src/surf/network.c

   1 /*      $Id$     */
   2
   3 /* Copyright (c) 2004 Arnaud Legrand. All rights reserved.                  */
   4
   5 /* This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the license (GNU LGPL) which comes with this package. */
   7
   8 #include "network_private.h"
   9 #include "xbt/log.h"
  10 #include "xbt/str.h"
  11
  12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_network, surf,
  13                                 "Logging specific to the SURF network module");
  14
  15 surf_model_t surf_network_model = NULL;
  16 static lmm_system_t network_maxmin_system = NULL;
  17 static void (*network_solve) (lmm_system_t) = NULL;
  18
  19 double latency_factor = 1.0;    /* default value */
  20 double bandwidth_factor = 1.0;  /* default value */
  21 double weight_S_parameter = 0.0;        /* default value */
  22
  23 double sg_tcp_gamma = 0.0;
  24
  25
  26 static link_CM02_t net_link_new(char *name,
  27                             double bw_initial,
  28                             tmgr_trace_t bw_trace,
  29                             double lat_initial,
  30                             tmgr_trace_t lat_trace,
  31                             e_surf_resource_state_t
  32                             state_initial,
  33                             tmgr_trace_t state_trace,
  34                             e_surf_link_sharing_policy_t
  35                             policy, xbt_dict_t properties)
  36 {
  37   link_CM02_t nw_link = (link_CM02_t)
  38     surf_resource_lmm_new(sizeof(s_link_CM02_t),
  39                           surf_network_model, name, properties,
  40                           network_maxmin_system,
  41                           bandwidth_factor * bw_initial,
  42                           history,
  43                           state_initial, state_trace,
  44                           bw_initial, bw_trace);
  45
  46   xbt_assert1(!xbt_dict_get_or_null(surf_network_model->resource_set, name),
  47               "Link '%s' declared several times in the platform file.", name);
  48
  49   nw_link->lat_current = lat_initial;
  50   if (lat_trace)
  51     nw_link->lat_event =
  52       tmgr_history_add_trace(history, lat_trace, 0.0, 0, nw_link);
  53
  54   if (policy == SURF_LINK_FATPIPE)
  55     lmm_constraint_shared(nw_link->lmm_resource.constraint);
  56
  57   xbt_dict_set(surf_network_model->resource_set, name, nw_link,
  58                surf_resource_free);
  59
  60   return nw_link;
  61 }
  62
  63 static void net_parse_link_init(void)
  64 {
  65   char *name_link;
  66   double bw_initial;
  67   tmgr_trace_t bw_trace;
  68   double lat_initial;
  69   tmgr_trace_t lat_trace;
  70   e_surf_resource_state_t state_initial_link = SURF_RESOURCE_ON;
  71   e_surf_link_sharing_policy_t policy_initial_link = SURF_LINK_SHARED;
  72   tmgr_trace_t state_trace;
  73
  74   name_link = xbt_strdup(A_surfxml_link_id);
  75   surf_parse_get_double(&bw_initial, A_surfxml_link_bandwidth);
  76   bw_trace = tmgr_trace_new(A_surfxml_link_bandwidth_file);
  77   surf_parse_get_double(&lat_initial, A_surfxml_link_latency);
  78   lat_trace = tmgr_trace_new(A_surfxml_link_latency_file);
  79
  80   xbt_assert0((A_surfxml_link_state == A_surfxml_link_state_ON)
  81               || (A_surfxml_link_state ==
  82                   A_surfxml_link_state_OFF), "Invalid state");
  83   if (A_surfxml_link_state == A_surfxml_link_state_ON)
  84     state_initial_link = SURF_RESOURCE_ON;
  85   else if (A_surfxml_link_state == A_surfxml_link_state_OFF)
  86     state_initial_link = SURF_RESOURCE_OFF;
  87
  88   if (A_surfxml_link_sharing_policy == A_surfxml_link_sharing_policy_SHARED)
  89     policy_initial_link = SURF_LINK_SHARED;
  90   else if (A_surfxml_link_sharing_policy ==
  91            A_surfxml_link_sharing_policy_FATPIPE)
  92     policy_initial_link = SURF_LINK_FATPIPE;
  93
  94   state_trace = tmgr_trace_new(A_surfxml_link_state_file);
  95
  96   net_link_new(name_link, bw_initial, bw_trace,
  97            lat_initial, lat_trace, state_initial_link, state_trace,
  98            policy_initial_link, xbt_dict_new());
  99
 100 }
 101
 102 static void net_add_traces(void)
 103 {
