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)
 174                ||
 175                (xbt_cfg_is_default_value
 176                 (_sg_cfg_set, "network/maxmin_selective_update")),
 177                "Disabling selective update while using the lazy update mechanism is dumb!");
 178   } else {
 179     xbt_die("Unsupported optimization (%s) for this model", optim);
 180   }
 181
 182   if (!p_maxminSystem)
 183         p_maxminSystem = lmm_system_new(m_selectiveUpdate);
 184
 185   routing_model_create(createLink("__loopback__",
 186                                       498000000, NULL, 0.000015, NULL,
 187                                       1 /*SURF_RESOURCE_ON*/, NULL,
 188                                       SURF_LINK_FATPIPE, NULL));
 189
 190   if (p_updateMechanism == UM_LAZY) {
 191         p_actionHeap = xbt_heap_new(8, NULL);
 192         xbt_heap_set_update_callback(p_actionHeap, surf_action_lmm_update_index_heap);
 193         p_modifiedSet = new ActionLmmList();
 194         p_maxminSystem->keep_track = p_modifiedSet;
 195   }
 196 }
 197
 198 Link* NetworkCm02Model::createLink(const char *name,
 199                                  double bw_initial,
 200                                  tmgr_trace_t bw_trace,
 201                                  double lat_initial,
 202                                  tmgr_trace_t lat_trace,
 203                                  int initiallyOn,
 204                                  tmgr_trace_t state_trace,
 205                                  e_surf_link_sharing_policy_t policy,
 206                                  xbt_dict_t properties)
 207 {
 208   xbt_assert(NULL == Link::byName(name),
 209              "Link '%s' declared several times in the platform",
 210              name);
 211
 212   Link* link = new NetworkCm02Link(this, name, properties, p_maxminSystem, sg_bandwidth_factor * bw_initial, history,
 213                                              initiallyOn, state_trace, bw_initial, bw_trace, lat_initial, lat_trace, policy);
 214   Link::onCreation(link);
 215   return link;
 216 }
 217
 218 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
 219 {
 220   NetworkCm02Action *action;
 221   while ((xbt_heap_size(p_actionHeap) > 0)
 222          && (double_equals(xbt_heap_maxkey(p_actionHeap), now, sg_surf_precision))) {
 223     action = static_cast<NetworkCm02Action*> (xbt_heap_pop(p_actionHeap));
 224     XBT_DEBUG("Something happened to action %p", action);
 225     if (TRACE_is_enabled()) {
 226       int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 227       int i;
 228       for (i = 0; i < n; i++){
 229         lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 230                                                             action->getVariable(),
 231                                                             i);
 232         NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 233         TRACE_surf_link_set_utilization(link->getName(),
 234                                         action->getCategory(),
 235                                         (lmm_variable_getvalue(action->getVariable())*
 236                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 237                                                 action->getVariable(),
 238                                                 i)),
 239                                         action->getLastUpdate(),
 240                                         now - action->getLastUpdate());
 241       }
 242     }
 243
 244     // if I am wearing a latency hat
 245     if (action->getHat() == LATENCY) {
 246       XBT_DEBUG("Latency paid for action %p. Activating", action);
 247       lmm_update_variable_weight(p_maxminSystem, action->getVariable(), action->m_weight);
 248       action->heapRemove(p_actionHeap);
 249       action->refreshLastUpdate();
 250
 251         // if I am wearing a max_duration or normal hat
 252     } else if (action->getHat() == MAX_DURATION ||
 253         action->getHat() == NORMAL) {
 254         // no need to communicate anymore
 255         // assume that flows that reached max_duration have remaining of 0
