src/surf/cpu_ti.c

   1
   2 /* Copyright (c) 2009, 2010. The SimGrid Team.
   3  * All rights reserved.                                                     */
   4
   5 /* This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the license (GNU LGPL) which comes with this package. */
   7
   8 /*
   9   commit: e2d6799c4182f00443b3013aadb1c2412372460f
  10   This commit retrieves the old implementation of CPU_TI with multi-levels.
  11 */
  12
  13 #include "surf_private.h"
  14 #include "trace_mgr_private.h"
  15 #include "cpu_ti_private.h"
  16 #include "xbt/heap.h"
  17 #include "surf/surf_resource.h"
  18
  19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu_ti, surf,
  20                                 "Logging specific to the SURF CPU TRACE INTEGRATION module");
  21
  22
  23 static xbt_swag_t
  24     cpu_ti_running_action_set_that_does_not_need_being_checked = NULL;
  25 static xbt_swag_t cpu_ti_modified_cpu = NULL;
  26 static xbt_heap_t cpu_ti_action_heap;
  27
  28 /* prototypes of new trace functions */
  29 static double surf_cpu_ti_integrate_trace(surf_cpu_ti_tgmr_t trace,
  30                                           double a, double b);
  31
  32
  33 static double surf_cpu_ti_solve_trace(surf_cpu_ti_tgmr_t trace, double a,
  34                                       double amount);
  35 static double surf_cpu_ti_solve_trace_somewhat_simple(surf_cpu_ti_tgmr_t
  36                                                       trace, double a,
  37                                                       double amount);
  38
  39 static void surf_cpu_ti_free_tmgr(surf_cpu_ti_tgmr_t trace);
  40
  41 static double surf_cpu_ti_integrate_trace_simple(surf_cpu_ti_trace_t trace,
  42                                                  double a, double b);
  43 static double surf_cpu_ti_integrate_trace_simple_point(surf_cpu_ti_trace_t
  44                                                        trace, double a);
  45 static double surf_cpu_ti_solve_trace_simple(surf_cpu_ti_trace_t trace,
  46                                              double a, double amount);
  47 static int surf_cpu_ti_binary_search(double *array, double a, int low,
  48                                      int high);
  49 /* end prototypes */
  50
  51 static void surf_cpu_ti_free_trace(surf_cpu_ti_trace_t trace)
  52 {
  53   xbt_free(trace->time_points);
  54   xbt_free(trace->integral);
  55   xbt_free(trace);
  56 }
  57
  58 static void surf_cpu_ti_free_tmgr(surf_cpu_ti_tgmr_t trace)
  59 {
  60   if (trace->trace)
  61     surf_cpu_ti_free_trace(trace->trace);
  62   xbt_free(trace);
  63 }
  64
  65 static surf_cpu_ti_trace_t surf_cpu_ti_trace_new(tmgr_trace_t power_trace)
  66 {
  67   surf_cpu_ti_trace_t trace;
  68   s_tmgr_event_t val;
  69   unsigned int cpt;
  70   double integral = 0;
  71   double time = 0;
  72   int i = 0;
  73   trace = xbt_new0(s_surf_cpu_ti_trace_t, 1);
  74   trace->time_points =
  75       xbt_malloc0(sizeof(double) *
  76                   (xbt_dynar_length(power_trace->s_list.event_list) + 1));
  77   trace->integral =
  78       xbt_malloc0(sizeof(double) *
  79                   (xbt_dynar_length(power_trace->s_list.event_list) + 1));
  80   trace->nb_points = xbt_dynar_length(power_trace->s_list.event_list);
  81   xbt_dynar_foreach(power_trace->s_list.event_list, cpt, val) {
  82     trace->time_points[i] = time;
  83     trace->integral[i] = integral;
  84     integral += val.delta * val.value;
  85     time += val.delta;
  86     i++;
  87   }
  88   trace->time_points[i] = time;
  89   trace->integral[i] = integral;
  90   return trace;
  91 }
  92
  93 /**
  94 * \brief Creates a new integration trace from a tmgr_trace_t
  95 *
  96 * \param  power_trace    CPU availability trace
  97 * \param  value          Percentage of CPU power available (useful to fixed tracing)
  98 * \param  spacing        Initial spacing
  99 * \return  Integration trace structure
 100 */
 101 static surf_cpu_ti_tgmr_t cpu_ti_parse_trace(tmgr_trace_t power_trace,
 102                                              double value)
 103 {
 104   surf_cpu_ti_tgmr_t trace;
 105   double total_time = 0.0;
 106   s_tmgr_event_t val;
 107   unsigned int cpt;
 108   trace = xbt_new0(s_surf_cpu_ti_tgmr_t, 1);
 109
 110 /* no availability file, fixed trace */
 111   if (!power_trace) {
 112     trace->type = TRACE_FIXED;
 113     trace->value = value;
 114     XBT_DEBUG("No availabily trace. Constant value = %lf", value);
 115     return trace;
 116   }
 117
 118   /* only one point available, fixed trace */
 119   if (xbt_dynar_length(power_trace->s_list.event_list) == 1) {
 120     xbt_dynar_get_cpy(power_trace->s_list.event_list, 0, &val);
 121     trace->type = TRACE_FIXED;
 122     trace->value = val.value;
 123     return trace;
 124   }
 125
 126   trace->type = TRACE_DYNAMIC;
 127   trace->power_trace = power_trace;
 128
 129   /* count the total time of trace file */
 130   xbt_dynar_foreach(power_trace->s_list.event_list, cpt, val) {
 131     total_time += val.delta;
 132   }
 133   trace->trace = surf_cpu_ti_trace_new(power_trace);
 134   trace->last_time = total_time;
 135   trace->total =
 136       surf_cpu_ti_integrate_trace_simple(trace->trace, 0, total_time);
