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 int card_number = 0;
  24 int host_count = 0;
  25 double sg_tcp_gamma = 0.0;
  26
  27
  28 static void link_free(void *nw_link)
  29 {
  30   xbt_dict_free(&(((link_CM02_t) nw_link)->properties));
  31   surf_resource_free(nw_link);
  32 }
  33
  34 static link_CM02_t link_new(char *name,
  35                             double bw_initial,
  36                             tmgr_trace_t bw_trace,
  37                             double lat_initial,
  38                             tmgr_trace_t lat_trace,
  39                             e_surf_link_state_t
  40                             state_initial,
  41                             tmgr_trace_t state_trace,
  42                             e_surf_link_sharing_policy_t
  43                             policy, xbt_dict_t properties)
  44 {
  45   link_CM02_t nw_link = xbt_new0(s_link_CM02_t, 1);
  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->generic_resource.model = surf_network_model;
  50   nw_link->generic_resource.name = name;
  51   nw_link->bw_current = bw_initial;
  52   if (bw_trace)
  53     nw_link->bw_event =
  54       tmgr_history_add_trace(history, bw_trace, 0.0, 0, nw_link);
  55   nw_link->lat_current = lat_initial;
  56   if (lat_trace)
  57     nw_link->lat_event =
  58       tmgr_history_add_trace(history, lat_trace, 0.0, 0, nw_link);
  59   nw_link->state_current = state_initial;
  60   if (state_trace)
  61     nw_link->state_event =
  62       tmgr_history_add_trace(history, state_trace, 0.0, 0, nw_link);
  63
  64   nw_link->constraint =
  65     lmm_constraint_new(network_maxmin_system, nw_link,
  66                        bandwidth_factor * nw_link->bw_current);
  67
  68   if (policy == SURF_LINK_FATPIPE)
  69     lmm_constraint_shared(nw_link->constraint);
  70
  71   nw_link->properties = properties;
  72
  73   current_property_set = properties;
  74
  75   xbt_dict_set(surf_network_model->resource_set, name, nw_link, link_free);
  76
  77   return nw_link;
  78 }
  79
  80 static void parse_link_init(void)
  81 {
  82   char *name_link;
  83   double bw_initial;
  84   tmgr_trace_t bw_trace;
  85   double lat_initial;
  86   tmgr_trace_t lat_trace;
  87   e_surf_link_state_t state_initial_link = SURF_LINK_ON;
  88   e_surf_link_sharing_policy_t policy_initial_link = SURF_LINK_SHARED;
  89   tmgr_trace_t state_trace;
  90
  91   name_link = xbt_strdup(A_surfxml_link_id);
  92   surf_parse_get_double(&bw_initial, A_surfxml_link_bandwidth);
  93   surf_parse_get_trace(&bw_trace, A_surfxml_link_bandwidth_file);
  94   surf_parse_get_double(&lat_initial, A_surfxml_link_latency);
  95   surf_parse_get_trace(&lat_trace, A_surfxml_link_latency_file);
  96
  97   xbt_assert0((A_surfxml_link_state == A_surfxml_link_state_ON)
  98               || (A_surfxml_link_state ==
  99                   A_surfxml_link_state_OFF), "Invalid state");
 100   if (A_surfxml_link_state == A_surfxml_link_state_ON)
 101     state_initial_link = SURF_LINK_ON;
 102   else if (A_surfxml_link_state == A_surfxml_link_state_OFF)
 103     state_initial_link = SURF_LINK_OFF;
 104
 105   if (A_surfxml_link_sharing_policy == A_surfxml_link_sharing_policy_SHARED)
 106     policy_initial_link = SURF_LINK_SHARED;
 107   else if (A_surfxml_link_sharing_policy ==
 108            A_surfxml_link_sharing_policy_FATPIPE)
 109     policy_initial_link = SURF_LINK_FATPIPE;
 110
 111   surf_parse_get_trace(&state_trace, A_surfxml_link_state_file);
 112
 113   link_new(name_link, bw_initial, bw_trace,
 114            lat_initial, lat_trace, state_initial_link, state_trace,
 115            policy_initial_link, xbt_dict_new());
 116
 117 }
 118
 119 static void add_traces(void)
 120 {
 121   xbt_dict_cursor_t cursor = NULL;
 122   char *trace_name, *elm;
 123
 124   static int called = 0;
 125   if (called)
 126     return;
 127   called = 1;
 128
 129   /* connect all traces relative to network */
 130   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 131     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 132     link_CM02_t link = xbt_dict_get_or_null(surf_network_model->resource_set, elm);
 133
 134     xbt_assert2(link, "Cannot connect trace %s to link %s: link undefined",
 135                 trace_name, elm);
 136     xbt_assert2(trace, "Cannot connect trace %s to link %s: trace undefined",
 137                 trace_name, elm);
 138
 139     link->state_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 140   }
 141