 104   xbt_dict_cursor_t cursor = NULL;
 105   char *trace_name, *elm;
 106
 107   static int called = 0;
 108   if (called)
 109     return;
 110   called = 1;
 111
 112   /* connect all traces relative to network */
 113   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 114     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 115     link_CM02_t link =
 116       xbt_dict_get_or_null(surf_network_model->resource_set, elm);
 117
 118     xbt_assert2(link, "Cannot connect trace %s to link %s: link undefined",
 119                 trace_name, elm);
 120     xbt_assert2(trace, "Cannot connect trace %s to link %s: trace undefined",
 121                 trace_name, elm);
 122
 123     link->lmm_resource.state_event =
 124       tmgr_history_add_trace(history, trace, 0.0, 0, link);
 125   }
 126
 127   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 128     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 129     link_CM02_t link =
 130       xbt_dict_get_or_null(surf_network_model->resource_set, elm);
 131
 132     xbt_assert2(link, "Cannot connect trace %s to link %s: link undefined",
 133                 trace_name, elm);
 134     xbt_assert2(trace, "Cannot connect trace %s to link %s: trace undefined",
 135                 trace_name, elm);
 136
 137     link->lmm_resource.power.event =
 138       tmgr_history_add_trace(history, trace, 0.0, 0, link);
 139   }
 140
 141   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 142     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 143     link_CM02_t link =
 144       xbt_dict_get_or_null(surf_network_model->resource_set, elm);
 145
 146     xbt_assert2(link, "Cannot connect trace %s to link %s: link undefined",
 147                 trace_name, elm);
 148     xbt_assert2(trace, "Cannot connect trace %s to link %s: trace undefined",
 149                 trace_name, elm);
 150
 151     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 152   }
 153 }
 154
 155 static void net_define_callbacks(const char *file)
 156 {
 157   /* Figuring out the network links */
 158   surfxml_add_callback(STag_surfxml_link_cb_list, &net_parse_link_init);
 159   surfxml_add_callback(ETag_surfxml_platform_cb_list, &net_add_traces);
 160 }
 161
 162 static int net_resource_used(void *resource_id)
 163 {
 164   return lmm_constraint_used(network_maxmin_system,
 165                              ((surf_resource_lmm_t) resource_id)->constraint);
 166 }
 167
 168 static int net_action_unref(surf_action_t action)
 169 {
 170   action->refcount--;
 171   if (!action->refcount) {
 172     xbt_swag_remove(action, action->state_set);
 173     if (((surf_action_network_CM02_t) action)->variable)
 174       lmm_variable_free(network_maxmin_system,
 175                         ((surf_action_network_CM02_t) action)->variable);
 176     free(action);
 177     return 1;
 178   }
 179   return 0;
 180 }
 181
 182 static void net_action_cancel(surf_action_t action)
 183 {
 184   surf_network_model->action_state_set((surf_action_t) action,
 185                                        SURF_ACTION_FAILED);
 186   return;
 187 }
 188
 189 static void net_action_recycle(surf_action_t action)
 190 {
 191   return;
 192 }
 193
 194 static double net_action_get_remains(surf_action_t action)
 195 {
 196   return action->remains;
 197 }
 198
 199 static double net_share_resources(double now)
 200 {
 201   s_surf_action_network_CM02_t s_action;
 202   surf_action_network_CM02_t action = NULL;
 203   xbt_swag_t running_actions = surf_network_model->states.running_action_set;
 204   double min;
 205
 206   min = generic_maxmin_share_resources(running_actions,
 207                                        xbt_swag_offset(s_action,
 208                                                        variable),
 209                                        network_maxmin_system, network_solve);
 210
 211 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 212
 213   xbt_swag_foreach(action, running_actions) {
 214     if (action->latency > 0) {
 215       if (min < 0)
 216         min = action->latency;
 217       else if (action->latency < min)
 218         min = action->latency;
 219     }
 220   }
 221
 222   return min;
 223 }
 224
