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 /* New model based on optimizations discussed during Pedro Velho's thesis*/
  25 /************************************************************************/
  26 /* @techreport{VELHO:2011:HAL-00646896:1, */
  27 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
  28 /*      title = {{Flow-level network models: have we reached the limits?}}, */
  29 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
  30 /*      type = {Rapport de recherche}, */
  31 /*      institution = {INRIA}, */
  32 /*      number = {RR-7821}, */
  33 /*      year = {2011}, */
  34 /*      month = Nov, */
  35 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
  36 /*  } */
  37 void surf_network_model_init_LegrandVelho(void)
  38 {
  39   if (surf_network_model)
  40     return;
  41
  42   simgrid::surf::on_link.connect(netlink_parse_init);
  43   surf_network_model = new simgrid::surf::NetworkCm02Model();
  44   xbt_dynar_push(all_existing_models, &surf_network_model);
  45
  46   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",      13.01);
  47   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",     0.97);
  48   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S",         20537);
  49 }
  50
  51 /***************************************************************************/
  52 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
  53 /***************************************************************************/
  54 /* @TechReport{      rr-lip2002-40, */
  55 /*   author        = {Henri Casanova and Loris Marchal}, */
  56 /*   institution   = {LIP}, */
  57 /*   title         = {A Network Model for Simulation of Grid Application}, */
  58 /*   number        = {2002-40}, */
  59 /*   month         = {oct}, */
  60 /*   year          = {2002} */
  61 /* } */
  62 void surf_network_model_init_CM02(void)
  63 {
  64
  65   if (surf_network_model)
  66     return;
  67
  68   simgrid::surf::on_link.connect(netlink_parse_init);
  69   surf_network_model = new simgrid::surf::NetworkCm02Model();
  70   xbt_dynar_push(all_existing_models, &surf_network_model);
  71
  72   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",   1.0);
  73   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor", 1.0);
  74   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S",         0.0);
  75 }
  76
  77 /***************************************************************************/
  78 /* The models from Steven H. Low                                           */
  79 /***************************************************************************/
  80 /* @article{Low03,                                                         */
  81 /*   author={Steven H. Low},                                               */
  82 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
  83 /*   year={2003},                                                          */
  84 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
  85 /*    volume={11}, number={4},                                             */
  86 /*  }                                                                      */
  87 void surf_network_model_init_Reno(void)
  88 {
  89   if (surf_network_model)
  90     return;
  91
  92   simgrid::surf::on_link.connect(netlink_parse_init);
  93   surf_network_model = new simgrid::surf::NetworkCm02Model();
  94   xbt_dynar_push(all_existing_models, &surf_network_model);
  95
  96   lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
  97   surf_network_model->f_networkSolve = lagrange_solve;
  98
  99   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",     10.4);
 100   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",    0.92);
 101   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S",         8775);
 102 }
 103
 104
 105 void surf_network_model_init_Reno2(void)
 106 {
 107   if (surf_network_model)
 108     return;
 109
 110   simgrid::surf::on_link.connect(netlink_parse_init);
 111   surf_network_model = new simgrid::surf::NetworkCm02Model();
 112   xbt_dynar_push(all_existing_models, &surf_network_model);
 113
 114   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp, func_reno2_fpi);
 115   surf_network_model->f_networkSolve = lagrange_solve;
 116
 117   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",    10.4);
 118   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",   0.92);
 119   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S",        8775);
 120 }
 121
 122 void surf_network_model_init_Vegas(void)
 123 {
 124   if (surf_network_model)
 125     return;
 126
 127   simgrid::surf::on_link.connect(netlink_parse_init);
 128   surf_network_model = new simgrid::surf::NetworkCm02Model();
 129   xbt_dynar_push(all_existing_models, &surf_network_model);
 130
 131   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp, func_vegas_fpi);
 132   surf_network_model->f_networkSolve = lagrange_solve;
 133
 134   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",    10.4);
 135   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",   0.92);
 136   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S",        8775);
 137 }
 138
 139 namespace simgrid {
 140 namespace surf {
 141
 142 NetworkCm02Model::NetworkCm02Model()
 143   :NetworkModel()
 144 {
 145   char *optim = xbt_cfg_get_string(_sg_cfg_set, "network/optim");
 146   int select = xbt_cfg_get_boolean(_sg_cfg_set, "network/maxmin_selective_update");
 147
 148   if (!strcmp(optim, "Full")) {
 149     p_updateMechanism = UM_FULL;
 150     m_selectiveUpdate = select;
 151   } else if (!strcmp(optim, "Lazy")) {
 152     p_updateMechanism = UM_LAZY;
 153     m_selectiveUpdate = 1;
 154     xbt_assert((select == 1) || (xbt_cfg_is_default_value(_sg_cfg_set, "network/maxmin_selective_update")),
