src/surf/network_cm02.cpp

   1 /* Copyright (c) 2013-2015. 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 <algorithm>
   8
   9 #include "network_cm02.hpp"
  10 #include "maxmin_private.hpp"
  11 #include "simgrid/sg_config.h"
  12 #include "src/surf/platform.hpp"
  13
  14 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
  15
  16 double sg_sender_gap = 0.0;
  17 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
  18 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
  19 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
  20
  21 double sg_tcp_gamma = 0.0;
  22 int sg_network_crosstraffic = 0;
  23
  24 /*************
  25  * CallBacks *
  26  *************/
  27
  28 void net_define_callbacks(void)
  29 {
  30   /* Figuring out the network links */
  31   simgrid::surf::on_link.connect(netlink_parse_init);
  32   simgrid::surf::on_postparse.connect([]() {
  33     surf_network_model->addTraces();
  34   });
  35 }
  36
  37 /*********
  38  * Model *
  39  *********/
  40
  41 /************************************************************************/
  42 /* New model based on optimizations discussed during Pedro Velho's thesis*/
  43 /************************************************************************/
  44 /* @techreport{VELHO:2011:HAL-00646896:1, */
  45 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
  46 /*      title = {{Flow-level network models: have we reached the limits?}}, */
  47 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
  48 /*      type = {Rapport de recherche}, */
  49 /*      institution = {INRIA}, */
  50 /*      number = {RR-7821}, */
  51 /*      year = {2011}, */
  52 /*      month = Nov, */
  53 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
  54 /*  } */
  55 void surf_network_model_init_LegrandVelho(void)
  56 {
  57   if (surf_network_model)
  58     return;
  59
  60   surf_network_model = new simgrid::surf::NetworkCm02Model();
  61   net_define_callbacks();
  62   simgrid::surf::Model *model = surf_network_model;
  63   xbt_dynar_push(all_existing_models, &model);
  64
  65   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",
  66                             13.01);
  67   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
  68                             0.97);
  69   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 20537);
  70 }
  71
  72 /***************************************************************************/
  73 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
  74 /***************************************************************************/
  75 /* @TechReport{      rr-lip2002-40, */
  76 /*   author        = {Henri Casanova and Loris Marchal}, */
  77 /*   institution   = {LIP}, */
  78 /*   title         = {A Network Model for Simulation of Grid Application}, */
  79 /*   number        = {2002-40}, */
  80 /*   month         = {oct}, */
  81 /*   year          = {2002} */
  82 /* } */
  83 void surf_network_model_init_CM02(void)
  84 {
  85
  86   if (surf_network_model)
  87     return;
  88
  89   surf_network_model = new simgrid::surf::NetworkCm02Model();
  90   xbt_dynar_push(all_existing_models, &surf_network_model);
  91   net_define_callbacks();
  92
  93   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 1.0);
  94   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 1.0);
  95   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 0.0);
  96 }
  97
  98 /***************************************************************************/
  99 /* The models from Steven H. Low                                           */
 100 /***************************************************************************/
 101 /* @article{Low03,                                                         */
 102 /*   author={Steven H. Low},                                               */
 103 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
 104 /*   year={2003},                                                          */
 105 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
 106 /*    volume={11}, number={4},                                             */
 107 /*  }                                                                      */
 108 void surf_network_model_init_Reno(void)
 109 {
 110   if (surf_network_model)
 111     return;
 112
 113   surf_network_model = new simgrid::surf::NetworkCm02Model();
 114   xbt_dynar_push(all_existing_models, &surf_network_model);
 115   net_define_callbacks();
