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
  13 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
  14
  15 double sg_sender_gap = 0.0;
  16 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
  17 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
  18 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
  19
  20 double sg_tcp_gamma = 0.0;
  21 int sg_network_crosstraffic = 0;
  22
  23 /*************
  24  * CallBacks *
  25  *************/
  26
  27 void net_define_callbacks(void)
  28 {
  29   /* Figuring out the network links */
  30   simgrid::surf::on_link.connect(netlink_parse_init);
  31 }
  32
  33 /*********
  34  * Model *
  35  *********/
  36
  37 /************************************************************************/
  38 /* New model based on optimizations discussed during Pedro Velho's thesis*/
  39 /************************************************************************/
  40 /* @techreport{VELHO:2011:HAL-00646896:1, */
  41 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
  42 /*      title = {{Flow-level network models: have we reached the limits?}}, */
  43 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
  44 /*      type = {Rapport de recherche}, */
  45 /*      institution = {INRIA}, */
  46 /*      number = {RR-7821}, */
  47 /*      year = {2011}, */
  48 /*      month = Nov, */
  49 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
  50 /*  } */
  51 void surf_network_model_init_LegrandVelho(void)
  52 {
  53   if (surf_network_model)
  54     return;
  55
  56   surf_network_model = new simgrid::surf::NetworkCm02Model();
  57   net_define_callbacks();
  58   simgrid::surf::Model *model = surf_network_model;
  59   xbt_dynar_push(all_existing_models, &model);
  60
  61   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",
  62                             13.01);
  63   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
  64                             0.97);
  65   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 20537);
  66 }
  67
  68 /***************************************************************************/
  69 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
  70 /***************************************************************************/
  71 /* @TechReport{      rr-lip2002-40, */
  72 /*   author        = {Henri Casanova and Loris Marchal}, */
  73 /*   institution   = {LIP}, */
  74 /*   title         = {A Network Model for Simulation of Grid Application}, */
  75 /*   number        = {2002-40}, */
  76 /*   month         = {oct}, */
  77 /*   year          = {2002} */
  78 /* } */
  79 void surf_network_model_init_CM02(void)
  80 {
  81
  82   if (surf_network_model)
  83     return;
  84
  85   surf_network_model = new simgrid::surf::NetworkCm02Model();
  86   xbt_dynar_push(all_existing_models, &surf_network_model);
  87   net_define_callbacks();
  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", 1.0);
  91   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 0.0);
  92 }
  93
  94 /***************************************************************************/
  95 /* The models from Steven H. Low                                           */
  96 /***************************************************************************/
  97 /* @article{Low03,                                                         */
  98 /*   author={Steven H. Low},                                               */
  99 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
 100 /*   year={2003},                                                          */
 101 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
 102 /*    volume={11}, number={4},                                             */
 103 /*  }                                                                      */
 104 void surf_network_model_init_Reno(void)
 105 {
 106   if (surf_network_model)
 107     return;
 108
 109   surf_network_model = new simgrid::surf::NetworkCm02Model();
 110   xbt_dynar_push(all_existing_models, &surf_network_model);
 111   net_define_callbacks();
 112   lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
 113   surf_network_model->f_networkSolve = lagrange_solve;
 114
 115   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 116   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
 117   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 118 }
 119
 120
 121 void surf_network_model_init_Reno2(void)
 122 {
 123   if (surf_network_model)
 124     return;
 125
 126   surf_network_model = new simgrid::surf::NetworkCm02Model();
 127   xbt_dynar_push(all_existing_models, &surf_network_model);
 128   net_define_callbacks();
 129   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp, func_reno2_fpi);
 130   surf_network_model->f_networkSolve = lagrange_solve;
 131
 132   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 133   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
