src/surf/network.c

   1
   2 /*
   3  * Network with improved management of tasks, IM (Improved Management).
   4  * Uses a heap to store actions so that the share_resources is faster.
   5  * This model automatically sets the selective update flag to 1 and is
   6  * highly dependent on the maxmin lmm module.
   7  */
   8
   9 /* Copyright (c) 2009, 2010, 2011. The SimGrid Team.
  10  * All rights reserved.                                                     */
  11
  12 /* This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the license (GNU LGPL) which comes with this package. */
  14
  15 #include "network_private.h"
  16 #include "xbt/log.h"
  17 #include "xbt/str.h"
  18
  19 #include "surf_private.h"
  20 #include "xbt/dict.h"
  21 #include "maxmin_private.h"
  22 #include "surf/surfxml_parse_values.h"
  23 #include "surf/surf_resource.h"
  24 #include "surf/surf_resource_lmm.h"
  25
  26 #undef GENERIC_LMM_ACTION
  27 #undef GENERIC_ACTION
  28 #define GENERIC_LMM_ACTION(action) (action)->generic_lmm_action
  29 #define GENERIC_ACTION(action) GENERIC_LMM_ACTION(action).generic_action
  30
  31
  32 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_network, surf,
  33                                 "Logging specific to the SURF network module");
  34
  35 surf_model_t surf_network_model = NULL;
  36 static void (*network_solve) (lmm_system_t) = NULL;
  37
  38 xbt_dynar_t smpi_bw_factor = NULL;
  39 xbt_dynar_t smpi_lat_factor = NULL;
  40
  41 typedef struct s_smpi_factor *smpi_factor_t;
  42 typedef struct s_smpi_factor {
  43   long factor;
  44   double value;
  45 } s_smpi_factor_t;
  46
  47
  48 double sg_sender_gap = 0.0;
  49 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
  50 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
  51 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
  52
  53 double sg_tcp_gamma = 0.0;
  54 int sg_network_crosstraffic = 0;
  55
  56 xbt_dict_t gap_lookup = NULL;
  57
  58 /******************************************************************************/
  59 /*                           Factors callbacks                                */
  60 /******************************************************************************/
  61 static double constant_latency_factor(double size)
  62 {
  63   return sg_latency_factor;
  64 }
  65
  66 static double constant_bandwidth_factor(double size)
  67 {
  68   return sg_bandwidth_factor;
  69 }
  70
  71 static double constant_bandwidth_constraint(double rate, double bound,
  72                                             double size)
  73 {
  74   return rate;
  75 }
  76
  77 /**********************/
  78 /*   SMPI callbacks   */
  79 /**********************/
  80 static xbt_dynar_t parse_factor(const char *smpi_coef_string)
  81 {
  82   char *value = NULL;
  83   unsigned int iter = 0;
  84   s_smpi_factor_t fact;
  85   xbt_dynar_t smpi_factor, radical_elements, radical_elements2 = NULL;
  86
  87   smpi_factor = xbt_dynar_new(sizeof(s_smpi_factor_t), NULL);
  88   radical_elements = xbt_str_split(smpi_coef_string, ";");
  89   xbt_dynar_foreach(radical_elements, iter, value) {
  90
  91     radical_elements2 = xbt_str_split(value, ":");
  92     if (xbt_dynar_length(radical_elements2) != 2)
  93       xbt_die("Malformed radical for smpi factor!");
  94     fact.factor = atol(xbt_dynar_get_as(radical_elements2, 0, char *));
  95     fact.value = atof(xbt_dynar_get_as(radical_elements2, 1, char *));
  96     xbt_dynar_push_as(smpi_factor, s_smpi_factor_t, fact);
  97     XBT_DEBUG("smpi_factor:\t%ld : %f", fact.factor, fact.value);
  98     xbt_dynar_free(&radical_elements2);
  99   }
 100   xbt_dynar_free(&radical_elements);
 101   return smpi_factor;
 102 }
 103
 104 static double smpi_bandwidth_factor(double size)
 105 {
 106   if (!smpi_bw_factor)
 107     smpi_bw_factor =
 108         parse_factor(xbt_cfg_get_string(_surf_cfg_set, "smpi/bw_factor"));
 109
 110   unsigned int iter = 0;
 111   s_smpi_factor_t fact;
 112   xbt_dynar_foreach(smpi_bw_factor, iter, fact) {
 113     if (size >= fact.factor) {
 114       XBT_DEBUG("%lf >= %ld return %f", size, fact.factor, fact.value);
 115       return fact.value;
 116     }
 117   }
 118
 119   return 1.0;
 120 }
 121
 122 static double smpi_latency_factor(double size)
 123 {
 124   if (!smpi_lat_factor)
 125     smpi_lat_factor =
 126         parse_factor(xbt_cfg_get_string(_surf_cfg_set, "smpi/lat_factor"));
 127
 128   unsigned int iter = 0;
 129   s_smpi_factor_t fact;
 130   xbt_dynar_foreach(smpi_lat_factor, iter, fact) {
 131     if (size >= fact.factor) {
 132       XBT_DEBUG("%lf >= %ld return %f", size, fact.factor, fact.value);
