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 = xbt_cfg_get_boolean(_sg_cfg_set, "network/maxmin_selective_update");
 162
 163   if (!strcmp(optim, "Full")) {
 164     p_updateMechanism = UM_FULL;
 165     m_selectiveUpdate = select;
 166   } else if (!strcmp(optim, "Lazy")) {
 167     p_updateMechanism = UM_LAZY;
 168     m_selectiveUpdate = 1;
 169     xbt_assert((select == 1) || (xbt_cfg_is_default_value(_sg_cfg_set, "network/maxmin_selective_update")),
 170                "Disabling selective update while using the lazy update mechanism is dumb!");
 171   } else {
 172     xbt_die("Unsupported optimization (%s) for this model", optim);
 173   }
 174
 175   if (!p_maxminSystem)
 176     p_maxminSystem = lmm_system_new(m_selectiveUpdate);
 177
 178   routing_model_create(createLink("__loopback__",
 179                                 498000000, NULL, 0.000015, NULL,
 180                                 1 /*SURF_RESOURCE_ON*/, NULL,
 181                                 SURF_LINK_FATPIPE, NULL));
 182
 183   if (p_updateMechanism == UM_LAZY) {
 184   p_actionHeap = xbt_heap_new(8, NULL);
 185   xbt_heap_set_update_callback(p_actionHeap, surf_action_lmm_update_index_heap);
 186   p_modifiedSet = new ActionLmmList();
 187   p_maxminSystem->keep_track = p_modifiedSet;
 188   }
 189 }
 190
 191 Link* NetworkCm02Model::createLink(const char *name,
 192                                  double bw_initial,
 193                                  tmgr_trace_t bw_trace,
 194                                  double lat_initial,
 195                                  tmgr_trace_t lat_trace,
 196                                  int initiallyOn,
 197                                  tmgr_trace_t state_trace,
 198                                  e_surf_link_sharing_policy_t policy,
 199                                  xbt_dict_t properties)
 200 {
 201   xbt_assert(NULL == Link::byName(name),
 202              "Link '%s' declared several times in the platform",
 203              name);
 204
 205   Link* link = new NetworkCm02Link(this, name, properties, p_maxminSystem, sg_bandwidth_factor * bw_initial,
 206                      initiallyOn, state_trace, bw_initial, bw_trace, lat_initial, lat_trace, policy);
 207   Link::onCreation(link);
 208   return link;
 209 }
 210
 211 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
 212 {
 213   NetworkCm02Action *action;
 214   while ((xbt_heap_size(p_actionHeap) > 0)
 215          && (double_equals(xbt_heap_maxkey(p_actionHeap), now, sg_surf_precision))) {
 216     action = static_cast<NetworkCm02Action*> (xbt_heap_pop(p_actionHeap));
 217     XBT_DEBUG("Something happened to action %p", action);
 218     if (TRACE_is_enabled()) {
 219       int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 220       int i;
 221       for (i = 0; i < n; i++){
 222         lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 223                                                             action->getVariable(),
 224                                                             i);
 225         NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 226         TRACE_surf_link_set_utilization(link->getName(),
 227                                         action->getCategory(),
 228                                         (lmm_variable_getvalue(action->getVariable())*
 229                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 230                                                 action->getVariable(),
 231                                                 i)),
 232                                         action->getLastUpdate(),
 233                                         now - action->getLastUpdate());
 234       }
 235     }
 236
 237     // if I am wearing a latency hat
 238     if (action->getHat() == LATENCY) {
 239       XBT_DEBUG("Latency paid for action %p. Activating", action);
 240       lmm_update_variable_weight(p_maxminSystem, action->getVariable(), action->m_weight);
 241       action->heapRemove(p_actionHeap);
 242       action->refreshLastUpdate();
 243
 244         // if I am wearing a max_duration or normal hat
 245     } else if (action->getHat() == MAX_DURATION ||
 246         action->getHat() == NORMAL) {
 247         // no need to communicate anymore
 248         // assume that flows that reached max_duration have remaining of 0
 249       XBT_DEBUG("Action %p finished", action);
 250       action->setRemains(0);
 251       action->finish();
 252       action->setState(SURF_ACTION_DONE);
 253       action->heapRemove(p_actionHeap);
 254
 255       action->gapRemove();
 256     }
 257   }
 258   return;
 259 }
 260
 261
 262 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
 263 {
