src/surf/network.c

   1 /* Copyright (c) 2004-2011. 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 #include "surf/surfxml_parse_values.h"
  12 #include "surf/surf_resource.h"
  13 #include "surf/surf_resource_lmm.h"
  14
  15
  16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_network, surf,
  17                                 "Logging specific to the SURF network module");
  18
  19 surf_model_t surf_network_model = NULL;
  20 static lmm_system_t network_maxmin_system = NULL;
  21 static void (*network_solve) (lmm_system_t) = NULL;
  22
  23 double sg_sender_gap = 0.0;
  24 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
  25 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
  26 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
  27
  28 double sg_tcp_gamma = 0.0;
  29 int sg_network_fullduplex = 0;
  30
  31 xbt_dict_t gap_lookup = NULL;
  32
  33 static double net_get_link_bandwidth(const void *link);
  34
  35 static void gap_append(double size, const link_CM02_t link, surf_action_network_CM02_t action) {
  36    const char* src = link->lmm_resource.generic_resource.name;
  37    xbt_fifo_t fifo;
  38    surf_action_network_CM02_t last_action;
  39    double bw;
  40
  41    if(sg_sender_gap > 0.0) {
  42       if(!gap_lookup) {
  43          gap_lookup = xbt_dict_new();
  44       }
  45       fifo = (xbt_fifo_t)xbt_dict_get_or_null(gap_lookup, src);
  46       action->sender.gap = 0.0;
  47       if(fifo && xbt_fifo_size(fifo) > 0) {
  48          /* Compute gap from last send */
  49          last_action = (surf_action_network_CM02_t)xbt_fifo_get_item_content(xbt_fifo_get_last_item(fifo));
  50          bw = net_get_link_bandwidth(link);
  51          action->sender.gap = last_action->sender.gap + max(sg_sender_gap, last_action->sender.size / bw);
  52          action->latency += action->sender.gap;
  53       }
  54       /* Append action as last send */
  55       action->sender.link_name = link->lmm_resource.generic_resource.name;
  56       fifo = (xbt_fifo_t)xbt_dict_get_or_null(gap_lookup, action->sender.link_name);
  57       if(!fifo) {
  58          fifo = xbt_fifo_new();
  59          xbt_dict_set(gap_lookup, action->sender.link_name, fifo, NULL);
  60       }
  61       action->sender.fifo_item = xbt_fifo_push(fifo, action);
  62       action->sender.size = size;
  63    }
  64 }
  65
  66 static void gap_unknown(surf_action_network_CM02_t action) {
  67    action->sender.gap = 0.0;
  68    action->sender.link_name = NULL;
  69    action->sender.fifo_item = NULL;
  70    action->sender.size = 0.0;
  71 }
  72
  73 static void gap_remove(surf_action_network_CM02_t action) {
  74    xbt_fifo_t fifo;
  75    size_t size;
  76
  77    if(sg_sender_gap > 0.0 && action->sender.link_name && action->sender.fifo_item) {
  78       fifo = (xbt_fifo_t)xbt_dict_get_or_null(gap_lookup, action->sender.link_name);
  79       xbt_fifo_remove_item(fifo, action->sender.fifo_item);
  80       size = xbt_fifo_size(fifo);
  81       if(size == 0) {
  82          xbt_fifo_free(fifo);
  83          xbt_dict_remove(gap_lookup, action->sender.link_name);
  84          size = xbt_dict_length(gap_lookup);
  85          if(size == 0) {
  86             xbt_dict_free(&gap_lookup);
  87          }
  88       }
  89    }
  90 }
  91
  92 /******************************************************************************/
  93 /*                           Factors callbacks                                */
  94 /******************************************************************************/
  95 static double constant_latency_factor(double size)
  96 {
  97   return sg_latency_factor;
  98 }
  99
 100 static double constant_bandwidth_factor(double size)
 101 {
 102   return sg_bandwidth_factor;
 103 }
 104
 105 static double constant_bandwidth_constraint(double rate, double bound,
 106                                             double size)
 107 {
 108   return rate;
 109 }
 110
 111 /**********************/
 112 /*   SMPI callbacks   */
 113 /**********************/
 114 static double smpi_latency_factor(double size)
 115 {
 116   /* 1 B <= size <= 1 KiB */
 117   if (size <= 1024.0) {
 118     return 1.0056;
 119   }
 120
 121   /* 2 KiB <= size <= 32 KiB */
 122   if (size <= 32768.0) {
 123     return 1.8805;
 124   }
 125
 126   /* 64 KiB <= size <= 4 MiB */
 127   return 22.7111;
 128 }
 129
 130 static double smpi_bandwidth_factor(double size)
 131 {
 132   /* 1 B <= size <= 1 KiB */
 133   if (size <= 1024.0) {
 134     return 0.2758;
 135   }
 136