 116   lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
 117   surf_network_model->f_networkSolve = lagrange_solve;
 118
 119   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 120   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 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 simgrid::surf::NetworkCm02Model();
 131   xbt_dynar_push(all_existing_models, &surf_network_model);
 132   net_define_callbacks();
 133   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp, func_reno2_fpi);
 134   surf_network_model->f_networkSolve = lagrange_solve;
 135
 136   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 137   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
 138   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 139 }
 140
 141 void surf_network_model_init_Vegas(void)
 142 {
 143   if (surf_network_model)
 144     return;
 145
 146   surf_network_model = new simgrid::surf::NetworkCm02Model();
 147   xbt_dynar_push(all_existing_models, &surf_network_model);
 148   net_define_callbacks();
 149   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp, func_vegas_fpi);
 150   surf_network_model->f_networkSolve = lagrange_solve;
 151
 152   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 153   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
 154   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 155 }
 156
 157 namespace simgrid {
 158 namespace surf {
 159
 160 NetworkCm02Model::NetworkCm02Model()
 161   :NetworkModel()
 162 {
 163   char *optim = xbt_cfg_get_string(_sg_cfg_set, "network/optim");
 164   int select =
 165       xbt_cfg_get_boolean(_sg_cfg_set, "network/maxmin_selective_update");
 166
 167   if (!strcmp(optim, "Full")) {
 168     p_updateMechanism = UM_FULL;
 169     m_selectiveUpdate = select;
 170   } else if (!strcmp(optim, "Lazy")) {
 171     p_updateMechanism = UM_LAZY;
 172     m_selectiveUpdate = 1;
 173     xbt_assert((select == 1) || (xbt_cfg_is_default_value(_sg_cfg_set, "network/maxmin_selective_update")),
 174                "Disabling selective update while using the lazy update mechanism is dumb!");
 175   } else {
 176     xbt_die("Unsupported optimization (%s) for this model", optim);
 177   }
 178
 179   if (!p_maxminSystem)
 180   p_maxminSystem = lmm_system_new(m_selectiveUpdate);
 181
 182   routing_model_create(createLink("__loopback__",
 183                                 498000000, NULL, 0.000015, NULL,
 184                                 1 /*SURF_RESOURCE_ON*/, NULL,
 185                                 SURF_LINK_FATPIPE, NULL));
 186
 187   if (p_updateMechanism == UM_LAZY) {
 188   p_actionHeap = xbt_heap_new(8, NULL);
 189   xbt_heap_set_update_callback(p_actionHeap, surf_action_lmm_update_index_heap);
 190   p_modifiedSet = new ActionLmmList();
 191   p_maxminSystem->keep_track = p_modifiedSet;
 192   }
 193 }
 194
 195 Link* NetworkCm02Model::createLink(const char *name,
 196                                  double bw_initial,
 197                                  tmgr_trace_t bw_trace,
 198                                  double lat_initial,
 199                                  tmgr_trace_t lat_trace,
 200                                  int initiallyOn,
 201                                  tmgr_trace_t state_trace,
 202                                  e_surf_link_sharing_policy_t policy,
 203                                  xbt_dict_t properties)
 204 {
 205   xbt_assert(NULL == Link::byName(name),
 206              "Link '%s' declared several times in the platform",
 207              name);
 208
 209   Link* link = new NetworkCm02Link(this, name, properties, p_maxminSystem, sg_bandwidth_factor * bw_initial,
 210                      initiallyOn, state_trace, bw_initial, bw_trace, lat_initial, lat_trace, policy);
 211   Link::onCreation(link);
 212   return link;
 213 }
 214
 215 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
 216 {
 217   NetworkCm02Action *action;
 218   while ((xbt_heap_size(p_actionHeap) > 0)
 219          && (double_equals(xbt_heap_maxkey(p_actionHeap), now, sg_surf_precision))) {
 220     action = static_cast<NetworkCm02Action*> (xbt_heap_pop(p_actionHeap));
 221     XBT_DEBUG("Something happened to action %p", action);
 222     if (TRACE_is_enabled()) {
 223       int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 224       int i;
 225       for (i = 0; i < n; i++){
 226         lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 227                                                             action->getVariable(),
