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>();
43 net_model->set_name("Network_LegrandVelho");
44 simgrid::kernel::EngineImpl::get_instance()->add_model(net_model);
45 simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_network_model(net_model);
47 simgrid::config::set_default<double>("network/latency-factor", 13.01);
48 simgrid::config::set_default<double>("network/bandwidth-factor", 0.97);
49 simgrid::config::set_default<double>("network/weight-S", 20537);
52 /***************************************************************************/
53 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
54 /***************************************************************************/
55 /* @TechReport{ rr-lip2002-40, */
56 /* author = {Henri Casanova and Loris Marchal}, */
57 /* institution = {LIP}, */
58 /* title = {A Network Model for Simulation of Grid Application}, */
59 /* number = {2002-40}, */
63 void surf_network_model_init_CM02()
65 simgrid::config::set_default<double>("network/latency-factor", 1.0);
66 simgrid::config::set_default<double>("network/bandwidth-factor", 1.0);
67 simgrid::config::set_default<double>("network/weight-S", 0.0);
69 auto net_model = std::make_shared<simgrid::kernel::resource::NetworkCm02Model>();
70 net_model->set_name("Network_CM02");
71 simgrid::kernel::EngineImpl::get_instance()->add_model(net_model);
72 simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_network_model(net_model);
79 NetworkCm02Model::NetworkCm02Model()
81 if (config::get_value<std::string>("network/optim") == "Lazy")
82 set_update_algorithm(Model::UpdateAlgo::LAZY);
84 std::string optim = config::get_value<std::string>("network/optim");
85 bool select = config::get_value<bool>("network/maxmin-selective-update");
87 if (optim == "Lazy") {
88 xbt_assert(select || config::is_default("network/maxmin-selective-update"),
89 "You cannot disable network selective update when using the lazy update mechanism");
93 set_maxmin_system(new lmm::System(select));
94 loopback_ = NetworkCm02Model::create_link("__loopback__",
95 std::vector<double>{config::get_value<double>("network/loopback-bw")},
96 s4u::Link::SharingPolicy::FATPIPE)
97 ->set_latency(config::get_value<double>("network/loopback-lat"));
101 LinkImpl* NetworkCm02Model::create_link(const std::string& name, const std::vector<double>& bandwidths,
102 s4u::Link::SharingPolicy policy)
105 if (policy == s4u::Link::SharingPolicy::WIFI) {
106 link = new NetworkWifiLink(name, bandwidths, get_maxmin_system());
108 xbt_assert(bandwidths.size() == 1, "Non-WIFI links must use only 1 bandwidth.");
109 link = new NetworkCm02Link(name, bandwidths[0], policy, get_maxmin_system());
112 link->set_model(this);
116 void NetworkCm02Model::update_actions_state_lazy(double now, double /*delta*/)
118 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_surf_precision)) {
119 auto* action = static_cast<NetworkCm02Action*>(get_action_heap().pop());
120 XBT_DEBUG("Something happened to action %p", action);
122 // if I am wearing a latency hat
123 if (action->get_type() == ActionHeap::Type::latency) {
124 XBT_DEBUG("Latency paid for action %p. Activating", action);
125 get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
126 get_action_heap().remove(action);
127 action->set_last_update();
129 // if I am wearing a max_duration or normal hat
130 } else if (action->get_type() == ActionHeap::Type::max_duration || action->get_type() == ActionHeap::Type::normal) {
131 // no need to communicate anymore
132 // assume that flows that reached max_duration have remaining of 0
133 XBT_DEBUG("Action %p finished", action);
134 action->finish(Action::State::FINISHED);
135 get_action_heap().remove(action);
140 void NetworkCm02Model::update_actions_state_full(double /*now*/, double delta)
142 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
143 auto& action = static_cast<NetworkCm02Action&>(*it);
144 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
145 XBT_DEBUG("Something happened to action %p", &action);
146 double deltap = delta;
147 if (action.latency_ > 0) {
148 if (action.latency_ > deltap) {
149 double_update(&action.latency_, deltap, sg_surf_precision);
152 double_update(&deltap, action.latency_, sg_surf_precision);
153 action.latency_ = 0.0;
155 if (action.latency_ <= 0.0 && not action.is_suspended())
156 get_maxmin_system()->update_variable_penalty(action.get_variable(), action.sharing_penalty_);
159 if (not action.get_variable()->get_number_of_constraint()) {
160 /* There is actually no link used, hence an infinite bandwidth. This happens often when using models like
161 * vivaldi. In such case, just make sure that the action completes immediately.
