1 /* Copyright (c) 2006-2016. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include "instr/instr_interface.h"
8 #include "simgrid/sg_config.h"
9 #include "simgrid/host.h"
10 #include "src/simdag/simdag_private.h"
11 #include "src/surf/surf_interface.hpp"
12 #include "simgrid/s4u/engine.hpp"
15 #include "simgrid/jedule/jedule_sd_binding.h"
18 XBT_LOG_NEW_CATEGORY(sd, "Logging specific to SimDag");
19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_kernel, sd, "Logging specific to SimDag (kernel)");
21 SD_global_t sd_global = nullptr;
24 * \brief Initializes SD internal data
26 * This function must be called before any other SD function. Then you should call SD_create_environment().
28 * \param argc argument number
29 * \param argv argument list
30 * \see SD_create_environment(), SD_exit()
32 void SD_init(int *argc, char **argv)
34 xbt_assert(sd_global == nullptr, "SD_init() already called");
36 sd_global = xbt_new(s_SD_global_t, 1);
37 sd_global->watch_point_reached = 0;
39 sd_global->task_mallocator=xbt_mallocator_new(65536, SD_task_new_f, SD_task_free_f, SD_task_recycle_f);
41 sd_global->initial_tasks = new std::set<SD_task_t>();
42 sd_global->runnable_tasks = new std::set<SD_task_t>();
43 sd_global->completed_tasks = new std::set<SD_task_t>();
44 sd_global->return_set = xbt_dynar_new(sizeof(SD_task_t), nullptr);
46 surf_init(argc, argv);
48 xbt_cfg_setdefault_string("host/model", "ptask_L07");
54 if (_sg_cfg_exit_asap) {
60 /** \brief set a configuration variable
62 * Do --help on any simgrid binary to see the list of currently existing configuration variables, and
63 * see Section @ref options.
65 * Example: SD_config("host/model","default");
67 void SD_config(const char *key, const char *value){
68 xbt_assert(sd_global,"ERROR: Please call SD_init() before using SD_config()");
69 xbt_cfg_set_as_string(key, value);
73 * \brief Creates the environment
75 * The environment (i.e. the \ref SD_host_api "hosts" and the \ref SD_link_api "links") is created with
76 * the data stored in the given XML platform file.
78 * \param platform_file name of an XML file describing the environment to create
79 * \see SD_host_api, SD_link_api
81 * The XML file follows this DTD:
83 * \include simgrid.dtd
85 * Here is a small example of such a platform:
87 * \include small_platform.xml
89 void SD_create_environment(const char *platform_file)
91 simgrid::s4u::Engine::instance()->loadPlatform(platform_file);
93 XBT_DEBUG("Workstation number: %zu, link number: %d", sg_host_count(), sg_link_count());
95 jedule_setup_platform();
97 XBT_VERB("Starting simulation...");
98 surf_presolve(); /* Takes traces into account */
102 * \brief Launches the simulation.
104 * The function will execute the \ref SD_RUNNABLE runnable tasks.
105 * If \a how_long is positive, then the simulation will be stopped either when time reaches \a how_long or when a watch
107 * A non-positive value for \a how_long means no time limit, in which case the simulation will be stopped either when a
108 * watch point is reached or when no more task can be executed.
109 * Then you can call SD_simulate() again.
111 * \param how_long maximum duration of the simulation (a negative value means no time limit)
112 * \return a dynar of \ref SD_task_t whose state has changed.