 228                                                             i);
 229         NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 230         TRACE_surf_link_set_utilization(link->getName(),
 231                                         action->getCategory(),
 232                                         (lmm_variable_getvalue(action->getVariable())*
 233                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 234                                                 action->getVariable(),
 235                                                 i)),
 236                                         action->getLastUpdate(),
 237                                         now - action->getLastUpdate());
 238       }
 239     }
 240
 241     // if I am wearing a latency hat
 242     if (action->getHat() == LATENCY) {
 243       XBT_DEBUG("Latency paid for action %p. Activating", action);
 244       lmm_update_variable_weight(p_maxminSystem, action->getVariable(), action->m_weight);
 245       action->heapRemove(p_actionHeap);
 246       action->refreshLastUpdate();
 247
 248         // if I am wearing a max_duration or normal hat
 249     } else if (action->getHat() == MAX_DURATION ||
 250         action->getHat() == NORMAL) {
 251         // no need to communicate anymore
 252         // assume that flows that reached max_duration have remaining of 0
 253       XBT_DEBUG("Action %p finished", action);
 254       action->setRemains(0);
 255       action->finish();
 256       action->setState(SURF_ACTION_DONE);
 257       action->heapRemove(p_actionHeap);
 258
 259       action->gapRemove();
 260     }
 261   }
 262   return;
 263 }
 264
 265
 266 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
 267 {
 268   NetworkCm02Action *action;
 269   ActionList *running_actions = getRunningActionSet();
 270
 271   for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
 272      ; it != itend ; it=itNext) {
 273   ++itNext;
 274
 275     action = static_cast<NetworkCm02Action*> (&*it);
 276     XBT_DEBUG("Something happened to action %p", action);
 277       double deltap = delta;
 278       if (action->m_latency > 0) {
 279         if (action->m_latency > deltap) {
 280           double_update(&(action->m_latency), deltap, sg_surf_precision);
 281           deltap = 0.0;
 282         } else {
 283           double_update(&(deltap), action->m_latency, sg_surf_precision);
 284           action->m_latency = 0.0;
 285         }
 286         if (action->m_latency == 0.0 && !(action->isSuspended()))
 287           lmm_update_variable_weight(p_maxminSystem, action->getVariable(),
 288               action->m_weight);
 289       }
 290       if (TRACE_is_enabled()) {
 291         int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 292         int i;
 293         for (i = 0; i < n; i++){
 294           lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 295                                                             action->getVariable(),
 296                                                             i);
 297           NetworkCm02Link* link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 298           TRACE_surf_link_set_utilization(link->getName(),
 299                                         action->getCategory(),
 300                                         (lmm_variable_getvalue(action->getVariable())*
 301                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 302                                                 action->getVariable(),
 303                                                 i)),
 304                                         action->getLastUpdate(),
 305                                         now - action->getLastUpdate());
 306         }
 307       }
 308       if (!lmm_get_number_of_cnst_from_var
 309           (p_maxminSystem, action->getVariable())) {
 310         /* There is actually no link used, hence an infinite bandwidth.
 311          * This happens often when using models like vivaldi.
 312          * In such case, just make sure that the action completes immediately.
 313          */
 314         action->updateRemains(action->getRemains());
 315       }
 316     action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
 317
 318     if (action->getMaxDuration() != NO_MAX_DURATION)
 319       action->updateMaxDuration(delta);
 320
 321     if ((action->getRemains() <= 0) &&
