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