1 /* Copyright (c) 2006-2023. 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 #ifndef SIMGRID_S4U_HOST_HPP
7 #define SIMGRID_S4U_HOST_HPP
9 #include <simgrid/forward.h>
10 #include <simgrid/kernel/resource/Action.hpp>
11 #include <xbt/Extendable.hpp>
12 #include <xbt/signal.hpp>
15 #include <unordered_map>
19 extern template class XBT_PUBLIC xbt::Extendable<s4u::Host>;
26 * Some physical resource with computing and networking capabilities on which Actors execute.
29 * All hosts are automatically created during the call of the method
30 * :cpp:func:`simgrid::s4u::Engine::load_platform()`.
31 * You cannot create a host yourself.
33 * You can retrieve a particular host using :cpp:func:`simgrid::s4u::Host::by_name()`
34 * and actors can retrieve the host on which they run using :cpp:func:`simgrid::s4u::Host::current()` or
35 * :cpp:func:`simgrid::s4u::this_actor::get_host()`
38 class XBT_PUBLIC Host : public xbt::Extendable<Host> {
40 friend kernel::resource::VMModel; // Use the pimpl_cpu to compute the VM sharing
41 friend kernel::resource::VirtualMachineImpl; // creates the the pimpl_cpu
42 friend kernel::routing::NetZoneImpl;
43 friend kernel::resource::HostImpl; // call destructor from private implementation
45 // The private implementation, that never changes
46 kernel::resource::HostImpl* const pimpl_;
48 kernel::resource::CpuImpl* pimpl_cpu_ = nullptr;
49 kernel::routing::NetPoint* pimpl_netpoint_ = nullptr;
51 friend kernel::resource::CpuAction; // signal exec_state_changed
55 explicit Host(kernel::resource::HostImpl* pimpl) : pimpl_(pimpl) {}
58 virtual ~Host(); // Call destroy() instead of manually deleting it.
59 Host* set_netpoint(kernel::routing::NetPoint* netpoint);
61 static xbt::signal<void(Host&)> on_creation;
62 static xbt::signal<void(Host const&)> on_destruction;
63 xbt::signal<void(Host const&)> on_this_destruction;
64 static xbt::signal<void(kernel::resource::CpuAction&, kernel::resource::Action::State)> on_exec_state_change;
67 static xbt::signal<void(Host const&)> on_speed_change;
68 xbt::signal<void(Host const&)> on_this_speed_change;
69 static xbt::signal<void(Host const&)> on_state_change;
70 xbt::signal<void(Host const&)> on_this_state_change;
73 /** Add a callback fired on each newly created host */
74 static void on_creation_cb(const std::function<void(Host&)>& cb) { on_creation.connect(cb); }
75 /** Add a callback fired when any machine is turned on or off (called AFTER the change) */
76 static void on_state_change_cb(const std::function<void(Host const&)>& cb) { on_state_change.connect(cb); }
77 /** Add a callback fired when this specific machine is turned on or off (called AFTER the change) */
78 void on_this_state_change_cb(const std::function<void(Host const&)>& cb)
80 on_this_state_change.connect(cb);
82 /** Add a callback fired when the speed of any machine is changed (called AFTER the change)
83 * (either because of a pstate switch or because of an external load event coming from the profile) */
84 static void on_speed_change_cb(const std::function<void(Host const&)>& cb) { on_speed_change.connect(cb); }
85 /** Add a callback fired when the speed of this specific machine is changed (called AFTER the change)
86 * (either because of a pstate switch or because of an external load event coming from the profile) */
87 void on_this_speed_change_cb(const std::function<void(Host const&)>& cb)
89 on_this_speed_change.connect(cb);
91 /** Add a callback fired just before destructing any host */
92 static void on_destruction_cb(const std::function<void(Host const&)>& cb) { on_destruction.connect(cb); }
93 /** Add a callback fired just before destructing this specific host */
94 void on_this_destruction_cb(const std::function<void(Host const&)>& cb)
96 on_this_destruction.connect(cb);
98 /** Add a callback fired when the state of any exec activity changes */
99 static void on_exec_state_change_cb(
100 const std::function<void(kernel::resource::CpuAction&, kernel::resource::Action::State previous)>& cb)