 155                "Disabling selective update while using the lazy update mechanism is dumb!");
 156   } else {
 157     xbt_die("Unsupported optimization (%s) for this model", optim);
 158   }
 159
 160   if (!p_maxminSystem)
 161     p_maxminSystem = lmm_system_new(m_selectiveUpdate);
 162
 163   routing_model_create(createLink("__loopback__",
 164                                 498000000, NULL, 0.000015, NULL,
 165                                 1 /*SURF_RESOURCE_ON*/, NULL,
 166                                 SURF_LINK_FATPIPE, NULL));
 167
 168   if (p_updateMechanism == UM_LAZY) {
 169   p_actionHeap = xbt_heap_new(8, NULL);
 170   xbt_heap_set_update_callback(p_actionHeap, surf_action_lmm_update_index_heap);
 171   p_modifiedSet = new ActionLmmList();
 172   p_maxminSystem->keep_track = p_modifiedSet;
 173   }
 174 }
 175
 176 Link* NetworkCm02Model::createLink(const char *name,
 177     double bw_initial, tmgr_trace_t bw_trace,
 178     double lat_initial, tmgr_trace_t lat_trace,
 179     int initiallyOn, tmgr_trace_t state_trace,
 180     e_surf_link_sharing_policy_t policy, xbt_dict_t properties)
 181 {
 182   xbt_assert(NULL == Link::byName(name),
 183              "Link '%s' declared several times in the platform",
 184              name);
 185
 186   Link* link = new NetworkCm02Link(this, name, properties, p_maxminSystem, sg_bandwidth_factor * bw_initial,
 187                      initiallyOn, state_trace, bw_initial, bw_trace, lat_initial, lat_trace, policy);
 188   Link::onCreation(link);
 189   return link;
 190 }
 191
 192 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
 193 {
 194   NetworkCm02Action *action;
 195   while ((xbt_heap_size(p_actionHeap) > 0)
 196          && (double_equals(xbt_heap_maxkey(p_actionHeap), now, sg_surf_precision))) {
 197     action = static_cast<NetworkCm02Action*> (xbt_heap_pop(p_actionHeap));
 198     XBT_DEBUG("Something happened to action %p", action);
 199     if (TRACE_is_enabled()) {
 200       int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 201
 202       for (int i = 0; i < n; i++){
 203         lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem, action->getVariable(), i);
 204         NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 205         TRACE_surf_link_set_utilization(link->getName(),
 206                                         action->getCategory(),
 207                                         (lmm_variable_getvalue(action->getVariable())*
 208                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 209                                                 action->getVariable(),
 210                                                 i)),
 211                                         action->getLastUpdate(),
 212                                         now - action->getLastUpdate());
 213       }
 214     }
 215
 216     // if I am wearing a latency hat
 217     if (action->getHat() == LATENCY) {
 218       XBT_DEBUG("Latency paid for action %p. Activating", action);
 219       lmm_update_variable_weight(p_maxminSystem, action->getVariable(), action->m_weight);
 220       action->heapRemove(p_actionHeap);
 221       action->refreshLastUpdate();
 222
 223         // if I am wearing a max_duration or normal hat
 224     } else if (action->getHat() == MAX_DURATION ||
 225         action->getHat() == NORMAL) {
 226         // no need to communicate anymore
 227         // assume that flows that reached max_duration have remaining of 0
 228       XBT_DEBUG("Action %p finished", action);
 229       action->setRemains(0);
 230       action->finish();
 231       action->setState(SURF_ACTION_DONE);
 232       action->heapRemove(p_actionHeap);
 233
 234       action->gapRemove();
 235     }
 236   }
 237   return;
 238 }
 239
 240
 241 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
 242 {
 243   NetworkCm02Action *action;
 244   ActionList *running_actions = getRunningActionSet();
 245
 246   for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
 247      ; it != itend ; it=itNext) {
 248   ++itNext;
 249
 250     action = static_cast<NetworkCm02Action*> (&*it);
 251     XBT_DEBUG("Something happened to action %p", action);
 252       double deltap = delta;
 253       if (action->m_latency > 0) {
 254         if (action->m_latency > deltap) {
 255           double_update(&(action->m_latency), deltap, sg_surf_precision);
 256           deltap = 0.0;
 257         } else {
 258           double_update(&(deltap), action->m_latency, sg_surf_precision);
 259           action->m_latency = 0.0;
 260         }
 261         if (action->m_latency == 0.0 && !(action->isSuspended()))
 262           lmm_update_variable_weight(p_maxminSystem, action->getVariable(),
 263               action->m_weight);
 264       }
 265       if (TRACE_is_enabled()) {
 266         int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 267         for (int i = 0; i < n; i++){
 268           lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem, action->getVariable(), i);
 269
 270           NetworkCm02Link* link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 271           TRACE_surf_link_set_utilization(link->getName(),
 272                                         action->getCategory(),
 273                                         (lmm_variable_getvalue(action->getVariable())*
 274                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 275                                                 action->getVariable(),
 276                                                 i)),
 277                                         action->getLastUpdate(),
 278                                         now - action->getLastUpdate());
 279         }
 280       }
 281       if (!lmm_get_number_of_cnst_from_var (p_maxminSystem, action->getVariable())) {
 282         /* There is actually no link used, hence an infinite bandwidth.