 137
 138   XBT_DEBUG("Total integral %lf, last_time %lf ",
 139          trace->total, trace->last_time);
 140
 141   return trace;
 142 }
 143
 144
 145 static void* cpu_ti_create_resource(const char *name, double power_peak,
 146                            double power_scale,
 147                            tmgr_trace_t power_trace,
 148                            int core,
 149                            e_surf_resource_state_t state_initial,
 150                            tmgr_trace_t state_trace,
 151                            xbt_dict_t cpu_properties,
 152                            surf_model_t cpu_model)
 153 {
 154   tmgr_trace_t empty_trace;
 155   s_tmgr_event_t val;
 156   cpu_ti_t cpu = NULL;
 157   s_surf_action_cpu_ti_t ti_action;
 158   xbt_assert(core==1,"Multi-core not handled with this model yet");
 159   xbt_assert(!surf_cpu_resource_priv(surf_cpu_resource_by_name(name)),
 160               "Host '%s' declared several times in the platform file",
 161               name);
 162   xbt_assert(core==1,"Multi-core not handled with this model yet");
 163   cpu = (cpu_ti_t) surf_resource_new(sizeof(s_cpu_ti_t),
 164           cpu_model, name,cpu_properties);
 165   cpu->action_set =
 166       xbt_swag_new(xbt_swag_offset(ti_action, cpu_list_hookup));
 167   cpu->power_peak = power_peak;
 168   xbt_assert(cpu->power_peak > 0, "Power has to be >0");
 169   XBT_DEBUG("power scale %lf", power_scale);
 170   cpu->power_scale = power_scale;
 171   cpu->avail_trace = cpu_ti_parse_trace(power_trace, power_scale);
 172   cpu->state_current = state_initial;
 173   if (state_trace)
 174     cpu->state_event =
 175         tmgr_history_add_trace(history, state_trace, 0.0, 0, cpu);
 176   if (power_trace && xbt_dynar_length(power_trace->s_list.event_list) > 1) {
 177     /* add a fake trace event if periodicity == 0 */
 178     xbt_dynar_get_cpy(power_trace->s_list.event_list,
 179                       xbt_dynar_length(power_trace->s_list.event_list) - 1, &val);
 180     if (val.delta == 0) {
 181       empty_trace = tmgr_empty_trace_new();
 182       cpu->power_event =
 183           tmgr_history_add_trace(history, empty_trace,
 184                                  cpu->avail_trace->last_time, 0, cpu);
 185     }
 186   }
 187   xbt_lib_set(host_lib, name, SURF_CPU_LEVEL, cpu);
 188
 189   return xbt_lib_get_elm_or_null(host_lib, name);
 190 }
 191
 192
 193 static void parse_cpu_ti_init(sg_platf_host_cbarg_t host)
 194 {
 195   cpu_ti_create_resource(host->id,
 196         host->power_peak,
 197         host->power_scale,
 198         host->power_trace,
 199         host->core_amount,
 200         host->initial_state,
 201         host->state_trace,
 202         host->properties,
 203         surf_cpu_model_pm);
 204
 205 }
 206
 207 static void add_traces_cpu_ti(void)
 208 {
 209   xbt_dict_cursor_t cursor = NULL;
 210   char *trace_name, *elm;
 211
 212   static int called = 0;
 213
 214   if (called)
 215     return;
 216   called = 1;
 217
 218 /* connect all traces relative to hosts */
 219   xbt_dict_foreach(trace_connect_list_host_avail, cursor, trace_name, elm) {
 220     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 221     cpu_ti_t cpu = surf_cpu_resource_priv(surf_cpu_resource_by_name(elm));
 222
 223     xbt_assert(cpu, "Host %s undefined", elm);
 224     xbt_assert(trace, "Trace %s undefined", trace_name);
 225
 226     if (cpu->state_event) {
 227       XBT_DEBUG("Trace already configured for this CPU(%s), ignoring it",
 228              elm);
 229       continue;
 230     }
 231     XBT_DEBUG("Add state trace: %s to CPU(%s)", trace_name, elm);
 232     cpu->state_event = tmgr_history_add_trace(history, trace, 0.0, 0, cpu);
 233   }
 234
 235   xbt_dict_foreach(trace_connect_list_power, cursor, trace_name, elm) {
 236     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 237     cpu_ti_t cpu = surf_cpu_resource_priv(surf_cpu_resource_by_name(elm));
 238
 239     xbt_assert(cpu, "Host %s undefined", elm);
 240     xbt_assert(trace, "Trace %s undefined", trace_name);
 241
 242     XBT_DEBUG("Add power trace: %s to CPU(%s)", trace_name, elm);
 243     if (cpu->avail_trace)
 244       surf_cpu_ti_free_tmgr(cpu->avail_trace);
 245
 246     cpu->avail_trace = cpu_ti_parse_trace(trace, cpu->power_scale);
 247
 248     /* add a fake trace event if periodicity == 0 */
 249     if (trace && xbt_dynar_length(trace->s_list.event_list) > 1) {
 250       s_tmgr_event_t val;
 251       xbt_dynar_get_cpy(trace->s_list.event_list,
 252                         xbt_dynar_length(trace->s_list.event_list) - 1, &val);
 253       if (val.delta == 0) {
 254         tmgr_trace_t empty_trace;
 255         empty_trace = tmgr_empty_trace_new();
 256         cpu->power_event =
 257             tmgr_history_add_trace(history, empty_trace,
 258                                    cpu->avail_trace->last_time, 0, cpu);
 259       }
 260     }
 261   }
 262 }
 263
 264 static void cpu_ti_define_callbacks()
 265 {
 266   sg_platf_host_add_cb(parse_cpu_ti_init);
 267   sg_platf_postparse_add_cb(add_traces_cpu_ti);
 268 }
 269
 270 static int cpu_ti_resource_used(void *resource_id)
 271 {
