src/simdag/sd_global.c

   1 /* Copyright (c) 2006, 2007, 2008, 2009, 2010. 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 "private.h"
   8 #include "xbt/sysdep.h"
   9 #include "xbt/dynar.h"
  10 #include "surf/surf.h"
  11 #include "xbt/ex.h"
  12 #include "xbt/log.h"
  13 #include "xbt/str.h"
  14 #include "xbt/config.h"
  15 #ifdef HAVE_LUA
  16 #include <lua.h>
  17 #include <lauxlib.h>
  18 #include <lualib.h>
  19 #endif
  20
  21 XBT_LOG_NEW_CATEGORY(sd, "Logging specific to SimDag");
  22 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_kernel, sd,
  23                                 "Logging specific to SimDag (kernel)");
  24
  25 SD_global_t sd_global = NULL;
  26
  27 XBT_LOG_EXTERNAL_CATEGORY(sd_kernel);
  28 XBT_LOG_EXTERNAL_CATEGORY(sd_task);
  29 XBT_LOG_EXTERNAL_CATEGORY(sd_workstation);
  30
  31 /**
  32  * \brief Initialises SD internal data
  33  *
  34  * This function must be called before any other SD function. Then you
  35  * should call SD_create_environment().
  36  *
  37  * \param argc argument number
  38  * \param argv argument list
  39  * \see SD_create_environment(), SD_exit()
  40  */
  41 void SD_init(int *argc, char **argv)
  42 {
  43
  44   s_SD_task_t task;
  45
  46   xbt_assert0(!SD_INITIALISED(), "SD_init() already called");
  47
  48   /* Connect our log channels: that must be done manually under windows */
  49   XBT_LOG_CONNECT(sd_kernel, sd);
  50   XBT_LOG_CONNECT(sd_task, sd);
  51   XBT_LOG_CONNECT(sd_workstation, sd);
  52
  53
  54   sd_global = xbt_new(s_SD_global_t, 1);
  55   sd_global->workstations = xbt_dict_new();
  56   sd_global->workstation_count = 0;
  57   sd_global->workstation_list = NULL;
  58   sd_global->links = xbt_dict_new();
  59   sd_global->link_count = 0;
  60   sd_global->link_list = NULL;
  61   sd_global->recyclable_route = NULL;
  62   sd_global->watch_point_reached = 0;
  63
  64   sd_global->not_scheduled_task_set =
  65     xbt_swag_new(xbt_swag_offset(task, state_hookup));
  66   sd_global->schedulable_task_set =
  67     xbt_swag_new(xbt_swag_offset(task, state_hookup));
  68   sd_global->scheduled_task_set =
  69       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  70   sd_global->runnable_task_set =
  71     xbt_swag_new(xbt_swag_offset(task, state_hookup));
  72   sd_global->in_fifo_task_set =
  73     xbt_swag_new(xbt_swag_offset(task, state_hookup));
  74   sd_global->running_task_set =
  75     xbt_swag_new(xbt_swag_offset(task, state_hookup));
  76   sd_global->done_task_set =
  77     xbt_swag_new(xbt_swag_offset(task, state_hookup));
  78   sd_global->failed_task_set =
  79     xbt_swag_new(xbt_swag_offset(task, state_hookup));
  80   sd_global->task_number = 0;
  81
  82   surf_init(argc, argv);
  83   xbt_cfg_setdefault_string(_surf_cfg_set, "workstation/model", "ptask_L07");
  84 }
  85
  86 /**
  87  * \brief Reinits the application part of the simulation (experimental feature)
  88  *
  89  * This function allows you to run several simulations on the same platform
  90  * by resetting the part describing the application.
  91  *
  92  * @warning: this function is still experimental and not perfect. For example,
  93  * the simulation clock (and traces usage) is not reset. So, do not use it if
  94  * you use traces in your simulation, and do not use absolute timing after using it.
  95  * That being said, this function is still precious if you want to compare a bunch of
  96  * heuristics on the same platforms.
