1 /* Copyright (c) 2004-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #ifndef SURF_NETWORK_INTERFACE_HPP_
8 #define SURF_NETWORK_INTERFACE_HPP_
12 #include <unordered_map>
16 #include "surf_interface.hpp"
17 #include "src/surf/PropertyHolder.hpp"
19 #include "simgrid/link.h"
30 /** @brief Callback signal fired when the state of a NetworkAction changes
31 * Signature: `void(NetworkAction *action, simgrid::surf::Action::State old, simgrid::surf::Action::State current)` */
32 XBT_PUBLIC_DATA(simgrid::xbt::signal<void(simgrid::surf::NetworkAction*, simgrid::surf::Action::State, simgrid::surf::Action::State)>) networkActionStateChangedCallbacks;
38 /** @ingroup SURF_network_interface
39 * @brief SURF network model interface class
40 * @details A model is an object which handles the interactions between its Resources and its Actions
42 class NetworkModel : public Model {
44 /** @brief Constructor */
45 NetworkModel() : Model() { }
47 /** @brief Destructor */
48 ~NetworkModel() override;
51 * @brief Create a Link
53 * @param name The name of the Link
54 * @param bandwidth The initial bandwidth of the Link in bytes per second
55 * @param latency The initial latency of the Link in seconds
56 * @param policy The sharing policy of the Link
58 virtual LinkImpl* createLink(const char* name, double bandwidth, double latency,
59 e_surf_link_sharing_policy_t policy) = 0;
62 * @brief Create a communication between two hosts.
63 * @details It makes calls to the routing part, and execute the communication
64 * between the two end points.
66 * @param src The source of the communication
67 * @param dst The destination of the communication
68 * @param size The size of the communication in bytes
69 * @param rate Allows to limit the transfer rate. Negative value means
71 * @return The action representing the communication
73 virtual Action* communicate(simgrid::s4u::Host* src, simgrid::s4u::Host* dst, double size, double rate) = 0;
75 /** @brief Function pointer to the function to use to solve the lmm_system_t
77 * @param system The lmm_system_t to solve
79 void (*f_networkSolve)(lmm_system_t) = lmm_solve;
82 * @brief Get the right multiplicative factor for the latency.
83 * @details Depending on the model, the effective latency when sending
84 * a message might be different from the theoretical latency of the link,
85 * in function of the message size. In order to account for this, this
86 * function gets this factor.
88 * @param size The size of the message.
89 * @return The latency factor.
91 virtual double latencyFactor(double size);
94 * @brief Get the right multiplicative factor for the bandwidth.
95 * @details Depending on the model, the effective bandwidth when sending
96 * a message might be different from the theoretical bandwidth of the link,
97 * in function of the message size. In order to account for this, this
98 * function gets this factor.
100 * @param size The size of the message.
101 * @return The bandwidth factor.
103 virtual double bandwidthFactor(double size);
106 * @brief Get definitive bandwidth.
107 * @details It gives the minimum bandwidth between the one that would
108 * occur if no limitation was enforced, and the one arbitrary limited.
109 * @param rate The desired maximum bandwidth.
110 * @param bound The bandwidth with only the network taken into account.
111 * @param size The size of the message.
112 * @return The new bandwidth.
