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"
20 #include "simgrid/s4u/Link.hpp"
35 /** @ingroup SURF_network_interface
36 * @brief SURF network model interface class
37 * @details A model is an object which handles the interactions between its Resources and its Actions
39 class NetworkModel : public Model {
41 /** @brief Constructor */
42 NetworkModel() : Model() { }
44 /** @brief Destructor */
45 ~NetworkModel() override;
48 * @brief Create a Link
50 * @param name The name of the Link
51 * @param bandwidth The initial bandwidth of the Link in bytes per second
52 * @param latency The initial latency of the Link in seconds
53 * @param policy The sharing policy of the Link
55 virtual LinkImpl* createLink(const char* name, double bandwidth, double latency,
56 e_surf_link_sharing_policy_t policy) = 0;
59 * @brief Create a communication between two hosts.
60 * @details It makes calls to the routing part, and execute the communication
61 * between the two end points.
63 * @param src The source of the communication
64 * @param dst The destination of the communication
65 * @param size The size of the communication in bytes
66 * @param rate Allows to limit the transfer rate. Negative value means
68 * @return The action representing the communication
70 virtual Action* communicate(simgrid::s4u::Host* src, simgrid::s4u::Host* dst, double size, double rate) = 0;
72 /** @brief Function pointer to the function to use to solve the lmm_system_t
74 * @param system The lmm_system_t to solve
76 void (*f_networkSolve)(lmm_system_t) = lmm_solve;
79 * @brief Get the right multiplicative factor for the latency.
80 * @details Depending on the model, the effective latency when sending
81 * a message might be different from the theoretical latency of the link,
82 * in function of the message size. In order to account for this, this
83 * function gets this factor.
85 * @param size The size of the message.
86 * @return The latency factor.
88 virtual double latencyFactor(double size);
91 * @brief Get the right multiplicative factor for the bandwidth.
92 * @details Depending on the model, the effective bandwidth when sending
93 * a message might be different from the theoretical bandwidth of the link,
94 * in function of the message size. In order to account for this, this
95 * function gets this factor.
97 * @param size The size of the message.
98 * @return The bandwidth factor.
100 virtual double bandwidthFactor(double size);
103 * @brief Get definitive bandwidth.
104 * @details It gives the minimum bandwidth between the one that would
105 * occur if no limitation was enforced, and the one arbitrary limited.
106 * @param rate The desired maximum bandwidth.
107 * @param bound The bandwidth with only the network taken into account.
108 * @param size The size of the message.
109 * @return The new bandwidth.
111 virtual double bandwidthConstraint(double rate, double bound, double size);
112 double nextOccuringEventFull(double now) override;
114 LinkImpl* loopback_ = nullptr;
120 /** @ingroup SURF_network_interface
121 * @brief SURF network link interface class
122 * @details A Link represents the link between two [hosts](\ref simgrid::surf::HostImpl)
124 class LinkImpl : public simgrid::surf::Resource, public simgrid::surf::PropertyHolder {
126 LinkImpl(simgrid::surf::NetworkModel* model, const char* name, lmm_constraint_t constraint);
127 ~LinkImpl() override;
129 void destroy(); // Must be called instead of the destructor
131 bool currentlyDestroying_ = false;
134 /** @brief Public interface */
137 /** @brief Get the bandwidth in bytes per second of current Link */
138 virtual double bandwidth();
140 /** @brief Update the bandwidth in bytes per second of current Link */
141 virtual void setBandwidth(double value) = 0;
143 /** @brief Get the latency in seconds of current Link */
144 virtual double latency();
146 /** @brief Update the latency in seconds of current Link */
147 virtual void setLatency(double value) = 0;
149 /** @brief The sharing policy is a @{link e_surf_link_sharing_policy_t::EType} (0: FATPIPE, 1: SHARED, 2:
151 virtual int sharingPolicy();
153 /** @brief Check if the Link is used */
154 bool isUsed() override;
156 void turnOn() override;
157 void turnOff() override;
159 virtual void setStateTrace(tmgr_trace_t trace); /*< setup the trace file with states events (ON or OFF).
160 Trace must contain boolean values. */
161 virtual void setBandwidthTrace(tmgr_trace_t trace); /*< setup the trace file with bandwidth events (peak speed changes due to external load).
162 Trace must contain percentages (value between 0 and 1). */
163 virtual void setLatencyTrace(tmgr_trace_t trace); /*< setup the trace file with latency events (peak latency changes due to external load).
164 Trace must contain absolute values */
166 tmgr_trace_iterator_t stateEvent_ = nullptr;
167 s_surf_metric_t latency_ = {1.0, 0, nullptr};
168 s_surf_metric_t bandwidth_ = {1.0, 0, nullptr};
172 void *getData() { return userData;}
173 void setData(void *d) { userData=d;}
175 void *userData = nullptr;
177 /* List of all links. FIXME: should move to the Engine */
179 static std::unordered_map<std::string, LinkImpl*>* links;
182 static LinkImpl* byName(const char* name);
183 static int linksCount();
184 static LinkImpl** linksList();
185 static void linksExit();
191 /** @ingroup SURF_network_interface
192 * @brief SURF network action interface class
193 * @details A NetworkAction represents a communication between two [hosts](\ref HostImpl)
195 class NetworkAction : public simgrid::surf::Action {
197 /** @brief Constructor
199 * @param model The NetworkModel associated to this NetworkAction
200 * @param cost The cost of this NetworkAction in [TODO]
201 * @param failed [description]
203 NetworkAction(simgrid::surf::Model *model, double cost, bool failed)
204 : simgrid::surf::Action(model, cost, failed) {}
207 * @brief NetworkAction constructor
209 * @param model The NetworkModel associated to this NetworkAction
210 * @param cost The cost of this NetworkAction in [TODO]
211 * @param failed [description]
212 * @param var The lmm variable associated to this Action if it is part of a
215 NetworkAction(simgrid::surf::Model *model, double cost, bool failed, lmm_variable_t var)
216 : simgrid::surf::Action(model, cost, failed, var) {};
218 void setState(simgrid::surf::Action::State state) override;
224 const char* senderLinkName_;
226 xbt_fifo_item_t senderFifoItem_;
231 #endif /* SURF_NETWORK_INTERFACE_HPP_ */