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/s4u/Host.hpp"
8 #include "simgrid/sg_config.hpp"
9 #include "src/kernel/resource/profile/Event.hpp"
10 #include "src/surf/network_wifi.hpp"
11 #include "src/surf/surf_interface.hpp"
12 #include "surf/surf.hpp"
17 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_network);
19 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
20 double sg_bandwidth_factor = 1.0; /* default value; can be set by model or from command line */
21 double sg_weight_S_parameter = 0.0; /* default value; can be set by model or from command line */
23 /************************************************************************/
24 /* New model based on optimizations discussed during Pedro Velho's thesis*/
25 /************************************************************************/
26 /* @techreport{VELHO:2011:HAL-00646896:1, */
27 /* url = {http://hal.inria.fr/hal-00646896/en/}, */
28 /* title = {{Flow-level network models: have we reached the limits?}}, */
29 /* author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
30 /* type = {Rapport de recherche}, */
31 /* institution = {INRIA}, */
32 /* number = {RR-7821}, */
35 /* pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
37 void surf_network_model_init_LegrandVelho()
39 /* FIXME[donassolo]: this smells bad, but works
40 * (the constructor saves its pointer in all_existing_models and models_by_type :O).
41 * We need a manager for these models */
42 new simgrid::kernel::resource::NetworkCm02Model();
44 simgrid::config::set_default<double>("network/latency-factor", 13.01);
45 simgrid::config::set_default<double>("network/bandwidth-factor", 0.97);
46 simgrid::config::set_default<double>("network/weight-S", 20537);
49 /***************************************************************************/
50 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
51 /***************************************************************************/
52 /* @TechReport{ rr-lip2002-40, */
53 /* author = {Henri Casanova and Loris Marchal}, */
54 /* institution = {LIP}, */
55 /* title = {A Network Model for Simulation of Grid Application}, */
56 /* number = {2002-40}, */
60 void surf_network_model_init_CM02()
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 /* FIXME[donassolo]: this smells bad, but works
67 * (the constructor saves its pointer in all_existing_models and models_by_type :O).
68 * We need a manager for these models */
69 new simgrid::kernel::resource::NetworkCm02Model();
76 NetworkCm02Model::NetworkCm02Model()
77 : NetworkModel(config::get_value<std::string>("network/optim") == "Full" ? Model::UpdateAlgo::FULL
78 : Model::UpdateAlgo::LAZY)
80 all_existing_models.push_back(this);
81 models_by_type[simgrid::kernel::resource::Model::Type::NETWORK].push_back(this);
83 std::string optim = config::get_value<std::string>("network/optim");
84 bool select = config::get_value<bool>("network/maxmin-selective-update");
86 if (optim == "Lazy") {
87 xbt_assert(select || config::is_default("network/maxmin-selective-update"),
88 "You cannot disable network selective update when using the lazy update mechanism");
92 set_maxmin_system(new lmm::System(select));
93 loopback_ = NetworkCm02Model::create_link("__loopback__",
94 std::vector<double>{config::get_value<double>("network/loopback-bw")},
95 s4u::Link::SharingPolicy::FATPIPE)
96 ->set_latency(config::get_value<double>("network/loopback-lat"));
100 LinkImpl* NetworkCm02Model::create_link(const std::string& name, const std::vector<double>& bandwidths,
101 s4u::Link::SharingPolicy policy)
103 if (policy == s4u::Link::SharingPolicy::WIFI)
104 return (new NetworkWifiLink(name, bandwidths, get_maxmin_system()))->set_model(this);
106 xbt_assert(bandwidths.size() == 1, "Non-WIFI links must use only 1 bandwidth.");
107 return (new NetworkCm02Link(name, bandwidths[0], policy, get_maxmin_system()))->set_model(this);
110 void NetworkCm02Model::update_actions_state_lazy(double now, double /*delta*/)
112 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_surf_precision)) {
113 auto* action = static_cast<NetworkCm02Action*>(get_action_heap().pop());
114 XBT_DEBUG("Something happened to action %p", action);
116 // if I am wearing a latency hat
117 if (action->get_type() == ActionHeap::Type::latency) {
118 XBT_DEBUG("Latency paid for action %p. Activating", action);
119 get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
120 get_action_heap().remove(action);
121 action->set_last_update();
123 // if I am wearing a max_duration or normal hat
124 } else if (action->get_type() == ActionHeap::Type::max_duration || action->get_type() == ActionHeap::Type::normal) {
125 // no need to communicate anymore
126 // assume that flows that reached max_duration have remaining of 0
127 XBT_DEBUG("Action %p finished", action);
128 action->finish(Action::State::FINISHED);
129 get_action_heap().remove(action);
134 void NetworkCm02Model::update_actions_state_full(double /*now*/, double delta)
136 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
137 auto& action = static_cast<NetworkCm02Action&>(*it);
138 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
139 XBT_DEBUG("Something happened to action %p", &action);
140 double deltap = delta;
141 if (action.latency_ > 0) {
142 if (action.latency_ > deltap) {
143 double_update(&action.latency_, deltap, sg_surf_precision);
146 double_update(&deltap, action.latency_, sg_surf_precision);
147 action.latency_ = 0.0;
149 if (action.latency_ <= 0.0 && not action.is_suspended())
150 get_maxmin_system()->update_variable_penalty(action.get_variable(), action.sharing_penalty_);
153 if (not action.get_variable()->get_number_of_constraint()) {
154 /* There is actually no link used, hence an infinite bandwidth. This happens often when using models like
155 * vivaldi. In such case, just make sure that the action completes immediately.
