1 /* Copyright (c) 2013-2021. 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_cm02.hpp"
7 #include "simgrid/kernel/routing/NetZoneImpl.hpp"
8 #include "simgrid/s4u/Engine.hpp"
9 #include "simgrid/s4u/Host.hpp"
10 #include "simgrid/sg_config.hpp"
11 #include "src/kernel/EngineImpl.hpp"
12 #include "src/kernel/resource/profile/Event.hpp"
13 #include "src/surf/network_wifi.hpp"
14 #include "src/surf/surf_interface.hpp"
15 #include "surf/surf.hpp"
20 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_network);
22 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
23 double sg_bandwidth_factor = 1.0; /* default value; can be set by model or from command line */
24 double sg_weight_S_parameter = 0.0; /* default value; can be set by model or from command line */
26 /************************************************************************/
27 /* New model based on optimizations discussed during Pedro Velho's thesis*/
28 /************************************************************************/
29 /* @techreport{VELHO:2011:HAL-00646896:1, */
30 /* url = {http://hal.inria.fr/hal-00646896/en/}, */
31 /* title = {{Flow-level network models: have we reached the limits?}}, */
32 /* author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
33 /* type = {Rapport de recherche}, */
34 /* institution = {INRIA}, */
35 /* number = {RR-7821}, */
38 /* pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
40 void surf_network_model_init_LegrandVelho()
42 auto net_model = std::make_shared<simgrid::kernel::resource::NetworkCm02Model>("Network_LegrandVelho");
43 simgrid::kernel::EngineImpl::get_instance()->add_model(net_model);
44 simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_network_model(net_model);
46 simgrid::config::set_default<double>("network/latency-factor", 13.01);
47 simgrid::config::set_default<double>("network/bandwidth-factor", 0.97);
48 simgrid::config::set_default<double>("network/weight-S", 20537);
51 /***************************************************************************/
52 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
53 /***************************************************************************/
54 /* @TechReport{ rr-lip2002-40, */
55 /* author = {Henri Casanova and Loris Marchal}, */
56 /* institution = {LIP}, */
57 /* title = {A Network Model for Simulation of Grid Application}, */
58 /* number = {2002-40}, */
62 void surf_network_model_init_CM02()
64 simgrid::config::set_default<double>("network/latency-factor", 1.0);
65 simgrid::config::set_default<double>("network/bandwidth-factor", 1.0);
66 simgrid::config::set_default<double>("network/weight-S", 0.0);
68 auto net_model = std::make_shared<simgrid::kernel::resource::NetworkCm02Model>("Network_CM02");
69 simgrid::kernel::EngineImpl::get_instance()->add_model(net_model);
70 simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_network_model(net_model);
77 NetworkCm02Model::NetworkCm02Model(const std::string& name) : NetworkModel(name)
79 std::string optim = config::get_value<std::string>("network/optim");
80 bool select = config::get_value<bool>("network/maxmin-selective-update");
82 if (optim == "Lazy") {
83 set_update_algorithm(Model::UpdateAlgo::LAZY);
84 xbt_assert(select || config::is_default("network/maxmin-selective-update"),
85 "You cannot disable network selective update when using the lazy update mechanism");
89 set_maxmin_system(new lmm::System(select));
90 loopback_ = NetworkCm02Model::create_link("__loopback__",
91 std::vector<double>{config::get_value<double>("network/loopback-bw")},
92 s4u::Link::SharingPolicy::FATPIPE)
93 ->set_latency(config::get_value<double>("network/loopback-lat"));
97 LinkImpl* NetworkCm02Model::create_link(const std::string& name, const std::vector<double>& bandwidths,
98 s4u::Link::SharingPolicy policy)
101 if (policy == s4u::Link::SharingPolicy::WIFI) {
102 link = new NetworkWifiLink(name, bandwidths, get_maxmin_system());
104 xbt_assert(bandwidths.size() == 1, "Non-WIFI links must use only 1 bandwidth.");
105 link = new NetworkCm02Link(name, bandwidths[0], policy, get_maxmin_system());
108 link->set_model(this);
