1 /* Copyright (c) 2013-2018. 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. */
9 #include "network_cm02.hpp"
10 #include "simgrid/s4u/Host.hpp"
11 #include "simgrid/sg_config.hpp"
12 #include "src/surf/surf_interface.hpp"
13 #include "surf/surf.hpp"
15 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
17 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
18 double sg_bandwidth_factor = 1.0; /* default value; can be set by model or from command line */
19 double sg_weight_S_parameter = 0.0; /* default value; can be set by model or from command line */
21 /************************************************************************/
22 /* New model based on optimizations discussed during Pedro Velho's thesis*/
23 /************************************************************************/
24 /* @techreport{VELHO:2011:HAL-00646896:1, */
25 /* url = {http://hal.inria.fr/hal-00646896/en/}, */
26 /* title = {{Flow-level network models: have we reached the limits?}}, */
27 /* author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
28 /* type = {Rapport de recherche}, */
29 /* institution = {INRIA}, */
30 /* number = {RR-7821}, */
33 /* pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
35 void surf_network_model_init_LegrandVelho()
37 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
39 surf_network_model = new simgrid::kernel::resource::NetworkCm02Model();
41 simgrid::config::set_default<double>("network/latency-factor", 13.01);
42 simgrid::config::set_default<double>("network/bandwidth-factor", 0.97);
43 simgrid::config::set_default<double>("network/weight-S", 20537);
46 /***************************************************************************/
47 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
48 /***************************************************************************/
49 /* @TechReport{ rr-lip2002-40, */
50 /* author = {Henri Casanova and Loris Marchal}, */
51 /* institution = {LIP}, */
52 /* title = {A Network Model for Simulation of Grid Application}, */
53 /* number = {2002-40}, */
57 void surf_network_model_init_CM02()
59 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
61 simgrid::config::set_default<double>("network/latency-factor", 1.0);
62 simgrid::config::set_default<double>("network/bandwidth-factor", 1.0);
63 simgrid::config::set_default<double>("network/weight-S", 0.0);
65 surf_network_model = new simgrid::kernel::resource::NetworkCm02Model();
68 /***************************************************************************/
69 /* The models from Steven H. Low */
70 /***************************************************************************/
72 /* author={Steven H. Low}, */
73 /* title={A Duality Model of {TCP} and Queue Management Algorithms}, */
75 /* journal={{IEEE/ACM} Transactions on Networking}, */
76 /* volume={11}, number={4}, */
78 void surf_network_model_init_Reno()
80 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
82 namespace lmm = simgrid::kernel::lmm;
83 lmm::Lagrange::set_default_protocol_function(lmm::func_reno_f, lmm::func_reno_fp, lmm::func_reno_fpi);
85 simgrid::config::set_default<double>("network/latency-factor", 13.01);
86 simgrid::config::set_default<double>("network/bandwidth-factor", 0.97);
87 simgrid::config::set_default<double>("network/weight-S", 20537);
89 surf_network_model = new simgrid::kernel::resource::NetworkCm02Model(&simgrid::kernel::lmm::make_new_lagrange_system);
93 void surf_network_model_init_Reno2()
95 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
97 namespace lmm = simgrid::kernel::lmm;
98 lmm::Lagrange::set_default_protocol_function(lmm::func_reno2_f, lmm::func_reno2_fp, lmm::func_reno2_fpi);
100 simgrid::config::set_default<double>("network/latency-factor", 13.01);
101 simgrid::config::set_default<double>("network/bandwidth-factor", 0.97);
