src/surf/network_im.c

   1
   2 /*
   3  * Network with improved management of tasks, IM (Improved Management).
   4  * Uses a heap to store actions so that the share_resources is faster.
   5  * This model automatically sets the selective update flag to 1 and is
   6  * highly dependent on the maxmin lmm module.
   7  */
   8
   9 /* Copyright (c) 2009, 2010, 2011. The SimGrid Team.
  10  * All rights reserved.                                                     */
  11
  12 /* This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the license (GNU LGPL) which comes with this package. */
  14
  15 #include "network_private.h"
  16 #include "xbt/log.h"
  17 #include "xbt/str.h"
  18
  19 #include "surf_private.h"
  20 #include "xbt/dict.h"
  21 #include "maxmin_private.h"
  22 #include "surf/surfxml_parse_values.h"
  23 #include "surf/surf_resource.h"
  24 #include "surf/surf_resource_lmm.h"
  25
  26
  27 #undef GENERIC_ACTION
  28 #define GENERIC_ACTION(action) action->generic_action
  29
  30
  31 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_network, surf,
  32                                 "Logging specific to the SURF network module");
  33
  34 surf_model_t surf_network_model = NULL;
  35 static lmm_system_t network_im_maxmin_system = NULL;
  36 static void (*network_im_solve) (lmm_system_t) = NULL;
  37
  38 double sg_sender_gap = 0.0;
  39 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
  40 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
  41 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
  42
  43 double sg_tcp_gamma = 0.0;
  44 int sg_network_crosstraffic = 0;
  45
  46 xbt_dict_t gap_lookup = NULL;
  47
  48 e_UM_t network_update_mechanism = UM_FULL;
  49
  50 typedef struct network_link_CM02_im {
  51   s_surf_resource_lmm_t lmm_resource;   /* must remain first to be added to a trace */
  52
  53   /* Using this object with the public part of
  54      model does not make sense */
  55   double lat_current;
  56   tmgr_trace_event_t lat_event;
  57 } s_link_CM02_im_t, *link_CM02_im_t;
  58
  59 static int im_net_action_is_suspended(surf_action_t action);
  60 static void im_net_update_actions_state(double now, double delta);
  61 static void update_action_remaining(double now);
  62
  63 static xbt_swag_t im_net_modified_set = NULL;
  64 static xbt_heap_t im_net_action_heap = NULL;
  65 xbt_swag_t keep_track = NULL;
  66 extern int sg_maxmin_selective_update;
  67
  68 #ifdef HAVE_SMPI
  69 static void gap_append(double size, const link_CM02_im_t link, surf_action_network_CM02_im_t action);
  70 static void gap_unknown(surf_action_network_CM02_im_t action);
  71 static void gap_remove(surf_action_network_CM02_im_t action);
  72 #endif
  73
  74 /* added to manage the communication action's heap */
  75 static void im_net_action_update_index_heap(void *action, int i)
  76 {
  77   ((surf_action_network_CM02_im_t) action)->index_heap = i;
  78 }
  79
  80 /* insert action on heap using a given key and a hat (heap_action_type)
  81  * a hat can be of three types for communications:
  82  *
  83  * NORMAL = this is a normal heap entry stating the date to finish transmitting
  84  * LATENCY = this is a heap entry to warn us when the latency is payed
  85  * MAX_DURATION =this is a heap entry to warn us when the max_duration limit is reached
  86  */
  87 static void heap_insert(surf_action_network_CM02_im_t    action, double key, enum heap_action_type hat){
  88   action->hat = hat;
  89   xbt_heap_push(im_net_action_heap, action, key);
  90 }
  91
  92 static void heap_remove(surf_action_network_CM02_im_t action){
  93   action->hat = NONE;
  94   if(((surf_action_network_CM02_im_t) action)->index_heap >= 0){
  95       xbt_heap_remove(im_net_action_heap,action->index_heap);
  96   }
  97 }
  98
  99 /******************************************************************************/
 100 /*                           Factors callbacks                                */
 101 /******************************************************************************/
 102 static double im_constant_latency_factor(double size)
 103 {
 104   return sg_latency_factor;
 105 }
 106
 107 static double im_constant_bandwidth_factor(double size)
 108 {
 109   return sg_bandwidth_factor;
 110 }
 111
 112 static double im_constant_bandwidth_constraint(double rate, double bound,
 113                                             double size)
 114 {
 115   return rate;
 116 }
 117
 118
 119 /**********************/
 120 /*   SMPI callbacks   */
 121 /**********************/
 122 static double smpi_latency_factor(double size)
 123 {
 124   /* 1 B <= size <= 1 KiB */
 125   if (size <= 1024.0) {
 126     return 1.0056;
 127   }
 128
 129   /* 2 KiB <= size <= 32 KiB */
 130   if (size <= 32768.0) {
 131     return 1.8805;
 132   }
 133
 134   /* 64 KiB <= size <= 4 MiB */
 135   return 22.7111;
 136 }
 137
 138 static double smpi_bandwidth_factor(double size)
 139 {
 140   /* 1 B <= size <= 1 KiB */
 141   if (size <= 1024.0) {
 142     return 0.2758;
 143   }
 144
 145   /* 2 KiB <= size <= 32 KiB */
 146   if (size <= 32768.0) {
 147     return 0.5477;
 148   }
 149
 150   /* 64 KiB <= size <= 4 MiB */
 151   return 0.9359;
 152 }
 153
 154 static double smpi_bandwidth_constraint(double rate, double bound,
 155                                         double size)
 156 {
 157   return rate < 0 ? bound : min(bound, rate * smpi_bandwidth_factor(size));
 158 }
 159
 160 static double (*im_latency_factor_callback) (double) =
 161     &im_constant_latency_factor;
 162 static double (*im_bandwidth_factor_callback) (double) =
 163     &im_constant_bandwidth_factor;
 164 static double (*im_bandwidth_constraint_callback) (double, double, double) =
 165     &im_constant_bandwidth_constraint;
 166
 167
 168 static void* im_net_create_resource(const char *name,
 169                                 double bw_initial,
 170                                 tmgr_trace_t bw_trace,
 171                                 double lat_initial,
 172                                 tmgr_trace_t lat_trace,
 173                                 e_surf_resource_state_t
 174                                 state_initial,
 175                                 tmgr_trace_t state_trace,
 176                                 e_surf_link_sharing_policy_t
 177                                 policy, xbt_dict_t properties)
 178 {
 179   link_CM02_im_t nw_link = (link_CM02_im_t)
 180       surf_resource_lmm_new(sizeof(s_link_CM02_im_t),
 181                             surf_network_model, name, properties,
 182                             network_im_maxmin_system,
 183                             sg_bandwidth_factor * bw_initial,
 184                             history,
 185                             state_initial, state_trace,
