1 /* Copyright (c) 2013-2019. 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 "network_cm02.hpp"
7 #include "simgrid/s4u/Host.hpp"
8 #include "simgrid/sg_config.hpp"
9 #include "src/kernel/resource/profile/Event.hpp"
10 #include "src/surf/surf_interface.hpp"
11 #include "surf/surf.hpp"
16 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
18 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
19 double sg_bandwidth_factor = 1.0; /* default value; can be set by model or from command line */
20 double sg_weight_S_parameter = 0.0; /* default value; can be set by model or from command line */
22 /************************************************************************/
23 /* New model based on optimizations discussed during Pedro Velho's thesis*/
24 /************************************************************************/
25 /* @techreport{VELHO:2011:HAL-00646896:1, */
26 /* url = {http://hal.inria.fr/hal-00646896/en/}, */
27 /* title = {{Flow-level network models: have we reached the limits?}}, */
28 /* author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
29 /* type = {Rapport de recherche}, */
30 /* institution = {INRIA}, */
31 /* number = {RR-7821}, */
34 /* pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
36 void surf_network_model_init_LegrandVelho()
38 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
40 surf_network_model = new simgrid::kernel::resource::NetworkCm02Model();
42 simgrid::config::set_default<double>("network/latency-factor", 13.01);
43 simgrid::config::set_default<double>("network/bandwidth-factor", 0.97);
44 simgrid::config::set_default<double>("network/weight-S", 20537);
47 /***************************************************************************/
48 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
49 /***************************************************************************/
50 /* @TechReport{ rr-lip2002-40, */
51 /* author = {Henri Casanova and Loris Marchal}, */
52 /* institution = {LIP}, */
53 /* title = {A Network Model for Simulation of Grid Application}, */
54 /* number = {2002-40}, */
58 void surf_network_model_init_CM02()
60 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
62 simgrid::config::set_default<double>("network/latency-factor", 1.0);
63 simgrid::config::set_default<double>("network/bandwidth-factor", 1.0);
64 simgrid::config::set_default<double>("network/weight-S", 0.0);
66 surf_network_model = new simgrid::kernel::resource::NetworkCm02Model();
73 NetworkCm02Model::NetworkCm02Model(kernel::lmm::System* (*make_new_lmm_system)(bool))
74 : NetworkModel(simgrid::config::get_value<std::string>("network/optim") == "Full" ? Model::UpdateAlgo::FULL
75 : Model::UpdateAlgo::LAZY)
77 all_existing_models.push_back(this);
79 std::string optim = simgrid::config::get_value<std::string>("network/optim");
80 bool select = simgrid::config::get_value<bool>("network/maxmin-selective-update");
82 if (optim == "Lazy") {
83 xbt_assert(select || simgrid::config::is_default("network/maxmin-selective-update"),
84 "You cannot disable network selective update when using the lazy update mechanism");
88 set_maxmin_system(make_new_lmm_system(select));
89 loopback_ = NetworkCm02Model::create_link("__loopback__", std::vector<double>(1, 498000000), 0.000015,
90 s4u::Link::SharingPolicy::FATPIPE);
93 LinkImpl* NetworkCm02Model::create_link(const std::string& name, const std::vector<double>& bandwidths, double latency,
94 s4u::Link::SharingPolicy policy)
96 if (policy == s4u::Link::SharingPolicy::WIFI) {
97 return (new NetworkWifiLink(this, name, bandwidths, policy, get_maxmin_system()));
99 xbt_assert(bandwidths.size() == 1, "Non WIFI links must use only 1 bandwidth.");
100 return new NetworkCm02Link(this, name, bandwidths[0], latency, policy, get_maxmin_system());
103 void NetworkCm02Model::update_actions_state_lazy(double now, double /*delta*/)
105 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_surf_precision)) {
