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 "instr/instr_interface.h"
   9 #include "xbt/sysdep.h"
  10 #include "xbt/dynar.h"
  11 #include "surf/surf.h"
  12 #include "simgrid/sg_config.h"
  13 #include "xbt/ex.h"
  14 #include "xbt/log.h"
  15 #include "xbt/str.h"
  16 #include "xbt/config.h"
  17 #include "surf/surfxml_parse.h"
  18 #ifdef HAVE_LUA
  19 #include <lua.h>
  20 #include <lauxlib.h>
  21 #include <lualib.h>
  22 #endif
  23
  24 #ifdef HAVE_JEDULE
  25 #include "instr/jedule/jedule_sd_binding.h"
  26 #endif
  27
  28 XBT_LOG_NEW_CATEGORY(sd, "Logging specific to SimDag");
  29 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_kernel, sd,
  30                                 "Logging specific to SimDag (kernel)");
  31
  32 SD_global_t sd_global = NULL;
  33
  34 /**
  35  * \brief Initializes SD internal data
  36  *
  37  * This function must be called before any other SD function. Then you
  38  * should call SD_create_environment().
  39  *
  40  * \param argc argument number
  41  * \param argv argument list
  42  * \see SD_create_environment(), SD_exit()
  43  */
  44 void SD_init(int *argc, char **argv)
  45 {
  46 #ifdef HAVE_TRACING
  47   TRACE_global_init(argc, argv);
  48 #endif
  49
  50   s_SD_task_t task;
  51
  52   xbt_assert(sd_global == NULL, "SD_init() already called");
  53
  54   sd_global = xbt_new(s_SD_global_t, 1);
  55   sd_global->workstation_list = NULL;
  56   sd_global->link_list = NULL;
  57   sd_global->recyclable_route = NULL;
  58   sd_global->watch_point_reached = 0;
  59
  60   sd_global->task_mallocator=xbt_mallocator_new(65536, SD_task_new_f,SD_task_free_f,SD_task_recycle_f);
  61
  62   sd_global->not_scheduled_task_set =
  63       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  64   sd_global->schedulable_task_set =
  65       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  66   sd_global->scheduled_task_set =
  67       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  68   sd_global->runnable_task_set =
  69       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  70   sd_global->in_fifo_task_set =
  71       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  72   sd_global->running_task_set =
  73       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  74   sd_global->done_task_set =
  75       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  76   sd_global->failed_task_set =
  77       xbt_swag_new(xbt_swag_offset(task, state_hookup));
  78   sd_global->return_set =
  79       xbt_swag_new(xbt_swag_offset(task, return_hookup));
  80   sd_global->task_number = 0;
  81
  82   surf_init(argc, argv);
  83
  84   xbt_cfg_setdefault_string(_sg_cfg_set, "workstation/model",
  85                             "ptask_L07");
  86
  87 #ifdef HAVE_TRACING
  88   TRACE_start ();
  89 #endif
  90
  91 #ifdef HAVE_JEDULE
  92   jedule_sd_init();
  93 #endif
  94
  95   XBT_DEBUG("ADD SD LEVELS");
  96   SD_HOST_LEVEL = xbt_lib_add_level(host_lib,__SD_workstation_destroy);
  97   SD_LINK_LEVEL = xbt_lib_add_level(link_lib,__SD_link_destroy);
  98 }
  99
 100 /**
 101  * \brief Reinits the application part of the simulation (experimental feature)
 102  *
 103  * This function allows you to run several simulations on the same platform
 104  * by resetting the part describing the application.
 105  *
 106  * @warning: this function is still experimental and not perfect. For example,
 107  * the simulation clock (and traces usage) is not reset. So, do not use it if
 108  * you use traces in your simulation, and do not use absolute timing after using it.
 109  * That being said, this function is still precious if you want to compare a bunch of
 110  * heuristics on the same platforms.
