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   loopback_     = createLink("__loopback__", 498000000, 0.000015, SURF_LINK_FATPIPE);
 156
 157   if (updateMechanism_ == UM_LAZY) {
 158     actionHeap_ = xbt_heap_new(8, nullptr);
 159     xbt_heap_set_update_callback(actionHeap_, surf_action_lmm_update_index_heap);
 160     modifiedSet_ = new ActionLmmList();
 161     maxminSystem_->keep_track = modifiedSet_;
 162   }
 163 }
 164 NetworkCm02Model::NetworkCm02Model(void (*specificSolveFun)(lmm_system_t self))
 165   : NetworkCm02Model()
 166 {
 167   maxminSystem_->solve_fun = specificSolveFun;
 168 }
 169
 170 LinkImpl* NetworkCm02Model::createLink(const char* name, double bandwidth, double latency,
 171                                        e_surf_link_sharing_policy_t policy)
 172 {
 173   return new NetworkCm02Link(this, name, bandwidth, latency, policy, maxminSystem_);
 174 }
 175
 176 void NetworkCm02Model::updateActionsStateLazy(double now, double /*delta*/)
 177 {
 178   while ((xbt_heap_size(actionHeap_) > 0)
 179          && (double_equals(xbt_heap_maxkey(actionHeap_), now, sg_surf_precision))) {
 180
 181     NetworkCm02Action *action = static_cast<NetworkCm02Action*> (xbt_heap_pop(actionHeap_));
 182     XBT_DEBUG("Something happened to action %p", action);
 183     if (TRACE_is_enabled()) {
 184       int n = lmm_get_number_of_cnst_from_var(maxminSystem_, action->getVariable());
 185
 186       for (int i = 0; i < n; i++){
 187         lmm_constraint_t constraint = lmm_get_cnst_from_var(maxminSystem_, action->getVariable(), i);
 188         NetworkCm02Link *link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 189         double value = lmm_variable_getvalue(action->getVariable())*
 190             lmm_get_cnst_weight_from_var(maxminSystem_, action->getVariable(), i);
 191         TRACE_surf_link_set_utilization(link->cname(), action->getCategory(), value, action->getLastUpdate(),
 192                                         now - action->getLastUpdate());
 193       }
 194     }
 195
 196     // if I am wearing a latency hat
 197     if (action->getHat() == LATENCY) {
 198       XBT_DEBUG("Latency paid for action %p. Activating", action);
 199       lmm_update_variable_weight(maxminSystem_, action->getVariable(), action->weight_);
 200       action->heapRemove(actionHeap_);
 201       action->refreshLastUpdate();
 202
 203         // if I am wearing a max_duration or normal hat
 204     } else if (action->getHat() == MAX_DURATION || action->getHat() == NORMAL) {
 205         // no need to communicate anymore
 206         // assume that flows that reached max_duration have remaining of 0
 207       XBT_DEBUG("Action %p finished", action);
 208       action->setRemains(0);
 209       action->finish();
 210       action->setState(Action::State::done);
 211       action->heapRemove(actionHeap_);
 212
 213       action->gapRemove();
 214     }
 215   }
 216 }
 217
 218
 219 void NetworkCm02Model::updateActionsStateFull(double now, double delta)
 220 {
 221   ActionList *running_actions = getRunningActionSet();
 222
 223   for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
 224      ; it != itend ; it=itNext) {
 225     ++itNext;
 226
 227     NetworkCm02Action *action = static_cast<NetworkCm02Action*> (&*it);
 228     XBT_DEBUG("Something happened to action %p", action);
 229       double deltap = delta;
 230       if (action->latency_ > 0) {
 231         if (action->latency_ > deltap) {
 232           double_update(&(action->latency_), deltap, sg_surf_precision);
 233           deltap = 0.0;
 234         } else {
 235           double_update(&(deltap), action->latency_, sg_surf_precision);
 236           action->latency_ = 0.0;
 237         }
 238         if (action->latency_ == 0.0 && !(action->isSuspended()))
 239           lmm_update_variable_weight(maxminSystem_, action->getVariable(), action->weight_);
 240       }
 241       if (TRACE_is_enabled()) {
 242         int n = lmm_get_number_of_cnst_from_var(maxminSystem_, action->getVariable());
 243         for (int i = 0; i < n; i++){
 244           lmm_constraint_t constraint = lmm_get_cnst_from_var(maxminSystem_, action->getVariable(), i);
 245
 246           NetworkCm02Link* link = static_cast<NetworkCm02Link*>(lmm_constraint_id(constraint));
 247           TRACE_surf_link_set_utilization(link->cname(), action->getCategory(),
 248                                           (lmm_variable_getvalue(action->getVariable()) *
 249                                            lmm_get_cnst_weight_from_var(maxminSystem_, action->getVariable(), i)),
 250                                           action->getLastUpdate(), now - action->getLastUpdate());
 251         }
 252       }
 253       if (!lmm_get_number_of_cnst_from_var (maxminSystem_, action->getVariable())) {
 254         /* There is actually no link used, hence an infinite bandwidth.