 264   NetworkCm02Action *action;
 265   ActionList *running_actions = getRunningActionSet();
 266
 267   for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
 268      ; it != itend ; it=itNext) {
 269   ++itNext;
 270
 271     action = static_cast<NetworkCm02Action*> (&*it);
 272     XBT_DEBUG("Something happened to action %p", action);
 273       double deltap = delta;
 274       if (action->m_latency > 0) {
 275         if (action->m_latency > deltap) {
 276           double_update(&(action->m_latency), deltap, sg_surf_precision);
 277           deltap = 0.0;
 278         } else {
 279           double_update(&(deltap), action->m_latency, sg_surf_precision);
 280           action->m_latency = 0.0;
 281         }
 282         if (action->m_latency == 0.0 && !(action->isSuspended()))
 283           lmm_update_variable_weight(p_maxminSystem, action->getVariable(),
 284               action->m_weight);
 285       }
 286       if (TRACE_is_enabled()) {
 287         int n = lmm_get_number_of_cnst_from_var(p_maxminSystem, action->getVariable());
 288         int i;
 289         for (i = 0; i < n; i++){
 290           lmm_constraint_t constraint = lmm_get_cnst_from_var(p_maxminSystem,
 291                                                             action->getVariable(),
 292                                                             i);
 293           NetworkCm02Link* link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 294           TRACE_surf_link_set_utilization(link->getName(),
 295                                         action->getCategory(),
 296                                         (lmm_variable_getvalue(action->getVariable())*
 297                                             lmm_get_cnst_weight_from_var(p_maxminSystem,
 298                                                 action->getVariable(),
 299                                                 i)),
 300                                         action->getLastUpdate(),
 301                                         now - action->getLastUpdate());
 302         }
 303       }
 304       if (!lmm_get_number_of_cnst_from_var
 305           (p_maxminSystem, action->getVariable())) {
 306         /* There is actually no link used, hence an infinite bandwidth.
 307          * This happens often when using models like vivaldi.
 308          * In such case, just make sure that the action completes immediately.
 309          */
 310         action->updateRemains(action->getRemains());
 311       }
 312     action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
 313
 314     if (action->getMaxDuration() != NO_MAX_DURATION)
 315       action->updateMaxDuration(delta);
 316
 317     if ((action->getRemains() <= 0) &&
 318         (lmm_get_variable_weight(action->getVariable()) > 0)) {
 319       action->finish();
 320       action->setState(SURF_ACTION_DONE);
 321       action->gapRemove();
 322     } else if (((action->getMaxDuration() != NO_MAX_DURATION)
 323         && (action->getMaxDuration() <= 0))) {
 324       action->finish();
 325       action->setState(SURF_ACTION_DONE);
 326       action->gapRemove();
 327     }
 328   }
 329   return;
 330 }
 331
 332 Action *NetworkCm02Model::communicate(NetCard *src, NetCard *dst,
 333                                                 double size, double rate)
 334 {
 335   unsigned int i;
 336   void *_link;
 337   NetworkCm02Link *link;
 338   int failed = 0;
 339   NetworkCm02Action *action = NULL;
 340   double bandwidth_bound;
 341   double latency = 0.0;
 342   xbt_dynar_t back_route = NULL;
 343   int constraints_per_variable = 0;
 344
 345   xbt_dynar_t route = xbt_dynar_new(sizeof(NetCard*), NULL);
 346
 347   XBT_IN("(%s,%s,%g,%g)", src->name(), dst->name(), size, rate);
 348
 349   routing_platf->getRouteAndLatency(src, dst, &route, &latency);
 350   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 351              "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
 352              src->name(), dst->name());
 353
 354   xbt_dynar_foreach(route, i, _link) {
 355   link = static_cast<NetworkCm02Link*>(_link);
 356     if (link->isOff()) {
 357       failed = 1;
 358       break;
 359     }
 360   }
 361   if (sg_network_crosstraffic == 1) {
 362     routing_platf->getRouteAndLatency(dst, src, &back_route, NULL);
 363     xbt_dynar_foreach(back_route, i, _link) {
 364       link = static_cast<NetworkCm02Link*>(_link);
 365       if (link->isOff()) {
 366         failed = 1;
 367         break;
 368       }
 369     }
 370   }
 371
 372   action = new NetworkCm02Action(this, size, failed);
 373
 374 #ifdef HAVE_LATENCY_BOUND_TRACKING
 375   action->m_latencyLimited = 0;
 376 #endif
 377   action->m_weight = action->m_latency = latency;
