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 static void net_parse_link_init(sg_platf_link_cbarg_t link){
  26   if (link->policy == SURF_LINK_FULLDUPLEX) {
  27     char *link_id;
  28     link_id = bprintf("%s_UP", link->id);
  29     surf_network_model->createResource(link_id,
  30                       link->bandwidth,
  31                       link->bandwidth_trace,
  32                       link->latency,
  33                       link->latency_trace,
  34                       link->state,
  35                       link->state_trace, link->policy, link->properties);
  36     xbt_free(link_id);
  37     link_id = bprintf("%s_DOWN", link->id);
  38     surf_network_model->createResource(link_id,
  39                       link->bandwidth,
  40                       link->bandwidth_trace,
  41                       link->latency,
  42                       link->latency_trace,
  43                       link->state,
  44                       link->state_trace, link->policy, link->properties);
  45     xbt_free(link_id);
  46   } else {
  47         surf_network_model->createResource(link->id,
  48                       link->bandwidth,
  49                       link->bandwidth_trace,
  50                       link->latency,
  51                       link->latency_trace,
  52                       link->state,
  53                       link->state_trace, link->policy, link->properties);
  54   }
  55 }
  56
  57 static void net_add_traces(void){
  58   xbt_dict_cursor_t cursor = NULL;
  59   char *trace_name, *elm;
  60
  61   static int called = 0;
  62   if (called)
  63     return;
  64   called = 1;
  65
  66   /* connect all traces relative to network */
  67   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
  68     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
  69     NetworkCm02LinkPtr link = static_cast<NetworkCm02LinkPtr>(
  70                                     xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL));
  71
  72     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
  73                trace_name, elm);
  74     xbt_assert(trace,
  75                "Cannot connect trace %s to link %s: trace undefined",
  76                trace_name, elm);
  77
  78     link->p_stateEvent = tmgr_history_add_trace(history, trace, 0.0, 0, static_cast<ResourcePtr>(link));
  79   }
  80
  81   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
  82     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
  83     NetworkCm02LinkPtr link = static_cast<NetworkCm02LinkPtr>(
  84                                 xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL));
  85
  86     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
  87                trace_name, elm);
  88     xbt_assert(trace,
  89                "Cannot connect trace %s to link %s: trace undefined",
  90                trace_name, elm);
  91
  92     link->p_power.event = tmgr_history_add_trace(history, trace, 0.0, 0, static_cast<ResourcePtr>(link));
  93   }
  94
  95   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
  96     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
  97     NetworkCm02LinkPtr link = static_cast<NetworkCm02LinkPtr>(
  98                                     xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL));
  99
 100     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 101                trace_name, elm);
 102     xbt_assert(trace,
 103                "Cannot connect trace %s to link %s: trace undefined",
 104                trace_name, elm);
 105
 106     link->p_latEvent = tmgr_history_add_trace(history, trace, 0.0, 0, static_cast<ResourcePtr>(link));
 107   }
 108 }
 109
 110 void net_define_callbacks(void)
 111 {
 112   /* Figuring out the network links */
 113   sg_platf_link_add_cb(net_parse_link_init);
 114   sg_platf_postparse_add_cb(net_add_traces);
 115 }
 116
 117 /*********
 118  * Model *
 119  *********/
 120
 121 /************************************************************************/
 122 /* New model based on optimizations discussed during Pedro Velho's thesis*/
 123 /************************************************************************/
 124 /* @techreport{VELHO:2011:HAL-00646896:1, */
 125 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
 126 /*      title = {{Flow-level network models: have we reached the limits?}}, */
