src/simdag/sd_global.c

   1 #include "private.h"
   2 #include "xbt/sysdep.h"
   3 #include "xbt/dynar.h"
   4 #include "surf/surf.h"
   5 #include "xbt/ex.h"
   6 #include "xbt/log.h"
   7 #include "xbt/config.h"
   8
   9 XBT_LOG_NEW_CATEGORY(sd,"Logging specific to SimDag");
  10 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_kernel,sd,
  11                                 "Logging specific to SimDag (kernel)");
  12
  13 SD_global_t sd_global = NULL;
  14
  15 /* $Id$ */
  16
  17 /* Copyright (c) 2007 Arnaud Legrand.
  18    All rights reserved.                                          */
  19
  20 /* This program is free software; you can redistribute it and/or modify it
  21  * under the terms of the license (GNU LGPL) which comes with this package. */
  22
  23 static int _sd_init_status = 0; /* 0: beginning of time;
  24                                    1: pre-inited (cfg_set created);
  25                                    2: inited (running) */
  26 static xbt_cfg_t _sd_cfg_set = NULL;
  27
  28 /* callback of the workstation_model variable */
  29 static void _sd_cfg_cb__workstation_model(const char *name, int pos)
  30 {
  31   char *val;
  32
  33   xbt_assert0(_sd_init_status < 2,
  34               "Cannot change the model after the initialization");
  35
  36   val = xbt_cfg_get_string(_sd_cfg_set, name);
  37   find_resource_description(surf_workstation_resource_description,
  38                             surf_workstation_resource_description_size,
  39                             val);
  40 }
  41
  42 /* callback of the cpu_model variable */
  43 static void _sd_cfg_cb__cpu_model(const char *name, int pos)
  44 {
  45   char *val;
  46
  47   xbt_assert0(_sd_init_status < 2,
  48               "Cannot change the model after the initialization");
  49
  50   val = xbt_cfg_get_string(_sd_cfg_set, name);
  51   find_resource_description(surf_cpu_resource_description,
  52                             surf_cpu_resource_description_size, val);
  53 }
  54
  55 /* callback of the workstation_model variable */
  56 static void _sd_cfg_cb__network_model(const char *name, int pos)
  57 {
  58   char *val;
  59
  60   xbt_assert0(_sd_init_status < 2,
  61               "Cannot change the model after the initialization");
  62
  63   val = xbt_cfg_get_string(_sd_cfg_set, name);
  64   find_resource_description(surf_network_resource_description,
  65                             surf_network_resource_description_size, val);
  66 }
  67
  68 /* create the config set and register what should be */
  69 static void sd_config_init(void)
  70 {
  71
  72   if (_sd_init_status)
  73     return;                     /* Already inited, nothing to do */
  74
  75   _sd_init_status = 1;
  76   _sd_cfg_set = xbt_cfg_new();
  77
  78   xbt_cfg_register(_sd_cfg_set,
  79                    "workstation_model", xbt_cfgelm_string, 1, 1,
  80                    &_sd_cfg_cb__workstation_model, NULL);
  81
  82   xbt_cfg_register(_sd_cfg_set,
  83                    "cpu_model", xbt_cfgelm_string, 1, 1,
  84                    &_sd_cfg_cb__cpu_model, NULL);
  85   xbt_cfg_register(_sd_cfg_set,
  86                    "network_model", xbt_cfgelm_string, 1, 1,
  87                    &_sd_cfg_cb__network_model, NULL);
  88
  89   xbt_cfg_set_string(_sd_cfg_set, "workstation_model", "ptask_L07");
  90 }
  91
  92 static void sd_config_finalize(void)
  93 {
  94
  95   if (!_sd_init_status)
  96     return;                     /* Not initialized yet. Nothing to do */
  97
  98   xbt_cfg_free(&_sd_cfg_set);
  99   _sd_init_status = 0;
 100 }
 101
 102 static void sd_config(const char *name, va_list pa)
 103 {
 104   if (!_sd_init_status) {
 105     sd_config_init();
 106   }
 107   xbt_cfg_set_vargs(_sd_cfg_set, name, pa);
 108 }
 109
 110
 111 static void __sd_config_helper(const char *name, ...)
