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further cleaning in this rotten realm
[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 "src/surf/surf_interface.hpp"
8 #include "src/simdag/simdag_private.h"
9 #include "instr/instr_interface.h"
10 #include "xbt/sysdep.h"
11 #include "xbt/dynar.h"
12 #include "surf/surf.h"
13 #include "simgrid/sg_config.h"
14 #include "simgrid/host.h"
15 #include "xbt/ex.h"
16 #include "xbt/log.h"
17 #include "xbt/str.h"
18 #include "xbt/config.h"
19 #include "surf/surfxml_parse.h"
20 #ifdef HAVE_LUA
21 #include <lua.h>
22 #include <lauxlib.h>
23 #include <lualib.h>
24 #endif
25
26 #ifdef HAVE_JEDULE
27 #include "simgrid/jedule/jedule_sd_binding.h"
28 #endif
29
30 XBT_LOG_NEW_CATEGORY(sd, "Logging specific to SimDag");
31 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_kernel, sd,
32                                 "Logging specific to SimDag (kernel)");
33
34 SD_global_t sd_global = NULL;
35
36 /**
37  * \brief Initializes SD internal data
38  *
39  * This function must be called before any other SD function. Then you
40  * should call SD_create_environment().
41  *
42  * \param argc argument number
43  * \param argv argument list
44  * \see SD_create_environment(), SD_exit()
45  */
46 void SD_init(int *argc, char **argv)
47 {
48   TRACE_global_init(argc, argv);
49
50   xbt_assert(sd_global == NULL, "SD_init() already called");
51
52   sd_global = xbt_new(s_SD_global_t, 1);
53   sd_global->watch_point_reached = 0;
54
55   sd_global->task_mallocator=xbt_mallocator_new(65536, SD_task_new_f,
56                                                 SD_task_free_f,
57                                                 SD_task_recycle_f);
58
59   sd_global->initial_task_set = xbt_dynar_new(sizeof(SD_task_t), NULL);
60   sd_global->executable_task_set = xbt_dynar_new(sizeof(SD_task_t), NULL);
61   sd_global->completed_task_set = xbt_dynar_new(sizeof(SD_task_t), NULL);
62   sd_global->return_set = xbt_dynar_new(sizeof(SD_task_t), NULL);
63
64   sd_global->task_number = 0;
65
66   surf_init(argc, argv);
67
68   xbt_cfg_setdefault_string(_sg_cfg_set, "host/model",
69                             "ptask_L07");
70
71 #ifdef HAVE_JEDULE
72   jedule_sd_init();
73 #endif
74
75   XBT_DEBUG("ADD SD LEVELS");
76   SD_STORAGE_LEVEL = xbt_lib_add_level(storage_lib,__SD_storage_destroy);
77
78   if (_sg_cfg_exit_asap) {
79     SD_exit();
80     exit(0);
81   }
82 }
83
84 /** \brief set a configuration variable
85  *
86  * Do --help on any simgrid binary to see the list of currently existing
87  * configuration variables, and see Section @ref options.
88  *
89  * Example:
90  * SD_config("host/model","default");
91  */
92 void SD_config(const char *key, const char *value){
93   xbt_assert(sd_global,"ERROR: Please call SD_init() before using SD_config()");
94   xbt_cfg_set_as_string(_sg_cfg_set, key, value);
95 }
96
97 /**
98  * \brief Reinits the application part of the simulation (experimental feature)
99  *
100  * This function allows you to run several simulations on the same platform
101  * by resetting the part describing the application.
102  *
103  * @warning: this function is still experimental and not perfect. For example,
104  * the simulation clock (and traces usage) is not reset. So, do not use it if
105  * you use traces in your simulation, and do not use absolute timing after
106  * using it.
107  * That being said, this function is still precious if you want to compare a
108  * bunch of heuristics on the same platforms.
109  */
110 void SD_application_reinit(void)
111 {
112
113 //  s_SD_task_t task;
114
115 //  SD_task_t done_task, next_done_task;
116   xbt_die("This function is not working since the C++ links and others. Please report the problem if you really need that function.");
117
118    XBT_DEBUG("Recreating the swags...");
119
120 //  xbt_swag_foreach_safe(done_task, next_done_task, sd_global->done_task_set){
121 //    if (xbt_dynar_is_empty(done_task->tasks_before)){
122 //      __SD_task_set_state(done_task, SD_SCHEDULABLE);
123 //    } else{
124 //      __SD_task_set_state(done_task, SD_NOT_SCHEDULED);
125 //      done_task->unsatisfied_dependencies =
126 //        xbt_dynar_length(done_task->tasks_before);
127 //      done_task->is_not_ready = done_task->unsatisfied_dependencies;
128 //    }
129 //    free(done_task->workstation_list);
130 //    done_task->workstation_list = NULL;
131 //    done_task->workstation_nb = 0;
132 //  }
133
134   sd_global->task_number = 0;
135
136
137 #ifdef HAVE_JEDULE
138   jedule_sd_dump();
139   jedule_sd_cleanup();
140   jedule_sd_init();
141 #endif
142 }
143
144 /**
145  * \brief Creates the environment
146  *
147  * The environment (i.e. the \ref sg_host_management "hosts"
148  * and the \ref SD_link_management "links") is created with the data stored
149  * in the given XML platform file.
