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cosmetics around CpuTiModel
[simgrid.git] / src / surf / cpu_cas01.cpp
1 /* Copyright (c) 2009-2018. 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 "cpu_cas01.hpp"
7 #include "simgrid/sg_config.hpp"
8 #include "src/surf/cpu_ti.hpp"
9 #include "src/surf/surf_interface.hpp"
10 #include "surf/surf.hpp"
11
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu_cas, surf_cpu, "Logging specific to the SURF CPU module");
13
14 /***********
15  * Options *
16  ***********/
17
18 static simgrid::config::Flag<std::string>
19     cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
20
21                   std::map<std::string, std::string>({
22                       {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
23                       {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
24                              "for the Cas01 CPU model for now)."},
25                       {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
26                   }),
27
28                   [](std::string const& val) {
29                     xbt_assert(_sg_cfg_init_status < 2,
30                                "Cannot change the optimization algorithm after the initialization");
31                   });
32
33 /*********
34  * Model *
35  *********/
36 void surf_cpu_model_init_Cas01()
37 {
38   xbt_assert(surf_cpu_model_pm == nullptr, "CPU model already initialized. This should not happen.");
39   xbt_assert(surf_cpu_model_vm == nullptr, "CPU model already initialized. This should not happen.");
40
41   if (cpu_optim_opt == "TI") {
42     simgrid::surf::CpuTiModel::create_pm_vm_models();
43     return;
44   }
45
46   simgrid::kernel::resource::Model::UpdateAlgo algo;
47   if (cpu_optim_opt == "Lazy")
48     algo = simgrid::kernel::resource::Model::UpdateAlgo::LAZY;
49   else
50     algo = simgrid::kernel::resource::Model::UpdateAlgo::FULL;
51
52   surf_cpu_model_pm = new simgrid::surf::CpuCas01Model(algo);
53   all_existing_models->push_back(surf_cpu_model_pm);
54
55   surf_cpu_model_vm = new simgrid::surf::CpuCas01Model(algo);
56   all_existing_models->push_back(surf_cpu_model_vm);
57 }
58
59 namespace simgrid {
60 namespace surf {
61
62 CpuCas01Model::CpuCas01Model(kernel::resource::Model::UpdateAlgo algo) : simgrid::surf::CpuModel(algo)
63 {
64   bool select = simgrid::config::get_value<bool>("cpu/maxmin-selective-update");
65
66   if (algo == Model::UpdateAlgo::LAZY) {
67     xbt_assert(select || simgrid::config::is_default("cpu/maxmin-selective-update"),
68                "You cannot disable cpu selective update when using the lazy update mechanism");
69     select = true;
70   }
71
72   set_maxmin_system(new simgrid::kernel::lmm::System(select));
73 }
74
75 CpuCas01Model::~CpuCas01Model()
76 {
77   surf_cpu_model_pm = nullptr;
78 }
79
80 Cpu* CpuCas01Model::create_cpu(simgrid::s4u::Host* host, std::vector<double>* speed_per_pstate, int core)
81 {
82   return new CpuCas01(this, host, speed_per_pstate, core);
83 }
84
85 /************
86  * Resource *
87  ************/
88 CpuCas01::CpuCas01(CpuCas01Model* model, simgrid::s4u::Host* host, std::vector<double>* speedPerPstate, int core)
89     : Cpu(model, host, model->get_maxmin_system()->constraint_new(this, core * speedPerPstate->front()), speedPerPstate,
90           core)
91 {
92 }
93
94 CpuCas01::~CpuCas01() = default;
95
96 bool CpuCas01::is_used()
97 {
98   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
99 }
100
101 /** @brief take into account changes of speed (either load or max) */
102 void CpuCas01::on_speed_change()
103 {
104   kernel::lmm::Variable* var = nullptr;
105   const kernel::lmm::Element* elem = nullptr;
106
107   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
108                                                             get_core_count() * speed_.scale * speed_.peak);
109   while ((var = get_constraint()->get_variable(&elem))) {
110     CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
111
112     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
113                                                             action->requested_core() * speed_.scale * speed_.peak);
114   }
115
