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_size(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     net_create_resource(bprintf("%s_UP", link->id),
 204                         link->bandwidth,
 205                         link->bandwidth_trace,
 206                         link->latency,
 207                         link->latency_trace,
 208                         link->state,
 209                         link->state_trace,
 210                         link->policy,
 211                         link->properties);
 212     net_create_resource(bprintf("%s_DOWN", link->id),
 213                         link->bandwidth,
 214                         link->bandwidth_trace,
 215                         link->latency,
 216                         link->latency_trace,
 217                         link->state,
 218                         link->state_trace,
 219                         link->policy,
 220                         NULL); /* FIXME: We need to deep copy the properties or
 221                                 * we won't be able to free it */
 222   } else {
 223     net_create_resource(xbt_strdup(link->id),
 224                         link->bandwidth,
 225                         link->bandwidth_trace,
 226                         link->latency,
 227                         link->latency_trace,
 228                         link->state,
 229                         link->state_trace,
 230                         link->policy,
 231                         link->properties);
 232   }
 233 }
 234
 235 static void net_add_traces(void)
 236 {
 237   xbt_dict_cursor_t cursor = NULL;
 238   char *trace_name, *elm;
 239
 240   static int called = 0;
 241   if (called)
 242     return;
 243   called = 1;
 244
 245   /* connect all traces relative to network */
 246   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 247     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 248     link_CM02_t link =
 249         xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 250
 251     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 252                 trace_name, elm);
 253     xbt_assert(trace,
 254                 "Cannot connect trace %s to link %s: trace undefined",
 255                 trace_name, elm);
 256
 257     link->lmm_resource.state_event =
 258         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 259   }
 260
 261   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 262     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 263     link_CM02_t link =
 264                 xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 265
 266     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 267                 trace_name, elm);
 268     xbt_assert(trace,
 269                 "Cannot connect trace %s to link %s: trace undefined",
 270                 trace_name, elm);
 271
 272     link->lmm_resource.power.event =
 273         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 274   }
 275
 276   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 277     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 278     link_CM02_t link =
 279                 xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 280
 281     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 282                 trace_name, elm);
 283     xbt_assert(trace,
 284                 "Cannot connect trace %s to link %s: trace undefined",
 285                 trace_name, elm);
 286
 287     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 288   }
 289 }
 290
 291 static void net_define_callbacks(void)
 292 {
 293   /* Figuring out the network links */
 294   sg_platf_link_add_cb(net_parse_link_init);
 295   sg_platf_postparse_add_cb(net_add_traces);
 296 }
 297
 298 static int net_resource_used(void *resource_id)
 299 {
 300   return lmm_constraint_used(network_maxmin_system,
 301                              ((surf_resource_lmm_t)
 302                               resource_id)->constraint);
 303 }
 304
 305 static int net_action_unref(surf_action_t action)
 306 {
 307   action->refcount--;
 308   if (!action->refcount) {
 309     xbt_swag_remove(action, action->state_set);
 310     if (((surf_action_network_CM02_t) action)->variable)
 311       lmm_variable_free(network_maxmin_system,
 312                         ((surf_action_network_CM02_t) action)->variable);
 313 #ifdef HAVE_TRACING
 314     xbt_free(((surf_action_network_CM02_t) action)->src_name);
 315     xbt_free(((surf_action_network_CM02_t) action)->dst_name);
 316     if (action->category)
 317       xbt_free(action->category);
 318 #endif
 319     surf_action_free(&action);
 320     return 1;
 321   }
 322   return 0;
 323 }
 324
 325 static void net_action_cancel(surf_action_t action)
 326 {
 327   surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 328 }
 329
 330 void net_action_recycle(surf_action_t action)
 331 {
 332   return;
 333 }
 334