112 void NetworkCm02Model::update_actions_state_lazy(double now, double /*delta*/)
114 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_surf_precision)) {
115 auto* action = static_cast<NetworkCm02Action*>(get_action_heap().pop());
116 XBT_DEBUG("Something happened to action %p", action);
118 // if I am wearing a latency hat
119 if (action->get_type() == ActionHeap::Type::latency) {
120 XBT_DEBUG("Latency paid for action %p. Activating", action);
121 get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
122 get_action_heap().remove(action);
123 action->set_last_update();
125 // if I am wearing a max_duration or normal hat
126 } else if (action->get_type() == ActionHeap::Type::max_duration || action->get_type() == ActionHeap::Type::normal) {
127 // no need to communicate anymore
128 // assume that flows that reached max_duration have remaining of 0
129 XBT_DEBUG("Action %p finished", action);
130 action->finish(Action::State::FINISHED);
131 get_action_heap().remove(action);
136 void NetworkCm02Model::update_actions_state_full(double /*now*/, double delta)
138 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
139 auto& action = static_cast<NetworkCm02Action&>(*it);
140 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
141 XBT_DEBUG("Something happened to action %p", &action);
142 double deltap = delta;
143 if (action.latency_ > 0) {
144 if (action.latency_ > deltap) {
145 double_update(&action.latency_, deltap, sg_surf_precision);
148 double_update(&deltap, action.latency_, sg_surf_precision);
149 action.latency_ = 0.0;
151 if (action.latency_ <= 0.0 && not action.is_suspended())
152 get_maxmin_system()->update_variable_penalty(action.get_variable(), action.sharing_penalty_);
155 if (not action.get_variable()->get_number_of_constraint()) {
156 /* There is actually no link used, hence an infinite bandwidth. This happens often when using models like
157 * vivaldi. In such case, just make sure that the action completes immediately.
159 action.update_remains(action.get_remains());
161 action.update_remains(action.get_variable()->get_value() * delta);
163 if (action.get_max_duration() != NO_MAX_DURATION)
164 action.update_max_duration(delta);
166 if (((action.get_remains() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
167 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
168 action.finish(Action::State::FINISHED);
173 Action* NetworkCm02Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
175 double latency = 0.0;
176 std::vector<LinkImpl*> back_route;
177 std::vector<LinkImpl*> route;
179 XBT_IN("(%s,%s,%g,%g)", src->get_cname(), dst->get_cname(), size, rate);
181 src->route_to(dst, route, &latency);
182 xbt_assert(not route.empty() || latency > 0,
183 "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
184 src->get_cname(), dst->get_cname());
186 bool failed = std::any_of(route.begin(), route.end(), [](const LinkImpl* link) { return not link->is_on(); });
188 if (cfg_crosstraffic) {
189 dst->route_to(src, back_route, nullptr);
192 std::any_of(back_route.begin(), back_route.end(), [](const LinkImpl* link) { return not link->is_on(); });
195 NetworkWifiLink* src_wifi_link = nullptr;
196 NetworkWifiLink* dst_wifi_link = nullptr;
197 if (not route.empty() && route.front()->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
198 src_wifi_link = static_cast<NetworkWifiLink*>(route.front());
199 xbt_assert(src_wifi_link->get_host_rate(src) != -1,
200 "The route from %s to %s begins with the WIFI link %s, but the host %s does not seem attached to that "
201 "WIFI link. Did you call link->set_host_rate()?",
202 src->get_cname(), dst->get_cname(), src_wifi_link->get_cname(), src->get_cname());
204 if (route.size() > 1 && route.back()->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
205 dst_wifi_link = static_cast<NetworkWifiLink*>(route.back());
206 xbt_assert(dst_wifi_link->get_host_rate(dst) != -1,
207 "The route from %s to %s ends with the WIFI link %s, but the host %s does not seem attached to that "
208 "WIFI link. Did you call link->set_host_rate()?",