 322         (lmm_get_variable_weight(action->getVariable()) > 0)) {
 323       action->finish();
 324       action->setState(SURF_ACTION_DONE);
 325       action->gapRemove();
 326     } else if (((action->getMaxDuration() != NO_MAX_DURATION)
 327         && (action->getMaxDuration() <= 0))) {
 328       action->finish();
 329       action->setState(SURF_ACTION_DONE);
 330       action->gapRemove();
 331     }
 332   }
 333   return;
 334 }
 335
 336 Action *NetworkCm02Model::communicate(NetCard *src, NetCard *dst,
 337                                                 double size, double rate)
 338 {
 339   unsigned int i;
 340   void *_link;
 341   NetworkCm02Link *link;
 342   int failed = 0;
 343   NetworkCm02Action *action = NULL;
 344   double bandwidth_bound;
 345   double latency = 0.0;
 346   xbt_dynar_t back_route = NULL;
 347   int constraints_per_variable = 0;
 348
 349   xbt_dynar_t route = xbt_dynar_new(sizeof(NetCard*), NULL);
 350
 351   XBT_IN("(%s,%s,%g,%g)", src->getName(), dst->getName(), size, rate);
 352
 353   routing_platf->getRouteAndLatency(src, dst, &route, &latency);
 354   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 355              "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
 356              src->getName(), dst->getName());
 357
 358   xbt_dynar_foreach(route, i, _link) {
 359   link = static_cast<NetworkCm02Link*>(_link);
 360     if (link->isOff()) {
 361       failed = 1;
 362       break;
 363     }
 364   }
 365   if (sg_network_crosstraffic == 1) {
 366     routing_platf->getRouteAndLatency(dst, src, &back_route, NULL);
 367     xbt_dynar_foreach(back_route, i, _link) {
 368       link = static_cast<NetworkCm02Link*>(_link);
 369       if (link->isOff()) {
 370         failed = 1;
 371         break;
 372       }
 373     }
 374   }
 375
 376   action = new NetworkCm02Action(this, size, failed);
 377
 378 #ifdef HAVE_LATENCY_BOUND_TRACKING
 379   action->m_latencyLimited = 0;
 380 #endif
 381   action->m_weight = action->m_latency = latency;
 382
 383   action->m_rate = rate;
 384   if (p_updateMechanism == UM_LAZY) {
 385     action->m_indexHeap = -1;
 386     action->m_lastUpdate = surf_get_clock();
 387   }
 388
 389   bandwidth_bound = -1.0;
 390   if (sg_weight_S_parameter > 0) {
 391     xbt_dynar_foreach(route, i, _link) {
 392       link = static_cast<NetworkCm02Link*>(_link);
 393       action->m_weight += sg_weight_S_parameter / link->getBandwidth();
 394     }
 395   }
 396   xbt_dynar_foreach(route, i, _link) {
 397   link = static_cast<NetworkCm02Link*>(_link);
 398     double bb = bandwidthFactor(size) * link->getBandwidth();
 399     bandwidth_bound =
 400         (bandwidth_bound < 0.0) ? bb : std::min(bandwidth_bound, bb);
 401   }
 402
 403   action->m_latCurrent = action->m_latency;
 404   action->m_latency *= latencyFactor(size);
 405   action->m_rate = bandwidthConstraint(action->m_rate, bandwidth_bound, size);
 406   if (m_haveGap) {
 407     xbt_assert(!xbt_dynar_is_empty(route),
 408                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 409
 410     link = *static_cast<NetworkCm02Link **>(xbt_dynar_get_ptr(route, 0));
 411     gapAppend(size, link, action);
 412     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 413               action, src->getName(), dst->getName(), action->m_senderGap,
 414               action->m_latency);
 415   }
 416
 417   constraints_per_variable = xbt_dynar_length(route);
 418   if (back_route != NULL)
 419     constraints_per_variable += xbt_dynar_length(back_route);
 420
 421   if (action->m_latency > 0) {
 422     action->p_variable = lmm_variable_new(p_maxminSystem, action, 0.0, -1.0,
 423                          constraints_per_variable);
 424     if (p_updateMechanism == UM_LAZY) {
 425       // add to the heap the event when the latency is payed
 426       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 427                 action->m_latency + action->m_lastUpdate);
 428       action->heapInsert(p_actionHeap, action->m_latency + action->m_lastUpdate, xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 429     }
 430   } else
 431     action->p_variable = lmm_variable_new(p_maxminSystem, action, 1.0, -1.0, constraints_per_variable);
 432
 433   if (action->m_rate < 0) {
 434     lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? sg_tcp_gamma / (2.0 * action->m_latCurrent) : -1.0);
 435   } else {