 137   /* 2 KiB <= size <= 32 KiB */
 138   if (size <= 32768.0) {
 139     return 0.5477;
 140   }
 141
 142   /* 64 KiB <= size <= 4 MiB */
 143   return 0.9359;
 144 }
 145
 146 static double smpi_bandwidth_constraint(double rate, double bound,
 147                                         double size)
 148 {
 149   return rate < 0 ? bound : min(bound, rate * smpi_bandwidth_factor(size));
 150 }
 151
 152
 153 static double (*latency_factor_callback) (double) =
 154     &constant_latency_factor;
 155 static double (*bandwidth_factor_callback) (double) =
 156     &constant_bandwidth_factor;
 157 static double (*bandwidth_constraint_callback) (double, double, double) =
 158     &constant_bandwidth_constraint;
 159
 160
 161 static void* net_create_resource(const char *name,
 162                                 double bw_initial,
 163                                 tmgr_trace_t bw_trace,
 164                                 double lat_initial,
 165                                 tmgr_trace_t lat_trace,
 166                                 e_surf_resource_state_t
 167                                 state_initial,
 168                                 tmgr_trace_t state_trace,
 169                                 e_surf_link_sharing_policy_t
 170                                 policy, xbt_dict_t properties)
 171 {
 172   link_CM02_t nw_link = (link_CM02_t)
 173       surf_resource_lmm_new(sizeof(s_link_CM02_t),
 174                             surf_network_model, name, properties,
 175                             network_maxmin_system,
 176                             sg_bandwidth_factor * bw_initial,
 177                             history,
 178                             state_initial, state_trace,
 179                             bw_initial, bw_trace);
 180
 181   xbt_assert(!xbt_lib_get_or_null(link_lib, name, SURF_LINK_LEVEL),
 182               "Link '%s' declared several times in the platform file.",
 183               name);
 184
 185   nw_link->lat_current = lat_initial;
 186   if (lat_trace)
 187     nw_link->lat_event =
 188         tmgr_history_add_trace(history, lat_trace, 0.0, 0, nw_link);
 189
 190   if (policy == SURF_LINK_FATPIPE)
 191     lmm_constraint_shared(nw_link->lmm_resource.constraint);
 192
 193   xbt_lib_set(link_lib, name, SURF_LINK_LEVEL, nw_link);
 194
 195   return nw_link;
 196 }
 197
 198 static void net_parse_link_init(sg_platf_link_cbarg_t link)
 199 {
 200   XBT_DEBUG("link_CM02");
 201
 202   if (link->policy == SURF_LINK_FULLDUPLEX) {
 203     char *link_id;
 204     link_id = bprintf("%s_UP", link->id);
 205     net_create_resource(link_id,
 206                         link->bandwidth,
 207                         link->bandwidth_trace,
 208                         link->latency,
 209                         link->latency_trace,
 210                         link->state,
 211                         link->state_trace,
 212                         link->policy,
 213                         link->properties);
 214     xbt_free(link_id);
 215     link_id = bprintf("%s_DOWN", link->id);
 216     net_create_resource(link_id,
 217                         link->bandwidth,
 218                         link->bandwidth_trace,
 219                         link->latency,
 220                         link->latency_trace,
 221                         link->state,
 222                         link->state_trace,
 223                         link->policy,
 224                         NULL); /* FIXME: We need to deep copy the properties or
 225                                 * we won't be able to free it */
 226     xbt_free(link_id);
 227   } else {
 228     net_create_resource(link->id,
 229                         link->bandwidth,
 230                         link->bandwidth_trace,
 231                         link->latency,
 232                         link->latency_trace,
 233                         link->state,
 234                         link->state_trace,
 235                         link->policy,
 236                         link->properties);
 237   }
 238 }
 239
 240 static void net_add_traces(void)
 241 {
 242   xbt_dict_cursor_t cursor = NULL;
 243   char *trace_name, *elm;
 244
 245   static int called = 0;
 246   if (called)
 247     return;
 248   called = 1;
 249
 250   /* connect all traces relative to network */
 251   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 252     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 253     link_CM02_t link =
 254         xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 255
