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"
13 #include "xbt/dynar.h"
15 #include "xbt/sysdep.h"
18 #include "simgrid/jedule/jedule_sd_binding.h"
21 XBT_LOG_NEW_CATEGORY(sd, "Logging specific to SimDag");
22 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_kernel, sd, "Logging specific to SimDag (kernel)");
24 SD_global_t sd_global = NULL;
27 * \brief Initializes SD internal data
29 * This function must be called before any other SD function. Then you should call SD_create_environment().
31 * \param argc argument number
32 * \param argv argument list
33 * \see SD_create_environment(), SD_exit()
35 void SD_init(int *argc, char **argv)
37 TRACE_global_init(argc, argv);
39 xbt_assert(sd_global == NULL, "SD_init() already called");
41 sd_global = xbt_new(s_SD_global_t, 1);
42 sd_global->watch_point_reached = 0;
44 sd_global->task_mallocator=xbt_mallocator_new(65536, SD_task_new_f, SD_task_free_f, SD_task_recycle_f);
46 sd_global->initial_task_set = xbt_dynar_new(sizeof(SD_task_t), NULL);
47 sd_global->executable_task_set = xbt_dynar_new(sizeof(SD_task_t), NULL);
48 sd_global->completed_task_set = xbt_dynar_new(sizeof(SD_task_t), NULL);
49 sd_global->return_set = xbt_dynar_new(sizeof(SD_task_t), NULL);
51 surf_init(argc, argv);
53 xbt_cfg_setdefault_string(_sg_cfg_set, "host/model",
60 if (_sg_cfg_exit_asap) {
66 /** \brief set a configuration variable
68 * Do --help on any simgrid binary to see the list of currently existing configuration variables, and
69 * see Section @ref options.
72 * SD_config("host/model","default");
74 void SD_config(const char *key, const char *value){
75 xbt_assert(sd_global,"ERROR: Please call SD_init() before using SD_config()");
76 xbt_cfg_set_as_string(_sg_cfg_set, key, value);
80 * \brief Reinits the application part of the simulation (experimental feature)
82 * This function allows you to run several simulations on the same platform
83 * by resetting the part describing the application.
85 * @warning: this function is still experimental and not perfect. For example,
86 * the simulation clock (and traces usage) is not reset. So, do not use it if
87 * you use traces in your simulation, and do not use absolute timing after
89 * That being said, this function is still precious if you want to compare a
90 * bunch of heuristics on the same platforms.
92 void SD_application_reinit(void)
94 xbt_die("This function is not working since the C++ links and others. Please report the problem if you really need that function.");
98 * \brief Creates the environment
100 * The environment (i.e. the \ref sg_host_management "hosts" and the \ref SD_link_management "links") is created with
101 * the data stored in the given XML platform file.
103 * \param platform_file name of an XML file describing the environment to create
104 * \see sg_host_management, SD_link_management
106 * The XML file follows this DTD:
108 * \include simgrid.dtd
110 * Here is a small example of such a platform:
112 * \include small_platform.xml
114 void SD_create_environment(const char *platform_file)
116 parse_platform_file(platform_file);
118 XBT_DEBUG("Workstation number: %zu, link number: %d", sg_host_count(), sg_link_count());
120 jedule_setup_platform();
122 XBT_VERB("Starting simulation...");
123 surf_presolve(); /* Takes traces into account */
127 * \brief Launches the simulation.
129 * The function will execute the \ref SD_RUNNABLE runnable tasks.
130 * If \a how_long is positive, then the simulation will be stopped either when time reaches \a how_long or when a watch
132 * A non-positive value for \a how_long means no time limit, in which case the simulation will be stopped either when a
133 * watch point is reached or when no more task can be executed.
134 * Then you can call SD_simulate() again.
136 * \param how_long maximum duration of the simulation (a negative value means no time limit)
137 * \return a dynar of \ref SD_task_t whose state has changed.