150  *
151  * \param platform_file name of an XML file describing the environment to create
152  * \see sg_host_management, SD_link_management
153  *
154  * The XML file follows this DTD:
155  *
156  *     \include simgrid.dtd
157  *
158  * Here is a small example of such a platform:
159  *
160  *     \include small_platform.xml
161  */
162 void SD_create_environment(const char *platform_file)
163 {
164   xbt_lib_cursor_t cursor = NULL;
165   char *name = NULL;
166   void **surf_storage = NULL;
167
168   parse_platform_file(platform_file);
169
170   /* now let's create the SD wrappers for storage elements */
171   xbt_lib_foreach(storage_lib, cursor, name, surf_storage) {
172     if(surf_storage[SURF_STORAGE_LEVEL])
173       __SD_storage_create(surf_storage[SURF_STORAGE_LEVEL], NULL);
174   }
175
176   XBT_DEBUG("Workstation number: %zu, link number: %d",
177          sg_host_count(), sg_link_count());
178 #ifdef HAVE_JEDULE
179   jedule_setup_platform();
180 #endif
181 }
182
183 /**
184  * \brief Launches the simulation.
185  *
186  * The function will execute the \ref SD_RUNNABLE runnable tasks.
187  * If \a how_long is positive, then the simulation will be stopped either
188  * when time reaches \a how_long or when a watch point is reached.
189  * A non-positive value for \a how_long means no time limit, in which case
190  * the simulation will be stopped either when a watch point is reached or
191  * when no more task can be executed.
192  * Then you can call SD_simulate() again.
193  *
194  * \param how_long maximum duration of the simulation (a negative value means
195  * no time limit)
196  * \return a dynar of \ref SD_task_t whose state has changed.
197  * \see SD_task_schedule(), SD_task_watch()
198  */
199
200 xbt_dynar_t SD_simulate(double how_long) {
201   /* we stop the simulation when total_time >= how_long */
202   double total_time = 0.0;
203   double elapsed_time = 0.0;
204   SD_task_t task, dst;
205   SD_dependency_t dependency;
206   surf_action_t action;
207   unsigned int iter, depcnt;
208   static int first_time = 1;
209
210   if (first_time) {
211     XBT_VERB("Starting simulation...");
212
213     surf_presolve();            /* Takes traces into account */
214     first_time = 0;
215   }
216
217   XBT_VERB("Run simulation for %f seconds", how_long);
218   sd_global->watch_point_reached = 0;
219
220   xbt_dynar_reset(sd_global->return_set);
221
222   /* explore the runnable tasks */
223   xbt_dynar_foreach(sd_global->executable_task_set , iter, task) {
224     XBT_VERB("Executing task '%s'", SD_task_get_name(task));
225     SD_task_run(task);
226     xbt_dynar_push(sd_global->return_set, &task);
227     iter--;
228   }
229
230   /* main loop */
231   elapsed_time = 0.0;
232   while (elapsed_time >= 0.0 &&
233          (how_long < 0.0 || 0.00001 < (how_long -total_time)) &&
234          !sd_global->watch_point_reached) {
235     surf_model_t model = NULL;
236     /* dumb variables */
237
238
239     XBT_DEBUG("Total time: %f", total_time);
240
241     elapsed_time = surf_solve(how_long > 0 ? surf_get_clock() + how_long - total_time: -1.0);
242     XBT_DEBUG("surf_solve() returns %f", elapsed_time);
243     if (elapsed_time > 0.0)
244       total_time += elapsed_time;
245
246     /* let's see which tasks are done */
247     xbt_dynar_foreach(all_existing_models, iter, model) {
248       while ((action = surf_model_extract_done_action_set(model))) {
249         task = (SD_task_t) action->getData();
250         task->start_time = task->surf_action->getStartTime();
251
252         task->finish_time = surf_get_clock();
253         XBT_VERB("Task '%s' done", SD_task_get_name(task));
254         SD_task_set_state(task, SD_DONE);
255         task->surf_action->unref();
256         task->surf_action = NULL;
257
258         /* the state has changed. Add it only if it's the first change */
259         if (xbt_dynar_search_or_negative(sd_global->return_set, &task) < 0) {
260           xbt_dynar_push(sd_global->return_set, &task);
261         }
262
263         /* remove the dependencies after this task */
264         xbt_dynar_foreach(task->tasks_after, depcnt, dependency) {
265           dst = dependency->dst;
266           if (dst->unsatisfied_dependencies > 0)
267             dst->unsatisfied_dependencies--;
268           if (dst->is_not_ready > 0)
269             dst->is_not_ready--;
270
271           XBT_DEBUG("Released a dependency on %s: %d remain(s). Became schedulable if %d=0",