209 src->get_cname(), dst->get_cname(), dst_wifi_link->get_cname(), dst->get_cname());
211 if (route.size() > 2)
212 for (unsigned i = 1; i < route.size() - 1; i++)
213 xbt_assert(route[i]->get_sharing_policy() != s4u::Link::SharingPolicy::WIFI,
214 "Link '%s' is a WIFI link. It can only be at the beginning or the end of the route from '%s' to '%s', "
215 "not in between (it is at position %u out of %zu). "
216 "Did you declare an access_point in your WIFI zones?",
217 route[i]->get_cname(), src->get_cname(), dst->get_cname(), i + 1, route.size());
219 NetworkCm02Action* action;
220 if (src_wifi_link == nullptr && dst_wifi_link == nullptr)
221 action = new NetworkCm02Action(this, *src, *dst, size, failed);
223 action = new NetworkWifiAction(this, *src, *dst, size, failed, src_wifi_link, dst_wifi_link);
224 action->sharing_penalty_ = latency;
225 action->latency_ = latency;
226 action->set_user_bound(rate);
228 if (is_update_lazy()) {
229 action->set_last_update();
232 if (sg_weight_S_parameter > 0) {
233 action->sharing_penalty_ =
234 std::accumulate(route.begin(), route.end(), action->sharing_penalty_, [](double total, LinkImpl* const& link) {
235 return total + sg_weight_S_parameter / link->get_bandwidth();
239 double bandwidth_bound = route.empty() ? -1.0 : get_bandwidth_factor(size) * route.front()->get_bandwidth();
241 for (auto const& link : route)
242 bandwidth_bound = std::min(bandwidth_bound, get_bandwidth_factor(size) * link->get_bandwidth());
244 action->lat_current_ = action->latency_;
245 action->latency_ *= get_latency_factor(size);
246 action->set_user_bound(get_bandwidth_constraint(action->get_user_bound(), bandwidth_bound, size));
248 size_t constraints_per_variable = route.size();
249 constraints_per_variable += back_route.size();
251 if (action->latency_ > 0) {
252 action->set_variable(get_maxmin_system()->variable_new(action, 0.0, -1.0, constraints_per_variable));
253 if (is_update_lazy()) {
254 // add to the heap the event when the latency is paid
255 double date = action->latency_ + action->get_last_update();
257 ActionHeap::Type type = route.empty() ? ActionHeap::Type::normal : ActionHeap::Type::latency;
259 XBT_DEBUG("Added action (%p) one latency event at date %f", action, date);
260 get_action_heap().insert(action, date, type);
263 action->set_variable(get_maxmin_system()->variable_new(action, 1.0, -1.0, constraints_per_variable));
265 if (action->get_user_bound() < 0) {
266 get_maxmin_system()->update_variable_bound(
267 action->get_variable(), (action->lat_current_ > 0) ? cfg_tcp_gamma / (2.0 * action->lat_current_) : -1.0);
269 get_maxmin_system()->update_variable_bound(
270 action->get_variable(), (action->lat_current_ > 0)
271 ? std::min(action->get_user_bound(), cfg_tcp_gamma / (2.0 * action->lat_current_))
272 : action->get_user_bound());
275 if (src_wifi_link != nullptr)
276 get_maxmin_system()->expand(src_wifi_link->get_constraint(), action->get_variable(),
277 1.0 / src_wifi_link->get_host_rate(src));
278 if (dst_wifi_link != nullptr)
279 get_maxmin_system()->expand(dst_wifi_link->get_constraint(), action->get_variable(),
280 1.0 / dst_wifi_link->get_host_rate(dst));
282 for (auto const* link : route) {
283 // WIFI links are handled manually just above, so skip them now
284 if (link->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
285 xbt_assert(link == src_wifi_link || link == dst_wifi_link,
286 "Wifi links can only occur at the beginning of the route (meaning that it's attached to the src) or "
287 "at its end (meaning that it's attached to the dst");
289 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), 1.0);
293 if (cfg_crosstraffic) {
294 XBT_DEBUG("Crosstraffic active: adding backward flow using 5%% of the available bandwidth");
295 if (dst_wifi_link != nullptr)
296 get_maxmin_system()->expand(dst_wifi_link->get_constraint(), action->get_variable(),
297 .05 / dst_wifi_link->get_host_rate(dst));
298 if (src_wifi_link != nullptr)
299 get_maxmin_system()->expand(src_wifi_link->get_constraint(), action->get_variable(),
300 .05 / src_wifi_link->get_host_rate(src));
301 for (auto const* link : back_route)