 335 #ifdef HAVE_LATENCY_BOUND_TRACKING
 336 int net_get_link_latency_limited(surf_action_t action)
 337 {
 338   return action->latency_limited;
 339 }
 340 #endif
 341
 342 double net_action_get_remains(surf_action_t action)
 343 {
 344   return action->remains;
 345 }
 346
 347 static double net_share_resources(double now)
 348 {
 349   s_surf_action_network_CM02_t s_action;
 350   surf_action_network_CM02_t action = NULL;
 351   xbt_swag_t running_actions =
 352       surf_network_model->states.running_action_set;
 353   double min;
 354
 355   min = generic_maxmin_share_resources(running_actions,
 356                                        xbt_swag_offset(s_action,
 357                                                        variable),
 358                                        network_maxmin_system,
 359                                        network_solve);
 360
 361 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 362
 363   xbt_swag_foreach(action, running_actions) {
 364 #ifdef HAVE_LATENCY_BOUND_TRACKING
 365     if (lmm_is_variable_limited_by_latency(action->variable)) {
 366       (action->generic_action).latency_limited = 1;
 367     } else {
 368       (action->generic_action).latency_limited = 0;
 369     }
 370 #endif
 371     if (action->latency > 0) {
 372       if (min < 0)
 373         min = action->latency;
 374       else if (action->latency < min)
 375         min = action->latency;
 376     }
 377   }
 378
 379   XBT_DEBUG("Min of share resources %f", min);
 380
 381   return min;
 382 }
 383
 384 static void net_update_actions_state(double now, double delta)
 385 {
 386   double deltap = 0.0;
 387   surf_action_network_CM02_t action = NULL;
 388   surf_action_network_CM02_t next_action = NULL;
 389   xbt_swag_t running_actions =
 390       surf_network_model->states.running_action_set;
 391   /*
 392      xbt_swag_t failed_actions =
 393      surf_network_model->states.failed_action_set;
 394    */
 395
 396   xbt_swag_foreach_safe(action, next_action, running_actions) {
 397     deltap = delta;
 398     if (action->latency > 0) {
 399       if (action->latency > deltap) {
 400         double_update(&(action->latency), deltap);
 401         deltap = 0.0;
 402       } else {
 403         double_update(&(deltap), action->latency);
 404         action->latency = 0.0;
 405       }
 406       if ((action->latency == 0.0) && !(action->suspended))
 407         lmm_update_variable_weight(network_maxmin_system, action->variable,
 408                                    action->weight);
 409     }
 410 #ifdef HAVE_TRACING
 411     if (TRACE_is_enabled()) {
 412       xbt_dynar_t route = global_routing->get_route(action->src_name,
 413                                                     action->dst_name);
 414       link_CM02_t link;
 415       unsigned int i;
 416       xbt_dynar_foreach(route, i, link) {
 417         TRACE_surf_link_set_utilization(link->lmm_resource.generic_resource.name,
 418                                         action->generic_action.data,
 419                                         (surf_action_t) action,
 420                                         lmm_variable_getvalue
 421                                         (action->variable), now - delta,
 422                                         delta);
 423       }
 424     }
 425 #endif
 426     if(!lmm_get_number_of_cnst_from_var(network_maxmin_system, action->variable)) {
 427                                 /* There is actually no link used, hence an infinite bandwidth.
 428                                  * This happens often when using models like vivaldi.
 429                                  * In such case, just make sure that the action completes immediately.
 430                                  */
 431         double_update(&(action->generic_action.remains),
 432                         action->generic_action.remains);
 433     }
 434     double_update(&(action->generic_action.remains),
 435                   lmm_variable_getvalue(action->variable) * deltap);
 436     if (action->generic_action.max_duration != NO_MAX_DURATION)
 437       double_update(&(action->generic_action.max_duration), delta);
 438
 439     if ((action->generic_action.remains <= 0) &&
 440         (lmm_get_variable_weight(action->variable) > 0)) {
 441       action->generic_action.finish = surf_get_clock();
 442       surf_network_model->action_state_set((surf_action_t) action,
 443                                            SURF_ACTION_DONE);
 444       gap_remove(action);
 445     } else if ((action->generic_action.max_duration != NO_MAX_DURATION)
 446                && (action->generic_action.max_duration <= 0)) {
 447       action->generic_action.finish = surf_get_clock();
 448       surf_network_model->action_state_set((surf_action_t) action,
 449                                            SURF_ACTION_DONE);
 450       gap_remove(action);
 451     }
 452   }