 283          * This happens often when using models like vivaldi.
 284          * In such case, just make sure that the action completes immediately.
 285          */
 286         action->updateRemains(action->getRemains());
 287       }
 288     action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
 289
 290     if (action->getMaxDuration() != NO_MAX_DURATION)
 291       action->updateMaxDuration(delta);
 292
 293     if ((action->getRemains() <= 0) &&
 294         (lmm_get_variable_weight(action->getVariable()) > 0)) {
 295       action->finish();
 296       action->setState(SURF_ACTION_DONE);
 297       action->gapRemove();
 298     } else if (((action->getMaxDuration() != NO_MAX_DURATION)
 299         && (action->getMaxDuration() <= 0))) {
 300       action->finish();
 301       action->setState(SURF_ACTION_DONE);
 302       action->gapRemove();
 303     }
 304   }
 305 }
 306
 307 Action *NetworkCm02Model::communicate(NetCard *src, NetCard *dst,
 308                                                 double size, double rate)
 309 {
 310   unsigned int i;
 311   void *_link;
 312   NetworkCm02Link *link;
 313   int failed = 0;
 314   NetworkCm02Action *action = NULL;
 315   double bandwidth_bound;
 316   double latency = 0.0;
 317   xbt_dynar_t back_route = NULL;
 318   int constraints_per_variable = 0;
 319
 320   xbt_dynar_t route = xbt_dynar_new(sizeof(NetCard*), NULL);
 321
 322   XBT_IN("(%s,%s,%g,%g)", src->name(), dst->name(), size, rate);
 323
 324   routing_platf->getRouteAndLatency(src, dst, &route, &latency);
 325   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 326              "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
 327              src->name(), dst->name());
 328
 329   xbt_dynar_foreach(route, i, _link) {
 330   link = static_cast<NetworkCm02Link*>(_link);
 331     if (link->isOff()) {
 332       failed = 1;
 333       break;
 334     }
 335   }
 336   if (sg_network_crosstraffic == 1) {
 337     routing_platf->getRouteAndLatency(dst, src, &back_route, NULL);
 338     xbt_dynar_foreach(back_route, i, _link) {
 339       link = static_cast<NetworkCm02Link*>(_link);
 340       if (link->isOff()) {
 341         failed = 1;
 342         break;
 343       }
 344     }
 345   }
 346
 347   action = new NetworkCm02Action(this, size, failed);
 348
 349 #ifdef HAVE_LATENCY_BOUND_TRACKING
 350   action->m_latencyLimited = 0;
 351 #endif
 352   action->m_weight = action->m_latency = latency;
 353
 354   action->m_rate = rate;
 355   if (p_updateMechanism == UM_LAZY) {
 356     action->m_indexHeap = -1;
 357     action->m_lastUpdate = surf_get_clock();
 358   }
 359
 360   bandwidth_bound = -1.0;
 361   if (sg_weight_S_parameter > 0) {
 362     xbt_dynar_foreach(route, i, _link) {
 363       link = static_cast<NetworkCm02Link*>(_link);
 364       action->m_weight += sg_weight_S_parameter / link->getBandwidth();
 365     }
 366   }
 367   xbt_dynar_foreach(route, i, _link) {
 368     link = static_cast<NetworkCm02Link*>(_link);
 369     double bb = bandwidthFactor(size) * link->getBandwidth();
 370     bandwidth_bound =
 371         (bandwidth_bound < 0.0) ? bb : std::min(bandwidth_bound, bb);
 372   }
 373
 374   action->m_latCurrent = action->m_latency;
 375   action->m_latency *= latencyFactor(size);
 376   action->m_rate = bandwidthConstraint(action->m_rate, bandwidth_bound, size);
 377   if (m_haveGap) {
 378     xbt_assert(!xbt_dynar_is_empty(route),
 379                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 380
 381     link = *static_cast<NetworkCm02Link **>(xbt_dynar_get_ptr(route, 0));
 382     gapAppend(size, link, action);
 383     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 384               action, src->name(), dst->name(), action->m_senderGap,
 385               action->m_latency);
 386   }
