src/surf/network.c

   1 /* Copyright (c) 2004, 2005, 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include "network_private.h"
   8 #include "xbt/log.h"
   9 #include "xbt/str.h"
  10
  11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_network, surf,
  12                                 "Logging specific to the SURF network module");
  13
  14 surf_model_t surf_network_model = NULL;
  15 static lmm_system_t network_maxmin_system = NULL;
  16 static void (*network_solve) (lmm_system_t) = NULL;
  17
  18 double sg_sender_gap = 0.0;
  19 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
  20 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
  21 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
  22
  23 double sg_tcp_gamma = 0.0;
  24 int sg_network_fullduplex = 0;
  25
  26 xbt_dict_t gap_lookup = NULL;
  27
  28 static double net_get_link_bandwidth(const void *link);
  29
  30 static void gap_append(double size, const link_CM02_t link, surf_action_network_CM02_t action) {
  31    const char* src = link->lmm_resource.generic_resource.name;
  32    xbt_fifo_t fifo;
  33    surf_action_network_CM02_t last_action;
  34    double bw;
  35
  36    if(sg_sender_gap > 0.0) {
  37       if(!gap_lookup) {
  38          gap_lookup = xbt_dict_new();
  39       }
  40       fifo = (xbt_fifo_t)xbt_dict_get_or_null(gap_lookup, src);
  41       action->sender.gap = 0.0;
  42       if(fifo && xbt_fifo_size(fifo) > 0) {
  43          /* Compute gap from last send */
  44          last_action = (surf_action_network_CM02_t)xbt_fifo_get_item_content(xbt_fifo_get_last_item(fifo));
  45          bw = net_get_link_bandwidth(link);
  46          action->sender.gap = last_action->sender.gap + max(sg_sender_gap, last_action->sender.size / bw);
  47          action->latency += action->sender.gap;
  48       }
  49       /* Append action as last send */
  50       action->sender.link_name = link->lmm_resource.generic_resource.name;
  51       fifo = (xbt_fifo_t)xbt_dict_get_or_null(gap_lookup, action->sender.link_name);
  52       if(!fifo) {
  53          fifo = xbt_fifo_new();
  54          xbt_dict_set(gap_lookup, action->sender.link_name, fifo, NULL);
  55       }
  56       action->sender.fifo_item = xbt_fifo_push(fifo, action);
  57       action->sender.size = size;
  58    }
  59 }
  60
  61 static void gap_unknown(surf_action_network_CM02_t action) {
  62    action->sender.gap = 0.0;
  63    action->sender.link_name = NULL;
  64    action->sender.fifo_item = NULL;
  65    action->sender.size = 0.0;
  66 }
  67
  68 static void gap_remove(surf_action_network_CM02_t action) {
  69    xbt_fifo_t fifo;
  70    size_t size;
  71
  72    if(sg_sender_gap > 0.0 && action->sender.link_name && action->sender.fifo_item) {
  73       fifo = (xbt_fifo_t)xbt_dict_get_or_null(gap_lookup, action->sender.link_name);
  74       xbt_fifo_remove_item(fifo, action->sender.fifo_item);
  75       size = xbt_fifo_size(fifo);
  76       if(size == 0) {
  77          xbt_fifo_free(fifo);
  78          xbt_dict_remove(gap_lookup, action->sender.link_name);
  79          size = xbt_dict_size(gap_lookup);
  80          if(size == 0) {
  81             xbt_dict_free(&gap_lookup);
  82          }
  83       }
  84    }
  85 }
  86
  87 /******************************************************************************/
  88 /*                           Factors callbacks                                */
  89 /******************************************************************************/
  90 static double constant_latency_factor(double size)
  91 {
  92   return sg_latency_factor;
  93 }
  94
  95 static double constant_bandwidth_factor(double size)
  96 {
  97   return sg_bandwidth_factor;
  98 }
  99
 100 static double constant_bandwidth_constraint(double rate, double bound,
 101                                             double size)
 102 {
 103   return rate;
 104 }
 105
 106 /**********************/
 107 /*   SMPI callbacks   */
 108 /**********************/
 109 static double smpi_latency_factor(double size)
 110 {
 111   /* 1 B <= size <= 1 KiB */
 112   if (size <= 1024.0) {
 113     return 1.0056;
 114   }
 115
 116   /* 2 KiB <= size <= 32 KiB */
 117   if (size <= 32768.0) {
 118     return 1.8805;
 119   }
 120
 121   /* 64 KiB <= size <= 4 MiB */
 122   return 22.7111;
 123 }