 112 {
 113   va_list pa;
 114   va_start(pa, name);
 115
 116   sd_config(name, pa);
 117
 118   va_end(pa);
 119 }
 120
 121 static void sd_cfg_control_set(const char *control_string)
 122 {
 123   /* To split the string in commands, and the cursors */
 124   xbt_dynar_t set_strings;
 125   char *str;
 126   int cpt;
 127
 128   if (!control_string)
 129     return;
 130   DEBUG1("Parse log settings '%s'", control_string);
 131
 132   /* split the string, and remove empty entries */
 133   set_strings = xbt_str_split_quoted(control_string);
 134
 135   if (xbt_dynar_length(set_strings) == 0) {     /* vicious user! */
 136     xbt_dynar_free(&set_strings);
 137     return;
 138   }
 139   /* Parse each entry and either use it right now (if the category was already
 140      created), or store it for further use */
 141   xbt_dynar_foreach(set_strings, cpt, str) {
 142     char *control_string, *control_string_sav, *name, *value;
 143
 144
 145     control_string = control_string_sav = strdup(str);
 146     control_string += strspn(control_string, " ");
 147     name = control_string;
 148     control_string += strcspn(str, ":=");
 149     value = control_string;
 150     *value = 0;
 151     value++;
 152
 153     xbt_assert1(strlen(name) != 0, "Invalid name for configuration: '%s'",
 154                 name);
 155     xbt_assert1(strlen(value) != 0,
 156                 "Invalid value for configuration: '%s'", value);
 157     INFO2("setting '%s' to '%s'", name, value);
 158
 159     __sd_config_helper(name, value);
 160
 161     free(control_string_sav);
 162   }
 163   xbt_dynar_free(&set_strings);
 164 }
 165
 166 static void sd_cfg_init(int *argc, char **argv)
 167 {
 168   int i, j;
 169   char *opt;
 170
 171   for (i = 1; i < *argc; i++) {
 172     if (!strncmp(argv[i], "--cfg=", strlen("--cfg="))) {
 173       opt = strchr(argv[i], '=');
 174       opt++;
 175
 176       sd_cfg_control_set(opt);
 177       DEBUG1("Did apply '%s' as config setting", opt);
 178       /*remove this from argv */
 179
 180       for (j = i + 1; j < *argc; j++) {
 181         argv[j - 1] = argv[j];
 182       }
 183
 184       argv[j - 1] = NULL;
 185       (*argc)--;
 186       i--;                      /* compensate effect of next loop incrementation */
 187     }
 188   }
 189 }
 190
 191 /**
 192  * \brief Initialises SD internal data
 193  *
 194  * This function must be called before any other SD function. Then you
 195  * should call SD_create_environment().
 196  *
 197  * \param argc argument number
 198  * \param argv argument list
 199  * \see SD_create_environment(), SD_exit()
 200  */
 201 void SD_init(int *argc, char **argv) {
 202
 203   s_SD_task_t task;
 204
 205   xbt_assert0( !SD_INITIALISED() , "SD_init() already called");
 206
 207   sd_global = xbt_new(s_SD_global_t, 1);
 208   sd_global->workstations = xbt_dict_new();
 209   sd_global->workstation_count = 0;
 210   sd_global->workstation_list = NULL;
 211   sd_global->links = xbt_dict_new();
 212   sd_global->link_count = 0;
 213   sd_global->link_list = NULL;
 214   sd_global->recyclable_route = NULL;
 215   sd_global->watch_point_reached = 0;
 216
 217   sd_global->not_scheduled_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 218   sd_global->scheduled_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 219   sd_global->ready_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 220   sd_global->in_fifo_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 221   sd_global->running_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 222   sd_global->done_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 223   sd_global->failed_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 224   sd_global->task_number = 0;
 225
 226   surf_init(argc, argv);
 227   sd_cfg_init(argc, argv);
 228 }
 229
 230 /**
 231  * \brief Reinits the application part of the simulation (experimental feature)
 232  *
 233  * This function allows you to run several simulations on the same platform
 234  * by resetting the part describing the application.
 235  *
 236  * @warning: this function is still experimental and not perfect. For example,
 237  * the simulation clock (and traces usage) is not reset. So, do not use it if
 238  * you use traces in your simulation, and do not use absolute timing after using it.
 239  * That being said, this function is still precious if you want to compare a bunch of
 240  * heuristics on the same platforms.
