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 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 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   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 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 define_callbacks(const char *file)
 156 {
 157   /* Figuring out the network links */
 158   surfxml_add_callback(STag_surfxml_link_cb_list, &parse_link_init);
 159   surfxml_add_callback(ETag_surfxml_platform_cb_list, &add_traces);
 160 }
 161
 162 static int 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 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 action_cancel(surf_action_t action)
 183 {
 184   return;
 185 }
 186
 187 static void action_recycle(surf_action_t action)
 188 {
 189   return;
 190 }
 191
 192 static double action_get_remains(surf_action_t action)
 193 {
 194   return action->remains;
 195 }
 196
 197 static double share_resources(double now)
 198 {
 199   s_surf_action_network_CM02_t s_action;
 200   surf_action_network_CM02_t action = NULL;
 201   xbt_swag_t running_actions = surf_network_model->states.running_action_set;
 202   double min;
 203
 204   min = generic_maxmin_share_resources(running_actions,
 205                                        xbt_swag_offset(s_action,
 206                                                        variable),
 207                                        network_maxmin_system, network_solve);
 208
 209 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 210
 211   xbt_swag_foreach(action, running_actions) {
 212     if (action->latency > 0) {
 213       if (min < 0)
 214         min = action->latency;
 215       else if (action->latency < min)
 216         min = action->latency;
 217     }
 218   }
 219
 220   return min;
 221 }
 222
 223 static void update_actions_state(double now, double delta)
 224 {
 225   double deltap = 0.0;
 226   surf_action_network_CM02_t action = NULL;
 227   surf_action_network_CM02_t next_action = NULL;
 228   xbt_swag_t running_actions = surf_network_model->states.running_action_set;
 229   /*
 230      xbt_swag_t failed_actions =
 231      surf_network_model->states.failed_action_set;
 232    */
 233
 234   xbt_swag_foreach_safe(action, next_action, running_actions) {
 235     deltap = delta;
 236     if (action->latency > 0) {
 237       if (action->latency > deltap) {
 238         double_update(&(action->latency), deltap);
 239         deltap = 0.0;
 240       } else {
 241         double_update(&(deltap), action->latency);
 242         action->latency = 0.0;
 243       }
 244       if ((action->latency == 0.0) && !(action->suspended))
 245         lmm_update_variable_weight(network_maxmin_system, action->variable,
 246                                    action->weight);
 247     }
 248     double_update(&(action->generic_action.remains),
 249                   lmm_variable_getvalue(action->variable) * deltap);
 250     if (action->generic_action.max_duration != NO_MAX_DURATION)
 251       double_update(&(action->generic_action.max_duration), delta);
 252
 253     if ((action->generic_action.remains <= 0) &&
 254         (lmm_get_variable_weight(action->variable) > 0)) {
 255       action->generic_action.finish = surf_get_clock();
 256       surf_network_model->action_state_set((surf_action_t) action,
 257                                            SURF_ACTION_DONE);
 258     } else if ((action->generic_action.max_duration != NO_MAX_DURATION)
 259                && (action->generic_action.max_duration <= 0)) {
 260       action->generic_action.finish = surf_get_clock();
 261       surf_network_model->action_state_set((surf_action_t) action,
 262                                            SURF_ACTION_DONE);
 263     }
 264   }
 265
 266   return;
 267 }
 268
 269 static void update_resource_state(void *id,
 270                                   tmgr_trace_event_t event_type,
 271                                   double value, double date)
 272 {
 273   link_CM02_t nw_link = id;
 274   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 275   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 276   /*     value, event_type); */
 277
 278   if (event_type == nw_link->lmm_resource.power.event) {
 279     double delta =
 280       weight_S_parameter / value - weight_S_parameter /
 281       (nw_link->lmm_resource.power.peak * nw_link->lmm_resource.power.scale);
 282     lmm_variable_t var = NULL;
 283     lmm_element_t elem = NULL;
 284     surf_action_network_CM02_t action = NULL;
 285
 286     nw_link->lmm_resource.power.peak = value;
 287     lmm_update_constraint_bound(network_maxmin_system,