  97  */
  98 void SD_application_reinit(void)
  99 {
 100
 101   s_SD_task_t task;
 102
 103   if (SD_INITIALISED()) {
 104     DEBUG0("Recreating the swags...");
 105     xbt_swag_free(sd_global->not_scheduled_task_set);
 106     xbt_swag_free(sd_global->schedulable_task_set);
 107     xbt_swag_free(sd_global->scheduled_task_set);
 108     xbt_swag_free(sd_global->runnable_task_set);
 109     xbt_swag_free(sd_global->in_fifo_task_set);
 110     xbt_swag_free(sd_global->running_task_set);
 111     xbt_swag_free(sd_global->done_task_set);
 112     xbt_swag_free(sd_global->failed_task_set);
 113
 114     sd_global->not_scheduled_task_set =
 115       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 116     sd_global->schedulable_task_set =
 117       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 118     sd_global->scheduled_task_set =
 119       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 120     sd_global->runnable_task_set =
 121       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 122     sd_global->in_fifo_task_set =
 123       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 124     sd_global->running_task_set =
 125       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 126     sd_global->done_task_set =
 127       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 128     sd_global->failed_task_set =
 129       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 130     sd_global->task_number = 0;
 131   } else {
 132     WARN0("SD_application_reinit called before initialization of SimDag");
 133     /* we cannot use exceptions here because xbt is not running! */
 134   }
 135
 136 }
 137
 138 /**
 139  * \brief Creates the environment
 140  *
 141  * The environment (i.e. the \ref SD_workstation_management "workstations" and the
 142  * \ref SD_link_management "links") is created with the data stored in the given XML
 143  * platform file.
 144  *
 145  * \param platform_file name of an XML file describing the environment to create
 146  * \see SD_workstation_management, SD_link_management
 147  *
 148  * The XML file follows this DTD:
 149  *
 150  *     \include simgrid.dtd
 151  *
 152  * Here is a small example of such a platform:
 153  *
 154  *     \include small_platform.xml
 155  */
 156 void SD_create_environment(const char *platform_file)
 157 {
 158   xbt_dict_cursor_t cursor = NULL;
 159   char *name = NULL;
 160   void *surf_workstation = NULL;
 161   void *surf_link = NULL;
 162
 163   SD_CHECK_INIT_DONE();
 164
 165   DEBUG0("SD_create_environment");
 166
 167   surf_config_models_setup(platform_file);
 168   parse_platform_file(platform_file);
 169   surf_config_models_create_elms();
 170
 171   /* now let's create the SD wrappers for workstations and links */
 172   xbt_dict_foreach(surf_model_resource_set(surf_workstation_model), cursor,
 173                    name, surf_workstation) {
 174     __SD_workstation_create(surf_workstation, NULL);
 175   }
 176
 177   xbt_dict_foreach(surf_model_resource_set(surf_network_model), cursor, name, surf_link) {
 178     __SD_link_create(surf_link, NULL);
 179   }
 180
 181   DEBUG2("Workstation number: %d, link number: %d",
 182          SD_workstation_get_number(), SD_link_get_number());
 183 }
 184
 185 /**
 186  * \brief Launches the simulation.
 187  *
 188  * The function will execute the \ref SD_RUNNABLE runnable tasks.
 189  * The simulation will be stopped when its time reaches \a how_long,
 190  * when a watch point is reached, or when no more task can be executed.
 191  * Then you can call SD_simulate() again.
 192  *
 193  * \param how_long maximum duration of the simulation (a negative value means no time limit)
 194  * \return a NULL-terminated array of \ref SD_task_t whose state has changed.