 387
 388   constraints_per_variable = xbt_dynar_length(route);
 389   if (back_route != NULL)
 390     constraints_per_variable += xbt_dynar_length(back_route);
 391
 392   if (action->m_latency > 0) {
 393     action->p_variable = lmm_variable_new(p_maxminSystem, action, 0.0, -1.0,
 394                          constraints_per_variable);
 395     if (p_updateMechanism == UM_LAZY) {
 396       // add to the heap the event when the latency is payed
 397       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 398                 action->m_latency + action->m_lastUpdate);
 399       action->heapInsert(p_actionHeap, action->m_latency + action->m_lastUpdate, xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 400     }
 401   } else
 402     action->p_variable = lmm_variable_new(p_maxminSystem, action, 1.0, -1.0, constraints_per_variable);
 403
 404   if (action->m_rate < 0) {
 405     lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? sg_tcp_gamma / (2.0 * action->m_latCurrent) : -1.0);
 406   } else {
 407     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);
 408   }
 409
 410   xbt_dynar_foreach(route, i, _link) {
 411     link = static_cast<NetworkCm02Link*>(_link);
 412     lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), 1.0);
 413   }
 414
 415   if (sg_network_crosstraffic == 1) {
 416     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 417     xbt_dynar_foreach(back_route, i, _link) {
 418       link = static_cast<NetworkCm02Link*>(_link);
 419       lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), .05);
 420     }
 421     lmm_variable_concurrency_share_set(action->getVariable(),2);
 422   }
 423
 424   xbt_dynar_free(&route);
 425   XBT_OUT();
 426
 427   networkCommunicateCallbacks(action, src, dst, size, rate);
 428   return action;
 429 }
 430
 431 /************
 432  * Resource *
 433  ************/
 434 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model *model, const char *name, xbt_dict_t props,
 435     lmm_system_t system,
 436     double constraint_value,
 437     int initiallyOn, tmgr_trace_t state_trace,
 438     double bw_peak, tmgr_trace_t bw_trace,
 439     double lat_initial, tmgr_trace_t lat_trace,
 440     e_surf_link_sharing_policy_t policy)
 441 : Link(model, name, props, lmm_constraint_new(system, this, constraint_value), state_trace)
 442 {
 443   if (initiallyOn)
 444     turnOn();
 445   else
 446     turnOff();
 447
 448   m_bandwidth.scale = 1.0;
 449   m_bandwidth.peak = bw_peak;
 450   if (bw_trace)
 451     m_bandwidth.event = future_evt_set->add_trace(bw_trace, 0.0, this);
 452   else
 453     m_bandwidth.event = NULL;
 454
 455   m_latency.scale = 1.0;
 456   m_latency.peak = lat_initial;
 457   if (lat_trace)
 458     m_latency.event = future_evt_set->add_trace(lat_trace, 0.0, this);
 459
 460   if (policy == SURF_LINK_FATPIPE)
 461     lmm_constraint_shared(getConstraint());
 462 }
 463
 464
 465
 466 void NetworkCm02Link::apply_event(tmgr_trace_iterator_t triggered, double value)
 467 {
 468
 469   /* Find out which of my iterators was triggered, and react accordingly */
 470   if (triggered == m_bandwidth.event) {
 471     updateBandwidth(value);
 472     tmgr_trace_event_unref(&m_bandwidth.event);
 473
 474   } else if (triggered == m_latency.event) {
 475     updateLatency(value);
 476     tmgr_trace_event_unref(&m_latency.event);
 477
 478   } else if (triggered == m_stateEvent) {
 479     if (value > 0)
 480       turnOn();
 481     else {
 482       lmm_variable_t var = NULL;
 483       lmm_element_t elem = NULL;
 484       double now = surf_get_clock();
 485
 486       turnOff();
 487       while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), getConstraint(), &elem))) {
 488         Action *action = static_cast<Action*>( lmm_variable_id(var) );
 489