102 simgrid::config::set_default<double>("network/weight-S", 20537);
104 surf_network_model = new simgrid::kernel::resource::NetworkCm02Model(&simgrid::kernel::lmm::make_new_lagrange_system);
107 void surf_network_model_init_Vegas()
109 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
111 namespace lmm = simgrid::kernel::lmm;
112 lmm::Lagrange::set_default_protocol_function(lmm::func_vegas_f, lmm::func_vegas_fp, lmm::func_vegas_fpi);
114 simgrid::config::set_default<double>("network/latency-factor", 13.01);
115 simgrid::config::set_default<double>("network/bandwidth-factor", 0.97);
116 simgrid::config::set_default<double>("network/weight-S", 20537);
118 surf_network_model = new simgrid::kernel::resource::NetworkCm02Model(&simgrid::kernel::lmm::make_new_lagrange_system);
125 NetworkCm02Model::NetworkCm02Model(kernel::lmm::System* (*make_new_lmm_system)(bool))
126 : NetworkModel(simgrid::config::get_value<std::string>("network/optim") == "Full" ? Model::UpdateAlgo::FULL
127 : Model::UpdateAlgo::LAZY)
129 all_existing_models.push_back(this);
131 std::string optim = simgrid::config::get_value<std::string>("network/optim");
132 bool select = simgrid::config::get_value<bool>("network/maxmin-selective-update");
134 if (optim == "Lazy") {
135 xbt_assert(select || simgrid::config::is_default("network/maxmin-selective-update"),
136 "You cannot disable network selective update when using the lazy update mechanism");
140 set_maxmin_system(make_new_lmm_system(select));
141 loopback_ = NetworkCm02Model::create_link("__loopback__", 498000000, 0.000015, s4u::Link::SharingPolicy::FATPIPE);
144 LinkImpl* NetworkCm02Model::create_link(const std::string& name, double bandwidth, double latency,
145 s4u::Link::SharingPolicy policy)
147 return new NetworkCm02Link(this, name, bandwidth, latency, policy, get_maxmin_system());
150 void NetworkCm02Model::update_actions_state_lazy(double now, double /*delta*/)
152 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_surf_precision)) {
154 NetworkCm02Action* action = static_cast<NetworkCm02Action*>(get_action_heap().pop());
155 XBT_DEBUG("Something happened to action %p", action);
157 // if I am wearing a latency hat
158 if (action->get_type() == ActionHeap::Type::latency) {
159 XBT_DEBUG("Latency paid for action %p. Activating", action);
160 get_maxmin_system()->update_variable_weight(action->get_variable(), action->weight_);
161 get_action_heap().remove(action);
162 action->set_last_update();
164 // if I am wearing a max_duration or normal hat
165 } else if (action->get_type() == ActionHeap::Type::max_duration || action->get_type() == ActionHeap::Type::normal) {
166 // no need to communicate anymore
167 // assume that flows that reached max_duration have remaining of 0
168 XBT_DEBUG("Action %p finished", action);
169 action->finish(Action::State::FINISHED);
170 get_action_heap().remove(action);
175 void NetworkCm02Model::update_actions_state_full(double now, double delta)
177 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
178 NetworkCm02Action& action = static_cast<NetworkCm02Action&>(*it);
179 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
180 XBT_DEBUG("Something happened to action %p", &action);
181 double deltap = delta;
182 if (action.latency_ > 0) {
183 if (action.latency_ > deltap) {
184 double_update(&action.latency_, deltap, sg_surf_precision);
187 double_update(&deltap, action.latency_, sg_surf_precision);
188 action.latency_ = 0.0;
190 if (action.latency_ <= 0.0 && not action.is_suspended())
191 get_maxmin_system()->update_variable_weight(action.get_variable(), action.weight_);
194 if (not action.get_variable()->get_number_of_constraint()) {
195 /* There is actually no link used, hence an infinite bandwidth. This happens often when using models like
196 * vivaldi. In such case, just make sure that the action completes immediately.
