src/surf/cpu_cas01.c

   1 /* Copyright (c) 2009-2011. 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 "surf_private.h"
   8 #include "surf/surf_resource.h"
   9 #include "maxmin_private.h"
  10
  11 surf_model_t surf_cpu_model = NULL;
  12
  13 #undef GENERIC_LMM_ACTION
  14 #undef GENERIC_ACTION
  15 #undef ACTION_GET_CPU
  16 #define GENERIC_LMM_ACTION(action) action->generic_lmm_action
  17 #define GENERIC_ACTION(action) GENERIC_LMM_ACTION(action).generic_action
  18 #define ACTION_GET_CPU(action) ((surf_action_cpu_Cas01_t) action)->cpu
  19
  20 typedef struct surf_action_cpu_cas01 {
  21   s_surf_action_lmm_t generic_lmm_action;
  22 } s_surf_action_cpu_Cas01_t, *surf_action_cpu_Cas01_t;
  23
  24 typedef struct cpu_Cas01 {
  25   s_surf_resource_t generic_resource;
  26   s_xbt_swag_hookup_t modified_cpu_hookup;
  27   double power_peak;
  28   double power_scale;
  29   tmgr_trace_event_t power_event;
  30   int core;
  31   e_surf_resource_state_t state_current;
  32   tmgr_trace_event_t state_event;
  33   lmm_constraint_t constraint;
  34 } s_cpu_Cas01_t, *cpu_Cas01_t;
  35
  36 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu, surf,
  37                                 "Logging specific to the SURF CPU IMPROVED module");
  38
  39
  40
  41 static xbt_swag_t
  42     cpu_running_action_set_that_does_not_need_being_checked = NULL;
  43
  44
  45 static void *cpu_create_resource(const char *name, double power_peak,
  46                                  double power_scale,
  47                                  tmgr_trace_t power_trace,
  48                                  int core,
  49                                  e_surf_resource_state_t state_initial,
  50                                  tmgr_trace_t state_trace,
  51                                  xbt_dict_t cpu_properties)
  52 {
  53   cpu_Cas01_t cpu = NULL;
  54
  55   xbt_assert(!surf_cpu_resource_by_name(name),
  56              "Host '%s' declared several times in the platform file",
  57              name);
  58   cpu = (cpu_Cas01_t) surf_resource_new(sizeof(s_cpu_Cas01_t),
  59                                         surf_cpu_model, name,
  60                                         cpu_properties);
  61   cpu->power_peak = power_peak;
  62   xbt_assert(cpu->power_peak > 0, "Power has to be >0");
  63   cpu->power_scale = power_scale;
  64   cpu->core = core;
  65   xbt_assert(core > 0, "Invalid number of cores %d", core);
  66
  67   if (power_trace)
  68     cpu->power_event =
  69         tmgr_history_add_trace(history, power_trace, 0.0, 0, cpu);
  70
  71   cpu->state_current = state_initial;
  72   if (state_trace)
  73     cpu->state_event =
  74         tmgr_history_add_trace(history, state_trace, 0.0, 0, cpu);
  75
  76   cpu->constraint =
  77       lmm_constraint_new(surf_cpu_model->model_private->maxmin_system, cpu,
  78                          cpu->core * cpu->power_scale * cpu->power_peak);
  79
  80   xbt_lib_set(host_lib, name, SURF_CPU_LEVEL, cpu);
  81
  82   return cpu;
  83 }
  84
  85
  86 static void parse_cpu_init(sg_platf_host_cbarg_t host)
  87 {
  88   cpu_create_resource(host->id,
  89                       host->power_peak,
  90                       host->power_scale,
  91                       host->power_trace,
  92                       host->core_amount,
  93                       host->initial_state,
  94                       host->state_trace, host->properties);
  95 }
  96
  97 static void cpu_add_traces_cpu(void)
  98 {
  99   xbt_dict_cursor_t cursor = NULL;
 100   char *trace_name, *elm;
 101   static int called = 0;
 102   if (called)
 103     return;
 104   called = 1;
 105
 106   /* connect all traces relative to hosts */
 107   xbt_dict_foreach(trace_connect_list_host_avail, cursor, trace_name, elm) {
