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 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
41 surf_network_model = new simgrid::kernel::resource::NetworkCm02Model();
43 simgrid::config::set_default<double>("network/latency-factor", 13.01);
44 simgrid::config::set_default<double>("network/bandwidth-factor", 0.97);
45 simgrid::config::set_default<double>("network/weight-S", 20537);
48 /***************************************************************************/
49 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
50 /***************************************************************************/
51 /* @TechReport{ rr-lip2002-40, */
52 /* author = {Henri Casanova and Loris Marchal}, */
53 /* institution = {LIP}, */
54 /* title = {A Network Model for Simulation of Grid Application}, */
55 /* number = {2002-40}, */
59 void surf_network_model_init_CM02()
61 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
63 simgrid::config::set_default<double>("network/latency-factor", 1.0);
64 simgrid::config::set_default<double>("network/bandwidth-factor", 1.0);
65 simgrid::config::set_default<double>("network/weight-S", 0.0);
67 surf_network_model = new simgrid::kernel::resource::NetworkCm02Model();
74 NetworkCm02Model::NetworkCm02Model()
75 : NetworkModel(config::get_value<std::string>("network/optim") == "Full" ? Model::UpdateAlgo::FULL
76 : Model::UpdateAlgo::LAZY)
78 all_existing_models.push_back(this);
79 models_by_type[simgrid::kernel::resource::Model::Type::NETWORK].push_back(this);
81 std::string optim = config::get_value<std::string>("network/optim");
82 bool select = config::get_value<bool>("network/maxmin-selective-update");
84 if (optim == "Lazy") {
85 xbt_assert(select || config::is_default("network/maxmin-selective-update"),
86 "You cannot disable network selective update when using the lazy update mechanism");
90 set_maxmin_system(new lmm::System(select));
91 loopback_ = NetworkCm02Model::create_link("__loopback__",
92 std::vector<double>{config::get_value<double>("network/loopback-bw")},
93 s4u::Link::SharingPolicy::FATPIPE)
94 ->set_latency(config::get_value<double>("network/loopback-lat"));
98 LinkImpl* NetworkCm02Model::create_link(const std::string& name, const std::vector<double>& bandwidths,
99 s4u::Link::SharingPolicy policy)
101 if (policy == s4u::Link::SharingPolicy::WIFI)
102 return (new NetworkWifiLink(name, bandwidths, get_maxmin_system()))->set_model(this);
104 xbt_assert(bandwidths.size() == 1, "Non-WIFI links must use only 1 bandwidth.");
105 return (new NetworkCm02Link(name, bandwidths[0], policy, get_maxmin_system()))->set_model(this);
108 void NetworkCm02Model::update_actions_state_lazy(double now, double /*delta*/)
110 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_surf_precision)) {
111 auto* action = static_cast<NetworkCm02Action*>(get_action_heap().pop());
112 XBT_DEBUG("Something happened to action %p", action);
114 // if I am wearing a latency hat
115 if (action->get_type() == ActionHeap::Type::latency) {
116 XBT_DEBUG("Latency paid for action %p. Activating", action);
117 get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
118 get_action_heap().remove(action);
119 action->set_last_update();
121 // if I am wearing a max_duration or normal hat
122 } else if (action->get_type() == ActionHeap::Type::max_duration || action->get_type() == ActionHeap::Type::normal) {
123 // no need to communicate anymore
124 // assume that flows that reached max_duration have remaining of 0
125 XBT_DEBUG("Action %p finished", action);
126 action->finish(Action::State::FINISHED);
127 get_action_heap().remove(action);
132 void NetworkCm02Model::update_actions_state_full(double /*now*/, double delta)
134 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
135 auto& action = static_cast<NetworkCm02Action&>(*it);
136 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
137 XBT_DEBUG("Something happened to action %p", &action);
138 double deltap = delta;
139 if (action.latency_ > 0) {
140 if (action.latency_ > deltap) {
141 double_update(&action.latency_, deltap, sg_surf_precision);
144 double_update(&deltap, action.latency_, sg_surf_precision);
145 action.latency_ = 0.0;
147 if (action.latency_ <= 0.0 && not action.is_suspended())
148 get_maxmin_system()->update_variable_penalty(action.get_variable(), action.sharing_penalty_);
151 if (not action.get_variable()->get_number_of_constraint()) {
152 /* There is actually no link used, hence an infinite bandwidth. This happens often when using models like
153 * vivaldi. In such case, just make sure that the action completes immediately.