 127 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
 128 /*      type = {Rapport de recherche}, */
 129 /*      institution = {INRIA}, */
 130 /*      number = {RR-7821}, */
 131 /*      year = {2011}, */
 132 /*      month = Nov, */
 133 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
 134 /*  } */
 135 void surf_network_model_init_LegrandVelho(void)
 136 {
 137   if (surf_network_model)
 138     return;
 139
 140   surf_network_model = new NetworkCm02Model();
 141   net_define_callbacks();
 142   ModelPtr model = static_cast<ModelPtr>(surf_network_model);
 143   xbt_dynar_push(model_list, &model);
 144
 145   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",
 146                             13.01);
 147   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 148                             0.97);
 149   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 20537);
 150 }
 151
 152 /***************************************************************************/
 153 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 154 /***************************************************************************/
 155 /* @TechReport{      rr-lip2002-40, */
 156 /*   author        = {Henri Casanova and Loris Marchal}, */
 157 /*   institution   = {LIP}, */
 158 /*   title         = {A Network Model for Simulation of Grid Application}, */
 159 /*   number        = {2002-40}, */
 160 /*   month         = {oct}, */
 161 /*   year          = {2002} */
 162 /* } */
 163 void surf_network_model_init_CM02(void)
 164 {
 165
 166   if (surf_network_model)
 167     return;
 168
 169   surf_network_model = new NetworkCm02Model();
 170   net_define_callbacks();
 171   ModelPtr model = static_cast<ModelPtr>(surf_network_model);
 172   xbt_dynar_push(model_list, &model);
 173
 174   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 1.0);
 175   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 176                             1.0);
 177   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 0.0);
 178 }
 179
 180 /***************************************************************************/
 181 /* The models from Steven H. Low                                           */
 182 /***************************************************************************/
 183 /* @article{Low03,                                                         */
 184 /*   author={Steven H. Low},                                               */
 185 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
 186 /*   year={2003},                                                          */
 187 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
 188 /*    volume={11}, number={4},                                             */
 189 /*  }                                                                      */
 190 void surf_network_model_init_Reno(void)
 191 {
 192   if (surf_network_model)
 193     return;
 194
 195   surf_network_model = new NetworkCm02Model();
 196   net_define_callbacks();
 197   ModelPtr model = static_cast<ModelPtr>(surf_network_model);
 198   xbt_dynar_push(model_list, &model);
 199   lmm_set_default_protocol_function(func_reno_f, func_reno_fp,
 200                                     func_reno_fpi);
 201   surf_network_model->f_networkSolve = lagrange_solve;
 202
 203   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 204   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 205                             0.92);
 206   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 207 }
 208
 209
 210 void surf_network_model_init_Reno2(void)
 211 {
 212   if (surf_network_model)
 213     return;
 214
 215   surf_network_model = new NetworkCm02Model();
 216   net_define_callbacks();
 217   ModelPtr model = static_cast<ModelPtr>(surf_network_model);
 218   xbt_dynar_push(model_list, &model);
 219   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 220                                     func_reno2_fpi);
 221   surf_network_model->f_networkSolve = lagrange_solve;
 222
 223   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 224   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 225                             0.92);
 226   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S_parameter",
 227                             8775);
 228 }
 229
 230 void surf_network_model_init_Vegas(void)
 231 {
 232   if (surf_network_model)
 233     return;
 234