 241  */
 242 void SD_application_reinit(void) {
 243
 244   s_SD_task_t task;
 245
 246   if (SD_INITIALISED()) {
 247     DEBUG0("Recreating the swags...");
 248     xbt_swag_free(sd_global->not_scheduled_task_set);
 249     xbt_swag_free(sd_global->scheduled_task_set);
 250     xbt_swag_free(sd_global->ready_task_set);
 251     xbt_swag_free(sd_global->in_fifo_task_set);
 252     xbt_swag_free(sd_global->running_task_set);
 253     xbt_swag_free(sd_global->done_task_set);
 254     xbt_swag_free(sd_global->failed_task_set);
 255
 256     sd_global->not_scheduled_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 257     sd_global->scheduled_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 258     sd_global->ready_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 259     sd_global->in_fifo_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 260     sd_global->running_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 261     sd_global->done_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 262     sd_global->failed_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
 263     sd_global->task_number = 0;
 264   } else {
 265     WARN0("SD_application_reinit called before initialization of SimDag");
 266     /* we cannot use exceptions here because xbt is not running! */
 267   }
 268
 269 }
 270
 271 /**
 272  * \brief Creates the environment
 273  *
 274  * The environment (i.e. the \ref SD_workstation_management "workstations" and the
 275  * \ref SD_link_management "links") is created with the data stored in the given XML
 276  * platform file.
 277  *
 278  * \param platform_file name of an XML file describing the environment to create
 279  * \see SD_workstation_management, SD_link_management
 280  *
 281  * The XML file follows this DTD:
 282  *
 283  *     \include surfxml.dtd
 284  *
 285  * Here is a small example of such a platform:
 286  *
 287  *     \include small_platform.xml
 288  */
 289 void SD_create_environment(const char *platform_file) {
 290   xbt_dict_cursor_t cursor = NULL;
 291   char *name = NULL;
 292   void *surf_workstation = NULL;
 293   void *surf_link = NULL;
 294   char *workstation_model_name;
 295   int workstation_id = -1;
 296
 297   SD_CHECK_INIT_DONE();
 298
 299   DEBUG0("SD_create_environment");
 300
 301   sd_config_init();
 302   surf_timer_resource_init(platform_file);
 303
 304   workstation_model_name =
 305       xbt_cfg_get_string(_sd_cfg_set, "workstation_model");
 306
 307   DEBUG1("Model : %s", workstation_model_name);
 308   workstation_id =
 309       find_resource_description(surf_workstation_resource_description,
 310                                 surf_workstation_resource_description_size,
 311                                 workstation_model_name);
 312   if (!strcmp(workstation_model_name, "compound")) {
 313     xbt_ex_t e;
 314     char *network_model_name = NULL;
 315     char *cpu_model_name = NULL;
 316     int network_id = -1;
 317     int cpu_id = -1;
 318
 319     TRY {
 320       cpu_model_name = xbt_cfg_get_string(_sd_cfg_set, "cpu_model");
 321     } CATCH(e) {
 322       if (e.category == bound_error) {
 323         xbt_assert0(0,
 324                     "Set a cpu model to use with the 'compound' workstation model");
 325         xbt_ex_free(e);
 326       } else {
 327         RETHROW;
 328       }
 329     }
 330
 331     TRY {
 332       network_model_name =
 333           xbt_cfg_get_string(_sd_cfg_set, "network_model");
 334     }
 335     CATCH(e) {
 336       if (e.category == bound_error) {
 337         xbt_assert0(0,
 338                     "Set a network model to use with the 'compound' workstation model");
 339         xbt_ex_free(e);
 340       } else {
 341         RETHROW;
 342       }
 343     }
 344
 345     network_id =
 346         find_resource_description(surf_network_resource_description,
 347                                   surf_network_resource_description_size,
 348                                   network_model_name);
 349     cpu_id =
 350         find_resource_description(surf_cpu_resource_description,
 351                                   surf_cpu_resource_description_size,
 352                                   cpu_model_name);
 353
 354     surf_cpu_resource_description[cpu_id].resource_init(platform_file);
 355     surf_network_resource_description[network_id].resource_init(platform_file);
 356   }
 357
 358   DEBUG0("Call workstation_resource_init");
 359   surf_workstation_resource_description[workstation_id].
 360       resource_init(platform_file);
 361
 362   _sd_init_status = 2;
 363
 364   /* now let's create the SD wrappers for workstations and links */
 365   xbt_dict_foreach(workstation_set, cursor, name, surf_workstation) {
 366     __SD_workstation_create(surf_workstation, NULL);
 367   }
 368
 369   xbt_dict_foreach(network_link_set, cursor, name, surf_link) {
 370     __SD_link_create(surf_link, NULL);
 371   }
 372
 373   DEBUG2("Workstation number: %d, link number: %d", SD_workstation_get_number(), SD_link_get_number());
 374 }
 375
 376 /**
 377  * \brief Launches the simulation.