 186                             bw_initial, bw_trace);
 187
 188   xbt_assert(!xbt_lib_get_or_null(link_lib, name, SURF_LINK_LEVEL),
 189               "Link '%s' declared several times in the platform file.",
 190               name);
 191
 192   nw_link->lat_current = lat_initial;
 193   if (lat_trace)
 194     nw_link->lat_event =
 195         tmgr_history_add_trace(history, lat_trace, 0.0, 0, nw_link);
 196
 197   if (policy == SURF_LINK_FATPIPE)
 198     lmm_constraint_shared(nw_link->lmm_resource.constraint);
 199
 200   xbt_lib_set(link_lib, name, SURF_LINK_LEVEL, nw_link);
 201
 202   return nw_link;
 203 }
 204
 205 static void im_net_parse_link_init(sg_platf_link_cbarg_t link)
 206 {
 207   if(link->policy == SURF_LINK_FULLDUPLEX){
 208     char *link_id;
 209     link_id = bprintf("%s_UP", link->id);
 210           im_net_create_resource(link_id,
 211                            link->bandwidth,
 212                            link->bandwidth_trace,
 213                            link->latency,
 214                            link->latency_trace,
 215                            link->state,
 216                            link->state_trace,
 217                            link->policy,
 218                            link->properties);
 219           xbt_free(link_id);
 220     link_id = bprintf("%s_DOWN", link->id);
 221     im_net_create_resource(link_id,
 222                         link->bandwidth,
 223                         link->bandwidth_trace,
 224                         link->latency,
 225                         link->latency_trace,
 226                         link->state,
 227                         link->state_trace,
 228                         link->policy,
 229                         link->properties);
 230     xbt_free(link_id);
 231   }
 232   else{
 233     im_net_create_resource(link->id,
 234                         link->bandwidth,
 235                         link->bandwidth_trace,
 236                         link->latency,
 237                         link->latency_trace,
 238                         link->state,
 239                         link->state_trace,
 240                         link->policy,
 241                         link->properties);
 242   }
 243 }
 244
 245 static void im_net_add_traces(void)
 246 {
 247   xbt_dict_cursor_t cursor = NULL;
 248   char *trace_name, *elm;
 249
 250   static int called = 0;
 251   if (called)
 252     return;
 253   called = 1;
 254
 255   /* connect all traces relative to network */
 256   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 257     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 258     link_CM02_im_t link =
 259                 xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 260
 261     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 262                 trace_name, elm);
 263     xbt_assert(trace,
 264                 "Cannot connect trace %s to link %s: trace undefined",
 265                 trace_name, elm);
 266
 267     link->lmm_resource.state_event =
 268         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 269   }
 270
 271   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 272     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 273     link_CM02_im_t link =
 274                 xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 275
 276     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 277                 trace_name, elm);
 278     xbt_assert(trace,
 279                 "Cannot connect trace %s to link %s: trace undefined",
 280                 trace_name, elm);
 281
 282     link->lmm_resource.power.event =
 283         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 284   }
 285
 286   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 287     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 288     link_CM02_im_t link =
 289                 xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 290
 291     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 292                 trace_name, elm);
 293     xbt_assert(trace,
 294                 "Cannot connect trace %s to link %s: trace undefined",
 295                 trace_name, elm);
 296
 297     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 298   }
 299 }
 300
 301 static void im_net_define_callbacks(void)
 302 {
 303   /* Figuring out the network links */
 304   sg_platf_link_add_cb(im_net_parse_link_init);
 305   sg_platf_postparse_add_cb(im_net_add_traces);
 306 }
 307
 308 static int im_net_resource_used(void *resource_id)
 309 {
 310   return lmm_constraint_used(network_im_maxmin_system,
 311                              ((surf_resource_lmm_t)
 312                               resource_id)->constraint);
 313 }
 314
 315 static int im_net_action_unref(surf_action_t action)
 316 {
 317   action->refcount--;
 318   if (!action->refcount) {
 319     xbt_swag_remove(action, action->state_set);
 320     if (((surf_action_network_CM02_im_t) action)->variable){
 321       lmm_variable_free(network_im_maxmin_system,
 322                         ((surf_action_network_CM02_im_t) action)->variable);
 323     }
 324     if(network_update_mechanism == UM_LAZY){// remove action from the heap
 325       heap_remove((surf_action_network_CM02_im_t) action);
 326       xbt_swag_remove(action, im_net_modified_set);
 327     }
 328 #ifdef HAVE_TRACING
 329     xbt_free(((surf_action_network_CM02_im_t) action)->src_name);
 330     xbt_free(((surf_action_network_CM02_im_t) action)->dst_name);
 331     xbt_free(action->category);
 332 #endif
 333     surf_action_free(&action);
 334     return 1;
 335   }
 336   return 0;
 337 }
 338
 339
 340
 341 static void im_net_action_cancel(surf_action_t action)
 342 {
 343   surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 344   if(network_update_mechanism == UM_LAZY){// remove action from the heap
 345     xbt_swag_remove(action, im_net_modified_set);
 346     heap_remove((surf_action_network_CM02_im_t) action);
 347   }
 348 }
 349
 350 void im_net_action_recycle(surf_action_t action)
 351 {
 352   return;
 353 }
 354
 355 #ifdef HAVE_LATENCY_BOUND_TRACKING
 356 static int im_net_get_link_latency_limited(surf_action_t action)
 357 {
 358   return action->latency_limited;
 359 }
 360 #endif
 361
 362 double im_net_action_get_remains(surf_action_t action)
 363 {
 364   if(network_update_mechanism == UM_LAZY)/* update remains before return it */
 365     update_action_remaining(surf_get_clock());
 366   return action->remains;
 367 }
 368
 369 static void update_action_remaining(double now){
 370   surf_action_network_CM02_im_t action = NULL;
 371   double delta = 0.0;
 372
 373   xbt_swag_foreach(action, im_net_modified_set) {
 374
 375     if(action->suspended != 0){
 376         continue;
 377     }
 378
 379     delta = now - action->last_update;
 380