 272   cpu_ti_t cpu = resource_id;
 273   return xbt_swag_size(cpu->action_set);
 274 }
 275
 276 static int cpu_ti_action_unref(surf_action_t action)
 277 {
 278   action->refcount--;
 279   if (!action->refcount) {
 280     xbt_swag_remove(action, action->state_set);
 281     /* remove from action_set */
 282     xbt_swag_remove(action, ((cpu_ti_t)surf_cpu_resource_priv(ACTION_GET_CPU(action)))->action_set);
 283     /* remove from heap */
 284     xbt_heap_remove(cpu_ti_action_heap,
 285                     ((surf_action_cpu_ti_t) action)->index_heap);
 286     xbt_swag_insert(((cpu_ti_t)surf_cpu_resource_priv(ACTION_GET_CPU(action))), cpu_ti_modified_cpu);
 287     surf_action_free(&action);
 288     return 1;
 289   }
 290   return 0;
 291 }
 292
 293 static void cpu_ti_action_cancel(surf_action_t action)
 294 {
 295   surf_action_state_set(action, SURF_ACTION_FAILED);
 296   xbt_heap_remove(cpu_ti_action_heap,
 297                   ((surf_action_cpu_ti_t) action)->index_heap);
 298   xbt_swag_insert(surf_cpu_resource_priv(ACTION_GET_CPU(action)), cpu_ti_modified_cpu);
 299   return;
 300 }
 301
 302 static void cpu_ti_action_state_set(surf_action_t action,
 303                                     e_surf_action_state_t state)
 304 {
 305   surf_action_state_set(action, state);
 306   xbt_swag_insert(surf_cpu_resource_priv(ACTION_GET_CPU(action)), cpu_ti_modified_cpu);
 307   return;
 308 }
 309
 310 /**
 311 * \brief Update the remaining amount of actions
 312 *
 313 * \param  cpu    Cpu on which the actions are running
 314 * \param  now    Current time
 315 */
 316 static void cpu_ti_update_remaining_amount(surf_model_t cpu_model, cpu_ti_t cpu, double now)
 317 {
 318   double area_total;
 319   surf_action_cpu_ti_t action;
 320
 321 /* already updated */
 322   if (cpu->last_update >= now)
 323     return;
 324
 325 /* calcule the surface */
 326   area_total =
 327       surf_cpu_ti_integrate_trace(cpu->avail_trace, cpu->last_update,
 328                                   now) * cpu->power_peak;
 329   XBT_DEBUG("Flops total: %lf, Last update %lf", area_total,
 330          cpu->last_update);
 331
 332   xbt_swag_foreach(action, cpu->action_set) {
 333     surf_action_t generic = (surf_action_t)action;
 334     /* action not running, skip it */
 335     if (generic->state_set !=
 336         cpu_model->states.running_action_set)
 337       continue;
 338
 339     /* bogus priority, skip it */
 340     if (generic->priority <= 0)
 341       continue;
 342
 343     /* action suspended, skip it */
 344     if (action->suspended != 0)
 345       continue;
 346
 347     /* action don't need update */
 348     if (generic->start >= now)
 349       continue;
 350
 351     /* skip action that are finishing now */
 352     if (generic->finish >= 0
 353         && generic->finish <= now)
 354       continue;
 355
 356     /* update remaining */
 357     double_update(&(generic->remains),
 358                   area_total / (cpu->sum_priority *
 359                                 generic->priority));
 360     XBT_DEBUG("Update remaining action(%p) remaining %lf", action,
 361            generic->remains);
 362   }
 363   cpu->last_update = now;
 364 #undef GENERIC_ACTION
 365 }
 366
 367 /**
 368 * \brief Update the finish date of action if necessary
 369 *
 370 * \param  cpu    Cpu on which the actions are running
 371 * \param  now    Current time
 372 */
 373 static void cpu_ti_update_action_finish_date(surf_model_t cpu_model, cpu_ti_t cpu, double now)
 374 {
 375 #define GENERIC_ACTION(action) action->generic_action
 376   surf_action_cpu_ti_t action;
 377   double sum_priority = 0.0, total_area, min_finish = -1;
 378
 379 /* update remaning amount of actions */
 380   cpu_ti_update_remaining_amount(cpu_model, cpu, now);
 381
 382   xbt_swag_foreach(action, cpu->action_set) {
 383     /* action not running, skip it */
 384     if (GENERIC_ACTION(action).state_set !=
 385         cpu_model->states.running_action_set)
 386       continue;
 387
 388     /* bogus priority, skip it */
 389     if (GENERIC_ACTION(action).priority <= 0)
 390       continue;
 391
 392     /* action suspended, skip it */
 393     if (action->suspended != 0)
 394       continue;
 395
 396     sum_priority += 1.0 / GENERIC_ACTION(action).priority;
 397   }
 398   cpu->sum_priority = sum_priority;
 399
 400   xbt_swag_foreach(action, cpu->action_set) {
 401     min_finish = -1;
 402     /* action not running, skip it */
 403     if (GENERIC_ACTION(action).state_set !=
 404         cpu_model->states.running_action_set)
 405       continue;
 406
 407     /* verify if the action is really running on cpu */
 408     if (action->suspended == 0 && GENERIC_ACTION(action).priority > 0) {
 409       /* total area needed to finish the action. Used in trace integration */
 410       total_area =
 411           (GENERIC_ACTION(action).remains) * sum_priority *
 412           GENERIC_ACTION(action).priority;
 413
 414       total_area /= cpu->power_peak;
 415
 416       GENERIC_ACTION(action).finish =
 417           surf_cpu_ti_solve_trace(cpu->avail_trace, now, total_area);
 418       /* verify which event will happen before (max_duration or finish time) */