 256       XBT_DEBUG("Action %p finished", action);
 257       action->setRemains(0);
 258       action->finish();
 259       action->setState(SURF_ACTION_DONE);
 260       action->heapRemove(p_actionHeap);
 261
 262       action->gapRemove();
 263     }
 264   }
 265   return;
 266 }
 267
 268
 269 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
 270 {
 271   NetworkCm02Action *action;
 272   ActionList *running_actions = getRunningActionSet();
 273
 274   for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
 275      ; it != itend ; it=itNext) {
 276         ++itNext;
 277
 278     action = static_cast<NetworkCm02Action*> (&*it);
 279     XBT_DEBUG("Something happened to action %p", action);
 280       double deltap = delta;
 281       if (action->m_latency > 0) {
 282         if (action->m_latency > deltap) {
 283           double_update(&(action->m_latency), deltap, sg_surf_precision);
 284           deltap = 0.0;
 285         } else {
 286           double_update(&(deltap), action->m_latency, sg_surf_precision);
 287           action->m_latency = 0.0;
 288         }
 289         if (action->m_latency == 0.0 && !(action->isSuspended()))
 290           lmm_update_variable_weight(p_maxminSystem, action->getVariable(),
 291               action->m_weight);
 292       }
 293       if (TRACE_is_enabled()) {
 294         int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 295         int i;
 296         for (i = 0; i < n; i++){
 297           lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 298                                                             action->getVariable(),
 299                                                             i);
 300           NetworkCm02Link* link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 301           TRACE_surf_link_set_utilization(link->getName(),
 302                                         action->getCategory(),
 303                                         (lmm_variable_getvalue(action->getVariable())*
 304                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 305                                                 action->getVariable(),
 306                                                 i)),
 307                                         action->getLastUpdate(),
 308                                         now - action->getLastUpdate());
 309         }
 310       }
 311       if (!lmm_get_number_of_cnst_from_var
 312           (p_maxminSystem, action->getVariable())) {
 313         /* There is actually no link used, hence an infinite bandwidth.
 314          * This happens often when using models like vivaldi.
 315          * In such case, just make sure that the action completes immediately.
 316          */
 317         action->updateRemains(action->getRemains());
 318       }
 319     action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
 320
 321     if (action->getMaxDuration() != NO_MAX_DURATION)
 322       action->updateMaxDuration(delta);
 323
 324     if ((action->getRemains() <= 0) &&
 325         (lmm_get_variable_weight(action->getVariable()) > 0)) {
 326       action->finish();
 327       action->setState(SURF_ACTION_DONE);
 328       action->gapRemove();
 329     } else if (((action->getMaxDuration() != NO_MAX_DURATION)
 330         && (action->getMaxDuration() <= 0))) {
 331       action->finish();
 332       action->setState(SURF_ACTION_DONE);
 333       action->gapRemove();
 334     }
 335   }
 336   return;
 337 }
 338
 339 Action *NetworkCm02Model::communicate(NetCard *src, NetCard *dst,
 340                                                 double size, double rate)
 341 {
 342   unsigned int i;
 343   void *_link;
 344   NetworkCm02Link *link;
 345   int failed = 0;
 346   NetworkCm02Action *action = NULL;
 347   double bandwidth_bound;
 348   double latency = 0.0;
 349   xbt_dynar_t back_route = NULL;
 350   int constraints_per_variable = 0;
 351
 352   xbt_dynar_t route = xbt_dynar_new(sizeof(NetCard*), NULL);
 353
 354   XBT_IN("(%s,%s,%g,%g)", src->getName(), dst->getName(), size, rate);
 355
 356   routing_platf->getRouteAndLatency(src, dst, &route, &latency);
