1 /* Copyright (c) 2014-2020. 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, const simgrid::s4u::Host* src,
45 const simgrid::s4u::Host* dst)
47 simgrid::kernel::resource::NetworkIBModel* ibModel = (simgrid::kernel::resource::NetworkIBModel*)surf_network_model;
48 simgrid::kernel::resource::IBNode* act_src = &ibModel->active_nodes.at(src->get_name());
49 simgrid::kernel::resource::IBNode* act_dst = &ibModel->active_nodes.at(dst->get_name());
51 ibModel->active_comms[&action] = std::make_pair(act_src, act_dst);
52 ibModel->updateIBfactors(&action, act_src, act_dst, 0);
59 /************************************************************************/
60 /* New model based on MPI contention model for Infiniband platforms */
61 /************************************************************************/
62 /* @Inproceedings{mescal_vienne_phd, */
63 /* author={Jérôme Vienne}, */
64 /* title={prédiction de performances d’applications de calcul haute performance sur réseau Infiniband}, */
65 /* address={Grenoble FRANCE}, */
69 void surf_network_model_init_IB()
71 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
73 surf_network_model = new simgrid::kernel::resource::NetworkIBModel();
74 simgrid::s4u::Link::on_communication_state_change.connect(IB_action_state_changed_callback);
75 simgrid::s4u::Link::on_communicate.connect(IB_action_init_callback);
76 simgrid::s4u::Host::on_creation.connect(IB_create_host_callback);
77 simgrid::config::set_default<double>("network/weight-S", 8775);
84 NetworkIBModel::NetworkIBModel() : NetworkSmpiModel()
86 /* Do not add this into all_existing_models: our ancestor already does so */
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)
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)
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)
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 std::vector<ActiveComm*>::iterator it =
191 std::find_if(begin(from->ActiveCommsUp), end(from->ActiveCommsUp),
192 [action](const ActiveComm* comm) { return comm->action == action; });
193 if (it != std::end(from->ActiveCommsUp)) {
195 from->ActiveCommsUp.erase(it);
200 ActiveComm* comm = new ActiveComm();
201 comm->action = action;
202 comm->destination = to;
203 from->ActiveCommsUp.push_back(comm);
205 to->ActiveCommsDown[from] += 1;
206 to->nbActiveCommsDown++;
208 XBT_DEBUG("IB - Updating %d", from->id);
209 std::vector<bool> updated(active_nodes.size(), false);
210 updateIBfactors_rec(from, updated);
211 XBT_DEBUG("IB - Finished updating %d", from->id);
213 } // namespace resource
214 } // namespace kernel
215 } // namespace simgrid