1 /* Copyright (c) 2013-2023. 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 <simgrid/kernel/routing/NetZoneImpl.hpp>
7 #include <simgrid/s4u/Engine.hpp>
9 #include "src/kernel/EngineImpl.hpp"
10 #include "src/kernel/resource/models/network_constant.hpp"
12 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_network);
17 SIMGRID_REGISTER_NETWORK_MODEL(
19 "Simplistic network model where all communication take a constant time (one second). This model "
20 "provides the lowest realism, but is (marginally) faster. It is mostly useful when studying theoretical "
21 "distributed algorithms where the network is usually abstracted away.",
23 auto net_model = std::make_shared<simgrid::kernel::resource::NetworkConstantModel>("Network_Constant");
24 auto* engine = simgrid::kernel::EngineImpl::get_instance();
25 engine->add_model(net_model);
26 engine->get_netzone_root()->set_network_model(net_model);
29 namespace simgrid::kernel::resource {
31 StandardLinkImpl* NetworkConstantModel::create_link(const std::string& name, const std::vector<double>& /*bandwidth*/)
33 xbt_die("Refusing to create the link %s: there is no link in the Constant network model. "
34 "Please remove any link from your platform (and switch to routing='None')",
39 StandardLinkImpl* NetworkConstantModel::create_wifi_link(const std::string& name, const std::vector<double>& bandwidths)
41 return create_link(name, bandwidths);
44 double NetworkConstantModel::next_occurring_event(double /*now*/)
47 for (Action const& action : *get_started_action_set()) {
48 const auto& net_action = static_cast<const NetworkConstantAction&>(action);
49 if (net_action.latency_ > 0 && (min < 0 || net_action.latency_ < min))
50 min = net_action.latency_;
55 void NetworkConstantModel::update_actions_state(double /*now*/, double delta)
57 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
58 auto& action = static_cast<NetworkConstantAction&>(*it);
59 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
60 if (action.latency_ > 0) {
61 if (action.latency_ > delta) {
62 double_update(&action.latency_, delta, sg_precision_timing);
64 action.latency_ = 0.0;
67 action.update_remains(action.get_cost() * delta / get_latency_factor());
68 action.update_max_duration(delta);
70 if ((action.get_remains_no_update() <= 0) ||
71 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
72 action.finish(Action::State::FINISHED);
77 Action* NetworkConstantModel::communicate(s4u::Host* src, s4u::Host* dst, double size, double /*rate*/,
80 return (new NetworkConstantAction(this, *src, *dst, size));
86 NetworkConstantAction::NetworkConstantAction(NetworkConstantModel* model_, s4u::Host& src, s4u::Host& dst, double size)
87 : NetworkAction(model_, src, dst, size, false)
89 latency_ = model_->get_latency_factor();
91 set_state(Action::State::FINISHED);
94 void NetworkConstantAction::update_remains_lazy(double /*now*/)
99 } // namespace simgrid::kernel::resource