138 * \see SD_task_schedule(), SD_task_watch()
141 xbt_dynar_t SD_simulate(double how_long) {
142 /* we stop the simulation when total_time >= how_long */
143 double total_time = 0.0;
144 double elapsed_time = 0.0;
146 SD_dependency_t dependency;
147 surf_action_t action;
148 unsigned int iter, depcnt;
150 XBT_VERB("Run simulation for %f seconds", how_long);
151 sd_global->watch_point_reached = 0;
153 xbt_dynar_reset(sd_global->return_set);
155 /* explore the runnable tasks */
156 xbt_dynar_foreach(sd_global->executable_task_set , iter, task) {
157 XBT_VERB("Executing task '%s'", SD_task_get_name(task));
159 xbt_dynar_push(sd_global->return_set, &task);
165 while (elapsed_time >= 0.0 && (how_long < 0.0 || 0.00001 < (how_long -total_time)) &&
166 !sd_global->watch_point_reached) {
167 surf_model_t model = NULL;
169 XBT_DEBUG("Total time: %f", total_time);
171 elapsed_time = surf_solve(how_long > 0 ? surf_get_clock() + how_long - total_time: -1.0);
172 XBT_DEBUG("surf_solve() returns %f", elapsed_time);
173 if (elapsed_time > 0.0)
174 total_time += elapsed_time;
176 /* let's see which tasks are done */
177 xbt_dynar_foreach(all_existing_models, iter, model) {
178 while ((action = surf_model_extract_done_action_set(model))) {
179 task = (SD_task_t) action->getData();
180 task->start_time = task->surf_action->getStartTime();
182 task->finish_time = surf_get_clock();
183 XBT_VERB("Task '%s' done", SD_task_get_name(task));
184 SD_task_set_state(task, SD_DONE);
185 task->surf_action->unref();
186 task->surf_action = NULL;
188 /* the state has changed. Add it only if it's the first change */
189 if (!xbt_dynar_member(sd_global->return_set, &task)) {
190 xbt_dynar_push(sd_global->return_set, &task);
193 /* remove the dependencies after this task */
194 xbt_dynar_foreach(task->tasks_after, depcnt, dependency) {
195 dst = dependency->dst;
196 dst->unsatisfied_dependencies--;
197 if (dst->is_not_ready > 0)
200 XBT_DEBUG("Released a dependency on %s: %d remain(s). Became schedulable if %d=0",
201 SD_task_get_name(dst), dst->unsatisfied_dependencies, dst->is_not_ready);
203 if (!(dst->unsatisfied_dependencies)) {
204 if (SD_task_get_state(dst) == SD_SCHEDULED)
205 SD_task_set_state(dst, SD_RUNNABLE);
207 SD_task_set_state(dst, SD_SCHEDULABLE);
210 if (SD_task_get_state(dst) == SD_NOT_SCHEDULED && !(dst->is_not_ready)) {
211 SD_task_set_state(dst, SD_SCHEDULABLE);
214 if (SD_task_get_kind(dst) == SD_TASK_COMM_E2E) {
215 SD_dependency_t comm_dep;
217 xbt_dynar_get_cpy(dst->tasks_after, 0, &comm_dep);
218 comm_dst = comm_dep->dst;
219 if (SD_task_get_state(comm_dst) == SD_NOT_SCHEDULED && comm_dst->is_not_ready > 0) {
220 comm_dst->is_not_ready--;
222 XBT_DEBUG("%s is a transfer, %s may be ready now if %d=0",
223 SD_task_get_name(dst), SD_task_get_name(comm_dst), comm_dst->is_not_ready);
225 if (!(comm_dst->is_not_ready)) {
226 SD_task_set_state(comm_dst, SD_SCHEDULABLE);
231 /* is dst runnable now? */
232 if (SD_task_get_state(dst) == SD_RUNNABLE && !sd_global->watch_point_reached) {
233 XBT_VERB("Executing task '%s'", SD_task_get_name(dst));
235 xbt_dynar_push(sd_global->return_set, &dst);
240 /* let's see which tasks have just failed */
241 while ((action = surf_model_extract_failed_action_set(model))) {
242 task = (SD_task_t) action->getData();
243 task->start_time = surf_action_get_start_time(task->surf_action);
244 task->finish_time = surf_get_clock();
245 XBT_VERB("Task '%s' failed", SD_task_get_name(task));
246 SD_task_set_state(task, SD_FAILED);
248 task->surf_action = NULL;
250 xbt_dynar_push(sd_global->return_set, &task);
255 if (!sd_global->watch_point_reached && how_long<0){
256 if (!xbt_dynar_is_empty(sd_global->initial_task_set)) {
257 XBT_WARN("Simulation is finished but %lu tasks are still not done",
258 xbt_dynar_length(sd_global->initial_task_set));
259 static const char* state_names[] =
260 { "SD_NOT_SCHEDULED", "SD_SCHEDULABLE", "SD_SCHEDULED", "SD_RUNNABLE", "SD_RUNNING", "SD_DONE","SD_FAILED" };
261 xbt_dynar_foreach(sd_global->initial_task_set, iter, task){
262 XBT_WARN("%s is in %s state", SD_task_get_name(task), state_names[SD_task_get_state(task)]);
267 XBT_DEBUG("elapsed_time = %f, total_time = %f, watch_point_reached = %d",
268 elapsed_time, total_time, sd_global->watch_point_reached);
269 XBT_DEBUG("current time = %f", surf_get_clock());
271 return sd_global->return_set;
274 /** @brief Returns the current clock, in seconds */
275 double SD_get_clock(void) {
276 return surf_get_clock();
280 * \brief Destroys all SD internal data
282 * This function should be called when the simulation is over. Don't forget to destroy too.
284 * \see SD_init(), SD_task_destroy()
288 TRACE_surf_resource_utilization_release();
296 xbt_mallocator_free(sd_global->task_mallocator);
297 xbt_dynar_free_container(&(sd_global->initial_task_set));
298 xbt_dynar_free_container(&(sd_global->executable_task_set));
299 xbt_dynar_free_container(&(sd_global->completed_task_set));
300 xbt_dynar_free_container(&(sd_global->return_set));