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 "maxmin_private.hpp"
  10 #include "network_cm02.hpp"
  11 #include "simgrid/s4u/host.hpp"
  12 #include "simgrid/sg_config.h"
  13 #include "src/instr/instr_private.h" // TRACE_is_enabled(). FIXME: remove by subscribing tracing to the surf signals
  14
  15 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_network);
  16
  17 double sg_sender_gap = 0.0;
  18 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
  19 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
  20 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
  21
  22 double sg_tcp_gamma = 0.0;
  23 int sg_network_crosstraffic = 0;
  24
  25 /************************************************************************/
  26 /* New model based on optimizations discussed during Pedro Velho's thesis*/
  27 /************************************************************************/
  28 /* @techreport{VELHO:2011:HAL-00646896:1, */
  29 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
  30 /*      title = {{Flow-level network models: have we reached the limits?}}, */
  31 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
  32 /*      type = {Rapport de recherche}, */
  33 /*      institution = {INRIA}, */
  34 /*      number = {RR-7821}, */
  35 /*      year = {2011}, */
  36 /*      month = Nov, */
  37 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
  38 /*  } */
  39 void surf_network_model_init_LegrandVelho()
  40 {
  41   if (surf_network_model)
  42     return;
  43
  44   surf_network_model = new simgrid::surf::NetworkCm02Model();
  45   all_existing_models->push_back(surf_network_model);
  46
  47   xbt_cfg_setdefault_double("network/latency-factor",      13.01);
  48   xbt_cfg_setdefault_double("network/bandwidth-factor",     0.97);
  49   xbt_cfg_setdefault_double("network/weight-S",         20537);
  50 }
  51
  52 /***************************************************************************/
  53 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
  54 /***************************************************************************/
  55 /* @TechReport{      rr-lip2002-40, */
  56 /*   author        = {Henri Casanova and Loris Marchal}, */
  57 /*   institution   = {LIP}, */
  58 /*   title         = {A Network Model for Simulation of Grid Application}, */
  59 /*   number        = {2002-40}, */
  60 /*   month         = {oct}, */
  61 /*   year          = {2002} */
  62 /* } */
  63 void surf_network_model_init_CM02()
  64 {
  65
  66   if (surf_network_model)
  67     return;
  68
  69   surf_network_model = new simgrid::surf::NetworkCm02Model();
  70   all_existing_models->push_back(surf_network_model);
  71
  72   xbt_cfg_setdefault_double("network/latency-factor",   1.0);
  73   xbt_cfg_setdefault_double("network/bandwidth-factor", 1.0);
  74   xbt_cfg_setdefault_double("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()
  88 {
  89   if (surf_network_model)
  90     return;
  91
  92   surf_network_model = new simgrid::surf::NetworkCm02Model(lagrange_solve);
  93   all_existing_models->push_back(surf_network_model);
  94
  95   lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
  96
  97   xbt_cfg_setdefault_double("network/latency-factor",     10.4);
  98   xbt_cfg_setdefault_double("network/bandwidth-factor",    0.92);
  99   xbt_cfg_setdefault_double("network/weight-S",         8775);
 100 }
 101
 102
 103 void surf_network_model_init_Reno2()
 104 {
 105   if (surf_network_model)
 106     return;
 107
 108   surf_network_model = new simgrid::surf::NetworkCm02Model(lagrange_solve);
 109   all_existing_models->push_back(surf_network_model);
 110
 111   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp, func_reno2_fpi);
 112
 113   xbt_cfg_setdefault_double("network/latency-factor",    10.4);
 114   xbt_cfg_setdefault_double("network/bandwidth-factor",   0.92);
 115   xbt_cfg_setdefault_double("network/weight-S",        8775);
 116 }
 117
 118 void surf_network_model_init_Vegas()
 119 {
 120   if (surf_network_model)
 121     return;
 122
 123   surf_network_model = new simgrid::surf::NetworkCm02Model(lagrange_solve);
 124   all_existing_models->push_back(surf_network_model);
 125
 126   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp, func_vegas_fpi);
 127