 124
 125 static double smpi_bandwidth_factor(double size)
 126 {
 127   /* 1 B <= size <= 1 KiB */
 128   if (size <= 1024.0) {
 129     return 0.2758;
 130   }
 131
 132   /* 2 KiB <= size <= 32 KiB */
 133   if (size <= 32768.0) {
 134     return 0.5477;
 135   }
 136
 137   /* 64 KiB <= size <= 4 MiB */
 138   return 0.9359;
 139 }
 140
 141 static double smpi_bandwidth_constraint(double rate, double bound,
 142                                         double size)
 143 {
 144   return rate < 0 ? bound : min(bound, rate * smpi_bandwidth_factor(size));
 145 }
 146
 147
 148 static double (*latency_factor_callback) (double) =
 149     &constant_latency_factor;
 150 static double (*bandwidth_factor_callback) (double) =
 151     &constant_bandwidth_factor;
 152 static double (*bandwidth_constraint_callback) (double, double, double) =
 153     &constant_bandwidth_constraint;
 154
 155
 156 static link_CM02_t net_link_new(char *name,
 157                                 double bw_initial,
 158                                 tmgr_trace_t bw_trace,
 159                                 double lat_initial,
 160                                 tmgr_trace_t lat_trace,
 161                                 e_surf_resource_state_t
 162                                 state_initial,
 163                                 tmgr_trace_t state_trace,
 164                                 e_surf_link_sharing_policy_t
 165                                 policy, xbt_dict_t properties)
 166 {
 167   link_CM02_t nw_link = (link_CM02_t)
 168       surf_resource_lmm_new(sizeof(s_link_CM02_t),
 169                             surf_network_model, name, properties,
 170                             network_maxmin_system,
 171                             sg_bandwidth_factor * bw_initial,
 172                             history,
 173                             state_initial, state_trace,
 174                             bw_initial, bw_trace);
 175
 176   xbt_assert1(!xbt_dict_get_or_null
 177               (surf_network_model->resource_set, name),
 178               "Link '%s' declared several times in the platform file.",
 179               name);
 180
 181   nw_link->lat_current = lat_initial;
 182   if (lat_trace)
 183     nw_link->lat_event =
 184         tmgr_history_add_trace(history, lat_trace, 0.0, 0, nw_link);
 185
 186   if (policy == SURF_LINK_FATPIPE)
 187     lmm_constraint_shared(nw_link->lmm_resource.constraint);
 188
 189   xbt_dict_set(surf_network_model->resource_set, name, nw_link,
 190                surf_resource_free);
 191
 192   return nw_link;
 193 }
 194
 195 static void net_parse_link_init(void)
 196 {
 197   char *name_link;
 198   double bw_initial;
 199   tmgr_trace_t bw_trace;
 200   double lat_initial;
 201   tmgr_trace_t lat_trace;
 202   e_surf_resource_state_t state_initial_link = SURF_RESOURCE_ON;
 203   e_surf_link_sharing_policy_t policy_initial_link = SURF_LINK_SHARED;
 204   tmgr_trace_t state_trace;
 205   XBT_DEBUG("link_CM02");
 206   name_link = xbt_strdup(A_surfxml_link_id);
 207   surf_parse_get_double(&bw_initial, A_surfxml_link_bandwidth);
 208   bw_trace = tmgr_trace_new(A_surfxml_link_bandwidth_file);
 209   surf_parse_get_double(&lat_initial, A_surfxml_link_latency);
 210   lat_trace = tmgr_trace_new(A_surfxml_link_latency_file);
 211
 212   xbt_assert0((A_surfxml_link_state == A_surfxml_link_state_ON)
 213               || (A_surfxml_link_state ==
 214                   A_surfxml_link_state_OFF), "Invalid state");
 215   if (A_surfxml_link_state == A_surfxml_link_state_ON)
 216     state_initial_link = SURF_RESOURCE_ON;
 217   else if (A_surfxml_link_state == A_surfxml_link_state_OFF)
 218     state_initial_link = SURF_RESOURCE_OFF;
 219
 220   if (A_surfxml_link_sharing_policy == A_surfxml_link_sharing_policy_SHARED)
 221     policy_initial_link = SURF_LINK_SHARED;
 222   else
 223           {
 224           if (A_surfxml_link_sharing_policy == A_surfxml_link_sharing_policy_FATPIPE)
 225                   policy_initial_link = SURF_LINK_FATPIPE;
 226           else if (A_surfxml_link_sharing_policy == A_surfxml_link_sharing_policy_FULLDUPLEX)
 227                   policy_initial_link = SURF_LINK_FULLDUPLEX;
 228           }
 229
 230   state_trace = tmgr_trace_new(A_surfxml_link_state_file);
 231
 232   if(policy_initial_link == SURF_LINK_FULLDUPLEX)