 255          * This happens often when using models like vivaldi.
 256          * In such case, just make sure that the action completes immediately.
 257          */
 258         action->updateRemains(action->getRemains());
 259       }
 260     action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
 261
 262     if (action->getMaxDuration() != NO_MAX_DURATION)
 263       action->updateMaxDuration(delta);
 264
 265     if (((action->getRemains() <= 0) && (lmm_get_variable_weight(action->getVariable()) > 0)) ||
 266         ((action->getMaxDuration() > NO_MAX_DURATION) && (action->getMaxDuration() <= 0))) {
 267       action->finish();
 268       action->setState(Action::State::done);
 269       action->gapRemove();
 270     }
 271   }
 272 }
 273
 274 Action* NetworkCm02Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
 275 {
 276   int failed = 0;
 277   double latency = 0.0;
 278   std::vector<LinkImpl*>* back_route = nullptr;
 279   std::vector<LinkImpl*>* route = new std::vector<LinkImpl*>();
 280
 281   XBT_IN("(%s,%s,%g,%g)", src->cname(), dst->cname(), size, rate);
 282
 283   src->routeTo(dst, route, &latency);
 284   xbt_assert(!route->empty() || latency,
 285              "You're trying to send data from %s to %s but there is no connecting path between these two hosts.",
 286              src->cname(), dst->cname());
 287
 288   for (auto link: *route)
 289     if (link->isOff())
 290       failed = 1;
 291
 292   if (sg_network_crosstraffic == 1) {
 293     back_route = new std::vector<LinkImpl*>();
 294     dst->routeTo(src, back_route, nullptr);
 295     for (auto link: *back_route)
 296       if (link->isOff())
 297         failed = 1;
 298   }
 299
 300   NetworkCm02Action *action = new NetworkCm02Action(this, size, failed);
 301   action->weight_ = latency;
 302   action->latency_ = latency;
 303   action->rate_ = rate;
 304   if (updateMechanism_ == UM_LAZY) {
 305     action->indexHeap_ = -1;
 306     action->lastUpdate_ = surf_get_clock();
 307   }
 308
 309   double bandwidth_bound = -1.0;
 310   if (sg_weight_S_parameter > 0)
 311     for (auto link : *route)
 312       action->weight_ += sg_weight_S_parameter / link->bandwidth();
 313
 314   for (auto link : *route) {
 315     double bb       = bandwidthFactor(size) * link->bandwidth();
 316     bandwidth_bound = (bandwidth_bound < 0.0) ? bb : std::min(bandwidth_bound, bb);
 317   }
 318
 319   action->latCurrent_ = action->latency_;
 320   action->latency_ *= latencyFactor(size);
 321   action->rate_ = bandwidthConstraint(action->rate_, bandwidth_bound, size);
 322   if (haveGap_) {
 323     xbt_assert(! route->empty(),
 324                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 325
 326     gapAppend(size, route->at(0), action);
 327     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)", action, src->cname(), dst->cname(), action->senderGap_,
 328               action->latency_);
 329   }
 330
 331   int constraints_per_variable = route->size();
 332   if (back_route != nullptr)
 333     constraints_per_variable += back_route->size();
 334
 335   if (action->latency_ > 0) {
 336     action->variable_ = lmm_variable_new(maxminSystem_, action, 0.0, -1.0, constraints_per_variable);
 337     if (updateMechanism_ == UM_LAZY) {
 338       // add to the heap the event when the latency is payed
 339       XBT_DEBUG("Added action (%p) one latency event at date %f", action, action->latency_ + action->lastUpdate_);
 340       action->heapInsert(actionHeap_, action->latency_ + action->lastUpdate_, route->empty() ? NORMAL : LATENCY);
 341     }
 342   } else