 419       if ((GENERIC_ACTION(action).max_duration != NO_MAX_DURATION) &&
 420           (GENERIC_ACTION(action).start +
 421            GENERIC_ACTION(action).max_duration <
 422            GENERIC_ACTION(action).finish))
 423         min_finish = GENERIC_ACTION(action).start +
 424             GENERIC_ACTION(action).max_duration;
 425       else
 426         min_finish = GENERIC_ACTION(action).finish;
 427     } else {
 428       /* put the max duration time on heap */
 429       if (GENERIC_ACTION(action).max_duration != NO_MAX_DURATION)
 430         min_finish =
 431             (GENERIC_ACTION(action).start +
 432              GENERIC_ACTION(action).max_duration);
 433     }
 434     /* add in action heap */
 435     XBT_DEBUG("action(%p) index %d", action, action->index_heap);
 436     if (action->index_heap >= 0) {
 437       surf_action_cpu_ti_t heap_act =
 438           xbt_heap_remove(cpu_ti_action_heap, action->index_heap);
 439       if (heap_act != action)
 440         DIE_IMPOSSIBLE;
 441     }
 442     if (min_finish != NO_MAX_DURATION)
 443       xbt_heap_push(cpu_ti_action_heap, action, min_finish);
 444
 445     XBT_DEBUG
 446         ("Update finish time: Cpu(%s) Action: %p, Start Time: %lf Finish Time: %lf Max duration %lf",
 447          cpu->generic_resource.name, action, GENERIC_ACTION(action).start,
 448          GENERIC_ACTION(action).finish,
 449          GENERIC_ACTION(action).max_duration);
 450   }
 451 /* remove from modified cpu */
 452   xbt_swag_remove(cpu, cpu_ti_modified_cpu);
 453 #undef GENERIC_ACTION
 454 }
 455
 456 static double cpu_ti_share_resources(surf_model_t cpu_model, double now)
 457 {
 458   cpu_ti_t cpu, cpu_next;
 459   double min_action_duration = -1;
 460
 461 /* iterates over modified cpus to update share resources */
 462   xbt_swag_foreach_safe(cpu, cpu_next, cpu_ti_modified_cpu) {
 463     /* FIXME: cpu_ti_modified_cpu is a global object. But, now we have multiple
 464      * cpu_model objects in the system. Do we have to create this
 465      * swag for each cpu model object?
 466      *
 467      * We should revisit here after we know what cpu_ti is.
 468      **/
 469     cpu_ti_update_action_finish_date(cpu_model, cpu, now);
 470   }
 471 /* get the min next event if heap not empty */
 472   if (xbt_heap_size(cpu_ti_action_heap) > 0)
 473     min_action_duration = xbt_heap_maxkey(cpu_ti_action_heap) - now;
 474
 475   XBT_DEBUG("Share resources, min next event date: %lf", min_action_duration);
 476
 477   return min_action_duration;
 478 }
 479
 480 static void cpu_ti_update_actions_state(surf_model_t cpu_model, double now, double delta)
 481 {
 482   /* FIXME: cpu_ti_action_heap is global. Is this okay for VM support? */
 483
 484 #define GENERIC_ACTION(action) action->generic_action
 485   surf_action_cpu_ti_t action;
 486   while ((xbt_heap_size(cpu_ti_action_heap) > 0)
 487          && (xbt_heap_maxkey(cpu_ti_action_heap) <= now)) {
 488     action = xbt_heap_pop(cpu_ti_action_heap);
 489     XBT_DEBUG("Action %p: finish", action);
 490     GENERIC_ACTION(action).finish = surf_get_clock();
 491     /* set the remains to 0 due to precision problems when updating the remaining amount */
 492     GENERIC_ACTION(action).remains = 0;
 493     cpu_ti_action_state_set((surf_action_t) action, SURF_ACTION_DONE);
 494     /* update remaining amout of all actions */
 495     cpu_ti_update_remaining_amount(cpu_model, surf_cpu_resource_priv(action->cpu), surf_get_clock());
 496   }
 497 #undef GENERIC_ACTION
 498 }
 499
 500 static void cpu_ti_update_resource_state(void *id,
 501                                          tmgr_trace_event_t event_type,
 502                                          double value, double date)
 503 {
 504   cpu_ti_t cpu = id;
 505   surf_model_t cpu_model = ((surf_resource_t) cpu)->model;
 506   surf_action_cpu_ti_t action;
 507
 508   surf_watched_hosts();
 509
 510   if (event_type == cpu->power_event) {
 511     tmgr_trace_t power_trace;
 512     surf_cpu_ti_tgmr_t trace;
 513     s_tmgr_event_t val;
 514
 515     XBT_DEBUG("Finish trace date: %lf value %lf date %lf", surf_get_clock(),
 516            value, date);
 517     /* update remaining of actions and put in modified cpu swag */
 518     cpu_ti_update_remaining_amount(cpu_model, cpu, date);
 519     xbt_swag_insert(cpu, cpu_ti_modified_cpu);
 520
 521     power_trace = cpu->avail_trace->power_trace;
 522     xbt_dynar_get_cpy(power_trace->s_list.event_list,
 523                       xbt_dynar_length(power_trace->s_list.event_list) - 1, &val);
 524     /* free old trace */
 525     surf_cpu_ti_free_tmgr(cpu->avail_trace);
 526     cpu->power_scale = val.value;
 527
 528     trace = xbt_new0(s_surf_cpu_ti_tgmr_t, 1);
 529     trace->type = TRACE_FIXED;
 530     trace->value = val.value;
 531     XBT_DEBUG("value %lf", val.value);
 532
 533     cpu->avail_trace = trace;
 534
 535     if (tmgr_trace_event_free(event_type))
 536       cpu->power_event = NULL;
 537
 538   } else if (event_type == cpu->state_event) {
 539     if (value > 0)
 540       cpu->state_current = SURF_RESOURCE_ON;
 541     else {
 542       cpu->state_current = SURF_RESOURCE_OFF;
 543
 544       /* put all action running on cpu to failed */