 233   {
 234           net_link_new(bprintf("%s_UP",name_link), bw_initial, bw_trace,
 235                        lat_initial, lat_trace, state_initial_link, state_trace,
 236                        policy_initial_link, xbt_dict_new());
 237           net_link_new(bprintf("%s_DOWN",name_link), bw_initial, bw_trace,
 238                        lat_initial, lat_trace, state_initial_link, state_trace,
 239                        policy_initial_link, xbt_dict_new());
 240   }
 241   else
 242   {
 243           net_link_new(name_link, bw_initial, bw_trace,
 244                        lat_initial, lat_trace, state_initial_link, state_trace,
 245                        policy_initial_link, xbt_dict_new());
 246   }
 247
 248 }
 249
 250 static void net_create_resource(char *name,
 251                                 double bw_initial,
 252                                 tmgr_trace_t bw_trace,
 253                                 double lat_initial,
 254                                 tmgr_trace_t lat_trace,
 255                                 e_surf_resource_state_t
 256                                 state_initial,
 257                                 tmgr_trace_t state_trace,
 258                                 e_surf_link_sharing_policy_t policy,
 259                                 xbt_dict_t properties)
 260 {
 261   net_link_new(name, bw_initial, bw_trace,
 262                lat_initial, lat_trace, state_initial, state_trace,
 263                policy, xbt_dict_new());
 264 }
 265
 266 static void net_add_traces(void)
 267 {
 268   xbt_dict_cursor_t cursor = NULL;
 269   char *trace_name, *elm;
 270
 271   static int called = 0;
 272   if (called)
 273     return;
 274   called = 1;
 275
 276   /* connect all traces relative to network */
 277   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 278     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 279     link_CM02_t link =
 280         xbt_dict_get_or_null(surf_network_model->resource_set, elm);
 281
 282     xbt_assert2(link, "Cannot connect trace %s to link %s: link undefined",
 283                 trace_name, elm);
 284     xbt_assert2(trace,
 285                 "Cannot connect trace %s to link %s: trace undefined",
 286                 trace_name, elm);
 287
 288     link->lmm_resource.state_event =
 289         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 290   }
 291
 292   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 293     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 294     link_CM02_t link =
 295         xbt_dict_get_or_null(surf_network_model->resource_set, elm);
 296
 297     xbt_assert2(link, "Cannot connect trace %s to link %s: link undefined",
 298                 trace_name, elm);
 299     xbt_assert2(trace,
 300                 "Cannot connect trace %s to link %s: trace undefined",
 301                 trace_name, elm);
 302
 303     link->lmm_resource.power.event =
 304         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 305   }
 306
 307   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 308     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 309     link_CM02_t link =
 310         xbt_dict_get_or_null(surf_network_model->resource_set, elm);
 311
 312     xbt_assert2(link, "Cannot connect trace %s to link %s: link undefined",
 313                 trace_name, elm);
 314     xbt_assert2(trace,
 315                 "Cannot connect trace %s to link %s: trace undefined",
 316                 trace_name, elm);
 317
 318     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 319   }
 320 }
 321
 322 static void net_define_callbacks(const char *file)
 323 {
 324   /* Figuring out the network links */
 325   surfxml_add_callback(STag_surfxml_link_cb_list, &net_parse_link_init);
 326   surfxml_add_callback(ETag_surfxml_platform_cb_list, &net_add_traces);
 327 }
 328
 329 static int net_resource_used(void *resource_id)
 330 {
 331   return lmm_constraint_used(network_maxmin_system,
 332                              ((surf_resource_lmm_t)
 333                               resource_id)->constraint);
 334 }
 335
 336 static int net_action_unref(surf_action_t action)
 337 {
 338   action->refcount--;
 339   if (!action->refcount) {
 340     xbt_swag_remove(action, action->state_set);