 381     double_update(&(action->generic_action.remains),
 382                   lmm_variable_getvalue(action->variable) * delta);
 383
 384     if (action->generic_action.max_duration != NO_MAX_DURATION)
 385       double_update(&(action->generic_action.max_duration), delta);
 386
 387     if ((action->generic_action.remains <= 0) &&
 388         (lmm_get_variable_weight(action->variable) > 0)) {
 389       action->generic_action.finish = surf_get_clock();
 390       surf_network_model->action_state_set((surf_action_t) action,
 391                                            SURF_ACTION_DONE);
 392       heap_remove(action);
 393     } else if ((action->generic_action.max_duration != NO_MAX_DURATION)
 394                && (action->generic_action.max_duration <= 0)) {
 395       action->generic_action.finish = surf_get_clock();
 396       surf_network_model->action_state_set((surf_action_t) action,
 397                                            SURF_ACTION_DONE);
 398       heap_remove(action);
 399     }
 400
 401     action->last_update = now;
 402   }
 403 }
 404
 405 static double net_share_resources_full(double now)
 406 {
 407   s_surf_action_network_CM02_im_t s_action;
 408   surf_action_network_CM02_im_t action = NULL;
 409   xbt_swag_t running_actions =
 410       surf_network_model->states.running_action_set;
 411   double min;
 412
 413   min = generic_maxmin_share_resources(running_actions,
 414                                        xbt_swag_offset(s_action,
 415                                                        variable),
 416                                        network_im_maxmin_system,
 417                                        network_im_solve);
 418
 419 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 420
 421   xbt_swag_foreach(action, running_actions) {
 422 #ifdef HAVE_LATENCY_BOUND_TRACKING
 423     if (lmm_is_variable_limited_by_latency(action->variable)) {
 424       (action->generic_action).latency_limited = 1;
 425     } else {
 426       (action->generic_action).latency_limited = 0;
 427     }
 428 #endif
 429     if (action->latency > 0) {
 430       if (min < 0)
 431         min = action->latency;
 432       else if (action->latency < min)
 433         min = action->latency;
 434     }
 435   }
 436
 437   XBT_DEBUG("Min of share resources %f", min);
 438
 439   return min;
 440 }
 441
 442 static double net_share_resources_lazy(double now)
 443 {
 444   surf_action_network_CM02_im_t action = NULL;
 445   double min=-1;
 446   double value;
 447
 448   XBT_DEBUG("Before share resources, the size of modified actions set is %d", xbt_swag_size(im_net_modified_set));
 449   update_action_remaining(now);
 450
 451   keep_track = im_net_modified_set;
 452   lmm_solve(network_im_maxmin_system);
 453   keep_track = NULL;
 454
 455   XBT_DEBUG("After share resources, The size of modified actions set is %d", xbt_swag_size(im_net_modified_set));
 456
 457    xbt_swag_foreach(action, im_net_modified_set) {
 458      if (GENERIC_ACTION(action).state_set != surf_network_model->states.running_action_set){
 459        continue;
 460      }
 461
 462      /* bogus priority, skip it */
 463      if (GENERIC_ACTION(action).priority <= 0){
 464          continue;
 465      }
 466
 467      min = -1;
 468      value = lmm_variable_getvalue(action->variable);
 469      if (value > 0) {
 470          if (GENERIC_ACTION(action).remains > 0) {
 471              value = GENERIC_ACTION(action).remains / value;
 472              min = now + value;
 473          } else {
 474              value = 0.0;
 475              min = now;
 476          }
 477      }
 478
 479      if ((GENERIC_ACTION(action).max_duration != NO_MAX_DURATION)
 480          && (min == -1
 481              || GENERIC_ACTION(action).start +
 482              GENERIC_ACTION(action).max_duration < min)){
 483        min =   GENERIC_ACTION(action).start +
 484                GENERIC_ACTION(action).max_duration;
 485      }
 486
 487      XBT_DEBUG("Action(%p) Start %lf Finish %lf Max_duration %lf", action,
 488                 GENERIC_ACTION(action).start, now + value,
 489                 GENERIC_ACTION(action).max_duration);
 490
 491
 492
 493      if (action->index_heap >= 0) {
 494          heap_remove((surf_action_network_CM02_im_t) action);
 495      }
 496
 497      if (min != -1) {
 498          heap_insert((surf_action_network_CM02_im_t) action, min, NORMAL);
 499          XBT_DEBUG("Insert at heap action(%p) min %lf now %lf", action, min, now);
 500      }
 501    }
 502
 503    //hereafter must have already the min value for this resource model
 504    if(xbt_heap_size(im_net_action_heap) > 0 ){
 505        min = xbt_heap_maxkey(im_net_action_heap) - now ;
 506    }else{
 507        min = -1;
 508    }
 509
 510    XBT_DEBUG("The minimum with the HEAP %lf", min);
 511
 512
 513   return min;
 514 }
 515
 516 static void net_update_actions_state_full(double now, double delta)
 517 {
 518   double deltap = 0.0;
 519   surf_action_network_CM02_im_t action = NULL;
 520   surf_action_network_CM02_im_t next_action = NULL;
 521   xbt_swag_t running_actions =
 522       surf_network_model->states.running_action_set;
 523   /*
 524      xbt_swag_t failed_actions =
 525      surf_network_model->states.failed_action_set;
 526    */
 527
 528   xbt_swag_foreach_safe(action, next_action, running_actions) {
 529     deltap = delta;
 530     if (action->latency > 0) {
 531       if (action->latency > deltap) {
 532         double_update(&(action->latency), deltap);
 533         deltap = 0.0;
 534       } else {
 535         double_update(&(deltap), action->latency);
 536         action->latency = 0.0;
 537       }
 538       if ((action->latency == 0.0) && !(action->suspended))
 539         lmm_update_variable_weight(network_im_maxmin_system, action->variable,
 540                                    action->weight);
 541     }
 542 #ifdef HAVE_TRACING
 543     if (TRACE_is_enabled()) {
 544       xbt_dynar_t route=NULL;
 545       routing_get_route_and_latency(action->src_name, action->dst_name,&route,NULL);
 546       link_CM02_im_t link;
 547       unsigned int i;
 548       xbt_dynar_foreach(route, i, link) {
 549         TRACE_surf_link_set_utilization(link->lmm_resource.generic_resource.name,
 550                                         action->generic_action.data,
 551                                         (surf_action_t) action,
 552                                         lmm_variable_getvalue
 553                                         (action->variable), now - delta,
 554                                         delta);
 555       }
 556     }
 557 #endif
 558     if(!lmm_get_number_of_cnst_from_var(network_im_maxmin_system, action->variable)) {
 559         /* There is actually no link used, hence an infinite bandwidth.