 235   surf_network_model = new NetworkCm02Model();
 236   net_define_callbacks();
 237   ModelPtr model = static_cast<ModelPtr>(surf_network_model);
 238   xbt_dynar_push(model_list, &model);
 239   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 240                                     func_vegas_fpi);
 241   surf_network_model->f_networkSolve = lagrange_solve;
 242
 243   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 244   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 245                             0.92);
 246   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 247 }
 248
 249 void NetworkCm02Model::initialize()
 250 {
 251   char *optim = xbt_cfg_get_string(_sg_cfg_set, "network/optim");
 252   int select =
 253       xbt_cfg_get_boolean(_sg_cfg_set, "network/maxmin_selective_update");
 254
 255   if (!strcmp(optim, "Full")) {
 256     p_updateMechanism = UM_FULL;
 257     m_selectiveUpdate = select;
 258   } else if (!strcmp(optim, "Lazy")) {
 259     p_updateMechanism = UM_LAZY;
 260     m_selectiveUpdate = 1;
 261     xbt_assert((select == 1)
 262                ||
 263                (xbt_cfg_is_default_value
 264                 (_sg_cfg_set, "network/maxmin_selective_update")),
 265                "Disabling selective update while using the lazy update mechanism is dumb!");
 266   } else {
 267     xbt_die("Unsupported optimization (%s) for this model", optim);
 268   }
 269
 270   if (!p_maxminSystem)
 271         p_maxminSystem = lmm_system_new(m_selectiveUpdate);
 272
 273   const char* lb_name = "__loopback__";
 274   routing_model_create(static_cast<ResourcePtr>(createResource(lb_name,
 275                                                    498000000, NULL, 0.000015, NULL,
 276                                                    SURF_RESOURCE_ON, NULL,
 277                                                    SURF_LINK_FATPIPE, NULL)));
 278
 279   if (p_updateMechanism == UM_LAZY) {
 280         p_actionHeap = xbt_heap_new(8, NULL);
 281         xbt_heap_set_update_callback(p_actionHeap, surf_action_lmm_update_index_heap);
 282         p_modifiedSet = new ActionLmmList();
 283         p_maxminSystem->keep_track = p_modifiedSet;
 284   }
 285
 286   m_haveGap = false;
 287 }
 288
 289 NetworkLinkPtr NetworkCm02Model::createResource(const char *name,
 290                                  double bw_initial,
 291                                  tmgr_trace_t bw_trace,
 292                                  double lat_initial,
 293                                  tmgr_trace_t lat_trace,
 294                                  e_surf_resource_state_t state_initial,
 295                                  tmgr_trace_t state_trace,
 296                                  e_surf_link_sharing_policy_t policy,
 297                                  xbt_dict_t properties)
 298 {
 299   xbt_assert(!xbt_lib_get_or_null(link_lib, name, SURF_LINK_LEVEL),
 300              "Link '%s' declared several times in the platform file.",
 301              name);
 302
 303   NetworkCm02LinkPtr nw_link =
 304                   new NetworkCm02Link(this, name, properties, p_maxminSystem, sg_bandwidth_factor * bw_initial, history,
 305                                                  state_initial, state_trace, bw_initial, bw_trace, lat_initial, lat_trace, policy);
 306
 307
 308   xbt_lib_set(link_lib, name, SURF_LINK_LEVEL, static_cast<ResourcePtr>(nw_link));
 309   XBT_DEBUG("Create link '%s'",name);
 310
 311   return nw_link;
 312 }
 313
 314 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
 315 {
 316   NetworkCm02ActionPtr action;
 317   while ((xbt_heap_size(p_actionHeap) > 0)
 318          && (double_equals(xbt_heap_maxkey(p_actionHeap), now, sg_surf_precision))) {
 319     action = (NetworkCm02ActionPtr) xbt_heap_pop(p_actionHeap);
 320     XBT_DEBUG("Something happened to action %p", action);
 321 #ifdef HAVE_TRACING
 322     if (TRACE_is_enabled()) {
 323       int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 324       int i;
 325       for (i = 0; i < n; i++){
 326         lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 327                                                             action->getVariable(),
 328                                                             i);
 329         NetworkCm02LinkPtr link = static_cast<NetworkCm02LinkPtr>(lmm_constraint_id(constraint));