 341     if (((surf_action_network_CM02_t) action)->variable)
 342       lmm_variable_free(network_maxmin_system,
 343                         ((surf_action_network_CM02_t) action)->variable);
 344 #ifdef HAVE_TRACING
 345     xbt_free(((surf_action_network_CM02_t) action)->src_name);
 346     xbt_free(((surf_action_network_CM02_t) action)->dst_name);
 347     if (action->category)
 348       xbt_free(action->category);
 349 #endif
 350     surf_action_free(&action);
 351     return 1;
 352   }
 353   return 0;
 354 }
 355
 356 static void net_action_cancel(surf_action_t action)
 357 {
 358   surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 359 }
 360
 361 void net_action_recycle(surf_action_t action)
 362 {
 363   return;
 364 }
 365
 366 #ifdef HAVE_LATENCY_BOUND_TRACKING
 367 int net_get_link_latency_limited(surf_action_t action)
 368 {
 369   return action->latency_limited;
 370 }
 371 #endif
 372
 373 double net_action_get_remains(surf_action_t action)
 374 {
 375   return action->remains;
 376 }
 377
 378 static double net_share_resources(double now)
 379 {
 380   s_surf_action_network_CM02_t s_action;
 381   surf_action_network_CM02_t action = NULL;
 382   xbt_swag_t running_actions =
 383       surf_network_model->states.running_action_set;
 384   double min;
 385
 386   min = generic_maxmin_share_resources(running_actions,
 387                                        xbt_swag_offset(s_action,
 388                                                        variable),
 389                                        network_maxmin_system,
 390                                        network_solve);
 391
 392 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 393
 394   xbt_swag_foreach(action, running_actions) {
 395 #ifdef HAVE_LATENCY_BOUND_TRACKING
 396     if (lmm_is_variable_limited_by_latency(action->variable)) {
 397       (action->generic_action).latency_limited = 1;
 398     } else {
 399       (action->generic_action).latency_limited = 0;
 400     }
 401 #endif
 402     if (action->latency > 0) {
 403       if (min < 0)
 404         min = action->latency;
 405       else if (action->latency < min)
 406         min = action->latency;
 407     }
 408   }
 409
 410   XBT_DEBUG("Min of share resources %f", min);
 411
 412   return min;
 413 }
 414
 415 static void net_update_actions_state(double now, double delta)
 416 {
 417   double deltap = 0.0;
 418   surf_action_network_CM02_t action = NULL;
 419   surf_action_network_CM02_t next_action = NULL;
 420   xbt_swag_t running_actions =
 421       surf_network_model->states.running_action_set;
 422   /*
 423      xbt_swag_t failed_actions =
 424      surf_network_model->states.failed_action_set;
 425    */
 426
 427   xbt_swag_foreach_safe(action, next_action, running_actions) {
 428     deltap = delta;
 429     if (action->latency > 0) {
 430       if (action->latency > deltap) {
 431         double_update(&(action->latency), deltap);
 432         deltap = 0.0;
 433       } else {
 434         double_update(&(deltap), action->latency);
 435         action->latency = 0.0;
 436       }
 437       if ((action->latency == 0.0) && !(action->suspended))
 438         lmm_update_variable_weight(network_maxmin_system, action->variable,
 439                                    action->weight);
 440     }
 441 #ifdef HAVE_TRACING
 442     xbt_dynar_t route =
 443         global_routing->get_route(action->src_name, action->dst_name);
 444     link_CM02_t link;
 445     unsigned int i;
 446     xbt_dynar_foreach(route, i, link) {
 447       TRACE_surf_link_set_utilization(link->lmm_resource.generic_resource.name,
 448                                       action->generic_action.data,
 449                                       (surf_action_t) action,
 450                                       lmm_variable_getvalue
 451                                       (action->variable), now - delta,
 452                                       delta);
 453     }
 454 #endif
 455     if(!lmm_get_number_of_cnst_from_var(network_maxmin_system, action->variable)) {
 456                                 /* There is actually no link used, hence an infinite bandwidth.
 457                                  * This happens often when using models like vivaldi.
 458                                  * In such case, just make sure that the action completes immediately.
