist);
170 for (std::map<IBNode*, int>::value_type const& comm : root->ActiveCommsDown) {
171 if (not updatedlist[comm.first->id])
172 updateIBfactors_rec(comm.first, updatedlist);
177 void NetworkIBModel::updateIBfactors(NetworkAction* action, IBNode* from, IBNode* to, int remove) const
179 if (from == to) // disregard local comms (should use loopback)
183 if (to->ActiveCommsDown[from] == 1)
184 to->ActiveCommsDown.erase(from);
186 to->ActiveCommsDown[from] -= 1;
188 to->nbActiveCommsDown--;
189 auto it = std::find_if(begin(from->ActiveCommsUp), end(from->ActiveCommsUp),
190 [action](const ActiveComm* comm) { return comm->action == action; });
191 if (it != std::end(from->ActiveCommsUp)) {
193 from->ActiveCommsUp.erase(it);
198 auto* comm = new ActiveComm();
199 comm->action = action;
200 comm->destination = to;
201 from->ActiveCommsUp.push_back(comm);
203 to->ActiveCommsDown[from] += 1;
204 to->nbActiveCommsDown++;
206 XBT_DEBUG("IB - Updating %d", from->id);
207 std::vector<bool> updated(active_nodes.size(), false);
208 updateIBfactors_rec(from, updated);
209 XBT_DEBUG("IB - Finished updating %d", from->id);
211 } // namespace resource
212 } // namespace kernel
213 } // namespace simgrid