 560          * This happens often when using models like vivaldi.
 561          * In such case, just make sure that the action completes immediately.
 562          */
 563       double_update(&(action->generic_action.remains),
 564           action->generic_action.remains);
 565     }
 566     double_update(&(action->generic_action.remains),
 567                   lmm_variable_getvalue(action->variable) * deltap);
 568     if (action->generic_action.max_duration != NO_MAX_DURATION)
 569       double_update(&(action->generic_action.max_duration), delta);
 570
 571     if ((action->generic_action.remains <= 0) &&
 572         (lmm_get_variable_weight(action->variable) > 0)) {
 573       action->generic_action.finish = surf_get_clock();
 574       surf_network_model->action_state_set((surf_action_t) action,
 575                                            SURF_ACTION_DONE);
 576 #ifdef HAVE_SMPI
 577       gap_remove(action);
 578 #endif
 579     } else if ((action->generic_action.max_duration != NO_MAX_DURATION)
 580                && (action->generic_action.max_duration <= 0)) {
 581       action->generic_action.finish = surf_get_clock();
 582       surf_network_model->action_state_set((surf_action_t) action,
 583                                            SURF_ACTION_DONE);
 584 #ifdef HAVE_SMPI
 585       gap_remove(action);
 586 #endif
 587     }
 588   }
 589
 590   return;
 591 }
 592
 593 static void net_update_actions_state_lazy(double now, double delta)
 594 {
 595   surf_action_network_CM02_im_t action = NULL;
 596
 597   while ((xbt_heap_size(im_net_action_heap) > 0)
 598          && (double_equals(xbt_heap_maxkey(im_net_action_heap), now))) {
 599     action = xbt_heap_pop(im_net_action_heap);
 600     XBT_DEBUG("Action %p: finish", action);
 601     GENERIC_ACTION(action).finish = surf_get_clock();
 602
 603     // if I am wearing a latency heat
 604     if( action->hat ==  LATENCY){
 605         lmm_update_variable_weight(network_im_maxmin_system, action->variable,
 606                                            action->weight);
 607         heap_remove(action);
 608         action->last_update = surf_get_clock();
 609
 610         XBT_DEBUG("Action (%p) is not limited by latency anymore", action);
 611 #ifdef HAVE_LATENCY_BOUND_TRACKING
 612           GENERIC_ACTION(action).latency_limited = 0;
 613 #endif
 614
 615     // if I am wearing a max_duration or normal hat
 616     }else if( action->hat == MAX_DURATION || action->hat == NORMAL ){
 617         // no need to communicate anymore
 618         // assume that flows that reached max_duration have remaining of 0
 619         GENERIC_ACTION(action).remains = 0;
 620         action->generic_action.finish = surf_get_clock();
 621               surf_network_model->action_state_set((surf_action_t) action,
 622                                                    SURF_ACTION_DONE);
 623         heap_remove(action);
 624     }
 625   }
 626   return;
 627 }
 628
 629 static void net_update_resource_state(void *id,
 630                                       tmgr_trace_event_t event_type,
 631                                       double value, double date)
 632 {
 633   link_CM02_im_t nw_link = id;
 634   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 635   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 636   /*     value, event_type); */
 637
 638   if (event_type == nw_link->lmm_resource.power.event) {
 639     double delta =
 640         sg_weight_S_parameter / value - sg_weight_S_parameter /
 641         (nw_link->lmm_resource.power.peak *
 642          nw_link->lmm_resource.power.scale);
 643     lmm_variable_t var = NULL;
 644     lmm_element_t elem = NULL;
 645     surf_action_network_CM02_im_t action = NULL;
 646
 647     nw_link->lmm_resource.power.peak = value;
 648     lmm_update_constraint_bound(network_im_maxmin_system,
 649                                 nw_link->lmm_resource.constraint,
 650                                 sg_bandwidth_factor *
 651                                 (nw_link->lmm_resource.power.peak *
 652                                  nw_link->lmm_resource.power.scale));
 653 #ifdef HAVE_TRACING
 654     TRACE_surf_link_set_bandwidth(date, (char *)(((nw_link->lmm_resource).generic_resource).name),
 655                                   sg_bandwidth_factor *
 656                                   (nw_link->lmm_resource.power.peak *
 657                                    nw_link->lmm_resource.power.scale));
 658 #endif
 659     if (sg_weight_S_parameter > 0) {
 660       while ((var = lmm_get_var_from_cnst
 661               (network_im_maxmin_system, nw_link->lmm_resource.constraint,
 662                &elem))) {
 663         action = lmm_variable_id(var);
 664         action->weight += delta;
 665         if (!(action->suspended))
 666           lmm_update_variable_weight(network_im_maxmin_system,
 667                                      action->variable, action->weight);
 668       }
 669     }
 670     if (tmgr_trace_event_free(event_type))
 671       nw_link->lmm_resource.power.event = NULL;
 672   } else if (event_type == nw_link->lat_event) {
 673     double delta = value - nw_link->lat_current;
 674     lmm_variable_t var = NULL;
 675     lmm_element_t elem = NULL;
 676     surf_action_network_CM02_im_t action = NULL;
 677
 678     nw_link->lat_current = value;
 679     while ((var = lmm_get_var_from_cnst
 680             (network_im_maxmin_system, nw_link->lmm_resource.constraint,
 681              &elem))) {
 682       action = lmm_variable_id(var);
 683       action->lat_current += delta;
 684       action->weight += delta;
 685       if (action->rate < 0)
 686         lmm_update_variable_bound(network_im_maxmin_system, action->variable,
 687                                   sg_tcp_gamma / (2.0 *