 108     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 109     cpu_Cas01_t host = surf_cpu_resource_by_name(elm);
 110
 111     xbt_assert(host, "Host %s undefined", elm);
 112     xbt_assert(trace, "Trace %s undefined", trace_name);
 113
 114     host->state_event =
 115         tmgr_history_add_trace(history, trace, 0.0, 0, host);
 116   }
 117
 118   xbt_dict_foreach(trace_connect_list_power, cursor, trace_name, elm) {
 119     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 120     cpu_Cas01_t host = surf_cpu_resource_by_name(elm);
 121
 122     xbt_assert(host, "Host %s undefined", elm);
 123     xbt_assert(trace, "Trace %s undefined", trace_name);
 124
 125     host->power_event =
 126         tmgr_history_add_trace(history, trace, 0.0, 0, host);
 127   }
 128 }
 129
 130 static void cpu_define_callbacks()
 131 {
 132   sg_platf_host_add_cb(parse_cpu_init);
 133   sg_platf_postparse_add_cb(cpu_add_traces_cpu);
 134 }
 135
 136 static int cpu_resource_used(void *resource)
 137 {
 138   return lmm_constraint_used(surf_cpu_model->model_private->maxmin_system,
 139                              ((cpu_Cas01_t) resource)->constraint);
 140 }
 141
 142 static void cpu_update_action_remaining_lazy(surf_action_cpu_Cas01_t action, double now)
 143 {
 144   double delta = 0.0;
 145
 146   xbt_assert(GENERIC_ACTION(action).state_set == surf_cpu_model->states.running_action_set,
 147       "You're updating an action that is not running.");
 148
 149     /* bogus priority, skip it */
 150   xbt_assert(GENERIC_ACTION(action).priority > 0,
 151       "You're updating an action that seems suspended.");
 152
 153   delta = now - GENERIC_LMM_ACTION(action).last_update;
 154   if (GENERIC_ACTION(action).remains > 0) {
 155     XBT_DEBUG("Updating action(%p): remains was %lf, last_update was: %lf", action,
 156         GENERIC_ACTION(action).remains,
 157         GENERIC_LMM_ACTION(action).last_update);
 158     double_update(&(GENERIC_ACTION(action).remains),
 159         GENERIC_LMM_ACTION(action).last_value * delta);
 160
 161 #ifdef HAVE_TRACING
 162     if (TRACE_is_enabled()) {
 163       cpu_Cas01_t cpu =
 164           lmm_constraint_id(lmm_get_cnst_from_var
 165               (surf_cpu_model->model_private->maxmin_system,
 166                   GENERIC_LMM_ACTION(action).variable, 0));
 167       TRACE_surf_host_set_utilization(cpu->generic_resource.name,
 168           ((surf_action_t)action)->category,
 169           GENERIC_LMM_ACTION(action).last_value,
 170           GENERIC_LMM_ACTION(action).last_update,
 171           now - GENERIC_LMM_ACTION(action).last_update);
 172     }
 173 #endif
 174     XBT_DEBUG("Updating action(%p): remains is now %lf", action,
 175     GENERIC_ACTION(action).remains);
 176   }
 177   GENERIC_LMM_ACTION(action).last_update = now;
 178   GENERIC_LMM_ACTION(action).last_value = lmm_variable_getvalue(GENERIC_LMM_ACTION(action).variable);
 179 }
 180
 181 static double cpu_share_resources_lazy(double now)
 182 {
 183   surf_action_cpu_Cas01_t action = NULL;
 184   double min = -1;
 185   double value;
 186
 187   XBT_DEBUG
 188       ("Before share resources, the size of modified actions set is %d",
 189        xbt_swag_size(surf_cpu_model->model_private->modified_set));
 190
 191   lmm_solve(surf_cpu_model->model_private->maxmin_system);
 192
 193   XBT_DEBUG
 194       ("After share resources, The size of modified actions set is %d",
 195        xbt_swag_size(surf_cpu_model->model_private->modified_set));
 196
 197   while((action = xbt_swag_extract(surf_cpu_model->model_private->modified_set))) {
 198     int max_dur_flag = 0;
 199
 200     if (GENERIC_ACTION(action).state_set !=
 201         surf_cpu_model->states.running_action_set)
 202       continue;
 203
 204     /* bogus priority, skip it */