 133       return fact.value;
 134     }
 135   }
 136
 137   return 1.0;
 138 }
 139
 140 /**--------- <copy/paste C code snippet in surf/network.c> -----------*/
 141
 142 static double smpi_bandwidth_constraint(double rate, double bound,
 143                                         double size)
 144 {
 145   return rate < 0 ? bound : min(bound, rate * smpi_bandwidth_factor(size));
 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 static void (*gap_append) (double, const link_CM02_t,
 156                            surf_action_network_CM02_t) = NULL;
 157
 158 static void *net_create_resource(const char *name,
 159                                  double bw_initial,
 160                                  tmgr_trace_t bw_trace,
 161                                  double lat_initial,
 162                                  tmgr_trace_t lat_trace,
 163                                  e_surf_resource_state_t
 164                                  state_initial,
 165                                  tmgr_trace_t state_trace,
 166                                  e_surf_link_sharing_policy_t
 167                                  policy, xbt_dict_t properties)
 168 {
 169   link_CM02_t nw_link = (link_CM02_t)
 170       surf_resource_lmm_new(sizeof(s_link_CM02_t),
 171                             surf_network_model, name, properties,
 172                             surf_network_model->model_private->maxmin_system,
 173                             sg_bandwidth_factor * bw_initial,
 174                             history,
 175                             state_initial, state_trace,
 176                             bw_initial, bw_trace);
 177
 178   xbt_assert(!xbt_lib_get_or_null(link_lib, name, SURF_LINK_LEVEL),
 179              "Link '%s' declared several times in the platform file.",
 180              name);
 181
 182   nw_link->lat_current = lat_initial;
 183   if (lat_trace)
 184     nw_link->lat_event =
 185         tmgr_history_add_trace(history, lat_trace, 0.0, 0, nw_link);
 186
 187   if (policy == SURF_LINK_FATPIPE)
 188     lmm_constraint_shared(nw_link->lmm_resource.constraint);
 189
 190   xbt_lib_set(link_lib, name, SURF_LINK_LEVEL, nw_link);
 191   XBT_DEBUG("Create link '%s'",name);
 192
 193   return nw_link;
 194 }
 195
 196 static void net_parse_link_init(sg_platf_link_cbarg_t link)
 197 {
 198   if (link->policy == SURF_LINK_FULLDUPLEX) {
 199     char *link_id;
 200     link_id = bprintf("%s_UP", link->id);
 201     net_create_resource(link_id,
 202                         link->bandwidth,
 203                         link->bandwidth_trace,
 204                         link->latency,
 205                         link->latency_trace,
 206                         link->state,
 207                         link->state_trace, link->policy, link->properties);
 208     xbt_free(link_id);
 209     link_id = bprintf("%s_DOWN", link->id);
 210     net_create_resource(link_id,
 211                         link->bandwidth,
 212                         link->bandwidth_trace,
 213                         link->latency,
 214                         link->latency_trace,
 215                         link->state,
 216                         link->state_trace, link->policy, link->properties);
 217     xbt_free(link_id);
 218   } else {
 219     net_create_resource(link->id,
 220                         link->bandwidth,
 221                         link->bandwidth_trace,
 222                         link->latency,
 223                         link->latency_trace,
 224                         link->state,
 225                         link->state_trace, link->policy, link->properties);
 226   }
 227 }
 228
 229 static void net_add_traces(void)
 230 {
 231   xbt_dict_cursor_t cursor = NULL;
 232   char *trace_name, *elm;
 233
 234   static int called = 0;
 235   if (called)
 236     return;
 237   called = 1;
 238
 239   /* connect all traces relative to network */
 240   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 241     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 242     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 243
 244     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 245                trace_name, elm);
 246     xbt_assert(trace,
 247                "Cannot connect trace %s to link %s: trace undefined",
 248                trace_name, elm);
 249
 250     link->lmm_resource.state_event =
 251         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 252   }
 253
 254   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 255     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 256     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 257