 459                                  */
 460         double_update(&(action->generic_action.remains),
 461                         action->generic_action.remains);
 462     }
 463     double_update(&(action->generic_action.remains),
 464                   lmm_variable_getvalue(action->variable) * deltap);
 465     if (action->generic_action.max_duration != NO_MAX_DURATION)
 466       double_update(&(action->generic_action.max_duration), delta);
 467
 468     if ((action->generic_action.remains <= 0) &&
 469         (lmm_get_variable_weight(action->variable) > 0)) {
 470       action->generic_action.finish = surf_get_clock();
 471       surf_network_model->action_state_set((surf_action_t) action,
 472                                            SURF_ACTION_DONE);
 473       gap_remove(action);
 474     } else if ((action->generic_action.max_duration != NO_MAX_DURATION)
 475                && (action->generic_action.max_duration <= 0)) {
 476       action->generic_action.finish = surf_get_clock();
 477       surf_network_model->action_state_set((surf_action_t) action,
 478                                            SURF_ACTION_DONE);
 479       gap_remove(action);
 480     }
 481   }
 482
 483   return;
 484 }
 485
 486 static void net_update_resource_state(void *id,
 487                                       tmgr_trace_event_t event_type,
 488                                       double value, double date)
 489 {
 490   link_CM02_t nw_link = id;
 491   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 492   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 493   /*     value, event_type); */
 494
 495   if (event_type == nw_link->lmm_resource.power.event) {
 496     double delta =
 497         sg_weight_S_parameter / value - sg_weight_S_parameter /
 498         (nw_link->lmm_resource.power.peak *
 499          nw_link->lmm_resource.power.scale);
 500     lmm_variable_t var = NULL;
 501     lmm_element_t elem = NULL;
 502     surf_action_network_CM02_t action = NULL;
 503
 504     nw_link->lmm_resource.power.peak = value;
 505     lmm_update_constraint_bound(network_maxmin_system,
 506                                 nw_link->lmm_resource.constraint,
 507                                 sg_bandwidth_factor *
 508                                 (nw_link->lmm_resource.power.peak *
 509                                  nw_link->lmm_resource.power.scale));
 510 #ifdef HAVE_TRACING
 511     TRACE_surf_link_set_bandwidth(date, nw_link->lmm_resource.generic_resource.name,
 512                                   sg_bandwidth_factor *
 513                                   (nw_link->lmm_resource.power.peak *
 514                                    nw_link->lmm_resource.power.scale));
 515 #endif
 516     if (sg_weight_S_parameter > 0) {
 517       while ((var = lmm_get_var_from_cnst
 518               (network_maxmin_system, nw_link->lmm_resource.constraint,
 519                &elem))) {
 520         action = lmm_variable_id(var);
 521         action->weight += delta;
 522         if (!(action->suspended))
 523           lmm_update_variable_weight(network_maxmin_system,
 524                                      action->variable, action->weight);
 525       }
 526     }
 527     if (tmgr_trace_event_free(event_type))
 528       nw_link->lmm_resource.power.event = NULL;
 529   } else if (event_type == nw_link->lat_event) {
 530     double delta = value - nw_link->lat_current;
 531     lmm_variable_t var = NULL;
 532     lmm_element_t elem = NULL;
 533     surf_action_network_CM02_t action = NULL;
 534
 535     nw_link->lat_current = value;
 536     while ((var = lmm_get_var_from_cnst
 537             (network_maxmin_system, nw_link->lmm_resource.constraint,
 538              &elem))) {
 539       action = lmm_variable_id(var);
 540       action->lat_current += delta;
 541       action->weight += delta;
 542       if (action->rate < 0)
 543         lmm_update_variable_bound(network_maxmin_system, action->variable,
 544                                   sg_tcp_gamma / (2.0 *
 545                                                   action->lat_current));
 546       else {
 547         lmm_update_variable_bound(network_maxmin_system, action->variable,
 548                                   min(action->rate,
 549                                       sg_tcp_gamma / (2.0 *
 550                                                       action->lat_current)));
 551
 552         if (action->rate < sg_tcp_gamma / (2.0 * action->lat_current)) {
 553           XBT_INFO("Flow is limited BYBANDWIDTH");
 554         } else {
 555           XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 556                 action->lat_current);
 557         }
 558       }
 559       if (!(action->suspended))
 560         lmm_update_variable_weight(network_maxmin_system, action->variable,
 561                                    action->weight);
 562
 563     }
 564     if (tmgr_trace_event_free(event_type))
 565       nw_link->lat_event = NULL;
 566   } else if (event_type == nw_link->lmm_resource.state_event) {
 567     if (value > 0)
 568       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 569     else {
 570       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 571       lmm_variable_t var = NULL;
 572       lmm_element_t elem = NULL;
 573
 574       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 575       while ((var = lmm_get_var_from_cnst