 288                                 nw_link->lmm_resource.constraint,
 289                                 bandwidth_factor *
 290                                 (nw_link->lmm_resource.power.peak *
 291                                  nw_link->lmm_resource.power.scale));
 292     if (weight_S_parameter > 0) {
 293       while ((var = lmm_get_var_from_cnst
 294               (network_maxmin_system, nw_link->lmm_resource.constraint,
 295                &elem))) {
 296         action = lmm_variable_id(var);
 297         action->weight += delta;
 298         if (!(action->suspended))
 299           lmm_update_variable_weight(network_maxmin_system, action->variable,
 300                                      action->weight);
 301       }
 302     }
 303     if (tmgr_trace_event_free(event_type))
 304       nw_link->lmm_resource.power.event = NULL;
 305   } else if (event_type == nw_link->lat_event) {
 306     double delta = value - nw_link->lat_current;
 307     lmm_variable_t var = NULL;
 308     lmm_element_t elem = NULL;
 309     surf_action_network_CM02_t action = NULL;
 310
 311     nw_link->lat_current = value;
 312     while ((var = lmm_get_var_from_cnst
 313             (network_maxmin_system, nw_link->lmm_resource.constraint,
 314              &elem))) {
 315       action = lmm_variable_id(var);
 316       action->lat_current += delta;
 317       action->weight += delta;
 318       if (action->rate < 0)
 319         lmm_update_variable_bound(network_maxmin_system, action->variable,
 320                                   sg_tcp_gamma / (2.0 * action->lat_current));
 321       else
 322         lmm_update_variable_bound(network_maxmin_system, action->variable,
 323                                   min(action->rate,
 324                                       sg_tcp_gamma / (2.0 *
 325                                                       action->lat_current)));
 326       if (!(action->suspended))
 327         lmm_update_variable_weight(network_maxmin_system, action->variable,
 328                                    action->weight);
 329
 330     }
 331     if (tmgr_trace_event_free(event_type))
 332       nw_link->lat_event = NULL;
 333   } else if (event_type == nw_link->lmm_resource.state_event) {
 334     if (value > 0)
 335       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 336     else {
 337       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 338       lmm_variable_t var = NULL;
 339       lmm_element_t elem = NULL;
 340
 341       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 342       while ((var = lmm_get_var_from_cnst
 343               (network_maxmin_system, cnst, &elem))) {
 344         surf_action_t action = lmm_variable_id(var);
 345
 346         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 347             surf_action_state_get(action) == SURF_ACTION_READY) {
 348           action->finish = date;
 349           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 350         }
 351       }
 352     }
 353     if (tmgr_trace_event_free(event_type))
 354       nw_link->lmm_resource.state_event = NULL;
 355   } else {
 356     CRITICAL0("Unknown event ! \n");
 357     xbt_abort();
 358   }
 359
 360   return;
 361 }
 362
 363 static surf_action_t communicate(const char *src_name, const char *dst_name,
 364                                  int src, int dst, double size, double rate)
 365 {
 366   surf_action_network_CM02_t action = NULL;
 367   /* LARGE PLATFORMS HACK:
 368      Add a link_CM02_t *link and a int link_nb to network_card_CM02_t. It will represent local links for this node
 369      Use the cluster_id for ->id */
 370   xbt_dynar_t route = used_routing->get_route(src, dst);
 371   /* LARGE PLATFORMS HACK:
 372      total_route_size = route_size + src->link_nb + dst->nb */
 373   unsigned int i;
 374
 375   XBT_IN4("(%s,%s,%g,%g)", src_name, dst_name, size, rate);
 376   /* LARGE PLATFORMS HACK:
 377      assert on total_route_size */
 378   xbt_assert2(xbt_dynar_length(route),
 379               "You're trying to send data from %s to %s but there is no connection between these two hosts.",
 380               src_name, dst_name);
 381
 382   link_CM02_t link;
 383   int failed = 0;
 384   xbt_dynar_foreach(route, i, link) {
 385     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 386       failed = 1;
 387       break;
 388     }
 389   }
 390   action =
 391     surf_action_new(sizeof(s_surf_action_network_CM02_t), size,
 392                     surf_network_model, failed);
 393
 394   xbt_swag_insert(action, action->generic_action.state_set);
 395   action->rate = rate;
 396
 397   action->latency = 0.0;
