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
  81 static int factor_cmp(const void *pa, const void *pb)
  82 {
  83   return (((s_smpi_factor_t*)pa)->factor > ((s_smpi_factor_t*)pb)->factor);
  84 }
  85
  86
  87 static xbt_dynar_t parse_factor(const char *smpi_coef_string)
  88 {
  89   char *value = NULL;
  90   unsigned int iter = 0;
  91   s_smpi_factor_t fact;
  92   xbt_dynar_t smpi_factor, radical_elements, radical_elements2 = NULL;
  93
  94   smpi_factor = xbt_dynar_new(sizeof(s_smpi_factor_t), NULL);
  95   radical_elements = xbt_str_split(smpi_coef_string, ";");
  96   xbt_dynar_foreach(radical_elements, iter, value) {
  97
  98     radical_elements2 = xbt_str_split(value, ":");
  99     if (xbt_dynar_length(radical_elements2) != 2)
 100       xbt_die("Malformed radical for smpi factor!");
 101     fact.factor = atol(xbt_dynar_get_as(radical_elements2, 0, char *));
 102     fact.value = atof(xbt_dynar_get_as(radical_elements2, 1, char *));
 103     xbt_dynar_push_as(smpi_factor, s_smpi_factor_t, fact);
 104     XBT_DEBUG("smpi_factor:\t%ld : %f", fact.factor, fact.value);
 105     xbt_dynar_free(&radical_elements2);
 106   }
 107   xbt_dynar_free(&radical_elements);
 108   iter=0;
 109   xbt_dynar_sort(smpi_factor, &factor_cmp);
 110   xbt_dynar_foreach(smpi_factor, iter, fact) {
 111     XBT_DEBUG("ordered smpi_factor:\t%ld : %f", fact.factor, fact.value);
 112
 113   }
 114   return smpi_factor;
 115 }
 116
 117 static double smpi_bandwidth_factor(double size)
 118 {
 119   if (!smpi_bw_factor)
 120     smpi_bw_factor =
 121         parse_factor(xbt_cfg_get_string(_surf_cfg_set, "smpi/bw_factor"));
 122
 123   unsigned int iter = 0;
 124   s_smpi_factor_t fact;
 125   double current=1.0;
 126   xbt_dynar_foreach(smpi_bw_factor, iter, fact) {
 127     if (size <= fact.factor) {
 128       XBT_DEBUG("%lf <= %ld return %f", size, fact.factor, current);
 129       return current;
 130     }else
 131       current=fact.value;
 132   }
 133
 134   return 1.0;
 135 }
 136
 137 static double smpi_latency_factor(double size)
 138 {
 139   if (!smpi_lat_factor)
 140     smpi_lat_factor =
 141         parse_factor(xbt_cfg_get_string(_surf_cfg_set, "smpi/lat_factor"));
 142
 143   unsigned int iter = 0;
 144   s_smpi_factor_t fact;
 145   double current=1.0;
 146   xbt_dynar_foreach(smpi_lat_factor, iter, fact) {
 147     if (size <= fact.factor) {
 148       XBT_DEBUG("%lf <= %ld return %f", size, fact.factor, current);
 149       return current;
 150     }else
 151       current=fact.value;
 152   }
 153
 154   return 1.0;
 155 }
 156
 157 /**--------- <copy/paste C code snippet in surf/network.c> -----------*/
 158
 159 static double smpi_bandwidth_constraint(double rate, double bound,
 160                                         double size)
 161 {
 162   return rate < 0 ? bound : min(bound, rate * smpi_bandwidth_factor(size));
 163 }
 164
 165 static double (*latency_factor_callback) (double) =
 166     &constant_latency_factor;
 167 static double (*bandwidth_factor_callback) (double) =
 168     &constant_bandwidth_factor;
 169 static double (*bandwidth_constraint_callback) (double, double, double) =
 170     &constant_bandwidth_constraint;
 171
 172 static void (*gap_append) (double, const link_CM02_t,
 173                            surf_action_network_CM02_t) = NULL;
 174
 175 static void *net_create_resource(const char *name,
 176                                  double bw_initial,
 177                                  tmgr_trace_t bw_trace,
 178                                  double lat_initial,
 179                                  tmgr_trace_t lat_trace,
 180                                  e_surf_resource_state_t
 181                                  state_initial,
 182                                  tmgr_trace_t state_trace,
 183                                  e_surf_link_sharing_policy_t
 184                                  policy, xbt_dict_t properties)
 185 {
 186   link_CM02_t nw_link = (link_CM02_t)
 187       surf_resource_lmm_new(sizeof(s_link_CM02_t),
