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 }
  33
  34 /*********
  35  * Model *
  36  *********/
  37
  38 /************************************************************************/
  39 /* New model based on optimizations discussed during Pedro Velho's thesis*/
  40 /************************************************************************/
  41 /* @techreport{VELHO:2011:HAL-00646896:1, */
  42 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
  43 /*      title = {{Flow-level network models: have we reached the limits?}}, */
  44 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
  45 /*      type = {Rapport de recherche}, */
  46 /*      institution = {INRIA}, */
  47 /*      number = {RR-7821}, */
  48 /*      year = {2011}, */
  49 /*      month = Nov, */
  50 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
  51 /*  } */
  52 void surf_network_model_init_LegrandVelho(void)
  53 {
  54   if (surf_network_model)
  55     return;
  56
  57   surf_network_model = new simgrid::surf::NetworkCm02Model();
  58   net_define_callbacks();
  59   simgrid::surf::Model *model = surf_network_model;
  60   xbt_dynar_push(all_existing_models, &model);
  61
  62   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",
  63                             13.01);
  64   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
  65                             0.97);
  66   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 20537);
  67 }
  68
  69 /***************************************************************************/
  70 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
  71 /***************************************************************************/
  72 /* @TechReport{      rr-lip2002-40, */
  73 /*   author        = {Henri Casanova and Loris Marchal}, */
  74 /*   institution   = {LIP}, */
  75 /*   title         = {A Network Model for Simulation of Grid Application}, */
  76 /*   number        = {2002-40}, */
  77 /*   month         = {oct}, */
  78 /*   year          = {2002} */
  79 /* } */
  80 void surf_network_model_init_CM02(void)
  81 {
  82
  83   if (surf_network_model)
  84     return;
  85
  86   surf_network_model = new simgrid::surf::NetworkCm02Model();
  87   xbt_dynar_push(all_existing_models, &surf_network_model);
  88   net_define_callbacks();
  89
  90   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 1.0);
  91   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 1.0);
  92   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 0.0);
  93 }
  94
  95 /***************************************************************************/
  96 /* The models from Steven H. Low                                           */
  97 /***************************************************************************/
  98 /* @article{Low03,                                                         */
  99 /*   author={Steven H. Low},                                               */
 100 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
 101 /*   year={2003},                                                          */
 102 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
 103 /*    volume={11}, number={4},                                             */
 104 /*  }                                                                      */
 105 void surf_network_model_init_Reno(void)
 106 {
 107   if (surf_network_model)
 108     return;
 109
 110   surf_network_model = new simgrid::surf::NetworkCm02Model();
 111   xbt_dynar_push(all_existing_models, &surf_network_model);
 112   net_define_callbacks();
 113   lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
 114   surf_network_model->f_networkSolve = lagrange_solve;
 115
 116   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 117   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
 118   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 119 }
 120
 121
 122 void surf_network_model_init_Reno2(void)
 123 {
 124   if (surf_network_model)
 125     return;
 126
 127   surf_network_model = new simgrid::surf::NetworkCm02Model();
 128   xbt_dynar_push(all_existing_models, &surf_network_model);
 129   net_define_callbacks();
 130   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp, func_reno2_fpi);
 131   surf_network_model->f_networkSolve = lagrange_solve;
 132
 133   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 134   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
 135   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 136 }
 137
 138 void surf_network_model_init_Vegas(void)
 139 {
 140   if (surf_network_model)
 141     return;
 142
 143   surf_network_model = new simgrid::surf::NetworkCm02Model();
 144   xbt_dynar_push(all_existing_models, &surf_network_model);
 145   net_define_callbacks();
 146   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp, func_vegas_fpi);
 147   surf_network_model->f_networkSolve = lagrange_solve;
 148
 149   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 150   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 0.92);
 151   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 152 }
 153
 154 namespace simgrid {
 155 namespace surf {
 156
 157 NetworkCm02Model::NetworkCm02Model()
 158   :NetworkModel()
 159 {
 160   char *optim = xbt_cfg_get_string(_sg_cfg_set, "network/optim");
 161   int select =
 162       xbt_cfg_get_boolean(_sg_cfg_set, "network/maxmin_selective_update");
 163
 164   if (!strcmp(optim, "Full")) {
 165     p_updateMechanism = UM_FULL;
 166     m_selectiveUpdate = select;
 167   } else if (!strcmp(optim, "Lazy")) {
 168     p_updateMechanism = UM_LAZY;
 169     m_selectiveUpdate = 1;
 170     xbt_assert((select == 1) || (xbt_cfg_is_default_value(_sg_cfg_set, "network/maxmin_selective_update")),
 171                "Disabling selective update while using the lazy update mechanism is dumb!");
 172   } else {
 173     xbt_die("Unsupported optimization (%s) for this model", optim);
 174   }
 175
 176   if (!p_maxminSystem)
 177   p_maxminSystem = lmm_system_new(m_selectiveUpdate);
 178
 179   routing_model_create(createLink("__loopback__",