107 auto* action = static_cast<NetworkCm02Action*>(get_action_heap().pop());
108 XBT_DEBUG("Something happened to action %p", action);
110 // if I am wearing a latency hat
111 if (action->get_type() == ActionHeap::Type::latency) {
112 XBT_DEBUG("Latency paid for action %p. Activating", action);
113 get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
114 get_action_heap().remove(action);
115 action->set_last_update();
117 // if I am wearing a max_duration or normal hat
118 } else if (action->get_type() == ActionHeap::Type::max_duration || action->get_type() == ActionHeap::Type::normal) {
119 // no need to communicate anymore
120 // assume that flows that reached max_duration have remaining of 0
121 XBT_DEBUG("Action %p finished", action);
122 action->finish(Action::State::FINISHED);
123 get_action_heap().remove(action);
128 void NetworkCm02Model::update_actions_state_full(double /*now*/, double delta)
130 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
131 NetworkCm02Action& action = static_cast<NetworkCm02Action&>(*it);
132 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
133 XBT_DEBUG("Something happened to action %p", &action);
134 double deltap = delta;
135 if (action.latency_ > 0) {
136 if (action.latency_ > deltap) {
137 double_update(&action.latency_, deltap, sg_surf_precision);
140 double_update(&deltap, action.latency_, sg_surf_precision);
141 action.latency_ = 0.0;
143 if (action.latency_ <= 0.0 && not action.is_suspended())
144 get_maxmin_system()->update_variable_penalty(action.get_variable(), action.sharing_penalty_);
147 if (not action.get_variable()->get_number_of_constraint()) {
148 /* There is actually no link used, hence an infinite bandwidth. This happens often when using models like
149 * vivaldi. In such case, just make sure that the action completes immediately.
151 action.update_remains(action.get_remains());
153 action.update_remains(action.get_variable()->get_value() * delta);
155 if (action.get_max_duration() != NO_MAX_DURATION)
156 action.update_max_duration(delta);
158 if (((action.get_remains() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
159 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
160 action.finish(Action::State::FINISHED);
165 Action* NetworkCm02Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
167 double latency = 0.0;
168 std::vector<LinkImpl*> back_route;
169 std::vector<LinkImpl*> route;
171 XBT_IN("(%s,%s,%g,%g)", src->get_cname(), dst->get_cname(), size, rate);
173 src->route_to(dst, route, &latency);
174 xbt_assert(not route.empty() || latency > 0,
175 "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
176 src->get_cname(), dst->get_cname());
178 bool failed = std::any_of(route.begin(), route.end(), [](const LinkImpl* link) { return not link->is_on(); });
180 if (cfg_crosstraffic) {
181 dst->route_to(src, back_route, nullptr);
184 std::any_of(back_route.begin(), back_route.end(), [](const LinkImpl* link) { return not link->is_on(); });
187 auto* action = new NetworkCm02Action(this, size, failed);
188 action->sharing_penalty_ = latency;
189 action->latency_ = latency;
190 action->rate_ = rate;
192 if (get_update_algorithm() == Model::UpdateAlgo::LAZY) {
193 action->set_last_update();
196 if (sg_weight_S_parameter > 0) {
197 action->sharing_penalty_ =
198 std::accumulate(route.begin(), route.end(), action->sharing_penalty_, [](double total, LinkImpl* const& link) {
199 return total + sg_weight_S_parameter / link->get_bandwidth();
203 double bandwidth_bound = route.empty() ? -1.0 : get_bandwidth_factor(size) * route.front()->get_bandwidth();
205 for (auto const& link : route)
206 bandwidth_bound = std::min(bandwidth_bound, get_bandwidth_factor(size) * link->get_bandwidth());
208 action->lat_current_ = action->latency_;
209 action->latency_ *= get_latency_factor(size);
210 action->rate_ = get_bandwidth_constraint(action->rate_, bandwidth_bound, size);
212 size_t constraints_per_variable = route.size();
213 constraints_per_variable += back_route.size();