 545       xbt_swag_foreach(action, cpu->action_set) {
 546         if (surf_action_state_get((surf_action_t) action) ==
 547             SURF_ACTION_RUNNING
 548             || surf_action_state_get((surf_action_t) action) ==
 549             SURF_ACTION_READY
 550             || surf_action_state_get((surf_action_t) action) ==
 551             SURF_ACTION_NOT_IN_THE_SYSTEM) {
 552           action->generic_action.finish = date;
 553           cpu_ti_action_state_set((surf_action_t) action,
 554                                   SURF_ACTION_FAILED);
 555           if (action->index_heap >= 0) {
 556             surf_action_cpu_ti_t heap_act =
 557                 xbt_heap_remove(cpu_ti_action_heap, action->index_heap);
 558             if (heap_act != action)
 559               DIE_IMPOSSIBLE;
 560           }
 561         }
 562       }
 563     }
 564     if (tmgr_trace_event_free(event_type))
 565       cpu->state_event = NULL;
 566   } else {
 567     XBT_CRITICAL("Unknown event ! \n");
 568     xbt_abort();
 569   }
 570
 571   return;
 572 }
 573
 574 static surf_action_t cpu_ti_execute(void *cpu, double size)
 575 {
 576   surf_action_cpu_ti_t action = NULL;
 577   cpu_ti_t CPU = surf_cpu_resource_priv(cpu);
 578   surf_model_t cpu_model = ((surf_resource_t) CPU)->model;
 579
 580   XBT_IN("(%s,%g)", surf_resource_name(CPU), size);
 581   action =
 582       surf_action_new(sizeof(s_surf_action_cpu_ti_t), size, cpu_model,
 583                       CPU->state_current != SURF_RESOURCE_ON);
 584   action->cpu = cpu;
 585   action->index_heap = -1;
 586
 587   xbt_swag_insert(CPU, cpu_ti_modified_cpu);
 588
 589   xbt_swag_insert(action, CPU->action_set);
 590
 591   action->suspended = 0;        /* Should be useless because of the
 592                                    calloc but it seems to help valgrind... */
 593
 594   XBT_OUT();
 595   return (surf_action_t) action;
 596 }
 597
 598 static void cpu_ti_action_update_index_heap(void *action, int i)
 599 {
 600   ((surf_action_cpu_ti_t) action)->index_heap = i;
 601 }
 602
 603 static surf_action_t cpu_ti_action_sleep(void *cpu, double duration)
 604 {
 605   surf_action_cpu_ti_t action = NULL;
 606
 607   if (duration > 0)
 608     duration = MAX(duration, MAXMIN_PRECISION);
 609
 610   XBT_IN("(%s,%g)", surf_resource_name(surf_cpu_resource_priv(cpu)), duration);
 611   action = (surf_action_cpu_ti_t) cpu_ti_execute(cpu, 1.0);
 612   action->generic_action.max_duration = duration;
 613   action->suspended = 2;
 614   if (duration == NO_MAX_DURATION) {
 615     /* Move to the *end* of the corresponding action set. This convention
 616        is used to speed up update_resource_state  */
 617     xbt_swag_remove(action, ((surf_action_t) action)->state_set);
 618     ((surf_action_t) action)->state_set =
 619         cpu_ti_running_action_set_that_does_not_need_being_checked;
 620     xbt_swag_insert(action, ((surf_action_t) action)->state_set);
 621   }
 622   XBT_OUT();
 623   return (surf_action_t) action;
 624 }
 625
 626 static void cpu_ti_action_suspend(surf_action_t action)
 627 {
 628   XBT_IN("(%p)", action);
 629   if (((surf_action_cpu_ti_t) action)->suspended != 2) {
 630     ((surf_action_cpu_ti_t) action)->suspended = 1;
 631     xbt_heap_remove(cpu_ti_action_heap,
 632                     ((surf_action_cpu_ti_t) action)->index_heap);
 633     xbt_swag_insert(surf_cpu_resource_priv(ACTION_GET_CPU(action)), cpu_ti_modified_cpu);
 634   }
 635   XBT_OUT();
 636 }
 637
 638 static void cpu_ti_action_resume(surf_action_t action)
 639 {
 640   XBT_IN("(%p)", action);
 641   if (((surf_action_cpu_ti_t) action)->suspended != 2) {
 642     ((surf_action_cpu_ti_t) action)->suspended = 0;
 643     xbt_swag_insert(surf_cpu_resource_priv(ACTION_GET_CPU(action)), cpu_ti_modified_cpu);
 644   }
 645   XBT_OUT();
 646 }
 647
 648 static int cpu_ti_action_is_suspended(surf_action_t action)
 649 {
 650   return (((surf_action_cpu_ti_t) action)->suspended == 1);
 651 }
 652
 653 static void cpu_ti_action_set_max_duration(surf_action_t action,
 654                                            double duration)
 655 {
 656   surf_action_cpu_ti_t ACT = (surf_action_cpu_ti_t) action;
 657   double min_finish;
 658
 659   XBT_IN("(%p,%g)", action, duration);
 660
 661   action->max_duration = duration;
 662
 663   if (duration >= 0)
 664     min_finish =
 665         (action->start + action->max_duration) <
 666         action->finish ? (action->start +
 667                           action->max_duration) : action->finish;
 668   else
 669     min_finish = action->finish;
 670
 671 /* add in action heap */
 672   if (ACT->index_heap >= 0) {
 673     surf_action_cpu_ti_t heap_act =
 674         xbt_heap_remove(cpu_ti_action_heap, ACT->index_heap);
 675     if (heap_act != ACT)
 676       DIE_IMPOSSIBLE;
 677   }
 678   xbt_heap_push(cpu_ti_action_heap, ACT, min_finish);
 679
 680   XBT_OUT();
 681 }
 682
 683 static void cpu_ti_action_set_priority(surf_action_t action,
 684                                        double priority)
 685 {
 686   XBT_IN("(%p,%g)", action, priority);
 687   action->priority = priority;