163 action.update_remains(action.get_remains());
165 action.update_remains(action.get_variable()->get_value() * delta);
167 if (action.get_max_duration() != NO_MAX_DURATION)
168 action.update_max_duration(delta);
170 if (((action.get_remains() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
171 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
172 action.finish(Action::State::FINISHED);
177 Action* NetworkCm02Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
179 double latency = 0.0;
180 std::vector<LinkImpl*> back_route;
181 std::vector<LinkImpl*> route;
183 XBT_IN("(%s,%s,%g,%g)", src->get_cname(), dst->get_cname(), size, rate);
185 src->route_to(dst, route, &latency);
186 xbt_assert(not route.empty() || latency > 0,
187 "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
188 src->get_cname(), dst->get_cname());
190 bool failed = std::any_of(route.begin(), route.end(), [](const LinkImpl* link) { return not link->is_on(); });
192 if (cfg_crosstraffic) {
193 dst->route_to(src, back_route, nullptr);
196 std::any_of(back_route.begin(), back_route.end(), [](const LinkImpl* link) { return not link->is_on(); });
199 NetworkWifiLink* src_wifi_link = nullptr;
200 NetworkWifiLink* dst_wifi_link = nullptr;
201 if (not route.empty() && route.front()->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
202 src_wifi_link = static_cast<NetworkWifiLink*>(route.front());
203 xbt_assert(src_wifi_link->get_host_rate(src) != -1,
204 "The route from %s to %s begins with the WIFI link %s, but the host %s does not seem attached to that "
205 "WIFI link. Did you call link->set_host_rate()?",
206 src->get_cname(), dst->get_cname(), src_wifi_link->get_cname(), src->get_cname());
208 if (route.size() > 1 && route.back()->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
209 dst_wifi_link = static_cast<NetworkWifiLink*>(route.back());
210 xbt_assert(dst_wifi_link->get_host_rate(dst) != -1,
211 "The route from %s to %s ends with the WIFI link %s, but the host %s does not seem attached to that "
212 "WIFI link. Did you call link->set_host_rate()?",
213 src->get_cname(), dst->get_cname(), dst_wifi_link->get_cname(), dst->get_cname());
215 if (route.size() > 2)
216 for (unsigned i = 1; i < route.size() - 1; i++)
217 xbt_assert(route[i]->get_sharing_policy() != s4u::Link::SharingPolicy::WIFI,
218 "Link '%s' is a WIFI link. It can only be at the beginning or the end of the route from '%s' to '%s', "
219 "not in between (it is at position %u out of %zu). "
220 "Did you declare an access_point in your WIFI zones?",
221 route[i]->get_cname(), src->get_cname(), dst->get_cname(), i + 1, route.size());
223 NetworkCm02Action* action;
224 if (src_wifi_link == nullptr && dst_wifi_link == nullptr)
225 action = new NetworkCm02Action(this, *src, *dst, size, failed);
227 action = new NetworkWifiAction(this, *src, *dst, size, failed, src_wifi_link, dst_wifi_link);
228 action->sharing_penalty_ = latency;
229 action->latency_ = latency;
230 action->set_user_bound(rate);
232 if (is_update_lazy()) {
233 action->set_last_update();
236 if (sg_weight_S_parameter > 0) {
237 action->sharing_penalty_ =
238 std::accumulate(route.begin(), route.end(), action->sharing_penalty_, [](double total, LinkImpl* const& link) {
239 return total + sg_weight_S_parameter / link->get_bandwidth();
243 double bandwidth_bound = route.empty() ? -1.0 : get_bandwidth_factor(size) * route.front()->get_bandwidth();
245 for (auto const& link : route)
246 bandwidth_bound = std::min(bandwidth_bound, get_bandwidth_factor(size) * link->get_bandwidth());
248 action->lat_current_ = action->latency_;
249 action->latency_ *= get_latency_factor(size);
250 action->set_user_bound(get_bandwidth_constraint(action->get_user_bound(), bandwidth_bound, size));
252 size_t constraints_per_variable = route.size();
253 constraints_per_variable += back_route.size();
255 if (action->latency_ > 0) {
256 action->set_variable(get_maxmin_system()->variable_new(action, 0.0, -1.0, constraints_per_variable));
257 if (is_update_lazy()) {
258 // add to the heap the event when the latency is paid
259 double date = action->latency_ + action->get_last_update();
261 ActionHeap::Type type = route.empty() ? ActionHeap::Type::normal : ActionHeap::Type::latency;
263 XBT_DEBUG("Added action (%p) one latency event at date %f", action, date);
264 get_action_heap().insert(action, date, type);
267 action->set_variable(get_maxmin_system()->variable_new(action, 1.0, -1.0, constraints_per_variable));
269 if (action->get_user_bound() < 0) {
270 get_maxmin_system()->update_variable_bound(
271 action->get_variable(), (action->lat_current_ > 0) ? cfg_tcp_gamma / (2.0 * action->lat_current_) : -1.0);
273 get_maxmin_system()->update_variable_bound(
274 action->get_variable(), (action->lat_current_ > 0)
275 ? std::min(action->get_user_bound(), cfg_tcp_gamma / (2.0 * action->lat_current_))
276 : action->get_user_bound());
279 if (src_wifi_link != nullptr)
280 get_maxmin_system()->expand(src_wifi_link->get_constraint(), action->get_variable(),
281 1.0 / src_wifi_link->get_host_rate(src));
282 if (dst_wifi_link != nullptr)
283 get_maxmin_system()->expand(dst_wifi_link->get_constraint(), action->get_variable(),