 357   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 358              "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
 359              src->getName(), dst->getName());
 360
 361   xbt_dynar_foreach(route, i, _link) {
 362         link = static_cast<NetworkCm02Link*>(_link);
 363     if (link->isOff()) {
 364       failed = 1;
 365       break;
 366     }
 367   }
 368   if (sg_network_crosstraffic == 1) {
 369           routing_platf->getRouteAndLatency(dst, src, &back_route, NULL);
 370     xbt_dynar_foreach(back_route, i, _link) {
 371       link = static_cast<NetworkCm02Link*>(_link);
 372       if (link->isOff()) {
 373         failed = 1;
 374         break;
 375       }
 376     }
 377   }
 378
 379   action = new NetworkCm02Action(this, size, failed);
 380
 381 #ifdef HAVE_LATENCY_BOUND_TRACKING
 382   action->m_latencyLimited = 0;
 383 #endif
 384   action->m_weight = action->m_latency = latency;
 385
 386   action->m_rate = rate;
 387   if (p_updateMechanism == UM_LAZY) {
 388     action->m_indexHeap = -1;
 389     action->m_lastUpdate = surf_get_clock();
 390   }
 391
 392   bandwidth_bound = -1.0;
 393   if (sg_weight_S_parameter > 0) {
 394     xbt_dynar_foreach(route, i, _link) {
 395       link = static_cast<NetworkCm02Link*>(_link);
 396       action->m_weight += sg_weight_S_parameter / link->getBandwidth();
 397     }
 398   }
 399   xbt_dynar_foreach(route, i, _link) {
 400         link = static_cast<NetworkCm02Link*>(_link);
 401     double bb = bandwidthFactor(size) * link->getBandwidth();
 402     bandwidth_bound =
 403         (bandwidth_bound < 0.0) ? bb : std::min(bandwidth_bound, bb);
 404   }
 405
 406   action->m_latCurrent = action->m_latency;
 407   action->m_latency *= latencyFactor(size);
 408   action->m_rate = bandwidthConstraint(action->m_rate, bandwidth_bound, size);
 409   if (m_haveGap) {
 410     xbt_assert(!xbt_dynar_is_empty(route),
 411                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 412
 413     link = *static_cast<NetworkCm02Link **>(xbt_dynar_get_ptr(route, 0));
 414     gapAppend(size, link, action);
 415     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 416               action, src->getName(), dst->getName(), action->m_senderGap,
 417               action->m_latency);
 418   }
 419
 420   constraints_per_variable = xbt_dynar_length(route);
 421   if (back_route != NULL)
 422     constraints_per_variable += xbt_dynar_length(back_route);
 423
 424   if (action->m_latency > 0) {
 425     action->p_variable = lmm_variable_new(p_maxminSystem, action, 0.0, -1.0,
 426                          constraints_per_variable);
 427     if (p_updateMechanism == UM_LAZY) {
 428       // add to the heap the event when the latency is payed
 429       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 430                 action->m_latency + action->m_lastUpdate);
 431       action->heapInsert(p_actionHeap, action->m_latency + action->m_lastUpdate, xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 432     }
 433   } else
 434     action->p_variable = lmm_variable_new(p_maxminSystem, action, 1.0, -1.0, constraints_per_variable);
 435
 436   if (action->m_rate < 0) {
 437     lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? sg_tcp_gamma / (2.0 * action->m_latCurrent) : -1.0);
 438   } else {
 439     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);
 440   }
 441
 442   xbt_dynar_foreach(route, i, _link) {
 443         link = static_cast<NetworkCm02Link*>(_link);
 444     lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), 1.0);
 445   }
 446
 447   if (sg_network_crosstraffic == 1) {
 448     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 449     xbt_dynar_foreach(back_route, i, _link) {
 450       link = static_cast<NetworkCm02Link*>(_link);
 451       lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), .05);
 452     }
 453   }
 454
 455   xbt_dynar_free(&route);
 456   XBT_OUT();
 457
 458   networkCommunicateCallbacks(action, src, dst, size, rate);
 459   return action;
 460 }
 461
 462 void NetworkCm02Model::addTraces(){
 463   xbt_dict_cursor_t cursor = NULL;
 464   char *trace_name, *elm;
 465
 466   static int called = 0;
 467   if (called)
 468     return;
