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 #include "instr/instr_private.h"
  16 #include "surf/surfxml_parse.h"
  17 #ifdef HAVE_LUA
  18 #include <lua.h>
  19 #include <lauxlib.h>
  20 #include <lualib.h>
  21 #endif
  22
  23 #ifdef HAVE_JEDULE
  24 #include "instr/jedule/jedule_sd_binding.h"
  25 #endif
  26
  27 XBT_LOG_NEW_CATEGORY(sd, "Logging specific to SimDag");
  28 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_kernel, sd,
  29                                 "Logging specific to SimDag (kernel)");
  30
  31 SD_global_t sd_global = NULL;
  32
  33 XBT_LOG_EXTERNAL_CATEGORY(sd_kernel);
  34 XBT_LOG_EXTERNAL_CATEGORY(sd_task);
  35 XBT_LOG_EXTERNAL_CATEGORY(sd_workstation);
  36
  37 /**
  38  * \brief Initialises SD internal data
  39  *
  40  * This function must be called before any other SD function. Then you
  41  * should call SD_create_environment().
  42  *
  43  * \param argc argument number
  44  * \param argv argument list
  45  * \see SD_create_environment(), SD_exit()
  46  */
  47 void SD_init(int *argc, char **argv)
  48 {
  49 #ifdef HAVE_TRACING
  50   TRACE_global_init(argc, argv);
  51 #endif
  52
  53   s_SD_task_t task;
  54
  55   xbt_assert(sd_global == NULL, "SD_init() already called");
  56
  57   /* Connect our log channels: that must be done manually under windows */
  58   XBT_LOG_CONNECT(sd_kernel, sd);
  59   XBT_LOG_CONNECT(sd_task, sd);
  60   XBT_LOG_CONNECT(sd_workstation, sd);
  61
  62
  63   sd_global = xbt_new(s_SD_global_t, 1);
  64   sd_global->workstation_list = NULL;
  65   sd_global->link_list = NULL;
  66   sd_global->recyclable_route = NULL;
  67   sd_global->watch_point_reached = 0;
  68
  69   sd_global->task_mallocator=xbt_mallocator_new(65536, SD_task_new_f,SD_task_free_f,SD_task_recycle_f);
  70
  71   sd_global->not_scheduled_task_set =
  72       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  73   sd_global->schedulable_task_set =
  74       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  75   sd_global->scheduled_task_set =
  76       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  77   sd_global->runnable_task_set =
  78       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  79   sd_global->in_fifo_task_set =
  80       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  81   sd_global->running_task_set =
  82       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  83   sd_global->done_task_set =
  84       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  85   sd_global->failed_task_set =
  86       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  87   sd_global->return_set =
  88       xbt_swag_new(xbt_swag_offset(task, return_hookup));
  89   sd_global->task_number = 0;
  90
  91   surf_init(argc, argv);
  92
  93   xbt_cfg_setdefault_string(_surf_cfg_set, "workstation/model",
  94                             "ptask_L07");
  95
  96 #ifdef HAVE_TRACING
  97   TRACE_start ();
  98 #endif
  99
 100 #ifdef HAVE_JEDULE
 101   jedule_sd_init();
 102 #endif
 103
 104   XBT_DEBUG("ADD SD LEVELS");
 105   SD_HOST_LEVEL = xbt_lib_add_level(host_lib,__SD_workstation_destroy);
 106   SD_LINK_LEVEL = xbt_lib_add_level(link_lib,__SD_link_destroy);
 107 }
 108
 109 /**
 110  * \brief Reinits the application part of the simulation (experimental feature)
 111  *
 112  * This function allows you to run several simulations on the same platform
 113  * by resetting the part describing the application.
 114  *
 115  * @warning: this function is still experimental and not perfect. For example,
 116  * the simulation clock (and traces usage) is not reset. So, do not use it if
 117  * you use traces in your simulation, and do not use absolute timing after using it.
 118  * That being said, this function is still precious if you want to compare a bunch of
 119  * heuristics on the same platforms.