 688   xbt_swag_insert(surf_cpu_resource_priv(ACTION_GET_CPU(action)), cpu_ti_modified_cpu);
 689   XBT_OUT();
 690 }
 691
 692 static double cpu_ti_action_get_remains(surf_action_t action)
 693 {
 694   surf_model_t cpu_model = action->model_obj;
 695   XBT_IN("(%p)", action);
 696
 697   cpu_ti_update_remaining_amount(cpu_model, (cpu_ti_t) ((surf_action_cpu_ti_t) action)->cpu,
 698                                  surf_get_clock());
 699   XBT_OUT();
 700   return action->remains;
 701 }
 702
 703 static e_surf_resource_state_t cpu_ti_get_state(void *cpu)
 704 {
 705   return ((cpu_ti_t)surf_cpu_resource_priv(cpu))->state_current;
 706 }
 707
 708 static double cpu_ti_get_speed(void *cpu, double load)
 709 {
 710   return load * ((cpu_ti_t)surf_cpu_resource_priv(cpu))->power_peak;
 711 }
 712
 713 /**
 714 * \brief Auxiliary function to update the CPU power scale.
 715 *
 716 *  This function uses the trace structure to return the power scale at the determined time a.
 717 * \param trace    Trace structure to search the updated power scale
 718 * \param a        Time
 719 * \return CPU power scale
 720 */
 721 static double surf_cpu_ti_get_power_scale(surf_cpu_ti_tgmr_t trace,
 722                                           double a)
 723 {
 724   double reduced_a;
 725   int point;
 726   s_tmgr_event_t val;
 727
 728   reduced_a = a - floor(a / trace->last_time) * trace->last_time;
 729   point =
 730       surf_cpu_ti_binary_search(trace->trace->time_points, reduced_a, 0,
 731                                 trace->trace->nb_points - 1);
 732   xbt_dynar_get_cpy(trace->power_trace->s_list.event_list, point, &val);
 733   return val.value;
 734 }
 735
 736 static double cpu_ti_get_available_speed(void *cpu)
 737 {
 738   cpu_ti_t CPU = surf_cpu_resource_priv(cpu);
 739   CPU->power_scale =
 740       surf_cpu_ti_get_power_scale(CPU->avail_trace, surf_get_clock());
 741 /* number between 0 and 1 */
 742   return CPU->power_scale;
 743 }
 744
 745 static void cpu_ti_finalize(surf_model_t cpu_model)
 746 {
 747   void **cpu;
 748   xbt_lib_cursor_t cursor;
 749   char *key;
 750
 751   /* FIXME: we should update this code for VM support */
 752   xbt_abort();
 753
 754   xbt_lib_foreach(host_lib, cursor, key, cpu){
 755     if(cpu[SURF_CPU_LEVEL])
 756     {
 757         cpu_ti_t CPU = cpu[SURF_CPU_LEVEL];
 758         xbt_swag_free(CPU->action_set);
 759         surf_cpu_ti_free_tmgr(CPU->avail_trace);
 760     }
 761   }
 762
 763   surf_model_exit(cpu_model);
 764   cpu_model = NULL;
 765
 766   xbt_swag_free
 767       (cpu_ti_running_action_set_that_does_not_need_being_checked);
 768   xbt_swag_free(cpu_ti_modified_cpu);
 769   cpu_ti_running_action_set_that_does_not_need_being_checked = NULL;
 770   xbt_heap_free(cpu_ti_action_heap);
 771 }
 772
 773 static surf_model_t surf_cpu_ti_model_init_internal(void)
 774 {
 775   s_surf_action_t action;
 776   s_cpu_ti_t cpu;
 777
 778   surf_model_t cpu_model = surf_model_init();
 779
 780   cpu_ti_running_action_set_that_does_not_need_being_checked =
 781       xbt_swag_new(xbt_swag_offset(action, state_hookup));
 782
 783   cpu_ti_modified_cpu =
 784       xbt_swag_new(xbt_swag_offset(cpu, modified_cpu_hookup));
 785
 786   cpu_model->name = "cpu_ti";
 787   cpu_model->type = SURF_MODEL_TYPE_CPU;
 788
 789   cpu_model->action_unref = cpu_ti_action_unref;
 790   cpu_model->action_cancel = cpu_ti_action_cancel;
 791   cpu_model->action_state_set = cpu_ti_action_state_set;
 792
 793   cpu_model->model_private->resource_used = cpu_ti_resource_used;
 794   cpu_model->model_private->share_resources = cpu_ti_share_resources;
 795   cpu_model->model_private->update_actions_state =
 796       cpu_ti_update_actions_state;
 797   cpu_model->model_private->update_resource_state =
 798       cpu_ti_update_resource_state;
 799   cpu_model->model_private->finalize = cpu_ti_finalize;
 800
 801   cpu_model->suspend = cpu_ti_action_suspend;
 802   cpu_model->resume = cpu_ti_action_resume;
 803   cpu_model->is_suspended = cpu_ti_action_is_suspended;
 804   cpu_model->set_max_duration = cpu_ti_action_set_max_duration;
 805   cpu_model->set_priority = cpu_ti_action_set_priority;
 806   cpu_model->get_remains = cpu_ti_action_get_remains;
 807
 808   cpu_model->extension.cpu.execute = cpu_ti_execute;
 809   cpu_model->extension.cpu.sleep = cpu_ti_action_sleep;
 810
 811   cpu_model->extension.cpu.get_state = cpu_ti_get_state;
 812   cpu_model->extension.cpu.get_speed = cpu_ti_get_speed;
 813   cpu_model->extension.cpu.get_available_speed =
 814       cpu_ti_get_available_speed;
 815   cpu_model->extension.cpu.add_traces = add_traces_cpu_ti;
 816
 817   cpu_ti_action_heap = xbt_heap_new(8, NULL);
 818   xbt_heap_set_update_callback(cpu_ti_action_heap,
 819                                cpu_ti_action_update_index_heap);
 820
 821   return cpu_model;
 822 }
 823
 824 surf_model_t surf_cpu_model_init_ti(void)
 825 {
 826   surf_model_t cpu_model = surf_cpu_ti_model_init_internal();
 827   cpu_ti_define_callbacks();
 828   xbt_dynar_push(model_list, &cpu_model);
 829
 830   return cpu_model;
 831 }
 832
 833
 834 /**
 835 * \brief Integrate trace
 836 *
 837 * Wrapper around surf_cpu_integrate_trace_simple() to get
 838 * the cyclic effect.