 576               (network_maxmin_system, cnst, &elem))) {
 577         surf_action_t action = lmm_variable_id(var);
 578
 579         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 580             surf_action_state_get(action) == SURF_ACTION_READY) {
 581           action->finish = date;
 582           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 583         }
 584       }
 585     }
 586     if (tmgr_trace_event_free(event_type))
 587       nw_link->lmm_resource.state_event = NULL;
 588   } else {
 589     XBT_CRITICAL("Unknown event ! \n");
 590     xbt_abort();
 591   }
 592
 593   return;
 594 }
 595
 596
 597 static surf_action_t net_communicate(const char *src_name,
 598                                      const char *dst_name, double size,
 599                                      double rate)
 600 {
 601   unsigned int i;
 602   link_CM02_t link;
 603   int failed = 0;
 604   surf_action_network_CM02_t action = NULL;
 605   double bandwidth_bound;
 606   double latency=0.0;
 607   /* LARGE PLATFORMS HACK:
 608      Add a link_CM02_t *link and a int link_nb to network_card_CM02_t. It will represent local links for this node
 609      Use the cluster_id for ->id */
 610
 611   xbt_dynar_t back_route = NULL;
 612   int constraints_per_variable = 0;
 613   // I will need this route for some time so let's call get_route_no_cleanup
 614   xbt_dynar_t route = global_routing->get_route_no_cleanup(src_name, dst_name);
 615
 616
 617   if (sg_network_fullduplex == 1) {
 618     back_route = global_routing->get_route(dst_name, src_name);
 619   }
 620
 621   /* LARGE PLATFORMS HACK:
 622      total_route_size = route_size + src->link_nb + dst->nb */
 623
 624   XBT_IN("(%s,%s,%g,%g)", src_name, dst_name, size, rate);
 625   /* LARGE PLATFORMS HACK:
 626      assert on total_route_size */
 627   latency = global_routing->get_latency(src_name,dst_name);
 628   xbt_assert2(xbt_dynar_length(route) || latency,
 629               "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 630               src_name, dst_name);
 631
 632   xbt_dynar_foreach(route, i, link) {
 633     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 634       failed = 1;
 635       break;
 636     }
 637   }
 638   action =
 639       surf_action_new(sizeof(s_surf_action_network_CM02_t), size,
 640                       surf_network_model, failed);
 641 #ifdef HAVE_LATENCY_BOUND_TRACKING
 642   (action->generic_action).latency_limited = 0;
 643 #endif
 644   action->weight = action->latency = latency;
 645
 646   xbt_swag_insert(action, action->generic_action.state_set);
 647   action->rate = rate;
 648
 649   bandwidth_bound = -1.0;
 650
 651   xbt_dynar_foreach(route, i, link) {
 652     action->weight +=
 653         sg_weight_S_parameter /
 654         (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 655     if (bandwidth_bound < 0.0)
 656       bandwidth_bound =
 657           (*bandwidth_factor_callback) (size) *
 658           (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 659     else
 660       bandwidth_bound =
 661           min(bandwidth_bound,
 662               (*bandwidth_factor_callback) (size) *
 663               (link->lmm_resource.power.peak *
 664                link->lmm_resource.power.scale));
 665   }
 666   /* LARGE PLATFORMS HACK:
 667      Add src->link and dst->link latencies */
 668   action->lat_current = action->latency;
 669   action->latency *= (*latency_factor_callback) (size);
 670   action->rate =
 671       (*bandwidth_constraint_callback) (action->rate, bandwidth_bound,
 672                                         size);
 673
 674   if(xbt_dynar_length(route) > 0) {
 675     link = *(link_CM02_t*)xbt_dynar_get_ptr(route, 0);
 676     gap_append(size, link, action);
 677     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 678            action, src_name, dst_name, action->sender.gap, action->latency);
 679   } else {
 680     gap_unknown(action);
 681   }
 682
 683
 684   /* LARGE PLATFORMS HACK:
 685      lmm_variable_new(..., total_route_size) */
 686   if (back_route != NULL) {
 687     constraints_per_variable =
 688         xbt_dynar_length(route) + xbt_dynar_length(back_route);
 689   } else {
 690     constraints_per_variable = xbt_dynar_length(route);
 691   }
 692
 693   if (action->latency > 0)
 694     action->variable =
 695         lmm_variable_new(network_maxmin_system, action, 0.0, -1.0,
 696                          constraints_per_variable);
 697   else
 698     action->variable =
 699         lmm_variable_new(network_maxmin_system, action, 1.0, -1.0,
 700                          constraints_per_variable);
 701
 702   if (action->rate < 0) {
 703     if (action->lat_current > 0)
 704       lmm_update_variable_bound(network_maxmin_system, action->variable,
 705                                 sg_tcp_gamma / (2.0 *
 706                                                 action->lat_current));
 707     else
 708       lmm_update_variable_bound(network_maxmin_system, action->variable,
 709                                 -1.0);
 710   } else {
 711     if (action->lat_current > 0)
 712       lmm_update_variable_bound(network_maxmin_system, action->variable,
 713                                 min(action->rate,
 714                                     sg_tcp_gamma / (2.0 *
 715                                                     action->lat_current)));
 716     else