 378
 379   action->m_rate = rate;
 380   if (p_updateMechanism == UM_LAZY) {
 381     action->m_indexHeap = -1;
 382     action->m_lastUpdate = surf_get_clock();
 383   }
 384
 385   bandwidth_bound = -1.0;
 386   if (sg_weight_S_parameter > 0) {
 387     xbt_dynar_foreach(route, i, _link) {
 388       link = static_cast<NetworkCm02Link*>(_link);
 389       action->m_weight += sg_weight_S_parameter / link->getBandwidth();
 390     }
 391   }
 392   xbt_dynar_foreach(route, i, _link) {
 393   link = static_cast<NetworkCm02Link*>(_link);
 394     double bb = bandwidthFactor(size) * link->getBandwidth();
 395     bandwidth_bound =
 396         (bandwidth_bound < 0.0) ? bb : std::min(bandwidth_bound, bb);
 397   }
 398
 399   action->m_latCurrent = action->m_latency;
 400   action->m_latency *= latencyFactor(size);
 401   action->m_rate = bandwidthConstraint(action->m_rate, bandwidth_bound, size);
 402   if (m_haveGap) {
 403     xbt_assert(!xbt_dynar_is_empty(route),
 404                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 405
 406     link = *static_cast<NetworkCm02Link **>(xbt_dynar_get_ptr(route, 0));
 407     gapAppend(size, link, action);
 408     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 409               action, src->name(), dst->name(), action->m_senderGap,
 410               action->m_latency);
 411   }
 412
 413   constraints_per_variable = xbt_dynar_length(route);
 414   if (back_route != NULL)
 415     constraints_per_variable += xbt_dynar_length(back_route);
 416
 417   if (action->m_latency > 0) {
 418     action->p_variable = lmm_variable_new(p_maxminSystem, action, 0.0, -1.0,
 419                          constraints_per_variable);
 420     if (p_updateMechanism == UM_LAZY) {
 421       // add to the heap the event when the latency is payed
 422       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 423                 action->m_latency + action->m_lastUpdate);
 424       action->heapInsert(p_actionHeap, action->m_latency + action->m_lastUpdate, xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 425     }
 426   } else
 427     action->p_variable = lmm_variable_new(p_maxminSystem, action, 1.0, -1.0, constraints_per_variable);
 428
 429   if (action->m_rate < 0) {
 430     lmm_update_variable_bound(p_maxminSystem, action->getVariable(), (action->m_latCurrent > 0) ? sg_tcp_gamma / (2.0 * action->m_latCurrent) : -1.0);
 431   } else {
 432     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);
 433   }
 434
 435   xbt_dynar_foreach(route, i, _link) {
 436   link = static_cast<NetworkCm02Link*>(_link);
 437     lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), 1.0);
 438   }
 439
 440   if (sg_network_crosstraffic == 1) {
 441     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 442     xbt_dynar_foreach(back_route, i, _link) {
 443       link = static_cast<NetworkCm02Link*>(_link);
 444       lmm_expand(p_maxminSystem, link->getConstraint(), action->getVariable(), .05);
 445     }
 446     lmm_variable_concurrency_share_set(action->getVariable(),2);
 447   }
 448
 449   xbt_dynar_free(&route);
 450   XBT_OUT();
 451
 452   networkCommunicateCallbacks(action, src, dst, size, rate);
 453   return action;
 454 }
 455
 456 /************
 457  * Resource *
 458  ************/
 459 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model *model, const char *name, xbt_dict_t props,
 460                              lmm_system_t system,
 461                              double constraint_value,
 462                              int initiallyOn, tmgr_trace_t state_trace,
 463                              double bw_peak, tmgr_trace_t bw_trace,
 464                              double lat_initial, tmgr_trace_t lat_trace,
 465                              e_surf_link_sharing_policy_t policy)
 466 : Link(model, name, props, lmm_constraint_new(system, this, constraint_value), state_trace)
 467 {
 468   if (initiallyOn)
 469     turnOn();
 470   else
 471     turnOff();
 472
 473   m_bandwidth.scale = 1.0;
 474   m_bandwidth.peak = bw_peak;
 475   if (bw_trace)
 476     m_bandwidth.event = future_evt_set->add_trace(bw_trace, 0.0, this);
 477   else
 478     m_bandwidth.event = NULL;
 479
 480   m_latency.scale = 1.0;
 481   m_latency.peak = lat_initial;
 482   if (lat_trace)
 483     m_latency.event = future_evt_set->add_trace(lat_trace, 0.0, this);
 484
 485   if (policy == SURF_LINK_FATPIPE)
 486   lmm_constraint_shared(getConstraint());
 487 }
 488
 489
 490
 491 void NetworkCm02Link::apply_event(tmgr_trace_iterator_t triggered, double value)
 492 {
 493
 494   /* Find out which of my iterators was triggered, and react accordingly */
 495   if (triggered == m_bandwidth.event) {