 142   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 143     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 144     link_CM02_t link = 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->bw_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 152   }
 153
 154   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 155     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 156     link_CM02_t link = xbt_dict_get_or_null(surf_network_model->resource_set, elm);
 157
 158     xbt_assert2(link, "Cannot connect trace %s to link %s: link undefined",
 159                 trace_name, elm);
 160     xbt_assert2(trace, "Cannot connect trace %s to link %s: trace undefined",
 161                 trace_name, elm);
 162
 163     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 164   }
 165 }
 166
 167 static void define_callbacks(const char *file)
 168 {
 169   /* Figuring out the network links */
 170   surfxml_add_callback(STag_surfxml_link_cb_list, &parse_link_init);
 171   surfxml_add_callback(ETag_surfxml_platform_cb_list, &add_traces);
 172 }
 173
 174 static int resource_used(void *resource_id)
 175 {
 176   return lmm_constraint_used(network_maxmin_system,
 177                              ((link_CM02_t) resource_id)->constraint);
 178 }
 179
 180 static int action_unref(surf_action_t action)
 181 {
 182   action->refcount--;
 183   if (!action->refcount) {
 184     xbt_swag_remove(action, action->state_set);
 185     if (((surf_action_network_CM02_t) action)->variable)
 186       lmm_variable_free(network_maxmin_system,
 187                         ((surf_action_network_CM02_t) action)->variable);
 188     free(action);
 189     return 1;
 190   }
 191   return 0;
 192 }
 193
 194 static void action_cancel(surf_action_t action)
 195 {
 196   return;
 197 }
 198
 199 static void action_recycle(surf_action_t action)
 200 {
 201   return;
 202 }
 203
 204 static double share_resources(double now)
 205 {
 206   s_surf_action_network_CM02_t s_action;
 207   surf_action_network_CM02_t action = NULL;
 208   xbt_swag_t running_actions = surf_network_model->states.running_action_set;
 209   double min;
 210
 211   min = generic_maxmin_share_resources(running_actions,
 212                                        xbt_swag_offset(s_action,
 213                                                        variable),
 214                                        network_maxmin_system, network_solve);
 215
 216 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 217
 218   xbt_swag_foreach(action, running_actions) {
 219     if (action->latency > 0) {
 220       if (min < 0)
 221         min = action->latency;
 222       else if (action->latency < min)
 223         min = action->latency;
 224     }
 225   }
 226
 227   return min;
 228 }
 229
 230 static void update_actions_state(double now, double delta)
 231 {
 232   double deltap = 0.0;
 233   surf_action_network_CM02_t action = NULL;
 234   surf_action_network_CM02_t next_action = NULL;
 235   xbt_swag_t running_actions = surf_network_model->states.running_action_set;
 236   /*
 237      xbt_swag_t failed_actions =
 238      surf_network_model->states.failed_action_set;
 239    */
 240
 241   xbt_swag_foreach_safe(action, next_action, running_actions) {
 242     deltap = delta;
 243     if (action->latency > 0) {
 244       if (action->latency > deltap) {
 245         double_update(&(action->latency), deltap);
 246         deltap = 0.0;
 247       } else {
 248         double_update(&(deltap), action->latency);
 249         action->latency = 0.0;
 250       }
 251       if ((action->latency == 0.0) && !(action->suspended))
 252         lmm_update_variable_weight(network_maxmin_system, action->variable,
 253                                    action->weight);
 254     }
 255     double_update(&(action->generic_action.remains),
 256                   lmm_variable_getvalue(action->variable) * deltap);
 257     if (action->generic_action.max_duration != NO_MAX_DURATION)
 258       double_update(&(action->generic_action.max_duration), delta);
 259
 260     if ((action->generic_action.remains <= 0) &&
 261         (lmm_get_variable_weight(action->variable) > 0)) {
 262       action->generic_action.finish = surf_get_clock();
 263       surf_network_model->action_state_set((surf_action_t) action, SURF_ACTION_DONE);
 264     } else if ((action->generic_action.max_duration != NO_MAX_DURATION) &&
 265                (action->generic_action.max_duration <= 0)) {