 453
 454   return;
 455 }
 456
 457 static void net_update_resource_state(void *id,
 458                                       tmgr_trace_event_t event_type,
 459                                       double value, double date)
 460 {
 461   link_CM02_t nw_link = id;
 462   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 463   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 464   /*     value, event_type); */
 465
 466   if (event_type == nw_link->lmm_resource.power.event) {
 467     double delta =
 468         sg_weight_S_parameter / value - sg_weight_S_parameter /
 469         (nw_link->lmm_resource.power.peak *
 470          nw_link->lmm_resource.power.scale);
 471     lmm_variable_t var = NULL;
 472     lmm_element_t elem = NULL;
 473     surf_action_network_CM02_t action = NULL;
 474
 475     nw_link->lmm_resource.power.peak = value;
 476     lmm_update_constraint_bound(network_maxmin_system,
 477                                 nw_link->lmm_resource.constraint,
 478                                 sg_bandwidth_factor *
 479                                 (nw_link->lmm_resource.power.peak *
 480                                  nw_link->lmm_resource.power.scale));
 481 #ifdef HAVE_TRACING
 482     TRACE_surf_link_set_bandwidth(date, nw_link->lmm_resource.generic_resource.name,
 483                                   sg_bandwidth_factor *
 484                                   (nw_link->lmm_resource.power.peak *
 485                                    nw_link->lmm_resource.power.scale));
 486 #endif
 487     if (sg_weight_S_parameter > 0) {
 488       while ((var = lmm_get_var_from_cnst
 489               (network_maxmin_system, nw_link->lmm_resource.constraint,
 490                &elem))) {
 491         action = lmm_variable_id(var);
 492         action->weight += delta;
 493         if (!(action->suspended))
 494           lmm_update_variable_weight(network_maxmin_system,
 495                                      action->variable, action->weight);
 496       }
 497     }
 498     if (tmgr_trace_event_free(event_type))
 499       nw_link->lmm_resource.power.event = NULL;
 500   } else if (event_type == nw_link->lat_event) {
 501     double delta = value - nw_link->lat_current;
 502     lmm_variable_t var = NULL;
 503     lmm_element_t elem = NULL;
 504     surf_action_network_CM02_t action = NULL;
 505
 506     nw_link->lat_current = value;
 507     while ((var = lmm_get_var_from_cnst
 508             (network_maxmin_system, nw_link->lmm_resource.constraint,
 509              &elem))) {
 510       action = lmm_variable_id(var);
 511       action->lat_current += delta;
 512       action->weight += delta;
 513       if (action->rate < 0)
 514         lmm_update_variable_bound(network_maxmin_system, action->variable,
 515                                   sg_tcp_gamma / (2.0 *
 516                                                   action->lat_current));
 517       else {
 518         lmm_update_variable_bound(network_maxmin_system, action->variable,
 519                                   min(action->rate,
 520                                       sg_tcp_gamma / (2.0 *
 521                                                       action->lat_current)));
 522
 523         if (action->rate < sg_tcp_gamma / (2.0 * action->lat_current)) {
 524           XBT_INFO("Flow is limited BYBANDWIDTH");
 525         } else {
 526           XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 527                 action->lat_current);
 528         }
 529       }
 530       if (!(action->suspended))
 531         lmm_update_variable_weight(network_maxmin_system, action->variable,
 532                                    action->weight);
 533
 534     }
 535     if (tmgr_trace_event_free(event_type))
 536       nw_link->lat_event = NULL;
 537   } else if (event_type == nw_link->lmm_resource.state_event) {
 538     if (value > 0)
 539       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 540     else {
 541       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 542       lmm_variable_t var = NULL;
 543       lmm_element_t elem = NULL;
 544
 545       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 546       while ((var = lmm_get_var_from_cnst
 547               (network_maxmin_system, cnst, &elem))) {
 548         surf_action_t action = lmm_variable_id(var);
 549
 550         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 551             surf_action_state_get(action) == SURF_ACTION_READY) {
 552           action->finish = date;
 553           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 554         }
 555       }
 556     }
 557     if (tmgr_trace_event_free(event_type))
 558       nw_link->lmm_resource.state_event = NULL;
 559   } else {
 560     XBT_CRITICAL("Unknown event ! \n");
 561     xbt_abort();
 562   }
 563
 564   return;
 565 }
 566
 567
 568 static surf_action_t net_communicate(const char *src_name,
