1 /* Copyright (c) 2006-2021. 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 #include "simdag_private.hpp"
7 #include "simgrid/kernel/resource/Action.hpp"
8 #include "simgrid/kernel/resource/Model.hpp"
9 #include "simgrid/s4u/Engine.hpp"
10 #include "simgrid/sg_config.hpp"
11 #include "src/kernel/EngineImpl.hpp"
12 #include "src/surf/surf_interface.hpp"
16 XBT_LOG_NEW_CATEGORY(sd, "Logging specific to SimDag");
17 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_kernel, sd, "Logging specific to SimDag (kernel)");
19 std::unique_ptr<simgrid::sd::Global> sd_global = nullptr;
24 std::set<SD_task_t>* simulate(double how_long)
26 XBT_VERB("Run simulation for %f seconds", how_long);
27 auto engine = sd_global->engine_->get_impl();
28 simgrid::kernel::EngineImpl::get_instance();
29 sd_global->watch_point_reached = false;
30 sd_global->return_set.clear();
32 /* explore the runnable tasks */
33 while (not sd_global->runnable_tasks.empty())
34 SD_task_run(*(sd_global->runnable_tasks.begin()));
36 double elapsed_time = 0.0;
37 double total_time = 0.0;
39 while (elapsed_time >= 0 && (how_long < 0 || 0.00001 < (how_long - total_time)) &&
40 not sd_global->watch_point_reached) {
41 XBT_DEBUG("Total time: %f", total_time);
43 elapsed_time = engine->solve(how_long > 0 ? simgrid_get_clock() + how_long - total_time : -1.0);
44 XBT_DEBUG("solve() returns %f", elapsed_time);
45 if (elapsed_time > 0.0)
46 total_time += elapsed_time;
48 /* let's see which tasks are done */
49 for (auto const& model : engine->get_all_models()) {
50 const simgrid::kernel::resource::Action* action = model->extract_done_action();
51 while (action != nullptr && action->get_data() != nullptr) {
52 auto* task = static_cast<SD_task_t>(action->get_data());
53 XBT_VERB("Task '%s' done", SD_task_get_name(task));
54 SD_task_set_state(task, SD_DONE);
56 /* the state has changed. Add it only if it's the first change */
57 sd_global->return_set.emplace(task);
59 /* remove the dependencies after this task */
60 for (auto const& succ : *task->successors) {
61 succ->predecessors->erase(task);
62 succ->inputs->erase(task);
63 XBT_DEBUG("Release dependency on %s: %zu remain(s). Becomes schedulable if %zu=0", SD_task_get_name(succ),
64 succ->predecessors->size() + succ->inputs->size(), succ->predecessors->size());
66 if (SD_task_get_state(succ) == SD_NOT_SCHEDULED && succ->predecessors->empty())
67 SD_task_set_state(succ, SD_SCHEDULABLE);
69 if (SD_task_get_state(succ) == SD_SCHEDULED && succ->predecessors->empty() && succ->inputs->empty())
70 SD_task_set_state(succ, SD_RUNNABLE);
72 if (SD_task_get_state(succ) == SD_RUNNABLE && not sd_global->watch_point_reached)
75 task->successors->clear();
77 for (auto const& output : *task->outputs) {
78 output->start_time = task->finish_time;
79 output->predecessors->erase(task);
80 if (SD_task_get_state(output) == SD_SCHEDULED)
81 SD_task_set_state(output, SD_RUNNABLE);
83 SD_task_set_state(output, SD_SCHEDULABLE);
85 SD_task_t comm_dst = *(output->successors->begin());
86 if (SD_task_get_state(comm_dst) == SD_NOT_SCHEDULED && comm_dst->predecessors->empty()) {
87 XBT_DEBUG("%s is a transfer, %s may be ready now if %zu=0", SD_task_get_name(output),
88 SD_task_get_name(comm_dst), comm_dst->predecessors->size());
89 SD_task_set_state(comm_dst, SD_SCHEDULABLE);
91 if (SD_task_get_state(output) == SD_RUNNABLE && not sd_global->watch_point_reached)
94 task->outputs->clear();
95 action = model->extract_done_action();
98 /* let's see which tasks have just failed */
99 action = model->extract_failed_action();
100 while (action != nullptr) {
101 auto* task = static_cast<SD_task_t>(action->get_data());
102 XBT_VERB("Task '%s' failed", SD_task_get_name(task));
103 SD_task_set_state(task, SD_FAILED);
104 sd_global->return_set.insert(task);
105 action = model->extract_failed_action();
110 if (not sd_global->watch_point_reached && how_long < 0 && not sd_global->initial_tasks.empty()) {
111 XBT_WARN("Simulation is finished but %zu tasks are still not done", sd_global->initial_tasks.size());