155 action.update_remains(action.get_remains());
157 action.update_remains(action.get_variable()->get_value() * delta);
159 if (action.get_max_duration() != NO_MAX_DURATION)
160 action.update_max_duration(delta);
162 if (((action.get_remains() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
163 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
164 action.finish(Action::State::FINISHED);
169 Action* NetworkCm02Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
171 double latency = 0.0;
172 std::vector<LinkImpl*> back_route;
173 std::vector<LinkImpl*> route;
175 XBT_IN("(%s,%s,%g,%g)", src->get_cname(), dst->get_cname(), size, rate);
177 src->route_to(dst, route, &latency);
178 xbt_assert(not route.empty() || latency > 0,
179 "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
180 src->get_cname(), dst->get_cname());
182 bool failed = std::any_of(route.begin(), route.end(), [](const LinkImpl* link) { return not link->is_on(); });
184 if (cfg_crosstraffic) {
185 dst->route_to(src, back_route, nullptr);
188 std::any_of(back_route.begin(), back_route.end(), [](const LinkImpl* link) { return not link->is_on(); });
191 NetworkWifiLink* src_wifi_link = nullptr;
192 NetworkWifiLink* dst_wifi_link = nullptr;
193 if (not route.empty() && route.front()->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
194 src_wifi_link = static_cast<NetworkWifiLink*>(route.front());
195 xbt_assert(src_wifi_link->get_host_rate(src) != -1,
196 "The route from %s to %s begins with the WIFI link %s, but the host %s does not seem attached to that "
197 "WIFI link. Did you call link->set_host_rate()?",
198 src->get_cname(), dst->get_cname(), src_wifi_link->get_cname(), src->get_cname());
200 if (route.size() > 1 && route.back()->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
201 dst_wifi_link = static_cast<NetworkWifiLink*>(route.back());
202 xbt_assert(dst_wifi_link->get_host_rate(dst) != -1,
203 "The route from %s to %s ends with the WIFI link %s, but the host %s does not seem attached to that "
204 "WIFI link. Did you call link->set_host_rate()?",
205 src->get_cname(), dst->get_cname(), dst_wifi_link->get_cname(), dst->get_cname());
207 if (route.size() > 2)
208 for (unsigned i = 1; i < route.size() - 1; i++)
209 xbt_assert(route[i]->get_sharing_policy() != s4u::Link::SharingPolicy::WIFI,
210 "Link '%s' is a WIFI link. It can only be at the beginning or the end of the route from '%s' to '%s', "
211 "not in between (it is at position %u out of %zu). "
212 "Did you declare an access_point in your WIFI zones?",
213 route[i]->get_cname(), src->get_cname(), dst->get_cname(), i + 1, route.size());
215 NetworkCm02Action* action;
216 if (src_wifi_link == nullptr && dst_wifi_link == nullptr)
217 action = new NetworkCm02Action(this, *src, *dst, size, failed);
219 action = new NetworkWifiAction(this, *src, *dst, size, failed, src_wifi_link, dst_wifi_link);
220 action->sharing_penalty_ = latency;
221 action->latency_ = latency;
222 action->set_user_bound(rate);
224 if (is_update_lazy()) {
225 action->set_last_update();
228 if (sg_weight_S_parameter > 0) {
229 action->sharing_penalty_ =
230 std::accumulate(route.begin(), route.end(), action->sharing_penalty_, [](double total, LinkImpl* const& link) {
231 return total + sg_weight_S_parameter / link->get_bandwidth();
235 double bandwidth_bound = route.empty() ? -1.0 : get_bandwidth_factor(size) * route.front()->get_bandwidth();
237 for (auto const& link : route)