 330         TRACE_surf_link_set_utilization(link->getName(),
 331                                         action->getCategory(),
 332                                         (lmm_variable_getvalue(action->getVariable())*
 333                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 334                                                 action->getVariable(),
 335                                                 i)),
 336                                         action->getLastUpdate(),
 337                                         now - action->getLastUpdate());
 338       }
 339     }
 340 #endif
 341
 342     // if I am wearing a latency hat
 343     if (action->getHat() == LATENCY) {
 344       XBT_DEBUG("Latency paid for action %p. Activating", action);
 345       lmm_update_variable_weight(p_maxminSystem, action->getVariable(), action->m_weight);
 346       action->heapRemove(p_actionHeap);
 347       action->refreshLastUpdate();
 348
 349         // if I am wearing a max_duration or normal hat
 350     } else if (action->getHat() == MAX_DURATION ||
 351         action->getHat() == NORMAL) {
 352         // no need to communicate anymore
 353         // assume that flows that reached max_duration have remaining of 0
 354       XBT_DEBUG("Action %p finished", action);
 355       action->setRemains(0);
 356       action->finish();
 357       action->setState(SURF_ACTION_DONE);
 358       action->heapRemove(p_actionHeap);
 359
 360       action->gapRemove();
 361     }
 362   }
 363   return;
 364 }
 365
 366 ActionPtr NetworkCm02Model::communicate(RoutingEdgePtr src, RoutingEdgePtr dst,
 367                                                 double size, double rate)
 368 {
 369   unsigned int i;
 370   void *_link;
 371   NetworkCm02LinkPtr link;
 372   int failed = 0;
 373   NetworkCm02ActionPtr action = NULL;
 374   double bandwidth_bound;
 375   double latency = 0.0;
 376   xbt_dynar_t back_route = NULL;
 377   int constraints_per_variable = 0;
 378
 379   xbt_dynar_t route = xbt_dynar_new(sizeof(RoutingEdgePtr), NULL);
 380
 381   XBT_IN("(%s,%s,%g,%g)", src->getName(), dst->getName(), size, rate);
 382
 383   routing_platf->getRouteAndLatency(src, dst, &route, &latency);
 384   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 385              "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 386              src->getName(), dst->getName());
 387
 388   xbt_dynar_foreach(route, i, _link) {
 389         link = static_cast<NetworkCm02LinkPtr>(_link);
 390     if (link->getState() == SURF_RESOURCE_OFF) {
 391       failed = 1;
 392       break;
 393     }
 394   }
 395   if (sg_network_crosstraffic == 1) {
 396           routing_platf->getRouteAndLatency(dst, src, &back_route, NULL);
 397     xbt_dynar_foreach(back_route, i, _link) {
 398       link = static_cast<NetworkCm02LinkPtr>(_link);
 399       if (link->getState() == SURF_RESOURCE_OFF) {
 400         failed = 1;
 401         break;
 402       }
 403     }
 404   }
 405
 406   action = new NetworkCm02Action(this, size, failed);
 407
 408 #ifdef HAVE_LATENCY_BOUND_TRACKING
 409   action->m_latencyLimited = 0;
 410 #endif
 411   action->m_weight = action->m_latency = latency;
 412
 413   action->m_rate = rate;
 414   if (p_updateMechanism == UM_LAZY) {
 415     action->m_indexHeap = -1;
 416     action->m_lastUpdate = surf_get_clock();
 417   }
 418
 419   bandwidth_bound = -1.0;
 420   if (sg_weight_S_parameter > 0) {
 421     xbt_dynar_foreach(route, i, _link) {
 422       link = static_cast<NetworkCm02LinkPtr>(_link);
 423       action->m_weight += sg_weight_S_parameter / link->getBandwidth();
 424     }
 425   }
 426   xbt_dynar_foreach(route, i, _link) {
 427         link = static_cast<NetworkCm02LinkPtr>(_link);
 428     double bb = bandwidthFactor(size) * link->getBandwidth(); //(link->p_power.peak * link->p_power.scale);
 429     bandwidth_bound =
 430         (bandwidth_bound < 0.0) ? bb : min(bandwidth_bound, bb);
 431   }
 432
 433   action->m_latCurrent = action->m_latency;
 434   action->m_latency *= latencyFactor(size);
 435   action->m_rate = bandwidthConstraint(action->m_rate, bandwidth_bound, size);
 436   if (m_haveGap) {
 437     xbt_assert(!xbt_dynar_is_empty(route),
 438                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 439
 440     link = *static_cast<NetworkCm02LinkPtr *>(xbt_dynar_get_ptr(route, 0));
 441     gapAppend(size, link, action);
