src/surf/network_cm02.cpp

   1 /* Copyright (c) 2013-2014. 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 "network_cm02.hpp"
   8 #include "maxmin_private.hpp"
   9 #include "simgrid/sg_config.h"
  10
  11 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
  12
  13 double sg_sender_gap = 0.0;
  14 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
  15 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
  16 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
  17
  18 double sg_tcp_gamma = 0.0;
  19 int sg_network_crosstraffic = 0;
  20
  21 /*************
  22  * CallBacks *
  23  *************/
  24
  25 void net_define_callbacks(void)
  26 {
  27   /* Figuring out the network links */
  28   sg_platf_link_add_cb(netlink_parse_init);
  29   sg_platf_postparse_add_cb(net_add_traces);
  30 }
  31
  32 /*********
  33  * Model *
  34  *********/
  35
  36 /************************************************************************/
  37 /* New model based on optimizations discussed during Pedro Velho's thesis*/
  38 /************************************************************************/
  39 /* @techreport{VELHO:2011:HAL-00646896:1, */
  40 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
  41 /*      title = {{Flow-level network models: have we reached the limits?}}, */
  42 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
  43 /*      type = {Rapport de recherche}, */
  44 /*      institution = {INRIA}, */
  45 /*      number = {RR-7821}, */
  46 /*      year = {2011}, */
  47 /*      month = Nov, */
  48 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
  49 /*  } */
  50 void surf_network_model_init_LegrandVelho(void)
  51 {
  52   if (surf_network_model)
  53     return;
  54
  55   surf_network_model = new NetworkCm02Model();
  56   net_define_callbacks();
  57   Model *model = surf_network_model;
  58   xbt_dynar_push(model_list, &model);
  59
  60   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",
  61                             13.01);
  62   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
  63                             0.97);
  64   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 20537);
  65 }
  66
  67 /***************************************************************************/
  68 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
  69 /***************************************************************************/
  70 /* @TechReport{      rr-lip2002-40, */
  71 /*   author        = {Henri Casanova and Loris Marchal}, */
  72 /*   institution   = {LIP}, */
  73 /*   title         = {A Network Model for Simulation of Grid Application}, */
  74 /*   number        = {2002-40}, */
  75 /*   month         = {oct}, */
  76 /*   year          = {2002} */
  77 /* } */
  78 void surf_network_model_init_CM02(void)
  79 {
  80
  81   if (surf_network_model)
  82     return;
  83
  84   surf_network_model = new NetworkCm02Model();
  85   net_define_callbacks();
  86   Model *model = surf_network_model;
  87   xbt_dynar_push(model_list, &model);
  88
  89   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 1.0);
  90   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
  91                             1.0);
  92   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 0.0);
  93 }
  94
  95 /***************************************************************************/
  96 /* The models from Steven H. Low                                           */
  97 /***************************************************************************/
  98 /* @article{Low03,                                                         */
  99 /*   author={Steven H. Low},                                               */
 100 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
 101 /*   year={2003},                                                          */
 102 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
 103 /*    volume={11}, number={4},                                             */
 104 /*  }                                                                      */
 105 void surf_network_model_init_Reno(void)
 106 {
 107   if (surf_network_model)
 108     return;
 109
 110   surf_network_model = new NetworkCm02Model();
 111   net_define_callbacks();
 112   Model *model = surf_network_model;
 113   xbt_dynar_push(model_list, &model);
 114   lmm_set_default_protocol_function(func_reno_f, func_reno_fp,
 115                                     func_reno_fpi);
 116   surf_network_model->f_networkSolve = lagrange_solve;
 117
 118   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 119   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 120                             0.92);
