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(surf_cfg_get_string("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   XBT_DEBUG("%lf > %ld return %f", size, fact.factor, current);
 134
 135   return current;
 136 }
 137
 138 static double smpi_latency_factor(double size)
 139 {
 140   if (!smpi_lat_factor)
 141     smpi_lat_factor =
 142         parse_factor(surf_cfg_get_string("smpi/lat_factor"));
 143
 144   unsigned int iter = 0;
 145   s_smpi_factor_t fact;
 146   double current=1.0;
 147   xbt_dynar_foreach(smpi_lat_factor, iter, fact) {
 148     if (size <= fact.factor) {
 149       XBT_DEBUG("%lf <= %ld return %f", size, fact.factor, current);
 150       return current;
 151     }else
 152       current=fact.value;
 153   }
 154   XBT_DEBUG("%lf > %ld return %f", size, fact.factor, current);
 155
 156   return current;
 157 }
 158
 159 /**--------- <copy/paste C code snippet in surf/network.c> -----------*/
 160
 161 static double smpi_bandwidth_constraint(double rate, double bound,
 162                                         double size)
 163 {
 164   return rate < 0 ? bound : min(bound, rate * smpi_bandwidth_factor(size));
 165 }
 166
 167 static double (*latency_factor_callback) (double) =
 168     &constant_latency_factor;
 169 static double (*bandwidth_factor_callback) (double) =
 170     &constant_bandwidth_factor;
 171 static double (*bandwidth_constraint_callback) (double, double, double) =
 172     &constant_bandwidth_constraint;
 173
 174 static void (*gap_append) (double, const link_CM02_t,
 175                            surf_action_network_CM02_t) = NULL;
 176
 177 static void *net_create_resource(const char *name,
 178                                  double bw_initial,
 179                                  tmgr_trace_t bw_trace,
 180                                  double lat_initial,
 181                                  tmgr_trace_t lat_trace,
 182                                  e_surf_resource_state_t
 183                                  state_initial,
 184                                  tmgr_trace_t state_trace,
 185                                  e_surf_link_sharing_policy_t
 186                                  policy, xbt_dict_t properties)
 187 {
 188   link_CM02_t nw_link = (link_CM02_t)
 189       surf_resource_lmm_new(sizeof(s_link_CM02_t),
 190                             surf_network_model, name, properties,
 191                             surf_network_model->model_private->maxmin_system,
 192                             sg_bandwidth_factor * bw_initial,
 193                             history,
 194                             state_initial, state_trace,
 195                             bw_initial, bw_trace);
 196
 197   xbt_assert(!xbt_lib_get_or_null(link_lib, name, SURF_LINK_LEVEL),
 198              "Link '%s' declared several times in the platform file.",
 199              name);
 200
 201   nw_link->lat_current = lat_initial;
 202   if (lat_trace)
 203     nw_link->lat_event =
 204         tmgr_history_add_trace(history, lat_trace, 0.0, 0, nw_link);
 205
 206   if (policy == SURF_LINK_FATPIPE)
 207     lmm_constraint_shared(nw_link->lmm_resource.constraint);
 208
 209   xbt_lib_set(link_lib, name, SURF_LINK_LEVEL, nw_link);
 210   XBT_DEBUG("Create link '%s'",name);
 211
 212   return nw_link;
 213 }
 214
 215 static void net_parse_link_init(sg_platf_link_cbarg_t link)
 216 {
 217   if (link->policy == SURF_LINK_FULLDUPLEX) {
 218     char *link_id;
 219     link_id = bprintf("%s_UP", link->id);
 220     net_create_resource(link_id,
 221                         link->bandwidth,
 222                         link->bandwidth_trace,
 223                         link->latency,
 224                         link->latency_trace,
 225                         link->state,
 226                         link->state_trace, link->policy, link->properties);
 227     xbt_free(link_id);
 228     link_id = bprintf("%s_DOWN", link->id);
 229     net_create_resource(link_id,
 230                         link->bandwidth,
 231                         link->bandwidth_trace,
 232                         link->latency,
 233                         link->latency_trace,
 234                         link->state,
 235                         link->state_trace, link->policy, link->properties);
 236     xbt_free(link_id);
 237   } else {
 238     net_create_resource(link->id,
 239                         link->bandwidth,
 240                         link->bandwidth_trace,
 241                         link->latency,
 242                         link->latency_trace,
 243                         link->state,
 244                         link->state_trace, link->policy, link->properties);
 245   }
 246 }
 247
 248 static void net_add_traces(void)
 249 {
 250   xbt_dict_cursor_t cursor = NULL;
 251   char *trace_name, *elm;
 252
 253   static int called = 0;
 254   if (called)
 255     return;
 256   called = 1;
 257
 258   /* connect all traces relative to network */
 259   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 260     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 261     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 262
 263     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 264                trace_name, elm);