 111  */
 112 void SD_application_reinit(void)
 113 {
 114
 115   s_SD_task_t task;
 116
 117   SD_task_t done_task, next_done_task;
 118
 119    XBT_DEBUG("Recreating the swags...");
 120   xbt_swag_free(sd_global->not_scheduled_task_set);
 121   xbt_swag_free(sd_global->schedulable_task_set);
 122   xbt_swag_free(sd_global->scheduled_task_set);
 123   xbt_swag_free(sd_global->runnable_task_set);
 124   xbt_swag_free(sd_global->in_fifo_task_set);
 125   xbt_swag_free(sd_global->running_task_set);
 126   xbt_swag_free(sd_global->failed_task_set);
 127
 128   sd_global->not_scheduled_task_set =
 129       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 130   sd_global->schedulable_task_set =
 131       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 132   xbt_swag_foreach_safe(done_task, next_done_task, sd_global->done_task_set){
 133     if (xbt_dynar_is_empty(done_task->tasks_before)){
 134       __SD_task_set_state(done_task, SD_SCHEDULABLE);
 135     } else{
 136       __SD_task_set_state(done_task, SD_NOT_SCHEDULED);
 137       done_task->unsatisfied_dependencies =
 138         xbt_dynar_length(done_task->tasks_before);
 139       done_task->is_not_ready = done_task->unsatisfied_dependencies;
 140     }
 141   }
 142
 143   xbt_swag_free(sd_global->done_task_set);
 144
 145   sd_global->scheduled_task_set =
 146       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 147   sd_global->runnable_task_set =
 148       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 149   sd_global->in_fifo_task_set =
 150       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 151   sd_global->running_task_set =
 152       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 153   sd_global->done_task_set =
 154       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 155   sd_global->failed_task_set =
 156       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 157   sd_global->task_number = 0;
 158
 159
 160 #ifdef HAVE_JEDULE
 161   jedule_sd_cleanup();
 162   jedule_sd_init();
 163 #endif
 164 }
 165
 166 /**
 167  * \brief Creates the environment
 168  *
 169  * The environment (i.e. the \ref SD_workstation_management "workstations"
 170  * and the \ref SD_link_management "links") is created with the data stored
 171  * in the given XML platform file.
 172  *
 173  * \param platform_file name of an XML file describing the environment to create
 174  * \see SD_workstation_management, SD_link_management
 175  *
 176  * The XML file follows this DTD:
 177  *
 178  *     \include simgrid.dtd
 179  *
 180  * Here is a small example of such a platform:
 181  *
 182  *     \include small_platform.xml
 183  */
 184 void SD_create_environment(const char *platform_file)
 185 {
 186   xbt_lib_cursor_t cursor = NULL;
 187   char *name = NULL;
 188   void **surf_workstation = NULL;
 189   void **surf_link = NULL;
 190
 191   parse_platform_file(platform_file);
 192
 193   /* now let's create the SD wrappers for workstations and links */
 194   xbt_lib_foreach(host_lib, cursor, name, surf_workstation){
 195     if(surf_workstation[SURF_WKS_LEVEL])
 196       __SD_workstation_create(surf_workstation[SURF_WKS_LEVEL], NULL);
 197   }
 198
 199   xbt_lib_foreach(link_lib, cursor, name, surf_link) {
 200   if(surf_link[SURF_LINK_LEVEL])
 201     __SD_link_create(surf_link[SURF_LINK_LEVEL], NULL);
 202   }
 203
 204   XBT_DEBUG("Workstation number: %d, link number: %d",
 205          SD_workstation_get_number(), SD_link_get_number());
 206 #ifdef HAVE_JEDULE
 207   jedule_setup_platform();
 208 #endif
 209 }
 210
 211 /**
 212  * \brief Launches the simulation.
 213  *
 214  * The function will execute the \ref SD_RUNNABLE runnable tasks.
 215  * If \a how_long is positive, then the simulation will be stopped either
 216  * when time reaches \a how_long or when a watch point is reached.
 217  * A non-positive value for \a how_long means no time limit, in which case
 218  * the simulation will be stopped either when a watch point is reached or
 219  * when no more task can be executed.
 220  * Then you can call SD_simulate() again.
 221  *
 222  * \param how_long maximum duration of the simulation (a negative value means no time limit)
 223  * \return a dynar of \ref SD_task_t whose state has changed.