 436     lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? std::min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)) : action->m_rate);
 437   }
 438
 439   xbt_dynar_foreach(route, i, _link) {
 440   link = static_cast<NetworkCm02Link*>(_link);
 441     lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), 1.0);
 442   }
 443
 444   if (sg_network_crosstraffic == 1) {
 445     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 446     xbt_dynar_foreach(back_route, i, _link) {
 447       link = static_cast<NetworkCm02Link*>(_link);
 448       lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), .05);
 449     }
 450     lmm_variable_concurrency_share_set(action->getVariable(),2);
 451   }
 452
 453   xbt_dynar_free(&route);
 454   XBT_OUT();
 455
 456   networkCommunicateCallbacks(action, src, dst, size, rate);
 457   return action;
 458 }
 459
 460 void NetworkCm02Model::addTraces(){
 461   xbt_dict_cursor_t cursor = NULL;
 462   char *trace_name, *elm;
 463
 464   static int called = 0;
 465   if (called)
 466     return;
 467   called = 1;
 468
 469   /* connect all traces relative to network */
 470   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 471     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
 472     NetworkCm02Link *link = static_cast<NetworkCm02Link*>( Link::byName(elm) );
 473
 474     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 475                trace_name, elm);
 476     xbt_assert(trace,
 477                "Cannot connect trace %s to link %s: trace undefined",
 478                trace_name, elm);
 479
 480     link->m_stateEvent = future_evt_set->add_trace(trace, 0.0, link);
 481   }
 482
 483   xbt_dict_foreach(trace_connect_list_link_bw, cursor, trace_name, elm) {
 484     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
 485     NetworkCm02Link *link = static_cast<NetworkCm02Link*>( Link::byName(elm) );
 486
 487     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 488                trace_name, elm);
 489     xbt_assert(trace,
 490                "Cannot connect trace %s to link %s: trace undefined",
 491                trace_name, elm);
 492
 493     link->m_bandwidth.event = future_evt_set->add_trace(trace, 0.0, link);
 494   }
 495
 496   xbt_dict_foreach(trace_connect_list_link_lat, cursor, trace_name, elm) {
 497     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
 498     NetworkCm02Link *link = static_cast<NetworkCm02Link*>(Link::byName(elm));;
 499
 500     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 501                trace_name, elm);
 502     xbt_assert(trace,
 503                "Cannot connect trace %s to link %s: trace undefined",
 504                trace_name, elm);
 505
 506     link->m_latency.event = future_evt_set->add_trace(trace, 0.0, link);
 507   }
 508 }
 509
 510 /************
 511  * Resource *
 512  ************/
 513 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model *model, const char *name, xbt_dict_t props,
 514                              lmm_system_t system,
 515                              double constraint_value,
 516                              int initiallyOn, tmgr_trace_t state_trace,
 517                              double bw_peak, tmgr_trace_t bw_trace,
 518                              double lat_initial, tmgr_trace_t lat_trace,
 519                              e_surf_link_sharing_policy_t policy)
 520 : Link(model, name, props, lmm_constraint_new(system, this, constraint_value), state_trace)
 521 {
 522   if (initiallyOn)
 523     turnOn();
 524   else
 525     turnOff();
 526
 527   m_bandwidth.scale = 1.0;
 528   m_bandwidth.peak = bw_peak;
 529   if (bw_trace)
 530     m_bandwidth.event = future_evt_set->add_trace(bw_trace, 0.0, this);
 531   else
 532     m_bandwidth.event = NULL;
 533
 534   m_latency.scale = 1.0;
 535   m_latency.peak = lat_initial;
 536   if (lat_trace)
 537     m_latency.event = future_evt_set->add_trace(lat_trace, 0.0, this);
 538
 539   if (policy == SURF_LINK_FATPIPE)
 540   lmm_constraint_shared(getConstraint());
 541 }
 542
 543
 544
 545 void NetworkCm02Link::apply_event(tmgr_trace_iterator_t triggered, double value)
 546 {
 547
 548   /* Find out which of my iterators was triggered, and react accordingly */
 549   if (triggered == m_bandwidth.event) {
 550     updateBandwidth(value);
 551     tmgr_trace_event_unref(&m_bandwidth.event);
 552   } else if (triggered == m_latency.event) {
 553     updateLatency(value);
 554     tmgr_trace_event_unref(&m_latency.event);