 569                                      const char *dst_name, double size,
 570                                      double rate)
 571 {
 572   unsigned int i;
 573   link_CM02_t link;
 574   int failed = 0;
 575   surf_action_network_CM02_t action = NULL;
 576   double bandwidth_bound;
 577   double latency=0.0;
 578   /* LARGE PLATFORMS HACK:
 579      Add a link_CM02_t *link and a int link_nb to network_card_CM02_t. It will represent local links for this node
 580      Use the cluster_id for ->id */
 581
 582   xbt_dynar_t back_route = NULL;
 583   int constraints_per_variable = 0;
 584   xbt_dynar_t route;
 585   // I will need this route for some time so require for no cleanup
 586   global_routing->get_route_latency(src_name, dst_name, &route, &latency, 0);
 587
 588   if (sg_network_fullduplex == 1) {
 589     back_route = global_routing->get_route(dst_name, src_name);
 590   }
 591
 592   /* LARGE PLATFORMS HACK:
 593      total_route_size = route_size + src->link_nb + dst->nb */
 594
 595   XBT_IN("(%s,%s,%g,%g)", src_name, dst_name, size, rate);
 596   /* LARGE PLATFORMS HACK:
 597      assert on total_route_size */
 598   xbt_assert(xbt_dynar_length(route) || latency,
 599               "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 600               src_name, dst_name);
 601
 602   xbt_dynar_foreach(route, i, link) {
 603     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 604       failed = 1;
 605       break;
 606     }
 607   }
 608   action =
 609       surf_action_new(sizeof(s_surf_action_network_CM02_t), size,
 610                       surf_network_model, failed);
 611 #ifdef HAVE_LATENCY_BOUND_TRACKING
 612   (action->generic_action).latency_limited = 0;
 613 #endif
 614   action->weight = action->latency = latency;
 615
 616   xbt_swag_insert(action, action->generic_action.state_set);
 617   action->rate = rate;
 618
 619   bandwidth_bound = -1.0;
 620
 621   xbt_dynar_foreach(route, i, link) {
 622     action->weight +=
 623         sg_weight_S_parameter /
 624         (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 625     if (bandwidth_bound < 0.0)
 626       bandwidth_bound =
 627           (*bandwidth_factor_callback) (size) *
 628           (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 629     else
 630       bandwidth_bound =
 631           min(bandwidth_bound,
 632               (*bandwidth_factor_callback) (size) *
 633               (link->lmm_resource.power.peak *
 634                link->lmm_resource.power.scale));
 635   }
 636   /* LARGE PLATFORMS HACK:
 637      Add src->link and dst->link latencies */
 638   action->lat_current = action->latency;
 639   action->latency *= (*latency_factor_callback) (size);
 640   action->rate =
 641       (*bandwidth_constraint_callback) (action->rate, bandwidth_bound,
 642                                         size);
 643
 644   if(xbt_dynar_length(route) > 0) {
 645     link = *(link_CM02_t*)xbt_dynar_get_ptr(route, 0);
 646     gap_append(size, link, action);
 647     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 648            action, src_name, dst_name, action->sender.gap, action->latency);
 649   } else {
 650     gap_unknown(action);
 651   }
 652
 653
 654   /* LARGE PLATFORMS HACK:
 655      lmm_variable_new(..., total_route_size) */
 656   if (back_route != NULL) {
 657     constraints_per_variable =
 658         xbt_dynar_length(route) + xbt_dynar_length(back_route);
 659   } else {
 660     constraints_per_variable = xbt_dynar_length(route);
 661   }
 662
 663   if (action->latency > 0)
 664     action->variable =
 665         lmm_variable_new(network_maxmin_system, action, 0.0, -1.0,
 666                          constraints_per_variable);
 667   else
 668     action->variable =
 669         lmm_variable_new(network_maxmin_system, action, 1.0, -1.0,
 670                          constraints_per_variable);
 671
 672   if (action->rate < 0) {
 673     if (action->lat_current > 0)
 674       lmm_update_variable_bound(network_maxmin_system, action->variable,
 675                                 sg_tcp_gamma / (2.0 *
 676                                                 action->lat_current));
 677     else
 678       lmm_update_variable_bound(network_maxmin_system, action->variable,
 679                                 -1.0);
 680   } else {
 681     if (action->lat_current > 0)
 682       lmm_update_variable_bound(network_maxmin_system, action->variable,
 683                                 min(action->rate,
 684                                     sg_tcp_gamma / (2.0 *
 685                                                     action->lat_current)));
 686     else
 687       lmm_update_variable_bound(network_maxmin_system, action->variable,
 688                                 action->rate);
 689   }
 690
 691   xbt_dynar_foreach(route, i, link) {
 692     lmm_expand(network_maxmin_system, link->lmm_resource.constraint,