 256     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 257                 trace_name, elm);
 258     xbt_assert(trace,
 259                 "Cannot connect trace %s to link %s: trace undefined",
 260                 trace_name, elm);
 261
 262     link->lmm_resource.state_event =
 263         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 264   }
 265
 266   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 267     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 268     link_CM02_t link =
 269                 xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 270
 271     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 272                 trace_name, elm);
 273     xbt_assert(trace,
 274                 "Cannot connect trace %s to link %s: trace undefined",
 275                 trace_name, elm);
 276
 277     link->lmm_resource.power.event =
 278         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 279   }
 280
 281   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 282     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 283     link_CM02_t link =
 284                 xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 285
 286     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 287                 trace_name, elm);
 288     xbt_assert(trace,
 289                 "Cannot connect trace %s to link %s: trace undefined",
 290                 trace_name, elm);
 291
 292     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 293   }
 294 }
 295
 296 static void net_define_callbacks(void)
 297 {
 298   /* Figuring out the network links */
 299   sg_platf_link_add_cb(net_parse_link_init);
 300   sg_platf_postparse_add_cb(net_add_traces);
 301 }
 302
 303 static int net_resource_used(void *resource_id)
 304 {
 305   return lmm_constraint_used(network_maxmin_system,
 306                              ((surf_resource_lmm_t)
 307                               resource_id)->constraint);
 308 }
 309
 310 static int net_action_unref(surf_action_t action)
 311 {
 312   action->refcount--;
 313   if (!action->refcount) {
 314     xbt_swag_remove(action, action->state_set);
 315     if (((surf_action_network_CM02_t) action)->variable)
 316       lmm_variable_free(network_maxmin_system,
 317                         ((surf_action_network_CM02_t) action)->variable);
 318 #ifdef HAVE_TRACING
 319     xbt_free(((surf_action_network_CM02_t) action)->src_name);
 320     xbt_free(((surf_action_network_CM02_t) action)->dst_name);
 321     xbt_free(action->category);
 322 #endif
 323     surf_action_free(&action);
 324     return 1;
 325   }
 326   return 0;
 327 }
 328
 329 static void net_action_cancel(surf_action_t action)
 330 {
 331   surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 332 }
 333
 334 void net_action_recycle(surf_action_t action)
 335 {
 336   return;
 337 }
 338
 339 #ifdef HAVE_LATENCY_BOUND_TRACKING
 340 int net_get_link_latency_limited(surf_action_t action)
 341 {
 342   return action->latency_limited;
 343 }
 344 #endif
 345
 346 double net_action_get_remains(surf_action_t action)
 347 {
 348   return action->remains;
 349 }
 350
 351 static double net_share_resources(double now)
 352 {
 353   s_surf_action_network_CM02_t s_action;
 354   surf_action_network_CM02_t action = NULL;
 355   xbt_swag_t running_actions =
 356       surf_network_model->states.running_action_set;
 357   double min;
 358
 359   min = generic_maxmin_share_resources(running_actions,
 360                                        xbt_swag_offset(s_action,
 361                                                        variable),
 362                                        network_maxmin_system,
 363                                        network_solve);
 364
 365 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 366
 367   xbt_swag_foreach(action, running_actions) {
 368 #ifdef HAVE_LATENCY_BOUND_TRACKING
 369     if (lmm_is_variable_limited_by_latency(action->variable)) {
 370       (action->generic_action).latency_limited = 1;
 371     } else {
 372       (action->generic_action).latency_limited = 0;
 373     }
 374 #endif
 375     if (action->latency > 0) {
 376       if (min < 0)
 377         min = action->latency;
 378       else if (action->latency < min)
 379         min = action->latency;
 380     }
 381   }
 382
 383   XBT_DEBUG("Min of share resources %f", min);
 384
 385   return min;
 386 }
 387
 388 static void net_update_actions_state(double now, double delta)
 389 {
 390   double deltap = 0.0;
 391   surf_action_network_CM02_t action = NULL;