 717       lmm_update_variable_bound(network_maxmin_system, action->variable,
 718                                 action->rate);
 719   }
 720
 721   xbt_dynar_foreach(route, i, link) {
 722     lmm_expand(network_maxmin_system, link->lmm_resource.constraint,
 723                action->variable, 1.0);
 724   }
 725
 726   if (sg_network_fullduplex == 1) {
 727     XBT_DEBUG("Fullduplex active adding backward flow using 5%c", '%');
 728     xbt_dynar_foreach(back_route, i, link) {
 729       lmm_expand(network_maxmin_system, link->lmm_resource.constraint,
 730                  action->variable, .05);
 731     }
 732   }
 733   /* LARGE PLATFORMS HACK:
 734      expand also with src->link and dst->link */
 735 #ifdef HAVE_TRACING
 736   action->src_name = xbt_strdup(src_name);
 737
 738   action->dst_name = xbt_strdup(dst_name);
 739 #endif
 740
 741   xbt_dynar_free(&route);
 742   XBT_OUT();
 743
 744   return (surf_action_t) action;
 745 }
 746
 747 static xbt_dynar_t net_get_route(const char *src, const char *dst)
 748 {
 749   return global_routing->get_route(src, dst);
 750 }
 751
 752 static double net_get_link_bandwidth(const void *link)
 753 {
 754   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 755   return lmm->power.peak * lmm->power.scale;
 756 }
 757
 758 static double net_get_link_latency(const void *link)
 759 {
 760   return ((link_CM02_t) link)->lat_current;
 761 }
 762
 763 static int net_link_shared(const void *link)
 764 {
 765   return
 766       lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 767 }
 768
 769 static void net_action_suspend(surf_action_t action)
 770 {
 771   ((surf_action_network_CM02_t) action)->suspended = 1;
 772   lmm_update_variable_weight(network_maxmin_system,
 773                              ((surf_action_network_CM02_t)
 774                               action)->variable, 0.0);
 775 }
 776
 777 static void net_action_resume(surf_action_t action)
 778 {
 779   if (((surf_action_network_CM02_t) action)->suspended) {
 780     lmm_update_variable_weight(network_maxmin_system,
 781                                ((surf_action_network_CM02_t)
 782                                 action)->variable,
 783                                ((surf_action_network_CM02_t)
 784                                 action)->weight);
 785     ((surf_action_network_CM02_t) action)->suspended = 0;
 786   }
 787 }
 788
 789 static int net_action_is_suspended(surf_action_t action)
 790 {
 791   return ((surf_action_network_CM02_t) action)->suspended;
 792 }
 793
 794 void net_action_set_max_duration(surf_action_t action, double duration)
 795 {
 796   action->max_duration = duration;
 797 }
 798
 799 #ifdef HAVE_TRACING
 800 static void net_action_set_category(surf_action_t action, const char *category)
 801 {
 802   action->category = xbt_strdup (category);
 803 }
 804 #endif
 805
 806 static void net_finalize(void)
 807 {
 808   surf_model_exit(surf_network_model);
 809   surf_network_model = NULL;
 810
 811   global_routing->finalize();
 812
 813   lmm_system_free(network_maxmin_system);
 814   network_maxmin_system = NULL;
 815 }
 816
 817 static void surf_network_model_init_internal(void)
 818 {
 819   surf_network_model = surf_model_init();
 820
 821   surf_network_model->name = "network";
 822   surf_network_model->action_unref = net_action_unref;
 823   surf_network_model->action_cancel = net_action_cancel;
 824   surf_network_model->action_recycle = net_action_recycle;
 825   surf_network_model->get_remains = net_action_get_remains;
 826 #ifdef HAVE_LATENCY_BOUND_TRACKING
 827   surf_network_model->get_latency_limited = net_get_link_latency_limited;
 828 #endif
 829
 830   surf_network_model->model_private->resource_used = net_resource_used;
 831   surf_network_model->model_private->share_resources = net_share_resources;
 832   surf_network_model->model_private->update_actions_state =
 833       net_update_actions_state;
 834   surf_network_model->model_private->update_resource_state =
 835       net_update_resource_state;
 836   surf_network_model->model_private->finalize = net_finalize;
 837
 838   surf_network_model->suspend = net_action_suspend;
 839   surf_network_model->resume = net_action_resume;
 840   surf_network_model->is_suspended = net_action_is_suspended;
 841   surf_network_model->set_max_duration = net_action_set_max_duration;
 842 #ifdef HAVE_TRACING
 843   surf_network_model->set_category = net_action_set_category;
 844 #endif
 845
 846   surf_network_model->extension.network.communicate = net_communicate;
 847   surf_network_model->extension.network.get_route = net_get_route;
 848   surf_network_model->extension.network.get_link_bandwidth =
 849       net_get_link_bandwidth;
 850   surf_network_model->extension.network.get_link_latency =
 851       net_get_link_latency;
 852   surf_network_model->extension.network.link_shared = net_link_shared;
 853   surf_network_model->extension.network.add_traces = net_add_traces;
 854   surf_network_model->extension.network.create_resource =
 855       net_create_resource;
 856
 857   if (!network_maxmin_system)
 858     network_maxmin_system = lmm_system_new();
 859
 860   routing_model_create(sizeof(link_CM02_t),
 861                        net_link_new(xbt_strdup("__loopback__"),
 862                                     498000000, NULL, 0.000015, NULL,
 863                                     SURF_RESOURCE_ON, NULL,
 864                                     SURF_LINK_FATPIPE, NULL),