 688                                                   action->lat_current));
 689       else {
 690         lmm_update_variable_bound(network_im_maxmin_system, action->variable,
 691                                   min(action->rate,
 692                                       sg_tcp_gamma / (2.0 *
 693                                                       action->lat_current)));
 694
 695         if (action->rate < sg_tcp_gamma / (2.0 * action->lat_current)) {
 696           XBT_INFO("Flow is limited BYBANDWIDTH");
 697         } else {
 698           XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 699                 action->lat_current);
 700         }
 701       }
 702       if (!(action->suspended))
 703         lmm_update_variable_weight(network_im_maxmin_system, action->variable,
 704                                    action->weight);
 705
 706     }
 707     if (tmgr_trace_event_free(event_type))
 708       nw_link->lat_event = NULL;
 709   } else if (event_type == nw_link->lmm_resource.state_event) {
 710     if (value > 0)
 711       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 712     else {
 713       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 714       lmm_variable_t var = NULL;
 715       lmm_element_t elem = NULL;
 716
 717       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 718       while ((var = lmm_get_var_from_cnst
 719               (network_im_maxmin_system, cnst, &elem))) {
 720         surf_action_t action = lmm_variable_id(var);
 721
 722         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 723             surf_action_state_get(action) == SURF_ACTION_READY) {
 724           action->finish = date;
 725           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 726         }
 727       }
 728     }
 729     if (tmgr_trace_event_free(event_type))
 730       nw_link->lmm_resource.state_event = NULL;
 731   } else {
 732     XBT_CRITICAL("Unknown event ! \n");
 733     xbt_abort();
 734   }
 735
 736   XBT_DEBUG("There were a resource state event, need to update actions related to the constraint (%p)", nw_link->lmm_resource.constraint);
 737   return;
 738 }
 739
 740
 741 static surf_action_t im_net_communicate(const char *src_name,
 742                                      const char *dst_name, double size,
 743                                      double rate)
 744 {
 745   unsigned int i;
 746   link_CM02_im_t link;
 747   int failed = 0;
 748   surf_action_network_CM02_im_t action = NULL;
 749   double bandwidth_bound;
 750   double latency=0.0;
 751   /* LARGE PLATFORMS HACK:
 752      Add a link_CM02_im_t *link and a int link_nb to network_card_CM02_im_t. It will represent local links for this node
 753      Use the cluster_id for ->id */
 754
 755   xbt_dynar_t back_route = NULL;
 756   int constraints_per_variable = 0;
 757   // I need to have the forward and backward routes at the same time, so allocate "route". That way, the routing wont clean it up
 758   xbt_dynar_t route=xbt_dynar_new(global_routing->size_of_link,NULL);
 759   routing_get_route_and_latency(src_name, dst_name, &route, &latency);
 760
 761   if (sg_network_crosstraffic == 1) {
 762     // FIXME: fill route directly (unclear: check with blame who put the FIXME)
 763     routing_get_route_and_latency(dst_name, src_name, &back_route,NULL);
 764   }
 765
 766   /* LARGE PLATFORMS HACK:
 767      total_route_size = route_size + src->link_nb + dst->nb */
 768
 769   XBT_IN("(%s,%s,%g,%g)", src_name, dst_name, size, rate);
 770   /* LARGE PLATFORMS HACK:
 771      assert on total_route_size */
 772   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 773               "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 774               src_name, dst_name);
 775
 776   xbt_dynar_foreach(route, i, link) {
 777     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 778       failed = 1;
 779       break;
 780     }
 781   }
 782   if (sg_network_crosstraffic == 1) {
 783     xbt_dynar_foreach(back_route, i, link) {
 784       if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 785         failed = 1;
 786         break;
 787       }
 788     }
 789   }
 790
 791   action =
 792       surf_action_new(sizeof(s_surf_action_network_CM02_im_t), size,
 793                       surf_network_model, failed);
 794 #ifdef HAVE_LATENCY_BOUND_TRACKING
 795   (action->generic_action).latency_limited = 0;
 796 #endif
 797   action->weight = action->latency = latency;
 798
 799   xbt_swag_insert(action, action->generic_action.state_set);
 800   action->rate = rate;
 801   if(network_update_mechanism == UM_LAZY){
 802     action->index_heap = -1;
 803     action->latency = 0.0;
 804     action->weight = 0.0;
 805     action->last_update = surf_get_clock();
 806   }
 807
 808   bandwidth_bound = -1.0;
 809   xbt_dynar_foreach(route, i, link) {
 810     action->weight +=
 811         sg_weight_S_parameter /
 812         (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 813     if (bandwidth_bound < 0.0)
 814       bandwidth_bound =
 815           im_bandwidth_factor_callback(size) *
 816           (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 817     else
 818       bandwidth_bound =
 819           min(bandwidth_bound,
 820               im_bandwidth_factor_callback(size) *
 821               (link->lmm_resource.power.peak *
 822                link->lmm_resource.power.scale));
 823   }
 824   /* LARGE PLATFORMS HACK:
 825      Add src->link and dst->link latencies */
 826   action->lat_current = action->latency;
 827   action->latency *= im_latency_factor_callback(size);
 828   action->rate =
 829       im_bandwidth_constraint_callback(action->rate, bandwidth_bound,
 830                                         size);