 258     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 259                trace_name, elm);
 260     xbt_assert(trace,
 261                "Cannot connect trace %s to link %s: trace undefined",
 262                trace_name, elm);
 263
 264     link->lmm_resource.power.event =
 265         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 266   }
 267
 268   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 269     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 270     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 271
 272     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 273                trace_name, elm);
 274     xbt_assert(trace,
 275                "Cannot connect trace %s to link %s: trace undefined",
 276                trace_name, elm);
 277
 278     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 279   }
 280 }
 281
 282 static void net_define_callbacks(void)
 283 {
 284   /* Figuring out the network links */
 285   sg_platf_link_add_cb(net_parse_link_init);
 286   sg_platf_postparse_add_cb(net_add_traces);
 287 }
 288
 289 static int net_resource_used(void *resource_id)
 290 {
 291   return lmm_constraint_used(surf_network_model->model_private->maxmin_system, ((surf_resource_lmm_t)
 292                                                      resource_id)->
 293                              constraint);
 294 }
 295
 296 void net_action_recycle(surf_action_t action)
 297 {
 298   return;
 299 }
 300
 301 #ifdef HAVE_LATENCY_BOUND_TRACKING
 302 int net_get_link_latency_limited(surf_action_t action)
 303 {
 304   return action->latency_limited;
 305 }
 306 #endif
 307
 308 static double net_share_resources_full(double now)
 309 {
 310   s_surf_action_lmm_t s_action;
 311   surf_action_network_CM02_t action = NULL;
 312   xbt_swag_t running_actions =
 313       surf_network_model->states.running_action_set;
 314   double min;
 315
 316   min = generic_maxmin_share_resources(running_actions,
 317                                        xbt_swag_offset(s_action,
 318                                                        variable),
 319                                                        surf_network_model->model_private->maxmin_system,
 320                                        network_solve);
 321
 322 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 323
 324   xbt_swag_foreach(action, running_actions) {
 325 #ifdef HAVE_LATENCY_BOUND_TRACKING
 326     if (lmm_is_variable_limited_by_latency(GENERIC_LMM_ACTION(action).variable)) {
 327       action->latency_limited = 1;
 328     } else {
 329       action->latency_limited = 0;
 330     }
 331 #endif
 332     if (action->latency > 0) {
 333       min = (min < 0) ? action->latency : min(min, action->latency);
 334     }
 335   }
 336
 337   XBT_DEBUG("Min of share resources %f", min);
 338
 339   return min;
 340 }
 341
 342 static double net_share_resources_lazy(double now)
 343 {
 344   return generic_share_resources_lazy(now, surf_network_model);
 345 }
 346
 347 static void net_update_actions_state_full(double now, double delta)
 348 {
 349   generic_update_actions_state_full(now, delta, surf_network_model);
 350 }
 351
 352 static void net_update_actions_state_lazy(double now, double delta)
 353 {
 354   generic_update_actions_state_lazy(now, delta, surf_network_model);
 355 }
 356
 357 static void net_update_resource_state(void *id,
 358                                       tmgr_trace_event_t event_type,
 359                                       double value, double date)
 360 {
 361   link_CM02_t nw_link = id;
 362   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 363   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 364   /*     value, event_type); */
 365
 366   if (event_type == nw_link->lmm_resource.power.event) {
 367     double delta =
 368         sg_weight_S_parameter / value - sg_weight_S_parameter /
 369         (nw_link->lmm_resource.power.peak *
 370          nw_link->lmm_resource.power.scale);
 371     lmm_variable_t var = NULL;
 372     lmm_element_t elem = NULL;
 373     surf_action_network_CM02_t action = NULL;
 374
 375     nw_link->lmm_resource.power.peak = value;
 376     lmm_update_constraint_bound(surf_network_model->model_private->maxmin_system,
 377                                 nw_link->lmm_resource.constraint,
 378                                 sg_bandwidth_factor *
 379                                 (nw_link->lmm_resource.power.peak *
 380                                  nw_link->lmm_resource.power.scale));
 381 #ifdef HAVE_TRACING
 382     TRACE_surf_link_set_bandwidth(date,
 383                                   (char
 384                                    *) (((nw_link->lmm_resource).