 224  * \see SD_task_schedule(), SD_task_watch()
 225  */
 226
 227 xbt_dynar_t SD_simulate(double how_long) {
 228   xbt_dynar_t changed_tasks = xbt_dynar_new(sizeof(SD_task_t), NULL);
 229   SD_task_t task;
 230
 231   SD_simulate_swag(how_long);
 232   while( (task = xbt_swag_extract(sd_global->return_set)) != NULL) {
 233     xbt_dynar_push(changed_tasks, &task);
 234   }
 235
 236   return changed_tasks;
 237 }
 238
 239 xbt_swag_t SD_simulate_swag(double how_long) {
 240   double total_time = 0.0;      /* we stop the simulation when total_time >= how_long */
 241   double elapsed_time = 0.0;
 242   SD_task_t task, task_safe, dst;
 243   SD_dependency_t dependency;
 244   surf_action_t action;
 245   unsigned int iter, depcnt;
 246   static int first_time = 1;
 247
 248   if (first_time) {
 249     XBT_VERB("Starting simulation...");
 250
 251     surf_presolve();            /* Takes traces into account */
 252     first_time = 0;
 253   }
 254
 255   XBT_VERB("Run simulation for %f seconds", how_long);
 256   sd_global->watch_point_reached = 0;
 257
 258   xbt_swag_reset(sd_global->return_set);
 259
 260   /* explore the runnable tasks */
 261   xbt_swag_foreach_safe(task, task_safe, sd_global->runnable_task_set) {
 262     XBT_VERB("Executing task '%s'", SD_task_get_name(task));
 263     if (__SD_task_try_to_run(task))
 264       xbt_swag_insert(task,sd_global->return_set);
 265   }
 266
 267   /* main loop */
 268   elapsed_time = 0.0;
 269   while (elapsed_time >= 0.0 &&
 270          (how_long < 0.0 || 0.00001 < (how_long -total_time)) &&
 271          !sd_global->watch_point_reached) {
 272     surf_model_t model = NULL;
 273     /* dumb variables */
 274
 275
 276     XBT_DEBUG("Total time: %f", total_time);
 277
 278     elapsed_time = surf_solve(how_long > 0 ? surf_get_clock() + how_long - total_time: -1.0);
 279     XBT_DEBUG("surf_solve() returns %f", elapsed_time);
 280     if (elapsed_time > 0.0)
 281       total_time += elapsed_time;
 282
 283     /* let's see which tasks are done */
 284     xbt_dynar_foreach(model_list, iter, model) {
 285       while ((action = xbt_swag_extract(model->states.done_action_set))) {
 286         task = action->data;
 287         task->start_time =
 288             surf_workstation_model->
 289             action_get_start_time(task->surf_action);
 290         task->finish_time = surf_get_clock();
 291         XBT_VERB("Task '%s' done", SD_task_get_name(task));
 292         XBT_DEBUG("Calling __SD_task_just_done");
 293         __SD_task_just_done(task);
 294         XBT_DEBUG("__SD_task_just_done called on task '%s'",
 295                SD_task_get_name(task));
 296
 297         /* the state has changed */
 298         xbt_swag_insert(task,sd_global->return_set);
 299
 300         /* remove the dependencies after this task */
 301         xbt_dynar_foreach(task->tasks_after, depcnt, dependency) {
 302           dst = dependency->dst;
 303           if (dst->unsatisfied_dependencies > 0)
 304             dst->unsatisfied_dependencies--;
 305           if (dst->is_not_ready > 0)
 306             dst->is_not_ready--;
 307
 308           XBT_DEBUG("Released a dependency on %s: %d remain(s). Became schedulable if %d=0",
 309              SD_task_get_name(dst), dst->unsatisfied_dependencies,
 310              dst->is_not_ready);
 311
 312           if (!(dst->unsatisfied_dependencies)) {
 313             if (__SD_task_is_scheduled(dst))
 314               __SD_task_set_state(dst, SD_RUNNABLE);
 315             else
 316               __SD_task_set_state(dst, SD_SCHEDULABLE);
 317           }
 318
 319           if (__SD_task_is_not_scheduled(dst) && !(dst->is_not_ready)) {
 320             __SD_task_set_state(dst, SD_SCHEDULABLE);
 321           }
 322
 323           if (SD_task_get_kind(dst) == SD_TASK_COMM_E2E) {
 324             SD_dependency_t comm_dep;
 325             SD_task_t comm_dst;
 326             xbt_dynar_get_cpy(dst->tasks_after, 0, &comm_dep);
 327             comm_dst = comm_dep->dst;
 328             if (__SD_task_is_not_scheduled(comm_dst) &&
 329                 comm_dst->is_not_ready > 0) {
 330               comm_dst->is_not_ready--;