 693                action->variable, 1.0);
 694   }
 695
 696   if (sg_network_fullduplex == 1) {
 697     XBT_DEBUG("Fullduplex active adding backward flow using 5%c", '%');
 698     xbt_dynar_foreach(back_route, i, link) {
 699       lmm_expand(network_maxmin_system, link->lmm_resource.constraint,
 700                  action->variable, .05);
 701     }
 702   }
 703   /* LARGE PLATFORMS HACK:
 704      expand also with src->link and dst->link */
 705 #ifdef HAVE_TRACING
 706   if (TRACE_is_enabled()) {
 707     action->src_name = xbt_strdup(src_name);
 708     action->dst_name = xbt_strdup(dst_name);
 709   } else {
 710     action->src_name = action->dst_name = NULL;
 711   }
 712 #endif
 713
 714   xbt_dynar_free(&route);
 715   XBT_OUT();
 716
 717   return (surf_action_t) action;
 718 }
 719
 720 static xbt_dynar_t net_get_route(const char *src, const char *dst)
 721 {
 722   return global_routing->get_route(src, dst);
 723 }
 724
 725 static double net_get_link_bandwidth(const void *link)
 726 {
 727   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 728   return lmm->power.peak * lmm->power.scale;
 729 }
 730
 731 static double net_get_link_latency(const void *link)
 732 {
 733   return ((link_CM02_t) link)->lat_current;
 734 }
 735
 736 static int net_link_shared(const void *link)
 737 {
 738   return
 739       lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 740 }
 741
 742 static void net_action_suspend(surf_action_t action)
 743 {
 744   ((surf_action_network_CM02_t) action)->suspended = 1;
 745   lmm_update_variable_weight(network_maxmin_system,
 746                              ((surf_action_network_CM02_t)
 747                               action)->variable, 0.0);
 748 }
 749
 750 static void net_action_resume(surf_action_t action)
 751 {
 752   if (((surf_action_network_CM02_t) action)->suspended) {
 753     lmm_update_variable_weight(network_maxmin_system,
 754                                ((surf_action_network_CM02_t)
 755                                 action)->variable,
 756                                ((surf_action_network_CM02_t)
 757                                 action)->weight);
 758     ((surf_action_network_CM02_t) action)->suspended = 0;
 759   }
 760 }
 761
 762 static int net_action_is_suspended(surf_action_t action)
 763 {
 764   return ((surf_action_network_CM02_t) action)->suspended;
 765 }
 766
 767 void net_action_set_max_duration(surf_action_t action, double duration)
 768 {
 769   action->max_duration = duration;
 770 }
 771
 772 #ifdef HAVE_TRACING
 773 static void net_action_set_category(surf_action_t action, const char *category)
 774 {
 775   action->category = xbt_strdup (category);
 776 }
 777 #endif
 778
 779 static void net_finalize(void)
 780 {
 781   surf_model_exit(surf_network_model);
 782   surf_network_model = NULL;
 783
 784   global_routing->finalize();
 785
 786   lmm_system_free(network_maxmin_system);
 787   network_maxmin_system = NULL;
 788 }
 789
 790 static void surf_network_model_init_internal(void)
 791 {
 792   surf_network_model = surf_model_init();
 793
 794   surf_network_model->name = "network";
 795   surf_network_model->action_unref = net_action_unref;
 796   surf_network_model->action_cancel = net_action_cancel;
 797   surf_network_model->action_recycle = net_action_recycle;
 798   surf_network_model->get_remains = net_action_get_remains;
 799 #ifdef HAVE_LATENCY_BOUND_TRACKING
 800   surf_network_model->get_latency_limited = net_get_link_latency_limited;
 801 #endif
 802
 803   surf_network_model->model_private->resource_used = net_resource_used;
 804   surf_network_model->model_private->share_resources = net_share_resources;
 805   surf_network_model->model_private->update_actions_state =
 806       net_update_actions_state;
 807   surf_network_model->model_private->update_resource_state =
 808       net_update_resource_state;
 809   surf_network_model->model_private->finalize = net_finalize;
 810
 811   surf_network_model->suspend = net_action_suspend;
 812   surf_network_model->resume = net_action_resume;
 813   surf_network_model->is_suspended = net_action_is_suspended;
 814   surf_network_model->set_max_duration = net_action_set_max_duration;
 815 #ifdef HAVE_TRACING
 816   surf_network_model->set_category = net_action_set_category;
 817 #endif
 818
 819   surf_network_model->extension.network.communicate = net_communicate;
 820   surf_network_model->extension.network.get_route = net_get_route;
 821   surf_network_model->extension.network.get_link_bandwidth =
 822       net_get_link_bandwidth;
 823   surf_network_model->extension.network.get_link_latency =
 824       net_get_link_latency;
 825   surf_network_model->extension.network.link_shared = net_link_shared;
 826   surf_network_model->extension.network.add_traces = net_add_traces;
 827   surf_network_model->extension.network.create_resource =
 828       net_create_resource;
 829
 830   if (!network_maxmin_system)