302 if (link->get_sharing_policy() != s4u::Link::SharingPolicy::WIFI)
303 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), .05);
304 // Change concurrency_share here, if you want that cross-traffic is included in the SURF concurrency
305 // (You would also have to change simgrid::kernel::lmm::Element::get_concurrency())
306 // action->getVariable()->set_concurrency_share(2)
310 simgrid::s4u::Link::on_communicate(*action);
317 NetworkCm02Link::NetworkCm02Link(const std::string& name, double bandwidth, s4u::Link::SharingPolicy policy,
318 kernel::lmm::System* system)
321 bandwidth_.scale = 1.0;
322 bandwidth_.peak = bandwidth;
323 this->set_constraint(system->constraint_new(this, sg_bandwidth_factor * bandwidth));
325 if (policy == s4u::Link::SharingPolicy::FATPIPE)
326 get_constraint()->unshare();
329 void NetworkCm02Link::apply_event(kernel::profile::Event* triggered, double value)
331 /* Find out which of my iterators was triggered, and react accordingly */
332 if (triggered == bandwidth_.event) {
333 set_bandwidth(value);
334 tmgr_trace_event_unref(&bandwidth_.event);
336 } else if (triggered == latency_.event) {
338 tmgr_trace_event_unref(&latency_.event);
340 } else if (triggered == state_event_) {
345 tmgr_trace_event_unref(&state_event_);
347 xbt_die("Unknown event!\n");
350 XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)",
354 void NetworkCm02Link::set_bandwidth(double value)
356 bandwidth_.peak = value;
358 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
359 sg_bandwidth_factor * (bandwidth_.peak * bandwidth_.scale));
361 LinkImpl::on_bandwidth_change();
363 if (sg_weight_S_parameter > 0) {
364 double delta = sg_weight_S_parameter / value - sg_weight_S_parameter / (bandwidth_.peak * bandwidth_.scale);
366 const kernel::lmm::Element* elem = nullptr;
367 const kernel::lmm::Element* nextelem = nullptr;
369 while (const auto* var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem)) {
370 auto* action = static_cast<NetworkCm02Action*>(var->get_id());
371 action->sharing_penalty_ += delta;
372 if (not action->is_suspended())
373 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
378 LinkImpl* NetworkCm02Link::set_latency(double value)
380 latency_check(value);
382 double delta = value - latency_.peak;
383 const kernel::lmm::Element* elem = nullptr;
384 const kernel::lmm::Element* nextelem = nullptr;
387 latency_.scale = 1.0;
388 latency_.peak = value;
390 while (const auto* var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem)) {
391 auto* action = static_cast<NetworkCm02Action*>(var->get_id());
392 action->lat_current_ += delta;
393 action->sharing_penalty_ += delta;
394 if (action->get_user_bound() < 0)
395 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), NetworkModel::cfg_tcp_gamma /
396 (2.0 * action->lat_current_));
398 get_model()->get_maxmin_system()->update_variable_bound(
399 action->get_variable(),
400 std::min(action->get_user_bound(), NetworkModel::cfg_tcp_gamma / (2.0 * action->lat_current_)));
402 if (action->get_user_bound() < NetworkModel::cfg_tcp_gamma / (2.0 * action->lat_current_)) {
403 XBT_INFO("Flow is limited BYBANDWIDTH");
405 XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f", action->lat_current_);
408 if (not action->is_suspended())
409 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
418 void NetworkCm02Action::update_remains_lazy(double now)
420 if (not is_running())
423 double delta = now - get_last_update();
425 if (get_remains_no_update() > 0) {
426 XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, get_remains_no_update(),
428 update_remains(get_last_value() * delta);
430 XBT_DEBUG("Updating action(%p): remains is now %f", this, get_remains_no_update());
433 update_max_duration(delta);
435 if ((get_remains_no_update() <= 0 && (get_variable()->get_penalty() > 0)) ||
436 ((get_max_duration() != NO_MAX_DURATION) && (get_max_duration() <= 0))) {
437 finish(Action::State::FINISHED);
438 get_model()->get_action_heap().remove(this);
442 set_last_value(get_variable()->get_value());
445 } // namespace resource
446 } // namespace kernel
447 } // namespace simgrid