 205     if (GENERIC_ACTION(action).priority <= 0)
 206       continue;
 207
 208     cpu_update_action_remaining_lazy(action,now);
 209
 210     min = -1;
 211     value = lmm_variable_getvalue(GENERIC_LMM_ACTION(action).variable);
 212     if (value > 0) {
 213       if (GENERIC_ACTION(action).remains > 0) {
 214         value = GENERIC_ACTION(action).remains / value;
 215         min = now + value;
 216       } else {
 217         value = 0.0;
 218         min = now;
 219       }
 220     }
 221
 222     if ((GENERIC_ACTION(action).max_duration != NO_MAX_DURATION)
 223         && (min == -1
 224             || GENERIC_ACTION(action).start +
 225             GENERIC_ACTION(action).max_duration < min)) {
 226       min = GENERIC_ACTION(action).start +
 227           GENERIC_ACTION(action).max_duration;
 228       max_dur_flag = 1;
 229     }
 230
 231     XBT_DEBUG("Action(%p) Start %lf Finish %lf Max_duration %lf", action,
 232         GENERIC_ACTION(action).start, now + value,
 233         GENERIC_ACTION(action).max_duration);
 234
 235     if (min != -1) {
 236       surf_action_lmm_heap_remove(surf_cpu_model->model_private->action_heap,(surf_action_lmm_t)action);
 237       surf_action_lmm_heap_insert(surf_cpu_model->model_private->action_heap,(surf_action_lmm_t)action, min, max_dur_flag ? MAX_DURATION : NORMAL);
 238       XBT_DEBUG("Insert at heap action(%p) min %lf now %lf", action, min,
 239                 now);
 240     } else DIE_IMPOSSIBLE;
 241   }
 242
 243   //hereafter must have already the min value for this resource model
 244   if (xbt_heap_size(surf_cpu_model->model_private->action_heap) > 0)
 245     min = xbt_heap_maxkey(surf_cpu_model->model_private->action_heap) - now;
 246   else
 247     min = -1;
 248
 249   XBT_DEBUG("The minimum with the HEAP %lf", min);
 250
 251   return min;
 252 }
 253
 254 static double cpu_share_resources_full(double now)
 255 {
 256   s_surf_action_cpu_Cas01_t action;
 257   return generic_maxmin_share_resources(surf_cpu_model->states.
 258                                         running_action_set,
 259                                         xbt_swag_offset(action,
 260                                                         generic_lmm_action.
 261                                                         variable),
 262                                         surf_cpu_model->model_private->maxmin_system, lmm_solve);
 263 }
 264
 265 static void cpu_update_actions_state_lazy(double now, double delta)
 266 {
 267   surf_action_cpu_Cas01_t action;
 268   while ((xbt_heap_size(surf_cpu_model->model_private->action_heap) > 0)
 269          && (double_equals(xbt_heap_maxkey(surf_cpu_model->model_private->action_heap), now))) {
 270     action = xbt_heap_pop(surf_cpu_model->model_private->action_heap);
 271     XBT_DEBUG("Action %p: finish", action);
 272     GENERIC_ACTION(action).finish = surf_get_clock();
 273 #ifdef HAVE_TRACING
 274     if (TRACE_is_enabled()) {
 275       cpu_Cas01_t cpu =
 276           lmm_constraint_id(lmm_get_cnst_from_var
 277                             (surf_cpu_model->model_private->maxmin_system,
 278                              GENERIC_LMM_ACTION(action).variable, 0));
 279       TRACE_surf_host_set_utilization(cpu->generic_resource.name,
 280                                       ((surf_action_t)action)->category,
 281                                       lmm_variable_getvalue(GENERIC_LMM_ACTION(action).variable),
 282                                       GENERIC_LMM_ACTION(action).last_update,
 283                                       now - GENERIC_LMM_ACTION(action).last_update);
 284     }
 285 #endif
 286     /* set the remains to 0 due to precision problems when updating the remaining amount */
 287     GENERIC_ACTION(action).remains = 0;