 134   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 135 }
 136
 137 void surf_network_model_init_Vegas(void)
 138 {
 139   if (surf_network_model)
 140     return;
 141
 142   surf_network_model = new simgrid::surf::NetworkCm02Model();
 143   xbt_dynar_push(all_existing_models, &surf_network_model);
 144   net_define_callbacks();
 145   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp, func_vegas_fpi);
 146   surf_network_model->f_networkSolve = lagrange_solve;
 147
 148   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 149   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
 150   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 151 }
 152
 153 namespace simgrid {
 154 namespace surf {
 155
 156 NetworkCm02Model::NetworkCm02Model()
 157   :NetworkModel()
 158 {
 159   char *optim = xbt_cfg_get_string(_sg_cfg_set, "network/optim");
 160   int select = xbt_cfg_get_boolean(_sg_cfg_set, "network/maxmin_selective_update");
 161
 162   if (!strcmp(optim, "Full")) {
 163     p_updateMechanism = UM_FULL;
 164     m_selectiveUpdate = select;
 165   } else if (!strcmp(optim, "Lazy")) {
 166     p_updateMechanism = UM_LAZY;
 167     m_selectiveUpdate = 1;
 168     xbt_assert((select == 1) || (xbt_cfg_is_default_value(_sg_cfg_set, "network/maxmin_selective_update")),
 169                "Disabling selective update while using the lazy update mechanism is dumb!");
 170   } else {
 171     xbt_die("Unsupported optimization (%s) for this model", optim);
 172   }
 173
 174   if (!p_maxminSystem)
 175     p_maxminSystem = lmm_system_new(m_selectiveUpdate);
 176
 177   routing_model_create(createLink("__loopback__",
 178                                 498000000, NULL, 0.000015, NULL,
 179                                 1 /*SURF_RESOURCE_ON*/, NULL,
 180                                 SURF_LINK_FATPIPE, NULL));
 181
 182   if (p_updateMechanism == UM_LAZY) {
 183   p_actionHeap = xbt_heap_new(8, NULL);
 184   xbt_heap_set_update_callback(p_actionHeap, surf_action_lmm_update_index_heap);
 185   p_modifiedSet = new ActionLmmList();
 186   p_maxminSystem->keep_track = p_modifiedSet;
 187   }
 188 }
 189
 190 Link* NetworkCm02Model::createLink(const char *name,
 191                                  double bw_initial,
 192                                  tmgr_trace_t bw_trace,
 193                                  double lat_initial,
 194                                  tmgr_trace_t lat_trace,
 195                                  int initiallyOn,
 196                                  tmgr_trace_t state_trace,
 197                                  e_surf_link_sharing_policy_t policy,
 198                                  xbt_dict_t properties)
 199 {
 200   xbt_assert(NULL == Link::byName(name),
 201              "Link '%s' declared several times in the platform",
 202              name);
 203
 204   Link* link = new NetworkCm02Link(this, name, properties, p_maxminSystem, sg_bandwidth_factor * bw_initial,
 205                      initiallyOn, state_trace, bw_initial, bw_trace, lat_initial, lat_trace, policy);
 206   Link::onCreation(link);
 207   return link;
 208 }
 209
 210 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
 211 {
 212   NetworkCm02Action *action;
 213   while ((xbt_heap_size(p_actionHeap) > 0)
 214          && (double_equals(xbt_heap_maxkey(p_actionHeap), now, sg_surf_precision))) {
 215     action = static_cast<NetworkCm02Action*> (xbt_heap_pop(p_actionHeap));
 216     XBT_DEBUG("Something happened to action %p", action);
 217     if (TRACE_is_enabled()) {
 218       int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 219       int i;
 220       for (i = 0; i < n; i++){
 221         lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 222                                                             action->getVariable(),
 223                                                             i);
 224         NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 225         TRACE_surf_link_set_utilization(link->getName(),
 226                                         action->getCategory(),
 227                                         (lmm_variable_getvalue(action->getVariable())*
 228                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 229                                                 action->getVariable(),
 230                                                 i)),
 231                                         action->getLastUpdate(),
 232                                         now - action->getLastUpdate());
 233       }
 234     }
 235
 236     // if I am wearing a latency hat
 237     if (action->getHat() == LATENCY) {
 238       XBT_DEBUG("Latency paid for action %p. Activating", action);
 239       lmm_update_variable_weight(p_maxminSystem, action->getVariable(), action->m_weight);
 240       action->heapRemove(p_actionHeap);