116   Cpu::on_speed_change();
117 }
118
119 void CpuCas01::apply_event(tmgr_trace_event_t event, double value)
120 {
121   if (event == speed_.event) {
122     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
123     xbt_assert(get_core_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
124
125     speed_.scale = value;
126     on_speed_change();
127
128     tmgr_trace_event_unref(&speed_.event);
129   } else if (event == state_event_) {
130     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
131     xbt_assert(get_core_count() == 1, "FIXME: add state change code also for constraint_core[i]");
132
133     if (value > 0) {
134       if (is_off())
135         host_that_restart.push_back(get_host());
136       turn_on();
137     } else {
138       kernel::lmm::Constraint* cnst = get_constraint();
139       kernel::lmm::Variable* var    = nullptr;
140       const kernel::lmm::Element* elem = nullptr;
141       double date              = surf_get_clock();
142
143       turn_off();
144
145       while ((var = cnst->get_variable(&elem))) {
146         kernel::resource::Action* action = static_cast<kernel::resource::Action*>(var->get_id());
147
148         if (action->get_state() == kernel::resource::Action::State::INITED ||
149             action->get_state() == kernel::resource::Action::State::STARTED ||
150             action->get_state() == kernel::resource::Action::State::IGNORED) {
151           action->set_finish_time(date);
152           action->set_state(kernel::resource::Action::State::FAILED);
153         }
154       }
155     }
156     tmgr_trace_event_unref(&state_event_);
157
158   } else {
159     xbt_die("Unknown event!\n");
160   }
161 }
162
163 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
164 CpuAction* CpuCas01::execution_start(double size)
165 {
166   return new CpuCas01Action(get_model(), size, is_off(), speed_.scale * speed_.peak, get_constraint());
167 }
168
169 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
170 {
171   return new CpuCas01Action(get_model(), size, is_off(), speed_.scale * speed_.peak, get_constraint(), requested_cores);
172 }
173
174 CpuAction *CpuCas01::sleep(double duration)
175 {
176   if (duration > 0)
177     duration = std::max(duration, sg_surf_precision);
178
179   XBT_IN("(%s,%g)", get_cname(), duration);
180   CpuCas01Action* action = new CpuCas01Action(get_model(), 1.0, is_off(), speed_.scale * speed_.peak, get_constraint());
181
182   // FIXME: sleep variables should not consume 1.0 in System::expand()
183   action->set_max_duration(duration);
184   action->suspended_ = kernel::resource::Action::SuspendStates::sleeping;
185   if (duration < 0) // NO_MAX_DURATION
186     action->set_state(simgrid::kernel::resource::Action::State::IGNORED);
187
188   get_model()->get_maxmin_system()->update_variable_weight(action->get_variable(), 0.0);
189   if (get_model()->get_update_algorithm() == kernel::resource::Model::UpdateAlgo::LAZY) { // remove action from the heap
190     get_model()->get_action_heap().remove(action);
191     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
192     // max_duration correctly at the next call to share_resources
193     get_model()->get_modified_set()->push_front(*action);
194   }
195
196   XBT_OUT();
197   return action;
198 }
199
200 /**********
201  * Action *
202  **********/
203 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
204                                kernel::lmm::Constraint* constraint, int requested_core)
205     : CpuAction(model, cost, failed,
206                 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
207     , requested_core_(requested_core)
208 {
209   if (model->get_update_algorithm() == kernel::resource::Model::UpdateAlgo::LAZY)
210     set_last_update();
211   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
212 }
213
214 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
215                                kernel::lmm::Constraint* constraint)
216     : CpuCas01Action(model, cost, failed, speed, constraint, /* requested_core */ 1)
217 {
218 }
219
220 int CpuCas01Action::requested_core()
221 {
222   return requested_core_;
223 }
224
225 CpuCas01Action::~CpuCas01Action()=default;
226
227 }
228 }