 265     xbt_assert(trace,
 266                "Cannot connect trace %s to link %s: trace undefined",
 267                trace_name, elm);
 268
 269     link->lmm_resource.state_event =
 270         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 271   }
 272
 273   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 274     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 275     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 276
 277     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 278                trace_name, elm);
 279     xbt_assert(trace,
 280                "Cannot connect trace %s to link %s: trace undefined",
 281                trace_name, elm);
 282
 283     link->lmm_resource.power.event =
 284         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 285   }
 286
 287   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 288     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 289     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 290
 291     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 292                trace_name, elm);
 293     xbt_assert(trace,
 294                "Cannot connect trace %s to link %s: trace undefined",
 295                trace_name, elm);
 296
 297     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 298   }
 299 }
 300
 301 static void net_define_callbacks(void)
 302 {
 303   /* Figuring out the network links */
 304   sg_platf_link_add_cb(net_parse_link_init);
 305   sg_platf_postparse_add_cb(net_add_traces);
 306 }
 307
 308 static int net_resource_used(void *resource_id)
 309 {
 310   return lmm_constraint_used(surf_network_model->model_private->maxmin_system, ((surf_resource_lmm_t)
 311                                                      resource_id)->
 312                              constraint);
 313 }
 314
 315 void net_action_recycle(surf_action_t action)
 316 {
 317   return;
 318 }
 319
 320 #ifdef HAVE_LATENCY_BOUND_TRACKING
 321 int net_get_link_latency_limited(surf_action_t action)
 322 {
 323   return action->latency_limited;
 324 }
 325 #endif
 326
 327 static double net_share_resources_full(double now)
 328 {
 329   s_surf_action_lmm_t s_action;
 330   surf_action_network_CM02_t action = NULL;
 331   xbt_swag_t running_actions =
 332       surf_network_model->states.running_action_set;
 333   double min;
 334
 335   min = generic_maxmin_share_resources(running_actions,
 336                                        xbt_swag_offset(s_action,
 337                                                        variable),
 338                                                        surf_network_model->model_private->maxmin_system,
 339                                        network_solve);
 340
 341 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 342
 343   xbt_swag_foreach(action, running_actions) {
 344 #ifdef HAVE_LATENCY_BOUND_TRACKING
 345     if (lmm_is_variable_limited_by_latency(GENERIC_LMM_ACTION(action).variable)) {
 346       action->latency_limited = 1;
 347     } else {
 348       action->latency_limited = 0;
 349     }
 350 #endif
 351     if (action->latency > 0) {
 352       min = (min < 0) ? action->latency : min(min, action->latency);
 353     }
 354   }
 355
 356   XBT_DEBUG("Min of share resources %f", min);
 357
 358   return min;
 359 }
 360
 361 static double net_share_resources_lazy(double now)
 362 {
 363   return generic_share_resources_lazy(now, surf_network_model);
 364 }
 365
 366 static void net_update_actions_state_full(double now, double delta)
 367 {
 368   generic_update_actions_state_full(now, delta, surf_network_model);
 369 }
 370
 371 static void net_update_actions_state_lazy(double now, double delta)
 372 {
 373   generic_update_actions_state_lazy(now, delta, surf_network_model);
 374 }
 375
 376 static void net_update_resource_state(void *id,
 377                                       tmgr_trace_event_t event_type,
 378                                       double value, double date)
 379 {
 380   link_CM02_t nw_link = id;
 381   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 382   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 383   /*     value, event_type); */
 384
 385   if (event_type == nw_link->lmm_resource.power.event) {
 386     double delta =
 387         sg_weight_S_parameter / value - sg_weight_S_parameter /
 388         (nw_link->lmm_resource.power.peak *
 389          nw_link->lmm_resource.power.scale);
 390     lmm_variable_t var = NULL;
 391     lmm_element_t elem = NULL;
 392     surf_action_network_CM02_t action = NULL;
 393
 394     nw_link->lmm_resource.power.peak = value;
 395     lmm_update_constraint_bound(surf_network_model->model_private->maxmin_system,
 396                                 nw_link->lmm_resource.constraint,
 397                                 sg_bandwidth_factor *
 398                                 (nw_link->lmm_resource.power.peak *
 399                                  nw_link->lmm_resource.power.scale));
 400 #ifdef HAVE_TRACING
 401     TRACE_surf_link_set_bandwidth(date,
 402                                   (char
 403                                    *) (((nw_link->lmm_resource).
