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