 225 static void net_update_actions_state(double now, double delta)
 226 {
 227   double deltap = 0.0;
 228   surf_action_network_CM02_t action = NULL;
 229   surf_action_network_CM02_t next_action = NULL;
 230   xbt_swag_t running_actions = surf_network_model->states.running_action_set;
 231   /*
 232      xbt_swag_t failed_actions =
 233      surf_network_model->states.failed_action_set;
 234    */
 235
 236   xbt_swag_foreach_safe(action, next_action, running_actions) {
 237     deltap = delta;
 238     if (action->latency > 0) {
 239       if (action->latency > deltap) {
 240         double_update(&(action->latency), deltap);
 241         deltap = 0.0;
 242       } else {
 243         double_update(&(deltap), action->latency);
 244         action->latency = 0.0;
 245       }
 246       if ((action->latency == 0.0) && !(action->suspended))
 247         lmm_update_variable_weight(network_maxmin_system, action->variable,
 248                                    action->weight);
 249     }
 250     double_update(&(action->generic_action.remains),
 251                   lmm_variable_getvalue(action->variable) * deltap);
 252     if (action->generic_action.max_duration != NO_MAX_DURATION)
 253       double_update(&(action->generic_action.max_duration), delta);
 254
 255     if ((action->generic_action.remains <= 0) &&
 256         (lmm_get_variable_weight(action->variable) > 0)) {
 257       action->generic_action.finish = surf_get_clock();
 258       surf_network_model->action_state_set((surf_action_t) action,
 259                                            SURF_ACTION_DONE);
 260     } else if ((action->generic_action.max_duration != NO_MAX_DURATION)
 261                && (action->generic_action.max_duration <= 0)) {
 262       action->generic_action.finish = surf_get_clock();
 263       surf_network_model->action_state_set((surf_action_t) action,
 264                                            SURF_ACTION_DONE);
 265     }
 266   }
 267
 268   return;
 269 }
 270
 271 static void net_update_resource_state(void *id,
 272                                   tmgr_trace_event_t event_type,
 273                                   double value, double date)
 274 {
 275   link_CM02_t nw_link = id;
 276   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 277   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 278   /*     value, event_type); */
 279
 280   if (event_type == nw_link->lmm_resource.power.event) {
 281     double delta =
 282       weight_S_parameter / value - weight_S_parameter /
 283       (nw_link->lmm_resource.power.peak * nw_link->lmm_resource.power.scale);
 284     lmm_variable_t var = NULL;
 285     lmm_element_t elem = NULL;
 286     surf_action_network_CM02_t action = NULL;
 287
 288     nw_link->lmm_resource.power.peak = value;
 289     lmm_update_constraint_bound(network_maxmin_system,
 290                                 nw_link->lmm_resource.constraint,
 291                                 bandwidth_factor *
 292                                 (nw_link->lmm_resource.power.peak *
 293                                  nw_link->lmm_resource.power.scale));
 294     if (weight_S_parameter > 0) {
 295       while ((var = lmm_get_var_from_cnst
 296               (network_maxmin_system, nw_link->lmm_resource.constraint,
 297                &elem))) {
 298         action = lmm_variable_id(var);
 299         action->weight += delta;
 300         if (!(action->suspended))
 301           lmm_update_variable_weight(network_maxmin_system, action->variable,
 302                                      action->weight);
 303       }
 304     }
 305     if (tmgr_trace_event_free(event_type))
 306       nw_link->lmm_resource.power.event = NULL;
 307   } else if (event_type == nw_link->lat_event) {
 308     double delta = value - nw_link->lat_current;
 309     lmm_variable_t var = NULL;
 310     lmm_element_t elem = NULL;
 311     surf_action_network_CM02_t action = NULL;
 312
 313     nw_link->lat_current = value;
 314     while ((var = lmm_get_var_from_cnst
 315             (network_maxmin_system, nw_link->lmm_resource.constraint,
 316              &elem))) {
 317       action = lmm_variable_id(var);
 318       action->lat_current += delta;
 319       action->weight += delta;
