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
   6 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_kernel, msg,
   7                                 "Logging specific to SimDag (kernel)");
   8
   9 SD_global_t sd_global = NULL;
  10
  11 /* Initialises SD internal data. This function should be called before any other SD function.
  12  */
  13 void SD_init(int *argc, char **argv) {
  14   xbt_assert0(sd_global == NULL, "SD_init already called");
  15
  16   sd_global = xbt_new0(s_SD_global_t, 1);
  17   sd_global->workstations = xbt_dict_new();
  18   sd_global->workstation_count = 0;
  19   sd_global->links = xbt_dict_new();
  20   sd_global->watch_point_reached = 0;
  21
  22   s_SD_task_t task;
  23   sd_global->not_scheduled_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
  24   sd_global->scheduled_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
  25   sd_global->running_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
  26   sd_global->done_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
  27   sd_global->failed_task_set = xbt_swag_new(xbt_swag_offset(task, state_hookup));
  28
  29   surf_init(argc, argv);
  30 }
  31
  32 /* Creates the environnement described in a xml file of a platform description.
  33  */
  34 void SD_create_environment(const char *platform_file) {
  35   xbt_dict_cursor_t cursor = NULL;
  36   char *name = NULL;
  37   void *surf_workstation = NULL;
  38   void *surf_link = NULL;
  39
  40   SD_CHECK_INIT_DONE();
  41
  42   surf_timer_resource_init(platform_file);  /* tell Surf to create the environnement */
  43
  44
  45   /*printf("surf_workstation_resource = %p, workstation_set = %p\n", surf_workstation_resource, workstation_set);
  46     printf("surf_network_resource = %p, network_link_set = %p\n", surf_network_resource, network_link_set);*/
  47
  48   /*surf_workstation_resource_init_KCCFLN05(platform_file);*/
  49   surf_workstation_resource_init_CLM03(platform_file);
  50
  51   /*printf("surf_workstation_resource = %p, workstation_set = %p\n", surf_workstation_resource, workstation_set);
  52     printf("surf_network_resource = %p, network_link_set = %p\n", surf_network_resource, network_link_set);*/
  53
  54
  55   /* now let's create the SD wrappers for workstations and links */
  56   xbt_dict_foreach(workstation_set, cursor, name, surf_workstation) {
  57     __SD_workstation_create(surf_workstation, NULL);
  58   }
  59
  60   xbt_dict_foreach(network_link_set, cursor, name, surf_link) {
  61     __SD_link_create(surf_link, NULL);
  62   }
  63 }
  64
  65 /* Launches the simulation. Returns a NULL-terminated array of SD_task_t whose state has changed.
  66  */
  67 SD_task_t* SD_simulate(double how_long)
  68 {
  69   /* TODO */
  70
  71   double total_time = 0.0; /* we stop the simulation when total_time >= how_long */
  72   double elapsed_time = 0.0;
  73   SD_task_t task;
  74   surf_action_t action;
  75   SD_task_t *changed_tasks = NULL;
  76   int changed_task_number = 0;
  77   int changed_task_capacity = 16;
  78
  79   /* create the array that will be returned */
  80   changed_tasks = xbt_new0(SD_task_t, changed_task_capacity); /* changed_task_capacity will be increased if necessary */
  81   changed_tasks[0] = NULL;
  82
  83   surf_solve(); /* Takes traces into account. Returns 0.0 */
  84
  85   sd_global->watch_point_reached = 0;
  86
  87   /* main loop */
  88   while (elapsed_time >= 0.0 && total_time < how_long && !sd_global->watch_point_reached) {
  89
  90     /* explore the scheduled tasks */
  91     xbt_swag_foreach(task, sd_global->scheduled_task_set) {
  92       INFO1("Examining task '%s'...", SD_task_get_name(task));
  93       task->state_changed = 0;
  94       if (xbt_dynar_length(task->tasks_before) == 0) {
  95         INFO1("The dependencies are satisfied. Executing task '%s'", SD_task_get_name(task));
  96         action = __SD_task_run(task);
  97         surf_workstation_resource->common_public->action_set_data(action, task);
  98         task->state_changed = 1;
  99
 100         changed_tasks[changed_task_number++] = task; /* replace NULL by the task */
 101         if (changed_task_number == changed_task_capacity) {
 102           changed_task_capacity *= 2;
 103           changed_tasks = xbt_realloc(changed_tasks, sizeof(SD_task_t) * changed_task_capacity);
 104         }
 105         changed_tasks[changed_task_number] = NULL;
 106       }
 107       else {
 108         INFO1("Cannot execute task '%s' now because some depencies are not satisfied.", SD_task_get_name(task));
 109       }
 110     }
 111
 112     elapsed_time = surf_solve();
 113     if (elapsed_time > 0.0)
 114       total_time += elapsed_time;
 115     /*    INFO1("Total time: %f", total_time);*/
 116
 117     while ((action = xbt_swag_extract(surf_workstation_resource->common_public->states.done_action_set))) {
 118       task = action->data;
 119       INFO1("Task '%s' done", SD_task_get_name(task));
 120       __SD_task_set_state(task, SD_DONE);
 121       __SD_task_remove_dependencies(task);
 122       if (!task->state_changed) {
 123         task->state_changed = 1;
 124         changed_tasks[changed_task_number++] = task;
 125       }
 126     }
 127
 128     while ((action = xbt_swag_extract(surf_workstation_resource->common_public->states.failed_action_set))) {
 129       task = action->data;
 130       INFO1("Task '%s' failed", SD_task_get_name(task));
 131       __SD_task_set_state(task, SD_FAILED);
 132       if (!task->state_changed) {
 133         task->state_changed = 1;
 134         changed_tasks[changed_task_number++] = task;
 135       }
 136     }
 137   }
 138
 139   INFO0("Simulation finished");
 140
 141   INFO1("Number of tasks whose state has changed: %d", changed_task_number);
 142   return changed_tasks;
 143 }
 144
 145 /* Destroys all SD internal data. This function should be called when the simulation is over.
 146  * The tasks should have been destroyed first.
 147  */
 148 void SD_exit(void) {
 149   if (sd_global != NULL) {
 150     xbt_dict_free(&sd_global->workstations);
 151     xbt_dict_free(&sd_global->links);
 152     xbt_free(sd_global);
 153
 154     xbt_swag_free(sd_global->not_scheduled_task_set);
 155     xbt_swag_free(sd_global->scheduled_task_set);
 156     xbt_swag_free(sd_global->running_task_set);
 157     xbt_swag_free(sd_global->done_task_set);
 158     xbt_swag_free(sd_global->failed_task_set);
 159
 160     surf_exit();
 161   }
 162 }