284 1.0 / dst_wifi_link->get_host_rate(dst));
286 for (auto const* link : route) {
287 // WIFI links are handled manually just above, so skip them now
288 if (link->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
289 xbt_assert(link == src_wifi_link || link == dst_wifi_link,
290 "Wifi links can only occur at the beginning of the route (meaning that it's attached to the src) or "
291 "at its end (meaning that it's attached to the dst");
293 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), 1.0);
297 if (cfg_crosstraffic) {
298 XBT_DEBUG("Crosstraffic active: adding backward flow using 5%% of the available bandwidth");
299 if (dst_wifi_link != nullptr)
300 get_maxmin_system()->expand(dst_wifi_link->get_constraint(), action->get_variable(),
301 .05 / dst_wifi_link->get_host_rate(dst));
302 if (src_wifi_link != nullptr)
303 get_maxmin_system()->expand(src_wifi_link->get_constraint(), action->get_variable(),
304 .05 / src_wifi_link->get_host_rate(src));
305 for (auto const* link : back_route)
306 if (link->get_sharing_policy() != s4u::Link::SharingPolicy::WIFI)
307 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), .05);
308 // Change concurrency_share here, if you want that cross-traffic is included in the SURF concurrency
309 // (You would also have to change simgrid::kernel::lmm::Element::get_concurrency())
310 // action->getVariable()->set_concurrency_share(2)
314 simgrid::s4u::Link::on_communicate(*action);
321 NetworkCm02Link::NetworkCm02Link(const std::string& name, double bandwidth, s4u::Link::SharingPolicy policy,
322 kernel::lmm::System* system)
325 bandwidth_.scale = 1.0;
326 bandwidth_.peak = bandwidth;
327 this->set_constraint(system->constraint_new(this, sg_bandwidth_factor * bandwidth));
329 if (policy == s4u::Link::SharingPolicy::FATPIPE)
330 get_constraint()->unshare();
333 void NetworkCm02Link::apply_event(kernel::profile::Event* triggered, double value)
335 /* Find out which of my iterators was triggered, and react accordingly */
336 if (triggered == bandwidth_.event) {
337 set_bandwidth(value);
338 tmgr_trace_event_unref(&bandwidth_.event);
340 } else if (triggered == latency_.event) {
342 tmgr_trace_event_unref(&latency_.event);
344 } else if (triggered == state_event_) {
349 tmgr_trace_event_unref(&state_event_);
351 xbt_die("Unknown event!\n");
354 XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)",
358 void NetworkCm02Link::set_bandwidth(double value)
360 bandwidth_.peak = value;
362 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
363 sg_bandwidth_factor * (bandwidth_.peak * bandwidth_.scale));
365 LinkImpl::on_bandwidth_change();
367 if (sg_weight_S_parameter > 0) {
368 double delta = sg_weight_S_parameter / value - sg_weight_S_parameter / (bandwidth_.peak * bandwidth_.scale);
370 const kernel::lmm::Element* elem = nullptr;
371 const kernel::lmm::Element* nextelem = nullptr;
373 while (const auto* var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem)) {
374 auto* action = static_cast<NetworkCm02Action*>(var->get_id());
375 action->sharing_penalty_ += delta;
376 if (not action->is_suspended())
377 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
382 LinkImpl* NetworkCm02Link::set_latency(double value)
384 latency_check(value);
386 double delta = value - latency_.peak;
387 const kernel::lmm::Element* elem = nullptr;
388 const kernel::lmm::Element* nextelem = nullptr;
391 latency_.scale = 1.0;
392 latency_.peak = value;
394 while (const auto* var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem)) {
395 auto* action = static_cast<NetworkCm02Action*>(var->get_id());
396 action->lat_current_ += delta;
397 action->sharing_penalty_ += delta;
398 if (action->get_user_bound() < 0)
399 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), NetworkModel::cfg_tcp_gamma /
400 (2.0 * action->lat_current_));
402 get_model()->get_maxmin_system()->update_variable_bound(
403 action->get_variable(),
404 std::min(action->get_user_bound(), NetworkModel::cfg_tcp_gamma / (2.0 * action->lat_current_)));
406 if (action->get_user_bound() < NetworkModel::cfg_tcp_gamma / (2.0 * action->lat_current_)) {
407 XBT_INFO("Flow is limited BYBANDWIDTH");
409 XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f", action->lat_current_);
412 if (not action->is_suspended())
413 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
422 void NetworkCm02Action::update_remains_lazy(double now)
424 if (not is_running())
427 double delta = now - get_last_update();
429 if (get_remains_no_update() > 0) {
430 XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, get_remains_no_update(),
432 update_remains(get_last_value() * delta);
434 XBT_DEBUG("Updating action(%p): remains is now %f", this, get_remains_no_update());
437 update_max_duration(delta);
439 if ((get_remains_no_update() <= 0 && (get_variable()->get_penalty() > 0)) ||
440 ((get_max_duration() != NO_MAX_DURATION) && (get_max_duration() <= 0))) {
441 finish(Action::State::FINISHED);
442 get_model()->get_action_heap().remove(this);
446 set_last_value(get_variable()->get_value());
449 } // namespace resource
450 } // namespace kernel
451 } // namespace simgrid