 320       if (action->rate < 0)
 321         lmm_update_variable_bound(network_maxmin_system, action->variable,
 322                                   sg_tcp_gamma / (2.0 * action->lat_current));
 323       else
 324         lmm_update_variable_bound(network_maxmin_system, action->variable,
 325                                   min(action->rate,
 326                                       sg_tcp_gamma / (2.0 *
 327                                                       action->lat_current)));
 328       if (!(action->suspended))
 329         lmm_update_variable_weight(network_maxmin_system, action->variable,
 330                                    action->weight);
 331
 332     }
 333     if (tmgr_trace_event_free(event_type))
 334       nw_link->lat_event = NULL;
 335   } else if (event_type == nw_link->lmm_resource.state_event) {
 336     if (value > 0)
 337       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 338     else {
 339       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 340       lmm_variable_t var = NULL;
 341       lmm_element_t elem = NULL;
 342
 343       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 344       while ((var = lmm_get_var_from_cnst
 345               (network_maxmin_system, cnst, &elem))) {
 346         surf_action_t action = lmm_variable_id(var);
 347
 348         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 349             surf_action_state_get(action) == SURF_ACTION_READY) {
 350           action->finish = date;
 351           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 352         }
 353       }
 354     }
 355     if (tmgr_trace_event_free(event_type))
 356       nw_link->lmm_resource.state_event = NULL;
 357   } else {
 358     CRITICAL0("Unknown event ! \n");
 359     xbt_abort();
 360   }
 361
 362   return;
 363 }
 364
 365 static surf_action_t net_communicate(const char *src_name, const char *dst_name,
 366                                  int src, int dst, double size, double rate)
 367 {
 368   surf_action_network_CM02_t action = NULL;
 369   /* LARGE PLATFORMS HACK:
 370      Add a link_CM02_t *link and a int link_nb to network_card_CM02_t. It will represent local links for this node
 371      Use the cluster_id for ->id */
 372   xbt_dynar_t route = used_routing->get_route(src, dst);
 373   /* LARGE PLATFORMS HACK:
 374      total_route_size = route_size + src->link_nb + dst->nb */
 375   unsigned int i;
 376
 377   XBT_IN4("(%s,%s,%g,%g)", src_name, dst_name, size, rate);
 378   /* LARGE PLATFORMS HACK:
 379      assert on total_route_size */
 380   xbt_assert2(xbt_dynar_length(route),
 381               "You're trying to send data from %s to %s but there is no connection between these two hosts.",
 382               src_name, dst_name);
 383
 384   link_CM02_t link;
 385   int failed = 0;
 386   xbt_dynar_foreach(route, i, link) {
 387     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 388       failed = 1;
 389       break;
 390     }
 391   }
 392   action =
 393     surf_action_new(sizeof(s_surf_action_network_CM02_t), size,
 394                     surf_network_model, failed);
 395
 396   xbt_swag_insert(action, action->generic_action.state_set);
 397   action->rate = rate;
 398
 399   action->latency = 0.0;
 400   action->weight = 0.0;
 401   xbt_dynar_foreach(route, i, link) {
 402     action->latency += link->lat_current;
 403     action->weight +=
 404       link->lat_current +
 405       weight_S_parameter /
 406       (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 407   }
 408   /* LARGE PLATFORMS HACK:
 409      Add src->link and dst->link latencies */
 410   action->lat_current = action->latency;
 411   action->latency *= latency_factor;
 412
 413   /* LARGE PLATFORMS HACK:
 414      lmm_variable_new(..., total_route_size) */
 415   if (action->latency > 0)
 416     action->variable =
 417       lmm_variable_new(network_maxmin_system, action, 0.0, -1.0,
 418                        xbt_dynar_length(route));
 419   else
 420     action->variable =
 421       lmm_variable_new(network_maxmin_system, action, 1.0, -1.0,
 422                        xbt_dynar_length(route));
 423
 424   if (action->rate < 0) {
 425     if (action->lat_current > 0)