 831     network_maxmin_system = lmm_system_new();
 832
 833   routing_model_create(sizeof(link_CM02_t),
 834                        net_create_resource(xbt_strdup("__loopback__"),
 835                                            498000000, NULL,
 836                                            0.000015, NULL,
 837                                            SURF_RESOURCE_ON, NULL,
 838                                            SURF_LINK_FATPIPE, NULL),
 839                        net_get_link_latency);
 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   update_model_description(surf_network_model_description,
 864                            "SMPI", surf_network_model);
 865 }
 866
 867 /************************************************************************/
 868 /* New model based on optimizations discussed during this thesis        */
 869 /************************************************************************/
 870 void surf_network_model_init_LegrandVelho(void)
 871 {
 872
 873   if (surf_network_model)
 874     return;
 875   surf_network_model_init_internal();
 876   net_define_callbacks();
 877   xbt_dynar_push(model_list, &surf_network_model);
 878   network_solve = lmm_solve;
 879
 880   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 881   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 882                             0.92);
 883   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 884
 885   update_model_description(surf_network_model_description,
 886                            "LV08_fullupdate", surf_network_model);
 887 }
 888
 889 /***************************************************************************/
 890 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 891 /***************************************************************************/
 892 /* @TechReport{      rr-lip2002-40, */
 893 /*   author        = {Henri Casanova and Loris Marchal}, */
 894 /*   institution   = {LIP}, */
 895 /*   title         = {A Network Model for Simulation of Grid Application}, */
 896 /*   number        = {2002-40}, */
 897 /*   month         = {oct}, */
 898 /*   year          = {2002} */
 899 /* } */
 900 void surf_network_model_init_CM02(void)
 901 {
 902
 903   if (surf_network_model)
 904     return;
 905   surf_network_model_init_internal();
 906   net_define_callbacks();
 907   xbt_dynar_push(model_list, &surf_network_model);
 908   network_solve = lmm_solve;
 909
 910   update_model_description(surf_network_model_description,
 911                            "CM02", surf_network_model);
 912 }
 913
 914 void surf_network_model_init_Reno(void)
 915 {
 916   if (surf_network_model)
 917     return;
 918   surf_network_model_init_internal();
 919   net_define_callbacks();
 920
 921   xbt_dynar_push(model_list, &surf_network_model);
 922   lmm_set_default_protocol_function(func_reno_f, func_reno_fp,
 923                                     func_reno_fpi);
 924   network_solve = lagrange_solve;
 925
 926   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 927   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 928                             0.92);
 929   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 930
 931   update_model_description(surf_network_model_description,
 932                            "Reno", surf_network_model);
 933 }
 934
 935
 936 void surf_network_model_init_Reno2(void)
 937 {
 938   if (surf_network_model)
 939     return;
 940   surf_network_model_init_internal();
 941   net_define_callbacks();
 942
 943   xbt_dynar_push(model_list, &surf_network_model);
 944   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 945                                     func_reno2_fpi);
 946   network_solve = lagrange_solve;
 947
 948   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 949   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 950                             0.92);
 951   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S_parameter",
 952                             8775);
 953
 954   update_model_description(surf_network_model_description,
 955                            "Reno2", surf_network_model);
 956 }
 957
 958 void surf_network_model_init_Vegas(void)
 959 {
 960   if (surf_network_model)
 961     return;
 962   surf_network_model_init_internal();
 963   net_define_callbacks();
 964
 965   xbt_dynar_push(model_list, &surf_network_model);
 966   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 967                                     func_vegas_fpi);
 968   network_solve = lagrange_solve;
 969
 970   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 971   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 972                             0.92);
 973   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 974
 975   update_model_description(surf_network_model_description,
 976                            "Vegas", surf_network_model);
 977 }