 180                                 498000000, NULL, 0.000015, NULL,
 181                                 1 /*SURF_RESOURCE_ON*/, NULL,
 182                                 SURF_LINK_FATPIPE, NULL));
 183
 184   if (p_updateMechanism == UM_LAZY) {
 185   p_actionHeap = xbt_heap_new(8, NULL);
 186   xbt_heap_set_update_callback(p_actionHeap, surf_action_lmm_update_index_heap);
 187   p_modifiedSet = new ActionLmmList();
 188   p_maxminSystem->keep_track = p_modifiedSet;
 189   }
 190 }
 191
 192 Link* NetworkCm02Model::createLink(const char *name,
 193                                  double bw_initial,
 194                                  tmgr_trace_t bw_trace,
 195                                  double lat_initial,
 196                                  tmgr_trace_t lat_trace,
 197                                  int initiallyOn,
 198                                  tmgr_trace_t state_trace,
 199                                  e_surf_link_sharing_policy_t policy,
 200                                  xbt_dict_t properties)
 201 {
 202   xbt_assert(NULL == Link::byName(name),
 203              "Link '%s' declared several times in the platform",
 204              name);
 205
 206   Link* link = new NetworkCm02Link(this, name, properties, p_maxminSystem, sg_bandwidth_factor * bw_initial,
 207                      initiallyOn, state_trace, bw_initial, bw_trace, lat_initial, lat_trace, policy);
 208   Link::onCreation(link);
 209   return link;
 210 }
 211
 212 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
 213 {
 214   NetworkCm02Action *action;
 215   while ((xbt_heap_size(p_actionHeap) > 0)
 216          && (double_equals(xbt_heap_maxkey(p_actionHeap), now, sg_surf_precision))) {
 217     action = static_cast<NetworkCm02Action*> (xbt_heap_pop(p_actionHeap));
 218     XBT_DEBUG("Something happened to action %p", action);
 219     if (TRACE_is_enabled()) {
 220       int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 221       int i;
 222       for (i = 0; i < n; i++){
 223         lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 224                                                             action->getVariable(),
 225                                                             i);
 226         NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 227         TRACE_surf_link_set_utilization(link->getName(),
 228                                         action->getCategory(),
 229                                         (lmm_variable_getvalue(action->getVariable())*
 230                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 231                                                 action->getVariable(),
 232                                                 i)),
 233                                         action->getLastUpdate(),
 234                                         now - action->getLastUpdate());
 235       }
 236     }
 237
 238     // if I am wearing a latency hat
 239     if (action->getHat() == LATENCY) {
 240       XBT_DEBUG("Latency paid for action %p. Activating", action);
 241       lmm_update_variable_weight(p_maxminSystem, action->getVariable(), action->m_weight);
 242       action->heapRemove(p_actionHeap);
 243       action->refreshLastUpdate();
 244
 245         // if I am wearing a max_duration or normal hat
 246     } else if (action->getHat() == MAX_DURATION ||
 247         action->getHat() == NORMAL) {
 248         // no need to communicate anymore
 249         // assume that flows that reached max_duration have remaining of 0
 250       XBT_DEBUG("Action %p finished", action);
 251       action->setRemains(0);
 252       action->finish();
 253       action->setState(SURF_ACTION_DONE);
 254       action->heapRemove(p_actionHeap);
 255
 256       action->gapRemove();
 257     }
 258   }
 259   return;
 260 }
 261
 262
 263 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
 264 {
 265   NetworkCm02Action *action;
 266   ActionList *running_actions = getRunningActionSet();
 267
 268   for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
 269      ; it != itend ; it=itNext) {
 270   ++itNext;
 271
 272     action = static_cast<NetworkCm02Action*> (&*it);
 273     XBT_DEBUG("Something happened to action %p", action);
 274       double deltap = delta;
 275       if (action->m_latency > 0) {
 276         if (action->m_latency > deltap) {
 277           double_update(&(action->m_latency), deltap, sg_surf_precision);
 278           deltap = 0.0;
 279         } else {
 280           double_update(&(deltap), action->m_latency, sg_surf_precision);
 281           action->m_latency = 0.0;
 282         }
 283         if (action->m_latency == 0.0 && !(action->isSuspended()))
 284           lmm_update_variable_weight(p_maxminSystem, action->getVariable(),
 285               action->m_weight);
 286       }
 287       if (TRACE_is_enabled()) {
 288         int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 289         int i;
 290         for (i = 0; i < n; i++){
 291           lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 292                                                             action->getVariable(),
 293                                                             i);
 294           NetworkCm02Link* link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 295           TRACE_surf_link_set_utilization(link->getName(),
 296                                         action->getCategory(),
 297                                         (lmm_variable_getvalue(action->getVariable())*
 298                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 299                                                 action->getVariable(),
 300                                                 i)),
 301                                         action->getLastUpdate(),
 302                                         now - action->getLastUpdate());
 303         }
 304       }
 305       if (!lmm_get_number_of_cnst_from_var
 306           (p_maxminSystem, action->getVariable())) {
 307         /* There is actually no link used, hence an infinite bandwidth.