 241       action->refreshLastUpdate();
 242
 243         // if I am wearing a max_duration or normal hat
 244     } else if (action->getHat() == MAX_DURATION ||
 245         action->getHat() == NORMAL) {
 246         // no need to communicate anymore
 247         // assume that flows that reached max_duration have remaining of 0
 248       XBT_DEBUG("Action %p finished", action);
 249       action->setRemains(0);
 250       action->finish();
 251       action->setState(SURF_ACTION_DONE);
 252       action->heapRemove(p_actionHeap);
 253
 254       action->gapRemove();
 255     }
 256   }
 257   return;
 258 }
 259
 260
 261 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
 262 {
 263   NetworkCm02Action *action;
 264   ActionList *running_actions = getRunningActionSet();
 265
 266   for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
 267      ; it != itend ; it=itNext) {
 268   ++itNext;
 269
 270     action = static_cast<NetworkCm02Action*> (&*it);
 271     XBT_DEBUG("Something happened to action %p", action);
 272       double deltap = delta;
 273       if (action->m_latency > 0) {
 274         if (action->m_latency > deltap) {
 275           double_update(&(action->m_latency), deltap, sg_surf_precision);
 276           deltap = 0.0;
 277         } else {
 278           double_update(&(deltap), action->m_latency, sg_surf_precision);
 279           action->m_latency = 0.0;
 280         }
 281         if (action->m_latency == 0.0 && !(action->isSuspended()))
 282           lmm_update_variable_weight(p_maxminSystem, action->getVariable(),
 283               action->m_weight);
 284       }
 285       if (TRACE_is_enabled()) {
 286         int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 287         int i;
 288         for (i = 0; i < n; i++){
 289           lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 290                                                             action->getVariable(),
 291                                                             i);
 292           NetworkCm02Link* link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 293           TRACE_surf_link_set_utilization(link->getName(),
 294                                         action->getCategory(),
 295                                         (lmm_variable_getvalue(action->getVariable())*
 296                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 297                                                 action->getVariable(),
 298                                                 i)),
 299                                         action->getLastUpdate(),
 300                                         now - action->getLastUpdate());
 301         }
 302       }
 303       if (!lmm_get_number_of_cnst_from_var
 304           (p_maxminSystem, action->getVariable())) {
 305         /* There is actually no link used, hence an infinite bandwidth.
 306          * This happens often when using models like vivaldi.
 307          * In such case, just make sure that the action completes immediately.
 308          */
 309         action->updateRemains(action->getRemains());
 310       }
 311     action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
 312
 313     if (action->getMaxDuration() != NO_MAX_DURATION)
 314       action->updateMaxDuration(delta);
 315
 316     if ((action->getRemains() <= 0) &&
 317         (lmm_get_variable_weight(action->getVariable()) > 0)) {
 318       action->finish();
 319       action->setState(SURF_ACTION_DONE);
 320       action->gapRemove();
 321     } else if (((action->getMaxDuration() != NO_MAX_DURATION)
 322         && (action->getMaxDuration() <= 0))) {
 323       action->finish();
 324       action->setState(SURF_ACTION_DONE);
 325       action->gapRemove();
 326     }
 327   }
 328   return;
 329 }
 330
 331 Action *NetworkCm02Model::communicate(NetCard *src, NetCard *dst,
 332                                                 double size, double rate)
 333 {
 334   unsigned int i;
 335   void *_link;
 336   NetworkCm02Link *link;
 337   int failed = 0;
 338   NetworkCm02Action *action = NULL;
 339   double bandwidth_bound;
 340   double latency = 0.0;
 341   xbt_dynar_t back_route = NULL;
 342   int constraints_per_variable = 0;
 343
 344   xbt_dynar_t route = xbt_dynar_new(sizeof(NetCard*), NULL);
 345
 346   XBT_IN("(%s,%s,%g,%g)", src->name(), dst->name(), size, rate);
 347
 348   routing_platf->getRouteAndLatency(src, dst, &route, &latency);
 349   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 350              "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
 351              src->name(), dst->name());
 352
 353   xbt_dynar_foreach(route, i, _link) {
 354   link = static_cast<NetworkCm02Link*>(_link);
 355     if (link->isOff()) {
 356       failed = 1;
 357       break;
 358     }
 359   }
 360   if (sg_network_crosstraffic == 1) {
 361     routing_platf->getRouteAndLatency(dst, src, &back_route, NULL);