 128   xbt_cfg_setdefault_double("network/latency-factor",    10.4);
 129   xbt_cfg_setdefault_double("network/bandwidth-factor",   0.92);
 130   xbt_cfg_setdefault_double("network/weight-S",        8775);
 131 }
 132
 133 namespace simgrid {
 134 namespace surf {
 135
 136 NetworkCm02Model::NetworkCm02Model()
 137   :NetworkModel()
 138 {
 139   char *optim = xbt_cfg_get_string("network/optim");
 140   bool select = xbt_cfg_get_boolean("network/maxmin-selective-update");
 141
 142   if (!strcmp(optim, "Full")) {
 143     updateMechanism_ = UM_FULL;
 144     selectiveUpdate_ = select;
 145   } else if (!strcmp(optim, "Lazy")) {
 146     updateMechanism_ = UM_LAZY;
 147     selectiveUpdate_ = true;
 148     xbt_assert(select || (xbt_cfg_is_default_value("network/maxmin-selective-update")),
 149                "You cannot disable selective update when using the lazy update mechanism");
 150   } else {
 151     xbt_die("Unsupported optimization (%s) for this model. Accepted: Full, Lazy.", optim);
 152   }
 153
 154   maxminSystem_ = lmm_system_new(selectiveUpdate_);
 155
 156   routing_model_create(createLink("__loopback__", 498000000, 0.000015, SURF_LINK_FATPIPE, nullptr));
 157
 158   if (updateMechanism_ == UM_LAZY) {
 159     actionHeap_ = xbt_heap_new(8, nullptr);
 160     xbt_heap_set_update_callback(actionHeap_, surf_action_lmm_update_index_heap);
 161     modifiedSet_ = new ActionLmmList();
 162     maxminSystem_->keep_track = modifiedSet_;
 163   }
 164 }
 165 NetworkCm02Model::NetworkCm02Model(void (*specificSolveFun)(lmm_system_t self))
 166   : NetworkCm02Model()
 167 {
 168   maxminSystem_->solve_fun = specificSolveFun;
 169 }
 170
 171
 172 NetworkCm02Model::~NetworkCm02Model() {}
 173
 174 Link* NetworkCm02Model::createLink(const char *name, double bandwidth, double latency, e_surf_link_sharing_policy_t policy,
 175     xbt_dict_t properties)
 176 {
 177   return new NetworkCm02Link(this, name, properties, bandwidth, latency, policy, maxminSystem_);
 178 }
 179
 180 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
 181 {
 182   while ((xbt_heap_size(actionHeap_) > 0)
 183          && (double_equals(xbt_heap_maxkey(actionHeap_), now, sg_surf_precision))) {
 184
 185     NetworkCm02Action *action = static_cast<NetworkCm02Action*> (xbt_heap_pop(actionHeap_));
 186     XBT_DEBUG("Something happened to action %p", action);
 187     if (TRACE_is_enabled()) {
 188       int n = lmm_get_number_of_cnst_from_var(maxminSystem_, action->getVariable());
 189
 190       for (int i = 0; i < n; i++){
 191         lmm_constraint_t constraint = lmm_get_cnst_from_var(maxminSystem_, action->getVariable(), i);
 192         NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 193         double value = lmm_variable_getvalue(action->getVariable())*
 194             lmm_get_cnst_weight_from_var(maxminSystem_, action->getVariable(), i);
 195         TRACE_surf_link_set_utilization(link->getName(), action->getCategory(), value,
 196            action->getLastUpdate(), now - action->getLastUpdate());
 197       }
 198     }
 199
 200     // if I am wearing a latency hat
 201     if (action->getHat() == LATENCY) {
 202       XBT_DEBUG("Latency paid for action %p. Activating", action);
 203       lmm_update_variable_weight(maxminSystem_, action->getVariable(), action->weight_);
 204       action->heapRemove(actionHeap_);
 205       action->refreshLastUpdate();
 206
 207         // if I am wearing a max_duration or normal hat
 208     } else if (action->getHat() == MAX_DURATION || action->getHat() == NORMAL) {
 209         // no need to communicate anymore
 210         // assume that flows that reached max_duration have remaining of 0
 211       XBT_DEBUG("Action %p finished", action);
 212       action->setRemains(0);
 213       action->finish();
 214       action->setState(Action::State::done);
 215       action->heapRemove(actionHeap_);
 216
 217       action->gapRemove();
 218     }
 219   }
 220   return;
 221 }
 222
 223
 224 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
 225 {
 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     NetworkCm02Action *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(s4u::Host* src, s4u::Host* 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 = nullptr;
 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().c_str(), dst->name().c_str(), size, rate);