 121   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 122 }
 123
 124
 125 void surf_network_model_init_Reno2(void)
 126 {
 127   if (surf_network_model)
 128     return;
 129
 130   surf_network_model = new NetworkCm02Model();
 131   net_define_callbacks();
 132   Model *model = surf_network_model;
 133   xbt_dynar_push(model_list, &model);
 134   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 135                                     func_reno2_fpi);
 136   surf_network_model->f_networkSolve = lagrange_solve;
 137
 138   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 139   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 140                             0.92);
 141   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S",
 142                             8775);
 143 }
 144
 145 void surf_network_model_init_Vegas(void)
 146 {
 147   if (surf_network_model)
 148     return;
 149
 150   surf_network_model = new NetworkCm02Model();
 151   net_define_callbacks();
 152   Model *model = surf_network_model;
 153   xbt_dynar_push(model_list, &model);
 154   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 155                                     func_vegas_fpi);
 156   surf_network_model->f_networkSolve = lagrange_solve;
 157
 158   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 159   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 160                             0.92);
 161   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 162 }
 163
 164 NetworkCm02Model::NetworkCm02Model()
 165         :NetworkModel()
 166 {
 167   char *optim = xbt_cfg_get_string(_sg_cfg_set, "network/optim");
 168   int select =
 169       xbt_cfg_get_boolean(_sg_cfg_set, "network/maxmin_selective_update");
 170
 171   if (!strcmp(optim, "Full")) {
 172     p_updateMechanism = UM_FULL;
 173     m_selectiveUpdate = select;
 174   } else if (!strcmp(optim, "Lazy")) {
 175     p_updateMechanism = UM_LAZY;
 176     m_selectiveUpdate = 1;
 177     xbt_assert((select == 1)
 178                ||
 179                (xbt_cfg_is_default_value
 180                 (_sg_cfg_set, "network/maxmin_selective_update")),
 181                "Disabling selective update while using the lazy update mechanism is dumb!");
 182   } else {
 183     xbt_die("Unsupported optimization (%s) for this model", optim);
 184   }
 185
 186   if (!p_maxminSystem)
 187         p_maxminSystem = lmm_system_new(m_selectiveUpdate);
 188
 189   routing_model_create(createLink("__loopback__",
 190                                       498000000, NULL, 0.000015, NULL,
 191                                       SURF_RESOURCE_ON, NULL,
 192                                       SURF_LINK_FATPIPE, NULL));
 193
 194   if (p_updateMechanism == UM_LAZY) {
 195         p_actionHeap = xbt_heap_new(8, NULL);
 196         xbt_heap_set_update_callback(p_actionHeap, surf_action_lmm_update_index_heap);
 197         p_modifiedSet = new ActionLmmList();
 198         p_maxminSystem->keep_track = p_modifiedSet;
 199   }
 200
 201   m_haveGap = false;
 202 }
 203
 204 Link* NetworkCm02Model::createLink(const char *name,
 205                                  double bw_initial,
 206                                  tmgr_trace_t bw_trace,
 207                                  double lat_initial,
 208                                  tmgr_trace_t lat_trace,
 209                                  e_surf_resource_state_t state_initial,
 210                                  tmgr_trace_t state_trace,
 211                                  e_surf_link_sharing_policy_t policy,
 212                                  xbt_dict_t properties)
 213 {
 214   xbt_assert(NULL == Link::byName(name),
 215              "Link '%s' declared several times in the platform",
 216              name);
 217
 218   return new NetworkCm02Link(this, name, properties, p_maxminSystem, sg_bandwidth_factor * bw_initial, history,
 219                                              state_initial, state_trace, bw_initial, bw_trace, lat_initial, lat_trace, policy);
 220 }
 221
 222 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
 223 {
 224   NetworkCm02Action *action;
 225   while ((xbt_heap_size(p_actionHeap) > 0)
 226          && (double_equals(xbt_heap_maxkey(p_actionHeap), now, sg_surf_precision))) {
 227     action = static_cast<NetworkCm02Action*> (xbt_heap_pop(p_actionHeap));
 228     XBT_DEBUG("Something happened to action %p", action);
 229     if (TRACE_is_enabled()) {
 230       int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 231       int i;