215 if (action->latency_ > 0) {
216 action->set_variable(get_maxmin_system()->variable_new(action, 0.0, -1.0, constraints_per_variable));
217 if (get_update_algorithm() == Model::UpdateAlgo::LAZY) {
218 // add to the heap the event when the latency is payed
219 double date = action->latency_ + action->get_last_update();
221 ActionHeap::Type type = route.empty() ? ActionHeap::Type::normal : ActionHeap::Type::latency;
223 XBT_DEBUG("Added action (%p) one latency event at date %f", action, date);
224 get_action_heap().insert(action, date, type);
227 action->set_variable(get_maxmin_system()->variable_new(action, 1.0, -1.0, constraints_per_variable));
229 if (action->rate_ < 0) {
230 get_maxmin_system()->update_variable_bound(
231 action->get_variable(), (action->lat_current_ > 0) ? cfg_tcp_gamma / (2.0 * action->lat_current_) : -1.0);
233 get_maxmin_system()->update_variable_bound(
234 action->get_variable(), (action->lat_current_ > 0)
235 ? std::min(action->rate_, cfg_tcp_gamma / (2.0 * action->lat_current_))
239 for (auto const& link : route) {
241 if (link->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
242 NetworkWifiLink* wifi_link = static_cast<NetworkWifiLink*>(link);
244 double src_rate = wifi_link->get_host_rate(src);
245 double dst_rate = wifi_link->get_host_rate(dst);
247 !(src_rate == -1 && dst_rate == -1),
248 "Some Stations are not associated to any Access Point. Make sure to call set_host_rate on all Stations.");
250 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), 1.0 / src_rate);
252 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), 1.0 / dst_rate);
255 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), 1.0);
259 if (cfg_crosstraffic) {
260 XBT_DEBUG("Crosstraffic active: adding backward flow using 5%% of the available bandwidth");
261 bool wifi_dst_assigned = false; // Used by wifi crosstraffic
262 for (auto const& link : back_route) {
263 if (link->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
264 NetworkWifiLink* wifi_link = static_cast<NetworkWifiLink*>(link);
266 * For wifi links we should add 0.05/rate.
267 * However since we are using the "back_route" we should encounter in
268 * the first place the dst wifi link.
270 if (!wifi_dst_assigned && (wifi_link->get_host_rate(dst) != -1)) {
271 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(),
272 .05 / wifi_link->get_host_rate(dst));
273 wifi_dst_assigned = true;
275 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(),
276 .05 / wifi_link->get_host_rate(src));
279 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), .05);
283 // Change concurrency_share here, if you want that cross-traffic is included in the SURF concurrency
284 // (You would also have to change simgrid::kernel::lmm::Element::get_concurrency())
285 // action->getVariable()->set_concurrency_share(2)
289 simgrid::s4u::Link::on_communicate(*action, src, dst);
296 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model* model, const std::string& name, double bandwidth, double latency,
297 s4u::Link::SharingPolicy policy, kernel::lmm::System* system)
298 : LinkImpl(model, name, system->constraint_new(this, sg_bandwidth_factor * bandwidth))
300 bandwidth_.scale = 1.0;
301 bandwidth_.peak = bandwidth;
303 latency_.scale = 1.0;
304 latency_.peak = latency;
306 if (policy == s4u::Link::SharingPolicy::FATPIPE)
307 get_constraint()->unshare();
309 simgrid::s4u::Link::on_creation(this->piface_);
312 void NetworkCm02Link::apply_event(kernel::profile::Event* triggered, double value)
314 /* Find out which of my iterators was triggered, and react accordingly */
315 if (triggered == bandwidth_.event) {
316 set_bandwidth(value);
317 tmgr_trace_event_unref(&bandwidth_.event);
319 } else if (triggered == latency_.event) {
321 tmgr_trace_event_unref(&latency_.event);
323 } else if (triggered == state_event_) {
329 tmgr_trace_event_unref(&state_event_);
331 xbt_die("Unknown event!\n");
334 XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)",