 385                                         generic_resource).name),
 386                                   sg_bandwidth_factor *
 387                                   (nw_link->lmm_resource.power.peak *
 388                                    nw_link->lmm_resource.power.scale));
 389 #endif
 390     if (sg_weight_S_parameter > 0) {
 391       while ((var = lmm_get_var_from_cnst
 392               (surf_network_model->model_private->maxmin_system, nw_link->lmm_resource.constraint,
 393                &elem))) {
 394         action = lmm_variable_id(var);
 395         action->weight += delta;
 396         if (!(GENERIC_LMM_ACTION(action).suspended))
 397           lmm_update_variable_weight(surf_network_model->model_private->maxmin_system,
 398                                      GENERIC_LMM_ACTION(action).variable, action->weight);
 399       }
 400     }
 401     if (tmgr_trace_event_free(event_type))
 402       nw_link->lmm_resource.power.event = NULL;
 403   } else if (event_type == nw_link->lat_event) {
 404     double delta = value - nw_link->lat_current;
 405     lmm_variable_t var = NULL;
 406     lmm_element_t elem = NULL;
 407     surf_action_network_CM02_t action = NULL;
 408
 409     nw_link->lat_current = value;
 410     while ((var = lmm_get_var_from_cnst
 411             (surf_network_model->model_private->maxmin_system, nw_link->lmm_resource.constraint,
 412              &elem))) {
 413       action = lmm_variable_id(var);
 414       action->lat_current += delta;
 415       action->weight += delta;
 416       if (action->rate < 0)
 417         lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 418                                   sg_tcp_gamma / (2.0 *
 419                                                   action->lat_current));
 420       else {
 421         lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 422                                   min(action->rate,
 423                                       sg_tcp_gamma / (2.0 *
 424                                                       action->
 425                                                       lat_current)));
 426
 427         if (action->rate < sg_tcp_gamma / (2.0 * action->lat_current)) {
 428           XBT_INFO("Flow is limited BYBANDWIDTH");
 429         } else {
 430           XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 431                    action->lat_current);
 432         }
 433       }
 434       if (!(GENERIC_LMM_ACTION(action).suspended))
 435         lmm_update_variable_weight(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 436                                    action->weight);
 437
 438     }
 439     if (tmgr_trace_event_free(event_type))
 440       nw_link->lat_event = NULL;
 441   } else if (event_type == nw_link->lmm_resource.state_event) {
 442     if (value > 0)
 443       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 444     else {
 445       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 446       lmm_variable_t var = NULL;
 447       lmm_element_t elem = NULL;
 448
 449       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 450       while ((var = lmm_get_var_from_cnst
 451               (surf_network_model->model_private->maxmin_system, cnst, &elem))) {
 452         surf_action_t action = lmm_variable_id(var);
 453
 454         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 455             surf_action_state_get(action) == SURF_ACTION_READY) {
 456           action->finish = date;
 457           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 458         }
 459       }
 460     }
 461     if (tmgr_trace_event_free(event_type))
 462       nw_link->lmm_resource.state_event = NULL;
 463   } else {
 464     XBT_CRITICAL("Unknown event ! \n");
 465     xbt_abort();
 466   }
 467
 468   XBT_DEBUG
 469       ("There were a resource state event, need to update actions related to the constraint (%p)",
 470        nw_link->lmm_resource.constraint);
 471   return;
 472 }
 473
 474
 475 static surf_action_t net_communicate(sg_routing_edge_t src,
 476                                      sg_routing_edge_t dst,
 477                                      double size, double rate)
 478 {
 479   unsigned int i;
 480   link_CM02_t link;
 481   int failed = 0;
 482   surf_action_network_CM02_t action = NULL;
 483   double bandwidth_bound;