 232       for (i = 0; i < n; i++){
 233         lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 234                                                             action->getVariable(),
 235                                                             i);
 236         NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 237         TRACE_surf_link_set_utilization(link->getName(),
 238                                         action->getCategory(),
 239                                         (lmm_variable_getvalue(action->getVariable())*
 240                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 241                                                 action->getVariable(),
 242                                                 i)),
 243                                         action->getLastUpdate(),
 244                                         now - action->getLastUpdate());
 245       }
 246     }
 247
 248     // if I am wearing a latency hat
 249     if (action->getHat() == LATENCY) {
 250       XBT_DEBUG("Latency paid for action %p. Activating", action);
 251       lmm_update_variable_weight(p_maxminSystem, action->getVariable(), action->m_weight);
 252       action->heapRemove(p_actionHeap);
 253       action->refreshLastUpdate();
 254
 255         // if I am wearing a max_duration or normal hat
 256     } else if (action->getHat() == MAX_DURATION ||
 257         action->getHat() == NORMAL) {
 258         // no need to communicate anymore
 259         // assume that flows that reached max_duration have remaining of 0
 260       XBT_DEBUG("Action %p finished", action);
 261       action->setRemains(0);
 262       action->finish();
 263       action->setState(SURF_ACTION_DONE);
 264       action->heapRemove(p_actionHeap);
 265
 266       action->gapRemove();
 267     }
 268   }
 269   return;
 270 }
 271
 272
 273 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
 274 {
 275   NetworkCm02Action *action;
 276   ActionList *running_actions = getRunningActionSet();
 277
 278   for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
 279      ; it != itend ; it=itNext) {
 280         ++itNext;
 281
 282     action = static_cast<NetworkCm02Action*> (&*it);
 283     XBT_DEBUG("Something happened to action %p", action);
 284       double deltap = delta;
 285       if (action->m_latency > 0) {
 286         if (action->m_latency > deltap) {
 287           double_update(&(action->m_latency), deltap, sg_surf_precision);
 288           deltap = 0.0;
 289         } else {
 290           double_update(&(deltap), action->m_latency, sg_surf_precision);
 291           action->m_latency = 0.0;
 292         }
 293         if (action->m_latency == 0.0 && !(action->isSuspended()))
 294           lmm_update_variable_weight(p_maxminSystem, action->getVariable(),
 295               action->m_weight);
 296       }
 297       if (TRACE_is_enabled()) {
 298         int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 299         int i;
 300         for (i = 0; i < n; i++){
 301           lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 302                                                             action->getVariable(),
 303                                                             i);
 304           NetworkCm02Link* link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 305           TRACE_surf_link_set_utilization(link->getName(),
 306                                         action->getCategory(),
 307                                         (lmm_variable_getvalue(action->getVariable())*
 308                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 309                                                 action->getVariable(),
 310                                                 i)),
 311                                         action->getLastUpdate(),
 312                                         now - action->getLastUpdate());
 313         }
 314       }
 315       if (!lmm_get_number_of_cnst_from_var
 316           (p_maxminSystem, action->getVariable())) {
 317         /* There is actually no link used, hence an infinite bandwidth.
 318          * This happens often when using models like vivaldi.
 319          * In such case, just make sure that the action completes immediately.
 320          */
 321         action->updateRemains(action->getRemains());
 322       }
 323     action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
 324
 325     if (action->getMaxDuration() != NO_MAX_DURATION)
 326       action->updateMaxDuration(delta);
 327
 328     if ((action->getRemains() <= 0) &&
 329         (lmm_get_variable_weight(action->getVariable()) > 0)) {