 378  *
 379  * The function will execute the \ref SD_READY ready tasks.
 380  * The simulation will be stopped when its time reaches \a how_long,
 381  * when a watch point is reached, or when no more task can be executed.
 382  * Then you can call SD_simulate() again.
 383  *
 384  * \param how_long maximum duration of the simulation (a negative value means no time limit)
 385  * \return a NULL-terminated array of \ref SD_task_t whose state has changed.
 386  * \see SD_task_schedule(), SD_task_watch()
 387  */
 388 SD_task_t* SD_simulate(double how_long)
 389 {
 390   double total_time = 0.0; /* we stop the simulation when total_time >= how_long */
 391   double elapsed_time = 0.0;
 392   SD_task_t task, dst;
 393   SD_dependency_t dependency;
 394   surf_action_t action;
 395   SD_task_t *changed_tasks = NULL;
 396   int changed_task_number = 0;
 397   int changed_task_capacity = sd_global->task_number + 1;
 398   int i;
 399   static int first_time = 1;
 400
 401   SD_CHECK_INIT_DONE();
 402
 403   INFO0("Starting simulation...");
 404
 405   /* create the array that will be returned */
 406   changed_tasks = xbt_new(SD_task_t, changed_task_capacity);
 407   changed_tasks[0] = NULL;
 408
 409   if (first_time) {
 410     surf_solve(); /* Takes traces into account. Returns 0.0 */
 411     first_time = 0;
 412   }
 413
 414   if(how_long>0) {
 415     surf_timer_resource->extension_public->set(surf_get_clock()+how_long,
 416                                                NULL,NULL);
 417   }
 418   sd_global->watch_point_reached = 0;
 419
 420   /* explore the ready tasks */
 421   xbt_swag_foreach(task, sd_global->ready_task_set) {
 422     INFO1("Executing task '%s'", SD_task_get_name(task));
 423     if ((task->state_changed = __SD_task_try_to_run(task))) {
 424       changed_tasks[changed_task_number++] = task; /* replace NULL by the task */
 425       /*
 426       if (changed_task_number == changed_task_capacity) {
 427         changed_task_capacity *= 2;
 428         changed_tasks = xbt_realloc(changed_tasks, sizeof(SD_task_t) * changed_task_capacity);
 429       }
 430       */
 431       changed_tasks[changed_task_number] = NULL;
 432     }
 433   }
 434
 435   /* main loop */
 436   elapsed_time = 0.0;
 437   while (elapsed_time >= 0.0 &&
 438          (how_long < 0.0 || total_time < how_long) &&
 439          !sd_global->watch_point_reached) {
 440     /* dumb variables */
 441     void *fun = NULL;
 442     void *arg = NULL;
 443
 444
 445     DEBUG1("Total time: %f", total_time);
 446
 447     elapsed_time = surf_solve();
 448     DEBUG1("surf_solve() returns %f", elapsed_time);
 449     if (elapsed_time > 0.0)
 450       total_time += elapsed_time;
 451
 452     /* let's see which tasks are done */
 453     while ((action = xbt_swag_extract(surf_workstation_resource->common_public->states.done_action_set))) {
 454       task = action->data;
 455       INFO1("Task '%s' done", SD_task_get_name(task));
 456       DEBUG0("Calling __SD_task_just_done");
 457       __SD_task_just_done(task);
 458       DEBUG1("__SD_task_just_done called on task '%s'", SD_task_get_name(task));
 459
 460       /* the state has changed */
 461       if (!task->state_changed) {
 462         task->state_changed = 1;
 463         changed_tasks[changed_task_number++] = task;
 464         /*
 465         if (changed_task_number == changed_task_capacity) {
 466           changed_task_capacity *= 2;
 467           changed_tasks = xbt_realloc(changed_tasks, sizeof(SD_task_t) * changed_task_capacity);
 468         }
 469         */
 470         changed_tasks[changed_task_number] = NULL;
 471       }
 472
 473       /* remove the dependencies after this task */
 474       while (xbt_dynar_length(task->tasks_after) > 0) {
 475         xbt_dynar_get_cpy(task->tasks_after, 0, &dependency);
 476         dst = dependency->dst;
 477         SD_task_dependency_remove(task, dst);
 478
