X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/95b307c99d462730e4e813f1343112021123d92e..cef6554994ae17d8f56c9245ad2c10c7cf39af8c:/include/simgrid/s4u/Link.hpp diff --git a/include/simgrid/s4u/Link.hpp b/include/simgrid/s4u/Link.hpp index d5d13bba1d..c2ac18e036 100644 --- a/include/simgrid/s4u/Link.hpp +++ b/include/simgrid/s4u/Link.hpp @@ -1,4 +1,4 @@ -/* Copyright (c) 2004-2020. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2004-2023. The SimGrid Team. All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it * under the terms of the license (GNU LGPL) which comes with this package. */ @@ -25,25 +25,45 @@ extern template class XBT_PUBLIC xbt::Extendable; namespace s4u { /** - * @rst + * @beginrst * A Link represents the network facilities between :cpp:class:`hosts `. * @endrst */ class XBT_PUBLIC Link : public xbt::Extendable { - friend kernel::resource::LinkImpl; +#ifndef DOXYGEN + friend kernel::resource::StandardLinkImpl; +#endif +protected: // Links are created from the NetZone, and destroyed by their private implementation when the simulation ends explicit Link(kernel::resource::LinkImpl* pimpl) : pimpl_(pimpl) {} virtual ~Link() = default; - // The private implementation, that never changes + // The implementation that never changes kernel::resource::LinkImpl* const pimpl_; +#ifndef DOXYGEN + friend kernel::resource::NetworkAction; // signal comm_state_changed +#endif public: - enum class SharingPolicy { WIFI = 3, SPLITDUPLEX = 2, SHARED = 1, FATPIPE = 0 }; + /** Specifies how a given link is shared between concurrent communications */ + enum class SharingPolicy { + /// This policy takes a callback that specifies the maximal capacity as a function of the number of usage. See the + /// examples with 'degradation' in their name. + NONLINEAR = 4, + /// Pseudo-sharing policy requesting wifi-specific sharing. + WIFI = 3, + /// Each link is split in 2, UP and DOWN, one per direction. These links are SHARED. + SPLITDUPLEX = 2, + /// The bandwidth is shared between all comms using that link, regardless of their direction. + SHARED = 1, + /// Each comm can use the link fully, with no sharing (only a maximum). This is intended to represent the backbone + /// links that cannot be saturated by concurrent links, but have a maximal bandwidth. + FATPIPE = 0 + }; - kernel::resource::LinkImpl* get_impl() const { return pimpl_; } + kernel::resource::StandardLinkImpl* get_impl() const; - /** @brief Retrieve a link from its name */ + /** \static @brief Retrieve a link from its name */ static Link* by_name(const std::string& name); static Link* by_name_or_null(const std::string& name); @@ -52,59 +72,201 @@ public: /** @brief Retrieves the name of that link as a C string */ const char* get_cname() const; - /** @brief Get the bandwidth in bytes per second of current Link */ + /** Get/Set the bandwidth of the current Link (in bytes per second) */ double get_bandwidth() const; - void set_bandwidth(double value); + Link* set_bandwidth(double value); - /** @brief Get the latency in seconds of current Link */ + /** Get/Set the latency of the current Link (in seconds) */ double get_latency() const; - void set_latency(double value); + /** + * @brief Set link's latency + * + * @param value New latency value (in s) + */ + Link* set_latency(double value); + /** + * @brief Set latency (string version) + * + * Accepts values with units, such as '1s' or '7ms'. + * + * Full list of accepted units: w (week), d (day), h, s, ms, us, ns, ps. + * + * @throw std::invalid_argument if latency format is incorrect. + */ + Link* set_latency(const std::string& value); - /** @brief Describes how the link is shared between flows */ + /** @brief Describes how the link is shared between flows + * + * Note that the NONLINEAR callback is in the critical path of the solver, so it should be fast. + */ + Link* set_sharing_policy(SharingPolicy policy, const NonLinearResourceCb& cb = {}); SharingPolicy get_sharing_policy() const; - /** @brief Returns the current load (in flops per second) */ - double get_usage() const; - - /** @brief Check if the Link is used (at least one flow uses the link) */ - bool is_used() const; - - void turn_on(); - bool is_on() const; - void turn_off(); - /** Setup the profile with states events (ON or OFF). The profile must contain boolean values. */ - void set_state_profile(kernel::profile::Profile* profile); + Link* set_state_profile(kernel::profile::Profile* profile); /** Setup the profile with bandwidth events (peak speed changes due to external load). * The profile must contain percentages (value between 0 and 1). */ - void set_bandwidth_profile(kernel::profile::Profile* profile); + Link* set_bandwidth_profile(kernel::profile::Profile* profile); /** Setup the profile file with latency events (peak latency changes due to external load). * The profile must contain absolute values */ - void set_latency_profile(kernel::profile::Profile* profile); + Link* set_latency_profile(kernel::profile::Profile* profile); + const std::unordered_map* get_properties() const; const char* get_property(const std::string& key) const; - void set_property(const std::string& key, const std::string& value); + Link* set_properties(const std::unordered_map& properties); + Link* set_property(const std::string& key, const std::string& value); - /* The signals */ - /** @brief Callback signal fired when a new Link is created */ - static xbt::signal on_creation; + /** + * @brief Set the number of communications that can shared this link at the same time + * + * Use this method to serialize communication flows going through this link. + * Use -1 to set no limit. + * + * @param limit Number of concurrent flows + */ + Link* set_concurrency_limit(int limit); + int get_concurrency_limit() const; - /** @brief