112 for (auto const& t : sd_global->initial_tasks)
113 XBT_WARN("%s is in %s state", SD_task_get_name(t), __get_state_name(SD_task_get_state(t)));
116 XBT_DEBUG("elapsed_time = %f, total_time = %f, watch_point_reached = %d", elapsed_time, total_time,
117 sd_global->watch_point_reached);
118 XBT_DEBUG("current time = %f", simgrid_get_clock());
120 return &sd_global->return_set;
123 } // namespace simgrid
126 * @brief helper for pretty printing of task state
127 * @param state the state of a task
128 * @return the equivalent as a readable string
130 const char* __get_state_name(e_SD_task_state_t state)
132 static constexpr std::array<const char*, 7> state_names{
133 {"not scheduled", "schedulable", "scheduled", "runnable", "running", "done", "failed"}};
134 return state_names.at(static_cast<int>(log2(static_cast<double>(state))));
138 * @brief Initializes SD internal data
140 * This function must be called before any other SD function. Then you should call SD_create_environment().
142 * @param argc argument number
143 * @param argv argument list
144 * @see SD_create_environment(), SD_exit()
146 void SD_init_nocheck(int* argc, char** argv)
148 xbt_assert(sd_global == nullptr, "SD_init() already called");
150 sd_global = std::make_unique<simgrid::sd::Global>(argc, argv);
152 simgrid::config::set_default<std::string>("host/model", "ptask_L07");
153 if (simgrid::config::get_value<bool>("debug/clean-atexit"))
157 /** @brief set a configuration variable
159 * Do --help on any simgrid binary to see the list of currently existing configuration variables, and
160 * see Section @ref options.
162 * Example: SD_config("host/model","default")
164 void SD_config(const char* key, const char* value)
166 xbt_assert(sd_global, "ERROR: Please call SD_init() before using SD_config()");
167 simgrid::config::set_as_string(key, value);
171 * @brief Creates the environment
173 * The environment (i.e. the @ref SD_host_api "hosts" and the @ref SD_link_api "links") is created with
174 * the data stored in the given XML platform file.
176 * @param platform_file name of an XML file describing the environment to create
177 * @see SD_host_api, SD_link_api
179 * The XML file follows this DTD:
181 * @include simgrid.dtd
183 * Here is a small example of such a platform:
185 * @include small_platform.xml
187 void SD_create_environment(const char* platform_file)
189 sd_global->engine_->load_platform(platform_file);
191 XBT_DEBUG("Host number: %zu, link number: %zu", sg_host_count(), sg_link_count());
192 #if SIMGRID_HAVE_JEDULE
195 XBT_VERB("Starting simulation...");
196 sd_global->engine_->get_impl()->presolve(); /* Takes traces into account */
200 * @brief Launches the simulation.
202 * The function will execute the @ref SD_RUNNABLE runnable tasks.
203 * If @a how_long is positive, then the simulation will be stopped either when time reaches @a how_long or when a watch
205 * A non-positive value for @a how_long means no time limit, in which case the simulation will be stopped either when a
206 * watch point is reached or when no more task can be executed.
207 * Then you can call SD_simulate() again.
209 * @param how_long maximum duration of the simulation (a negative value means no time limit)
210 * @return a dynar of @ref SD_task_t whose state has changed.
211 * @see SD_task_schedule(), SD_task_watch()
213 void SD_simulate(double how_long)
215 simgrid::sd::simulate(how_long);
218 void SD_simulate_with_update(double how_long, xbt_dynar_t changed_tasks_dynar)
220 const std::set<SD_task_t>* changed_tasks = simgrid::sd::simulate(how_long);
221 for (auto const& task : *changed_tasks)
222 xbt_dynar_push(changed_tasks_dynar, &task);
225 /** @brief Returns the current clock, in seconds */
226 double SD_get_clock()
228 return simgrid_get_clock();
232 * @brief Destroys all SD internal data
233 * This function should be called when the simulation is over. Don't forget to destroy too.
234 * @see SD_init(), SD_task_destroy()
238 #if SIMGRID_HAVE_JEDULE
241 sd_global->engine_->shutdown();