102 on_exec_state_change.connect(cb);
105 virtual void destroy();
108 Host(Host const&) = delete;
109 Host& operator=(Host const&) = delete;
112 /** Retrieve a host from its name, or return nullptr */
113 static Host* by_name_or_null(const std::string& name);
114 /** Retrieve a host from its name, or die */
115 static Host* by_name(const std::string& name);
116 /** Retrieves the host on which the running actor is located */
117 static Host* current();
119 /** Retrieves the name of that host as a C++ string */
120 std::string const& get_name() const;
121 /** Retrieves the name of that host as a C string */
122 const char* get_cname() const;
124 Host* set_cpu(kernel::resource::CpuImpl* cpu);
125 kernel::resource::CpuImpl* get_cpu() const { return pimpl_cpu_; }
126 kernel::routing::NetPoint* get_netpoint() const { return pimpl_netpoint_; }
128 * @brief Callback to set CPU factor
130 * This callback offers a flexible way to create variability in CPU executions
132 * @param flops Execution size in flops
133 * @return Multiply factor
135 using CpuFactorCb = double(double flops);
137 * @brief Configure the factor callback to the CPU associated to this host
139 Host* set_factor_cb(const std::function<CpuFactorCb>& cb);
141 size_t get_actor_count() const;
142 std::vector<ActorPtr> get_all_actors() const;
144 /** Turns that host on if it was previously off
146 * This call does nothing if the host is already on. If it was off, all actors which were marked 'autorestart' on that
147 * host will be restarted automatically (note that this may differ from the actors that were initially running on the
150 * All other Host's properties are left unchanged; in particular, the pstate is left unchanged and not reset to its
154 /** Turns that host off. All actors are forcefully stopped. */
156 /** Returns if that host is currently up and running */
159 const char* get_property(const std::string& key) const;
160 Host* set_property(const std::string& key, const std::string& value);
161 const std::unordered_map<std::string, std::string>* get_properties() const;
162 Host* set_properties(const std::unordered_map<std::string, std::string>& properties);
164 Host* set_state_profile(kernel::profile::Profile* p);
165 Host* set_speed_profile(kernel::profile::Profile* p);
168 * @brief Set the max amount of executions that can take place on this host at the same time
170 * Use -1 to set no limit.
172 Host* set_concurrency_limit(int limit);
173 int get_concurrency_limit() const;
175 /** @brief Convert the CPU's speed from string to double */
176 static std::vector<double> convert_pstate_speed_vector(const std::vector<std::string>& speed_per_state);
178 * @brief Set the CPU's speed
180 * @param speed_per_state list of powers for this processor (default power is at index 0)
182 Host* set_pstate_speed(const std::vector<double>& speed_per_state);
184 * @brief Set the CPU's speed (string version)
186 * @throw std::invalid_argument if speed format is incorrect.
188 Host* set_pstate_speed(const std::vector<std::string>& speed_per_state);
190 /** @brief Get the peak computing speed in flops/s at the current pstate, NOT taking the external load into account.
192 * The amount of flops per second available for computing depends on several things:
193 * - The current pstate determines the maximal peak computing speed (use
194 * @verbatim embed:rst:inline :cpp:func:`get_pstate_speed() <simgrid::s4u::Host::get_pstate_speed>` @endverbatim
195 * to retrieve the computing speed you would get at another pstate)
196 * - If you declared an external load (with
197 * @verbatim embed:rst:inline :cpp:func:`set_speed_profile() <simgrid::s4u::Host::set_speed_profile>` @endverbatim ),
198 * you must multiply the result of
199 * @verbatim embed:rst:inline :cpp:func:`get_speed() <simgrid::s4u::Host::get_speed>` @endverbatim by
200 * @verbatim embed:rst:inline :cpp:func:`get_available_speed() <simgrid::s4u::Host::get_available_speed>` @endverbatim
201 * to retrieve what a new computation would get.