 398   action->weight = 0.0;
 399   xbt_dynar_foreach(route, i, link) {
 400     action->latency += link->lat_current;
 401     action->weight +=
 402       link->lat_current +
 403       weight_S_parameter /
 404       (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 405   }
 406   /* LARGE PLATFORMS HACK:
 407      Add src->link and dst->link latencies */
 408   action->lat_current = action->latency;
 409   action->latency *= latency_factor;
 410
 411   /* LARGE PLATFORMS HACK:
 412      lmm_variable_new(..., total_route_size) */
 413   if (action->latency > 0)
 414     action->variable =
 415       lmm_variable_new(network_maxmin_system, action, 0.0, -1.0,
 416                        xbt_dynar_length(route));
 417   else
 418     action->variable =
 419       lmm_variable_new(network_maxmin_system, action, 1.0, -1.0,
 420                        xbt_dynar_length(route));
 421
 422   if (action->rate < 0) {
 423     if (action->lat_current > 0)
 424       lmm_update_variable_bound(network_maxmin_system, action->variable,
 425                                 sg_tcp_gamma / (2.0 * action->lat_current));
 426     else
 427       lmm_update_variable_bound(network_maxmin_system, action->variable,
 428                                 -1.0);
 429   } else {
 430     if (action->lat_current > 0)
 431       lmm_update_variable_bound(network_maxmin_system, action->variable,
 432                                 min(action->rate,
 433                                     sg_tcp_gamma / (2.0 *
 434                                                     action->lat_current)));
 435     else
 436       lmm_update_variable_bound(network_maxmin_system, action->variable,
 437                                 action->rate);
 438   }
 439
 440   xbt_dynar_foreach(route, i, link) {
 441     lmm_expand(network_maxmin_system, link->lmm_resource.constraint,
 442                action->variable, 1.0);
 443   }
 444   /* LARGE PLATFORMS HACK:
 445      expand also with src->link and dst->link */
 446
 447   XBT_OUT;
 448
 449   return (surf_action_t) action;
 450 }
 451
 452 static double get_link_bandwidth(const void *link)
 453 {
 454   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 455   return lmm->power.peak * lmm->power.scale;
 456 }
 457
 458 static double get_link_latency(const void *link)
 459 {
 460   return ((link_CM02_t) link)->lat_current;
 461 }
 462
 463 static int link_shared(const void *link)
 464 {
 465   return lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 466 }
 467
 468 static void action_suspend(surf_action_t action)
 469 {
 470   ((surf_action_network_CM02_t) action)->suspended = 1;
 471   lmm_update_variable_weight(network_maxmin_system,
 472                              ((surf_action_network_CM02_t) action)->variable,
 473                              0.0);
 474 }
 475
 476 static void action_resume(surf_action_t action)
 477 {
 478   if (((surf_action_network_CM02_t) action)->suspended) {
 479     lmm_update_variable_weight(network_maxmin_system,
 480                                ((surf_action_network_CM02_t)
 481                                 action)->variable,
 482                                ((surf_action_network_CM02_t) action)->weight);
 483     ((surf_action_network_CM02_t) action)->suspended = 0;
 484   }
 485 }
 486
 487 static int action_is_suspended(surf_action_t action)
 488 {
 489   return ((surf_action_network_CM02_t) action)->suspended;
 490 }
 491
 492 static void action_set_max_duration(surf_action_t action, double duration)
 493 {
 494   action->max_duration = duration;
 495 }
 496
 497 static void finalize(void)
 498 {
 499   surf_model_exit(surf_network_model);
 500   surf_network_model = NULL;
 501
 502   used_routing->finalize();
 503   lmm_system_free(network_maxmin_system);
 504   network_maxmin_system = NULL;
 505 }
 506
 507 static void surf_network_model_init_internal(void)
 508 {
 509   surf_network_model = surf_model_init();
 510
 511   surf_network_model->name = "network";
 512   surf_network_model->action_unref = action_unref;
 513   surf_network_model->action_cancel = action_cancel;
 514   surf_network_model->action_recycle = action_recycle;
 515   surf_network_model->get_remains = action_get_remains;
 516
 517   surf_network_model->model_private->resource_used = resource_used;
 518   surf_network_model->model_private->share_resources = share_resources;
 519   surf_network_model->model_private->update_actions_state =
 520     update_actions_state;
 521   surf_network_model->model_private->update_resource_state =
 522     update_resource_state;
 523   surf_network_model->model_private->finalize = finalize;
 524