 839 *
 840 * \param trace Trace structure.
 841 * \param a      Begin of interval
 842 * \param b      End of interval
 843 * \return the integrate value. -1 if an error occurs.
 844 */
 845 static double surf_cpu_ti_integrate_trace(surf_cpu_ti_tgmr_t trace,
 846                                           double a, double b)
 847 {
 848   double first_chunk;
 849   double middle_chunk;
 850   double last_chunk;
 851   int a_index, b_index;
 852
 853   if ((a < 0.0) || (a > b)) {
 854     XBT_CRITICAL
 855         ("Error, invalid integration interval [%.2f,%.2f]. You probably have a task executing with negative computation amount. Check your code.",
 856          a, b);
 857     xbt_abort();
 858   }
 859   if (a == b)
 860     return 0.0;
 861
 862   if (trace->type == TRACE_FIXED) {
 863     return ((b - a) * trace->value);
 864   }
 865
 866   if (ceil(a / trace->last_time) == a / trace->last_time)
 867     a_index = 1 + (int) (ceil(a / trace->last_time));
 868   else
 869     a_index = (int) (ceil(a / trace->last_time));
 870
 871   b_index = (int) (floor(b / trace->last_time));
 872
 873   if (a_index > b_index) {      /* Same chunk */
 874     return surf_cpu_ti_integrate_trace_simple(trace->trace,
 875                                               a - (a_index -
 876                                                    1) * trace->last_time,
 877                                               b -
 878                                               (b_index) *
 879                                               trace->last_time);
 880   }
 881
 882   first_chunk = surf_cpu_ti_integrate_trace_simple(trace->trace,
 883                                                    a - (a_index -
 884                                                         1) *
 885                                                    trace->last_time,
 886                                                    trace->last_time);
 887   middle_chunk = (b_index - a_index) * trace->total;
 888   last_chunk = surf_cpu_ti_integrate_trace_simple(trace->trace,
 889                                                   0.0,
 890                                                   b -
 891                                                   (b_index) *
 892                                                   trace->last_time);
 893
 894   XBT_DEBUG("first_chunk=%.2f  middle_chunk=%.2f  last_chunk=%.2f\n",
 895          first_chunk, middle_chunk, last_chunk);
 896
 897   return (first_chunk + middle_chunk + last_chunk);
 898 }
 899
 900 /**
 901  * \brief Auxiliary function to calculate the integral between a and b.
 902  *     It simply calculates the integral at point a and b and returns the difference
 903  *   between them.
 904  * \param trace    Trace structure
 905  * \param a        Initial point
 906  * \param b  Final point
 907  * \return  Integral
 908 */
 909 static double surf_cpu_ti_integrate_trace_simple(surf_cpu_ti_trace_t trace,
 910                                                  double a, double b)
 911 {
 912   return surf_cpu_ti_integrate_trace_simple_point(trace,
 913                                                   b) -
 914       surf_cpu_ti_integrate_trace_simple_point(trace, a);
 915 }
 916
 917 /**
 918  * \brief Auxiliary function to calculate the integral at point a.
 919  * \param trace    Trace structure
 920  * \param a        point
 921  * \return  Integral
 922 */
 923 static double surf_cpu_ti_integrate_trace_simple_point(surf_cpu_ti_trace_t
 924                                                        trace, double a)
 925 {
 926   double integral = 0;
 927   int ind;
 928   double a_aux = a;
 929   ind =
 930       surf_cpu_ti_binary_search(trace->time_points, a, 0,
 931                                 trace->nb_points - 1);
 932   integral += trace->integral[ind];
 933   XBT_DEBUG
 934       ("a %lf ind %d integral %lf ind + 1 %lf ind %lf time +1 %lf time %lf",
 935        a, ind, integral, trace->integral[ind + 1], trace->integral[ind],
 936        trace->time_points[ind + 1], trace->time_points[ind]);
 937   double_update(&a_aux, trace->time_points[ind]);
 938   if (a_aux > 0)
 939     integral +=
 940         ((trace->integral[ind + 1] -
 941           trace->integral[ind]) / (trace->time_points[ind + 1] -
 942                                    trace->time_points[ind])) * (a -
 943                                                                 trace->
 944                                                                 time_points
 945                                                                 [ind]);
 946   XBT_DEBUG("Integral a %lf = %lf", a, integral);
 947
 948   return integral;
 949 }
 950
 951 /**
 952 * \brief Calculate the time needed to execute "amount" on cpu.