 188                             surf_network_model, name, properties,
 189                             surf_network_model->model_private->maxmin_system,
 190                             sg_bandwidth_factor * bw_initial,
 191                             history,
 192                             state_initial, state_trace,
 193                             bw_initial, bw_trace);
 194
 195   xbt_assert(!xbt_lib_get_or_null(link_lib, name, SURF_LINK_LEVEL),
 196              "Link '%s' declared several times in the platform file.",
 197              name);
 198
 199   nw_link->lat_current = lat_initial;
 200   if (lat_trace)
 201     nw_link->lat_event =
 202         tmgr_history_add_trace(history, lat_trace, 0.0, 0, nw_link);
 203
 204   if (policy == SURF_LINK_FATPIPE)
 205     lmm_constraint_shared(nw_link->lmm_resource.constraint);
 206
 207   xbt_lib_set(link_lib, name, SURF_LINK_LEVEL, nw_link);
 208   XBT_DEBUG("Create link '%s'",name);
 209
 210   return nw_link;
 211 }
 212
 213 static void net_parse_link_init(sg_platf_link_cbarg_t link)
 214 {
 215   if (link->policy == SURF_LINK_FULLDUPLEX) {
 216     char *link_id;
 217     link_id = bprintf("%s_UP", link->id);
 218     net_create_resource(link_id,
 219                         link->bandwidth,
 220                         link->bandwidth_trace,
 221                         link->latency,
 222                         link->latency_trace,
 223                         link->state,
 224                         link->state_trace, link->policy, link->properties);
 225     xbt_free(link_id);
 226     link_id = bprintf("%s_DOWN", link->id);
 227     net_create_resource(link_id,
 228                         link->bandwidth,
 229                         link->bandwidth_trace,
 230                         link->latency,
 231                         link->latency_trace,
 232                         link->state,
 233                         link->state_trace, link->policy, link->properties);
 234     xbt_free(link_id);
 235   } else {
 236     net_create_resource(link->id,
 237                         link->bandwidth,
 238                         link->bandwidth_trace,
 239                         link->latency,
 240                         link->latency_trace,
 241                         link->state,
 242                         link->state_trace, link->policy, link->properties);
 243   }
 244 }
 245
 246 static void net_add_traces(void)
 247 {
 248   xbt_dict_cursor_t cursor = NULL;
 249   char *trace_name, *elm;
 250
 251   static int called = 0;
 252   if (called)
 253     return;
 254   called = 1;
 255
 256   /* connect all traces relative to network */
 257   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 258     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 259     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 260
 261     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 262                trace_name, elm);
 263     xbt_assert(trace,
 264                "Cannot connect trace %s to link %s: trace undefined",
 265                trace_name, elm);
 266
 267     link->lmm_resource.state_event =
 268         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 269   }
 270
 271   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 272     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 273     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 274
 275     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 276                trace_name, elm);
 277     xbt_assert(trace,
 278                "Cannot connect trace %s to link %s: trace undefined",
 279                trace_name, elm);
 280
 281     link->lmm_resource.power.event =
 282         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 283   }
 284
 285   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 286     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 287     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 288
 289     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 290                trace_name, elm);