 392   surf_action_network_CM02_t next_action = NULL;
 393   xbt_swag_t running_actions =
 394       surf_network_model->states.running_action_set;
 395   /*
 396      xbt_swag_t failed_actions =
 397      surf_network_model->states.failed_action_set;
 398    */
 399
 400   xbt_swag_foreach_safe(action, next_action, running_actions) {
 401     deltap = delta;
 402     if (action->latency > 0) {
 403       if (action->latency > deltap) {
 404         double_update(&(action->latency), deltap);
 405         deltap = 0.0;
 406       } else {
 407         double_update(&(deltap), action->latency);
 408         action->latency = 0.0;
 409       }
 410       if ((action->latency == 0.0) && !(action->suspended))
 411         lmm_update_variable_weight(network_maxmin_system, action->variable,
 412                                    action->weight);
 413     }
 414 #ifdef HAVE_TRACING
 415     if (TRACE_is_enabled()) {
 416       xbt_dynar_t route = routing_get_route(action->src_name, action->dst_name);
 417       link_CM02_t link;
 418       unsigned int i;
 419       xbt_dynar_foreach(route, i, link) {
 420         TRACE_surf_link_set_utilization(link->lmm_resource.generic_resource.name,
 421                                         action->generic_action.data,
 422                                         (surf_action_t) action,
 423                                         lmm_variable_getvalue
 424                                         (action->variable), now - delta,
 425                                         delta);
 426       }
 427     }
 428 #endif
 429     if(!lmm_get_number_of_cnst_from_var(network_maxmin_system, action->variable)) {
 430                                 /* There is actually no link used, hence an infinite bandwidth.
 431                                  * This happens often when using models like vivaldi.
 432                                  * In such case, just make sure that the action completes immediately.
 433                                  */
 434         double_update(&(action->generic_action.remains),
 435                         action->generic_action.remains);
 436     }
 437     double_update(&(action->generic_action.remains),
 438                   lmm_variable_getvalue(action->variable) * deltap);
 439     if (action->generic_action.max_duration != NO_MAX_DURATION)
 440       double_update(&(action->generic_action.max_duration), delta);
 441
 442     if ((action->generic_action.remains <= 0) &&
 443         (lmm_get_variable_weight(action->variable) > 0)) {
 444       action->generic_action.finish = surf_get_clock();
 445       surf_network_model->action_state_set((surf_action_t) action,
 446                                            SURF_ACTION_DONE);
 447       gap_remove(action);
 448     } else if ((action->generic_action.max_duration != NO_MAX_DURATION)
 449                && (action->generic_action.max_duration <= 0)) {
 450       action->generic_action.finish = surf_get_clock();
 451       surf_network_model->action_state_set((surf_action_t) action,
 452                                            SURF_ACTION_DONE);
 453       gap_remove(action);
 454     }
 455   }
 456
 457   return;
 458 }
 459
 460 static void net_update_resource_state(void *id,
 461                                       tmgr_trace_event_t event_type,
 462                                       double value, double date)
 463 {
 464   link_CM02_t nw_link = id;
 465   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 466   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 467   /*     value, event_type); */
 468
 469   if (event_type == nw_link->lmm_resource.power.event) {
 470     double delta =
 471         sg_weight_S_parameter / value - sg_weight_S_parameter /
 472         (nw_link->lmm_resource.power.peak *
 473          nw_link->lmm_resource.power.scale);
 474     lmm_variable_t var = NULL;
 475     lmm_element_t elem = NULL;
 476     surf_action_network_CM02_t action = NULL;
 477
 478     nw_link->lmm_resource.power.peak = value;
 479     lmm_update_constraint_bound(network_maxmin_system,
 480                                 nw_link->lmm_resource.constraint,
 481                                 sg_bandwidth_factor *
 482                                 (nw_link->lmm_resource.power.peak *
 483                                  nw_link->lmm_resource.power.scale));
 484 #ifdef HAVE_TRACING
 485     TRACE_surf_link_set_bandwidth(date, nw_link->lmm_resource.generic_resource.name,
 486                                   sg_bandwidth_factor *
 487                                   (nw_link->lmm_resource.power.peak *