157 action.update_remains(action.get_remains());
159 action.update_remains(action.get_variable()->get_value() * delta);
161 if (action.get_max_duration() != NO_MAX_DURATION)
162 action.update_max_duration(delta);
164 if (((action.get_remains() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
165 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
166 action.finish(Action::State::FINISHED);
171 Action* NetworkCm02Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
173 double latency = 0.0;
174 std::vector<LinkImpl*> back_route;
175 std::vector<LinkImpl*> route;
177 XBT_IN("(%s,%s,%g,%g)", src->get_cname(), dst->get_cname(), size, rate);
179 src->route_to(dst, route, &latency);
180 xbt_assert(not route.empty() || latency > 0,
181 "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
182 src->get_cname(), dst->get_cname());
184 bool failed = std::any_of(route.begin(), route.end(), [](const LinkImpl* link) { return not link->is_on(); });
186 if (cfg_crosstraffic) {
187 dst->route_to(src, back_route, nullptr);
190 std::any_of(back_route.begin(), back_route.end(), [](const LinkImpl* link) { return not link->is_on(); });
193 NetworkWifiLink* src_wifi_link = nullptr;
194 NetworkWifiLink* dst_wifi_link = nullptr;
195 if (not route.empty() && route.front()->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
196 src_wifi_link = static_cast<NetworkWifiLink*>(route.front());
197 xbt_assert(src_wifi_link->get_host_rate(src) != -1,
198 "The route from %s to %s begins with the WIFI link %s, but the host %s does not seem attached to that "
199 "WIFI link. Did you call link->set_host_rate()?",
200 src->get_cname(), dst->get_cname(), src_wifi_link->get_cname(), src->get_cname());
202 if (route.size() > 1 && route.back()->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
203 dst_wifi_link = static_cast<NetworkWifiLink*>(route.back());
204 xbt_assert(dst_wifi_link->get_host_rate(dst) != -1,
205 "The route from %s to %s ends with the WIFI link %s, but the host %s does not seem attached to that "
206 "WIFI link. Did you call link->set_host_rate()?",
207 src->get_cname(), dst->get_cname(), dst_wifi_link->get_cname(), dst->get_cname());
209 if (route.size() > 2)
210 for (unsigned i = 1; i < route.size() - 1; i++)
211 xbt_assert(route[i]->get_sharing_policy() != s4u::Link::SharingPolicy::WIFI,
212 "Link '%s' is a WIFI link. It can only be at the beginning or the end of the route from '%s' to '%s', "
213 "not in between (it is at position %u out of %zu). "
214 "Did you declare an access_point in your WIFI zones?",
215 route[i]->get_cname(), src->get_cname(), dst->get_cname(), i + 1, route.size());
217 NetworkCm02Action* action;
218 if (src_wifi_link == nullptr && dst_wifi_link == nullptr)
219 action = new NetworkCm02Action(this, *src, *dst, size, failed);
221 action = new NetworkWifiAction(this, *src, *dst, size, failed, src_wifi_link, dst_wifi_link);
222 action->sharing_penalty_ = latency;
223 action->latency_ = latency;
224 action->set_user_bound(rate);
226 if (is_update_lazy()) {
227 action->set_last_update();
230 if (sg_weight_S_parameter > 0) {
231 action->sharing_penalty_ =
232 std::accumulate(route.begin(), route.end(), action->sharing_penalty_, [](double total, LinkImpl* const& link) {
233 return total + sg_weight_S_parameter / link->get_bandwidth();
237 double bandwidth_bound = route.empty() ? -1.0 : get_bandwidth_factor(size) * route.front()->get_bandwidth();
239 for (auto const& link : route)
240 bandwidth_bound = std::min(bandwidth_bound, get_bandwidth_factor(size) * link->get_bandwidth());
242 action->lat_current_ = action->latency_;
243 action->latency_ *= get_latency_factor(size);
244 action->set_user_bound(get_bandwidth_constraint(action->get_user_bound(), bandwidth_bound, size));
246 size_t constraints_per_variable = route.size();
247 constraints_per_variable += back_route.size();
249 if (action->latency_ > 0) {
250 action->set_variable(get_maxmin_system()->variable_new(action, 0.0, -1.0, constraints_per_variable));
251 if (is_update_lazy()) {
252 // add to the heap the event when the latency is paid
253 double date = action->latency_ + action->get_last_update();
255 ActionHeap::Type type = route.empty() ? ActionHeap::Type::normal : ActionHeap::Type::latency;
257 XBT_DEBUG("Added action (%p) one latency event at date %f", action, date);