 308          * This happens often when using models like vivaldi.
 309          * In such case, just make sure that the action completes immediately.
 310          */
 311         action->updateRemains(action->getRemains());
 312       }
 313     action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
 314
 315     if (action->getMaxDuration() != NO_MAX_DURATION)
 316       action->updateMaxDuration(delta);
 317
 318     if ((action->getRemains() <= 0) &&
 319         (lmm_get_variable_weight(action->getVariable()) > 0)) {
 320       action->finish();
 321       action->setState(SURF_ACTION_DONE);
 322       action->gapRemove();
 323     } else if (((action->getMaxDuration() != NO_MAX_DURATION)
 324         && (action->getMaxDuration() <= 0))) {
 325       action->finish();
 326       action->setState(SURF_ACTION_DONE);
 327       action->gapRemove();
 328     }
 329   }
 330   return;
 331 }
 332
 333 Action *NetworkCm02Model::communicate(NetCard *src, NetCard *dst,
 334                                                 double size, double rate)
 335 {
 336   unsigned int i;
 337   void *_link;
 338   NetworkCm02Link *link;
 339   int failed = 0;
 340   NetworkCm02Action *action = NULL;
 341   double bandwidth_bound;
 342   double latency = 0.0;
 343   xbt_dynar_t back_route = NULL;
 344   int constraints_per_variable = 0;
 345
 346   xbt_dynar_t route = xbt_dynar_new(sizeof(NetCard*), NULL);
 347
 348   XBT_IN("(%s,%s,%g,%g)", src->getName(), dst->getName(), size, rate);
 349
 350   routing_platf->getRouteAndLatency(src, dst, &route, &latency);
 351   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 352              "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
 353              src->getName(), dst->getName());
 354
 355   xbt_dynar_foreach(route, i, _link) {
 356   link = static_cast<NetworkCm02Link*>(_link);
 357     if (link->isOff()) {
 358       failed = 1;
 359       break;
 360     }
 361   }
 362   if (sg_network_crosstraffic == 1) {
 363     routing_platf->getRouteAndLatency(dst, src, &back_route, NULL);
 364     xbt_dynar_foreach(back_route, i, _link) {
 365       link = static_cast<NetworkCm02Link*>(_link);
 366       if (link->isOff()) {
 367         failed = 1;
 368         break;
 369       }
 370     }
 371   }
 372
 373   action = new NetworkCm02Action(this, size, failed);
 374
 375 #ifdef HAVE_LATENCY_BOUND_TRACKING
 376   action->m_latencyLimited = 0;
 377 #endif
 378   action->m_weight = action->m_latency = latency;
 379
 380   action->m_rate = rate;
 381   if (p_updateMechanism == UM_LAZY) {
 382     action->m_indexHeap = -1;
 383     action->m_lastUpdate = surf_get_clock();
 384   }
 385
 386   bandwidth_bound = -1.0;
 387   if (sg_weight_S_parameter > 0) {
 388     xbt_dynar_foreach(route, i, _link) {
 389       link = static_cast<NetworkCm02Link*>(_link);
 390       action->m_weight += sg_weight_S_parameter / link->getBandwidth();
 391     }
 392   }
 393   xbt_dynar_foreach(route, i, _link) {
 394   link = static_cast<NetworkCm02Link*>(_link);
 395     double bb = bandwidthFactor(size) * link->getBandwidth();
 396     bandwidth_bound =
 397         (bandwidth_bound < 0.0) ? bb : std::min(bandwidth_bound, bb);
 398   }
 399
 400   action->m_latCurrent = action->m_latency;
 401   action->m_latency *= latencyFactor(size);
 402   action->m_rate = bandwidthConstraint(action->m_rate, bandwidth_bound, size);
 403   if (m_haveGap) {
 404     xbt_assert(!xbt_dynar_is_empty(route),
 405                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 406
 407     link = *static_cast<NetworkCm02Link **>(xbt_dynar_get_ptr(route, 0));
 408     gapAppend(size, link, action);
 409     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 410               action, src->getName(), dst->getName(), action->m_senderGap,
 411               action->m_latency);
 412   }
 413
 414   constraints_per_variable = xbt_dynar_length(route);
 415   if (back_route != NULL)