272              SD_task_get_name(dst), dst->unsatisfied_dependencies,
273              dst->is_not_ready);
274
275           if (!(dst->unsatisfied_dependencies)) {
276             if (SD_task_get_state(dst) == SD_SCHEDULED)
277               SD_task_set_state(dst, SD_RUNNABLE);
278             else
279               SD_task_set_state(dst, SD_SCHEDULABLE);
280           }
281
282           if (SD_task_get_state(dst) == SD_NOT_SCHEDULED &&
283               !(dst->is_not_ready)) {
284             SD_task_set_state(dst, SD_SCHEDULABLE);
285           }
286
287           if (SD_task_get_kind(dst) == SD_TASK_COMM_E2E) {
288             SD_dependency_t comm_dep;
289             SD_task_t comm_dst;
290             xbt_dynar_get_cpy(dst->tasks_after, 0, &comm_dep);
291             comm_dst = comm_dep->dst;
292             if (SD_task_get_state(comm_dst) == SD_NOT_SCHEDULED &&
293                 comm_dst->is_not_ready > 0) {
294               comm_dst->is_not_ready--;
295
296             XBT_DEBUG("%s is a transfer, %s may be ready now if %d=0",
297                SD_task_get_name(dst), SD_task_get_name(comm_dst),
298                comm_dst->is_not_ready);
299
300               if (!(comm_dst->is_not_ready)) {
301                 SD_task_set_state(comm_dst, SD_SCHEDULABLE);
302               }
303             }
304           }
305
306           /* is dst runnable now? */
307           if (SD_task_get_state(dst) == SD_RUNNABLE
308               && !sd_global->watch_point_reached) {
309             XBT_VERB("Executing task '%s'", SD_task_get_name(dst));
310             SD_task_run(dst);
311             xbt_dynar_push(sd_global->return_set, &dst);
312           }
313         }
314       }
315
316       /* let's see which tasks have just failed */
317       while ((action = surf_model_extract_failed_action_set(model))) {
318         task = (SD_task_t) action->getData();
319         task->start_time = surf_action_get_start_time(task->surf_action);
320         task->finish_time = surf_get_clock();
321         XBT_VERB("Task '%s' failed", SD_task_get_name(task));
322         SD_task_set_state(task, SD_FAILED);
323         action->unref();
324         task->surf_action = NULL;
325
326         xbt_dynar_push(sd_global->return_set, &task);
327       }
328     }
329   }
330
331   if (!sd_global->watch_point_reached && how_long<0){
332     if ((int) xbt_dynar_length(sd_global->completed_task_set) <
333          sd_global->task_number){
334         XBT_WARN("Simulation is finished but %d tasks are still not done",
335             (sd_global->task_number -
336              (int) xbt_dynar_length(sd_global->completed_task_set)));
337         static const char* state_names[] =
338               { "SD_NOT_SCHEDULED", "SD_SCHEDULABLE", "SD_SCHEDULED",
339                 "SD_RUNNABLE", "SD_RUNNING", "SD_DONE",
340                 "SD_FAILED" };
341         xbt_dynar_foreach(sd_global->initial_task_set, iter, task){
342           XBT_WARN("%s is in %s state", SD_task_get_name(task),
343                    state_names[SD_task_get_state(task)]);
344         }
345     }
346   }
347
348   XBT_DEBUG("elapsed_time = %f, total_time = %f, watch_point_reached = %d",
349          elapsed_time, total_time, sd_global->watch_point_reached);
350   XBT_DEBUG("current time = %f", surf_get_clock());
351
352   return sd_global->return_set;
353 }
354
355 /**
356  * \brief Returns the current clock
357  *
358  * \return the current clock, in second
359  */
360 double SD_get_clock(void) {
361   return surf_get_clock();
362 }
363
364 /**
365  * \brief Destroys all SD internal data
366  *
367  * This function should be called when the simulation is over. Don't forget
368  * to destroy too.
369  *
370  * \see SD_init(), SD_task_destroy()
371  */
372 void SD_exit(void)
373 {
374   TRACE_surf_resource_utilization_release();
375
376   xbt_mallocator_free(sd_global->task_mallocator);
377
378   XBT_DEBUG("Destroying the dynars ...");
379   xbt_dynar_free_container(&(sd_global->initial_task_set));
380   xbt_dynar_free_container(&(sd_global->executable_task_set));
381   xbt_dynar_free_container(&(sd_global->completed_task_set));
382   xbt_dynar_free_container(&(sd_global->return_set));
383
384   TRACE_end();
385
386   xbt_free(sd_global);
387   sd_global = NULL;
388
389 #ifdef HAVE_JEDULE
390   jedule_sd_dump();
391   jedule_sd_cleanup();
392   jedule_sd_exit();
393 #endif
394
395   XBT_DEBUG("Exiting Surf...");
396   surf_exit();
397 }