238 bandwidth_bound = std::min(bandwidth_bound, get_bandwidth_factor(size) * link->get_bandwidth());
240 action->lat_current_ = action->latency_;
241 action->latency_ *= get_latency_factor(size);
242 action->set_user_bound(get_bandwidth_constraint(action->get_user_bound(), bandwidth_bound, size));
244 size_t constraints_per_variable = route.size();
245 constraints_per_variable += back_route.size();
247 if (action->latency_ > 0) {
248 action->set_variable(get_maxmin_system()->variable_new(action, 0.0, -1.0, constraints_per_variable));
249 if (is_update_lazy()) {
250 // add to the heap the event when the latency is paid
251 double date = action->latency_ + action->get_last_update();
253 ActionHeap::Type type = route.empty() ? ActionHeap::Type::normal : ActionHeap::Type::latency;
255 XBT_DEBUG("Added action (%p) one latency event at date %f", action, date);
256 get_action_heap().insert(action, date, type);
259 action->set_variable(get_maxmin_system()->variable_new(action, 1.0, -1.0, constraints_per_variable));
261 if (action->get_user_bound() < 0) {
262 get_maxmin_system()->update_variable_bound(
263 action->get_variable(), (action->lat_current_ > 0) ? cfg_tcp_gamma / (2.0 * action->lat_current_) : -1.0);
265 get_maxmin_system()->update_variable_bound(
266 action->get_variable(), (action->lat_current_ > 0)
267 ? std::min(action->get_user_bound(), cfg_tcp_gamma / (2.0 * action->lat_current_))
268 : action->get_user_bound());
271 if (src_wifi_link != nullptr)
272 get_maxmin_system()->expand(src_wifi_link->get_constraint(), action->get_variable(),
273 1.0 / src_wifi_link->get_host_rate(src));
274 if (dst_wifi_link != nullptr)
275 get_maxmin_system()->expand(dst_wifi_link->get_constraint(), action->get_variable(),
276 1.0 / dst_wifi_link->get_host_rate(dst));
278 for (auto const* link : route) {
279 // WIFI links are handled manually just above, so skip them now
280 if (link->get_sharing_policy() == s4u::Link::SharingPolicy::WIFI) {
281 xbt_assert(link == src_wifi_link || link == dst_wifi_link,
282 "Wifi links can only occur at the beginning of the route (meaning that it's attached to the src) or "
283 "at its end (meaning that it's attached to the dst");
285 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), 1.0);
289 if (cfg_crosstraffic) {
290 XBT_DEBUG("Crosstraffic active: adding backward flow using 5%% of the available bandwidth");
291 if (dst_wifi_link != nullptr)
292 get_maxmin_system()->expand(dst_wifi_link->get_constraint(), action->get_variable(),
293 .05 / dst_wifi_link->get_host_rate(dst));
294 if (src_wifi_link != nullptr)
295 get_maxmin_system()->expand(src_wifi_link->get_constraint(), action->get_variable(),
296 .05 / src_wifi_link->get_host_rate(src));
297 for (auto const* link : back_route)
298 if (link->get_sharing_policy() != s4u::Link::SharingPolicy::WIFI)
299 get_maxmin_system()->expand(link->get_constraint(), action->get_variable(), .05);
300 // Change concurrency_share here, if you want that cross-traffic is included in the SURF concurrency
301 // (You would also have to change simgrid::kernel::lmm::Element::get_concurrency())
302 // action->getVariable()->set_concurrency_share(2)
306 simgrid::s4u::Link::on_communicate(*action);
313 NetworkCm02Link::NetworkCm02Link(const std::string& name, double bandwidth, s4u::Link::SharingPolicy policy,
314 kernel::lmm::System* system)
317 bandwidth_.scale = 1.0;
318 bandwidth_.peak = bandwidth;
319 this->set_constraint(system->constraint_new(this, sg_bandwidth_factor * bandwidth));