 488                                    nw_link->lmm_resource.power.scale));
 489 #endif
 490     if (sg_weight_S_parameter > 0) {
 491       while ((var = lmm_get_var_from_cnst
 492               (network_maxmin_system, nw_link->lmm_resource.constraint,
 493                &elem))) {
 494         action = lmm_variable_id(var);
 495         action->weight += delta;
 496         if (!(action->suspended))
 497           lmm_update_variable_weight(network_maxmin_system,
 498                                      action->variable, action->weight);
 499       }
 500     }
 501     if (tmgr_trace_event_free(event_type))
 502       nw_link->lmm_resource.power.event = NULL;
 503   } else if (event_type == nw_link->lat_event) {
 504     double delta = value - nw_link->lat_current;
 505     lmm_variable_t var = NULL;
 506     lmm_element_t elem = NULL;
 507     surf_action_network_CM02_t action = NULL;
 508
 509     nw_link->lat_current = value;
 510     while ((var = lmm_get_var_from_cnst
 511             (network_maxmin_system, nw_link->lmm_resource.constraint,
 512              &elem))) {
 513       action = lmm_variable_id(var);
 514       action->lat_current += delta;
 515       action->weight += delta;
 516       if (action->rate < 0)
 517         lmm_update_variable_bound(network_maxmin_system, action->variable,
 518                                   sg_tcp_gamma / (2.0 *
 519                                                   action->lat_current));
 520       else {
 521         lmm_update_variable_bound(network_maxmin_system, action->variable,
 522                                   min(action->rate,
 523                                       sg_tcp_gamma / (2.0 *
 524                                                       action->lat_current)));
 525
 526         if (action->rate < sg_tcp_gamma / (2.0 * action->lat_current)) {
 527           XBT_INFO("Flow is limited BYBANDWIDTH");
 528         } else {
 529           XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 530                 action->lat_current);
 531         }
 532       }
 533       if (!(action->suspended))
 534         lmm_update_variable_weight(network_maxmin_system, action->variable,
 535                                    action->weight);
 536
 537     }
 538     if (tmgr_trace_event_free(event_type))
 539       nw_link->lat_event = NULL;
 540   } else if (event_type == nw_link->lmm_resource.state_event) {
 541     if (value > 0)
 542       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 543     else {
 544       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 545       lmm_variable_t var = NULL;
 546       lmm_element_t elem = NULL;
 547
 548       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 549       while ((var = lmm_get_var_from_cnst
 550               (network_maxmin_system, cnst, &elem))) {
 551         surf_action_t action = lmm_variable_id(var);
 552
 553         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 554             surf_action_state_get(action) == SURF_ACTION_READY) {
 555           action->finish = date;
 556           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 557         }
 558       }
 559     }
 560     if (tmgr_trace_event_free(event_type))
 561       nw_link->lmm_resource.state_event = NULL;
 562   } else {
 563     XBT_CRITICAL("Unknown event ! \n");
 564     xbt_abort();
 565   }
 566
 567   return;
 568 }
 569
 570
 571 static surf_action_t net_communicate(const char *src_name,
 572                                      const char *dst_name, double size,
 573                                      double rate)
 574 {
 575   unsigned int i;
 576   link_CM02_t link;
 577   int failed = 0;
 578   surf_action_network_CM02_t action = NULL;
 579   double bandwidth_bound;
 580   double latency=0.0;
 581   /* LARGE PLATFORMS HACK:
 582      Add a link_CM02_t *link and a int link_nb to network_card_CM02_t. It will represent local links for this node
 583      Use the cluster_id for ->id */
 584
 585   xbt_dynar_t back_route = NULL;
 586   int constraints_per_variable = 0;
 587   xbt_dynar_t route;
 588   // I need to have the forward and backward routes at the same time, so I don't ask the routing to cleanup the route right away for me
 589   routing_get_route_and_latency(src_name, dst_name, &route, &latency, 0);
 590
 591   if (sg_network_fullduplex == 1) {
 592     back_route = routing_get_route(dst_name, src_name);
 593   }
 594
 595   /* LARGE PLATFORMS HACK:
 596      total_route_size = route_size + src->link_nb + dst->nb */