 426       lmm_update_variable_bound(network_maxmin_system, action->variable,
 427                                 sg_tcp_gamma / (2.0 * action->lat_current));
 428     else
 429       lmm_update_variable_bound(network_maxmin_system, action->variable,
 430                                 -1.0);
 431   } else {
 432     if (action->lat_current > 0)
 433       lmm_update_variable_bound(network_maxmin_system, action->variable,
 434                                 min(action->rate,
 435                                     sg_tcp_gamma / (2.0 *
 436                                                     action->lat_current)));
 437     else
 438       lmm_update_variable_bound(network_maxmin_system, action->variable,
 439                                 action->rate);
 440   }
 441
 442   xbt_dynar_foreach(route, i, link) {
 443     lmm_expand(network_maxmin_system, link->lmm_resource.constraint,
 444                action->variable, 1.0);
 445   }
 446   /* LARGE PLATFORMS HACK:
 447      expand also with src->link and dst->link */
 448
 449   XBT_OUT;
 450
 451   return (surf_action_t) action;
 452 }
 453
 454 static double net_get_link_bandwidth(const void *link)
 455 {
 456   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 457   return lmm->power.peak * lmm->power.scale;
 458 }
 459
 460 static double net_get_link_latency(const void *link)
 461 {
 462   return ((link_CM02_t) link)->lat_current;
 463 }
 464
 465 static int net_link_shared(const void *link)
 466 {
 467   return lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 468 }
 469
 470 static void net_action_suspend(surf_action_t action)
 471 {
 472   ((surf_action_network_CM02_t) action)->suspended = 1;
 473   lmm_update_variable_weight(network_maxmin_system,
 474                              ((surf_action_network_CM02_t) action)->variable,
 475                              0.0);
 476 }
 477
 478 static void net_action_resume(surf_action_t action)
 479 {
 480   if (((surf_action_network_CM02_t) action)->suspended) {
 481     lmm_update_variable_weight(network_maxmin_system,
 482                                ((surf_action_network_CM02_t)
 483                                 action)->variable,
 484                                ((surf_action_network_CM02_t) action)->weight);
 485     ((surf_action_network_CM02_t) action)->suspended = 0;
 486   }
 487 }
 488
 489 static int net_action_is_suspended(surf_action_t action)
 490 {
 491   return ((surf_action_network_CM02_t) action)->suspended;
 492 }
 493
 494 static void net_action_set_max_duration(surf_action_t action, double duration)
 495 {
 496   action->max_duration = duration;
 497 }
 498
 499 static void net_finalize(void)
 500 {
 501   surf_model_exit(surf_network_model);
 502   surf_network_model = NULL;
 503
 504   used_routing->finalize();
 505   lmm_system_free(network_maxmin_system);
 506   network_maxmin_system = NULL;
 507 }
 508
 509 static void surf_network_model_init_internal(void)
 510 {
 511   surf_network_model = surf_model_init();
 512
 513   surf_network_model->name = "network";
 514   surf_network_model->action_unref = net_action_unref;
 515   surf_network_model->action_cancel = net_action_cancel;
 516   surf_network_model->action_recycle = net_action_recycle;
 517   surf_network_model->get_remains = net_action_get_remains;
 518
 519   surf_network_model->model_private->resource_used = net_resource_used;
 520   surf_network_model->model_private->share_resources = net_share_resources;
 521   surf_network_model->model_private->update_actions_state =
 522     net_update_actions_state;
 523   surf_network_model->model_private->update_resource_state =
 524     net_update_resource_state;
 525   surf_network_model->model_private->finalize = net_finalize;
 526
 527   surf_network_model->suspend = net_action_suspend;
 528   surf_network_model->resume = net_action_resume;
 529   surf_network_model->is_suspended = net_action_is_suspended;
 530   surf_cpu_model->set_max_duration = net_action_set_max_duration;
 531
 532   surf_network_model->extension.network.communicate = net_communicate;
 533   surf_network_model->extension.network.get_link_bandwidth =
 534     net_get_link_bandwidth;
 535   surf_network_model->extension.network.get_link_latency = net_get_link_latency;