 266       action->generic_action.finish = surf_get_clock();
 267       surf_network_model->action_state_set((surf_action_t) action, SURF_ACTION_DONE);
 268     }
 269   }
 270
 271   return;
 272 }
 273
 274 static void update_resource_state(void *id,
 275                                   tmgr_trace_event_t event_type,
 276                                   double value, double date)
 277 {
 278   link_CM02_t nw_link = id;
 279   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 280   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 281   /*     value, event_type); */
 282
 283   if (event_type == nw_link->bw_event) {
 284     double delta =
 285       weight_S_parameter / value - weight_S_parameter / nw_link->bw_current;
 286     lmm_variable_t var = NULL;
 287     lmm_element_t elem = NULL;
 288     surf_action_network_CM02_t action = NULL;
 289
 290     nw_link->bw_current = value;
 291     lmm_update_constraint_bound(network_maxmin_system, nw_link->constraint,
 292                                 bandwidth_factor * nw_link->bw_current);
 293     if (weight_S_parameter > 0) {
 294       while ((var = lmm_get_var_from_cnst
 295               (network_maxmin_system, nw_link->constraint, &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   } else if (event_type == nw_link->lat_event) {
 304     double delta = value - nw_link->lat_current;
 305     lmm_variable_t var = NULL;
 306     lmm_element_t elem = NULL;
 307     surf_action_network_CM02_t action = NULL;
 308
 309     nw_link->lat_current = value;
 310     while ((var = lmm_get_var_from_cnst
 311             (network_maxmin_system, nw_link->constraint, &elem))) {
 312       action = lmm_variable_id(var);
 313       action->lat_current += delta;
 314       action->weight += delta;
 315       if (action->rate < 0)
 316         lmm_update_variable_bound(network_maxmin_system, action->variable,
 317                                   sg_tcp_gamma / (2.0 * action->lat_current));
 318       else
 319         lmm_update_variable_bound(network_maxmin_system, action->variable,
 320                                   min(action->rate,
 321                                       sg_tcp_gamma / (2.0 *
 322                                                       action->lat_current)));
 323       if (!(action->suspended))
 324         lmm_update_variable_weight(network_maxmin_system, action->variable,
 325                                    action->weight);
 326
 327     }
 328   } else if (event_type == nw_link->state_event) {
 329     if (value > 0)
 330       nw_link->state_current = SURF_LINK_ON;
 331     else {
 332       lmm_constraint_t cnst = nw_link->constraint;
 333       lmm_variable_t var = NULL;
 334       lmm_element_t elem = NULL;
 335
 336       nw_link->state_current = SURF_LINK_OFF;
 337       while ((var = lmm_get_var_from_cnst
 338               (network_maxmin_system, cnst, &elem))) {
 339         surf_action_t action = lmm_variable_id(var);
 340
 341         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 342             surf_action_state_get(action) == SURF_ACTION_READY) {
 343           action->finish = date;
 344           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 345         }
 346       }
 347     }
 348   } else {
 349     CRITICAL0("Unknown event ! \n");
 350     xbt_abort();
 351   }
 352
 353   return;
 354 }
 355
 356 static surf_action_t communicate(const char *src_name, const char *dst_name,int src, int dst, double size,
 357                                  double rate)
 358 {
 359   surf_action_network_CM02_t action = NULL;
 360   /* LARGE PLATFORMS HACK:
 361      Add a link_CM02_t *link and a int link_nb to network_card_CM02_t. It will represent local links for this node
 362      Use the cluster_id for ->id */
 363   xbt_dynar_t route = used_routing->get_route(src, dst);
 364   /* LARGE PLATFORMS HACK:
 365      total_route_size = route_size + src->link_nb + dst->nb */
 366   unsigned int i;
 367
 368   XBT_IN4("(%s,%s,%g,%g)", src_name, dst_name, size, rate);
 369   /* LARGE PLATFORMS HACK:
 370      assert on total_route_size */
 371   xbt_assert2(xbt_dynar_length(route),
 372               "You're trying to send data from %s to %s but there is no connection between these two hosts.",
 373               src_name, dst_name);
 374
 375   action = xbt_new0(s_surf_action_network_CM02_t, 1);
 376
 377   action->generic_action.refcount = 1;
 378   action->generic_action.cost = size;
 379   action->generic_action.remains = size;