 288     surf_action_state_set((surf_action_t) action, SURF_ACTION_DONE);
 289     surf_action_lmm_heap_remove(surf_cpu_model->model_private->action_heap,(surf_action_lmm_t)action); //FIXME: strange call since action was already popped
 290   }
 291 #ifdef HAVE_TRACING
 292   if (TRACE_is_enabled()) {
 293     //defining the last timestamp that we can safely dump to trace file
 294     //without losing the event ascending order (considering all CPU's)
 295     double smaller = -1;
 296     xbt_swag_t running_actions = surf_cpu_model->states.running_action_set;
 297     xbt_swag_foreach(action, running_actions) {
 298         if (smaller < 0) {
 299           smaller = GENERIC_LMM_ACTION(action).last_update;
 300           continue;
 301         }
 302         if (GENERIC_LMM_ACTION(action).last_update < smaller) {
 303           smaller = GENERIC_LMM_ACTION(action).last_update;
 304         }
 305     }
 306     if (smaller > 0) {
 307       TRACE_last_timestamp_to_dump = smaller;
 308     }
 309   }
 310 #endif
 311   return;
 312 }
 313
 314 static void cpu_update_actions_state_full(double now, double delta)
 315 {
 316   surf_action_cpu_Cas01_t action = NULL;
 317   surf_action_cpu_Cas01_t next_action = NULL;
 318   xbt_swag_t running_actions = surf_cpu_model->states.running_action_set;
 319   xbt_swag_foreach_safe(action, next_action, running_actions) {
 320 #ifdef HAVE_TRACING
 321     if (TRACE_is_enabled()) {
 322       cpu_Cas01_t x =
 323           lmm_constraint_id(lmm_get_cnst_from_var
 324                             (surf_cpu_model->model_private->maxmin_system,
 325                              GENERIC_LMM_ACTION(action).variable, 0));
 326
 327       TRACE_surf_host_set_utilization(x->generic_resource.name,
 328                                       ((surf_action_t)action)->category,
 329                                       lmm_variable_getvalue(GENERIC_LMM_ACTION(action).
 330                                        variable),
 331                                       now - delta,
 332                                       delta);
 333       TRACE_last_timestamp_to_dump = now - delta;
 334     }
 335 #endif
 336     double_update(&(GENERIC_ACTION(action).remains),
 337                   lmm_variable_getvalue(GENERIC_LMM_ACTION(action).
 338                                         variable) * delta);
 339     if (GENERIC_LMM_ACTION(action).generic_action.max_duration !=
 340         NO_MAX_DURATION)
 341       double_update(&(GENERIC_ACTION(action).max_duration), delta);
 342     if ((GENERIC_ACTION(action).remains <= 0) &&
 343         (lmm_get_variable_weight(GENERIC_LMM_ACTION(action).variable) >
 344          0)) {
 345       GENERIC_ACTION(action).finish = surf_get_clock();
 346       surf_action_state_set((surf_action_t) action, SURF_ACTION_DONE);
 347     } else if ((GENERIC_ACTION(action).max_duration != NO_MAX_DURATION) &&
 348                (GENERIC_ACTION(action).max_duration <= 0)) {
 349       GENERIC_ACTION(action).finish = surf_get_clock();
 350       surf_action_state_set((surf_action_t) action, SURF_ACTION_DONE);
 351     }
 352   }
 353
 354   return;
 355 }
 356
 357 static void cpu_update_resource_state(void *id,
 358                                       tmgr_trace_event_t event_type,
 359                                       double value, double date)
 360 {
 361   cpu_Cas01_t cpu = id;
 362   lmm_variable_t var = NULL;
 363   lmm_element_t elem = NULL;
 364
 365   if (event_type == cpu->power_event) {
 366     cpu->power_scale = value;
 367     lmm_update_constraint_bound(surf_cpu_model->model_private->maxmin_system, cpu->constraint,
 368                                 cpu->core * cpu->power_scale *
 369                                 cpu->power_peak);
 370 #ifdef HAVE_TRACING
 371     TRACE_surf_host_set_power(date, cpu->generic_resource.name,
