Logo AND Algorithmique Numérique Distribuée

Public GIT Repository
c3bdc57cdd7d2e20df2248bd9f6b0a1c76565296
[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/surf_interface.hpp"
9 #include "surf/surf.hpp"
10
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu_cas, surf_cpu, "Logging specific to the SURF CPU module");
12
13 /***********
14  * Options *
15  ***********/
16
17 static simgrid::config::Flag<std::string>
18     cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
19
20                   std::map<std::string, std::string>({
21                       {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
22                       {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
23                              "for the Cas01 CPU model for now)."},
24                       {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
25                   }),
26
27                   [](std::string const& val) {
28                     xbt_assert(_sg_cfg_init_status < 2,
29                                "Cannot change the optimization algorithm after the initialization");
30                   });
31
32 /*********
33  * Model *
34  *********/
35 void surf_cpu_model_init_Cas01()
36 {
37   xbt_assert(not surf_cpu_model_pm);
38   xbt_assert(not surf_cpu_model_vm);
39
40   if (cpu_optim_opt == "TI") {
41     surf_cpu_model_init_ti();
42     return;
43   }
44
45   simgrid::kernel::resource::Model::UpdateAlgo algo;
46   if (cpu_optim_opt == "Lazy")
47     algo = simgrid::kernel::resource::Model::UpdateAlgo::LAZY;
48   else
49     algo = simgrid::kernel::resource::Model::UpdateAlgo::FULL;
50
51   surf_cpu_model_pm = new simgrid::surf::CpuCas01Model(algo);
52   all_existing_models->push_back(surf_cpu_model_pm);
53
54   surf_cpu_model_vm = new simgrid::surf::CpuCas01Model(algo);
55   all_existing_models->push_back(surf_cpu_model_vm);
56 }
57
58 namespace simgrid {
59 namespace surf {
60
61 CpuCas01Model::CpuCas01Model(kernel::resource::Model::UpdateAlgo algo) : simgrid::surf::CpuModel(algo)
62 {
63   bool select = simgrid::config::get_value<bool>("cpu/maxmin-selective-update");
64
65   if (algo == Model::UpdateAlgo::LAZY) {
66     xbt_assert(select || simgrid::config::is_default("cpu/maxmin-selective-update"),
67                "You cannot disable cpu selective update when using the lazy update mechanism");
68     select = true;
69   }
70
71   set_maxmin_system(new simgrid::kernel::lmm::System(select));
72 }
73
74 CpuCas01Model::~CpuCas01Model()
75 {
76   surf_cpu_model_pm = nullptr;
77 }
78
79 Cpu* CpuCas01Model::create_cpu(simgrid::s4u::Host* host, std::vector<double>* speed_per_pstate, int core)
80 {
81   return new CpuCas01(this, host, speed_per_pstate, core);
82 }
83
84 /************
85  * Resource *
86  ************/
87 CpuCas01::CpuCas01(CpuCas01Model* model, simgrid::s4u::Host* host, std::vector<double>* speedPerPstate, int core)
88     : Cpu(model, host, model->get_maxmin_system()->constraint_new(this, core * speedPerPstate->front()), speedPerPstate,
89           core)
90 {
91 }
92
93 CpuCas01::~CpuCas01() = default;
94
95 bool CpuCas01::is_used()
96 {
97   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
98 }
99
100 /** @brief take into account changes of speed (either load or max) */
101 void CpuCas01::on_speed_change()
102 {
103   kernel::lmm::Variable* var = nullptr;
104   const kernel::lmm::Element* elem = nullptr;
105
106   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
107                                                             get_core_count() * speed_.scale * speed_.peak);
108   while ((var = get_constraint()->get_variable(&elem))) {
109     CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
110
111     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
112                                                             action->requested_core() * speed_.scale * speed_.peak);
113   }
114
115   Cpu::on_speed_change();
116 }
117
118 void CpuCas01::apply_event(tmgr_trace_event_t event, double value)
119 {
120   if (event == speed_.event) {
121     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
122     xbt_assert(get_core_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
123
124     speed_.scale = value;
125     on_speed_change();
126
127     tmgr_trace_event_unref(&speed_.event);
128   } else if (event == state_event_) {
129     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
130     xbt_assert(get_core_count() == 1, "FIXME: add state change code also for constraint_core[i]");
131
132     if (value > 0) {
133       if (is_off())
134         host_that_restart.push_back(get_host());
135       turn_on();
136     } else {
137       kernel::lmm::Constraint* cnst = get_constraint();
138       kernel::lmm::Variable* var    = nullptr;
139       const kernel::lmm::Element* elem = nullptr;
140       double date              = surf_get_clock();
141
142       turn_off();
143
144       while ((var = cnst->get_variable(&elem))) {
145         kernel::resource::Action* action = static_cast<kernel::resource::Action*>(var->get_id());
146
147         if (action->get_state() == kernel::resource::Action::State::INITED ||
148             action->get_state() == kernel::resource::Action::State::STARTED ||
149             action->get_state() == kernel::resource::Action::State::IGNORED) {
150           action->set_finish_time(date);
151           action->set_state(kernel::resource::Action::State::FAILED);
152         }
153       }
154     }
155     tmgr_trace_event_unref(&state_event_);
156
157   } else {
158     xbt_die("Unknown event!\n");
159   }
160 }
161
162 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
163 CpuAction* CpuCas01::execution_start(double size)
164 {
165   return new CpuCas01Action(get_model(), size, is_off(), speed_.scale * speed_.peak, get_constraint());
166 }
167
168 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
169 {
170   return new CpuCas01Action(get_model(), size, is_off(), speed_.scale * speed_.peak, get_constraint(), requested_cores);
171 }
172
173 CpuAction *CpuCas01::sleep(double duration)
174 {
175   if (duration > 0)
176     duration = std::max(duration, sg_surf_precision);
177
178   XBT_IN("(%s,%g)", get_cname(), duration);
179   CpuCas01Action* action = new CpuCas01Action(get_model(), 1.0, is_off(), speed_.scale * speed_.peak, get_constraint());
180
181   // FIXME: sleep variables should not consume 1.0 in System::expand()
182   action->set_max_duration(duration);
183   action->suspended_ = kernel::resource::Action::SuspendStates::sleeping;
184   if (duration < 0) // NO_MAX_DURATION
185     action->set_state(simgrid::kernel::resource::Action::State::IGNORED);
186
187   get_model()->get_maxmin_system()->update_variable_weight(action->get_variable(), 0.0);
188   if (get_model()->get_update_algorithm() == kernel::resource::Model::UpdateAlgo::LAZY) { // remove action from the heap
189     get_model()->get_action_heap().remove(action);
190     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
191     // max_duration correctly at the next call to share_resources
192     get_model()->get_modified_set()->push_front(*action);
193   }
194
195   XBT_OUT();
196   return action;
197 }
198
199 /**********
200  * Action *
201  **********/
202 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
203                                kernel::lmm::Constraint* constraint, int requested_core)
204     : CpuAction(model, cost, failed,
205                 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
206     , requested_core_(requested_core)
207 {
208   if (model->get_update_algorithm() == kernel::resource::Model::UpdateAlgo::LAZY)
209     set_last_update();
210   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
211 }
212
213 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
214                                kernel::lmm::Constraint* constraint)
215     : CpuCas01Action(model, cost, failed, speed, constraint, /* requested_core */ 1)
216 {
217 }
218
219 int CpuCas01Action::requested_core()
220 {
221   return requested_core_;
222 }
223
224 CpuCas01Action::~CpuCas01Action()=default;
225
226 }
227 }