 404                                         generic_resource).name),
 405                                   sg_bandwidth_factor *
 406                                   (nw_link->lmm_resource.power.peak *
 407                                    nw_link->lmm_resource.power.scale));
 408 #endif
 409     if (sg_weight_S_parameter > 0) {
 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->weight += delta;
 415         if (!(GENERIC_LMM_ACTION(action).suspended))
 416           lmm_update_variable_weight(surf_network_model->model_private->maxmin_system,
 417                                      GENERIC_LMM_ACTION(action).variable, action->weight);
 418       }
 419     }
 420     if (tmgr_trace_event_free(event_type))
 421       nw_link->lmm_resource.power.event = NULL;
 422   } else if (event_type == nw_link->lat_event) {
 423     double delta = value - nw_link->lat_current;
 424     lmm_variable_t var = NULL;
 425     lmm_element_t elem = NULL;
 426     surf_action_network_CM02_t action = NULL;
 427
 428     nw_link->lat_current = value;
 429     while ((var = lmm_get_var_from_cnst
 430             (surf_network_model->model_private->maxmin_system, nw_link->lmm_resource.constraint,
 431              &elem))) {
 432       action = lmm_variable_id(var);
 433       action->lat_current += delta;
 434       action->weight += delta;
 435       if (action->rate < 0)
 436         lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 437                                   sg_tcp_gamma / (2.0 *
 438                                                   action->lat_current));
 439       else {
 440         lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 441                                   min(action->rate,
 442                                       sg_tcp_gamma / (2.0 *
 443                                                       action->
 444                                                       lat_current)));
 445
 446         if (action->rate < sg_tcp_gamma / (2.0 * action->lat_current)) {
 447           XBT_INFO("Flow is limited BYBANDWIDTH");
 448         } else {
 449           XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 450                    action->lat_current);
 451         }
 452       }
 453       if (!(GENERIC_LMM_ACTION(action).suspended))
 454         lmm_update_variable_weight(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 455                                    action->weight);
 456
 457     }
 458     if (tmgr_trace_event_free(event_type))
 459       nw_link->lat_event = NULL;
 460   } else if (event_type == nw_link->lmm_resource.state_event) {
 461     if (value > 0)
 462       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 463     else {
 464       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 465       lmm_variable_t var = NULL;
 466       lmm_element_t elem = NULL;
 467
 468       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 469       while ((var = lmm_get_var_from_cnst
 470               (surf_network_model->model_private->maxmin_system, cnst, &elem))) {
 471         surf_action_t action = lmm_variable_id(var);
 472
 473         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 474             surf_action_state_get(action) == SURF_ACTION_READY) {
 475           action->finish = date;
 476           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 477         }
 478       }
 479     }
 480     if (tmgr_trace_event_free(event_type))
 481       nw_link->lmm_resource.state_event = NULL;
 482   } else {
 483     XBT_CRITICAL("Unknown event ! \n");
 484     xbt_abort();
 485   }
 486
 487   XBT_DEBUG
 488       ("There were a resource state event, need to update actions related to the constraint (%p)",
 489        nw_link->lmm_resource.constraint);
 490   return;
 491 }
 492
 493
 494 static surf_action_t net_communicate(sg_routing_edge_t src,
 495                                      sg_routing_edge_t dst,
 496                                      double size, double rate)
 497 {
 498   unsigned int i;
 499   link_CM02_t link;
 500   int failed = 0;
 501   surf_action_network_CM02_t action = NULL;
 502   double bandwidth_bound;
 503   double latency = 0.0;
