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 "network_interface.hpp"
7 #include "simgrid/s4u/Engine.hpp"
8 #include "simgrid/sg_config.hpp"
9 #include "src/kernel/resource/profile/Profile.hpp"
10 #include "src/surf/surf_interface.hpp"
11 #include "surf/surf.hpp"
13 #ifndef NETWORK_INTERFACE_CPP_
14 #define NETWORK_INTERFACE_CPP_
16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(res_network, ker_resource, "Network resources, that fuels communications");
22 simgrid::kernel::resource::NetworkModel* surf_network_model = nullptr;
28 /** @brief Command-line option 'network/TCP-gamma' -- see @ref options_model_network_gamma */
29 simgrid::config::Flag<double> NetworkModel::cfg_tcp_gamma(
31 "Size of the biggest TCP window (cat /proc/sys/net/ipv4/tcp_[rw]mem for recv/send window; "
32 "Use the last given value, which is the max window size)",
35 /** @brief Command-line option 'network/crosstraffic' -- see @ref options_model_network_crosstraffic */
36 simgrid::config::Flag<bool> NetworkModel::cfg_crosstraffic(
37 "network/crosstraffic",
38 "Activate the interferences between uploads and downloads for fluid max-min models (LV08, CM02)", "yes");
40 NetworkModel::~NetworkModel() = default;
42 double NetworkModel::get_latency_factor(double /*size*/)
44 return sg_latency_factor;
47 double NetworkModel::get_bandwidth_factor(double /*size*/)
49 return sg_bandwidth_factor;
52 double NetworkModel::get_bandwidth_constraint(double rate, double /*bound*/, double /*size*/)
57 double NetworkModel::next_occurring_event_full(double now)
59 double minRes = Model::next_occurring_event_full(now);
61 for (Action const& action : *get_started_action_set()) {
62 const auto& net_action = static_cast<const NetworkAction&>(action);
63 if (net_action.latency_ > 0)
64 minRes = (minRes < 0) ? net_action.latency_ : std::min(minRes, net_action.latency_);
67 XBT_DEBUG("Min of share resources %f", minRes);
76 LinkImpl::LinkImpl(const std::string& name) : Resource_T(name), piface_(this)
78 if (name != "__loopback__")
79 xbt_assert(not s4u::Link::by_name_or_null(name), "Link '%s' declared several times in the platform.", name.c_str());
84 s4u::Engine::get_instance()->link_register(name, &piface_);
85 XBT_DEBUG("Create link '%s'", name.c_str());
88 /** @brief Fire the required callbacks and destroy the object
90 * Don't delete directly a Link, call l->destroy() instead.
92 void LinkImpl::destroy()
94 s4u::Link::on_destruction(this->piface_);
98 bool LinkImpl::is_used() const
100 return get_model()->get_maxmin_system()->constraint_used(get_constraint());
103 double LinkImpl::get_latency() const
105 return latency_.peak * latency_.scale;
108 double LinkImpl::get_bandwidth() const
110 return bandwidth_.peak * bandwidth_.scale;
113 s4u::Link::SharingPolicy LinkImpl::get_sharing_policy() const
115 return get_constraint()->get_sharing_policy();
118 void LinkImpl::latency_check(double latency)
120 static double last_warned_latency = sg_surf_precision;
121 if (latency != 0.0 && latency < last_warned_latency) {
122 XBT_WARN("Latency for link %s is smaller than surf/precision (%g < %g)."
123 " For more accuracy, consider setting \"--cfg=surf/precision:%g\".",
124 get_cname(), latency, sg_surf_precision, latency);
125 last_warned_latency = latency;
129 void LinkImpl::turn_on()
133 s4u::Link::on_state_change(this->piface_);
137 void LinkImpl::turn_off()
140 Resource::turn_off();
141 s4u::Link::on_state_change(this->piface_);
143 const kernel::lmm::Variable* var;
144 const kernel::lmm::Element* elem = nullptr;
145 double now = surf_get_clock();
146 while ((var = get_constraint()->get_variable(&elem))) {
147 Action* action = var->get_id();
148 if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED) {
149 action->set_finish_time(now);
150 action->set_state(Action::State::FAILED);
156 void LinkImpl::seal()
159 simgrid::s4u::Link::on_creation(*get_iface());
162 void LinkImpl::on_bandwidth_change() const
164 s4u::Link::on_bandwidth_change(this->piface_);
167 void LinkImpl::set_bandwidth_profile(profile::Profile* profile)
169 xbt_assert(bandwidth_.event == nullptr, "Cannot set a second bandwidth profile to Link %s", get_cname());
170 bandwidth_.event = profile->schedule(&profile::future_evt_set, this);
173 void LinkImpl::set_latency_profile(profile::Profile* profile)
175 xbt_assert(latency_.event == nullptr, "Cannot set a second latency profile to Link %s", get_cname());
176 latency_.event = profile->schedule(&profile::future_evt_set, this);
183 void NetworkAction::set_state(Action::State state)
185 Action::State previous = get_state();
186 Action::set_state(state);
187 if (previous != state) // Trigger only if the state changed
188 s4u::Link::on_communication_state_change(*this, previous);
191 /** @brief returns a list of all Links that this action is using */
192 std::list<LinkImpl*> NetworkAction::get_links() const
194 std::list<LinkImpl*> retlist;
195 int llen = get_variable()->get_number_of_constraint();
197 for (int i = 0; i < llen; i++) {
198 /* Beware of composite actions: ptasks put links and cpus together */
199 // extra pb: we cannot dynamic_cast from void*...
200 Resource* resource = get_variable()->get_constraint(i)->get_id();
201 auto* link = dynamic_cast<LinkImpl*>(resource);
203 retlist.push_back(link);
209 } // namespace kernel
212 #endif /* NETWORK_INTERFACE_CPP_ */