 831 #ifdef HAVE_SMPI
 832   if(!xbt_dynar_is_empty(route)) {
 833     link = *(link_CM02_im_t*)xbt_dynar_get_ptr(route, 0);
 834     gap_append(size, link, action);
 835     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 836            action, src_name, dst_name, action->sender.gap, action->latency);
 837   } else {
 838     gap_unknown(action);
 839   }
 840 #endif
 841
 842   /* LARGE PLATFORMS HACK:
 843      lmm_variable_new(..., total_route_size) */
 844   if (back_route != NULL) {
 845     constraints_per_variable =
 846         xbt_dynar_length(route) + xbt_dynar_length(back_route);
 847   } else {
 848     constraints_per_variable = xbt_dynar_length(route);
 849   }
 850
 851   if (action->latency > 0){
 852       action->variable =
 853         lmm_variable_new(network_im_maxmin_system, action, 0.0, -1.0,
 854                          constraints_per_variable);
 855     if(network_update_mechanism == UM_LAZY){
 856       // add to the heap the event when the latency is payed
 857       XBT_DEBUG("Added action (%p) one latency event at date %f", action, action->latency + action->last_update);
 858       heap_insert(action, action->latency + action->last_update, LATENCY);
 859     }
 860 #ifdef HAVE_LATENCY_BOUND_TRACKING
 861         (action->generic_action).latency_limited = 1;
 862 #endif
 863   }
 864   else
 865     action->variable =
 866         lmm_variable_new(network_im_maxmin_system, action, 1.0, -1.0,
 867                          constraints_per_variable);
 868
 869   if (action->rate < 0) {
 870     if (action->lat_current > 0)
 871       lmm_update_variable_bound(network_im_maxmin_system, action->variable,
 872                                 sg_tcp_gamma / (2.0 *
 873                                                 action->lat_current));
 874     else
 875       lmm_update_variable_bound(network_im_maxmin_system, action->variable,
 876                                 -1.0);
 877   } else {
 878     if (action->lat_current > 0)
 879       lmm_update_variable_bound(network_im_maxmin_system, action->variable,
 880                                 min(action->rate,
 881                                     sg_tcp_gamma / (2.0 *
 882                                                     action->lat_current)));
 883     else
 884       lmm_update_variable_bound(network_im_maxmin_system, action->variable,
 885                                 action->rate);
 886   }
 887
 888   xbt_dynar_foreach(route, i, link) {
 889     lmm_expand(network_im_maxmin_system, link->lmm_resource.constraint,
 890                action->variable, 1.0);
 891   }
 892
 893   if (sg_network_crosstraffic == 1) {
 894     XBT_DEBUG("Fullduplex active adding backward flow using 5%c", '%');
 895     xbt_dynar_foreach(back_route, i, link) {
 896       lmm_expand(network_im_maxmin_system, link->lmm_resource.constraint,
 897                  action->variable, .05);
 898     }
 899   }
 900
 901   /* LARGE PLATFORMS HACK:
 902      expand also with src->link and dst->link */
 903 #ifdef HAVE_TRACING
 904   if (TRACE_is_enabled()) {
 905     action->src_name = xbt_strdup(src_name);
 906     action->dst_name = xbt_strdup(dst_name);
 907   } else {
 908     action->src_name = action->dst_name = NULL;
 909   }
 910 #endif
 911
 912   xbt_dynar_free(&route);
 913   XBT_OUT();
 914
 915   return (surf_action_t) action;
 916 }
 917
 918 static xbt_dynar_t im_net_get_route(const char *src, const char *dst)
 919 {
 920   xbt_dynar_t route=NULL;
 921   routing_get_route_and_latency(src, dst,&route,NULL);
 922   return route;
 923 }
 924
 925 static double im_net_get_link_bandwidth(const void *link)
 926 {
 927   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 928   return lmm->power.peak * lmm->power.scale;
 929 }
 930
 931 static double im_net_get_link_latency(const void *link)
 932 {
 933   return ((link_CM02_im_t) link)->lat_current;
 934 }
 935
 936 static int im_net_link_shared(const void *link)
 937 {
 938   return
 939       lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 940 }
 941
 942 static void im_net_action_suspend(surf_action_t action)
 943 {
 944   ((surf_action_network_CM02_im_t) action)->suspended = 1;
 945   lmm_update_variable_weight(network_im_maxmin_system,
 946                              ((surf_action_network_CM02_im_t)
 947                               action)->variable, 0.0);
 948
 949   if(network_update_mechanism == UM_LAZY)// remove action from the heap
 950     heap_remove((surf_action_network_CM02_im_t) action);
 951 }
 952
 953 static void im_net_action_resume(surf_action_t action)
 954 {
 955   if (((surf_action_network_CM02_im_t) action)->suspended) {
 956     lmm_update_variable_weight(network_im_maxmin_system,
 957                                ((surf_action_network_CM02_im_t)
 958                                 action)->variable,
 959                                ((surf_action_network_CM02_im_t)
 960                                 action)->weight);
 961     ((surf_action_network_CM02_im_t) action)->suspended = 0;
 962     if(network_update_mechanism == UM_LAZY)// remove action from the heap
 963       heap_remove((surf_action_network_CM02_im_t) action);
 964   }
 965 }
 966
 967 static int im_net_action_is_suspended(surf_action_t action)
 968 {
 969   return ((surf_action_network_CM02_im_t) action)->suspended;
 970 }
 971
 972 void im_net_action_set_max_duration(surf_action_t action, double duration)
 973 {
 974   action->max_duration = duration;
 975   if(network_update_mechanism == UM_LAZY)// remove action from the heap
 976     heap_remove((surf_action_network_CM02_im_t) action);
 977 }
 978
 979 #ifdef HAVE_TRACING
 980 static void net_action_set_category(surf_action_t action, const char *category)
 981 {
 982   action->category = xbt_strdup (category);