 469   called = 1;
 470
 471   /* connect all traces relative to network */
 472   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 473     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
 474     NetworkCm02Link *link = static_cast<NetworkCm02Link*>( Link::byName(elm) );
 475
 476     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 477                trace_name, elm);
 478     xbt_assert(trace,
 479                "Cannot connect trace %s to link %s: trace undefined",
 480                trace_name, elm);
 481
 482     link->p_stateEvent = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 483   }
 484
 485   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 486     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
 487     NetworkCm02Link *link = static_cast<NetworkCm02Link*>( Link::byName(elm) );
 488
 489     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 490                trace_name, elm);
 491     xbt_assert(trace,
 492                "Cannot connect trace %s to link %s: trace undefined",
 493                trace_name, elm);
 494
 495     link->p_speed.event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 496   }
 497
 498   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 499     tmgr_trace_t trace = (tmgr_trace_t) xbt_dict_get_or_null(traces_set_list, trace_name);
 500     NetworkCm02Link *link = static_cast<NetworkCm02Link*>(Link::byName(elm));;
 501
 502     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 503                trace_name, elm);
 504     xbt_assert(trace,
 505                "Cannot connect trace %s to link %s: trace undefined",
 506                trace_name, elm);
 507
 508     link->p_latEvent = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 509   }
 510 }
 511
 512 /************
 513  * Resource *
 514  ************/
 515 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model *model, const char *name, xbt_dict_t props,
 516                                    lmm_system_t system,
 517                                    double constraint_value,
 518                                    tmgr_fes_t history,
 519                                    int initiallyOn,
 520                                    tmgr_trace_t state_trace,
 521                                    double metric_peak,
 522                                    tmgr_trace_t metric_trace,
 523                                    double lat_initial,
 524                                    tmgr_trace_t lat_trace,
 525                                    e_surf_link_sharing_policy_t policy)
 526 : Link(model, name, props, lmm_constraint_new(system, this, constraint_value), history, state_trace)
 527 {
 528   if (initiallyOn)
 529     turnOn();
 530   else
 531     turnOff();
 532
 533   p_speed.scale = 1.0;
 534   p_speed.peak = metric_peak;
 535   if (metric_trace)
 536     p_speed.event = tmgr_history_add_trace(history, metric_trace, 0.0, 0, this);
 537   else
 538     p_speed.event = NULL;
 539
 540   m_latCurrent = lat_initial;
 541   if (lat_trace)
 542         p_latEvent = tmgr_history_add_trace(history, lat_trace, 0.0, 0, this);
 543
 544   if (policy == SURF_LINK_FATPIPE)
 545         lmm_constraint_shared(getConstraint());
 546 }
 547
 548
 549
 550 void NetworkCm02Link::updateState(tmgr_trace_iterator_t triggered,
 551                                       double value, double date)
 552 {
 553
 554   /* Find out which of my iterators was triggered, and react accordingly */
 555   if (triggered == p_speed.event) {
 556     updateBandwidth(value, date);
 557     if (tmgr_trace_event_free(triggered))
 558       p_speed.event = NULL;
 559   } else if (triggered == p_latEvent) {
 560     updateLatency(value, date);
 561     if (tmgr_trace_event_free(triggered))
 562       p_latEvent = NULL;
 563   } else if (triggered == p_stateEvent) {
 564     if (value > 0)
 565       turnOn();
 566     else {
 567       lmm_constraint_t cnst = getConstraint();
 568       lmm_variable_t var = NULL;
 569       lmm_element_t elem = NULL;
 570
 571       turnOff();
 572       while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), cnst, &elem))) {