 504   xbt_dynar_t back_route = NULL;
 505   int constraints_per_variable = 0;
 506
 507   xbt_dynar_t route = xbt_dynar_new(sizeof(sg_routing_link_t), NULL);
 508
 509   XBT_IN("(%s,%s,%g,%g)", src->name, dst->name, size, rate);
 510
 511   routing_get_route_and_latency(src, dst, &route, &latency);
 512   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 513              "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 514              src->name, dst->name);
 515
 516   xbt_dynar_foreach(route, i, link) {
 517     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 518       failed = 1;
 519       break;
 520     }
 521   }
 522   if (sg_network_crosstraffic == 1) {
 523     routing_get_route_and_latency(dst, src, &back_route, NULL);
 524     xbt_dynar_foreach(back_route, i, link) {
 525       if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 526         failed = 1;
 527         break;
 528       }
 529     }
 530   }
 531
 532   action =
 533       surf_action_new(sizeof(s_surf_action_network_CM02_t), size,
 534                       surf_network_model, failed);
 535 #ifdef HAVE_LATENCY_BOUND_TRACKING
 536   action->latency_limited = 0;
 537 #endif
 538   action->weight = action->latency = latency;
 539
 540   xbt_swag_insert(action, ((surf_action_t)action)->state_set);
 541   action->rate = rate;
 542   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 543     GENERIC_LMM_ACTION(action).index_heap = -1;
 544     GENERIC_LMM_ACTION(action).last_update = surf_get_clock();
 545   }
 546
 547   bandwidth_bound = -1.0;
 548   if (sg_weight_S_parameter > 0) {
 549     xbt_dynar_foreach(route, i, link) {
 550       action->weight +=
 551           sg_weight_S_parameter /
 552           (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 553     }
 554   }
 555   xbt_dynar_foreach(route, i, link) {
 556     double bb = bandwidth_factor_callback(size) *
 557         (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 558     bandwidth_bound =
 559         (bandwidth_bound < 0.0) ? bb : min(bandwidth_bound, bb);
 560   }
 561
 562   action->lat_current = action->latency;
 563   action->latency *= latency_factor_callback(size);
 564   action->rate =
 565       bandwidth_constraint_callback(action->rate, bandwidth_bound, size);
 566   if (gap_append) {
 567     xbt_assert(!xbt_dynar_is_empty(route),
 568                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 569
 570     link = *(link_CM02_t *) xbt_dynar_get_ptr(route, 0);
 571     gap_append(size, link, action);
 572     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 573               action, src->name, dst->name, action->sender.gap,
 574               action->latency);
 575   }
 576
 577   constraints_per_variable = xbt_dynar_length(route);
 578   if (back_route != NULL)
 579     constraints_per_variable += xbt_dynar_length(back_route);
 580
 581   if (action->latency > 0) {
 582     GENERIC_LMM_ACTION(action).variable =
 583         lmm_variable_new(surf_network_model->model_private->maxmin_system, action, 0.0, -1.0,
 584                          constraints_per_variable);
 585     if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 586       // add to the heap the event when the latency is payed
 587       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 588                 action->latency + GENERIC_LMM_ACTION(action).last_update);
 589       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,
 590                   xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 591     }
 592   } else
 593     GENERIC_LMM_ACTION(action).variable =
 594         lmm_variable_new(surf_network_model->model_private->maxmin_system, action, 1.0, -1.0,
 595                          constraints_per_variable);
 596
 597   if (action->rate < 0) {
 598     lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 599                               (action->lat_current > 0) ?
 600                               sg_tcp_gamma / (2.0 *
 601                                               action->lat_current) : -1.0);
 602   } else {
 603     lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 604                               (action->lat_current > 0) ?