 555   } else if (triggered == m_stateEvent) {
 556     if (value > 0)
 557       turnOn();
 558     else {
 559       lmm_variable_t var = NULL;
 560       lmm_element_t elem = NULL;
 561       double now = surf_get_clock();
 562
 563       turnOff();
 564       while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), getConstraint(), &elem))) {
 565         Action *action = static_cast<Action*>( lmm_variable_id(var) );
 566
 567         if (action->getState() == SURF_ACTION_RUNNING ||
 568             action->getState() == SURF_ACTION_READY) {
 569           action->setFinishTime(now);
 570           action->setState(SURF_ACTION_FAILED);
 571         }
 572       }
 573     }
 574     tmgr_trace_event_unref(&m_stateEvent);
 575   } else {
 576     xbt_die("Unknown event!\n");
 577   }
 578
 579   XBT_DEBUG
 580       ("There was a resource state event, need to update actions related to the constraint (%p)",
 581        getConstraint());
 582 }
 583
 584 void NetworkCm02Link::updateBandwidth(double value) {
 585   double delta = sg_weight_S_parameter / value - sg_weight_S_parameter /
 586                  (m_bandwidth.peak * m_bandwidth.scale);
 587   lmm_variable_t var = NULL;
 588   lmm_element_t elem = NULL;
 589   lmm_element_t nextelem = NULL;
 590   int numelem = 0;
 591
 592   NetworkCm02Action *action = NULL;
 593
 594   m_bandwidth.peak = value;
 595   lmm_update_constraint_bound(getModel()->getMaxminSystem(),
 596                               getConstraint(),
 597                               sg_bandwidth_factor *
 598                               (m_bandwidth.peak * m_bandwidth.scale));
 599   TRACE_surf_link_set_bandwidth(surf_get_clock(), getName(), sg_bandwidth_factor * m_bandwidth.peak * m_bandwidth.scale);
 600   if (sg_weight_S_parameter > 0) {
 601     while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 602       action = (NetworkCm02Action*) lmm_variable_id(var);
 603       action->m_weight += delta;
 604       if (!action->isSuspended())
 605         lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 606     }
 607   }
 608 }
 609
 610 void NetworkCm02Link::updateLatency(double value){
 611   double delta = value - m_latency.peak;
 612   lmm_variable_t var = NULL;
 613   lmm_element_t elem = NULL;
 614   lmm_element_t nextelem = NULL;
 615   int numelem = 0;
 616   NetworkCm02Action *action = NULL;
 617
 618   m_latency.peak = value;
 619   while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 620     action = (NetworkCm02Action*) lmm_variable_id(var);
 621     action->m_latCurrent += delta;
 622     action->m_weight += delta;
 623     if (action->m_rate < 0)
 624       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(), sg_tcp_gamma / (2.0 * action->m_latCurrent));
 625     else {
 626       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(),
 627                                 std::min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)));
 628
 629       if (action->m_rate < sg_tcp_gamma / (2.0 * action->m_latCurrent)) {
 630         XBT_INFO("Flow is limited BYBANDWIDTH");
 631       } else {
 632         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 633                  action->m_latCurrent);
 634       }
 635     }
 636     if (!action->isSuspended())
 637       lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 638   }
 639 }
 640
 641 /**********
 642  * Action *
 643  **********/
 644 void NetworkCm02Action::updateRemainingLazy(double now)
 645 {
 646   double delta = 0.0;
 647
 648   if (m_suspended != 0)
 649     return;
 650
 651   delta = now - m_lastUpdate;
 652
 653   if (m_remains > 0) {
 654     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
 655     double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
 656
 657     XBT_DEBUG("Updating action(%p): remains is now %f", this, m_remains);
 658   }
 659
 660   if (m_maxDuration != NO_MAX_DURATION)
 661     double_update(&m_maxDuration, delta, sg_surf_precision);
 662
 663   if (m_remains <= 0 &&
 664       (lmm_get_variable_weight(getVariable()) > 0)) {
 665     finish();
 666     setState(SURF_ACTION_DONE);
 667
 668     heapRemove(getModel()->getActionHeap());
 669   } else if (((m_maxDuration != NO_MAX_DURATION)
 670       && (m_maxDuration <= 0))) {
 671     finish();
 672     setState(SURF_ACTION_DONE);
 673     heapRemove(getModel()->getActionHeap());
 674   }
 675
 676   m_lastUpdate = now;
 677   m_lastValue = lmm_variable_getvalue(getVariable());
 678 }
 679
 680 }
 681 }