 362     xbt_dynar_foreach(back_route, i, _link) {
 363       link = static_cast<NetworkCm02Link*>(_link);
 364       if (link->isOff()) {
 365         failed = 1;
 366         break;
 367       }
 368     }
 369   }
 370
 371   action = new NetworkCm02Action(this, size, failed);
 372
 373 #ifdef HAVE_LATENCY_BOUND_TRACKING
 374   action->m_latencyLimited = 0;
 375 #endif
 376   action->m_weight = action->m_latency = latency;
 377
 378   action->m_rate = rate;
 379   if (p_updateMechanism == UM_LAZY) {
 380     action->m_indexHeap = -1;
 381     action->m_lastUpdate = surf_get_clock();
 382   }
 383
 384   bandwidth_bound = -1.0;
 385   if (sg_weight_S_parameter > 0) {
 386     xbt_dynar_foreach(route, i, _link) {
 387       link = static_cast<NetworkCm02Link*>(_link);
 388       action->m_weight += sg_weight_S_parameter / link->getBandwidth();
 389     }
 390   }
 391   xbt_dynar_foreach(route, i, _link) {
 392   link = static_cast<NetworkCm02Link*>(_link);
 393     double bb = bandwidthFactor(size) * link->getBandwidth();
 394     bandwidth_bound =
 395         (bandwidth_bound < 0.0) ? bb : std::min(bandwidth_bound, bb);
 396   }
 397
 398   action->m_latCurrent = action->m_latency;
 399   action->m_latency *= latencyFactor(size);
 400   action->m_rate = bandwidthConstraint(action->m_rate, bandwidth_bound, size);
 401   if (m_haveGap) {
 402     xbt_assert(!xbt_dynar_is_empty(route),
 403                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 404
 405     link = *static_cast<NetworkCm02Link **>(xbt_dynar_get_ptr(route, 0));
 406     gapAppend(size, link, action);
 407     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 408               action, src->name(), dst->name(), action->m_senderGap,
 409               action->m_latency);
 410   }
 411
 412   constraints_per_variable = xbt_dynar_length(route);
 413   if (back_route != NULL)
 414     constraints_per_variable += xbt_dynar_length(back_route);
 415
 416   if (action->m_latency > 0) {
 417     action->p_variable = lmm_variable_new(p_maxminSystem, action, 0.0, -1.0,
 418                          constraints_per_variable);
 419     if (p_updateMechanism == UM_LAZY) {
 420       // add to the heap the event when the latency is payed
 421       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 422                 action->m_latency + action->m_lastUpdate);
 423       action->heapInsert(p_actionHeap, action->m_latency + action->m_lastUpdate, xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 424     }
 425   } else
 426     action->p_variable = lmm_variable_new(p_maxminSystem, action, 1.0, -1.0, constraints_per_variable);
 427
 428   if (action->m_rate < 0) {
 429     lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? sg_tcp_gamma / (2.0 * action->m_latCurrent) : -1.0);
 430   } else {
 431     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);
 432   }
 433
 434   xbt_dynar_foreach(route, i, _link) {
 435   link = static_cast<NetworkCm02Link*>(_link);
 436     lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), 1.0);
 437   }
 438
 439   if (sg_network_crosstraffic == 1) {
 440     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 441     xbt_dynar_foreach(back_route, i, _link) {
 442       link = static_cast<NetworkCm02Link*>(_link);
 443       lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), .05);
 444     }
 445     lmm_variable_concurrency_share_set(action->getVariable(),2);
 446   }
 447
 448   xbt_dynar_free(&route);
 449   XBT_OUT();
 450
 451   networkCommunicateCallbacks(action, src, dst, size, rate);
 452   return action;
 453 }
 454
 455 /************
 456  * Resource *
 457  ************/
 458 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model *model, const char *name, xbt_dict_t props,
 459                              lmm_system_t system,
 460                              double constraint_value,
 461                              int initiallyOn, tmgr_trace_t state_trace,
 462                              double bw_peak, tmgr_trace_t bw_trace,
 463                              double lat_initial, tmgr_trace_t lat_trace,
 464                              e_surf_link_sharing_policy_t policy)
 465 : Link(model, name, props, lmm_constraint_new(system, this, constraint_value), state_trace)
 466 {
 467   if (initiallyOn)
 468     turnOn();
 469   else
 470     turnOff();
 471
 472   m_bandwidth.scale = 1.0;
 473   m_bandwidth.peak = bw_peak;
 474   if (bw_trace)
 475     m_bandwidth.event = future_evt_set->add_trace(bw_trace, 0.0, this);
 476   else
 477     m_bandwidth.event = NULL;
 478
 479   m_latency.scale = 1.0;
 480   m_latency.peak = lat_initial;
 481   if (lat_trace)
 482     m_latency.event = future_evt_set->add_trace(lat_trace, 0.0, this);
 483
 484   if (policy == SURF_LINK_FATPIPE)
 485   lmm_constraint_shared(getConstraint());
 486 }
 487
 488
 489