 380   action->generic_action.max_duration = NO_MAX_DURATION;
 381   action->generic_action.start = surf_get_clock();
 382   action->generic_action.finish = -1.0;
 383   action->generic_action.model_type = surf_network_model;
 384   action->suspended = 0;        /* Should be useless because of the
 385                                    calloc but it seems to help valgrind... */
 386   action->generic_action.state_set =
 387     surf_network_model->states.running_action_set;
 388
 389   link_CM02_t link;
 390   xbt_dynar_foreach(route,i,link) {
 391     if (link->state_current == SURF_LINK_OFF) {
 392       action->generic_action.state_set =
 393         surf_network_model->states.failed_action_set;
 394       break;
 395     }
 396   }
 397
 398   xbt_swag_insert(action, action->generic_action.state_set);
 399   action->rate = rate;
 400
 401   action->latency = 0.0;
 402   action->weight = 0.0;
 403   xbt_dynar_foreach(route,i,link) {
 404     action->latency += link->lat_current;
 405     action->weight +=
 406       link->lat_current + weight_S_parameter / link->bw_current;
 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, xbt_dynar_length(route));
 418   else
 419     action->variable =
 420       lmm_variable_new(network_maxmin_system, action, 1.0, -1.0, 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->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   return ((link_CM02_t) link)->bw_current;
 455 }
 456
 457 static double get_link_latency(const void *link)
 458 {
 459   return ((link_CM02_t) link)->lat_current;
 460 }
 461
 462 static int link_shared(const void *link)
 463 {
 464   return lmm_constraint_is_shared(((link_CM02_t) link)->constraint);
 465 }
 466
 467 static xbt_dict_t get_properties(void *link)
 468 {
 469   return ((link_CM02_t) link)->properties;
 470 }
 471
 472 static void action_suspend(surf_action_t action)
 473 {
 474   ((surf_action_network_CM02_t) action)->suspended = 1;
 475   lmm_update_variable_weight(network_maxmin_system,
 476                              ((surf_action_network_CM02_t) action)->variable,
 477                              0.0);
 478 }
 479
 480 static void action_resume(surf_action_t action)
 481 {
 482   if (((surf_action_network_CM02_t) action)->suspended) {
 483     lmm_update_variable_weight(network_maxmin_system,
 484                                ((surf_action_network_CM02_t)
 485                                 action)->variable,
 486                                ((surf_action_network_CM02_t) action)->weight);
 487     ((surf_action_network_CM02_t) action)->suspended = 0;
 488   }
 489 }
 490
 491 static int action_is_suspended(surf_action_t action)
 492 {
 493   return ((surf_action_network_CM02_t) action)->suspended;
 494 }
 495
 496 static void action_set_max_duration(surf_action_t action, double duration)
 497 {
 498   action->max_duration = duration;
 499 }
 500
 501 static void finalize(void)
 502 {
 503   surf_model_exit(surf_network_model);
 504   surf_network_model = NULL;
 505
 506   used_routing->finalize();
 507   host_count = 0;
 508   lmm_system_free(network_maxmin_system);
 509   network_maxmin_system = NULL;
 510 }
 511
 512 static void surf_network_model_init_internal(void)
 513 {
 514   surf_network_model = surf_model_init();
 515
 516   surf_network_model->name = "network";
 517   surf_network_model->action_unref = action_unref;
 518   surf_network_model->action_cancel = action_cancel;
 519   surf_network_model->action_recycle = action_recycle;
 520
 521   surf_network_model->model_private->resource_used = resource_used;
 522   surf_network_model->model_private->share_resources = share_resources;
 523   surf_network_model->model_private->update_actions_state =
 524     update_actions_state;
 525   surf_network_model->model_private->update_resource_state =
 526     update_resource_state;
 527   surf_network_model->model_private->finalize = finalize;
 528
 529   surf_network_model->suspend = action_suspend;
 530   surf_network_model->resume = action_resume;
 531   surf_network_model->is_suspended = action_is_suspended;
 532   surf_cpu_model->set_max_duration = action_set_max_duration;
 533
 534   surf_network_model->extension.network.communicate = communicate;
 535   surf_network_model->extension.network.get_link_bandwidth =
 536     get_link_bandwidth;
 537   surf_network_model->extension.network.get_link_latency = get_link_latency;
 538   surf_network_model->extension.network.link_shared = link_shared;
 539
 540   surf_network_model->get_properties = get_properties;