 330       action->finish();
 331       action->setState(SURF_ACTION_DONE);
 332       action->gapRemove();
 333     } else if (((action->getMaxDuration() != NO_MAX_DURATION)
 334         && (action->getMaxDuration() <= 0))) {
 335       action->finish();
 336       action->setState(SURF_ACTION_DONE);
 337       action->gapRemove();
 338     }
 339   }
 340   return;
 341 }
 342
 343 Action *NetworkCm02Model::communicate(RoutingEdge *src, RoutingEdge *dst,
 344                                                 double size, double rate)
 345 {
 346   unsigned int i;
 347   void *_link;
 348   NetworkCm02Link *link;
 349   int failed = 0;
 350   NetworkCm02Action *action = NULL;
 351   double bandwidth_bound;
 352   double latency = 0.0;
 353   xbt_dynar_t back_route = NULL;
 354   int constraints_per_variable = 0;
 355
 356   xbt_dynar_t route = xbt_dynar_new(sizeof(RoutingEdge*), NULL);
 357
 358   XBT_IN("(%s,%s,%g,%g)", src->getName(), dst->getName(), size, rate);
 359
 360   routing_platf->getRouteAndLatency(src, dst, &route, &latency);
 361   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 362              "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 363              src->getName(), dst->getName());
 364
 365   xbt_dynar_foreach(route, i, _link) {
 366         link = static_cast<NetworkCm02Link*>(_link);
 367     if (link->getState() == SURF_RESOURCE_OFF) {
 368       failed = 1;
 369       break;
 370     }
 371   }
 372   if (sg_network_crosstraffic == 1) {
 373           routing_platf->getRouteAndLatency(dst, src, &back_route, NULL);
 374     xbt_dynar_foreach(back_route, i, _link) {
 375       link = static_cast<NetworkCm02Link*>(_link);
 376       if (link->getState() == SURF_RESOURCE_OFF) {
 377         failed = 1;
 378         break;
 379       }
 380     }
 381   }
 382
 383   action = new NetworkCm02Action(this, size, failed);
 384
 385 #ifdef HAVE_LATENCY_BOUND_TRACKING
 386   action->m_latencyLimited = 0;
 387 #endif
 388   action->m_weight = action->m_latency = latency;
 389
 390   action->m_rate = rate;
 391   if (p_updateMechanism == UM_LAZY) {
 392     action->m_indexHeap = -1;
 393     action->m_lastUpdate = surf_get_clock();
 394   }
 395
 396   bandwidth_bound = -1.0;
 397   if (sg_weight_S_parameter > 0) {
 398     xbt_dynar_foreach(route, i, _link) {
 399       link = static_cast<NetworkCm02Link*>(_link);
 400       action->m_weight += sg_weight_S_parameter / link->getBandwidth();
 401     }
 402   }
 403   xbt_dynar_foreach(route, i, _link) {
 404         link = static_cast<NetworkCm02Link*>(_link);
 405     double bb = bandwidthFactor(size) * link->getBandwidth(); //(link->p_power.peak * link->p_power.scale);
 406     bandwidth_bound =
 407         (bandwidth_bound < 0.0) ? bb : min(bandwidth_bound, bb);
 408   }
 409
 410   action->m_latCurrent = action->m_latency;
 411   action->m_latency *= latencyFactor(size);
 412   action->m_rate = bandwidthConstraint(action->m_rate, bandwidth_bound, size);
 413   if (m_haveGap) {
 414     xbt_assert(!xbt_dynar_is_empty(route),
 415                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 416
 417     link = *static_cast<NetworkCm02Link **>(xbt_dynar_get_ptr(route, 0));
 418     gapAppend(size, link, action);
 419     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 420               action, src->getName(), dst->getName(), action->m_senderGap,
 421               action->m_latency);
 422   }
 423
 424   constraints_per_variable = xbt_dynar_length(route);
 425   if (back_route != NULL)
 426     constraints_per_variable += xbt_dynar_length(back_route);
 427
 428   if (action->m_latency > 0) {
 429     action->p_variable = lmm_variable_new(p_maxminSystem, action, 0.0, -1.0,
 430                          constraints_per_variable);
 431     if (p_updateMechanism == UM_LAZY) {
 432       // add to the heap the event when the latency is payed
 433       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 434                 action->m_latency + action->m_lastUpdate);
 435       action->heapInsert(p_actionHeap, action->m_latency + action->m_lastUpdate, xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 436     }
 437   } else
 438     action->p_variable = lmm_variable_new(p_maxminSystem, action, 1.0, -1.0, constraints_per_variable);
 439
 440   if (action->m_rate < 0) {
 441     lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? sg_tcp_gamma / (2.0 * action->m_latCurrent) : -1.0);
 442   } else {
 443     lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)) : action->m_rate);
 444   }
 445
 446   xbt_dynar_foreach(route, i, _link) {