 120  */
 121 void SD_application_reinit(void)
 122 {
 123
 124   s_SD_task_t task;
 125
 126   XBT_DEBUG("Recreating the swags...");
 127   xbt_swag_free(sd_global->not_scheduled_task_set);
 128   xbt_swag_free(sd_global->schedulable_task_set);
 129   xbt_swag_free(sd_global->scheduled_task_set);
 130   xbt_swag_free(sd_global->runnable_task_set);
 131   xbt_swag_free(sd_global->in_fifo_task_set);
 132   xbt_swag_free(sd_global->running_task_set);
 133   xbt_swag_free(sd_global->done_task_set);
 134   xbt_swag_free(sd_global->failed_task_set);
 135
 136   sd_global->not_scheduled_task_set =
 137       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 138   sd_global->schedulable_task_set =
 139       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 140   sd_global->scheduled_task_set =
 141       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 142   sd_global->runnable_task_set =
 143       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 144   sd_global->in_fifo_task_set =
 145       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 146   sd_global->running_task_set =
 147       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 148   sd_global->done_task_set =
 149       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 150   sd_global->failed_task_set =
 151       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 152   sd_global->task_number = 0;
 153
 154 #ifdef HAVE_JEDULE
 155   jedule_sd_cleanup();
 156   jedule_sd_init();
 157 #endif
 158 }
 159
 160 /**
 161  * \brief Creates the environment
 162  *
 163  * The environment (i.e. the \ref SD_workstation_management "workstations" and the
 164  * \ref SD_link_management "links") is created with the data stored in the given XML
 165  * platform file.
 166  *
 167  * \param platform_file name of an XML file describing the environment to create
 168  * \see SD_workstation_management, SD_link_management
 169  *
 170  * The XML file follows this DTD:
 171  *
 172  *     \include simgrid.dtd
 173  *
 174  * Here is a small example of such a platform:
 175  *
 176  *     \include small_platform.xml
 177  */
 178 void SD_create_environment(const char *platform_file)
 179 {
 180   xbt_lib_cursor_t cursor = NULL;
 181   char *name = NULL;
 182   void **surf_workstation = NULL;
 183   void **surf_link = NULL;
 184
 185   platform_filename = xbt_strdup(platform_file);
 186
 187   // Reset callbacks
 188   surf_parse_reset_callbacks();
 189   // Add config callbacks
 190   surf_parse_add_callback_config();
 191
 192   parse_platform_file(platform_file);
 193   surf_config_models_create_elms();
 194
 195   /* now let's create the SD wrappers for workstations and links */
 196   xbt_lib_foreach(host_lib, cursor, name, surf_workstation){
 197           if(surf_workstation[SURF_WKS_LEVEL])
 198                   __SD_workstation_create(surf_workstation[SURF_WKS_LEVEL], NULL);
 199   }
 200
 201   xbt_lib_foreach(link_lib, cursor, name, surf_link) {
 202         if(surf_link[SURF_LINK_LEVEL])
 203     __SD_link_create(surf_link[SURF_LINK_LEVEL], NULL);
 204   }
 205
 206   XBT_DEBUG("Workstation number: %d, link number: %d",
 207          SD_workstation_get_number(), SD_link_get_number());
 208 #ifdef HAVE_JEDULE
 209   jedule_setup_platform();
 210 #endif
 211 }
 212
 213 /**
 214  * \brief Launches the simulation.
 215  *
 216  * The function will execute the \ref SD_RUNNABLE runnable tasks.
 217  * If \a how_long is positive, then the simulation will be stopped either
 218  * when time reaches \a how_long or when a watch point is reached.
 219  * A nonpositive value for \a how_long means no time limit, in which case
 220  * the simulation will be stopped either when a watch point is reached or
 221  * when no more task can be executed.
 222  * Then you can call SD_simulate() again.
 223  *
 224  * \param how_long maximum duration of the simulation (a negative value means no time limit)
 225  * \return a NULL-terminated array of \ref SD_task_t whose state has changed.