198 action.update_remains(action.get_remains());
200 action.update_remains(action.get_variable()->get_value() * delta);
202 if (action.get_max_duration() > NO_MAX_DURATION)
203 action.update_max_duration(delta);
205 if (((action.get_remains() <= 0) && (action.get_variable()->get_weight() > 0)) ||
206 ((action.get_max_duration() > NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
207 action.finish(Action::State::FINISHED);
212 Action* NetworkCm02Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
214 double latency = 0.0;
215 std::vector<LinkImpl*> back_route;
216 std::vector<LinkImpl*> route;
218 XBT_IN("(%s,%s,%g,%g)", src->get_cname(), dst->get_cname(), size, rate);
220 src->route_to(dst, route, &latency);
221 xbt_assert(not route.empty() || latency,
222 "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
223 src->get_cname(), dst->get_cname());
225 bool failed = std::any_of(route.begin(), route.end(), [](LinkImpl* link) { return link->is_off(); });
227 if (cfg_crosstraffic) {
228 dst->route_to(src, back_route, nullptr);
230 failed = std::any_of(back_route.begin(), back_route.end(), [](LinkImpl* const& link) { return link->is_off(); });
233 NetworkCm02Action *action = new NetworkCm02Action(this, size, failed);
234 action->weight_ = latency;
235 action->latency_ = latency;
236 action->rate_ = rate;
237 if (get_update_algorithm() == Model::UpdateAlgo::LAZY) {
238 action->set_last_update();
241 if (sg_weight_S_parameter > 0) {
243 std::accumulate(route.begin(), route.end(), action->weight_, [](double total, LinkImpl* const& link) {
244 return total + sg_weight_S_parameter / link->get_bandwidth();
248 double bandwidth_bound = route.empty() ? -1.0 : get_bandwidth_factor(size) * route.front()->get_bandwidth();
250 for (auto const& link : route)
251 bandwidth_bound = std::min(bandwidth_bound, get_bandwidth_factor(size) * link->get_bandwidth());
253 action->lat_current_ = action->latency_;
254 action->latency_ *= get_latency_factor(size);
255 action->rate_ = get_bandwidth_constraint(action->rate_, bandwidth_bound, size);
257 int constraints_per_variable = route.size();
258 constraints_per_variable += back_route.size();
260 if (action->latency_ > 0) {
261 action->set_variable(get_maxmin_system()->variable_new(action, 0.0, -1.0, constraints_per_variable));
262 if (get_update_algorithm() == Model::UpdateAlgo::LAZY) {
263 // add to the heap the event when the latency is payed
264 double date = action->latency_ + action->get_last_update();
266 ActionHeap::Type type = route.empty() ? ActionHeap::Type::normal : ActionHeap::Type::latency;
268 XBT_DEBUG("Added action (%p) one latency event at date %f", action, date);
269 get_action_heap().insert(action, date, type);
272 action->set_variable(get_maxmin_system()->variable_new(action, 1.0, -1.0, constraints_per_variable));
274 if (action->rate_ < 0) {
275 get_maxmin_system()->update_variable_bound(
276 action->get_variable(), (action->lat_current_ > 0) ? cfg_tcp_gamma / (2.0 * action->lat_current_) : -1.0);
278 get_maxmin_system()->update_variable_bound(
279 action->get_variable(), (action->lat_current_ > 0)
280 ? std::min(action->rate_, cfg_tcp_gamma / (2.0 * action->lat_current_))
284 for (auto const& link : route)
285 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), 1.0);
287 if (cfg_crosstraffic) {
288 XBT_DEBUG("Crosstraffic active: adding backward flow using 5%% of the available bandwidth");
289 for (auto const& link : back_route)
290 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), .05);
292 // Change concurrency_share here, if you want that cross-traffic is included in the SURF concurrency
293 // (You would also have to change simgrid::kernel::lmm::Element::get_concurrency())
294 // action->getVariable()->set_concurrency_share(2)
298 simgrid::s4u::Link::on_communicate(action, src, dst);
305 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model* model, const std::string& name, double bandwidth, double latency,
306 s4u::Link::SharingPolicy policy, kernel::lmm::System* system)