 484   double latency = 0.0;
 485   xbt_dynar_t back_route = NULL;
 486   int constraints_per_variable = 0;
 487
 488   xbt_dynar_t route = xbt_dynar_new(sizeof(sg_routing_link_t), NULL);
 489
 490   XBT_IN("(%s,%s,%g,%g)", src->name, dst->name, size, rate);
 491
 492   routing_get_route_and_latency(src, dst, &route, &latency);
 493   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 494              "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 495              src->name, dst->name);
 496
 497   xbt_dynar_foreach(route, i, link) {
 498     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 499       failed = 1;
 500       break;
 501     }
 502   }
 503   if (sg_network_crosstraffic == 1) {
 504     routing_get_route_and_latency(dst, src, &back_route, NULL);
 505     xbt_dynar_foreach(back_route, i, link) {
 506       if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 507         failed = 1;
 508         break;
 509       }
 510     }
 511   }
 512
 513   action =
 514       surf_action_new(sizeof(s_surf_action_network_CM02_t), size,
 515                       surf_network_model, failed);
 516 #ifdef HAVE_LATENCY_BOUND_TRACKING
 517   action->latency_limited = 0;
 518 #endif
 519   action->weight = action->latency = latency;
 520
 521   xbt_swag_insert(action, ((surf_action_t)action)->state_set);
 522   action->rate = rate;
 523   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 524     GENERIC_LMM_ACTION(action).index_heap = -1;
 525     GENERIC_LMM_ACTION(action).last_update = surf_get_clock();
 526   }
 527
 528   bandwidth_bound = -1.0;
 529   if (sg_weight_S_parameter > 0) {
 530     xbt_dynar_foreach(route, i, link) {
 531       action->weight +=
 532           sg_weight_S_parameter /
 533           (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 534     }
 535   }
 536   xbt_dynar_foreach(route, i, link) {
 537     double bb = bandwidth_factor_callback(size) *
 538         (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 539     bandwidth_bound =
 540         (bandwidth_bound < 0.0) ? bb : min(bandwidth_bound, bb);
 541   }
 542
 543   action->lat_current = action->latency;
 544   action->latency *= latency_factor_callback(size);
 545   action->rate =
 546       bandwidth_constraint_callback(action->rate, bandwidth_bound, size);
 547   if (gap_append) {
 548     xbt_assert(!xbt_dynar_is_empty(route),
 549                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 550
 551     link = *(link_CM02_t *) xbt_dynar_get_ptr(route, 0);
 552     gap_append(size, link, action);
 553     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 554               action, src->name, dst->name, action->sender.gap,
 555               action->latency);
 556   }
 557
 558   constraints_per_variable = xbt_dynar_length(route);
 559   if (back_route != NULL)
 560     constraints_per_variable += xbt_dynar_length(back_route);
 561
 562   if (action->latency > 0) {
 563     GENERIC_LMM_ACTION(action).variable =
 564         lmm_variable_new(surf_network_model->model_private->maxmin_system, action, 0.0, -1.0,
 565                          constraints_per_variable);
 566     if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 567       // add to the heap the event when the latency is payed
 568       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 569                 action->latency + GENERIC_LMM_ACTION(action).last_update);
 570       surf_action_lmm_heap_insert(surf_network_model->model_private->action_heap,(surf_action_lmm_t)action, action->latency + GENERIC_LMM_ACTION(action).last_update,
 571                   xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 572     }
 573   } else
 574     GENERIC_LMM_ACTION(action).variable =
 575         lmm_variable_new(surf_network_model->model_private->maxmin_system, action, 1.0, -1.0,
 576                          constraints_per_variable);
 577
 578   if (action->rate < 0) {
 579     lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 580                               (action->lat_current > 0) ?
 581                               sg_tcp_gamma / (2.0 *
 582                                               action->lat_current) : -1.0);
 583   } else {
 584     lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 585                               (action->lat_current > 0) ?