 597
 598   XBT_IN("(%s,%s,%g,%g)", src_name, dst_name, size, rate);
 599   /* LARGE PLATFORMS HACK:
 600      assert on total_route_size */
 601   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 602               "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 603               src_name, dst_name);
 604
 605   xbt_dynar_foreach(route, i, link) {
 606     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 607       failed = 1;
 608       break;
 609     }
 610   }
 611   action =
 612       surf_action_new(sizeof(s_surf_action_network_CM02_t), size,
 613                       surf_network_model, failed);
 614 #ifdef HAVE_LATENCY_BOUND_TRACKING
 615   (action->generic_action).latency_limited = 0;
 616 #endif
 617   action->weight = action->latency = latency;
 618
 619   xbt_swag_insert(action, action->generic_action.state_set);
 620   action->rate = rate;
 621
 622   bandwidth_bound = -1.0;
 623
 624   xbt_dynar_foreach(route, i, link) {
 625     action->weight +=
 626         sg_weight_S_parameter /
 627         (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 628     if (bandwidth_bound < 0.0)
 629       bandwidth_bound =
 630           bandwidth_factor_callback(size) *
 631           (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 632     else
 633       bandwidth_bound =
 634           min(bandwidth_bound,
 635               bandwidth_factor_callback(size) *
 636               (link->lmm_resource.power.peak *
 637                link->lmm_resource.power.scale));
 638   }
 639   /* LARGE PLATFORMS HACK:
 640      Add src->link and dst->link latencies */
 641   action->lat_current = action->latency;
 642   action->latency *= latency_factor_callback(size);
 643   action->rate =
 644       bandwidth_constraint_callback(action->rate, bandwidth_bound,
 645                                         size);
 646
 647   if(!xbt_dynar_is_empty(route)) {
 648     link = *(link_CM02_t*)xbt_dynar_get_ptr(route, 0);
 649     gap_append(size, link, action);
 650     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 651            action, src_name, dst_name, action->sender.gap, action->latency);
 652   } else {
 653     gap_unknown(action);
 654   }
 655
 656
 657   /* LARGE PLATFORMS HACK:
 658      lmm_variable_new(..., total_route_size) */
 659   if (back_route != NULL) {
 660     constraints_per_variable =
 661         xbt_dynar_length(route) + xbt_dynar_length(back_route);
 662   } else {
 663     constraints_per_variable = xbt_dynar_length(route);
 664   }
 665
 666   if (action->latency > 0)
 667     action->variable =
 668         lmm_variable_new(network_maxmin_system, action, 0.0, -1.0,
 669                          constraints_per_variable);
 670   else
 671     action->variable =
 672         lmm_variable_new(network_maxmin_system, action, 1.0, -1.0,
 673                          constraints_per_variable);
 674
 675   if (action->rate < 0) {
 676     if (action->lat_current > 0)
 677       lmm_update_variable_bound(network_maxmin_system, action->variable,
 678                                 sg_tcp_gamma / (2.0 *
 679                                                 action->lat_current));
 680     else
 681       lmm_update_variable_bound(network_maxmin_system, action->variable,
 682                                 -1.0);
 683   } else {
 684     if (action->lat_current > 0)
 685       lmm_update_variable_bound(network_maxmin_system, action->variable,
 686                                 min(action->rate,
 687                                     sg_tcp_gamma / (2.0 *
 688                                                     action->lat_current)));
 689     else
 690       lmm_update_variable_bound(network_maxmin_system, action->variable,
 691                                 action->rate);
 692   }
 693
 694   xbt_dynar_foreach(route, i, link) {
 695     lmm_expand(network_maxmin_system, link->lmm_resource.constraint,
 696                action->variable, 1.0);
 697   }
 698
 699   if (sg_network_fullduplex == 1) {
 700     XBT_DEBUG("Fullduplex active adding backward flow using 5%c", '%');
 701     xbt_dynar_foreach(back_route, i, link) {
 702       lmm_expand(network_maxmin_system, link->lmm_resource.constraint,
 703                  action->variable, .05);
 704     }
 705   }
 706   /* LARGE PLATFORMS HACK:
 707      expand also with src->link and dst->link */
 708 #ifdef HAVE_TRACING
 709   if (TRACE_is_enabled()) {
 710     action->src_name = xbt_strdup(src_name);
 711     action->dst_name = xbt_strdup(dst_name);
 712   } else {