 442     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 443               action, src->getName(), dst->getName(), action->m_senderGap,
 444               action->m_latency);
 445   }
 446
 447   constraints_per_variable = xbt_dynar_length(route);
 448   if (back_route != NULL)
 449     constraints_per_variable += xbt_dynar_length(back_route);
 450
 451   if (action->m_latency > 0) {
 452     action->p_variable = lmm_variable_new(p_maxminSystem, static_cast<ActionPtr>(action), 0.0, -1.0,
 453                          constraints_per_variable);
 454     if (p_updateMechanism == UM_LAZY) {
 455       // add to the heap the event when the latency is payed
 456       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 457                 action->m_latency + action->m_lastUpdate);
 458       action->heapInsert(p_actionHeap, action->m_latency + action->m_lastUpdate, xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 459     }
 460   } else
 461     action->p_variable = lmm_variable_new(p_maxminSystem, static_cast<ActionPtr>(action), 1.0, -1.0, constraints_per_variable);
 462
 463   if (action->m_rate < 0) {
 464     lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? sg_tcp_gamma / (2.0 * action->m_latCurrent) : -1.0);
 465   } else {
 466     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);
 467   }
 468
 469   xbt_dynar_foreach(route, i, _link) {
 470         link = static_cast<NetworkCm02LinkPtr>(_link);
 471     lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), 1.0);
 472   }
 473
 474   if (sg_network_crosstraffic == 1) {
 475     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 476     xbt_dynar_foreach(back_route, i, _link) {
 477       link = static_cast<NetworkCm02LinkPtr>(_link);
 478       lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), .05);
 479     }
 480   }
 481
 482   xbt_dynar_free(&route);
 483   XBT_OUT();
 484
 485   surf_callback_emit(networkCommunicateCallbacks, action, src, dst, size, rate);
 486   return action;
 487 }
 488
 489
 490
 491 /************
 492  * Resource *
 493  ************/
 494 NetworkCm02Link::NetworkCm02Link(NetworkCm02ModelPtr model, const char *name, xbt_dict_t props,
 495                                    lmm_system_t system,
 496                                    double constraint_value,
 497                                    tmgr_history_t history,
 498                                    e_surf_resource_state_t state_init,
 499                                    tmgr_trace_t state_trace,
 500                                    double metric_peak,
 501                                    tmgr_trace_t metric_trace,
 502                                    double lat_initial,
 503                                    tmgr_trace_t lat_trace,
 504                                    e_surf_link_sharing_policy_t policy)
 505 : NetworkLink(model, name, props, lmm_constraint_new(system, this, constraint_value), history, state_trace)
 506 {
 507   setState(state_init);
 508
 509   p_power.scale = 1.0;
 510   p_power.peak = metric_peak;
 511   if (metric_trace)
 512     p_power.event = tmgr_history_add_trace(history, metric_trace, 0.0, 0, static_cast<ResourcePtr>(this));
 513   else
 514     p_power.event = NULL;
 515
 516   m_latCurrent = lat_initial;
 517   if (lat_trace)
 518         p_latEvent = tmgr_history_add_trace(history, lat_trace, 0.0, 0, static_cast<ResourcePtr>(this));
 519
 520   if (policy == SURF_LINK_FATPIPE)
 521         lmm_constraint_shared(getConstraint());
 522 }
 523
 524
 525
 526 void NetworkCm02Link::updateState(tmgr_trace_event_t event_type,
 527                                       double value, double date)
 528 {
 529   /*   printf("[" "%g" "] Asking to update network card \"%s\" with value " */
 530   /*     "%g" " for event %p\n", surf_get_clock(), nw_link->name, */
 531   /*     value, event_type); */
 532
 533   if (event_type == p_power.event) {
 534     updateBandwidth(value, date);
 535     if (tmgr_trace_event_free(event_type))
 536       p_power.event = NULL;
 537   } else if (event_type == p_latEvent) {
 538     updateLatency(value, date);
 539     if (tmgr_trace_event_free(event_type))
 540       p_latEvent = NULL;
 541   } else if (event_type == p_stateEvent) {
 542     if (value > 0)
 543       setState(SURF_RESOURCE_ON);
 544     else {
 545       lmm_constraint_t cnst = getConstraint();
 546       lmm_variable_t var = NULL;