 291     xbt_assert(trace,
 292                "Cannot connect trace %s to link %s: trace undefined",
 293                trace_name, elm);
 294
 295     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 296   }
 297 }
 298
 299 static void net_define_callbacks(void)
 300 {
 301   /* Figuring out the network links */
 302   sg_platf_link_add_cb(net_parse_link_init);
 303   sg_platf_postparse_add_cb(net_add_traces);
 304 }
 305
 306 static int net_resource_used(void *resource_id)
 307 {
 308   return lmm_constraint_used(surf_network_model->model_private->maxmin_system, ((surf_resource_lmm_t)
 309                                                      resource_id)->
 310                              constraint);
 311 }
 312
 313 void net_action_recycle(surf_action_t action)
 314 {
 315   return;
 316 }
 317
 318 #ifdef HAVE_LATENCY_BOUND_TRACKING
 319 int net_get_link_latency_limited(surf_action_t action)
 320 {
 321   return action->latency_limited;
 322 }
 323 #endif
 324
 325 static double net_share_resources_full(double now)
 326 {
 327   s_surf_action_lmm_t s_action;
 328   surf_action_network_CM02_t action = NULL;
 329   xbt_swag_t running_actions =
 330       surf_network_model->states.running_action_set;
 331   double min;
 332
 333   min = generic_maxmin_share_resources(running_actions,
 334                                        xbt_swag_offset(s_action,
 335                                                        variable),
 336                                                        surf_network_model->model_private->maxmin_system,
 337                                        network_solve);
 338
 339 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 340
 341   xbt_swag_foreach(action, running_actions) {
 342 #ifdef HAVE_LATENCY_BOUND_TRACKING
 343     if (lmm_is_variable_limited_by_latency(GENERIC_LMM_ACTION(action).variable)) {
 344       action->latency_limited = 1;
 345     } else {
 346       action->latency_limited = 0;
 347     }
 348 #endif
 349     if (action->latency > 0) {
 350       min = (min < 0) ? action->latency : min(min, action->latency);
 351     }
 352   }
 353
 354   XBT_DEBUG("Min of share resources %f", min);
 355
 356   return min;
 357 }
 358
 359 static double net_share_resources_lazy(double now)
 360 {
 361   return generic_share_resources_lazy(now, surf_network_model);
 362 }
 363
 364 static void net_update_actions_state_full(double now, double delta)
 365 {
 366   generic_update_actions_state_full(now, delta, surf_network_model);
 367 }
 368
 369 static void net_update_actions_state_lazy(double now, double delta)
 370 {
 371   generic_update_actions_state_lazy(now, delta, surf_network_model);
 372 }
 373
 374 static void net_update_resource_state(void *id,
 375                                       tmgr_trace_event_t event_type,
 376                                       double value, double date)
 377 {
 378   link_CM02_t nw_link = id;
 379   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 380   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 381   /*     value, event_type); */
 382
 383   if (event_type == nw_link->lmm_resource.power.event) {
 384     double delta =
 385         sg_weight_S_parameter / value - sg_weight_S_parameter /
 386         (nw_link->lmm_resource.power.peak *
 387          nw_link->lmm_resource.power.scale);
 388     lmm_variable_t var = NULL;
 389     lmm_element_t elem = NULL;
 390     surf_action_network_CM02_t action = NULL;
 391
 392     nw_link->lmm_resource.power.peak = value;
 393     lmm_update_constraint_bound(surf_network_model->model_private->maxmin_system,
 394                                 nw_link->lmm_resource.constraint,
 395                                 sg_bandwidth_factor *
 396                                 (nw_link->lmm_resource.power.peak *
 397                                  nw_link->lmm_resource.power.scale));
 398 #ifdef HAVE_TRACING
 399     TRACE_surf_link_set_bandwidth(date,
 400                                   (char
 401                                    *) (((nw_link->lmm_resource).
