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     free(done_task->workstation_list);
 142     done_task->workstation_list = NULL;
 143     done_task->workstation_nb = 0;
 144   }
 145
 146   xbt_swag_free(sd_global->done_task_set);
 147
 148   sd_global->scheduled_task_set =
 149       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 150   sd_global->runnable_task_set =
 151       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 152   sd_global->in_fifo_task_set =
 153       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 154   sd_global->running_task_set =
 155       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 156   sd_global->done_task_set =
 157       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 158   sd_global->failed_task_set =
 159       xbt_swag_new(xbt_swag_offset(task, state_hookup));
 160   sd_global->task_number = 0;
 161
 162
 163 #ifdef HAVE_JEDULE
 164   jedule_sd_dump();
 165   jedule_sd_cleanup();
 166   jedule_sd_init();
 167 #endif
 168 }
 169
 170 /**
 171  * \brief Creates the environment
 172  *
 173  * The environment (i.e. the \ref SD_workstation_management "workstations"
 174  * and the \ref SD_link_management "links") is created with the data stored
 175  * in the given XML platform file.
 176  *
 177  * \param platform_file name of an XML file describing the environment to create
 178  * \see SD_workstation_management, SD_link_management
 179  *
 180  * The XML file follows this DTD:
 181  *
 182  *     \include simgrid.dtd
 183  *
 184  * Here is a small example of such a platform:
 185  *
 186  *     \include small_platform.xml
 187  */
 188 void SD_create_environment(const char *platform_file)
 189 {
 190   xbt_lib_cursor_t cursor = NULL;
 191   char *name = NULL;
 192   void **surf_workstation = NULL;
 193   void **surf_link = NULL;
 194
 195   parse_platform_file(platform_file);
 196
 197   /* now let's create the SD wrappers for workstations and links */
 198   xbt_lib_foreach(host_lib, cursor, name, surf_workstation){
 199     if(surf_workstation[SURF_WKS_LEVEL])
 200       __SD_workstation_create(surf_workstation[SURF_WKS_LEVEL], NULL);
 201   }
 202
 203   xbt_lib_foreach(link_lib, cursor, name, surf_link) {
 204   if(surf_link[SURF_LINK_LEVEL])
 205     __SD_link_create(surf_link[SURF_LINK_LEVEL], NULL);
 206   }
 207
 208   XBT_DEBUG("Workstation number: %d, link number: %d",
 209          SD_workstation_get_number(), SD_link_get_number());
 210 #ifdef HAVE_JEDULE
 211   jedule_setup_platform();
 212 #endif
 213 }
 214
 215 /**
 216  * \brief Launches the simulation.
 217  *
 218  * The function will execute the \ref SD_RUNNABLE runnable tasks.
 219  * If \a how_long is positive, then the simulation will be stopped either
 220  * when time reaches \a how_long or when a watch point is reached.
 221  * A non-positive value for \a how_long means no time limit, in which case
 222  * the simulation will be stopped either when a watch point is reached or
 223  * when no more task can be executed.
 224  * Then you can call SD_simulate() again.
 225  *
 226  * \param how_long maximum duration of the simulation (a negative value means no time limit)
 227  * \return a dynar of \ref SD_task_t whose state has changed.