 372                               cpu->core * cpu->power_scale *
 373                               cpu->power_peak);
 374 #endif
 375     while ((var = lmm_get_var_from_cnst
 376             (surf_cpu_model->model_private->maxmin_system, cpu->constraint, &elem))) {
 377       surf_action_cpu_Cas01_t action = lmm_variable_id(var);
 378       lmm_update_variable_bound(surf_cpu_model->model_private->maxmin_system,
 379                                 GENERIC_LMM_ACTION(action).variable,
 380                                 cpu->power_scale * cpu->power_peak);
 381     }
 382     if (tmgr_trace_event_free(event_type))
 383       cpu->power_event = NULL;
 384   } else if (event_type == cpu->state_event) {
 385     if (value > 0)
 386       cpu->state_current = SURF_RESOURCE_ON;
 387     else {
 388       lmm_constraint_t cnst = cpu->constraint;
 389
 390       cpu->state_current = SURF_RESOURCE_OFF;
 391
 392       while ((var = lmm_get_var_from_cnst(surf_cpu_model->model_private->maxmin_system, cnst, &elem))) {
 393         surf_action_t action = lmm_variable_id(var);
 394
 395         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 396             surf_action_state_get(action) == SURF_ACTION_READY ||
 397             surf_action_state_get(action) ==
 398             SURF_ACTION_NOT_IN_THE_SYSTEM) {
 399           action->finish = date;
 400           surf_action_state_set(action, SURF_ACTION_FAILED);
 401         }
 402       }
 403     }
 404     if (tmgr_trace_event_free(event_type))
 405       cpu->state_event = NULL;
 406   } else {
 407     XBT_CRITICAL("Unknown event ! \n");
 408     xbt_abort();
 409   }
 410
 411   return;
 412 }
 413
 414 static surf_action_t cpu_execute(void *cpu, double size)
 415 {
 416   surf_action_cpu_Cas01_t action = NULL;
 417   cpu_Cas01_t CPU = cpu;
 418
 419   XBT_IN("(%s,%g)", surf_resource_name(CPU), size);
 420   action =
 421       surf_action_new(sizeof(s_surf_action_cpu_Cas01_t), size,
 422                       surf_cpu_model,
 423                       CPU->state_current != SURF_RESOURCE_ON);
 424
 425   GENERIC_LMM_ACTION(action).suspended = 0;     /* Should be useless because of the
 426                                                    calloc but it seems to help valgrind... */
 427
 428   GENERIC_LMM_ACTION(action).variable =
 429       lmm_variable_new(surf_cpu_model->model_private->maxmin_system, action,
 430                        GENERIC_ACTION(action).priority,
 431                        CPU->power_scale * CPU->power_peak, 1);
 432   if (surf_cpu_model->model_private->update_mechanism == UM_LAZY) {
 433     GENERIC_LMM_ACTION(action).index_heap = -1;
 434     GENERIC_LMM_ACTION(action).last_update = surf_get_clock();
 435     GENERIC_LMM_ACTION(action).last_value = 0.0;
 436   }
 437   lmm_expand(surf_cpu_model->model_private->maxmin_system, CPU->constraint,
 438              GENERIC_LMM_ACTION(action).variable, 1.0);
 439   XBT_OUT();
 440   return (surf_action_t) action;
 441 }
 442
 443 static surf_action_t cpu_action_sleep(void *cpu, double duration)
 444 {
 445   surf_action_cpu_Cas01_t action = NULL;
 446
 447   if (duration > 0)
 448     duration = MAX(duration, MAXMIN_PRECISION);
 449
 450   XBT_IN("(%s,%g)", surf_resource_name(cpu), duration);
 451   action = (surf_action_cpu_Cas01_t) cpu_execute(cpu, 1.0);
 452   // FIXME: sleep variables should not consume 1.0 in lmm_expand
 453   GENERIC_ACTION(action).max_duration = duration;
 454   GENERIC_LMM_ACTION(action).suspended = 2;
 455   if (duration == NO_MAX_DURATION) {
 456     /* Move to the *end* of the corresponding action set. This convention
 457        is used to speed up update_resource_state  */
 458     xbt_swag_remove(action, ((surf_action_t) action)->state_set);