307 : LinkImpl(model, name, system->constraint_new(this, sg_bandwidth_factor * bandwidth))
309 bandwidth_.scale = 1.0;
310 bandwidth_.peak = bandwidth;
312 latency_.scale = 1.0;
313 latency_.peak = latency;
315 if (policy == s4u::Link::SharingPolicy::FATPIPE)
316 get_constraint()->unshare();
318 simgrid::s4u::Link::on_creation(this->piface_);
321 void NetworkCm02Link::apply_event(tmgr_trace_event_t triggered, double value)
323 /* Find out which of my iterators was triggered, and react accordingly */
324 if (triggered == bandwidth_.event) {
325 set_bandwidth(value);
326 tmgr_trace_event_unref(&bandwidth_.event);
328 } else if (triggered == latency_.event) {
330 tmgr_trace_event_unref(&latency_.event);
332 } else if (triggered == state_event_) {
336 kernel::lmm::Variable* var = nullptr;
337 const kernel::lmm::Element* elem = nullptr;
338 double now = surf_get_clock();
341 while ((var = get_constraint()->get_variable(&elem))) {
342 Action* action = static_cast<Action*>(var->get_id());
344 if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED) {
345 action->set_finish_time(now);
346 action->set_state(Action::State::FAILED);
350 tmgr_trace_event_unref(&state_event_);
352 xbt_die("Unknown event!\n");
355 XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)",
359 void NetworkCm02Link::set_bandwidth(double value)
361 bandwidth_.peak = value;
363 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
364 sg_bandwidth_factor * (bandwidth_.peak * bandwidth_.scale));
366 LinkImpl::on_bandwidth_change();
368 if (sg_weight_S_parameter > 0) {
369 double delta = sg_weight_S_parameter / value - sg_weight_S_parameter / (bandwidth_.peak * bandwidth_.scale);
371 kernel::lmm::Variable* var;
372 const kernel::lmm::Element* elem = nullptr;
373 const kernel::lmm::Element* nextelem = nullptr;
375 while ((var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem))) {
376 NetworkCm02Action* action = static_cast<NetworkCm02Action*>(var->get_id());
377 action->weight_ += delta;
378 if (not action->is_suspended())
379 get_model()->get_maxmin_system()->update_variable_weight(action->get_variable(), action->weight_);
384 void NetworkCm02Link::set_latency(double value)
386 double delta = value - latency_.peak;
387 kernel::lmm::Variable* var = nullptr;
388 const kernel::lmm::Element* elem = nullptr;
389 const kernel::lmm::Element* nextelem = nullptr;
392 latency_.peak = value;
394 while ((var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem))) {
395 NetworkCm02Action* action = static_cast<NetworkCm02Action*>(var->get_id());
396 action->lat_current_ += delta;
397 action->weight_ += delta;
398 if (action->rate_ < 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(), std::min(action->rate_, NetworkModel::cfg_tcp_gamma / (2.0 * action->lat_current_)));
405 if (action->rate_ < NetworkModel::cfg_tcp_gamma / (2.0 * action->lat_current_)) {
406 XBT_INFO("Flow is limited BYBANDWIDTH");
408 XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f", action->lat_current_);
411 if (not action->is_suspended())
412 get_model()->get_maxmin_system()->update_variable_weight(action->get_variable(), action->weight_);
420 void NetworkCm02Action::update_remains_lazy(double now)
422 if (suspended_ != Action::SuspendStates::not_suspended)
425 double delta = now - get_last_update();
426 double max_duration = get_max_duration();
428 if (get_remains_no_update() > 0) {
429 XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, get_remains_no_update(),
431 update_remains(get_last_value() * delta);
433 XBT_DEBUG("Updating action(%p): remains is now %f", this, get_remains_no_update());
436 if (max_duration > NO_MAX_DURATION) {
437 double_update(&max_duration, delta, sg_surf_precision);
438 set_max_duration(max_duration);
441 if ((get_remains_no_update() <= 0 && (get_variable()->get_weight() > 0)) ||
442 ((max_duration > NO_MAX_DURATION) && (max_duration <= 0))) {
443 finish(Action::State::FINISHED);
444 get_model()->get_action_heap().remove(this);
448 set_last_value(get_variable()->get_value());
453 } // namespace simgrid