 447         link = static_cast<NetworkCm02Link*>(_link);
 448     lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), 1.0);
 449   }
 450
 451   if (sg_network_crosstraffic == 1) {
 452     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 453     xbt_dynar_foreach(back_route, i, _link) {
 454       link = static_cast<NetworkCm02Link*>(_link);
 455       lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), .05);
 456     }
 457   }
 458
 459   xbt_dynar_free(&route);
 460   XBT_OUT();
 461
 462   surf_callback_emit(networkCommunicateCallbacks, action, src, dst, size, rate);
 463   return action;
 464 }
 465
 466 void NetworkCm02Model::addTraces(){
 467   xbt_dict_cursor_t cursor = NULL;
 468   char *trace_name, *elm;
 469
 470   static int called = 0;
 471   if (called)
 472     return;
 473   called = 1;
 474
 475   /* connect all traces relative to network */
 476   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 477     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
 478     NetworkCm02Link *link = static_cast<NetworkCm02Link*>( Link::byName(elm) );
 479
 480     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 481                trace_name, elm);
 482     xbt_assert(trace,
 483                "Cannot connect trace %s to link %s: trace undefined",
 484                trace_name, elm);
 485
 486     link->p_stateEvent = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 487   }
 488
 489   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 490     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
 491     NetworkCm02Link *link = static_cast<NetworkCm02Link*>( Link::byName(elm) );
 492
 493     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 494                trace_name, elm);
 495     xbt_assert(trace,
 496                "Cannot connect trace %s to link %s: trace undefined",
 497                trace_name, elm);
 498
 499     link->p_power.event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 500   }
 501
 502   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 503     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
 504     NetworkCm02Link *link = static_cast<NetworkCm02Link*>(Link::byName(elm));;
 505
 506     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 507                trace_name, elm);
 508     xbt_assert(trace,
 509                "Cannot connect trace %s to link %s: trace undefined",
 510                trace_name, elm);
 511
 512     link->p_latEvent = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 513   }
 514 }
 515
 516 /************
 517  * Resource *
 518  ************/
 519 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model *model, const char *name, xbt_dict_t props,
 520                                    lmm_system_t system,
 521                                    double constraint_value,
 522                                    tmgr_history_t history,
 523                                    e_surf_resource_state_t state_init,
 524                                    tmgr_trace_t state_trace,
 525                                    double metric_peak,
 526                                    tmgr_trace_t metric_trace,
 527                                    double lat_initial,
 528                                    tmgr_trace_t lat_trace,
 529                                    e_surf_link_sharing_policy_t policy)
 530 : Link(model, name, props, lmm_constraint_new(system, this, constraint_value), history, state_trace)
 531 {
 532   setState(state_init);
 533
 534   p_power.scale = 1.0;
 535   p_power.peak = metric_peak;
 536   if (metric_trace)
 537     p_power.event = tmgr_history_add_trace(history, metric_trace, 0.0, 0, this);
 538   else
 539     p_power.event = NULL;
 540
 541   m_latCurrent = lat_initial;
 542   if (lat_trace)
 543         p_latEvent = tmgr_history_add_trace(history, lat_trace, 0.0, 0, this);
 544
 545   if (policy == SURF_LINK_FATPIPE)
 546         lmm_constraint_shared(getConstraint());
 547 }
 548
 549
 550
 551 void NetworkCm02Link::updateState(tmgr_trace_event_t event_type,
 552                                       double value, double date)
 553 {
 554   /*   printf("[" "%g" "] Asking to update network card \"%s\" with value " */
 555   /*     "%g" " for event %p\n", surf_get_clock(), nw_link->name, */
 556   /*     value, event_type); */
 557
 558   if (event_type == p_power.event) {
 559     updateBandwidth(value, date);
 560     if (tmgr_trace_event_free(event_type))
 561       p_power.event = NULL;
 562   } else if (event_type == p_latEvent) {
 563     updateLatency(value, date);