 402                                         generic_resource).name),
 403                                   sg_bandwidth_factor *
 404                                   (nw_link->lmm_resource.power.peak *
 405                                    nw_link->lmm_resource.power.scale));
 406 #endif
 407     if (sg_weight_S_parameter > 0) {
 408       while ((var = lmm_get_var_from_cnst
 409               (surf_network_model->model_private->maxmin_system, nw_link->lmm_resource.constraint,
 410                &elem))) {
 411         action = lmm_variable_id(var);
 412         action->weight += delta;
 413         if (!(GENERIC_LMM_ACTION(action).suspended))
 414           lmm_update_variable_weight(surf_network_model->model_private->maxmin_system,
 415                                      GENERIC_LMM_ACTION(action).variable, action->weight);
 416       }
 417     }
 418     if (tmgr_trace_event_free(event_type))
 419       nw_link->lmm_resource.power.event = NULL;
 420   } else if (event_type == nw_link->lat_event) {
 421     double delta = value - nw_link->lat_current;
 422     lmm_variable_t var = NULL;
 423     lmm_element_t elem = NULL;
 424     surf_action_network_CM02_t action = NULL;
 425
 426     nw_link->lat_current = value;
 427     while ((var = lmm_get_var_from_cnst
 428             (surf_network_model->model_private->maxmin_system, nw_link->lmm_resource.constraint,
 429              &elem))) {
 430       action = lmm_variable_id(var);
 431       action->lat_current += delta;
 432       action->weight += delta;
 433       if (action->rate < 0)
 434         lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 435                                   sg_tcp_gamma / (2.0 *
 436                                                   action->lat_current));
 437       else {
 438         lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 439                                   min(action->rate,
 440                                       sg_tcp_gamma / (2.0 *
 441                                                       action->
 442                                                       lat_current)));
 443
 444         if (action->rate < sg_tcp_gamma / (2.0 * action->lat_current)) {
 445           XBT_INFO("Flow is limited BYBANDWIDTH");
 446         } else {
 447           XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 448                    action->lat_current);
 449         }
 450       }
 451       if (!(GENERIC_LMM_ACTION(action).suspended))
 452         lmm_update_variable_weight(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 453                                    action->weight);
 454
 455     }
 456     if (tmgr_trace_event_free(event_type))
 457       nw_link->lat_event = NULL;
 458   } else if (event_type == nw_link->lmm_resource.state_event) {
 459     if (value > 0)
 460       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 461     else {
 462       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 463       lmm_variable_t var = NULL;
 464       lmm_element_t elem = NULL;
 465
 466       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 467       while ((var = lmm_get_var_from_cnst
 468               (surf_network_model->model_private->maxmin_system, cnst, &elem))) {
 469         surf_action_t action = lmm_variable_id(var);
 470
 471         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 472             surf_action_state_get(action) == SURF_ACTION_READY) {
 473           action->finish = date;
 474           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 475         }
 476       }
 477     }
 478     if (tmgr_trace_event_free(event_type))
 479       nw_link->lmm_resource.state_event = NULL;
 480   } else {
 481     XBT_CRITICAL("Unknown event ! \n");
 482     xbt_abort();
 483   }
 484
 485   XBT_DEBUG
 486       ("There were a resource state event, need to update actions related to the constraint (%p)",
 487        nw_link->lmm_resource.constraint);
 488   return;
 489 }
 490
 491
 492 static surf_action_t net_communicate(sg_routing_edge_t src,
 493                                      sg_routing_edge_t dst,
 494                                      double size, double rate)
 495 {
 496   unsigned int i;
 497   link_CM02_t link;
 498   int failed = 0;
 499   surf_action_network_CM02_t action = NULL;
 500   double bandwidth_bound;
 501   double latency = 0.0;
 502   xbt_dynar_t back_route = NULL;
 503   int constraints_per_variable = 0;
 504
 505   xbt_dynar_t route = xbt_dynar_new(sizeof(sg_routing_link_t), NULL);
 506
 507   XBT_IN("(%s,%s,%g,%g)", src->name, dst->name, size, rate);
 508
 509   routing_get_route_and_latency(src, dst, &route, &latency);
 510   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 511              "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 512              src->name, dst->name);
 513