 416     constraints_per_variable += xbt_dynar_length(back_route);
 417
 418   if (action->m_latency > 0) {
 419     action->p_variable = lmm_variable_new(p_maxminSystem, action, 0.0, -1.0,
 420                          constraints_per_variable);
 421     if (p_updateMechanism == UM_LAZY) {
 422       // add to the heap the event when the latency is payed
 423       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 424                 action->m_latency + action->m_lastUpdate);
 425       action->heapInsert(p_actionHeap, action->m_latency + action->m_lastUpdate, xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 426     }
 427   } else
 428     action->p_variable = lmm_variable_new(p_maxminSystem, action, 1.0, -1.0, constraints_per_variable);
 429
 430   if (action->m_rate < 0) {
 431     lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? sg_tcp_gamma / (2.0 * action->m_latCurrent) : -1.0);
 432   } else {
 433     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);
 434   }
 435
 436   xbt_dynar_foreach(route, i, _link) {
 437   link = static_cast<NetworkCm02Link*>(_link);
 438     lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), 1.0);
 439   }
 440
 441   if (sg_network_crosstraffic == 1) {
 442     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 443     xbt_dynar_foreach(back_route, i, _link) {
 444       link = static_cast<NetworkCm02Link*>(_link);
 445       lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), .05);
 446     }
 447     lmm_variable_concurrency_share_set(action->getVariable(),2);
 448   }
 449
 450   xbt_dynar_free(&route);
 451   XBT_OUT();
 452
 453   networkCommunicateCallbacks(action, src, dst, size, rate);
 454   return action;
 455 }
 456
 457 /************
 458  * Resource *
 459  ************/
 460 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model *model, const char *name, xbt_dict_t props,
 461                              lmm_system_t system,
 462                              double constraint_value,
 463                              int initiallyOn, tmgr_trace_t state_trace,
 464                              double bw_peak, tmgr_trace_t bw_trace,
 465                              double lat_initial, tmgr_trace_t lat_trace,
 466                              e_surf_link_sharing_policy_t policy)
 467 : Link(model, name, props, lmm_constraint_new(system, this, constraint_value), state_trace)
 468 {
 469   if (initiallyOn)
 470     turnOn();
 471   else
 472     turnOff();
 473
 474   m_bandwidth.scale = 1.0;
 475   m_bandwidth.peak = bw_peak;
 476   if (bw_trace)
 477     m_bandwidth.event = future_evt_set->add_trace(bw_trace, 0.0, this);
 478   else
 479     m_bandwidth.event = NULL;
 480
 481   m_latency.scale = 1.0;
 482   m_latency.peak = lat_initial;
 483   if (lat_trace)
 484     m_latency.event = future_evt_set->add_trace(lat_trace, 0.0, this);
 485
 486   if (policy == SURF_LINK_FATPIPE)
 487   lmm_constraint_shared(getConstraint());
 488 }
 489
 490
 491
 492 void NetworkCm02Link::apply_event(tmgr_trace_iterator_t triggered, double value)
 493 {
 494
 495   /* Find out which of my iterators was triggered, and react accordingly */
 496   if (triggered == m_bandwidth.event) {
 497     updateBandwidth(value);
 498     tmgr_trace_event_unref(&m_bandwidth.event);
 499
 500   } else if (triggered == m_latency.event) {
 501     updateLatency(value);
 502     tmgr_trace_event_unref(&m_latency.event);
 503
 504   } else if (triggered == m_stateEvent) {
 505     if (value > 0)
 506       turnOn();
 507     else {
 508       lmm_variable_t var = NULL;
 509       lmm_element_t elem = NULL;
 510       double now = surf_get_clock();
 511
 512       turnOff();
 513       while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), getConstraint(), &elem))) {
 514         Action *action = static_cast<Action*>( lmm_variable_id(var) );
 515
 516         if (action->getState() == SURF_ACTION_RUNNING ||
 517             action->getState() == SURF_ACTION_READY) {