 343     action->variable_ = lmm_variable_new(maxminSystem_, action, 1.0, -1.0, constraints_per_variable);
 344
 345   if (action->rate_ < 0) {
 346     lmm_update_variable_bound(maxminSystem_, action->getVariable(), (action->latCurrent_ > 0) ? sg_tcp_gamma / (2.0 * action->latCurrent_) : -1.0);
 347   } else {
 348     lmm_update_variable_bound(maxminSystem_, action->getVariable(), (action->latCurrent_ > 0) ? std::min(action->rate_, sg_tcp_gamma / (2.0 * action->latCurrent_)) : action->rate_);
 349   }
 350
 351   for (auto link: *route)
 352     lmm_expand(maxminSystem_, link->constraint(), action->getVariable(), 1.0);
 353
 354   if (back_route != nullptr) { //  sg_network_crosstraffic was activated
 355     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 356     for (auto link : *back_route)
 357       lmm_expand(maxminSystem_, link->constraint(), action->getVariable(), .05);
 358
 359     //Change concurrency_share here, if you want that cross-traffic is included in the SURF concurrency
 360     //(You would also have to change lmm_element_concurrency())
 361     //lmm_variable_concurrency_share_set(action->getVariable(),2);
 362   }
 363
 364   delete route;
 365   delete back_route;
 366   XBT_OUT();
 367
 368   simgrid::s4u::Link::onCommunicate(action, src, dst);
 369   return action;
 370 }
 371
 372 void NetworkCm02Model::gapAppend(double size, const LinkImpl* link, NetworkAction* action){
 373     // Nothing
 374 };
 375
 376 /************
 377  * Resource *
 378  ************/
 379 NetworkCm02Link::NetworkCm02Link(NetworkCm02Model* model, const char* name, double bandwidth, double latency,
 380                                  e_surf_link_sharing_policy_t policy, lmm_system_t system)
 381     : LinkImpl(model, name, lmm_constraint_new(system, this, sg_bandwidth_factor * bandwidth))
 382 {
 383   bandwidth_.scale = 1.0;
 384   bandwidth_.peak  = bandwidth;
 385
 386   latency_.scale = 1.0;
 387   latency_.peak  = latency;
 388
 389   if (policy == SURF_LINK_FATPIPE)
 390     lmm_constraint_shared(constraint());
 391
 392   simgrid::s4u::Link::onCreation(this->piface_);
 393 }
 394
 395 void NetworkCm02Link::apply_event(tmgr_trace_iterator_t triggered, double value)
 396 {
 397
 398   /* Find out which of my iterators was triggered, and react accordingly */
 399   if (triggered == bandwidth_.event) {
 400     setBandwidth(value);
 401     tmgr_trace_event_unref(&bandwidth_.event);
 402
 403   } else if (triggered == latency_.event) {
 404     setLatency(value);
 405     tmgr_trace_event_unref(&latency_.event);
 406
 407   } else if (triggered == stateEvent_) {
 408     if (value > 0)
 409       turnOn();
 410     else {
 411       lmm_variable_t var = nullptr;
 412       lmm_element_t elem = nullptr;
 413       double now = surf_get_clock();
 414
 415       turnOff();
 416       while ((var = lmm_get_var_from_cnst(model()->getMaxminSystem(), constraint(), &elem))) {
 417         Action *action = static_cast<Action*>( lmm_variable_id(var) );
 418
 419         if (action->getState() == Action::State::running ||
 420             action->getState() == Action::State::ready) {
 421           action->setFinishTime(now);
 422           action->setState(Action::State::failed);
 423         }
 424       }
 425     }
 426     tmgr_trace_event_unref(&stateEvent_);
 427   } else {
 428     xbt_die("Unknown event!\n");
 429   }
 430
 431   XBT_DEBUG("There was a resource state event, need to update actions related to the constraint (%p)", constraint());
 432 }
 433
 434 void NetworkCm02Link::setBandwidth(double value)
 435 {
 436
 437   bandwidth_.peak = value;
 438
 439   lmm_update_constraint_bound(model()->getMaxminSystem(), constraint(),