 713     action->src_name = action->dst_name = NULL;
 714   }
 715 #endif
 716
 717   xbt_dynar_free(&route);
 718   XBT_OUT();
 719
 720   return (surf_action_t) action;
 721 }
 722
 723 static xbt_dynar_t net_get_route(const char *src, const char *dst)
 724 {
 725   return routing_get_route(src, dst);
 726 }
 727
 728 static double net_get_link_bandwidth(const void *link)
 729 {
 730   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 731   return lmm->power.peak * lmm->power.scale;
 732 }
 733
 734 static double net_get_link_latency(const void *link)
 735 {
 736   return ((link_CM02_t) link)->lat_current;
 737 }
 738
 739 static int net_link_shared(const void *link)
 740 {
 741   return
 742       lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 743 }
 744
 745 static void net_action_suspend(surf_action_t action)
 746 {
 747   ((surf_action_network_CM02_t) action)->suspended = 1;
 748   lmm_update_variable_weight(network_maxmin_system,
 749                              ((surf_action_network_CM02_t)
 750                               action)->variable, 0.0);
 751 }
 752
 753 static void net_action_resume(surf_action_t action)
 754 {
 755   if (((surf_action_network_CM02_t) action)->suspended) {
 756     lmm_update_variable_weight(network_maxmin_system,
 757                                ((surf_action_network_CM02_t)
 758                                 action)->variable,
 759                                ((surf_action_network_CM02_t)
 760                                 action)->weight);
 761     ((surf_action_network_CM02_t) action)->suspended = 0;
 762   }
 763 }
 764
 765 static int net_action_is_suspended(surf_action_t action)
 766 {
 767   return ((surf_action_network_CM02_t) action)->suspended;
 768 }
 769
 770 void net_action_set_max_duration(surf_action_t action, double duration)
 771 {
 772   action->max_duration = duration;
 773 }
 774
 775 #ifdef HAVE_TRACING
 776 static void net_action_set_category(surf_action_t action, const char *category)
 777 {
 778   action->category = xbt_strdup (category);
 779 }
 780 #endif
 781
 782 static void net_finalize(void)
 783 {
 784   surf_model_exit(surf_network_model);
 785   surf_network_model = NULL;
 786
 787   lmm_system_free(network_maxmin_system);
 788   network_maxmin_system = NULL;
 789 }
 790
 791 static void surf_network_model_init_internal(void)
 792 {
 793   surf_network_model = surf_model_init();
 794
 795   surf_network_model->name = "network";
 796   surf_network_model->action_unref = net_action_unref;
 797   surf_network_model->action_cancel = net_action_cancel;
 798   surf_network_model->action_recycle = net_action_recycle;
 799   surf_network_model->get_remains = net_action_get_remains;
 800 #ifdef HAVE_LATENCY_BOUND_TRACKING
 801   surf_network_model->get_latency_limited = net_get_link_latency_limited;
 802 #endif
 803
 804   surf_network_model->model_private->resource_used = net_resource_used;
 805   surf_network_model->model_private->share_resources = net_share_resources;
 806   surf_network_model->model_private->update_actions_state =
 807       net_update_actions_state;
 808   surf_network_model->model_private->update_resource_state =
 809       net_update_resource_state;
 810   surf_network_model->model_private->finalize = net_finalize;
 811
 812   surf_network_model->suspend = net_action_suspend;
 813   surf_network_model->resume = net_action_resume;
 814   surf_network_model->is_suspended = net_action_is_suspended;
 815   surf_network_model->set_max_duration = net_action_set_max_duration;
 816 #ifdef HAVE_TRACING
 817   surf_network_model->set_category = net_action_set_category;
 818 #endif
 819
 820   surf_network_model->extension.network.communicate = net_communicate;
 821   surf_network_model->extension.network.get_route = net_get_route;
 822   surf_network_model->extension.network.get_link_bandwidth =
 823       net_get_link_bandwidth;
 824   surf_network_model->extension.network.get_link_latency =
 825       net_get_link_latency;
 826   surf_network_model->extension.network.link_shared = net_link_shared;
 827   surf_network_model->extension.network.add_traces = net_add_traces;
 828   surf_network_model->extension.network.create_resource =
 829       net_create_resource;
 830
 831   if (!network_maxmin_system)
 832     network_maxmin_system = lmm_system_new();
 833
 834   routing_model_create(sizeof(link_CM02_t),
 835                        net_create_resource("__loopback__",
 836                                            498000000, NULL,
 837                                            0.000015, NULL,
