Logo AND Algorithmique Numérique Distribuée

Public GIT Repository
various tiny changes
[simgrid.git] / src / simdag / sd_global.cpp
1 /* Copyright (c) 2006-2016. The SimGrid Team.
2  * All rights reserved.                                                     */
3
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. */
6
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"
13
14 #if HAVE_JEDULE
15 #include "simgrid/jedule/jedule_sd_binding.h"
16 #endif
17
18 XBT_LOG_NEW_CATEGORY(sd, "Logging specific to SimDag");
19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_kernel, sd, "Logging specific to SimDag (kernel)");
20
21 SD_global_t sd_global = nullptr;
22
23 /**
24  * \brief Initializes SD internal data
25  *
26  * This function must be called before any other SD function. Then you should call SD_create_environment().
27  *
28  * \param argc argument number
29  * \param argv argument list
30  * \see SD_create_environment(), SD_exit()
31  */
32 void SD_init(int *argc, char **argv)
33 {
34   xbt_assert(sd_global == nullptr, "SD_init() already called");
35
36   sd_global = xbt_new(s_SD_global_t, 1);
37   sd_global->watch_point_reached = 0;
38
39   sd_global->task_mallocator=xbt_mallocator_new(65536, SD_task_new_f, SD_task_free_f, SD_task_recycle_f);
40
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);
45
46   surf_init(argc, argv);
47
48   xbt_cfg_setdefault_string("host/model", "ptask_L07");
49
50 #if HAVE_JEDULE
51   jedule_sd_init();
52 #endif
53
54   if (_sg_cfg_exit_asap) {
55     SD_exit();
56     exit(0);
57   }
58 }
59
60 /** \brief set a configuration variable
61  *
62  * Do --help on any simgrid binary to see the list of currently existing configuration variables, and
63  * see Section @ref options.
64  *
65  * Example: SD_config("host/model","default");
66  */
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);
70 }
71
72 /**
73  * \brief Creates the environment
74  *
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.
77  *
78  * \param platform_file name of an XML file describing the environment to create
79  * \see SD_host_api, SD_link_api
80  *
81  * The XML file follows this DTD:
82  *
83  *     \include simgrid.dtd
84  *
85  * Here is a small example of such a platform:
86  *
87  *     \include small_platform.xml
88  */
89 void SD_create_environment(const char *platform_file)
90 {
91   simgrid::s4u::Engine::instance()->loadPlatform(platform_file);
92
93   XBT_DEBUG("Workstation number: %zu, link number: %d", sg_host_count(), sg_link_count());
94 #if HAVE_JEDULE
95   jedule_setup_platform();
96 #endif
97   XBT_VERB("Starting simulation...");
98   surf_presolve();            /* Takes traces into account */
99 }
100
101 /**
102  * \brief Launches the simulation.
103  *
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
106  * point is reached.
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.
110  *
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()
114  */
115
116 xbt_dynar_t SD_simulate(double how_long) {
117   /* we stop the simulation when total_time >= how_long */
118   SD_task_t task;
119   SD_task_t dst;
120   surf_action_t action;
121   unsigned int iter;
122
123   XBT_VERB("Run simulation for %f seconds", how_long);
124   sd_global->watch_point_reached = false;
125
126   xbt_dynar_reset(sd_global->return_set);
127
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));
132     SD_task_run(task);
133   }
134
135   /* main loop */
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;
141
142     XBT_DEBUG("Total time: %f", total_time);
143
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;
148
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);
155
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);
159         }
160
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());
167
168           if (SD_task_get_state((*succ)) == SD_NOT_SCHEDULED && (*succ)->predecessors->empty())
169             SD_task_set_state((*succ), SD_SCHEDULABLE);
170
171           if (SD_task_get_state((*succ)) == SD_SCHEDULED && (*succ)->predecessors->empty() && (*succ)->inputs->empty())
172             SD_task_set_state((*succ), SD_RUNNABLE);
173
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));
177           }
178         }
179         task->successors->clear();
180
181         for (std::set<SD_task_t>::iterator it=task->outputs->begin(); it!=task->outputs->end(); ++it){
182           dst=*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);
187           else
188              SD_task_set_state(dst, SD_SCHEDULABLE);
189
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);
195           }
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));
198             SD_task_run(dst);
199           }
200         }
201         task->outputs->clear();
202       }
203
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);
210       }
211     }
212   }
213
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();
219          ++t){
220       XBT_WARN("%s is in %s state", SD_task_get_name(*t), state_names[SD_task_get_state(*t)]);
221     }
222   }
223
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());
227
228   return sd_global->return_set;
229 }
230
231 /** @brief Returns the current clock, in seconds */
232 double SD_get_clock() {
233   return surf_get_clock();
234 }
235
236 /**
237  * \brief Destroys all SD internal data
238  *
239  * This function should be called when the simulation is over. Don't forget to destroy too.
240  *
241  * \see SD_init(), SD_task_destroy()
242  */
243 void SD_exit()
244 {
245   TRACE_surf_resource_utilization_release();
246
247 #if HAVE_JEDULE
248   jedule_sd_cleanup();
249   jedule_sd_exit();
250 #endif
251
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));
257   xbt_free(sd_global);
258   sd_global = nullptr;
259 }