 514   xbt_dynar_foreach(route, i, link) {
 515     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 516       failed = 1;
 517       break;
 518     }
 519   }
 520   if (sg_network_crosstraffic == 1) {
 521     routing_get_route_and_latency(dst, src, &back_route, NULL);
 522     xbt_dynar_foreach(back_route, i, link) {
 523       if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 524         failed = 1;
 525         break;
 526       }
 527     }
 528   }
 529
 530   action =
 531       surf_action_new(sizeof(s_surf_action_network_CM02_t), size,
 532                       surf_network_model, failed);
 533 #ifdef HAVE_LATENCY_BOUND_TRACKING
 534   action->latency_limited = 0;
 535 #endif
 536   action->weight = action->latency = latency;
 537
 538   xbt_swag_insert(action, ((surf_action_t)action)->state_set);
 539   action->rate = rate;
 540   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 541     GENERIC_LMM_ACTION(action).index_heap = -1;
 542     GENERIC_LMM_ACTION(action).last_update = surf_get_clock();
 543   }
 544
 545   bandwidth_bound = -1.0;
 546   if (sg_weight_S_parameter > 0) {
 547     xbt_dynar_foreach(route, i, link) {
 548       action->weight +=
 549           sg_weight_S_parameter /
 550           (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 551     }
 552   }
 553   xbt_dynar_foreach(route, i, link) {
 554     double bb = bandwidth_factor_callback(size) *
 555         (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 556     bandwidth_bound =
 557         (bandwidth_bound < 0.0) ? bb : min(bandwidth_bound, bb);
 558   }
 559
 560   action->lat_current = action->latency;
 561   action->latency *= latency_factor_callback(size);
 562   action->rate =
 563       bandwidth_constraint_callback(action->rate, bandwidth_bound, size);
 564   if (gap_append) {
 565     xbt_assert(!xbt_dynar_is_empty(route),
 566                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 567
 568     link = *(link_CM02_t *) xbt_dynar_get_ptr(route, 0);
 569     gap_append(size, link, action);
 570     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 571               action, src->name, dst->name, action->sender.gap,
 572               action->latency);
 573   }
 574
 575   constraints_per_variable = xbt_dynar_length(route);
 576   if (back_route != NULL)
 577     constraints_per_variable += xbt_dynar_length(back_route);
 578
 579   if (action->latency > 0) {
 580     GENERIC_LMM_ACTION(action).variable =
 581         lmm_variable_new(surf_network_model->model_private->maxmin_system, action, 0.0, -1.0,
 582                          constraints_per_variable);
 583     if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 584       // add to the heap the event when the latency is payed
 585       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 586                 action->latency + GENERIC_LMM_ACTION(action).last_update);
 587       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,
 588                   xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 589     }
 590   } else
 591     GENERIC_LMM_ACTION(action).variable =
 592         lmm_variable_new(surf_network_model->model_private->maxmin_system, action, 1.0, -1.0,
 593                          constraints_per_variable);
 594
 595   if (action->rate < 0) {
 596     lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 597                               (action->lat_current > 0) ?
 598                               sg_tcp_gamma / (2.0 *
 599                                               action->lat_current) : -1.0);
 600   } else {
 601     lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 602                               (action->lat_current > 0) ?
 603                               min(action->rate,
 604                                   sg_tcp_gamma / (2.0 *
 605                                                   action->lat_current))
 606                               : action->rate);
 607   }
 608
 609   xbt_dynar_foreach(route, i, link) {
 610     lmm_expand(surf_network_model->model_private->maxmin_system, link->lmm_resource.constraint,
 611                GENERIC_LMM_ACTION(action).variable, 1.0);
 612   }
 613
 614   if (sg_network_crosstraffic == 1) {
 615     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 616     xbt_dynar_foreach(back_route, i, link) {
 617       lmm_expand(surf_network_model->model_private->maxmin_system, link->lmm_resource.constraint,
 618                  GENERIC_LMM_ACTION(action).variable, .05);
 619     }
 620   }
 621
 622   xbt_dynar_free(&route);
 623   XBT_OUT();
 624
 625   return (surf_action_t) action;
 626 }
 627
 628 static xbt_dynar_t net_get_route(void *src, void *dst)
 629 {
 630   xbt_dynar_t route = NULL;
 631   routing_get_route_and_latency(src, dst, &route, NULL);
 632   return route;
 633 }
 634