 865                        net_get_link_latency);
 866 }
 867
 868
 869
 870 /************************************************************************/
 871 /* New model based on LV08 and experimental results of MPI ping-pongs   */
 872 /************************************************************************/
 873 void surf_network_model_init_SMPI(const char *filename)
 874 {
 875
 876   if (surf_network_model)
 877     return;
 878   surf_network_model_init_internal();
 879   latency_factor_callback = &smpi_latency_factor;
 880   bandwidth_factor_callback = &smpi_bandwidth_factor;
 881   bandwidth_constraint_callback = &smpi_bandwidth_constraint;
 882   net_define_callbacks(filename);
 883   xbt_dynar_push(model_list, &surf_network_model);
 884   network_solve = lmm_solve;
 885
 886   xbt_cfg_setdefault_double(_surf_cfg_set, "network/sender_gap", 10e-6);
 887   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 888
 889   update_model_description(surf_network_model_description,
 890                            "SMPI", surf_network_model);
 891 }
 892
 893 /************************************************************************/
 894 /* New model based on optimizations discussed during this thesis        */
 895 /************************************************************************/
 896 void surf_network_model_init_LegrandVelho(const char *filename)
 897 {
 898
 899   if (surf_network_model)
 900     return;
 901   surf_network_model_init_internal();
 902   net_define_callbacks(filename);
 903   xbt_dynar_push(model_list, &surf_network_model);
 904   network_solve = lmm_solve;
 905
 906   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 907   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 908                             0.92);
 909   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 910
 911   update_model_description(surf_network_model_description,
 912                            "LV08", surf_network_model);
 913 }
 914
 915 /***************************************************************************/
 916 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 917 /***************************************************************************/
 918 /* @TechReport{      rr-lip2002-40, */
 919 /*   author        = {Henri Casanova and Loris Marchal}, */
 920 /*   institution   = {LIP}, */
 921 /*   title         = {A Network Model for Simulation of Grid Application}, */
 922 /*   number        = {2002-40}, */
 923 /*   month         = {oct}, */
 924 /*   year          = {2002} */
 925 /* } */
 926 void surf_network_model_init_CM02(const char *filename)
 927 {
 928
 929   if (surf_network_model)
 930     return;
 931   surf_network_model_init_internal();
 932   net_define_callbacks(filename);
 933   xbt_dynar_push(model_list, &surf_network_model);
 934   network_solve = lmm_solve;
 935
 936   update_model_description(surf_network_model_description,
 937                            "CM02", surf_network_model);
 938 }
 939
 940 void surf_network_model_init_Reno(const char *filename)
 941 {
 942   if (surf_network_model)
 943     return;
 944   surf_network_model_init_internal();
 945   net_define_callbacks(filename);
 946
 947   xbt_dynar_push(model_list, &surf_network_model);
 948   lmm_set_default_protocol_function(func_reno_f, func_reno_fp,
 949                                     func_reno_fpi);
 950   network_solve = lagrange_solve;
 951
 952   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 953   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 954                             0.92);
 955   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 956
 957   update_model_description(surf_network_model_description,
 958                            "Reno", surf_network_model);
 959 }
 960
 961
 962 void surf_network_model_init_Reno2(const char *filename)
 963 {
 964   if (surf_network_model)
 965     return;
 966   surf_network_model_init_internal();
 967   net_define_callbacks(filename);
 968
 969   xbt_dynar_push(model_list, &surf_network_model);
 970   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 971                                     func_reno2_fpi);
 972   network_solve = lagrange_solve;
 973
 974   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 975   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 976                             0.92);
 977   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S_parameter",
 978                             8775);
 979
 980   update_model_description(surf_network_model_description,
 981                            "Reno2", surf_network_model);
 982 }
 983
 984 void surf_network_model_init_Vegas(const char *filename)
 985 {
 986   if (surf_network_model)
 987     return;
 988   surf_network_model_init_internal();
 989   net_define_callbacks(filename);
 990
 991   xbt_dynar_push(model_list, &surf_network_model);
 992   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 993                                     func_vegas_fpi);
 994   network_solve = lagrange_solve;
 995
 996   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 997   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 998                             0.92);
 999   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
1000
1001   update_model_description(surf_network_model_description,
1002                            "Vegas", surf_network_model);
1003 }