 605                               min(action->rate,
 606                                   sg_tcp_gamma / (2.0 *
 607                                                   action->lat_current))
 608                               : action->rate);
 609   }
 610
 611   xbt_dynar_foreach(route, i, link) {
 612     lmm_expand(surf_network_model->model_private->maxmin_system, link->lmm_resource.constraint,
 613                GENERIC_LMM_ACTION(action).variable, 1.0);
 614   }
 615
 616   if (sg_network_crosstraffic == 1) {
 617     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 618     xbt_dynar_foreach(back_route, i, link) {
 619       lmm_expand(surf_network_model->model_private->maxmin_system, link->lmm_resource.constraint,
 620                  GENERIC_LMM_ACTION(action).variable, .05);
 621     }
 622   }
 623
 624   xbt_dynar_free(&route);
 625   XBT_OUT();
 626
 627   return (surf_action_t) action;
 628 }
 629
 630 static xbt_dynar_t net_get_route(void *src, void *dst)
 631 {
 632   xbt_dynar_t route = NULL;
 633   routing_get_route_and_latency(src, dst, &route, NULL);
 634   return route;
 635 }
 636
 637 static double net_get_link_bandwidth(const void *link)
 638 {
 639   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 640   return lmm->power.peak * lmm->power.scale;
 641 }
 642
 643 static double net_get_link_latency(const void *link)
 644 {
 645   return ((link_CM02_t) link)->lat_current;
 646 }
 647
 648 static int net_link_shared(const void *link)
 649 {
 650   return
 651       lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 652 }
 653
 654 static void net_finalize(void)
 655 {
 656   lmm_system_free(surf_network_model->model_private->maxmin_system);
 657   surf_network_model->model_private->maxmin_system = NULL;
 658
 659   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 660     xbt_heap_free(surf_network_model->model_private->action_heap);
 661     xbt_swag_free(surf_network_model->model_private->modified_set);
 662   }
 663
 664   surf_model_exit(surf_network_model);
 665   surf_network_model = NULL;
 666
 667   if (smpi_bw_factor)
 668     xbt_dynar_free(&smpi_bw_factor);
 669   if (smpi_lat_factor)
 670     xbt_dynar_free(&smpi_lat_factor);
 671 }
 672
 673 static void smpi_gap_append(double size, const link_CM02_t link,
 674                             surf_action_network_CM02_t action)
 675 {
 676   const char *src = link->lmm_resource.generic_resource.name;
 677   xbt_fifo_t fifo;
 678   surf_action_network_CM02_t last_action;
 679   double bw;
 680
 681   if (sg_sender_gap > 0.0) {
 682     if (!gap_lookup) {
 683       gap_lookup = xbt_dict_new();
 684     }
 685     fifo = (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup, src);
 686     action->sender.gap = 0.0;
 687     if (fifo && xbt_fifo_size(fifo) > 0) {
 688       /* Compute gap from last send */
 689       last_action =
 690           (surf_action_network_CM02_t)
 691           xbt_fifo_get_item_content(xbt_fifo_get_last_item(fifo));
 692       bw = net_get_link_bandwidth(link);
 693       action->sender.gap =
 694           max(sg_sender_gap,last_action->sender.size / bw);
 695       action->latency += action->sender.gap;
 696     }
 697     /* Append action as last send */
 698     action->sender.link_name = link->lmm_resource.generic_resource.name;
 699     fifo =
 700         (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup,
 701                                           action->sender.link_name);
 702     if (!fifo) {
 703       fifo = xbt_fifo_new();
 704       xbt_dict_set(gap_lookup, action->sender.link_name, fifo, NULL);
 705     }
 706     action->sender.fifo_item = xbt_fifo_push(fifo, action);
 707     action->sender.size = size;
 708   }
 709 }
 710
 711 static void smpi_gap_remove(surf_action_lmm_t lmm_action)
 712 {
 713   xbt_fifo_t fifo;
 714   size_t size;
 715   surf_action_network_CM02_t action = (surf_action_network_CM02_t)(lmm_action);
 716
 717   if (sg_sender_gap > 0.0 && action->sender.link_name
 718       && action->sender.fifo_item) {
 719     fifo =
 720         (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup,
 721                                           action->sender.link_name);
 722     xbt_fifo_remove_item(fifo, action->sender.fifo_item);
 723     size = xbt_fifo_size(fifo);
 724     if (size == 0) {
 725       xbt_fifo_free(fifo);
 726       xbt_dict_remove(gap_lookup, action->sender.link_name);
 727       size = xbt_dict_length(gap_lookup);
 728       if (size == 0) {
 729         xbt_dict_free(&gap_lookup);
 730       }
 731     }
 732   }
 733 }
 734
 735 static void set_update_mechanism(void)
 736 {
 737   char *optim = xbt_cfg_get_string(_surf_cfg_set, "network/optim");
 738   int select =
 739       xbt_cfg_get_int(_surf_cfg_set, "network/maxmin_selective_update");
 740
 741   if (!strcmp(optim, "Full")) {
 742     surf_network_model->model_private->update_mechanism = UM_FULL;
 743     surf_network_model->model_private->selective_update = select;
 744   } else if (!strcmp(optim, "Lazy")) {
 745     surf_network_model->model_private->update_mechanism = UM_LAZY;
 746     surf_network_model->model_private->selective_update = 1;
 747     xbt_assert((select == 1)
 748                ||