 479         /* is dst ready now? */
 480         if (__SD_task_is_ready(dst) && !sd_global->watch_point_reached) {
 481           INFO1("Executing task '%s'", SD_task_get_name(dst));
 482           if (__SD_task_try_to_run(dst)) {
 483             changed_tasks[changed_task_number++] = dst;
 484             /*
 485             if (changed_task_number == changed_task_capacity) {
 486               changed_task_capacity *= 2;
 487               changed_tasks = xbt_realloc(changed_tasks, sizeof(SD_task_t) * changed_task_capacity);
 488             }
 489             */
 490             changed_tasks[changed_task_number] = NULL;
 491           }
 492         }
 493       }
 494     }
 495
 496     /* let's see which tasks have just failed */
 497     while ((action = xbt_swag_extract(surf_workstation_resource->common_public->states.failed_action_set))) {
 498       task = action->data;
 499       INFO1("Task '%s' failed", SD_task_get_name(task));
 500       __SD_task_set_state(task, SD_FAILED);
 501       surf_workstation_resource->common_public->action_free(action);
 502       task->surf_action = NULL;
 503
 504       if (!task->state_changed) {
 505         task->state_changed = 1;
 506         changed_tasks[changed_task_number++] = task;
 507         /*
 508         if (changed_task_number == changed_task_capacity) {
 509           changed_task_capacity *= 2;
 510           changed_tasks = xbt_realloc(changed_tasks, sizeof(SD_task_t) * changed_task_capacity);
 511         }
 512         */
 513         changed_tasks[changed_task_number] = NULL;
 514       }
 515     }
 516
 517     while (surf_timer_resource->extension_public->get(&fun,(void*)&arg)) {
 518     }
 519   }
 520
 521   /* we must reset every task->state_changed */
 522   i = 0;
 523   while (changed_tasks[i] != NULL) {
 524     changed_tasks[i]->state_changed = 0;
 525     i++;
 526   }
 527
 528   INFO0("Simulation finished");
 529   DEBUG3("elapsed_time = %f, total_time = %f, watch_point_reached = %d", elapsed_time, total_time, sd_global->watch_point_reached);
 530   DEBUG1("current time = %f", surf_get_clock());
 531
 532   return changed_tasks;
 533 }
 534
 535 /**
 536  * \brief Returns the current clock
 537  *
 538  * \return the current clock, in second
 539  */
 540 double SD_get_clock(void) {
 541   SD_CHECK_INIT_DONE();
 542
 543   return surf_get_clock();
 544 }
 545
 546 /**
 547  * \brief Destroys all SD internal data
 548  *
 549  * This function should be called when the simulation is over. Don't forget also to destroy
 550  * the tasks.
 551  *
 552  * \see SD_init(), SD_task_destroy()
 553  */
 554 void SD_exit(void) {
 555   if (SD_INITIALISED()) {
 556     DEBUG0("Destroying workstation and link dictionaries...");
 557     xbt_dict_free(&sd_global->workstations);
 558     xbt_dict_free(&sd_global->links);
 559
 560     DEBUG0("Destroying workstation and link arrays if necessary...");
 561     if (sd_global->workstation_list != NULL)
 562       xbt_free(sd_global->workstation_list);
 563
 564     if (sd_global->link_list != NULL)
 565       xbt_free(sd_global->link_list);
 566
 567     if (sd_global->recyclable_route != NULL)
 568       xbt_free(sd_global->recyclable_route);
 569
 570     DEBUG0("Destroying the swags...");
 571     xbt_swag_free(sd_global->not_scheduled_task_set);
 572     xbt_swag_free(sd_global->scheduled_task_set);
 573     xbt_swag_free(sd_global->ready_task_set);
 574     xbt_swag_free(sd_global->in_fifo_task_set);
 575     xbt_swag_free(sd_global->running_task_set);
 576     xbt_swag_free(sd_global->done_task_set);
 577     xbt_swag_free(sd_global->failed_task_set);
 578
 579     xbt_free(sd_global);
 580     sd_global = NULL;
 581
 582     DEBUG0("Exiting Surf...");
 583     surf_exit();
 584   }
 585   else {
 586     WARN0("SD_exit() called, but SimDag is not running");
 587     /* we cannot use exceptions here because xbt is not running! */
 588   }
 589 }