 586                               min(action->rate,
 587                                   sg_tcp_gamma / (2.0 *
 588                                                   action->lat_current))
 589                               : action->rate);
 590   }
 591
 592   xbt_dynar_foreach(route, i, link) {
 593     lmm_expand(surf_network_model->model_private->maxmin_system, link->lmm_resource.constraint,
 594                GENERIC_LMM_ACTION(action).variable, 1.0);
 595   }
 596
 597   if (sg_network_crosstraffic == 1) {
 598     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 599     xbt_dynar_foreach(back_route, i, link) {
 600       lmm_expand(surf_network_model->model_private->maxmin_system, link->lmm_resource.constraint,
 601                  GENERIC_LMM_ACTION(action).variable, .05);
 602     }
 603   }
 604
 605   xbt_dynar_free(&route);
 606   XBT_OUT();
 607
 608   return (surf_action_t) action;
 609 }
 610
 611 static xbt_dynar_t net_get_route(void *src, void *dst)
 612 {
 613   xbt_dynar_t route = NULL;
 614   routing_get_route_and_latency(src, dst, &route, NULL);
 615   return route;
 616 }
 617
 618 static double net_get_link_bandwidth(const void *link)
 619 {
 620   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 621   return lmm->power.peak * lmm->power.scale;
 622 }
 623
 624 static double net_get_link_latency(const void *link)
 625 {
 626   return ((link_CM02_t) link)->lat_current;
 627 }
 628
 629 static int net_link_shared(const void *link)
 630 {
 631   return
 632       lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 633 }
 634
 635 static void net_finalize(void)
 636 {
 637   lmm_system_free(surf_network_model->model_private->maxmin_system);
 638   surf_network_model->model_private->maxmin_system = NULL;
 639
 640   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 641     xbt_heap_free(surf_network_model->model_private->action_heap);
 642     xbt_swag_free(surf_network_model->model_private->modified_set);
 643   }
 644
 645   surf_model_exit(surf_network_model);
 646   surf_network_model = NULL;
 647
 648   if (smpi_bw_factor)
 649     xbt_dynar_free(&smpi_bw_factor);
 650   if (smpi_lat_factor)
 651     xbt_dynar_free(&smpi_lat_factor);
 652 }
 653
 654 static void smpi_gap_append(double size, const link_CM02_t link,
 655                             surf_action_network_CM02_t action)
 656 {
 657   const char *src = link->lmm_resource.generic_resource.name;
 658   xbt_fifo_t fifo;
 659   surf_action_network_CM02_t last_action;
 660   double bw;
 661
 662   if (sg_sender_gap > 0.0) {
 663     if (!gap_lookup) {
 664       gap_lookup = xbt_dict_new();
 665     }
 666     fifo = (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup, src);
 667     action->sender.gap = 0.0;
 668     if (fifo && xbt_fifo_size(fifo) > 0) {
 669       /* Compute gap from last send */
 670       last_action =
 671           (surf_action_network_CM02_t)
 672           xbt_fifo_get_item_content(xbt_fifo_get_last_item(fifo));
 673       bw = net_get_link_bandwidth(link);
 674       action->sender.gap =
 675           last_action->sender.gap + max(sg_sender_gap,
 676                                         last_action->sender.size / bw);
 677       action->latency += action->sender.gap;
 678     }
 679     /* Append action as last send */
 680     action->sender.link_name = link->lmm_resource.generic_resource.name;
 681     fifo =
 682         (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup,
 683                                           action->sender.link_name);
 684     if (!fifo) {
 685       fifo = xbt_fifo_new();
 686       xbt_dict_set(gap_lookup, action->sender.link_name, fifo, NULL);
 687     }
 688     action->sender.fifo_item = xbt_fifo_push(fifo, action);
 689     action->sender.size = size;
 690   }
 691 }
 692
 693 static void smpi_gap_remove(surf_action_lmm_t lmm_action)
 694 {
 695   xbt_fifo_t fifo;
 696   size_t size;
 697   surf_action_network_CM02_t action = (surf_action_network_CM02_t)(lmm_action);
 698
 699   if (sg_sender_gap > 0.0 && action->sender.link_name
 700       && action->sender.fifo_item) {
 701     fifo =
 702         (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup,
 703                                           action->sender.link_name);
 704     xbt_fifo_remove_item(fifo, action->sender.fifo_item);
 705     size = xbt_fifo_size(fifo);
 706     if (size == 0) {
 707       xbt_fifo_free(fifo);
 708       xbt_dict_remove(gap_lookup, action->sender.link_name);
 709       size = xbt_dict_length(gap_lookup);
 710       if (size == 0) {
 711         xbt_dict_free(&gap_lookup);
 712       }
 713     }
 714   }
 715 }
 716
 717 static void set_update_mechanism(void)
 718 {
 719   char *optim = xbt_cfg_get_string(_surf_cfg_set, "network/optim");
 720   int select =
 721       xbt_cfg_get_int(_surf_cfg_set, "network/maxmin_selective_update");
 722
 723   if (!strcmp(optim, "Full")) {
 724     surf_network_model->model_private->update_mechanism = UM_FULL;
 725     surf_network_model->model_private->selective_update = select;
 726   } else if (!strcmp(optim, "Lazy")) {