 749                (xbt_cfg_is_default_value
 750                 (_surf_cfg_set, "network/maxmin_selective_update")),
 751                "Disabling selective update while using the lazy update mechanism is dumb!");
 752   } else {
 753     xbt_die("Unsupported optimization (%s) for this model", optim);
 754   }
 755 }
 756
 757 static void surf_network_model_init_internal(void)
 758 {
 759   s_surf_action_network_CM02_t comm;
 760   surf_network_model = surf_model_init();
 761
 762   set_update_mechanism();
 763
 764   surf_network_model->name = "network";
 765   surf_network_model->action_unref = surf_action_unref;
 766   surf_network_model->action_cancel = surf_action_cancel;
 767   surf_network_model->action_recycle = net_action_recycle;
 768
 769   surf_network_model->get_remains = surf_action_get_remains;
 770
 771 #ifdef HAVE_LATENCY_BOUND_TRACKING
 772   surf_network_model->get_latency_limited = net_get_link_latency_limited;
 773 #endif
 774 #ifdef HAVE_TRACING
 775   surf_network_model->set_category = surf_action_set_category;
 776 #endif
 777
 778   surf_network_model->model_private->resource_used = net_resource_used;
 779   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 780     surf_network_model->model_private->share_resources =
 781         net_share_resources_lazy;
 782     surf_network_model->model_private->update_actions_state =
 783         net_update_actions_state_lazy;
 784   } else if (surf_network_model->model_private->update_mechanism == UM_FULL) {
 785     surf_network_model->model_private->share_resources =
 786         net_share_resources_full;
 787     surf_network_model->model_private->update_actions_state =
 788         net_update_actions_state_full;
 789   }
 790
 791   surf_network_model->model_private->update_resource_state =
 792       net_update_resource_state;
 793   surf_network_model->model_private->finalize = net_finalize;
 794
 795   surf_network_model->suspend = surf_action_suspend;
 796   surf_network_model->resume = surf_action_resume;
 797   surf_network_model->is_suspended = surf_action_is_suspended;
 798   surf_cpu_model->set_max_duration = surf_action_set_max_duration;
 799
 800   surf_network_model->extension.network.communicate = net_communicate;
 801   surf_network_model->extension.network.get_route = net_get_route;
 802   surf_network_model->extension.network.get_link_bandwidth =
 803       net_get_link_bandwidth;
 804   surf_network_model->extension.network.get_link_latency =
 805       net_get_link_latency;
 806   surf_network_model->extension.network.link_shared = net_link_shared;
 807   surf_network_model->extension.network.add_traces = net_add_traces;
 808   surf_network_model->extension.network.create_resource =
 809       net_create_resource;
 810
 811   if (!surf_network_model->model_private->maxmin_system)
 812     surf_network_model->model_private->maxmin_system = lmm_system_new(surf_network_model->model_private->selective_update);
 813
 814   routing_model_create(net_create_resource("__loopback__",
 815                                            498000000, NULL, 0.000015, NULL,
 816                                            SURF_RESOURCE_ON, NULL,
 817                                            SURF_LINK_FATPIPE, NULL));
 818
 819   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 820     surf_network_model->model_private->action_heap = xbt_heap_new(8, NULL);
 821     xbt_heap_set_update_callback(surf_network_model->model_private->action_heap,
 822                                  surf_action_lmm_update_index_heap);
 823     surf_network_model->model_private->modified_set =
 824         xbt_swag_new(xbt_swag_offset(comm, generic_lmm_action.action_list_hookup));
 825     surf_network_model->model_private->maxmin_system->keep_track = surf_network_model->model_private->modified_set;
 826   }
 827
 828   surf_network_model->gap_remove = NULL;
 829 }
 830
 831 /************************************************************************/
 832 /* New model based on LV08 and experimental results of MPI ping-pongs   */
 833 /************************************************************************/
 834 /* @Inproceedings{smpi_ipdps, */
 835 /*  author={Pierre-Nicolas Clauss and Mark Stillwell and Stéphane Genaud and Frédéric Suter and Henri Casanova and Martin Quinson}, */
 836 /*  title={Single Node On-Line Simulation of {MPI} Applications with SMPI}, */
 837 /*  booktitle={25th IEEE International Parallel and Distributed Processing Symposium (IPDPS'11)}, */
 838 /*  address={Anchorage (Alaska) USA}, */
 839 /*  month=may, */
 840 /*  year={2011} */
 841 /*  } */
 842 void surf_network_model_init_SMPI(void)
 843 {
 844
 845   if (surf_network_model)
 846     return;
 847
 848   surf_network_model_init_internal();
 849   latency_factor_callback = &smpi_latency_factor;
 850   bandwidth_factor_callback = &smpi_bandwidth_factor;
 851   bandwidth_constraint_callback = &smpi_bandwidth_constraint;
 852   gap_append = &smpi_gap_append;
 853   surf_network_model->gap_remove = &smpi_gap_remove;
 854   net_define_callbacks();
 855   xbt_dynar_push(model_list, &surf_network_model);
 856   network_solve = lmm_solve;
 857
 858   xbt_cfg_setdefault_double(_surf_cfg_set, "network/sender_gap", 10e-6);