 300
 301   routing_platf->getRouteAndLatency(src->pimpl_netcard, dst->pimpl_netcard, 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().c_str(), dst->name().c_str());
 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->pimpl_netcard, src->pimpl_netcard, back_route, nullptr);
 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->bandwidth();
 331
 332   for (auto link : *route) {
 333     double bb       = bandwidthFactor(size) * link->bandwidth();
 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().c_str(), dst->name().c_str(), action->senderGap_,
 346               action->latency_);
 347   }
 348
 349   constraints_per_variable = route->size();
 350   if (back_route != nullptr)
 351     constraints_per_variable += back_route->size();
 352
 353   if (action->latency_ > 0) {
 354     action->variable_ = lmm_variable_new(maxminSystem_, action, 0.0, -1.0, constraints_per_variable);
 355     if (updateMechanism_ == UM_LAZY) {
 356       // add to the heap the event when the latency is payed
 357       XBT_DEBUG("Added action (%p) one latency event at date %f", action, action->latency_ + action->lastUpdate_);
 358       action->heapInsert(actionHeap_, action->latency_ + action->lastUpdate_, route->empty() ? NORMAL : LATENCY);
 359     }
 360   } else
 361     action->variable_ = lmm_variable_new(maxminSystem_, action, 1.0, -1.0, constraints_per_variable);
 362
 363   if (action->rate_ < 0) {
 364     lmm_update_variable_bound(maxminSystem_, action->getVariable(), (action->latCurrent_ > 0) ? sg_tcp_gamma / (2.0 * action->latCurrent_) : -1.0);
 365   } else {
 366     lmm_update_variable_bound(maxminSystem_, action->getVariable(), (action->latCurrent_ > 0) ? std::min(action->rate_, sg_tcp_gamma / (2.0 * action->latCurrent_)) : action->rate_);
 367   }
 368
 369   for (auto link: *route)
 370     lmm_expand(maxminSystem_, link->getConstraint(), action->getVariable(), 1.0);
 371
 372   if (sg_network_crosstraffic == 1) {
 373     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 374     for (auto link : *back_route)
 375       lmm_expand(maxminSystem_, link->getConstraint(), action->getVariable(), .05);
 376
 377     //Change concurrency_share here, if you want that cross-traffic is included in the SURF concurrency
 378     //(You would also have to change lmm_element_concurrency())
 379     //lmm_variable_concurrency_share_set(action->getVariable(),2);
 380   }
 381
 382   delete route;
 383   delete back_route;
 384   XBT_OUT();
 385
 386   Link::onCommunicate(action, src, dst);
 387   return action;
 388 }
 389
 390 void NetworkCm02Model::gapAppend(double size, const Link* link, NetworkAction* action)
 391 {
 392   // Nothing
 393 };
 394
 395 /************
 396  * Resource *
 397  ************/
 398 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model* model, const char* name, xbt_dict_t props, double bandwidth,
 399                                  double latency, e_surf_link_sharing_policy_t policy, lmm_system_t system)
 400     : Link(model, name, lmm_constraint_new(system, this, sg_bandwidth_factor * bandwidth), props)
 401 {
 402   bandwidth_.scale = 1.0;
 403   bandwidth_.peak  = bandwidth;
 404
 405   latency_.scale = 1.0;
 406   latency_.peak  = latency;
 407
 408   if (policy == SURF_LINK_FATPIPE)
 409     lmm_constraint_shared(getConstraint());
 410
 411   Link::onCreation(this);
 412 }
 413
 414
 415
 416 void NetworkCm02Link::apply_event(tmgr_trace_iterator_t triggered, double value)
 417 {
 418
 419   /* Find out which of my iterators was triggered, and react accordingly */
 420   if (triggered == bandwidth_.event) {
 421     setBandwidth(value);
 422     tmgr_trace_event_unref(&bandwidth_.event);
 423
 424   } else if (triggered == latency_.event) {
 425     setLatency(value);
 426     tmgr_trace_event_unref(&latency_.event);
 427
 428   } else if (triggered == stateEvent_) {
 429     if (value > 0)
 430       turnOn();
 431     else {
 432       lmm_variable_t var = nullptr;
 433       lmm_element_t elem = nullptr;
 434       double now = surf_get_clock();
 435
 436       turnOff();
 437       while ((var = lmm_get_var_from_cnst(getModel()->getMaxminSystem(), getConstraint(), &elem))) {
 438         Action *action = static_cast<Action*>( lmm_variable_id(var) );