 518           action->setFinishTime(now);
 519           action->setState(SURF_ACTION_FAILED);
 520         }
 521       }
 522     }
 523     tmgr_trace_event_unref(&m_stateEvent);
 524   } else {
 525     xbt_die("Unknown event!\n");
 526   }
 527
 528   XBT_DEBUG
 529       ("There was a resource state event, need to update actions related to the constraint (%p)",
 530        getConstraint());
 531 }
 532
 533 void NetworkCm02Link::updateBandwidth(double value) {
 534   double delta = sg_weight_S_parameter / value - sg_weight_S_parameter /
 535                  (m_bandwidth.peak * m_bandwidth.scale);
 536   lmm_variable_t var = NULL;
 537   lmm_element_t elem = NULL;
 538   lmm_element_t nextelem = NULL;
 539   int numelem = 0;
 540
 541   NetworkCm02Action *action = NULL;
 542
 543   m_bandwidth.peak = value;
 544   lmm_update_constraint_bound(getModel()->getMaxminSystem(),
 545                               getConstraint(),
 546                               sg_bandwidth_factor *
 547                               (m_bandwidth.peak * m_bandwidth.scale));
 548   TRACE_surf_link_set_bandwidth(surf_get_clock(), getName(), sg_bandwidth_factor * m_bandwidth.peak * m_bandwidth.scale);
 549   if (sg_weight_S_parameter > 0) {
 550     while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 551       action = (NetworkCm02Action*) lmm_variable_id(var);
 552       action->m_weight += delta;
 553       if (!action->isSuspended())
 554         lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 555     }
 556   }
 557 }
 558
 559 void NetworkCm02Link::updateLatency(double value){
 560   double delta = value - m_latency.peak;
 561   lmm_variable_t var = NULL;
 562   lmm_element_t elem = NULL;
 563   lmm_element_t nextelem = NULL;
 564   int numelem = 0;
 565   NetworkCm02Action *action = NULL;
 566
 567   m_latency.peak = value;
 568   while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 569     action = (NetworkCm02Action*) lmm_variable_id(var);
 570     action->m_latCurrent += delta;
 571     action->m_weight += delta;
 572     if (action->m_rate < 0)
 573       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(), sg_tcp_gamma / (2.0 * action->m_latCurrent));
 574     else {
 575       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(),
 576                                 std::min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)));
 577
 578       if (action->m_rate < sg_tcp_gamma / (2.0 * action->m_latCurrent)) {
 579         XBT_INFO("Flow is limited BYBANDWIDTH");
 580       } else {
 581         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 582                  action->m_latCurrent);
 583       }
 584     }
 585     if (!action->isSuspended())
 586       lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 587   }
 588 }
 589
 590 /**********
 591  * Action *
 592  **********/
 593 void NetworkCm02Action::updateRemainingLazy(double now)
 594 {
 595   double delta = 0.0;
 596
 597   if (m_suspended != 0)
 598     return;
 599
 600   delta = now - m_lastUpdate;
 601
 602   if (m_remains > 0) {
 603     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
 604     double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
 605
 606     XBT_DEBUG("Updating action(%p): remains is now %f", this, m_remains);
 607   }
 608
 609   if (m_maxDuration != NO_MAX_DURATION)
 610     double_update(&m_maxDuration, delta, sg_surf_precision);
 611
 612   if (m_remains <= 0 &&
 613       (lmm_get_variable_weight(getVariable()) > 0)) {
 614     finish();
 615     setState(SURF_ACTION_DONE);
 616
 617     heapRemove(getModel()->getActionHeap());
 618   } else if (((m_maxDuration != NO_MAX_DURATION)
 619       && (m_maxDuration <= 0))) {
 620     finish();
 621     setState(SURF_ACTION_DONE);
 622     heapRemove(getModel()->getActionHeap());
 623   }
 624
 625   m_lastUpdate = now;
 626   m_lastValue = lmm_variable_getvalue(getVariable());
 627 }
 628
 629 }
 630 }