 496     updateBandwidth(value);
 497     tmgr_trace_event_unref(&m_bandwidth.event);
 498
 499   } else if (triggered == m_latency.event) {
 500     updateLatency(value);
 501     tmgr_trace_event_unref(&m_latency.event);
 502
 503   } else if (triggered == m_stateEvent) {
 504     if (value > 0)
 505       turnOn();
 506     else {
 507       lmm_variable_t var = NULL;
 508       lmm_element_t elem = NULL;
 509       double now = surf_get_clock();
 510
 511       turnOff();
 512       while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), getConstraint(), &elem))) {
 513         Action *action = static_cast<Action*>( lmm_variable_id(var) );
 514
 515         if (action->getState() == SURF_ACTION_RUNNING ||
 516             action->getState() == SURF_ACTION_READY) {
 517           action->setFinishTime(now);
 518           action->setState(SURF_ACTION_FAILED);
 519         }
 520       }
 521     }
 522     tmgr_trace_event_unref(&m_stateEvent);
 523   } else {
 524     xbt_die("Unknown event!\n");
 525   }
 526
 527   XBT_DEBUG
 528       ("There was a resource state event, need to update actions related to the constraint (%p)",
 529        getConstraint());
 530 }
 531
 532 void NetworkCm02Link::updateBandwidth(double value) {
 533   double delta = sg_weight_S_parameter / value - sg_weight_S_parameter /
 534                  (m_bandwidth.peak * m_bandwidth.scale);
 535   lmm_variable_t var = NULL;
 536   lmm_element_t elem = NULL;
 537   lmm_element_t nextelem = NULL;
 538   int numelem = 0;
 539
 540   NetworkCm02Action *action = NULL;
 541
 542   m_bandwidth.peak = value;
 543   lmm_update_constraint_bound(getModel()->getMaxminSystem(),
 544                               getConstraint(),
 545                               sg_bandwidth_factor *
 546                               (m_bandwidth.peak * m_bandwidth.scale));
 547   TRACE_surf_link_set_bandwidth(surf_get_clock(), getName(), sg_bandwidth_factor * m_bandwidth.peak * m_bandwidth.scale);
 548   if (sg_weight_S_parameter > 0) {
 549     while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 550       action = (NetworkCm02Action*) lmm_variable_id(var);
 551       action->m_weight += delta;
 552       if (!action->isSuspended())
 553         lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 554     }
 555   }
 556 }
 557
 558 void NetworkCm02Link::updateLatency(double value){
 559   double delta = value - m_latency.peak;
 560   lmm_variable_t var = NULL;
 561   lmm_element_t elem = NULL;
 562   lmm_element_t nextelem = NULL;
 563   int numelem = 0;
 564   NetworkCm02Action *action = NULL;
 565
 566   m_latency.peak = value;
 567   while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 568     action = (NetworkCm02Action*) lmm_variable_id(var);
 569     action->m_latCurrent += delta;
 570     action->m_weight += delta;
 571     if (action->m_rate < 0)
 572       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(), sg_tcp_gamma / (2.0 * action->m_latCurrent));
 573     else {
 574       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(),
 575                                 std::min(action->m_rate, sg_tcp_gamma / (2.0 * action->m_latCurrent)));
 576
 577       if (action->m_rate < sg_tcp_gamma / (2.0 * action->m_latCurrent)) {
 578         XBT_INFO("Flow is limited BYBANDWIDTH");
 579       } else {
 580         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 581                  action->m_latCurrent);
 582       }
 583     }
 584     if (!action->isSuspended())
 585       lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->m_weight);
 586   }
 587 }
 588
 589 /**********
 590  * Action *
 591  **********/
 592 void NetworkCm02Action::updateRemainingLazy(double now)
 593 {
 594   double delta = 0.0;
 595
 596   if (m_suspended != 0)
 597     return;
 598
 599   delta = now - m_lastUpdate;
 600
 601   if (m_remains > 0) {
 602     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
 603     double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
 604
 605     XBT_DEBUG("Updating action(%p): remains is now %f", this, m_remains);
 606   }
 607
 608   if (m_maxDuration != NO_MAX_DURATION)
 609     double_update(&m_maxDuration, delta, sg_surf_precision);
 610
 611   if (m_remains <= 0 &&
 612       (lmm_get_variable_weight(getVariable()) > 0)) {
 613     finish();
 614     setState(SURF_ACTION_DONE);
 615
 616     heapRemove(getModel()->getActionHeap());
 617   } else if (((m_maxDuration != NO_MAX_DURATION)
 618       && (m_maxDuration <= 0))) {
 619     finish();
 620     setState(SURF_ACTION_DONE);
 621     heapRemove(getModel()->getActionHeap());
 622   }
 623
 624   m_lastUpdate = now;
 625   m_lastValue = lmm_variable_getvalue(getVariable());
 626 }
 627
 628 }
 629 }