258 get_action_heap().insert(action, date, type);
261 action->set_variable(get_maxmin_system()->variable_new(action, 1.0, -1.0, constraints_per_variable));
263 if (action->get_user_bound() < 0) {
264 get_maxmin_system()->update_variable_bound(
265 action->get_variable(), (action->lat_current_ > 0) ? cfg_tcp_gamma / (2.0 * action->lat_current_) : -1.0);
267 get_maxmin_system()->update_variable_bound(
268 action->get_variable(), (action->lat_current_ > 0)
269 ? std::min(action->get_user_bound(), cfg_tcp_gamma / (2.0 * action->lat_current_))
270 : action->get_user_bound());
273 if (src_wifi_link != nullptr)
274 get_maxmin_system()->expand(src_wifi_link->get_constraint(), action->get_variable(),
275 1.0 / src_wifi_link->get_host_rate(src));
276 if (dst_wifi_link != nullptr)
277 get_maxmin_system()->expand(dst_wifi_link->get_constraint(), action->get_variable(),
278 1.0 / dst_wifi_link->get_host_rate(dst));
280 for (auto const* link : route) {
281 // WIFI links are handled manually just above, so skip them now
282 if (link->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
283 xbt_assert(link == src_wifi_link || link == dst_wifi_link,
284 "Wifi links can only occur at the beginning of the route (meaning that it's attached to the src) or "
285 "at its end (meaning that it's attached to the dst");
287 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), 1.0);
291 if (cfg_crosstraffic) {
292 XBT_DEBUG("Crosstraffic active: adding backward flow using 5%% of the available bandwidth");
293 if (dst_wifi_link != nullptr)
294 get_maxmin_system()->expand(dst_wifi_link->get_constraint(), action->get_variable(),
295 .05 / dst_wifi_link->get_host_rate(dst));
296 if (src_wifi_link != nullptr)
297 get_maxmin_system()->expand(src_wifi_link->get_constraint(), action->get_variable(),
298 .05 / src_wifi_link->get_host_rate(src));
299 for (auto const* link : back_route)
300 if (link->get_sharing_policy() != s4u::Link::SharingPolicy::WIFI)
301 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), .05);
302 // Change concurrency_share here, if you want that cross-traffic is included in the SURF concurrency
303 // (You would also have to change simgrid::kernel::lmm::Element::get_concurrency())
304 // action->getVariable()->set_concurrency_share(2)
308 simgrid::s4u::Link::on_communicate(*action);
315 NetworkCm02Link::NetworkCm02Link(const std::string& name, double bandwidth, s4u::Link::SharingPolicy policy,
316 kernel::lmm::System* system)
319 bandwidth_.scale = 1.0;
320 bandwidth_.peak = bandwidth;
321 this->set_constraint(system->constraint_new(this, sg_bandwidth_factor * bandwidth));
323 if (policy == s4u::Link::SharingPolicy::FATPIPE)
324 get_constraint()->unshare();
327 void NetworkCm02Link::apply_event(kernel::profile::Event* triggered, double value)
329 /* Find out which of my iterators was triggered, and react accordingly */
330 if (triggered == bandwidth_.event) {
331 set_bandwidth(value);
332 tmgr_trace_event_unref(&bandwidth_.event);
334 } else if (triggered == latency_.event) {
336 tmgr_trace_event_unref(&latency_.event);
338 } else if (triggered == state_event_) {
343 tmgr_trace_event_unref(&state_event_);
345 xbt_die("Unknown event!\n");
348 XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)",
352 void NetworkCm02Link::set_bandwidth(double value)
354 bandwidth_.peak = value;
356 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
357 sg_bandwidth_factor * (bandwidth_.peak * bandwidth_.scale));
359 LinkImpl::on_bandwidth_change();
361 if (sg_weight_S_parameter > 0) {
362 double delta = sg_weight_S_parameter / value - sg_weight_S_parameter / (bandwidth_.peak * bandwidth_.scale);
364 const kernel::lmm::Variable* var;
365 const kernel::lmm::Element* elem = nullptr;
366 const kernel::lmm::Element* nextelem = nullptr;
368 while ((var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem))) {
369 auto* action = static_cast<NetworkCm02Action*>(var->get_id());
370 action->sharing_penalty_ += delta;
371 if (not action->is_suspended())
372 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
377 LinkImpl* NetworkCm02Link::set_latency(double value)
379 latency_check(value);
381 double delta = value - latency_.peak;
382 const kernel::lmm::Variable* var;
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 ((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