 635 static double net_get_link_bandwidth(const void *link)
 636 {
 637   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 638   return lmm->power.peak * lmm->power.scale;
 639 }
 640
 641 static double net_get_link_latency(const void *link)
 642 {
 643   return ((link_CM02_t) link)->lat_current;
 644 }
 645
 646 static int net_link_shared(const void *link)
 647 {
 648   return
 649       lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 650 }
 651
 652 static void net_finalize(void)
 653 {
 654   lmm_system_free(surf_network_model->model_private->maxmin_system);
 655   surf_network_model->model_private->maxmin_system = NULL;
 656
 657   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 658     xbt_heap_free(surf_network_model->model_private->action_heap);
 659     xbt_swag_free(surf_network_model->model_private->modified_set);
 660   }
 661
 662   surf_model_exit(surf_network_model);
 663   surf_network_model = NULL;
 664
 665   if (smpi_bw_factor)
 666     xbt_dynar_free(&smpi_bw_factor);
 667   if (smpi_lat_factor)
 668     xbt_dynar_free(&smpi_lat_factor);
 669 }
 670
 671 static void smpi_gap_append(double size, const link_CM02_t link,
 672                             surf_action_network_CM02_t action)
 673 {
 674   const char *src = link->lmm_resource.generic_resource.name;
 675   xbt_fifo_t fifo;
 676   surf_action_network_CM02_t last_action;
 677   double bw;
 678
 679   if (sg_sender_gap > 0.0) {
 680     if (!gap_lookup) {
 681       gap_lookup = xbt_dict_new();
 682     }
 683     fifo = (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup, src);
 684     action->sender.gap = 0.0;
 685     if (fifo && xbt_fifo_size(fifo) > 0) {
 686       /* Compute gap from last send */
 687       last_action =
 688           (surf_action_network_CM02_t)
 689           xbt_fifo_get_item_content(xbt_fifo_get_last_item(fifo));
 690       bw = net_get_link_bandwidth(link);
 691       action->sender.gap =
 692           max(sg_sender_gap,last_action->sender.size / bw);
 693       action->latency += action->sender.gap;
 694     }
 695     /* Append action as last send */
 696     action->sender.link_name = link->lmm_resource.generic_resource.name;
 697     fifo =
 698         (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup,
 699                                           action->sender.link_name);
 700     if (!fifo) {
 701       fifo = xbt_fifo_new();
 702       xbt_dict_set(gap_lookup, action->sender.link_name, fifo, NULL);
 703     }
 704     action->sender.fifo_item = xbt_fifo_push(fifo, action);
 705     action->sender.size = size;
 706   }
 707 }
 708
 709 static void smpi_gap_remove(surf_action_lmm_t lmm_action)
 710 {
 711   xbt_fifo_t fifo;
 712   size_t size;
 713   surf_action_network_CM02_t action = (surf_action_network_CM02_t)(lmm_action);
 714
 715   if (sg_sender_gap > 0.0 && action->sender.link_name
 716       && action->sender.fifo_item) {
 717     fifo =
 718         (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup,
 719                                           action->sender.link_name);
 720     xbt_fifo_remove_item(fifo, action->sender.fifo_item);
 721     size = xbt_fifo_size(fifo);
 722     if (size == 0) {
 723       xbt_fifo_free(fifo);
 724       xbt_dict_remove(gap_lookup, action->sender.link_name);
 725       size = xbt_dict_length(gap_lookup);
 726       if (size == 0) {
 727         xbt_dict_free(&gap_lookup);
 728       }
 729     }
 730   }
 731 }
 732
 733 static void set_update_mechanism(void)
 734 {
 735   char *optim = xbt_cfg_get_string(_surf_cfg_set, "network/optim");
 736   int select =
 737       xbt_cfg_get_int(_surf_cfg_set, "network/maxmin_selective_update");
 738
 739   if (!strcmp(optim, "Full")) {
 740     surf_network_model->model_private->update_mechanism = UM_FULL;
 741     surf_network_model->model_private->selective_update = select;
 742   } else if (!strcmp(optim, "Lazy")) {
 743     surf_network_model->model_private->update_mechanism = UM_LAZY;
 744     surf_network_model->model_private->selective_update = 1;
 745     xbt_assert((select == 1)
 746                ||
 747                (xbt_cfg_is_default_value
 748                 (_surf_cfg_set, "network/maxmin_selective_update")),
 749                "Disabling selective update while using the lazy update mechanism is dumb!");
 750   } else {
 751     xbt_die("Unsupported optimization (%s) for this model", optim);
 752   }
 753 }
 754
 755 static void surf_network_model_init_internal(void)
 756 {
 757   s_surf_action_network_CM02_t comm;
 758   surf_network_model = surf_model_init();
 759
 760   set_update_mechanism();
 761
 762   surf_network_model->name = "network";
 763   surf_network_model->action_unref = surf_action_unref;
 764   surf_network_model->action_cancel = surf_action_cancel;
 765   surf_network_model->action_recycle = net_action_recycle;