 195  * \see SD_task_schedule(), SD_task_watch()
 196  */
 197 xbt_dynar_t SD_simulate(double how_long)
 198 {
 199   double total_time = 0.0;      /* we stop the simulation when total_time >= how_long */
 200   double elapsed_time = 0.0;
 201   SD_task_t task, task_safe, dst;
 202   SD_dependency_t dependency;
 203   surf_action_t action;
 204   xbt_dynar_t changed_tasks = xbt_dynar_new(sizeof(SD_task_t), NULL);
 205   unsigned int iter, depcnt;
 206   static int first_time = 1;
 207
 208   SD_CHECK_INIT_DONE();
 209
 210   VERB0("Starting simulation...");
 211
 212   if (first_time) {
 213     surf_presolve();            /* Takes traces into account */
 214     first_time = 0;
 215   }
 216
 217   if (how_long > 0) {
 218     surf_timer_model->extension.timer.set(surf_get_clock() + how_long,
 219                                           NULL, NULL);
 220   }
 221   sd_global->watch_point_reached = 0;
 222
 223   /* explore the runnable tasks */
 224   xbt_swag_foreach_safe(task, task_safe, sd_global->runnable_task_set) {
 225     VERB1("Executing task '%s'", SD_task_get_name(task));
 226     if (__SD_task_try_to_run(task) && !xbt_dynar_member(changed_tasks, &task))
 227       xbt_dynar_push(changed_tasks, &task);
 228   }
 229
 230   /* main loop */
 231   elapsed_time = 0.0;
 232   while (elapsed_time >= 0.0 &&
 233          (how_long < 0.0 || total_time < how_long) &&
 234          !sd_global->watch_point_reached) {
 235     surf_model_t model = NULL;
 236     /* dumb variables */
 237     void *fun = NULL;
 238     void *arg = NULL;
 239
 240
 241     DEBUG1("Total time: %f", total_time);
 242
 243     elapsed_time = surf_solve();
 244     DEBUG1("surf_solve() returns %f", elapsed_time);
 245     if (elapsed_time > 0.0)
 246       total_time += elapsed_time;
 247
 248     /* let's see which tasks are done */
 249     xbt_dynar_foreach(model_list, iter, model) {
 250       while ((action = xbt_swag_extract(model->states.done_action_set))) {
 251         task = action->data;
 252         task->start_time = surf_workstation_model->action_get_start_time(task->surf_action);
 253         task->finish_time = surf_get_clock();
 254         VERB1("Task '%s' done", SD_task_get_name(task));
 255         DEBUG0("Calling __SD_task_just_done");
 256         __SD_task_just_done(task);
 257         DEBUG1("__SD_task_just_done called on task '%s'",
 258                SD_task_get_name(task));
 259
 260         /* the state has changed */
 261         if (!xbt_dynar_member(changed_tasks, &task))
 262           xbt_dynar_push(changed_tasks, &task);
 263
 264         /* remove the dependencies after this task */
 265         xbt_dynar_foreach(task->tasks_after, depcnt, dependency){
 266                         dst = dependency->dst;
 267           if (dst->unsatisfied_dependencies>0)
 268                   dst->unsatisfied_dependencies--;
 269           if (dst->is_not_ready>0)
 270                   dst->is_not_ready--;
 271
 272           if (!(dst->unsatisfied_dependencies)){
 273                   if (__SD_task_is_scheduled(dst))
 274                           __SD_task_set_state(dst, SD_RUNNABLE);
 275                   else
 276                           __SD_task_set_state(dst, SD_SCHEDULABLE);
 277           }
 278
 279           if (SD_task_get_kind(dst) == SD_TASK_COMM_E2E){
 280                   SD_dependency_t comm_dep;
 281                   SD_task_t comm_dst;
 282                   xbt_dynar_get_cpy(dst->tasks_after, 0, &comm_dep);
 283                   comm_dst = comm_dep->dst;
 284                   if (__SD_task_is_not_scheduled(comm_dst) &&
 285                           comm_dst->is_not_ready>0){
 286                           comm_dst->is_not_ready--;
 287
 288                           if (!(comm_dst->is_not_ready)){
 289                                   __SD_task_set_state(comm_dst, SD_SCHEDULABLE);
 290                           }