 983 }
 984 #endif
 985
 986 static void im_net_finalize(void)
 987 {
 988   surf_model_exit(surf_network_model);
 989   surf_network_model = NULL;
 990
 991   lmm_system_free(network_im_maxmin_system);
 992   network_im_maxmin_system = NULL;
 993
 994   if(network_update_mechanism == UM_LAZY){
 995     xbt_heap_free(im_net_action_heap);
 996     xbt_swag_free(im_net_modified_set);
 997   }
 998 }
 999
1000 #ifdef HAVE_SMPI
1001 static void gap_append(double size, const link_CM02_im_t link, surf_action_network_CM02_im_t action) {
1002    const char* src = link->lmm_resource.generic_resource.name;
1003    xbt_fifo_t fifo;
1004    surf_action_network_CM02_im_t last_action;
1005    double bw;
1006
1007    if(sg_sender_gap > 0.0) {
1008       if(!gap_lookup) {
1009          gap_lookup = xbt_dict_new();
1010       }
1011       fifo = (xbt_fifo_t)xbt_dict_get_or_null(gap_lookup, src);
1012       action->sender.gap = 0.0;
1013       if(fifo && xbt_fifo_size(fifo) > 0) {
1014          /* Compute gap from last send */
1015          last_action = (surf_action_network_CM02_im_t)xbt_fifo_get_item_content(xbt_fifo_get_last_item(fifo));
1016          bw = im_net_get_link_bandwidth(link);
1017          action->sender.gap = last_action->sender.gap + max(sg_sender_gap, last_action->sender.size / bw);
1018          action->latency += action->sender.gap;
1019       }
1020       /* Append action as last send */
1021       action->sender.link_name = link->lmm_resource.generic_resource.name;
1022       fifo = (xbt_fifo_t)xbt_dict_get_or_null(gap_lookup, action->sender.link_name);
1023       if(!fifo) {
1024          fifo = xbt_fifo_new();
1025          xbt_dict_set(gap_lookup, action->sender.link_name, fifo, NULL);
1026       }
1027       action->sender.fifo_item = xbt_fifo_push(fifo, action);
1028       action->sender.size = size;
1029    }
1030 }
1031
1032 static void gap_unknown(surf_action_network_CM02_im_t action) {
1033    action->sender.gap = 0.0;
1034    action->sender.link_name = NULL;
1035    action->sender.fifo_item = NULL;
1036    action->sender.size = 0.0;
1037 }
1038
1039 static void gap_remove(surf_action_network_CM02_im_t action) {
1040    xbt_fifo_t fifo;
1041    size_t size;
1042
1043    if(sg_sender_gap > 0.0 && action->sender.link_name && action->sender.fifo_item) {
1044       fifo = (xbt_fifo_t)xbt_dict_get_or_null(gap_lookup, action->sender.link_name);
1045       xbt_fifo_remove_item(fifo, action->sender.fifo_item);
1046       size = xbt_fifo_size(fifo);
1047       if(size == 0) {
1048          xbt_fifo_free(fifo);
1049          xbt_dict_remove(gap_lookup, action->sender.link_name);
1050          size = xbt_dict_length(gap_lookup);
1051          if(size == 0) {
1052             xbt_dict_free(&gap_lookup);
1053          }
1054       }
1055    }
1056 }
1057 #endif
1058
1059 static void im_surf_network_model_init_internal(void)
1060 {
1061   s_surf_action_network_CM02_im_t comm;
1062
1063   surf_network_model = surf_model_init();
1064
1065   surf_network_model->name = "network";
1066   surf_network_model->action_unref = im_net_action_unref;
1067   surf_network_model->action_cancel = im_net_action_cancel;
1068   surf_network_model->action_recycle = im_net_action_recycle;
1069   surf_network_model->get_remains = im_net_action_get_remains;
1070 #ifdef HAVE_LATENCY_BOUND_TRACKING
1071   surf_network_model->get_latency_limited = im_net_get_link_latency_limited;
1072 #endif
1073
1074   surf_network_model->model_private->resource_used = im_net_resource_used;
1075   if(network_update_mechanism == UM_LAZY)
1076     surf_network_model->model_private->share_resources = net_share_resources_lazy;
1077   else if(network_update_mechanism == UM_FULL)
1078     surf_network_model->model_private->share_resources = net_share_resources_full;
1079
1080   if(network_update_mechanism == UM_LAZY)
1081     surf_network_model->model_private->update_actions_state =net_update_actions_state_lazy;
1082   else if(network_update_mechanism == UM_FULL)
1083     surf_network_model->model_private->update_actions_state =net_update_actions_state_full;
1084
1085   surf_network_model->model_private->update_resource_state =
1086                   net_update_resource_state;
1087   surf_network_model->model_private->finalize = im_net_finalize;
1088
1089   surf_network_model->suspend = im_net_action_suspend;
1090   surf_network_model->resume = im_net_action_resume;
1091   surf_network_model->is_suspended = im_net_action_is_suspended;
1092   surf_cpu_model->set_max_duration = im_net_action_set_max_duration;
1093
1094   surf_network_model->extension.network.communicate = im_net_communicate;
1095   surf_network_model->extension.network.get_route = im_net_get_route;
1096   surf_network_model->extension.network.get_link_bandwidth =
1097                   im_net_get_link_bandwidth;
1098   surf_network_model->extension.network.get_link_latency =
1099                   im_net_get_link_latency;
1100   surf_network_model->extension.network.link_shared = im_net_link_shared;
1101   surf_network_model->extension.network.add_traces = im_net_add_traces;
1102   surf_network_model->extension.network.create_resource =
1103                   im_net_create_resource;
1104
1105   if (!network_im_maxmin_system)
1106     network_im_maxmin_system = lmm_system_new();
1107
1108  routing_model_create(sizeof(link_CM02_im_t),
1109       im_net_create_resource("__loopback__",
1110           498000000, NULL, 0.000015, NULL,
1111           SURF_RESOURCE_ON, NULL,
1112           SURF_LINK_FATPIPE, NULL));
1113
1114   if(network_update_mechanism == UM_LAZY){
1115     sg_maxmin_selective_update = 1;
1116     im_net_action_heap = xbt_heap_new(8,NULL);
1117     xbt_heap_set_update_callback(im_net_action_heap, im_net_action_update_index_heap);
1118     im_net_modified_set =