 766
 767   surf_network_model->get_remains = surf_action_get_remains;
 768
 769 #ifdef HAVE_LATENCY_BOUND_TRACKING
 770   surf_network_model->get_latency_limited = net_get_link_latency_limited;
 771 #endif
 772 #ifdef HAVE_TRACING
 773   surf_network_model->set_category = surf_action_set_category;
 774 #endif
 775
 776   surf_network_model->model_private->resource_used = net_resource_used;
 777   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 778     surf_network_model->model_private->share_resources =
 779         net_share_resources_lazy;
 780     surf_network_model->model_private->update_actions_state =
 781         net_update_actions_state_lazy;
 782   } else if (surf_network_model->model_private->update_mechanism == UM_FULL) {
 783     surf_network_model->model_private->share_resources =
 784         net_share_resources_full;
 785     surf_network_model->model_private->update_actions_state =
 786         net_update_actions_state_full;
 787   }
 788
 789   surf_network_model->model_private->update_resource_state =
 790       net_update_resource_state;
 791   surf_network_model->model_private->finalize = net_finalize;
 792
 793   surf_network_model->suspend = surf_action_suspend;
 794   surf_network_model->resume = surf_action_resume;
 795   surf_network_model->is_suspended = surf_action_is_suspended;
 796   surf_cpu_model->set_max_duration = surf_action_set_max_duration;
 797
 798   surf_network_model->extension.network.communicate = net_communicate;
 799   surf_network_model->extension.network.get_route = net_get_route;
 800   surf_network_model->extension.network.get_link_bandwidth =
 801       net_get_link_bandwidth;
 802   surf_network_model->extension.network.get_link_latency =
 803       net_get_link_latency;
 804   surf_network_model->extension.network.link_shared = net_link_shared;
 805   surf_network_model->extension.network.add_traces = net_add_traces;
 806   surf_network_model->extension.network.create_resource =
 807       net_create_resource;
 808
 809   if (!surf_network_model->model_private->maxmin_system)
 810     surf_network_model->model_private->maxmin_system = lmm_system_new(surf_network_model->model_private->selective_update);
 811
 812   routing_model_create(net_create_resource("__loopback__",
 813                                            498000000, NULL, 0.000015, NULL,
 814                                            SURF_RESOURCE_ON, NULL,
 815                                            SURF_LINK_FATPIPE, NULL));
 816
 817   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 818     surf_network_model->model_private->action_heap = xbt_heap_new(8, NULL);
 819     xbt_heap_set_update_callback(surf_network_model->model_private->action_heap,
 820                                  surf_action_lmm_update_index_heap);
 821     surf_network_model->model_private->modified_set =
 822         xbt_swag_new(xbt_swag_offset(comm, generic_lmm_action.action_list_hookup));
 823     surf_network_model->model_private->maxmin_system->keep_track = surf_network_model->model_private->modified_set;
 824   }
 825
 826   surf_network_model->gap_remove = NULL;
 827 }
 828
 829 /************************************************************************/
 830 /* New model based on LV08 and experimental results of MPI ping-pongs   */
 831 /************************************************************************/
 832 /* @Inproceedings{smpi_ipdps, */
 833 /*  author={Pierre-Nicolas Clauss and Mark Stillwell and Stéphane Genaud and Frédéric Suter and Henri Casanova and Martin Quinson}, */
 834 /*  title={Single Node On-Line Simulation of {MPI} Applications with SMPI}, */
 835 /*  booktitle={25th IEEE International Parallel and Distributed Processing Symposium (IPDPS'11)}, */
 836 /*  address={Anchorage (Alaska) USA}, */
 837 /*  month=may, */
 838 /*  year={2011} */
 839 /*  } */
 840 void surf_network_model_init_SMPI(void)
 841 {
 842
 843   if (surf_network_model)
 844     return;
 845
 846   surf_network_model_init_internal();
 847   latency_factor_callback = &smpi_latency_factor;
 848   bandwidth_factor_callback = &smpi_bandwidth_factor;
 849   bandwidth_constraint_callback = &smpi_bandwidth_constraint;
 850   gap_append = &smpi_gap_append;
 851   surf_network_model->gap_remove = &smpi_gap_remove;
 852   net_define_callbacks();
 853   xbt_dynar_push(model_list, &surf_network_model);
 854   network_solve = lmm_solve;
 855
 856   xbt_cfg_setdefault_double(_surf_cfg_set, "network/sender_gap", 10e-6);
 857   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 858 }
 859
 860 /************************************************************************/
 861 /* New model based on optimizations discussed during Pedro Velho's thesis*/
 862 /************************************************************************/
 863 /* @techreport{VELHO:2011:HAL-00646896:1, */