 525   surf_network_model->suspend = action_suspend;
 526   surf_network_model->resume = action_resume;
 527   surf_network_model->is_suspended = action_is_suspended;
 528   surf_cpu_model->set_max_duration = action_set_max_duration;
 529
 530   surf_network_model->extension.network.communicate = communicate;
 531   surf_network_model->extension.network.get_link_bandwidth =
 532     get_link_bandwidth;
 533   surf_network_model->extension.network.get_link_latency = get_link_latency;
 534   surf_network_model->extension.network.link_shared = link_shared;
 535
 536   if (!network_maxmin_system)
 537     network_maxmin_system = lmm_system_new();
 538
 539   routing_model_create(sizeof(link_CM02_t),
 540                        link_new(xbt_strdup("__loopback__"),
 541                                 498000000, NULL, 0.000015, NULL,
 542                                 SURF_RESOURCE_ON, NULL, SURF_LINK_FATPIPE,
 543                                 NULL));
 544 }
 545
 546 /************************************************************************/
 547 /* New model based on optimizations discussed during this thesis        */
 548 /************************************************************************/
 549 void surf_network_model_init_LegrandVelho(const char *filename)
 550 {
 551
 552   if (surf_network_model)
 553     return;
 554   surf_network_model_init_internal();
 555   define_callbacks(filename);
 556   xbt_dynar_push(model_list, &surf_network_model);
 557   network_solve = lmm_solve;
 558
 559   latency_factor = 10.4;
 560   bandwidth_factor = 0.92;
 561   weight_S_parameter = 8775;
 562
 563   update_model_description(surf_network_model_description,
 564                            "LV08", surf_network_model);
 565 }
 566
 567 /***************************************************************************/
 568 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 569 /***************************************************************************/
 570 /* @TechReport{      rr-lip2002-40, */
 571 /*   author        = {Henri Casanova and Loris Marchal}, */
 572 /*   institution   = {LIP}, */
 573 /*   title         = {A Network Model for Simulation of Grid Application}, */
 574 /*   number        = {2002-40}, */
 575 /*   month         = {oct}, */
 576 /*   year          = {2002} */
 577 /* } */
 578 void surf_network_model_init_CM02(const char *filename)
 579 {
 580
 581   if (surf_network_model)
 582     return;
 583   surf_network_model_init_internal();
 584   define_callbacks(filename);
 585   xbt_dynar_push(model_list, &surf_network_model);
 586   network_solve = lmm_solve;
 587
 588   update_model_description(surf_network_model_description,
 589                            "CM02", surf_network_model);
 590 }
 591
 592 void surf_network_model_init_Reno(const char *filename)
 593 {
 594   if (surf_network_model)
 595     return;
 596   surf_network_model_init_internal();
 597   define_callbacks(filename);
 598
 599   xbt_dynar_push(model_list, &surf_network_model);
 600   lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
 601   network_solve = lagrange_solve;
 602
 603   latency_factor = 10.4;
 604   bandwidth_factor = 0.92;
 605   weight_S_parameter = 8775;
 606
 607   update_model_description(surf_network_model_description,
 608                            "Reno", surf_network_model);
 609 }
 610
 611
 612 void surf_network_model_init_Reno2(const char *filename)
 613 {
 614   if (surf_network_model)
 615     return;
 616   surf_network_model_init_internal();
 617   define_callbacks(filename);
 618
 619   xbt_dynar_push(model_list, &surf_network_model);
 620   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 621                                     func_reno2_fpi);
 622   network_solve = lagrange_solve;
 623
 624   latency_factor = 10.4;
 625   bandwidth_factor = 0.92;
 626   weight_S_parameter = 8775;
 627
 628   update_model_description(surf_network_model_description,
 629                            "Reno2", surf_network_model);
 630 }
 631
 632 void surf_network_model_init_Vegas(const char *filename)
 633 {
 634   if (surf_network_model)
 635     return;
 636   surf_network_model_init_internal();
 637   define_callbacks(filename);
 638
 639   xbt_dynar_push(model_list, &surf_network_model);
 640   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 641                                     func_vegas_fpi);
 642   network_solve = lagrange_solve;
 643
 644   latency_factor = 10.4;
 645   bandwidth_factor = 0.92;
 646   weight_S_parameter = 8775;
 647
 648   update_model_description(surf_network_model_description,
 649                            "Vegas", surf_network_model);
 650 }