 573         Action *action = static_cast<Action*>( lmm_variable_id(var) );
 574
 575         if (action->getState() == SURF_ACTION_RUNNING ||
 576             action->getState() == SURF_ACTION_READY) {
 577           action->setFinishTime(date);
 578           action->setState(SURF_ACTION_FAILED);
 579         }
 580       }
 581     }
 582     if (tmgr_trace_event_free(triggered))
 583       p_stateEvent = NULL;
 584   } else {
 585     XBT_CRITICAL("Unknown event ! \n");
 586     xbt_abort();
 587   }
 588
 589   XBT_DEBUG
 590       ("There were a resource state event, need to update actions related to the constraint (%p)",
 591        getConstraint());
 592   return;
 593 }
 594
 595 void NetworkCm02Link::updateBandwidth(double value, double date){
 596   double delta = sg_weight_S_parameter / value - sg_weight_S_parameter /
 597                  (p_speed.peak * p_speed.scale);
 598   lmm_variable_t var = NULL;
 599   lmm_element_t elem = NULL;
 600   lmm_element_t nextelem = NULL;
 601   int numelem = 0;
 602
 603   NetworkCm02Action *action = NULL;
 604
 605   p_speed.peak = value;
 606   lmm_update_constraint_bound(getModel()->getMaxminSystem(),
 607                               getConstraint(),
 608                               sg_bandwidth_factor *
 609                               (p_speed.peak * p_speed.scale));
 610   TRACE_surf_link_set_bandwidth(date, getName(), sg_bandwidth_factor * p_speed.peak * p_speed.scale);
 611   if (sg_weight_S_parameter > 0) {
 612     while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 613       action = (NetworkCm02Action*) lmm_variable_id(var);
 614       action->m_weight += delta;
 615       if (!action->isSuspended())
 616         lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 617     }
 618   }
 619 }
 620
 621 void NetworkCm02Link::updateLatency(double value, double date){
 622   double delta = value - m_latCurrent;
 623   lmm_variable_t var = NULL;
 624   lmm_element_t elem = NULL;
 625   lmm_element_t nextelem = NULL;
 626   int numelem = 0;
 627   NetworkCm02Action *action = NULL;
 628
 629   m_latCurrent = value;
 630   while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 631     action = (NetworkCm02Action*) lmm_variable_id(var);
 632     action->m_latCurrent += delta;
 633     action->m_weight += delta;
 634     if (action->m_rate < 0)
 635       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(), sg_tcp_gamma / (2.0 * action->m_latCurrent));
 636     else {
 637       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(),
 638                                 std::min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)));
 639
 640       if (action->m_rate < sg_tcp_gamma / (2.0 * action->m_latCurrent)) {
 641         XBT_INFO("Flow is limited BYBANDWIDTH");
 642       } else {
 643         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 644                  action->m_latCurrent);
 645       }
 646     }
 647     if (!action->isSuspended())
 648       lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 649   }
 650 }
 651
 652 /**********
 653  * Action *
 654  **********/
 655 void NetworkCm02Action::updateRemainingLazy(double now)
 656 {
 657   double delta = 0.0;
 658
 659   if (m_suspended != 0)
 660     return;
 661
 662   delta = now - m_lastUpdate;
 663
 664   if (m_remains > 0) {
 665     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
 666     double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
 667
 668     XBT_DEBUG("Updating action(%p): remains is now %f", this, m_remains);
 669   }
 670
 671   if (m_maxDuration != NO_MAX_DURATION)
 672     double_update(&m_maxDuration, delta, sg_surf_precision);
 673
 674   if (m_remains <= 0 &&
 675       (lmm_get_variable_weight(getVariable()) > 0)) {
 676     finish();
 677     setState(SURF_ACTION_DONE);
 678
 679     heapRemove(getModel()->getActionHeap());
 680   } else if (((m_maxDuration != NO_MAX_DURATION)
 681       && (m_maxDuration <= 0))) {
 682     finish();
 683     setState(SURF_ACTION_DONE);
 684     heapRemove(getModel()->getActionHeap());
 685   }
 686
 687   m_lastUpdate = now;
 688   m_lastValue = lmm_variable_getvalue(getVariable());
 689 }
 690
 691 }
 692 }