 864 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
 865 /*      title = {{Flow-level network models: have we reached the limits?}}, */
 866 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
 867 /*      type = {Rapport de recherche}, */
 868 /*      institution = {INRIA}, */
 869 /*      number = {RR-7821}, */
 870 /*      year = {2011}, */
 871 /*      month = Nov, */
 872 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
 873 /*  } */
 874 void surf_network_model_init_LegrandVelho(void)
 875 {
 876   if (surf_network_model)
 877     return;
 878
 879   surf_network_model_init_internal();
 880   net_define_callbacks();
 881   xbt_dynar_push(model_list, &surf_network_model);
 882   network_solve = lmm_solve;
 883
 884   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor",
 885                             13.01);
 886   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 887                             0.97);
 888   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 20537);
 889 }
 890
 891 /***************************************************************************/
 892 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 893 /***************************************************************************/
 894 /* @TechReport{      rr-lip2002-40, */
 895 /*   author        = {Henri Casanova and Loris Marchal}, */
 896 /*   institution   = {LIP}, */
 897 /*   title         = {A Network Model for Simulation of Grid Application}, */
 898 /*   number        = {2002-40}, */
 899 /*   month         = {oct}, */
 900 /*   year          = {2002} */
 901 /* } */
 902 void surf_network_model_init_CM02(void)
 903 {
 904
 905   if (surf_network_model)
 906     return;
 907
 908   surf_network_model_init_internal();
 909   net_define_callbacks();
 910   xbt_dynar_push(model_list, &surf_network_model);
 911   network_solve = lmm_solve;
 912
 913   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 1.0);
 914   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 915                             1.0);
 916   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 0.0);
 917 }
 918
 919 /***************************************************************************/
 920 /* The models from Steven H. Low                                           */
 921 /***************************************************************************/
 922 /* @article{Low03,                                                         */
 923 /*   author={Steven H. Low},                                               */
 924 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
 925 /*   year={2003},                                                          */
 926 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
 927 /*    volume={11}, number={4},                                             */
 928 /*  }                                                                      */
 929 void surf_network_model_init_Reno(void)
 930 {
 931   if (surf_network_model)
 932     return;
 933
 934   surf_network_model_init_internal();
 935   net_define_callbacks();
 936
 937   xbt_dynar_push(model_list, &surf_network_model);
 938   lmm_set_default_protocol_function(func_reno_f, func_reno_fp,
 939                                     func_reno_fpi);
 940   network_solve = lagrange_solve;
 941
 942   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 943   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 944                             0.92);
 945   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 946 }
 947
 948
 949 void surf_network_model_init_Reno2(void)
 950 {
 951   if (surf_network_model)
 952     return;
 953
 954   surf_network_model_init_internal();
 955   net_define_callbacks();
 956
 957   xbt_dynar_push(model_list, &surf_network_model);
 958   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 959                                     func_reno2_fpi);
 960   network_solve = lagrange_solve;
 961
 962   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 963   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 964                             0.92);
 965   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S_parameter",
 966                             8775);
 967 }
 968
 969 void surf_network_model_init_Vegas(void)
 970 {
 971   if (surf_network_model)
 972     return;
 973
 974   surf_network_model_init_internal();
 975   net_define_callbacks();
 976
 977   xbt_dynar_push(model_list, &surf_network_model);
 978   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 979                                     func_vegas_fpi);
 980   network_solve = lagrange_solve;
 981
 982   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 983   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 984                             0.92);
 985   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 986 }