 331
 332             XBT_DEBUG("%s is a transfer, %s may be ready now if %d=0",
 333                SD_task_get_name(dst), SD_task_get_name(comm_dst),
 334                comm_dst->is_not_ready);
 335
 336               if (!(comm_dst->is_not_ready)) {
 337                 __SD_task_set_state(comm_dst, SD_SCHEDULABLE);
 338               }
 339             }
 340           }
 341
 342           /* is dst runnable now? */
 343           if (__SD_task_is_runnable(dst)
 344               && !sd_global->watch_point_reached) {
 345             XBT_VERB("Executing task '%s'", SD_task_get_name(dst));
 346             if (__SD_task_try_to_run(dst))
 347               xbt_swag_insert(dst,sd_global->return_set);
 348           }
 349         }
 350       }
 351
 352       /* let's see which tasks have just failed */
 353       while ((action = xbt_swag_extract(model->states.failed_action_set))) {
 354         task = action->data;
 355         task->start_time =
 356             surf_workstation_model->
 357             action_get_start_time(task->surf_action);
 358         task->finish_time = surf_get_clock();
 359         XBT_VERB("Task '%s' failed", SD_task_get_name(task));
 360         __SD_task_set_state(task, SD_FAILED);
 361         surf_workstation_model->action_unref(action);
 362         task->surf_action = NULL;
 363
 364         xbt_swag_insert(task,sd_global->return_set);
 365       }
 366     }
 367   }
 368
 369   if (!sd_global->watch_point_reached && how_long<0){
 370     if (xbt_swag_size(sd_global->done_task_set) < sd_global->task_number){
 371         XBT_WARN("Simulation is finished but %d tasks are still not done",
 372             (sd_global->task_number - xbt_swag_size(sd_global->done_task_set)));
 373         xbt_swag_foreach_safe (task, task_safe,sd_global->not_scheduled_task_set){
 374                 XBT_WARN("%s is in SD_NOT_SCHEDULED state", SD_task_get_name(task));
 375     }
 376       xbt_swag_foreach_safe (task, task_safe,sd_global->schedulable_task_set){
 377                 XBT_WARN("%s is in SD_SCHEDULABLE state", SD_task_get_name(task));
 378   }
 379         xbt_swag_foreach_safe (task, task_safe,sd_global->scheduled_task_set){
 380                 XBT_WARN("%s is in SD_SCHEDULED state", SD_task_get_name(task));
 381          }
 382     }
 383   }
 384
 385   XBT_DEBUG("elapsed_time = %f, total_time = %f, watch_point_reached = %d",
 386          elapsed_time, total_time, sd_global->watch_point_reached);
 387   XBT_DEBUG("current time = %f", surf_get_clock());
 388
 389   return sd_global->return_set;
 390 }
 391
 392 /**
 393  * \brief Returns the current clock
 394  *
 395  * \return the current clock, in second
 396  */
 397 double SD_get_clock(void) {
 398   return surf_get_clock();
 399 }
 400
 401 /**
 402  * \brief Destroys all SD internal data
 403  *
 404  * This function should be called when the simulation is over. Don't forget
 405  * to destroy too.
 406  *
 407  * \see SD_init(), SD_task_destroy()
 408  */
 409 void SD_exit(void)
 410 {
 411 #ifdef HAVE_TRACING
 412   TRACE_surf_resource_utilization_release();
 413 #endif
 414
 415   xbt_mallocator_free(sd_global->task_mallocator);
 416
 417   XBT_DEBUG("Destroying workstation and link arrays...");
 418   xbt_free(sd_global->workstation_list);
 419   xbt_free(sd_global->link_list);
 420   xbt_free(sd_global->recyclable_route);
 421
 422   XBT_DEBUG("Destroying the swags...");
 423   xbt_swag_free(sd_global->not_scheduled_task_set);
 424   xbt_swag_free(sd_global->schedulable_task_set);
 425   xbt_swag_free(sd_global->scheduled_task_set);
 426   xbt_swag_free(sd_global->runnable_task_set);
 427   xbt_swag_free(sd_global->in_fifo_task_set);
 428   xbt_swag_free(sd_global->running_task_set);
 429   xbt_swag_free(sd_global->done_task_set);
 430   xbt_swag_free(sd_global->failed_task_set);
 431   xbt_swag_free(sd_global->return_set);
 432
 433 #ifdef HAVE_TRACING
 434   TRACE_end();
 435 #endif
 436
 437   XBT_DEBUG("Exiting Surf...");
 438   surf_exit();
 439
 440   xbt_free(sd_global);
 441   sd_global = NULL;
 442
 443 #ifdef HAVE_JEDULE
 444   jedule_sd_dump();
 445   jedule_sd_cleanup();
 446 #endif
 447 }