1 /* Copyright (c) 2004-2021. 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 #ifndef SURF_NETWORK_INTERFACE_HPP_
7 #define SURF_NETWORK_INTERFACE_HPP_
9 #include "simgrid/kernel/resource/Model.hpp"
10 #include "simgrid/kernel/resource/NetworkModelIntf.hpp"
11 #include "simgrid/kernel/resource/Resource.hpp"
12 #include "simgrid/s4u/Link.hpp"
13 #include "src/kernel/lmm/maxmin.hpp"
14 #include <xbt/PropertyHolder.hpp>
17 #include <unordered_map>
30 /** @ingroup SURF_network_interface
31 * @brief SURF network model interface class
32 * @details A model is an object which handles the interactions between its Resources and its Actions
34 class NetworkModel : public Model, public NetworkModelIntf {
36 static config::Flag<double> cfg_tcp_gamma;
37 static config::Flag<bool> cfg_crosstraffic;
40 NetworkModel(const NetworkModel&) = delete;
41 NetworkModel& operator=(const NetworkModel&) = delete;
42 ~NetworkModel() override;
45 * @brief Create a [WiFi]Link
47 * @param name The name of the Link
48 * @param bandwidths The vector of bandwidths of the Link in bytes per second
50 virtual LinkImpl* create_link(const std::string& name, const std::vector<double>& bandwidths) = 0;
52 virtual LinkImpl* create_wifi_link(const std::string& name, const std::vector<double>& bandwidths) = 0;
55 * @brief Create a communication between two hosts.
56 * @details It makes calls to the routing part, and execute the communication between the two end points.
58 * @param src The source of the communication
59 * @param dst The destination of the communication
60 * @param size The size of the communication in bytes
61 * @param rate Allows to limit the transfer rate. Negative value means unlimited.
62 * @return The action representing the communication
64 virtual Action* communicate(s4u::Host* src, s4u::Host* dst, double size, double rate) = 0;
67 * @brief Get the right multiplicative factor for the latency.
68 * @details Depending on the model, the effective latency when sending a message might be different from the
69 * theoretical latency of the link, in function of the message size. In order to account for this, this function gets
72 * @param size The size of the message.
73 * @return The latency factor.
75 virtual double get_latency_factor(double /* size */) { return sg_latency_factor; }
78 * @brief Get the right multiplicative factor for the bandwidth.
79 * @details Depending on the model, the effective bandwidth when sending a message might be different from the
80 * theoretical bandwidth of the link, in function of the message size. In order to account for this, this function
83 * @param size The size of the message.
84 * @return The bandwidth factor.
86 virtual double get_bandwidth_factor(double /* size*/) { return sg_bandwidth_factor; }
89 * @brief Get definitive bandwidth.
90 * @details It gives the minimum bandwidth between the one that would occur if no limitation was enforced, and the
91 * one arbitrary limited.
92 * @param rate The desired maximum bandwidth.
93 * @param bound The bandwidth with only the network taken into account.
94 * @param size The size of the message.
95 * @return The new bandwidth.
97 virtual double get_bandwidth_constraint(double rate, double /*bound*/, double /*size*/) { return rate; }
99 double next_occurring_event_full(double now) override;
101 virtual void set_lat_factor_cb(const std::function<NetworkFactorCb>& cb) override { THROW_UNIMPLEMENTED; }
102 virtual void set_bw_factor_cb(const std::function<NetworkFactorCb>& cb) override { THROW_UNIMPLEMENTED; }
104 LinkImpl* loopback_ = nullptr;
110 /** @ingroup SURF_network_interface
111 * @brief SURF network link interface class
112 * @details A Link represents the link between two [hosts](@ref simgrid::surf::HostImpl)
114 class LinkImpl : public Resource_T<LinkImpl>, public xbt::PropertyHolder {
118 explicit LinkImpl(const std::string& name);
119 LinkImpl(const LinkImpl&) = delete;
120 LinkImpl& operator=(const LinkImpl&) = delete;
121 ~LinkImpl() override = default; // Use destroy() instead of this destructor.
124 void destroy(); // Must be called instead of the destructor
126 void latency_check(double latency) const;
128 /** @brief Public interface */
129 const s4u::Link* get_iface() const { return &piface_; }
130 s4u::Link* get_iface() { return &piface_; }
132 /** @brief Get the bandwidth in bytes per second of current Link */
133 double get_bandwidth() const { return bandwidth_.peak * bandwidth_.scale; }
134 /** @brief Update the bandwidth in bytes per second of current Link */
135 virtual void set_bandwidth(double value) = 0;
137 /** @brief Get the latency in seconds of current Link */
138 double get_latency() const { return latency_.peak * latency_.scale; }
139 /** @brief Update the latency in seconds of current Link */
140 virtual LinkImpl* set_latency(double value) = 0;
142 /** @brief The sharing policy */
143 virtual LinkImpl* set_sharing_policy(s4u::Link::SharingPolicy policy);
144 virtual s4u::Link::SharingPolicy get_sharing_policy() const;
146 /** @brief Check if the Link is used */
147 bool is_used() const override;
149 void turn_on() override;
150 void turn_off() override;
152 void seal() override;
154 void on_bandwidth_change() const;
156 /* setup the profile file with bandwidth events (peak speed changes due to external load).
157 * Profile must contain percentages (value between 0 and 1). */
158 virtual LinkImpl* set_bandwidth_profile(kernel::profile::Profile* profile);
159 /* setup the profile file with latency events (peak latency changes due to external load).
160 * Profile must contain absolute values */
161 virtual LinkImpl* set_latency_profile(kernel::profile::Profile* profile);
163 Metric latency_ = {0.0, 0, nullptr};
164 Metric bandwidth_ = {1.0, 0, nullptr};
170 /** @ingroup SURF_network_interface
171 * @brief SURF network action interface class
172 * @details A NetworkAction represents a communication between two [hosts](@ref simgrid::surf::HostImpl)
174 class NetworkAction : public Action {
179 /** @brief Constructor
181 * @param model The NetworkModel associated to this NetworkAction
182 * @param cost The cost of this NetworkAction in [TODO]
183 * @param failed [description]
185 NetworkAction(Model* model, s4u::Host& src, s4u::Host& dst, double cost, bool failed)
186 : Action(model, cost, failed), src_(src), dst_(dst)
191 * @brief NetworkAction constructor
193 * @param model The NetworkModel associated to this NetworkAction
194 * @param cost The cost of this NetworkAction in bytes
195 * @param failed Actions can be created in a failed state
196 * @param var The lmm variable associated to this Action if it is part of a LMM component
198 NetworkAction(Model* model, s4u::Host& src, s4u::Host& dst, double cost, bool failed, lmm::Variable* var)
199 : Action(model, cost, failed, var), src_(src), dst_(dst){};
201 void set_state(Action::State state) override;
202 virtual std::list<LinkImpl*> get_links() const;
204 double latency_ = 0.; // Delay before the action starts
205 double lat_current_ = 0.; // Used to compute the communication RTT, and accordingly limit the communication rate
206 double sharing_penalty_ = {};
208 s4u::Host& get_src() const { return src_; }
209 s4u::Host& get_dst() const { return dst_; }
211 } // namespace resource
212 } // namespace kernel
213 } // namespace simgrid
215 #endif /* SURF_NETWORK_INTERFACE_HPP_ */