338 void NetworkCm02Link::set_bandwidth(double value)
340 bandwidth_.peak = value;
342 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
343 sg_bandwidth_factor * (bandwidth_.peak * bandwidth_.scale));
345 LinkImpl::on_bandwidth_change();
347 if (sg_weight_S_parameter > 0) {
348 double delta = sg_weight_S_parameter / value - sg_weight_S_parameter / (bandwidth_.peak * bandwidth_.scale);
350 kernel::lmm::Variable* var;
351 const kernel::lmm::Element* elem = nullptr;
352 const kernel::lmm::Element* nextelem = nullptr;
354 while ((var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem))) {
355 auto* action = static_cast<NetworkCm02Action*>(var->get_id());
356 action->sharing_penalty_ += delta;
357 if (not action->is_suspended())
358 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
363 void NetworkCm02Link::set_latency(double value)
365 double delta = value - latency_.peak;
366 kernel::lmm::Variable* var = nullptr;
367 const kernel::lmm::Element* elem = nullptr;
368 const kernel::lmm::Element* nextelem = nullptr;
371 latency_.peak = value;
373 while ((var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem))) {
374 auto* action = static_cast<NetworkCm02Action*>(var->get_id());
375 action->lat_current_ += delta;
376 action->sharing_penalty_ += delta;
377 if (action->rate_ < 0)
378 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), NetworkModel::cfg_tcp_gamma /
379 (2.0 * action->lat_current_));
381 get_model()->get_maxmin_system()->update_variable_bound(
382 action->get_variable(), std::min(action->rate_, NetworkModel::cfg_tcp_gamma / (2.0 * action->lat_current_)));
384 if (action->rate_ < NetworkModel::cfg_tcp_gamma / (2.0 * action->lat_current_)) {
385 XBT_INFO("Flow is limited BYBANDWIDTH");
387 XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f", action->lat_current_);
390 if (not action->is_suspended())
391 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
395 NetworkWifiLink::NetworkWifiLink(NetworkCm02Model* model, const std::string& name, std::vector<double> bandwidths,
396 s4u::Link::SharingPolicy policy, lmm::System* system)
398 model, name, 1 / sg_bandwidth_factor, 0, policy,
399 system) // Since link use bw*sg_bandwidth_factor we should divise in order to as 1 as bound in the lmm system
401 for (auto bandwidth : bandwidths) {
402 bandwidths_.push_back({bandwidth, 1.0, nullptr});
406 void NetworkWifiLink::set_host_rate(s4u::Host* host, int rate_level)
408 auto insert_done = host_rates_.insert(std::make_pair(host->get_name(), rate_level));
409 if (insert_done.second == false)
410 insert_done.first->second = rate_level;
413 double NetworkWifiLink::get_host_rate(sg_host_t host)
415 std::map<xbt::string, int>::iterator host_rates_it;
416 host_rates_it = host_rates_.find(host->get_name());
418 if (host_rates_it == host_rates_.end())
421 int rate_id = host_rates_it->second;
422 xbt_assert(rate_id >= 0 && rate_id < (int)bandwidths_.size(), "Host \"%s\" has an invalid rate \"%d\"",
423 host->get_name().c_str(), rate_id);
425 Metric rate = bandwidths_[rate_id];
426 return rate.peak * rate.scale;
429 s4u::Link::SharingPolicy NetworkWifiLink::get_sharing_policy()
431 return s4u::Link::SharingPolicy::WIFI;
438 void NetworkCm02Action::update_remains_lazy(double now)
440 if (not is_running())
443 double delta = now - get_last_update();
445 if (get_remains_no_update() > 0) {
446 XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, get_remains_no_update(),
448 update_remains(get_last_value() * delta);
450 XBT_DEBUG("Updating action(%p): remains is now %f", this, get_remains_no_update());
453 update_max_duration(delta);
455 if ((get_remains_no_update() <= 0 && (get_variable()->get_penalty() > 0)) ||
456 ((get_max_duration() != NO_MAX_DURATION) && (get_max_duration() <= 0))) {
457 finish(Action::State::FINISHED);
458 get_model()->get_action_heap().remove(this);
462 set_last_value(get_variable()->get_value());
465 } // namespace resource
466 } // namespace kernel
467 } // namespace simgrid