 490         if (action->getState() == SURF_ACTION_RUNNING ||
 491             action->getState() == SURF_ACTION_READY) {
 492           action->setFinishTime(now);
 493           action->setState(SURF_ACTION_FAILED);
 494         }
 495       }
 496     }
 497     tmgr_trace_event_unref(&m_stateEvent);
 498   } else {
 499     xbt_die("Unknown event!\n");
 500   }
 501
 502   XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)",
 503        getConstraint());
 504 }
 505
 506 void NetworkCm02Link::updateBandwidth(double value) {
 507
 508   m_bandwidth.peak = value;
 509
 510   lmm_update_constraint_bound(getModel()->getMaxminSystem(), getConstraint(),
 511       sg_bandwidth_factor * (m_bandwidth.peak * m_bandwidth.scale));
 512   TRACE_surf_link_set_bandwidth(surf_get_clock(), getName(), sg_bandwidth_factor * m_bandwidth.peak * m_bandwidth.scale);
 513
 514   if (sg_weight_S_parameter > 0) {
 515     double delta = sg_weight_S_parameter / value - sg_weight_S_parameter / (m_bandwidth.peak * m_bandwidth.scale);
 516
 517     lmm_variable_t var;
 518     lmm_element_t elem = NULL, nextelem = NULL;
 519     int numelem = 0;
 520     while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 521       NetworkCm02Action *action = (NetworkCm02Action*) lmm_variable_id(var);
 522       action->m_weight += delta;
 523       if (!action->isSuspended())
 524         lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 525     }
 526   }
 527 }
 528
 529 void NetworkCm02Link::updateLatency(double value){
 530   double delta = value - m_latency.peak;
 531   lmm_variable_t var = NULL;
 532   lmm_element_t elem = NULL;
 533   lmm_element_t nextelem = NULL;
 534   int numelem = 0;
 535
 536   m_latency.peak = value;
 537
 538   while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 539     NetworkCm02Action *action = (NetworkCm02Action*) lmm_variable_id(var);
 540     action->m_latCurrent += delta;
 541     action->m_weight += delta;
 542     if (action->m_rate < 0)
 543       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(), sg_tcp_gamma / (2.0 * action->m_latCurrent));
 544     else {
 545       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(),
 546                                 std::min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)));
 547
 548       if (action->m_rate < sg_tcp_gamma / (2.0 * action->m_latCurrent)) {
 549         XBT_INFO("Flow is limited BYBANDWIDTH");
 550       } else {
 551         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f", action->m_latCurrent);
 552       }
 553     }
 554     if (!action->isSuspended())
 555       lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 556   }
 557 }
 558
 559 /**********
 560  * Action *
 561  **********/
 562 void NetworkCm02Action::updateRemainingLazy(double now)
 563 {
 564   double delta = 0.0;
 565
 566   if (m_suspended != 0)
 567     return;
 568
 569   delta = now - m_lastUpdate;
 570
 571   if (m_remains > 0) {
 572     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
 573     double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
 574
 575     XBT_DEBUG("Updating action(%p): remains is now %f", this, m_remains);
 576   }
 577
 578   if (m_maxDuration != NO_MAX_DURATION)
 579     double_update(&m_maxDuration, delta, sg_surf_precision);
 580
 581   if (m_remains <= 0 &&
 582       (lmm_get_variable_weight(getVariable()) > 0)) {
 583     finish();
 584     setState(SURF_ACTION_DONE);
 585
 586     heapRemove(getModel()->getActionHeap());
 587   } else if (((m_maxDuration != NO_MAX_DURATION)
 588       && (m_maxDuration <= 0))) {
 589     finish();
 590     setState(SURF_ACTION_DONE);
 591     heapRemove(getModel()->getActionHeap());
 592   }
 593
 594   m_lastUpdate = now;
 595   m_lastValue = lmm_variable_getvalue(getVariable());
 596 }
 597
 598 }
 599 }