 439
 440         if (action->getState() == Action::State::running ||
 441             action->getState() == Action::State::ready) {
 442           action->setFinishTime(now);
 443           action->setState(Action::State::failed);
 444         }
 445       }
 446     }
 447     tmgr_trace_event_unref(&stateEvent_);
 448   } else {
 449     xbt_die("Unknown event!\n");
 450   }
 451
 452   XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)",
 453        getConstraint());
 454 }
 455
 456 void NetworkCm02Link::setBandwidth(double value)
 457 {
 458
 459   bandwidth_.peak = value;
 460
 461   lmm_update_constraint_bound(getModel()->getMaxminSystem(), getConstraint(),
 462                               sg_bandwidth_factor * (bandwidth_.peak * bandwidth_.scale));
 463   TRACE_surf_link_set_bandwidth(surf_get_clock(), getName(), sg_bandwidth_factor * bandwidth_.peak * bandwidth_.scale);
 464
 465   if (sg_weight_S_parameter > 0) {
 466     double delta = sg_weight_S_parameter / value - sg_weight_S_parameter / (bandwidth_.peak * bandwidth_.scale);
 467
 468     lmm_variable_t var;
 469     lmm_element_t elem = nullptr, nextelem = nullptr;
 470     int numelem = 0;
 471     while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 472       NetworkCm02Action *action = (NetworkCm02Action*) lmm_variable_id(var);
 473       action->weight_ += delta;
 474       if (!action->isSuspended())
 475         lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->weight_);
 476     }
 477   }
 478 }
 479
 480 void NetworkCm02Link::setLatency(double value)
 481 {
 482   double delta           = value - latency_.peak;
 483   lmm_variable_t var = nullptr;
 484   lmm_element_t elem = nullptr;
 485   lmm_element_t nextelem = nullptr;
 486   int numelem = 0;
 487
 488   latency_.peak = value;
 489
 490   while ((var = lmm_get_var_from_cnst_safe(getModel()->getMaxminSystem(), getConstraint(), &elem, &nextelem, &numelem))) {
 491     NetworkCm02Action *action = (NetworkCm02Action*) lmm_variable_id(var);
 492     action->latCurrent_ += delta;
 493     action->weight_ += delta;
 494     if (action->rate_ < 0)
 495       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(), sg_tcp_gamma / (2.0 * action->latCurrent_));
 496     else {
 497       lmm_update_variable_bound(getModel()->getMaxminSystem(), action->getVariable(),
 498                                 std::min(action->rate_, sg_tcp_gamma / (2.0 * action->latCurrent_)));
 499
 500       if (action->rate_ < sg_tcp_gamma / (2.0 * action->latCurrent_)) {
 501         XBT_INFO("Flow is limited BYBANDWIDTH");
 502       } else {
 503         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f", action->latCurrent_);
 504       }
 505     }
 506     if (!action->isSuspended())
 507       lmm_update_variable_weight(getModel()->getMaxminSystem(), action->getVariable(), action->weight_);
 508   }
 509 }
 510
 511 NetworkCm02Link::~NetworkCm02Link() {}
 512
 513 /**********
 514  * Action *
 515  **********/
 516
 517 NetworkCm02Action::~NetworkCm02Action() {}
 518
 519 void NetworkCm02Action::updateRemainingLazy(double now)
 520 {
 521   double delta = 0.0;
 522
 523   if (suspended_ != 0)
 524     return;
 525
 526   delta = now - lastUpdate_;
 527
 528   if (remains_ > 0) {
 529     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, remains_, lastUpdate_);
 530     double_update(&(remains_), lastValue_ * delta, sg_maxmin_precision*sg_surf_precision);
 531
 532     XBT_DEBUG("Updating action(%p): remains is now %f", this, remains_);
 533   }
 534
 535   if (maxDuration_ != NO_MAX_DURATION)
 536     double_update(&maxDuration_, delta, sg_surf_precision);
 537
 538   if (remains_ <= 0 &&
 539       (lmm_get_variable_weight(getVariable()) > 0)) {
 540     finish();
 541     setState(Action::State::done);
 542
 543     heapRemove(getModel()->getActionHeap());
 544   } else if (((maxDuration_ != NO_MAX_DURATION)
 545       && (maxDuration_ <= 0))) {
 546     finish();
 547     setState(Action::State::done);
 548     heapRemove(getModel()->getActionHeap());
 549   }
 550
 551   lastUpdate_ = now;
 552   lastValue_ = lmm_variable_getvalue(getVariable());
 553 }
 554
 555 void NetworkCm02Link::gapAppend(double size, const Link* link, NetworkAction* action)
 556 {
 557   // Nothing
 558 };
 559
 560 }
 561 }