 859   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 860 }
 861
 862 /************************************************************************/
 863 /* New model based on optimizations discussed during Pedro Velho's thesis*/
 864 /************************************************************************/
 865 /* @techreport{VELHO:2011:HAL-00646896:1, */
 866 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
 867 /*      title = {{Flow-level network models: have we reached the limits?}}, */
 868 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
 869 /*      type = {Rapport de recherche}, */
 870 /*      institution = {INRIA}, */
 871 /*      number = {RR-7821}, */
 872 /*      year = {2011}, */
 873 /*      month = Nov, */
 874 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
 875 /*  } */
 876 void surf_network_model_init_LegrandVelho(void)
 877 {
 878   if (surf_network_model)
 879     return;
 880
 881   surf_network_model_init_internal();
 882   net_define_callbacks();
 883   xbt_dynar_push(model_list, &surf_network_model);
 884   network_solve = lmm_solve;
 885
 886   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor",
 887                             13.01);
 888   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 889                             0.97);
 890   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 20537);
 891 }
 892
 893 /***************************************************************************/
 894 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 895 /***************************************************************************/
 896 /* @TechReport{      rr-lip2002-40, */
 897 /*   author        = {Henri Casanova and Loris Marchal}, */
 898 /*   institution   = {LIP}, */
 899 /*   title         = {A Network Model for Simulation of Grid Application}, */
 900 /*   number        = {2002-40}, */
 901 /*   month         = {oct}, */
 902 /*   year          = {2002} */
 903 /* } */
 904 void surf_network_model_init_CM02(void)
 905 {
 906
 907   if (surf_network_model)
 908     return;
 909
 910   surf_network_model_init_internal();
 911   net_define_callbacks();
 912   xbt_dynar_push(model_list, &surf_network_model);
 913   network_solve = lmm_solve;
 914
 915   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 1.0);
 916   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 917                             1.0);
 918   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 0.0);
 919 }
 920
 921 /***************************************************************************/
 922 /* The models from Steven H. Low                                           */
 923 /***************************************************************************/
 924 /* @article{Low03,                                                         */
 925 /*   author={Steven H. Low},                                               */
 926 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
 927 /*   year={2003},                                                          */
 928 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
 929 /*    volume={11}, number={4},                                             */
 930 /*  }                                                                      */
 931 void surf_network_model_init_Reno(void)
 932 {
 933   if (surf_network_model)
 934     return;
 935
 936   surf_network_model_init_internal();
 937   net_define_callbacks();
 938
 939   xbt_dynar_push(model_list, &surf_network_model);
 940   lmm_set_default_protocol_function(func_reno_f, func_reno_fp,
 941                                     func_reno_fpi);
 942   network_solve = lagrange_solve;
 943
 944   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 945   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 946                             0.92);
 947   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 948 }
 949
 950
 951 void surf_network_model_init_Reno2(void)
 952 {
 953   if (surf_network_model)
 954     return;
 955
 956   surf_network_model_init_internal();
 957   net_define_callbacks();
 958
 959   xbt_dynar_push(model_list, &surf_network_model);
 960   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 961                                     func_reno2_fpi);
 962   network_solve = lagrange_solve;
 963
 964   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 965   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 966                             0.92);
 967   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S_parameter",
 968                             8775);
 969 }
 970
 971 void surf_network_model_init_Vegas(void)
 972 {
 973   if (surf_network_model)
 974     return;
 975
 976   surf_network_model_init_internal();
 977   net_define_callbacks();
 978
 979   xbt_dynar_push(model_list, &surf_network_model);
 980   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 981                                     func_vegas_fpi);
 982   network_solve = lagrange_solve;
 983
 984   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
 985   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 986                             0.92);
 987   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 988 }