1 /* Copyright (c) 2004-2018. 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_CPU_INTERFACE_HPP_
7 #define SURF_CPU_INTERFACE_HPP_
9 #include "simgrid/kernel/resource/Model.hpp"
10 #include "simgrid/kernel/resource/Resource.hpp"
11 #include "simgrid/s4u/Host.hpp"
12 #include "src/kernel/lmm/maxmin.hpp"
13 #include "src/surf/trace_mgr.hpp"
24 /** @ingroup SURF_cpu_interface
25 * @brief SURF cpu model interface class
26 * @details A model is an object which handle the interactions between its Resources and its Actions
28 class XBT_PUBLIC CpuModel : public kernel::resource::Model {
30 explicit CpuModel(kernel::resource::Model::UpdateAlgo algo) : Model(algo) {}
35 * @param host The host that will have this CPU
36 * @param speed_per_pstate Processor speed (in Flops) of each pstate.
37 * This ignores any potential external load coming from a trace.
38 * @param core The number of core of this Cpu
40 virtual Cpu* create_cpu(simgrid::s4u::Host* host, std::vector<double>* speed_per_pstate, int core) = 0;
42 void update_actions_state_lazy(double now, double delta) override;
43 void update_actions_state_full(double now, double delta) override;
50 /** @ingroup SURF_cpu_interface
51 * @brief SURF cpu resource interface class
52 * @details A Cpu represent a cpu associated to a host
54 class XBT_PUBLIC Cpu : public simgrid::kernel::resource::Resource {
57 * @brief Cpu constructor
59 * @param model The CpuModel associated to this Cpu
60 * @param host The host in which this Cpu should be plugged
61 * @param constraint The lmm constraint associated to this Cpu if it is part of a LMM component
62 * @param speedPerPstate Processor speed (in flop per second) for each pstate
63 * @param core The number of core of this Cpu
65 Cpu(simgrid::kernel::resource::Model * model, simgrid::s4u::Host * host, kernel::lmm::Constraint * constraint,
66 std::vector<double> * speedPerPstate, int core);
69 * @brief Cpu constructor
71 * @param model The CpuModel associated to this Cpu
72 * @param host The host in which this Cpu should be plugged
73 * @param speedPerPstate Processor speed (in flop per second) for each pstate
74 * @param core The number of core of this Cpu
76 Cpu(simgrid::kernel::resource::Model * model, simgrid::s4u::Host * host, std::vector<double> * speedPerPstate,
82 * @brief Execute some quantity of computation
84 * @param size The value of the processing amount (in flop) needed to process
85 * @return The CpuAction corresponding to the processing
87 virtual simgrid::kernel::resource::Action* execution_start(double size) = 0;
90 * @brief Execute some quantity of computation on more than one core
92 * @param size The value of the processing amount (in flop) needed to process
93 * @param requested_cores The desired amount of cores. Must be >= 1
94 * @return The CpuAction corresponding to the processing
96 virtual simgrid::kernel::resource::Action* execution_start(double size, int requested_cores) = 0;
99 * @brief Make a process sleep for duration (in seconds)
101 * @param duration The number of seconds to sleep
102 * @return The CpuAction corresponding to the sleeping
104 virtual simgrid::kernel::resource::Action* sleep(double duration) = 0;
106 /** @brief Get the amount of cores */
107 virtual int get_core_count();
109 /** @brief Get a forecast of the speed (in flops/s) if the load were as provided.
111 * The provided load should encompasses both the application's activities and the external load that come from a trace.
113 * Use a load of 1.0 to compute the amount of flops that the Cpu would deliver with one CPU-bound task.
114 * If you use a load of 0, this function will return 0: when nobody is using the Cpu, it delivers nothing.
116 * If you want to know the amount of flops currently delivered, use load = get_load()*get_speed_ratio()
118 virtual double get_speed(double load);
121 /** @brief Take speed changes (either load or max) into account */
122 virtual void on_speed_change();
125 /** @brief Get the available speed ratio, between 0 and 1.
127 * This accounts for external load (see @ref set_speed_trace()).
129 virtual double get_speed_ratio();
131 /** @brief Get the peak processor speed (in flops/s), at the specified pstate */
132 virtual double get_pstate_peak_speed(int pstate_index);
134 virtual int get_pstate_count();
135 virtual void set_pstate(int pstate_index);
136 virtual int get_pstate();
138 simgrid::s4u::Host* get_host() { return host_; }
142 simgrid::s4u::Host* host_;
144 int pstate_ = 0; /*< Current pstate (index in the speed_per_pstate_)*/
145 std::vector<double> speed_per_pstate_; /*< List of supported CPU capacities (pstate related) */
148 /*< @brief Setup the trace file with availability events (peak speed changes due to external load).
149 * Trace must contain relative values (ratio between 0 and 1)
151 virtual void set_speed_trace(tmgr_trace_t trace);
154 Metric speed_ = {1.0, 0, nullptr};
161 /** @ingroup SURF_cpu_interface
162 * @brief A CpuAction represents the execution of code on one or several Cpus
164 class XBT_PUBLIC CpuAction : public simgrid::kernel::resource::Action {
166 /** @brief Signal emitted when the action state changes (ready/running/done, etc)
167 * Signature: `void(CpuAction *action, simgrid::kernel::resource::Action::State previous)`
169 static simgrid::xbt::signal<void(simgrid::surf::CpuAction*, simgrid::kernel::resource::Action::State)> on_state_change;
170 /** @brief Signal emitted when the action share changes (amount of flops it gets)
171 * Signature: `void(CpuAction *action)`
173 static simgrid::xbt::signal<void(simgrid::surf::CpuAction*)> on_share_change;
175 CpuAction(simgrid::kernel::resource::Model * model, double cost, bool failed) : Action(model, cost, failed) {}
176 CpuAction(simgrid::kernel::resource::Model * model, double cost, bool failed, kernel::lmm::Variable* var)
177 : Action(model, cost, failed, var)
181 void set_state(simgrid::kernel::resource::Action::State state) override;
183 void update_remains_lazy(double now) override;
184 std::list<Cpu*> cpus();
186 void suspend() override;
187 void resume() override;
193 #endif /* SURF_CPU_INTERFACE_HPP_ */