114 virtual double bandwidthConstraint(double rate, double bound, double size);
115 double nextOccuringEventFull(double now) override;
117 LinkImpl* loopback_ = nullptr;
123 /** @ingroup SURF_network_interface
124 * @brief SURF network link interface class
125 * @details A Link represents the link between two [hosts](\ref simgrid::surf::HostImpl)
127 class LinkImpl : public simgrid::surf::Resource, public simgrid::surf::PropertyHolder {
129 /** @brief Constructor of LMM links */
130 LinkImpl(simgrid::surf::NetworkModel* model, const char* name, lmm_constraint_t constraint);
132 /* Link destruction logic */
133 /**************************/
135 ~LinkImpl() override;
137 void destroy(); // Must be called instead of the destructor
139 bool currentlyDestroying_ = false;
142 /** @brief Callback signal fired when a new Link is created */
143 static simgrid::xbt::signal<void(surf::LinkImpl*)> onCreation;
145 /** @brief Callback signal fired when a Link is destroyed */
146 static simgrid::xbt::signal<void(surf::LinkImpl*)> onDestruction;
148 /** @brief Callback signal fired when the state of a Link changes (when it is turned on or off) */
149 static simgrid::xbt::signal<void(surf::LinkImpl*)> onStateChange;
151 /** @brief Callback signal fired when a communication starts */
152 static simgrid::xbt::signal<void(surf::NetworkAction*, s4u::Host* src, s4u::Host* dst)> onCommunicate;
154 /** @brief Get the bandwidth in bytes per second of current Link */
155 virtual double bandwidth();
157 /** @brief Update the bandwidth in bytes per second of current Link */
158 virtual void setBandwidth(double value) = 0;
160 /** @brief Get the latency in seconds of current Link */
161 virtual double latency();
163 /** @brief Update the latency in seconds of current Link */
164 virtual void setLatency(double value) = 0;
166 /** @brief The sharing policy is a @{link e_surf_link_sharing_policy_t::EType} (0: FATPIPE, 1: SHARED, 2:
168 virtual int sharingPolicy();
170 /** @brief Check if the Link is used */
171 bool isUsed() override;
173 void turnOn() override;
174 void turnOff() override;
176 virtual void setStateTrace(tmgr_trace_t trace); /*< setup the trace file with states events (ON or OFF).
177 Trace must contain boolean values. */
178 virtual void setBandwidthTrace(tmgr_trace_t trace); /*< setup the trace file with bandwidth events (peak speed changes due to external load).
179 Trace must contain percentages (value between 0 and 1). */
180 virtual void setLatencyTrace(tmgr_trace_t trace); /*< setup the trace file with latency events (peak latency changes due to external load).
181 Trace must contain absolute values */
183 tmgr_trace_iterator_t stateEvent_ = nullptr;
184 s_surf_metric_t latency_ = {1.0, 0, nullptr};
185 s_surf_metric_t bandwidth_ = {1.0, 0, nullptr};
189 void *getData() { return userData;}
190 void setData(void *d) { userData=d;}
192 void *userData = nullptr;
194 /* List of all links. FIXME: should move to the Engine */
196 static std::unordered_map<std::string, LinkImpl*>* links;
199 static LinkImpl* byName(const char* name);
200 static int linksCount();
201 static LinkImpl** linksList();
202 static void linksExit();
208 /** @ingroup SURF_network_interface
209 * @brief SURF network action interface class
210 * @details A NetworkAction represents a communication between two [hosts](\ref HostImpl)
212 class NetworkAction : public simgrid::surf::Action {
214 /** @brief Constructor
216 * @param model The NetworkModel associated to this NetworkAction
217 * @param cost The cost of this NetworkAction in [TODO]
218 * @param failed [description]
220 NetworkAction(simgrid::surf::Model *model, double cost, bool failed)
221 : simgrid::surf::Action(model, cost, failed) {}
224 * @brief NetworkAction constructor
226 * @param model The NetworkModel associated to this NetworkAction
227 * @param cost The cost of this NetworkAction in [TODO]
228 * @param failed [description]
229 * @param var The lmm variable associated to this Action if it is part of a
232 NetworkAction(simgrid::surf::Model *model, double cost, bool failed, lmm_variable_t var)
233 : simgrid::surf::Action(model, cost, failed, var) {};
235 void setState(simgrid::surf::Action::State state) override;
241 const char* senderLinkName_;
243 xbt_fifo_item_t senderFifoItem_;
248 #endif /* SURF_NETWORK_INTERFACE_HPP_ */