 547       lmm_element_t elem = NULL;
 548
 549       setState(SURF_RESOURCE_OFF);
 550       while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), cnst, &elem))) {
 551         ActionPtr action = (ActionPtr) lmm_variable_id(var);
 552
 553         if (action->getState() == SURF_ACTION_RUNNING ||
 554             action->getState() == SURF_ACTION_READY) {
 555           action->setFinishTime(date);
 556           action->setState(SURF_ACTION_FAILED);
 557         }
 558       }
 559     }
 560     if (tmgr_trace_event_free(event_type))
 561       p_stateEvent = NULL;
 562   } else {
 563     XBT_CRITICAL("Unknown event ! \n");
 564     xbt_abort();
 565   }
 566
 567   XBT_DEBUG
 568       ("There were a resource state event, need to update actions related to the constraint (%p)",
 569        getConstraint());
 570   return;
 571 }
 572
 573 void NetworkCm02Link::updateBandwidth(double value, double date){
 574   double delta = sg_weight_S_parameter / value - sg_weight_S_parameter /
 575                  (p_power.peak * p_power.scale);
 576   lmm_variable_t var = NULL;
 577   lmm_element_t elem = NULL;
 578   NetworkCm02ActionPtr action = NULL;
 579
 580   p_power.peak = value;
 581   lmm_update_constraint_bound(getModel()->getMaxminSystem(),
 582                               getConstraint(),
 583                               sg_bandwidth_factor *
 584                               (p_power.peak * p_power.scale));
 585 #ifdef HAVE_TRACING
 586   TRACE_surf_link_set_bandwidth(date, getName(), sg_bandwidth_factor * p_power.peak * p_power.scale);
 587 #endif
 588   if (sg_weight_S_parameter > 0) {
 589     while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), getConstraint(), &elem))) {
 590       action = (NetworkCm02ActionPtr) lmm_variable_id(var);
 591       action->m_weight += delta;
 592       if (!action->isSuspended())
 593         lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 594     }
 595   }
 596 }
 597
 598 void NetworkCm02Link::updateLatency(double value, double date){
 599   double delta = value - m_latCurrent;
 600   lmm_variable_t var = NULL;
 601   lmm_element_t elem = NULL;
 602   NetworkCm02ActionPtr action = NULL;
 603
 604   m_latCurrent = value;
 605   while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), getConstraint(), &elem))) {
 606     action = (NetworkCm02ActionPtr) lmm_variable_id(var);
 607     action->m_latCurrent += delta;
 608     action->m_weight += delta;
 609     if (action->m_rate < 0)
 610       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(), sg_tcp_gamma / (2.0 * action->m_latCurrent));
 611     else {
 612       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(),
 613                                 min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)));
 614
 615       if (action->m_rate < sg_tcp_gamma / (2.0 * action->m_latCurrent)) {
 616         XBT_INFO("Flow is limited BYBANDWIDTH");
 617       } else {
 618         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 619                  action->m_latCurrent);
 620       }
 621     }
 622     if (!action->isSuspended())
 623       lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 624   }
 625 }
 626
 627 /**********
 628  * Action *
 629  **********/
 630 void NetworkCm02Action::updateRemainingLazy(double now)
 631 {
 632   double delta = 0.0;
 633
 634   if (m_suspended != 0)
 635     return;
 636
 637   delta = now - m_lastUpdate;
 638
 639   if (m_remains > 0) {
 640     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
 641     double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
 642
 643     XBT_DEBUG("Updating action(%p): remains is now %f", this, m_remains);
 644   }
 645
 646   if (m_maxDuration != NO_MAX_DURATION)
 647     double_update(&m_maxDuration, delta, sg_surf_precision);
 648
 649   if (m_remains <= 0 &&
 650       (lmm_get_variable_weight(getVariable()) > 0)) {
 651     finish();
 652     setState(SURF_ACTION_DONE);
 653
 654     heapRemove(getModel()->getActionHeap());
 655   } else if (((m_maxDuration != NO_MAX_DURATION)
 656       && (m_maxDuration <= 0))) {
 657     finish();
 658     setState(SURF_ACTION_DONE);
 659     heapRemove(getModel()->getActionHeap());
 660   }
 661
 662   m_lastUpdate = now;
 663   m_lastValue = lmm_variable_getvalue(getVariable());
 664 }
 665 void NetworkCm02Action::recycle()
 666 {
 667   return;
 668 }
 669