 440                               sg_bandwidth_factor * (bandwidth_.peak * bandwidth_.scale));
 441   TRACE_surf_link_set_bandwidth(surf_get_clock(), cname(), sg_bandwidth_factor * bandwidth_.peak * bandwidth_.scale);
 442
 443   if (sg_weight_S_parameter > 0) {
 444     double delta = sg_weight_S_parameter / value - sg_weight_S_parameter / (bandwidth_.peak * bandwidth_.scale);
 445
 446     lmm_variable_t var;
 447     lmm_element_t elem = nullptr;
 448     lmm_element_t nextelem = nullptr;
 449     int numelem = 0;
 450     while ((var = lmm_get_var_from_cnst_safe(model()->getMaxminSystem(), constraint(), &elem, &nextelem, &numelem))) {
 451       NetworkCm02Action *action = static_cast<NetworkCm02Action*>(lmm_variable_id(var));
 452       action->weight_ += delta;
 453       if (!action->isSuspended())
 454         lmm_update_variable_weight(model()->getMaxminSystem(), action->getVariable(), action->weight_);
 455     }
 456   }
 457 }
 458
 459 void NetworkCm02Link::setLatency(double value)
 460 {
 461   double delta           = value - latency_.peak;
 462   lmm_variable_t var = nullptr;
 463   lmm_element_t elem = nullptr;
 464   lmm_element_t nextelem = nullptr;
 465   int numelem = 0;
 466
 467   latency_.peak = value;
 468
 469   while ((var = lmm_get_var_from_cnst_safe(model()->getMaxminSystem(), constraint(), &elem, &nextelem, &numelem))) {
 470     NetworkCm02Action *action = static_cast<NetworkCm02Action*>(lmm_variable_id(var));
 471     action->latCurrent_ += delta;
 472     action->weight_ += delta;
 473     if (action->rate_ < 0)
 474       lmm_update_variable_bound(model()->getMaxminSystem(), action->getVariable(),
 475                                 sg_tcp_gamma / (2.0 * action->latCurrent_));
 476     else {
 477       lmm_update_variable_bound(model()->getMaxminSystem(), action->getVariable(),
 478                                 std::min(action->rate_, sg_tcp_gamma / (2.0 * action->latCurrent_)));
 479
 480       if (action->rate_ < sg_tcp_gamma / (2.0 * action->latCurrent_)) {
 481         XBT_INFO("Flow is limited BYBANDWIDTH");
 482       } else {
 483         XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f", action->latCurrent_);
 484       }
 485     }
 486     if (!action->isSuspended())
 487       lmm_update_variable_weight(model()->getMaxminSystem(), action->getVariable(), action->weight_);
 488   }
 489 }
 490
 491 NetworkCm02Link::~NetworkCm02Link() {}
 492
 493 /**********
 494  * Action *
 495  **********/
 496
 497 NetworkCm02Action::~NetworkCm02Action() {}
 498
 499 void NetworkCm02Action::updateRemainingLazy(double now)
 500 {
 501   if (suspended_ != 0)
 502     return;
 503
 504   double delta = now - lastUpdate_;
 505
 506   if (remains_ > 0) {
 507     XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, remains_, lastUpdate_);
 508     double_update(&(remains_), lastValue_ * delta, sg_maxmin_precision*sg_surf_precision);
 509
 510     XBT_DEBUG("Updating action(%p): remains is now %f", this, remains_);
 511   }
 512
 513   if (maxDuration_ != NO_MAX_DURATION)
 514     double_update(&maxDuration_, delta, sg_surf_precision);
 515
 516   if ((remains_ <= 0 && (lmm_get_variable_weight(getVariable()) > 0)) ||
 517       (((maxDuration_ > NO_MAX_DURATION) && (maxDuration_ <= 0)))){
 518     finish();
 519     setState(Action::State::done);
 520     heapRemove(getModel()->getActionHeap());
 521   }
 522
 523   lastUpdate_ = now;
 524   lastValue_ = lmm_variable_getvalue(getVariable());
 525 }
 526
 527 void NetworkCm02Link::gapAppend(double size, const LinkImpl* link, NetworkAction* action){
 528     // Nothing
 529 };
 530 }
 531 }