 459     ((surf_action_t) action)->state_set =
 460         cpu_running_action_set_that_does_not_need_being_checked;
 461     xbt_swag_insert(action, ((surf_action_t) action)->state_set);
 462   }
 463
 464   lmm_update_variable_weight(surf_cpu_model->model_private->maxmin_system,
 465                              GENERIC_LMM_ACTION(action).variable, 0.0);
 466   if (surf_cpu_model->model_private->update_mechanism == UM_LAZY) {     // remove action from the heap
 467     surf_action_lmm_heap_remove(surf_cpu_model->model_private->action_heap,(surf_action_lmm_t)action);
 468     // this is necessary for a variable with weight 0 since such
 469     // variables are ignored in lmm and we need to set its max_duration
 470     // correctly at the next call to share_resources
 471     xbt_swag_insert_at_head(action,surf_cpu_model->model_private->modified_set);
 472   }
 473
 474   XBT_OUT();
 475   return (surf_action_t) action;
 476 }
 477
 478 static double cpu_action_get_remains(surf_action_t action)
 479 {
 480   XBT_IN("(%p)", action);
 481   /* update remains before return it */
 482   if (surf_cpu_model->model_private->update_mechanism == UM_LAZY)
 483     cpu_update_action_remaining_lazy((surf_action_cpu_Cas01_t)action,
 484         surf_get_clock());
 485   XBT_OUT();
 486   return action->remains;
 487 }
 488
 489 static e_surf_resource_state_t cpu_get_state(void *cpu)
 490 {
 491   return ((cpu_Cas01_t) cpu)->state_current;
 492 }
 493
 494 static double cpu_get_speed(void *cpu, double load)
 495 {
 496   return load * (((cpu_Cas01_t) cpu)->power_peak);
 497 }
 498
 499 static double cpu_get_available_speed(void *cpu)
 500 {
 501   /* number between 0 and 1 */
 502   return ((cpu_Cas01_t) cpu)->power_scale;
 503 }
 504
 505 static void cpu_finalize(void)
 506 {
 507   lmm_system_free(surf_cpu_model->model_private->maxmin_system);
 508   surf_cpu_model->model_private->maxmin_system = NULL;
 509
 510   if (surf_cpu_model->model_private->action_heap)
 511     xbt_heap_free(surf_cpu_model->model_private->action_heap);
 512   xbt_swag_free(surf_cpu_model->model_private->modified_set);
 513
 514   surf_model_exit(surf_cpu_model);
 515   surf_cpu_model = NULL;
 516
 517   xbt_swag_free(cpu_running_action_set_that_does_not_need_being_checked);
 518   cpu_running_action_set_that_does_not_need_being_checked = NULL;
 519 }
 520
 521 static void surf_cpu_model_init_internal()
 522 {
 523   s_surf_action_t action;
 524   s_surf_action_cpu_Cas01_t comp;
 525
 526   char *optim = xbt_cfg_get_string(_surf_cfg_set, "cpu/optim");
 527   int select =
 528       xbt_cfg_get_int(_surf_cfg_set, "cpu/maxmin_selective_update");
 529
 530   surf_cpu_model = surf_model_init();
 531
 532   if (!strcmp(optim, "Full")) {
 533     surf_cpu_model->model_private->update_mechanism = UM_FULL;
 534     surf_cpu_model->model_private->selective_update = select;
 535   } else if (!strcmp(optim, "Lazy")) {
 536     surf_cpu_model->model_private->update_mechanism = UM_LAZY;
 537     surf_cpu_model->model_private->selective_update = 1;
 538     xbt_assert((select == 1)
 539                ||
 540                (xbt_cfg_is_default_value
 541                 (_surf_cfg_set, "cpu/maxmin_selective_update")),
 542                "Disabling selective update while using the lazy update mechanism is dumb!");
 543   } else {
 544     xbt_die("Unsupported optimization (%s) for this model", optim);
 545   }
 546
 547   cpu_running_action_set_that_does_not_need_being_checked =
 548       xbt_swag_new(xbt_swag_offset(action, state_hookup));
 549
 550   surf_cpu_model->name = "cpu";
 551
 552   surf_cpu_model->action_unref = surf_action_unref;
 553   surf_cpu_model->action_cancel = surf_action_cancel;
 554   surf_cpu_model->action_state_set = surf_action_state_set;
 555
 556   surf_cpu_model->model_private->resource_used = cpu_resource_used;