 838                                            SURF_RESOURCE_ON, NULL,
 839                                            SURF_LINK_FATPIPE, NULL));
 840 }
 841
 842
 843
 844 /************************************************************************/
 845 /* New model based on LV08 and experimental results of MPI ping-pongs   */
 846 /************************************************************************/
 847 void surf_network_model_init_SMPI(void)
 848 {
 849
 850   if (surf_network_model)
 851     return;
 852   surf_network_model_init_internal();
 853   latency_factor_callback = &smpi_latency_factor;
 854   bandwidth_factor_callback = &smpi_bandwidth_factor;
 855   bandwidth_constraint_callback = &smpi_bandwidth_constraint;
 856   net_define_callbacks();
 857   xbt_dynar_push(model_list, &surf_network_model);
 858   network_solve = lmm_solve;
 859
 860   xbt_cfg_setdefault_double(_surf_cfg_set, "network/sender_gap", 10e-6);
 861   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 862
 863 }
 864
 865 /************************************************************************/
 866 /* New model based on optimizations discussed during this thesis        */
 867 /************************************************************************/
 868 void surf_network_model_init_LegrandVelho(void)
 869 {
 870
 871   if (surf_network_model)
 872     return;
 873   surf_network_model_init_internal();
 874   net_define_callbacks();
 875   xbt_dynar_push(model_list, &surf_network_model);
 876   network_solve = lmm_solve;
 877
 878   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 879   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 880                             0.92);
 881   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 882
 883 }
 884
 885 /***************************************************************************/
 886 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 887 /***************************************************************************/
 888 /* @TechReport{      rr-lip2002-40, */
 889 /*   author        = {Henri Casanova and Loris Marchal}, */
 890 /*   institution   = {LIP}, */
 891 /*   title         = {A Network Model for Simulation of Grid Application}, */
 892 /*   number        = {2002-40}, */
 893 /*   month         = {oct}, */
 894 /*   year          = {2002} */
 895 /* } */
 896 void surf_network_model_init_CM02(void)
 897 {
 898
 899   if (surf_network_model)
 900     return;
 901   surf_network_model_init_internal();
 902   net_define_callbacks();
 903   xbt_dynar_push(model_list, &surf_network_model);
 904   network_solve = lmm_solve;
 905 }
 906
 907 void surf_network_model_init_Reno(void)
 908 {
 909   if (surf_network_model)
 910     return;
 911   surf_network_model_init_internal();
 912   net_define_callbacks();
 913
 914   xbt_dynar_push(model_list, &surf_network_model);
 915   lmm_set_default_protocol_function(func_reno_f, func_reno_fp,
 916                                     func_reno_fpi);
 917   network_solve = lagrange_solve;
 918
 919   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 920   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 921                             0.92);
 922   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 923 }
 924
 925
 926 void surf_network_model_init_Reno2(void)
 927 {
 928   if (surf_network_model)
 929     return;
 930   surf_network_model_init_internal();
 931   net_define_callbacks();
 932
 933   xbt_dynar_push(model_list, &surf_network_model);
 934   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 935                                     func_reno2_fpi);
 936   network_solve = lagrange_solve;
 937
 938   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 939   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 940                             0.92);
 941   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S_parameter",
 942                             8775);
 943 }
 944
 945 void surf_network_model_init_Vegas(void)
 946 {
 947   if (surf_network_model)
 948     return;
 949   surf_network_model_init_internal();
 950   net_define_callbacks();
 951
 952   xbt_dynar_push(model_list, &surf_network_model);
 953   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 954                                     func_vegas_fpi);
 955   network_solve = lagrange_solve;
 956
 957   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 958   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 959                             0.92);
 960   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 961 }