321 if (policy == s4u::Link::SharingPolicy::FATPIPE)
322 get_constraint()->unshare();
325 void NetworkCm02Link::apply_event(kernel::profile::Event* triggered, double value)
327 /* Find out which of my iterators was triggered, and react accordingly */
328 if (triggered == bandwidth_.event) {
329 set_bandwidth(value);
330 tmgr_trace_event_unref(&bandwidth_.event);
332 } else if (triggered == latency_.event) {
334 tmgr_trace_event_unref(&latency_.event);
336 } else if (triggered == state_event_) {
341 tmgr_trace_event_unref(&state_event_);
343 xbt_die("Unknown event!\n");
346 XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)",
350 void NetworkCm02Link::set_bandwidth(double value)
352 bandwidth_.peak = value;
354 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
355 sg_bandwidth_factor * (bandwidth_.peak * bandwidth_.scale));
357 LinkImpl::on_bandwidth_change();
359 if (sg_weight_S_parameter > 0) {
360 double delta = sg_weight_S_parameter / value - sg_weight_S_parameter / (bandwidth_.peak * bandwidth_.scale);
362 const kernel::lmm::Variable* var;
363 const kernel::lmm::Element* elem = nullptr;
364 const kernel::lmm::Element* nextelem = nullptr;
366 while ((var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem))) {
367 auto* action = static_cast<NetworkCm02Action*>(var->get_id());
368 action->sharing_penalty_ += delta;
369 if (not action->is_suspended())
370 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
375 LinkImpl* NetworkCm02Link::set_latency(double value)
377 latency_check(value);
379 double delta = value - latency_.peak;
380 const kernel::lmm::Variable* var;
381 const kernel::lmm::Element* elem = nullptr;
382 const kernel::lmm::Element* nextelem = nullptr;
385 latency_.scale = 1.0;
386 latency_.peak = value;
388 while ((var = get_constraint()->get_variable_safe(&elem, &nextelem, &numelem))) {
389 auto* action = static_cast<NetworkCm02Action*>(var->get_id());
390 action->lat_current_ += delta;
391 action->sharing_penalty_ += delta;
392 if (action->get_user_bound() < 0)
393 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), NetworkModel::cfg_tcp_gamma /
394 (2.0 * action->lat_current_));
396 get_model()->get_maxmin_system()->update_variable_bound(
397 action->get_variable(),
398 std::min(action->get_user_bound(), NetworkModel::cfg_tcp_gamma / (2.0 * action->lat_current_)));
400 if (action->get_user_bound() < NetworkModel::cfg_tcp_gamma / (2.0 * action->lat_current_)) {
401 XBT_INFO("Flow is limited BYBANDWIDTH");
403 XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f", action->lat_current_);
406 if (not action->is_suspended())
407 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), action->sharing_penalty_);
416 void NetworkCm02Action::update_remains_lazy(double now)
418 if (not is_running())
421 double delta = now - get_last_update();
423 if (get_remains_no_update() > 0) {
424 XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, get_remains_no_update(),
426 update_remains(get_last_value() * delta);
428 XBT_DEBUG("Updating action(%p): remains is now %f", this, get_remains_no_update());
431 update_max_duration(delta);
433 if ((get_remains_no_update() <= 0 && (get_variable()->get_penalty() > 0)) ||
434 ((get_max_duration() != NO_MAX_DURATION) && (get_max_duration() <= 0))) {
435 finish(Action::State::FINISHED);
436 get_model()->get_action_heap().remove(this);
440 set_last_value(get_variable()->get_value());
443 } // namespace resource
444 } // namespace kernel
445 } // namespace simgrid