 228  * \see SD_task_schedule(), SD_task_watch()
 229  */
 230
 231 xbt_dynar_t SD_simulate(double how_long) {
 232   xbt_dynar_t changed_tasks = xbt_dynar_new(sizeof(SD_task_t), NULL);
 233   SD_task_t task;
 234
 235   SD_simulate_swag(how_long);
 236   while( (task = xbt_swag_extract(sd_global->return_set)) != NULL) {
 237     xbt_dynar_push(changed_tasks, &task);
 238   }
 239
 240   return changed_tasks;
 241 }
 242
 243 xbt_swag_t SD_simulate_swag(double how_long) {
 244   double total_time = 0.0;      /* we stop the simulation when total_time >= how_long */
 245   double elapsed_time = 0.0;
 246   SD_task_t task, task_safe, dst;
 247   SD_dependency_t dependency;
 248   surf_action_t action;
 249   unsigned int iter, depcnt;
 250   static int first_time = 1;
 251
 252   if (first_time) {
 253     XBT_VERB("Starting simulation...");
 254
 255     surf_presolve();            /* Takes traces into account */
 256     first_time = 0;
 257   }
 258
 259   XBT_VERB("Run simulation for %f seconds", how_long);
 260   sd_global->watch_point_reached = 0;
 261
 262   xbt_swag_reset(sd_global->return_set);
 263
 264   /* explore the runnable tasks */
 265   xbt_swag_foreach_safe(task, task_safe, sd_global->runnable_task_set) {
 266     XBT_VERB("Executing task '%s'", SD_task_get_name(task));
 267     if (__SD_task_try_to_run(task))
 268       xbt_swag_insert(task,sd_global->return_set);
 269   }
 270
 271   /* main loop */
 272   elapsed_time = 0.0;
 273   while (elapsed_time >= 0.0 &&
 274          (how_long < 0.0 || 0.00001 < (how_long -total_time)) &&
 275          !sd_global->watch_point_reached) {
 276     surf_model_t model = NULL;
 277     /* dumb variables */
 278
 279
 280     XBT_DEBUG("Total time: %f", total_time);
 281
 282     elapsed_time = surf_solve(how_long > 0 ? surf_get_clock() + how_long - total_time: -1.0);
 283     XBT_DEBUG("surf_solve() returns %f", elapsed_time);
 284     if (elapsed_time > 0.0)
 285       total_time += elapsed_time;
 286
 287     /* FIXME: shoud look at model_list or model_list_invoke? */
 288     /* let's see which tasks are done */
 289     xbt_dynar_foreach(model_list, iter, model) {
 290       while ((action = xbt_swag_extract(model->states.done_action_set))) {
 291         task = action->data;
 292         task->start_time =
 293             surf_workstation_model->
 294             action_get_start_time(task->surf_action);
 295         task->finish_time = surf_get_clock();
 296         XBT_VERB("Task '%s' done", SD_task_get_name(task));
 297         XBT_DEBUG("Calling __SD_task_just_done");
 298         __SD_task_just_done(task);
 299         XBT_DEBUG("__SD_task_just_done called on task '%s'",
 300                SD_task_get_name(task));
 301
 302         /* the state has changed */
 303         xbt_swag_insert(task,sd_global->return_set);
 304
 305         /* remove the dependencies after this task */
 306         xbt_dynar_foreach(task->tasks_after, depcnt, dependency) {
 307           dst = dependency->dst;
 308           if (dst->unsatisfied_dependencies > 0)
 309             dst->unsatisfied_dependencies--;
 310           if (dst->is_not_ready > 0)
 311             dst->is_not_ready--;
 312
 313           XBT_DEBUG("Released a dependency on %s: %d remain(s). Became schedulable if %d=0",
 314              SD_task_get_name(dst), dst->unsatisfied_dependencies,
 315              dst->is_not_ready);
 316
 317           if (!(dst->unsatisfied_dependencies)) {
 318             if (__SD_task_is_scheduled(dst))
 319               __SD_task_set_state(dst, SD_RUNNABLE);
 320             else
 321               __SD_task_set_state(dst, SD_SCHEDULABLE);
 322           }
 323
 324           if (__SD_task_is_not_scheduled(dst) && !(dst->is_not_ready)) {
 325             __SD_task_set_state(dst, SD_SCHEDULABLE);
 326           }
 327
 328           if (SD_task_get_kind(dst) == SD_TASK_COMM_E2E) {
 329             SD_dependency_t comm_dep;
 330             SD_task_t comm_dst;
 331             xbt_dynar_get_cpy(dst->tasks_after, 0, &comm_dep);
 332             comm_dst = comm_dep->dst;
 333             if (__SD_task_is_not_scheduled(comm_dst) &&
 334                 comm_dst->is_not_ready > 0) {