 226  * \see SD_task_schedule(), SD_task_watch()
 227  */
 228
 229 xbt_dynar_t SD_simulate(double how_long) {
 230   xbt_dynar_t changed_tasks = xbt_dynar_new(sizeof(SD_task_t), NULL);
 231   SD_task_t task;
 232
 233   SD_simulate_swag(how_long);
 234   while( (task = xbt_swag_extract(sd_global->return_set)) != NULL) {
 235     xbt_dynar_push(changed_tasks, &task);
 236   }
 237
 238   return changed_tasks;
 239 }
 240
 241 xbt_swag_t SD_simulate_swag(double how_long) {
 242   double total_time = 0.0;      /* we stop the simulation when total_time >= how_long */
 243   double elapsed_time = 0.0;
 244   SD_task_t task, task_safe, dst;
 245   SD_dependency_t dependency;
 246   surf_action_t action;
 247   unsigned int iter, depcnt;
 248   static int first_time = 1;
 249
 250    if (first_time) {
 251      XBT_VERB("Starting simulation...");
 252
 253      surf_presolve();            /* Takes traces into account */
 254      first_time = 0;
 255    }
 256
 257   sd_global->watch_point_reached = 0;
 258
 259   while(xbt_swag_extract(sd_global->return_set)) {}
 260
 261   /* explore the runnable tasks */
 262   xbt_swag_foreach(task, sd_global->runnable_task_set) {
 263     XBT_VERB("Executing task '%s'", SD_task_get_name(task));
 264     if (__SD_task_try_to_run(task))
 265       xbt_swag_insert(task,sd_global->return_set);
 266   }
 267
 268   /* main loop */
 269   elapsed_time = 0.0;
 270   while (elapsed_time >= 0.0 &&
 271          (how_long < 0.0 || total_time < how_long) &&
 272          !sd_global->watch_point_reached) {
 273     surf_model_t model = NULL;
 274     /* dumb variables */
 275
 276
 277     XBT_DEBUG("Total time: %f", total_time);
 278
 279     elapsed_time = surf_solve(how_long > 0 ? surf_get_clock() + how_long : -1.0);
 280     XBT_DEBUG("surf_solve() returns %f", elapsed_time);
 281     if (elapsed_time > 0.0)
 282       total_time += elapsed_time;
 283
 284     /* let's see which tasks are done */
 285     xbt_dynar_foreach(model_list, iter, model) {
 286       while ((action = xbt_swag_extract(model->states.done_action_set))) {
 287         task = action->data;
 288         task->start_time =
 289             surf_workstation_model->
 290             action_get_start_time(task->surf_action);
 291         task->finish_time = surf_get_clock();
 292         XBT_VERB("Task '%s' done", SD_task_get_name(task));
 293         XBT_DEBUG("Calling __SD_task_just_done");
 294         __SD_task_just_done(task);
 295         XBT_DEBUG("__SD_task_just_done called on task '%s'",
 296                SD_task_get_name(task));
 297
 298         /* the state has changed */
 299         xbt_swag_insert(task,sd_global->return_set);
 300
 301         /* remove the dependencies after this task */
 302         xbt_dynar_foreach(task->tasks_after, depcnt, dependency) {
 303           dst = dependency->dst;
 304           if (dst->unsatisfied_dependencies > 0)
 305             dst->unsatisfied_dependencies--;
 306           if (dst->is_not_ready > 0)
 307             dst->is_not_ready--;
 308
 309           if (!(dst->unsatisfied_dependencies)) {
 310             if (__SD_task_is_scheduled(dst))
 311               __SD_task_set_state(dst, SD_RUNNABLE);
 312             else
 313               __SD_task_set_state(dst, SD_SCHEDULABLE);
 314           }
 315
 316           if (SD_task_get_kind(dst) == SD_TASK_COMM_E2E) {
 317             SD_dependency_t comm_dep;
 318             SD_task_t comm_dst;
 319             xbt_dynar_get_cpy(dst->tasks_after, 0, &comm_dep);
 320             comm_dst = comm_dep->dst;
 321             if (__SD_task_is_not_scheduled(comm_dst) &&
 322                 comm_dst->is_not_ready > 0) {
 323               comm_dst->is_not_ready--;
 324
 325               if (!(comm_dst->is_not_ready)) {
 326                 __SD_task_set_state(comm_dst, SD_SCHEDULABLE);
 327               }
 328             }
 329           }
 330
 331           /* is dst runnable now? */
 332           if (__SD_task_is_runnable(dst)
 333               && !sd_global->watch_point_reached) {
 334             XBT_VERB("Executing task '%s'", SD_task_get_name(dst));
 335             if (__SD_task_try_to_run(dst))