 291                   }
 292           }
 293
 294           /* is dst runnable now? */
 295           if (__SD_task_is_runnable(dst) && !sd_global->watch_point_reached) {
 296             VERB1("Executing task '%s'", SD_task_get_name(dst));
 297             if (__SD_task_try_to_run(dst) &&
 298                 !xbt_dynar_member(changed_tasks, &task))
 299               xbt_dynar_push(changed_tasks, &task);
 300           }
 301         }
 302       }
 303
 304       /* let's see which tasks have just failed */
 305       while ((action = xbt_swag_extract(model->states.failed_action_set))) {
 306         task = action->data;
 307         task->start_time = surf_workstation_model->action_get_start_time(task->surf_action);
 308         task->finish_time = surf_get_clock();
 309         VERB1("Task '%s' failed", SD_task_get_name(task));
 310         __SD_task_set_state(task, SD_FAILED);
 311         surf_workstation_model->action_unref(action);
 312         task->surf_action = NULL;
 313
 314         if (!xbt_dynar_member(changed_tasks, &task))
 315           xbt_dynar_push(changed_tasks, &task);
 316       }
 317     }
 318
 319     while (surf_timer_model->extension.timer.get(&fun, (void *) &arg)) {
 320     }
 321   }
 322
 323   VERB0("Simulation finished");
 324   DEBUG3("elapsed_time = %f, total_time = %f, watch_point_reached = %d",
 325          elapsed_time, total_time, sd_global->watch_point_reached);
 326   DEBUG1("current time = %f", surf_get_clock());
 327
 328   return changed_tasks;
 329 }
 330
 331 /**
 332  * \brief Returns the current clock
 333  *
 334  * \return the current clock, in second
 335  */
 336 double SD_get_clock(void)
 337 {
 338   SD_CHECK_INIT_DONE();
 339
 340   return surf_get_clock();
 341 }
 342
 343 /**
 344  * \brief Destroys all SD internal data
 345  *
 346  * This function should be called when the simulation is over. Don't forget also to destroy
 347  * the tasks.
 348  *
 349  * \see SD_init(), SD_task_destroy()
 350  */
 351 void SD_exit(void)
 352 {
 353   if (SD_INITIALISED()) {
 354     DEBUG0("Destroying workstation and link dictionaries...");
 355     xbt_dict_free(&sd_global->workstations);
 356     xbt_dict_free(&sd_global->links);
 357
 358     DEBUG0("Destroying workstation and link arrays if necessary...");
 359     if (sd_global->workstation_list != NULL)
 360       xbt_free(sd_global->workstation_list);
 361
 362     if (sd_global->link_list != NULL)
 363       xbt_free(sd_global->link_list);
 364
 365     if (sd_global->recyclable_route != NULL)
 366       xbt_free(sd_global->recyclable_route);
 367
 368     DEBUG0("Destroying the swags...");
 369     xbt_swag_free(sd_global->not_scheduled_task_set);
 370     xbt_swag_free(sd_global->schedulable_task_set);
 371     xbt_swag_free(sd_global->scheduled_task_set);
 372     xbt_swag_free(sd_global->runnable_task_set);
 373     xbt_swag_free(sd_global->in_fifo_task_set);
 374     xbt_swag_free(sd_global->running_task_set);
 375     xbt_swag_free(sd_global->done_task_set);
 376     xbt_swag_free(sd_global->failed_task_set);
 377
 378     xbt_free(sd_global);
 379     sd_global = NULL;
 380
 381     DEBUG0("Exiting Surf...");
 382     surf_exit();
 383   } else {
 384     WARN0("SD_exit() called, but SimDag is not running");
 385     /* we cannot use exceptions here because xbt is not running! */
 386   }
 387 }
 388
 389 /**
 390  * \bried load script file
 391  */
 392
 393 void SD_load_environment_script(const char* script_file)
 394 {
 395 #ifdef HAVE_LUA
 396     lua_State *L = lua_open();
 397     luaL_openlibs(L);
 398
 399     if (luaL_loadfile(L, script_file) || lua_pcall(L, 0, 0, 0)) {
 400          printf("error: %s\n", lua_tostring(L, -1));
 401          return;
 402        }
 403 #else
 404     xbt_die("Lua is not available!! to call SD_load_environment_script, lua should be available...");
 405 #endif
 406     return;
 407 }