 536   surf_network_model->extension.network.link_shared = net_link_shared;
 537
 538   if (!network_maxmin_system)
 539     network_maxmin_system = lmm_system_new();
 540
 541   routing_model_create(sizeof(link_CM02_t),
 542                        net_link_new(xbt_strdup("__loopback__"),
 543                                 498000000, NULL, 0.000015, NULL,
 544                                 SURF_RESOURCE_ON, NULL, SURF_LINK_FATPIPE,
 545                                 NULL));
 546 }
 547
 548 /************************************************************************/
 549 /* New model based on optimizations discussed during this thesis        */
 550 /************************************************************************/
 551 void surf_network_model_init_LegrandVelho(const char *filename)
 552 {
 553
 554   if (surf_network_model)
 555     return;
 556   surf_network_model_init_internal();
 557   net_define_callbacks(filename);
 558   xbt_dynar_push(model_list, &surf_network_model);
 559   network_solve = lmm_solve;
 560
 561   latency_factor = 10.4;
 562   bandwidth_factor = 0.92;
 563   weight_S_parameter = 8775;
 564
 565   update_model_description(surf_network_model_description,
 566                            "LV08", surf_network_model);
 567 }
 568
 569 /***************************************************************************/
 570 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 571 /***************************************************************************/
 572 /* @TechReport{      rr-lip2002-40, */
 573 /*   author        = {Henri Casanova and Loris Marchal}, */
 574 /*   institution   = {LIP}, */
 575 /*   title         = {A Network Model for Simulation of Grid Application}, */
 576 /*   number        = {2002-40}, */
 577 /*   month         = {oct}, */
 578 /*   year          = {2002} */
 579 /* } */
 580 void surf_network_model_init_CM02(const char *filename)
 581 {
 582
 583   if (surf_network_model)
 584     return;
 585   surf_network_model_init_internal();
 586   net_define_callbacks(filename);
 587   xbt_dynar_push(model_list, &surf_network_model);
 588   network_solve = lmm_solve;
 589
 590   update_model_description(surf_network_model_description,
 591                            "CM02", surf_network_model);
 592 }
 593
 594 void surf_network_model_init_Reno(const char *filename)
 595 {
 596   if (surf_network_model)
 597     return;
 598   surf_network_model_init_internal();
 599   net_define_callbacks(filename);
 600
 601   xbt_dynar_push(model_list, &surf_network_model);
 602   lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
 603   network_solve = lagrange_solve;
 604
 605   latency_factor = 10.4;
 606   bandwidth_factor = 0.92;
 607   weight_S_parameter = 8775;
 608
 609   update_model_description(surf_network_model_description,
 610                            "Reno", surf_network_model);
 611 }
 612
 613
 614 void surf_network_model_init_Reno2(const char *filename)
 615 {
 616   if (surf_network_model)
 617     return;
 618   surf_network_model_init_internal();
 619   net_define_callbacks(filename);
 620
 621   xbt_dynar_push(model_list, &surf_network_model);
 622   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 623                                     func_reno2_fpi);
 624   network_solve = lagrange_solve;
 625
 626   latency_factor = 10.4;
 627   bandwidth_factor = 0.92;
 628   weight_S_parameter = 8775;
 629
 630   update_model_description(surf_network_model_description,
 631                            "Reno2", surf_network_model);
 632 }
 633
 634 void surf_network_model_init_Vegas(const char *filename)
 635 {
 636   if (surf_network_model)
 637     return;
 638   surf_network_model_init_internal();
 639   net_define_callbacks(filename);
 640
 641   xbt_dynar_push(model_list, &surf_network_model);
 642   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 643                                     func_vegas_fpi);
 644   network_solve = lagrange_solve;
 645
 646   latency_factor = 10.4;
 647   bandwidth_factor = 0.92;
 648   weight_S_parameter = 8775;
 649
 650   update_model_description(surf_network_model_description,
 651                            "Vegas", surf_network_model);
 652 }