 490 void NetworkCm02Link::apply_event(tmgr_trace_iterator_t triggered, double value)
 491 {
 492
 493   /* Find out which of my iterators was triggered, and react accordingly */
 494   if (triggered == m_bandwidth.event) {
 495     updateBandwidth(value);
 496     tmgr_trace_event_unref(&m_bandwidth.event);
 497
 498   } else if (triggered == m_latency.event) {
 499     updateLatency(value);
 500     tmgr_trace_event_unref(&m_latency.event);
 501
 502   } else if (triggered == m_stateEvent) {
 503     if (value > 0)
 504       turnOn();
 505     else {
 506       lmm_variable_t var = NULL;
 507       lmm_element_t elem = NULL;
 508       double now = surf_get_clock();
 509
 510       turnOff();
 511       while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), getConstraint(), &elem))) {
 512         Action *action = static_cast<Action*>( lmm_variable_id(var) );
 513
 514         if (action->getState() == SURF_ACTION_RUNNING ||
 515             action->getState() == SURF_ACTION_READY) {
 516           action->setFinishTime(now);
 517           action->setState(SURF_ACTION_FAILED);
 518         }
 519       }
 520     }
 521     tmgr_trace_event_unref(&m_stateEvent);
 522   } else {
 523     xbt_die("Unknown event!\n");
 524   }
 525
 526   XBT_DEBUG
 527       ("There was a resource state event, need to update actions related to the constraint (%p)",
 528        getConstraint());
 529 }
 530
 531 void NetworkCm02Link::updateBandwidth(double value) {
 532   double delta = sg_weight_S_parameter / value - sg_weight_S_parameter /
 533                  (m_bandwidth.peak * m_bandwidth.scale);
 534   lmm_variable_t var = NULL;
 535   lmm_element_t elem = NULL;
 536   lmm_element_t nextelem = NULL;
 537   int numelem = 0;
 538
 539   NetworkCm02Action *action = NULL;
 540
 541   m_bandwidth.peak = value;
 542   lmm_update_constraint_bound(getModel()->getMaxminSystem(),
 543                               getConstraint(),
 544                               sg_bandwidth_factor *
 545                               (m_bandwidth.peak * m_bandwidth.scale));
 546   TRACE_surf_link_set_bandwidth(surf_get_clock(), getName(), sg_bandwidth_factor * m_bandwidth.peak * m_bandwidth.scale);
 547   if (sg_weight_S_parameter > 0) {
 548     while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 549       action = (NetworkCm02Action*) lmm_variable_id(var);
 550       action->m_weight += delta;
 551       if (!action->isSuspended())
 552         lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 553     }
 554   }
 555 }
 556
 557 void NetworkCm02Link::updateLatency(double value){
 558   double delta = value - m_latency.peak;
 559   lmm_variable_t var = NULL;
 560   lmm_element_t elem = NULL;
 561   lmm_element_t nextelem = NULL;
 562   int numelem = 0;
 563   NetworkCm02Action *action = NULL;
 564
 565   m_latency.peak = value;
 566   while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 567     action = (NetworkCm02Action*) lmm_variable_id(var);
 568     action->m_latCurrent += delta;
 569     action->m_weight += delta;
 570     if (action->m_rate < 0)
 571       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(), sg_tcp_gamma / (2.0 * action->m_latCurrent));
 572     else {
 573       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(),
 574                                 std::min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)));
 575
 576       if (action->m_rate < sg_tcp_gamma / (2.0 * action->m_latCurrent)) {
 577         XBT_INFO("Flow is limited BYBANDWIDTH");
 578       } else {
 579         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 580                  action->m_latCurrent);
 581       }
 582     }
 583     if (!action->isSuspended())
 584       lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 585   }
 586 }
 587
 588 /**********
 589  * Action *
 590  **********/
 591 void NetworkCm02Action::updateRemainingLazy(double now)
 592 {
 593   double delta = 0.0;
 594
 595   if (m_suspended != 0)
 596     return;
 597
 598   delta = now - m_lastUpdate;
 599
 600   if (m_remains > 0) {
 601     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
 602     double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
 603
 604     XBT_DEBUG("Updating action(%p): remains is now %f", this, m_remains);
 605   }
 606
 607   if (m_maxDuration != NO_MAX_DURATION)
 608     double_update(&m_maxDuration, delta, sg_surf_precision);
 609
 610   if (m_remains <= 0 &&
 611       (lmm_get_variable_weight(getVariable()) > 0)) {
 612     finish();
 613     setState(SURF_ACTION_DONE);
 614
 615     heapRemove(getModel()->getActionHeap());
 616   } else if (((m_maxDuration != NO_MAX_DURATION)
 617       && (m_maxDuration <= 0))) {
 618     finish();
 619     setState(SURF_ACTION_DONE);
 620     heapRemove(getModel()->getActionHeap());
 621   }
 622
 623   m_lastUpdate = now;
 624   m_lastValue = lmm_variable_getvalue(getVariable());
 625 }
 626
 627 }
 628 }