113 * \see SD_task_schedule(), SD_task_watch()
116 xbt_dynar_t SD_simulate(double how_long) {
117 /* we stop the simulation when total_time >= how_long */
120 surf_action_t action;
123 XBT_VERB("Run simulation for %f seconds", how_long);
124 sd_global->watch_point_reached = false;
126 xbt_dynar_reset(sd_global->return_set);
128 /* explore the runnable tasks */
129 while(!sd_global->runnable_tasks->empty()){
130 task = *(sd_global->runnable_tasks->begin());
131 XBT_VERB("Executing task '%s'", SD_task_get_name(task));
136 double elapsed_time = 0.0;
137 double total_time = 0.0;
138 while (elapsed_time >= 0.0 && (how_long < 0.0 || 0.00001 < (how_long -total_time)) &&
139 !sd_global->watch_point_reached) {
140 surf_model_t model = nullptr;
142 XBT_DEBUG("Total time: %f", total_time);
144 elapsed_time = surf_solve(how_long > 0 ? surf_get_clock() + how_long - total_time: -1.0);
145 XBT_DEBUG("surf_solve() returns %f", elapsed_time);
146 if (elapsed_time > 0.0)
147 total_time += elapsed_time;
149 /* let's see which tasks are done */
150 xbt_dynar_foreach(all_existing_models, iter, model) {
151 while ((action = surf_model_extract_done_action_set(model))) {
152 task = static_cast<SD_task_t>(action->getData());
153 XBT_VERB("Task '%s' done", SD_task_get_name(task));
154 SD_task_set_state(task, SD_DONE);
156 /* the state has changed. Add it only if it's the first change */
157 if (xbt_dynar_member(sd_global->return_set, &task) == 0) {
158 xbt_dynar_push(sd_global->return_set, &task);
161 /* remove the dependencies after this task */
162 for (std::set<SD_task_t>::iterator succ = task->successors->begin(); succ != task->successors->end(); ++succ){
163 (*succ)->predecessors->erase(task);
164 (*succ)->inputs->erase(task);
165 XBT_DEBUG("Release dependency on %s: %zu remain(s). Becomes schedulable if %zu=0", SD_task_get_name((*succ)),
166 (*succ)->predecessors->size()+(*succ)->inputs->size(), (*succ)->predecessors->size());
168 if (SD_task_get_state((*succ)) == SD_NOT_SCHEDULED && (*succ)->predecessors->empty())
169 SD_task_set_state((*succ), SD_SCHEDULABLE);
171 if (SD_task_get_state((*succ)) == SD_SCHEDULED && (*succ)->predecessors->empty() && (*succ)->inputs->empty())
172 SD_task_set_state((*succ), SD_RUNNABLE);
174 if (SD_task_get_state((*succ)) == SD_RUNNABLE && !sd_global->watch_point_reached) {
175 XBT_VERB("Executing task '%s'", SD_task_get_name((*succ)));
176 SD_task_run((*succ));
179 task->successors->clear();
181 for (std::set<SD_task_t>::iterator it=task->outputs->begin(); it!=task->outputs->end(); ++it){
183 dst->start_time = task->finish_time;
184 dst->predecessors->erase(task);
185 if (SD_task_get_state(dst) == SD_SCHEDULED)
186 SD_task_set_state(dst, SD_RUNNABLE);
188 SD_task_set_state(dst, SD_SCHEDULABLE);
190 SD_task_t comm_dst = *(dst->successors->begin());
191 if (SD_task_get_state(comm_dst) == SD_NOT_SCHEDULED && comm_dst->predecessors->empty()){
192 XBT_DEBUG("%s is a transfer, %s may be ready now if %zu=0",
193 SD_task_get_name(dst), SD_task_get_name(comm_dst), comm_dst->predecessors->size());
194 SD_task_set_state(comm_dst, SD_SCHEDULABLE);
196 if (SD_task_get_state(dst) == SD_RUNNABLE && !sd_global->watch_point_reached) {
197 XBT_VERB("Executing task '%s'", SD_task_get_name(dst));
201 task->outputs->clear();
204 /* let's see which tasks have just failed */
205 while ((action = surf_model_extract_failed_action_set(model))) {
206 task = static_cast<SD_task_t>(action->getData());
207 XBT_VERB("Task '%s' failed", SD_task_get_name(task));
208 SD_task_set_state(task, SD_FAILED);
209 xbt_dynar_push(sd_global->return_set, &task);
214 if (!sd_global->watch_point_reached && how_long < 0 && !sd_global->initial_tasks->empty()) {
215 XBT_WARN("Simulation is finished but %zu tasks are still not done", sd_global->initial_tasks->size());
216 static const char* state_names[] =
217 { "SD_NOT_SCHEDULED", "SD_SCHEDULABLE", "SD_SCHEDULED", "SD_RUNNABLE", "SD_RUNNING", "SD_DONE","SD_FAILED" };
218 for (std::set<SD_task_t>::iterator t = sd_global->initial_tasks->begin(); t != sd_global->initial_tasks->end();
220 XBT_WARN("%s is in %s state", SD_task_get_name(*t), state_names[SD_task_get_state(*t)]);
224 XBT_DEBUG("elapsed_time = %f, total_time = %f, watch_point_reached = %d",
225 elapsed_time, total_time, sd_global->watch_point_reached);
226 XBT_DEBUG("current time = %f", surf_get_clock());
228 return sd_global->return_set;
231 /** @brief Returns the current clock, in seconds */
232 double SD_get_clock() {
233 return surf_get_clock();
237 * \brief Destroys all SD internal data
239 * This function should be called when the simulation is over. Don't forget to destroy too.
241 * \see SD_init(), SD_task_destroy()
245 TRACE_surf_resource_utilization_release();
252 xbt_mallocator_free(sd_global->task_mallocator);
253 delete sd_global->initial_tasks;
254 delete sd_global->runnable_tasks;
255 delete sd_global->completed_tasks;
256 xbt_dynar_free_container(&(sd_global->return_set));