 953 *
 954 * Here, amount can span multiple trace periods
 955 *
 956 * \param trace   CPU trace structure
 957 * \param a        Initial time
 958 * \param amount  Amount to be executed
 959 * \return  End time
 960 */
 961 static double surf_cpu_ti_solve_trace(surf_cpu_ti_tgmr_t trace, double a,
 962                                       double amount)
 963 {
 964   int quotient;
 965   double reduced_b;
 966   double reduced_amount;
 967   double reduced_a;
 968   double b;
 969
 970 /* Fix very small negative numbers */
 971   if ((a < 0.0) && (a > -EPSILON)) {
 972     a = 0.0;
 973   }
 974   if ((amount < 0.0) && (amount > -EPSILON)) {
 975     amount = 0.0;
 976   }
 977
 978 /* Sanity checks */
 979   if ((a < 0.0) || (amount < 0.0)) {
 980     XBT_CRITICAL
 981         ("Error, invalid parameters [a = %.2f, amount = %.2f]. You probably have a task executing with negative computation amount. Check your code.",
 982          a, amount);
 983     xbt_abort();
 984   }
 985
 986 /* At this point, a and amount are positive */
 987
 988   if (amount < EPSILON)
 989     return a;
 990
 991 /* Is the trace fixed ? */
 992   if (trace->type == TRACE_FIXED) {
 993     return (a + (amount / trace->value));
 994   }
 995
 996   XBT_DEBUG("amount %lf total %lf", amount, trace->total);
 997 /* Reduce the problem to one where amount <= trace_total */
 998   quotient = (int) (floor(amount / trace->total));
 999   reduced_amount = (trace->total) * ((amount / trace->total) -
1000                                      floor(amount / trace->total));
1001   reduced_a = a - (trace->last_time) * (int) (floor(a / trace->last_time));
1002
1003   XBT_DEBUG("Quotient: %d reduced_amount: %lf reduced_a: %lf", quotient,
1004          reduced_amount, reduced_a);
1005
1006 /* Now solve for new_amount which is <= trace_total */
1007 /*
1008    fprintf(stderr,"reduced_a = %.2f\n",reduced_a);
1009    fprintf(stderr,"reduced_amount = %.2f\n",reduced_amount);
1010  */
1011   reduced_b =
1012       surf_cpu_ti_solve_trace_somewhat_simple(trace, reduced_a,
1013                                               reduced_amount);
1014
1015 /* Re-map to the original b and amount */
1016   b = (trace->last_time) * (int) (floor(a / trace->last_time)) +
1017       (quotient * trace->last_time) + reduced_b;
1018   return b;
1019 }
1020
1021 /**
1022 * \brief Auxiliary function to solve integral
1023 *
1024 * Here, amount is <= trace->total
1025 * and a <=trace->last_time
1026 *
1027 */
1028 static double surf_cpu_ti_solve_trace_somewhat_simple(surf_cpu_ti_tgmr_t
1029                                                       trace, double a,
1030                                                       double amount)
1031 {
1032   double amount_till_end;
1033   double b;
1034
1035   XBT_DEBUG("Solve integral: [%.2f, amount=%.2f]", a, amount);
1036   amount_till_end =
1037       surf_cpu_ti_integrate_trace(trace, a, trace->last_time);
1038 /*
1039    fprintf(stderr,"amount_till_end=%.2f\n",amount_till_end);
1040  */
1041
1042   if (amount_till_end > amount) {
1043     b = surf_cpu_ti_solve_trace_simple(trace->trace, a, amount);
1044   } else {
1045     b = trace->last_time +
1046         surf_cpu_ti_solve_trace_simple(trace->trace, 0.0,
1047                                        amount - amount_till_end);
1048   }
1049   return b;
1050 }
1051
1052 /**
1053  * \brief Auxiliary function to solve integral.
1054  *  It returns the date when the requested amount of flops is available
1055  * \param trace    Trace structure
1056  * \param a        Initial point
1057  * \param amount  Amount of flops
1058  * \return The date when amount is available.
1059 */
1060 static double surf_cpu_ti_solve_trace_simple(surf_cpu_ti_trace_t trace,
1061                                              double a, double amount)
1062 {
1063   double integral_a;
1064   int ind;
1065   double time;
1066   integral_a = surf_cpu_ti_integrate_trace_simple_point(trace, a);
1067   ind =
1068       surf_cpu_ti_binary_search(trace->integral, integral_a + amount, 0,
1069                                 trace->nb_points - 1);
1070   time = trace->time_points[ind];
1071   time +=
1072       (integral_a + amount -
1073        trace->integral[ind]) / ((trace->integral[ind + 1] -
1074                                  trace->integral[ind]) /
1075                                 (trace->time_points[ind + 1] -
1076                                  trace->time_points[ind]));
1077
1078   return time;
1079 }
1080
1081 /**
1082  * \brief Binary search in array.
1083  *  It returns the first point of the interval in which "a" is.
1084  * \param array    Array
1085  * \param a        Value to search
1086  * \param low     Low bound to search in array
1087  * \param high    Upper bound to search in array
1088  * \return Index of point
1089 */
1090 static int surf_cpu_ti_binary_search(double *array, double a, int low,
1091                                      int high)
1092 {
1093   xbt_assert(low < high, "Wrong parameters: low (%d) should be smaller than"
1094       " high (%d)", low, high);
1095
1096   int mid;
1097   do {
1098     mid = low + (high - low) / 2;
1099     XBT_DEBUG("a %lf low %d high %d mid %d value %lf", a, low, high, mid,
1100         array[mid]);
1101
1102     if (array[mid] > a)
1103       high = mid;
1104     else
1105       low = mid;
1106   }
1107   while (low < high - 1);
1108
1109   return low;
1110 }