 727     surf_network_model->model_private->update_mechanism = UM_LAZY;
 728     surf_network_model->model_private->selective_update = 1;
 729     xbt_assert((select == 1)
 730                ||
 731                (xbt_cfg_is_default_value
 732                 (_surf_cfg_set, "network/maxmin_selective_update")),
 733                "Disabling selective update while using the lazy update mechanism is dumb!");
 734   } else {
 735     xbt_die("Unsupported optimization (%s) for this model", optim);
 736   }
 737 }
 738
 739 static void surf_network_model_init_internal(void)
 740 {
 741   s_surf_action_network_CM02_t comm;
 742   surf_network_model = surf_model_init();
 743
 744   set_update_mechanism();
 745
 746   surf_network_model->name = "network";
 747   surf_network_model->action_unref = surf_action_unref;
 748   surf_network_model->action_cancel = surf_action_cancel;
 749   surf_network_model->action_recycle = net_action_recycle;
 750
 751   surf_network_model->get_remains = surf_action_get_remains;
 752
 753 #ifdef HAVE_LATENCY_BOUND_TRACKING
 754   surf_network_model->get_latency_limited = net_get_link_latency_limited;
 755 #endif
 756 #ifdef HAVE_TRACING
 757   surf_network_model->set_category = surf_action_set_category;
 758 #endif
 759
 760   surf_network_model->model_private->resource_used = net_resource_used;
 761   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 762     surf_network_model->model_private->share_resources =
 763         net_share_resources_lazy;
 764     surf_network_model->model_private->update_actions_state =
 765         net_update_actions_state_lazy;
 766   } else if (surf_network_model->model_private->update_mechanism == UM_FULL) {
 767     surf_network_model->model_private->share_resources =
 768         net_share_resources_full;
 769     surf_network_model->model_private->update_actions_state =
 770         net_update_actions_state_full;
 771   }
 772
 773   surf_network_model->model_private->update_resource_state =
 774       net_update_resource_state;
 775   surf_network_model->model_private->finalize = net_finalize;
 776
 777   surf_network_model->suspend = surf_action_suspend;
 778   surf_network_model->resume = surf_action_resume;
 779   surf_network_model->is_suspended = surf_action_is_suspended;
 780   surf_cpu_model->set_max_duration = surf_action_set_max_duration;
 781
 782   surf_network_model->extension.network.communicate = net_communicate;
 783   surf_network_model->extension.network.get_route = net_get_route;
 784   surf_network_model->extension.network.get_link_bandwidth =
 785       net_get_link_bandwidth;
 786   surf_network_model->extension.network.get_link_latency =
 787       net_get_link_latency;
 788   surf_network_model->extension.network.link_shared = net_link_shared;
 789   surf_network_model->extension.network.add_traces = net_add_traces;
 790   surf_network_model->extension.network.create_resource =
 791       net_create_resource;
 792
 793   if (!surf_network_model->model_private->maxmin_system)
 794     surf_network_model->model_private->maxmin_system = lmm_system_new(surf_network_model->model_private->selective_update);
 795
 796   routing_model_create(net_create_resource("__loopback__",
 797                                            498000000, NULL, 0.000015, NULL,
 798                                            SURF_RESOURCE_ON, NULL,
 799                                            SURF_LINK_FATPIPE, NULL));
 800
 801   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 802     surf_network_model->model_private->action_heap = xbt_heap_new(8, NULL);
 803     xbt_heap_set_update_callback(surf_network_model->model_private->action_heap,
 804                                  surf_action_lmm_update_index_heap);
 805     surf_network_model->model_private->modified_set =
 806         xbt_swag_new(xbt_swag_offset(comm, generic_lmm_action.action_list_hookup));
 807     surf_network_model->model_private->maxmin_system->keep_track = surf_network_model->model_private->modified_set;
 808   }
 809
 810   surf_network_model->gap_remove = NULL;
 811 }
 812
 813 /************************************************************************/
 814 /* New model based on LV08 and experimental results of MPI ping-pongs   */
 815 /************************************************************************/
 816 /* @Inproceedings{smpi_ipdps, */
 817 /*  author={Pierre-Nicolas Clauss and Mark Stillwell and Stéphane Genaud and Frédéric Suter and Henri Casanova and Martin Quinson}, */
 818 /*  title={Single Node On-Line Simulation of {MPI} Applications with SMPI}, */
 819 /*  booktitle={25th IEEE International Parallel and Distributed Processing Symposium (IPDPS'11)}, */
 820 /*  address={Anchorage (Alaska) USA}, */
 821 /*  month=may, */
 822 /*  year={2011} */
 823 /*  } */
 824 void surf_network_model_init_SMPI(void)
 825 {
 826
 827   if (surf_network_model)
 828     return;
 829
 830   surf_network_model_init_internal();
 831   latency_factor_callback = &smpi_latency_factor;
 832   bandwidth_factor_callback = &smpi_bandwidth_factor;