 335               comm_dst->is_not_ready--;
 336
 337             XBT_DEBUG("%s is a transfer, %s may be ready now if %d=0",
 338                SD_task_get_name(dst), SD_task_get_name(comm_dst),
 339                comm_dst->is_not_ready);
 340
 341               if (!(comm_dst->is_not_ready)) {
 342                 __SD_task_set_state(comm_dst, SD_SCHEDULABLE);
 343               }
 344             }
 345           }
 346
 347           /* is dst runnable now? */
 348           if (__SD_task_is_runnable(dst)
 349               && !sd_global->watch_point_reached) {
 350             XBT_VERB("Executing task '%s'", SD_task_get_name(dst));
 351             if (__SD_task_try_to_run(dst))
 352               xbt_swag_insert(dst,sd_global->return_set);
 353           }
 354         }
 355       }
 356
 357       /* let's see which tasks have just failed */
 358       while ((action = xbt_swag_extract(model->states.failed_action_set))) {
 359         task = action->data;
 360         task->start_time =
 361             surf_workstation_model->
 362             action_get_start_time(task->surf_action);
 363         task->finish_time = surf_get_clock();
 364         XBT_VERB("Task '%s' failed", SD_task_get_name(task));
 365         __SD_task_set_state(task, SD_FAILED);
 366         surf_workstation_model->action_unref(action);
 367         task->surf_action = NULL;
 368
 369         xbt_swag_insert(task,sd_global->return_set);
 370       }
 371     }
 372   }
 373
 374   if (!sd_global->watch_point_reached && how_long<0){
 375     if (xbt_swag_size(sd_global->done_task_set) < sd_global->task_number){
 376         XBT_WARN("Simulation is finished but %d tasks are still not done",
 377             (sd_global->task_number - xbt_swag_size(sd_global->done_task_set)));
 378         xbt_swag_foreach_safe (task, task_safe,sd_global->not_scheduled_task_set){
 379                 XBT_WARN("%s is in SD_NOT_SCHEDULED state", SD_task_get_name(task));
 380     }
 381       xbt_swag_foreach_safe (task, task_safe,sd_global->schedulable_task_set){
 382                 XBT_WARN("%s is in SD_SCHEDULABLE state", SD_task_get_name(task));
 383   }
 384         xbt_swag_foreach_safe (task, task_safe,sd_global->scheduled_task_set){
 385                 XBT_WARN("%s is in SD_SCHEDULED state", SD_task_get_name(task));
 386          }
 387     }
 388   }
 389
 390   XBT_DEBUG("elapsed_time = %f, total_time = %f, watch_point_reached = %d",
 391          elapsed_time, total_time, sd_global->watch_point_reached);
 392   XBT_DEBUG("current time = %f", surf_get_clock());
 393
 394   return sd_global->return_set;
 395 }
 396
 397 /**
 398  * \brief Returns the current clock
 399  *
 400  * \return the current clock, in second
 401  */
 402 double SD_get_clock(void) {
 403   return surf_get_clock();
 404 }
 405
 406 /**
 407  * \brief Destroys all SD internal data
 408  *
 409  * This function should be called when the simulation is over. Don't forget
 410  * to destroy too.
 411  *
 412  * \see SD_init(), SD_task_destroy()
 413  */
 414 void SD_exit(void)
 415 {
 416 #ifdef HAVE_TRACING
 417   TRACE_surf_resource_utilization_release();
 418 #endif
 419
 420   xbt_mallocator_free(sd_global->task_mallocator);
 421
 422   XBT_DEBUG("Destroying workstation and link arrays...");
 423   xbt_free(sd_global->workstation_list);
 424   xbt_free(sd_global->link_list);
 425   xbt_free(sd_global->recyclable_route);
 426
 427   XBT_DEBUG("Destroying the swags...");
 428   xbt_swag_free(sd_global->not_scheduled_task_set);
 429   xbt_swag_free(sd_global->schedulable_task_set);
 430   xbt_swag_free(sd_global->scheduled_task_set);
 431   xbt_swag_free(sd_global->runnable_task_set);
 432   xbt_swag_free(sd_global->in_fifo_task_set);
 433   xbt_swag_free(sd_global->running_task_set);
 434   xbt_swag_free(sd_global->done_task_set);
 435   xbt_swag_free(sd_global->failed_task_set);
 436   xbt_swag_free(sd_global->return_set);
 437
 438 #ifdef HAVE_TRACING
 439   TRACE_end();
 440 #endif
 441
 442   XBT_DEBUG("Exiting Surf...");
 443   surf_exit();
 444
 445   xbt_free(sd_global);
 446   sd_global = NULL;
 447
 448 #ifdef HAVE_JEDULE
 449   jedule_sd_dump();
 450   jedule_sd_cleanup();
 451 #endif
 452 }