 541
 542   if (!network_maxmin_system)
 543     network_maxmin_system = lmm_system_new();
 544
 545   routing_model_full_create(sizeof(link_CM02_t),
 546       link_new(xbt_strdup("__loopback__"),
 547           498000000, NULL, 0.000015, NULL,
 548           SURF_LINK_ON, NULL, SURF_LINK_FATPIPE, NULL));
 549 }
 550
 551 /************************************************************************/
 552 /* New model based on optimizations discussed during this thesis        */
 553 /************************************************************************/
 554 void surf_network_model_init_LegrandVelho(const char *filename)
 555 {
 556
 557   if (surf_network_model)
 558     return;
 559   surf_network_model_init_internal();
 560   define_callbacks(filename);
 561   xbt_dynar_push(model_list, &surf_network_model);
 562   network_solve = lmm_solve;
 563
 564   latency_factor = 10.4;
 565   bandwidth_factor = 0.92;
 566   weight_S_parameter = 8775;
 567
 568   update_model_description(surf_network_model_description,
 569                            "LegrandVelho", surf_network_model);
 570 }
 571
 572 /***************************************************************************/
 573 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 574 /***************************************************************************/
 575 /* @TechReport{      rr-lip2002-40, */
 576 /*   author        = {Henri Casanova and Loris Marchal}, */
 577 /*   institution   = {LIP}, */
 578 /*   title         = {A Network Model for Simulation of Grid Application}, */
 579 /*   number        = {2002-40}, */
 580 /*   month         = {oct}, */
 581 /*   year          = {2002} */
 582 /* } */
 583 void surf_network_model_init_CM02(const char *filename)
 584 {
 585
 586   if (surf_network_model)
 587     return;
 588   surf_network_model_init_internal();
 589   define_callbacks(filename);
 590   xbt_dynar_push(model_list, &surf_network_model);
 591   network_solve = lmm_solve;
 592
 593   update_model_description(surf_network_model_description,
 594                            "CM02", surf_network_model);
 595 }
 596
 597 void surf_network_model_init_Reno(const char *filename)
 598 {
 599   if (surf_network_model)
 600     return;
 601   surf_network_model_init_internal();
 602   define_callbacks(filename);
 603
 604   xbt_dynar_push(model_list, &surf_network_model);
 605   lmm_set_default_protocol_function(func_reno_f, func_reno_fp, func_reno_fpi);
 606   network_solve = lagrange_solve;
 607
 608   latency_factor = 10.4;
 609   bandwidth_factor = 0.92;
 610   weight_S_parameter = 8775;
 611
 612   update_model_description(surf_network_model_description,
 613                            "Reno", surf_network_model);
 614 }
 615
 616
 617 void surf_network_model_init_Reno2(const char *filename)
 618 {
 619   if (surf_network_model)
 620     return;
 621   surf_network_model_init_internal();
 622   define_callbacks(filename);
 623
 624   xbt_dynar_push(model_list, &surf_network_model);
 625   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 626                                     func_reno2_fpi);
 627   network_solve = lagrange_solve;
 628
 629   latency_factor = 10.4;
 630   bandwidth_factor = 0.92;
 631   weight_S_parameter = 8775;
 632
 633   update_model_description(surf_network_model_description,
 634                            "Reno2", surf_network_model);
 635 }
 636
 637 void surf_network_model_init_Vegas(const char *filename)
 638 {
 639   if (surf_network_model)
 640     return;
 641   surf_network_model_init_internal();
 642   define_callbacks(filename);
 643
 644   xbt_dynar_push(model_list, &surf_network_model);
 645   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 646                                     func_vegas_fpi);
 647   network_solve = lagrange_solve;
 648
 649   latency_factor = 10.4;
 650   bandwidth_factor = 0.92;
 651   weight_S_parameter = 8775;
 652
 653   update_model_description(surf_network_model_description,
 654                            "Vegas", surf_network_model);
 655 }
 656
 657 #ifdef HAVE_SDP
 658 void surf_network_model_init_SDP(const char *filename)
 659 {
 660   if (surf_network_model)
 661     return;
 662   surf_network_model_init_internal();
 663   define_callbacks(filename);
 664
 665   xbt_dynar_push(model_list, &surf_network_model);
 666   network_solve = sdp_solve;
 667
 668   update_model_description(surf_network_model_description,
 669                            "SDP", surf_network_model);
 670 }
 671 #endif