 557
 558   if (surf_cpu_model->model_private->update_mechanism == UM_LAZY) {
 559     surf_cpu_model->model_private->share_resources =
 560         cpu_share_resources_lazy;
 561     surf_cpu_model->model_private->update_actions_state =
 562         cpu_update_actions_state_lazy;
 563   } else if (surf_cpu_model->model_private->update_mechanism == UM_FULL) {
 564     surf_cpu_model->model_private->share_resources =
 565         cpu_share_resources_full;
 566     surf_cpu_model->model_private->update_actions_state =
 567         cpu_update_actions_state_full;
 568   } else
 569     xbt_die("Invalid cpu update mechanism!");
 570
 571   surf_cpu_model->model_private->update_resource_state =
 572       cpu_update_resource_state;
 573   surf_cpu_model->model_private->finalize = cpu_finalize;
 574
 575   surf_cpu_model->suspend = surf_action_suspend;
 576   surf_cpu_model->resume = surf_action_resume;
 577   surf_cpu_model->is_suspended = surf_action_is_suspended;
 578   surf_cpu_model->set_max_duration = surf_action_set_max_duration;
 579   surf_cpu_model->set_priority = surf_action_set_priority;
 580 #ifdef HAVE_TRACING
 581   surf_cpu_model->set_category = surf_action_set_category;
 582 #endif
 583   surf_cpu_model->get_remains = cpu_action_get_remains;
 584
 585   surf_cpu_model->extension.cpu.execute = cpu_execute;
 586   surf_cpu_model->extension.cpu.sleep = cpu_action_sleep;
 587
 588   surf_cpu_model->extension.cpu.get_state = cpu_get_state;
 589   surf_cpu_model->extension.cpu.get_speed = cpu_get_speed;
 590   surf_cpu_model->extension.cpu.get_available_speed =
 591       cpu_get_available_speed;
 592   surf_cpu_model->extension.cpu.create_resource = cpu_create_resource;
 593   surf_cpu_model->extension.cpu.add_traces = cpu_add_traces_cpu;
 594
 595   if (!surf_cpu_model->model_private->maxmin_system) {
 596     surf_cpu_model->model_private->maxmin_system = lmm_system_new(surf_cpu_model->model_private->selective_update);
 597   }
 598   if (surf_cpu_model->model_private->update_mechanism == UM_LAZY) {
 599     surf_cpu_model->model_private->action_heap = xbt_heap_new(8, NULL);
 600     xbt_heap_set_update_callback(surf_cpu_model->model_private->action_heap,
 601         surf_action_lmm_update_index_heap);
 602     surf_cpu_model->model_private->modified_set =
 603         xbt_swag_new(xbt_swag_offset(comp, generic_lmm_action.action_list_hookup));
 604     surf_cpu_model->model_private->maxmin_system->keep_track = surf_cpu_model->model_private->modified_set;
 605   }
 606 }
 607
 608 /*********************************************************************/
 609 /* Basic sharing model for CPU: that is where all this started... ;) */
 610 /*********************************************************************/
 611 /* @InProceedings{casanova01simgrid, */
 612 /*   author =       "H. Casanova", */
 613 /*   booktitle =    "Proceedings of the IEEE Symposium on Cluster Computing */
 614 /*                  and the Grid (CCGrid'01)", */
 615 /*   publisher =    "IEEE Computer Society", */
 616 /*   title =        "Simgrid: {A} Toolkit for the Simulation of Application */
 617 /*                  Scheduling", */
 618 /*   year =         "2001", */
 619 /*   month =        may, */
 620 /*   note =         "Available at */
 621 /*                  \url{http://grail.sdsc.edu/papers/simgrid_ccgrid01.ps.gz}." */
 622 /* } */
 623
 624 void surf_cpu_model_init_Cas01()
 625 {
 626   char *optim = xbt_cfg_get_string(_surf_cfg_set, "cpu/optim");
 627
 628   if (surf_cpu_model)
 629     return;
 630
 631   if (!strcmp(optim, "TI")) {
 632     surf_cpu_model_init_ti();
 633     return;
 634   }
 635
 636   surf_cpu_model_init_internal();
 637   cpu_define_callbacks();
 638   xbt_dynar_push(model_list, &surf_cpu_model);
 639 }