 336               xbt_swag_insert(dst,sd_global->return_set);
 337           }
 338         }
 339       }
 340
 341       /* let's see which tasks have just failed */
 342       while ((action = xbt_swag_extract(model->states.failed_action_set))) {
 343         task = action->data;
 344         task->start_time =
 345             surf_workstation_model->
 346             action_get_start_time(task->surf_action);
 347         task->finish_time = surf_get_clock();
 348         XBT_VERB("Task '%s' failed", SD_task_get_name(task));
 349         __SD_task_set_state(task, SD_FAILED);
 350         surf_workstation_model->action_unref(action);
 351         task->surf_action = NULL;
 352
 353         xbt_swag_insert(task,sd_global->return_set);
 354       }
 355     }
 356   }
 357
 358   if (!sd_global->watch_point_reached && how_long<0){
 359     if (xbt_swag_size(sd_global->done_task_set) < sd_global->task_number){
 360         XBT_WARN("Simulation is finished but %d tasks are still not done",
 361             (sd_global->task_number - xbt_swag_size(sd_global->done_task_set)));
 362         xbt_swag_foreach_safe (task, task_safe,sd_global->not_scheduled_task_set){
 363                 XBT_WARN("%s is in SD_NOT_SCHEDULED state", SD_task_get_name(task));
 364                 }
 365         xbt_swag_foreach_safe (task, task_safe,sd_global->schedulable_task_set){
 366                 XBT_WARN("%s is in SD_SCHEDULABLE state", SD_task_get_name(task));
 367         }
 368         xbt_swag_foreach_safe (task, task_safe,sd_global->scheduled_task_set){
 369                 XBT_WARN("%s is in SD_SCHEDULED state", SD_task_get_name(task));
 370         }
 371     }
 372   }
 373
 374   XBT_DEBUG("elapsed_time = %f, total_time = %f, watch_point_reached = %d",
 375          elapsed_time, total_time, sd_global->watch_point_reached);
 376   XBT_DEBUG("current time = %f", surf_get_clock());
 377
 378   return sd_global->return_set;
 379 }
 380
 381 /**
 382  * \brief Returns the current clock
 383  *
 384  * \return the current clock, in second
 385  */
 386 double SD_get_clock(void) {
 387   return surf_get_clock();
 388 }
 389
 390 /**
 391  * \brief Destroys all SD internal data
 392  *
 393  * This function should be called when the simulation is over. Don't forget also to destroy
 394  * the tasks.
 395  *
 396  * \see SD_init(), SD_task_destroy()
 397  */
 398 void SD_exit(void)
 399 {
 400 #ifdef HAVE_TRACING
 401   TRACE_surf_release();
 402 #endif
 403
 404   xbt_mallocator_free(sd_global->task_mallocator);
 405
 406   XBT_DEBUG("Destroying workstation and link arrays if necessary...");
 407   if (sd_global->workstation_list != NULL)
 408     xbt_free(sd_global->workstation_list);
 409
 410   if (sd_global->link_list != NULL)
 411     xbt_free(sd_global->link_list);
 412
 413   if (sd_global->recyclable_route != NULL)
 414     xbt_free(sd_global->recyclable_route);
 415
 416   XBT_DEBUG("Destroying the swags...");
 417   xbt_swag_free(sd_global->not_scheduled_task_set);
 418   xbt_swag_free(sd_global->schedulable_task_set);
 419   xbt_swag_free(sd_global->scheduled_task_set);
 420   xbt_swag_free(sd_global->runnable_task_set);
 421   xbt_swag_free(sd_global->in_fifo_task_set);
 422   xbt_swag_free(sd_global->running_task_set);
 423   xbt_swag_free(sd_global->done_task_set);
 424   xbt_swag_free(sd_global->failed_task_set);
 425   xbt_swag_free(sd_global->return_set);
 426
 427   XBT_DEBUG("Exiting Surf...");
 428   surf_exit();
 429
 430   xbt_free(sd_global);
 431   sd_global = NULL;
 432
 433 #ifdef HAVE_TRACING
 434   TRACE_end();
 435 #endif
 436 #ifdef HAVE_JEDULE
 437   jedule_sd_dump();
 438   jedule_sd_cleanup();
 439 #endif
 440 }
 441
 442 /**
 443  * \brief load script file
 444  */
 445
 446 void SD_load_environment_script(const char *script_file)
 447 {
 448 #ifdef HAVE_LUA
 449   lua_State *L = lua_open();
 450   luaL_openlibs(L);
 451
 452   if (luaL_loadfile(L, script_file) || lua_pcall(L, 0, 0, 0)) {
 453     printf("error: %s\n", lua_tostring(L, -1));
 454     return;
 455   }
 456 #else
 457   xbt_die
 458       ("Lua is not available!! to call SD_load_environment_script, lua should be available...");
 459 #endif
 460   return;
 461 }