203 * The remaining speed is then shared between the executions located on this host.
204 * You can retrieve the amount of tasks currently running on this host with
205 * @verbatim embed:rst:inline :cpp:func:`get_load() <simgrid::s4u::Host::get_load>` @endverbatim .
207 * The host may have multiple cores, and your executions may be able to use more than a single core.
209 * Finally, executions of priority 2 get twice the amount of flops than executions of priority 1.
211 double get_speed() const;
212 /** @brief Get the available speed ratio, between 0 and 1.
214 * This accounts for external load (see
215 * @verbatim embed:rst:inline :cpp:func:`set_speed_profile() <simgrid::s4u::Host::set_speed_profile>` @endverbatim ).
217 double get_available_speed() const;
219 /** Returns the number of core of the processor. */
220 int get_core_count() const;
221 Host* set_core_count(int core_count);
223 enum class SharingPolicy { NONLINEAR = 1, LINEAR = 0 };
225 * @brief Describes how the CPU is shared between concurrent tasks
227 * Note that the NONLINEAR callback is in the critical path of the solver, so it should be fast.
229 * @param policy Sharing policy
230 * @param cb Callback for NONLINEAR policies
232 Host* set_sharing_policy(SharingPolicy policy, const s4u::NonLinearResourceCb& cb = {});
233 SharingPolicy get_sharing_policy() const;
235 /** Returns the current computation load (in flops per second)
237 * The external load (coming from an availability trace) is not taken in account.
238 * You may also be interested in the load plugin.
240 double get_load() const;
242 unsigned long get_pstate_count() const;
243 unsigned long get_pstate() const;
244 double get_pstate_speed(unsigned long pstate_index) const;
245 Host* set_pstate(unsigned long pstate_index);
246 Host* set_coordinates(const std::string& coords);
248 std::vector<Disk*> get_disks() const;
250 * @brief Create and add disk in the host
252 * @param name Disk name
253 * @param read_bandwidth Reading speed of the disk
254 * @param write_bandwidth Writing speed of the disk
256 Disk* create_disk(const std::string& name, double read_bandwidth, double write_bandwidth);
258 * @brief Human-friendly version of create_disk function.
260 * @throw std::invalid_argument if read/write speeds are incorrect
262 Disk* create_disk(const std::string& name, const std::string& read_bandwidth, const std::string& write_bandwidth);
263 void add_disk(const Disk* disk);
264 void remove_disk(const std::string& disk_name);
266 VirtualMachine* create_vm(const std::string& name, int core_amount);
267 VirtualMachine* create_vm(const std::string& name, int core_amount, size_t ramsize);
268 /** Retrieve a VM running on this host from its name, or return nullptr */
269 VirtualMachine* vm_by_name_or_null(const std::string& name);
271 void route_to(const Host* dest, std::vector<Link*>& links, double* latency) const;
272 void route_to(const Host* dest, std::vector<kernel::resource::StandardLinkImpl*>& links, double* latency) const;
273 std::pair<std::vector<Link*>, double> route_to(const Host* dest) const;
276 * @brief Seal this host
277 * No more configuration is allowed after the seal
281 NetZone* get_englobing_zone() const;
282 /** Block the calling actor on an execution located on the called host
284 * It is not a problem if the actor is not located on the called host.
285 * The actor will not be migrated in this case. Such remote execution are easy in simulation.
287 void execute(double flops) const;
288 /** Start an asynchronous computation on that host (possibly remote) */
289 ExecPtr exec_init(double flops_amounts) const;
290 ExecPtr exec_async(double flops_amounts) const;
292 /** Block the calling actor on an execution located on the called host (with explicit priority) */
293 void execute(double flops, double priority) const;
294 kernel::resource::HostImpl* get_impl() const { return pimpl_; }
297 } // namespace simgrid
299 #endif /* SIMGRID_S4U_HOST_HPP */