1119         xbt_swag_new(xbt_swag_offset(comm, action_list_hookup));
1120   }
1121 }
1122
1123 static void set_update_mechanism(void) {
1124   char *optim = xbt_cfg_get_string(_surf_cfg_set, "network/optim");
1125
1126   if(!strcmp(optim,"Full")) {
1127     network_update_mechanism = UM_FULL;
1128   } else if (!strcmp(optim,"Lazy")) {
1129     network_update_mechanism = UM_LAZY;
1130   } else {
1131     xbt_die("Unsupported optimization (%s) for this model",optim);
1132   }
1133 }
1134
1135 /************************************************************************/
1136 /* New model based on LV08 and experimental results of MPI ping-pongs   */
1137 /************************************************************************/
1138 void surf_network_model_init_SMPI(void)
1139 {
1140
1141   if (surf_network_model)
1142     return;
1143   set_update_mechanism();
1144
1145   im_surf_network_model_init_internal();
1146   im_latency_factor_callback = &smpi_latency_factor;
1147   im_bandwidth_factor_callback = &smpi_bandwidth_factor;
1148   im_bandwidth_constraint_callback = &smpi_bandwidth_constraint;
1149   im_net_define_callbacks();
1150   xbt_dynar_push(model_list, &surf_network_model);
1151   network_im_solve = lmm_solve;
1152
1153   xbt_cfg_setdefault_double(_surf_cfg_set, "network/sender_gap", 10e-6);
1154   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
1155 }
1156
1157 /************************************************************************/
1158 /* New model based on optimizations discussed during this thesis        */
1159 /************************************************************************/
1160 void im_surf_network_model_init_LegrandVelho(void)
1161 {
1162   char *model = xbt_cfg_get_string(_surf_cfg_set, "network/model");
1163
1164   if (surf_network_model)
1165     return;
1166
1167   if(!strcmp(model,"LV08_fullupdate")) {
1168     XBT_WARN("[*Deprecated*. Use --cfg=network/model:LV08 with option --cfg=network/optim:Full instead.]");
1169   }
1170   set_update_mechanism();
1171
1172   im_surf_network_model_init_internal();
1173   im_net_define_callbacks();
1174   xbt_dynar_push(model_list, &surf_network_model);
1175   network_im_solve = lmm_solve;
1176
1177   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4); // 13.01 when callibration is done without phase effects
1178   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",0.92);// 0.97 when callibration is done without phase effects
1179   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);       // 20537 when callibration is done without phase effects
1180 }
1181
1182 /***************************************************************************/
1183 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
1184 /***************************************************************************/
1185 /* @TechReport{      rr-lip2002-40, */
1186 /*   author        = {Henri Casanova and Loris Marchal}, */
1187 /*   institution   = {LIP}, */
1188 /*   title         = {A Network Model for Simulation of Grid Application}, */
1189 /*   number        = {2002-40}, */
1190 /*   month         = {oct}, */
1191 /*   year          = {2002} */
1192 /* } */
1193 void surf_network_model_init_CM02(void)
1194 {
1195
1196   if (surf_network_model)
1197     return;
1198
1199   set_update_mechanism();
1200   im_surf_network_model_init_internal();
1201   im_net_define_callbacks();
1202   xbt_dynar_push(model_list, &surf_network_model);
1203   network_im_solve = lmm_solve;
1204
1205   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 1.0);
1206   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor", 1.0);
1207   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 0.0);
1208 }
1209
1210 void surf_network_model_init_Reno(void)
1211 {
1212   if (surf_network_model)
1213     return;
1214
1215   set_update_mechanism();
1216   im_surf_network_model_init_internal();
1217   im_net_define_callbacks();
1218
1219   xbt_dynar_push(model_list, &surf_network_model);
1220   lmm_set_default_protocol_function(func_reno_f, func_reno_fp,
1221                                     func_reno_fpi);
1222   network_im_solve = lagrange_solve;
1223
1224   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
1225   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
1226                             0.92);
1227   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
1228 }
1229
1230
1231 void surf_network_model_init_Reno2(void)
1232 {
1233   if (surf_network_model)
1234     return;
1235
1236   set_update_mechanism();
1237   im_surf_network_model_init_internal();
1238   im_net_define_callbacks();
1239
1240   xbt_dynar_push(model_list, &surf_network_model);
1241   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
1242                                     func_reno2_fpi);
1243   network_im_solve = lagrange_solve;
1244
1245   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
1246   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
1247                             0.92);
1248   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S_parameter",
1249                             8775);
1250 }
1251
1252 void surf_network_model_init_Vegas(void)
1253 {
1254   if (surf_network_model)
1255     return;
1256
1257   set_update_mechanism();
1258   im_surf_network_model_init_internal();
1259   im_net_define_callbacks();
1260
1261   xbt_dynar_push(model_list, &surf_network_model);
1262   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
1263                                     func_vegas_fpi);
1264   network_im_solve = lagrange_solve;
1265
1266   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
1267   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
1268                             0.92);
1269   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
1270 }