 564     if (tmgr_trace_event_free(event_type))
 565       p_latEvent = NULL;
 566   } else if (event_type == p_stateEvent) {
 567     if (value > 0)
 568       setState(SURF_RESOURCE_ON);
 569     else {
 570       lmm_constraint_t cnst = getConstraint();
 571       lmm_variable_t var = NULL;
 572       lmm_element_t elem = NULL;
 573
 574       setState(SURF_RESOURCE_OFF);
 575       while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), cnst, &elem))) {
 576         Action *action = static_cast<Action*>( lmm_variable_id(var) );
 577
 578         if (action->getState() == SURF_ACTION_RUNNING ||
 579             action->getState() == SURF_ACTION_READY) {
 580           action->setFinishTime(date);
 581           action->setState(SURF_ACTION_FAILED);
 582         }
 583       }
 584     }
 585     if (tmgr_trace_event_free(event_type))
 586       p_stateEvent = NULL;
 587   } else {
 588     XBT_CRITICAL("Unknown event ! \n");
 589     xbt_abort();
 590   }
 591
 592   XBT_DEBUG
 593       ("There were a resource state event, need to update actions related to the constraint (%p)",
 594        getConstraint());
 595   return;
 596 }
 597
 598 void NetworkCm02Link::updateBandwidth(double value, double date){
 599   double delta = sg_weight_S_parameter / value - sg_weight_S_parameter /
 600                  (p_power.peak * p_power.scale);
 601   lmm_variable_t var = NULL;
 602   lmm_element_t elem = NULL;
 603   lmm_element_t nextelem = NULL;
 604   int numelem = 0;
 605
 606   NetworkCm02Action *action = NULL;
 607
 608   p_power.peak = value;
 609   lmm_update_constraint_bound(getModel()->getMaxminSystem(),
 610                               getConstraint(),
 611                               sg_bandwidth_factor *
 612                               (p_power.peak * p_power.scale));
 613   TRACE_surf_link_set_bandwidth(date, getName(), sg_bandwidth_factor * p_power.peak * p_power.scale);
 614   if (sg_weight_S_parameter > 0) {
 615     while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 616       action = (NetworkCm02Action*) lmm_variable_id(var);
 617       action->m_weight += delta;
 618       if (!action->isSuspended())
 619         lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 620     }
 621   }
 622 }
 623
 624 void NetworkCm02Link::updateLatency(double value, double date){
 625   double delta = value - m_latCurrent;
 626   lmm_variable_t var = NULL;
 627   lmm_element_t elem = NULL;
 628   lmm_element_t nextelem = NULL;
 629   int numelem = 0;
 630   NetworkCm02Action *action = NULL;
 631
 632   m_latCurrent = value;
 633   while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 634     action = (NetworkCm02Action*) lmm_variable_id(var);
 635     action->m_latCurrent += delta;
 636     action->m_weight += delta;
 637     if (action->m_rate < 0)
 638       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(), sg_tcp_gamma / (2.0 * action->m_latCurrent));
 639     else {
 640       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(),
 641                                 min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)));
 642
 643       if (action->m_rate < sg_tcp_gamma / (2.0 * action->m_latCurrent)) {
 644         XBT_INFO("Flow is limited BYBANDWIDTH");
 645       } else {
 646         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 647                  action->m_latCurrent);
 648       }
 649     }
 650     if (!action->isSuspended())
 651       lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 652   }
 653 }
 654
 655 /**********
 656  * Action *
 657  **********/
 658 void NetworkCm02Action::updateRemainingLazy(double now)
 659 {
 660   double delta = 0.0;
 661
 662   if (m_suspended != 0)
 663     return;
 664
 665   delta = now - m_lastUpdate;
 666
 667   if (m_remains > 0) {
 668     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
 669     double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
 670
 671     XBT_DEBUG("Updating action(%p): remains is now %f", this, m_remains);
 672   }
 673
 674   if (m_maxDuration != NO_MAX_DURATION)
 675     double_update(&m_maxDuration, delta, sg_surf_precision);
 676
 677   if (m_remains <= 0 &&
 678       (lmm_get_variable_weight(getVariable()) > 0)) {
 679     finish();
 680     setState(SURF_ACTION_DONE);
 681
 682     heapRemove(getModel()->getActionHeap());
 683   } else if (((m_maxDuration != NO_MAX_DURATION)
 684       && (m_maxDuration <= 0))) {
 685     finish();
 686     setState(SURF_ACTION_DONE);
 687     heapRemove(getModel()->getActionHeap());
 688   }
 689
 690   m_lastUpdate = now;
 691   m_lastValue = lmm_variable_getvalue(getVariable());
 692 }
 693