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allow users to retrieve hosts and links by the zone in which they have been declared
[simgrid.git] / src / surf / cpu_cas01.cpp
1 /* Copyright (c) 2009-2022. The SimGrid Team. All rights reserved.          */
2
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. */
5
6 #include <simgrid/kernel/routing/NetZoneImpl.hpp>
7 #include <simgrid/s4u/Engine.hpp>
8
9 #include "simgrid/sg_config.hpp"
10 #include "src/kernel/EngineImpl.hpp"
11 #include "src/kernel/resource/profile/Event.hpp"
12 #include "src/surf/cpu_cas01.hpp"
13 #include "src/surf/cpu_ti.hpp"
14 #include "src/surf/surf_interface.hpp"
15
16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cpu_cas, res_cpu, "CPU resource, CAS01 model (used by default)");
17
18 /***********
19  * Options *
20  ***********/
21
22 static simgrid::config::Flag<std::string>
23     cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
24
25                   std::map<std::string, std::string, std::less<>>({
26                       {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
27                       {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
28                              "for the Cas01 CPU model for now)."},
29                       {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
30                   }),
31
32                   [](std::string const&) {
33                     xbt_assert(_sg_cfg_init_status < 2,
34                                "Cannot change the optimization algorithm after the initialization");
35                   });
36
37 static simgrid::config::Flag<std::string> cfg_cpu_solver("cpu/solver", "Set linear equations solver used by CPU model",
38                                                          "maxmin", &simgrid::kernel::lmm::System::validate_solver);
39
40 /*********
41  * Model *
42  *********/
43 void surf_cpu_model_init_Cas01()
44 {
45   if (cpu_optim_opt == "TI") {
46     simgrid::kernel::resource::CpuTiModel::create_pm_models();
47     return;
48   }
49
50   auto cpu_model_pm = std::make_shared<simgrid::kernel::resource::CpuCas01Model>("Cpu_Cas01");
51   auto* engine      = simgrid::kernel::EngineImpl::get_instance();
52   engine->add_model(cpu_model_pm);
53   engine->get_netzone_root()->set_cpu_pm_model(cpu_model_pm);
54 }
55
56 namespace simgrid {
57 namespace kernel {
58 namespace resource {
59
60 CpuCas01Model::CpuCas01Model(const std::string& name) : CpuModel(name)
61 {
62   if (config::get_value<std::string>("cpu/optim") == "Lazy")
63     set_update_algorithm(Model::UpdateAlgo::LAZY);
64
65   bool select = config::get_value<bool>("cpu/maxmin-selective-update");
66
67   if (is_update_lazy()) {
68     xbt_assert(select || config::is_default("cpu/maxmin-selective-update"),
69                "You cannot disable cpu selective update when using the lazy update mechanism");
70     select = true;
71   }
72
73   set_maxmin_system(lmm::System::build(cfg_cpu_solver, select));
74 }
75
76 CpuImpl* CpuCas01Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
77 {
78   return (new CpuCas01(host, speed_per_pstate))->set_model(this);
79 }
80
81 /************
82  * Resource *
83  ************/
84 /** @brief take into account changes of speed (either load or max) */
85 void CpuCas01::on_speed_change()
86 {
87   const lmm::Element* elem = nullptr;
88
89   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
90                                                             get_core_count() * speed_.scale * speed_.peak);
91
92   while (const auto* var = get_constraint()->get_variable(&elem)) {
93     const auto* action = static_cast<CpuCas01Action*>(var->get_id());
94     double bound       = action->requested_core() * speed_.scale * speed_.peak;
95     if (action->get_user_bound() > 0) {
96       bound = std::min(bound, action->get_user_bound());
97     }
98
99     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), bound);
100   }
101
102   CpuImpl::on_speed_change();
103 }
104
105 void CpuCas01::apply_event(profile::Event* event, double value)
106 {
107   if (event == speed_.event) {
108     speed_.scale = value;
109     on_speed_change();
110
111     tmgr_trace_event_unref(&speed_.event);
112   } else if (event == get_state_event()) {
113     if (value > 0) {
114       if (not is_on()) {
115         XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
116         get_iface()->turn_on();
117       }
118     } else {
119       const lmm::Element* elem = nullptr;
120       double date              = EngineImpl::get_clock();
121
122       get_iface()->turn_off();
123
124       while (const auto* var = get_constraint()->get_variable(&elem)) {
125         Action* action = var->get_id();
126
127         if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED ||
128             action->get_state() == Action::State::IGNORED) {
129           action->set_finish_time(date);
130           action->set_state(Action::State::FAILED);
131         }
132       }
133     }
134     unref_state_event();
135
136   } else {
137     xbt_die("Unknown event!\n");
138   }
139 }
140
141 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
142 CpuAction* CpuCas01::execution_start(double size, double user_bound)
143 {
144   return execution_start(size, 1, user_bound);
145 }
146
147 CpuAction* CpuCas01::execution_start(double size, int requested_cores, double user_bound)
148 {
149   auto* action =
150       new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint(), requested_cores);
151   action->set_user_bound(user_bound);
152   if (user_bound > 0 && user_bound < action->get_bound()) {
153     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), user_bound);
154   }
155   if (factor_cb_) {
156     action->set_rate_factor(factor_cb_(size));
157   }
158
159   return action;
160 }
161
162 CpuAction* CpuCas01::sleep(double duration)
163 {
164   if (duration > 0)
165     duration = std::max(duration, sg_surf_precision);
166
167   XBT_IN("(%s, %g)", get_cname(), duration);
168   auto* action = new CpuCas01Action(get_model(), 1.0, not is_on(), speed_.scale * speed_.peak, get_constraint(), 1);
169
170   // FIXME: sleep variables should not consume 1.0 in System::expand()
171   action->set_max_duration(duration);
172   action->set_suspend_state(Action::SuspendStates::SLEEPING);
173   if (duration == NO_MAX_DURATION)
174     action->set_state(Action::State::IGNORED);
175
176   get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
177   if (get_model()->is_update_lazy()) { // remove action from the heap
178     get_model()->get_action_heap().remove(action);
179     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
180     // max_duration correctly at the next call to share_resources
181     get_model()->get_modified_set()->push_front(*action);
182   }
183
184   XBT_OUT();
185   return action;
186 }
187
188 void CpuCas01::set_factor_cb(const std::function<s4u::Host::CpuFactorCb>& cb)
189 {
190   xbt_assert(not is_sealed(), "Cannot set CPU factor callback in an already sealed CPU(%s)", get_cname());
191   factor_cb_ = cb;
192 }
193
194 /**********
195  * Action *
196  **********/
197 CpuCas01Action::CpuCas01Action(Model* model, double cost, bool failed, double speed, lmm::Constraint* constraint,
198                                int requested_core)
199     : CpuAction(model, cost, failed,
200                 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
201     , requested_core_(requested_core)
202 {
203   if (model->is_update_lazy())
204     set_last_update();
205   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
206 }
207
208 } // namespace resource
209 } // namespace kernel
210 } // namespace simgrid