Callback signal fired when a Link is destroyed */ - static xbt::signal on_destruction; + /** @brief Set the level of communication speed of the given host on this wifi link. + * + * The bandwidth of a wifi link for a given host depends on its SNR (signal to noise ratio), + * which ultimately depends on the distance between the host and the station and the material between them. + * + * This is modeled in SimGrid by providing several bandwidths to wifi links, one per SNR level (just provide + * comma-separated values in the XML file). By default, the first level in the list is used, but you can use the + * current function to specify that a given host uses another level of bandwidth. This can be used to take the + * location of hosts into account, or even to model mobility in your SimGrid simulation. + * + * Note that this function asserts that the link is actually a wifi link + * + * warning: in the case where a 0Mbps data rate should be used, set that rate only once during the + * experiment, and don't modify the bandwidth of that host later */ + void set_host_wifi_rate(const s4u::Host* host, int level) const; - /** @brief Callback signal fired when the state of a Link changes (when it is turned on or off) */ - static xbt::signal on_state_change; + /** @brief Returns the current load (in bytes per second) */ + double get_load() const; - /** @brief Callback signal fired when the bandwidth of a Link changes */ - static xbt::signal on_bandwidth_change; +#ifndef DOXYGEN + XBT_ATTRIB_DEPRECATED_v338("Please use get_load() instead") double get_usage() const { return get_load(); } +#endif + + /** @brief Check if the Link is used (at least one flow uses the link) */ + bool is_used() const; - /** @brief Callback signal fired when a communication starts */ - static xbt::signal on_communicate; + /** @brief Check if the Link is shared (not a FATPIPE) */ + bool is_shared() const; - /** @brief Callback signal fired when a communication changes it state (ready/done/cancel) */ + /** Turns the link on. */ + void turn_on(); + /** Turns the link off. */ + void turn_off(); + /** Checks whether the link is on. */ + bool is_on() const; + + Link* seal(); + +private: +#ifndef DOXYGEN + static xbt::signal on_creation; + static xbt::signal on_onoff; + xbt::signal on_this_onoff; + static xbt::signal on_bandwidth_change; + xbt::signal on_this_bandwidth_change; static xbt::signal on_communication_state_change; + static xbt::signal on_destruction; + xbt::signal on_this_destruction; +#endif + +public: + /* The signals */ + /** \static @brief Add a callback fired when a new Link is created */ + static void on_creation_cb(const std::function& cb) { on_creation.connect(cb); } + /** \static @brief Add a callback fired when any Link is turned on or off */ + static void on_onoff_cb(const std::function& cb) + { + on_onoff.connect(cb); + } + /** @brief Add a callback fired when this specific Link is turned on or off */ + void on_this_onoff_cb(const std::function& cb) + { + on_this_onoff.connect(cb); + } + /** \static @brief Add a callback fired when the bandwidth of any Link changes */ + static void on_bandwidth_change_cb(const std::function& cb) { on_bandwidth_change.connect(cb); } + /** @brief Add a callback fired when the bandwidth of this specific Link changes */ + void on_this_bandwidth_change_cb(const std::function& cb) + { + on_this_bandwidth_change.connect(cb); + } + /** \static @brief Add a callback fired when a communication changes it state (ready/done/cancel) */ + static void on_communication_state_change_cb( + const std::function& cb) + { + on_communication_state_change.connect(cb); + } + /** \static @brief Add a callback fired when any Link is destroyed */ + static void on_destruction_cb(const std::function& cb) { on_destruction.connect(cb); } + /** @brief Add a callback fired when this specific Link is destroyed */ + void on_this_destruction_cb(const std::function& cb) + { + on_this_destruction.connect(cb); + } + + XBT_ATTRIB_DEPRECATED_v338("Please use on_onoff_cb() instead") static void on_state_change_cb( + const std::function& cb) + { + on_onoff.connect(cb); + } +}; + +/** + * @beginrst + * A SplitDuplexLink encapsulates the :cpp:class:`links ` which + * compose a Split-Duplex link. Remember that a Split-Duplex link is nothing more than + * a pair of up/down links. + * @endrst + */ +class XBT_PUBLIC SplitDuplexLink : public Link { +public: + explicit SplitDuplexLink(kernel::resource::LinkImpl* pimpl) : Link(pimpl) {} + /** @brief Get the link direction up*/ + Link* get_link_up() const; + /** @brief Get the link direction down */ + Link* get_link_down() const; + + /** \static @brief Retrieve a link from its name */ + static SplitDuplexLink* by_name(const std::string& name); }; + +/** + * @beginrst + * Another encapsulation for using links in the :cpp:func:`NetZone::add_route` + * + * When adding a route with split-duplex links, you need to specify the direction of the link + * so SimGrid can know exactly which physical link to insert in the route. + * + * For shared/fat-pipe links, use the :cpp:enumerator:`Direction::NONE` since they don't have + * the concept of UP/DOWN links. + * @endrst + */ +class XBT_PUBLIC LinkInRoute { +public: + enum class Direction { UP = 2, DOWN = 1, NONE = 0 }; + + explicit LinkInRoute(const Link* link) : link_(link) {} + LinkInRoute(const Link* link, Direction d) : link_(link), direction_(d) {} + + /** @brief Get direction of this link in the route: UP or DOWN */ + Direction get_direction() const { return direction_; } + /** @brief Get pointer to the link */ + const Link* get_link() const { return link_; } + +private: + const Link* link_; + Direction direction_ = Direction::NONE; +}; + } // namespace s4u } // namespace simgrid