 833   bandwidth_constraint_callback = &smpi_bandwidth_constraint;
 834   gap_append = &smpi_gap_append;
 835   surf_network_model->gap_remove = &smpi_gap_remove;
 836   net_define_callbacks();
 837   xbt_dynar_push(model_list, &surf_network_model);
 838   network_solve = lmm_solve;
 839
 840   xbt_cfg_setdefault_double(_surf_cfg_set, "network/sender_gap", 10e-6);
 841   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 842 }
 843
 844 /************************************************************************/
 845 /* New model based on optimizations discussed during Pedro Velho's thesis*/
 846 /************************************************************************/
 847 /* @techreport{VELHO:2011:HAL-00646896:1, */
 848 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
 849 /*      title = {{Flow-level network models: have we reached the limits?}}, */
 850 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
 851 /*      type = {Rapport de recherche}, */
 852 /*      institution = {INRIA}, */
 853 /*      number = {RR-7821}, */
 854 /*      year = {2011}, */
 855 /*      month = Nov, */
 856 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
 857 /*  } */
 858 void surf_network_model_init_LegrandVelho(void)
 859 {
 860   if (surf_network_model)
 861     return;
 862
 863   surf_network_model_init_internal();
 864   net_define_callbacks();
 865   xbt_dynar_push(model_list, &surf_network_model);
 866   network_solve = lmm_solve;
 867
 868   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor",
 869                             13.01);
 870   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 871                             0.97);
 872   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 20537);
 873 }
 874
 875 /***************************************************************************/
 876 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 877 /***************************************************************************/
 878 /* @TechReport{      rr-lip2002-40, */
 879 /*   author        = {Henri Casanova and Loris Marchal}, */
 880 /*   institution   = {LIP}, */
 881 /*   title         = {A Network Model for Simulation of Grid Application}, */
 882 /*   number        = {2002-40}, */
 883 /*   month         = {oct}, */
 884 /*   year          = {2002} */
 885 /* } */
 886 void surf_network_model_init_CM02(void)
 887 {
 888
 889   if (surf_network_model)
 890     return;
 891
 892   surf_network_model_init_internal();
 893   net_define_callbacks();
 894   xbt_dynar_push(model_list, &surf_network_model);
 895   network_solve = lmm_solve;
 896
 897   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 1.0);
 898   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 899                             1.0);
 900   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 0.0);
 901 }
 902
 903 /***************************************************************************/
 904 /* The models from Steven H. Low                                           */
 905 /***************************************************************************/
 906 /* @article{Low03,                                                         */
 907 /*   author={Steven H. Low},                                               */
 908 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
 909 /*   year={2003},                                                          */
 910 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
 911 /*    volume={11}, number={4},                                             */
 912 /*  }                                                                      */
 913 void surf_network_model_init_Reno(void)
 914 {
 915   if (surf_network_model)
 916     return;
 917
 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
 932
 933 void surf_network_model_init_Reno2(void)
 934 {
 935   if (surf_network_model)
 936     return;
 937
 938   surf_network_model_init_internal();
 939   net_define_callbacks();
 940
 941   xbt_dynar_push(model_list, &surf_network_model);
 942   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 943                                     func_reno2_fpi);
 944   network_solve = lagrange_solve;
 945
 946   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 947   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 948                             0.92);
 949   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S_parameter",
 950                             8775);
 951 }
 952
 953 void surf_network_model_init_Vegas(void)
 954 {
 955   if (surf_network_model)
 956     return;
 957
 958   surf_network_model_init_internal();
 959   net_define_callbacks();
 960
 961   xbt_dynar_push(model_list, &surf_network_model);
 962   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 963                                     func_vegas_fpi);
 964   network_solve = lagrange_solve;
 965
 966   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 967   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 968                             0.92);
 969   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 970 }