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) 2004-2013. 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 #include "simgrid/sg_config.h"
  26
  27 #undef GENERIC_LMM_ACTION
  28 #undef GENERIC_ACTION
  29 #define GENERIC_LMM_ACTION(action) (action)->generic_lmm_action
  30 #define GENERIC_ACTION(action) GENERIC_LMM_ACTION(action).generic_action
  31
  32
  33 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_network, surf,
  34                                 "Logging specific to the SURF network module");
  35
  36 surf_model_t surf_network_model = NULL;
  37 static void (*network_solve) (lmm_system_t) = NULL;
  38
  39 xbt_dynar_t smpi_bw_factor = NULL;
  40 xbt_dynar_t smpi_lat_factor = NULL;
  41
  42 typedef struct s_smpi_factor *smpi_factor_t;
  43 typedef struct s_smpi_factor {
  44   long factor;
  45   double value;
  46 } s_smpi_factor_t;
  47
  48
  49 double sg_sender_gap = 0.0;
  50 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
  51 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
  52 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
  53
  54 double sg_tcp_gamma = 0.0;
  55 int sg_network_crosstraffic = 0;
  56
  57 xbt_dict_t gap_lookup = NULL;
  58
  59 /******************************************************************************/
  60 /*                           Factors callbacks                                */
  61 /******************************************************************************/
  62 static double constant_latency_factor(double size)
  63 {
  64   return sg_latency_factor;
  65 }
  66
  67 static double constant_bandwidth_factor(double size)
  68 {
  69   return sg_bandwidth_factor;
  70 }
  71
  72 static double constant_bandwidth_constraint(double rate, double bound,
  73                                             double size)
  74 {
  75   return rate;
  76 }
  77
  78 /**********************/
  79 /*   SMPI callbacks   */
  80 /**********************/
  81
  82 static int factor_cmp(const void *pa, const void *pb)
  83 {
  84   return (((s_smpi_factor_t*)pa)->factor > ((s_smpi_factor_t*)pb)->factor) ? 1 :
  85          (((s_smpi_factor_t*)pa)->factor < ((s_smpi_factor_t*)pb)->factor) ? -1 : 0;
  86 }
  87
  88
  89 static xbt_dynar_t parse_factor(const char *smpi_coef_string)
  90 {
  91   char *value = NULL;
  92   unsigned int iter = 0;
  93   s_smpi_factor_t fact;
  94   xbt_dynar_t smpi_factor, radical_elements, radical_elements2 = NULL;
  95
  96   smpi_factor = xbt_dynar_new(sizeof(s_smpi_factor_t), NULL);
  97   radical_elements = xbt_str_split(smpi_coef_string, ";");
  98   xbt_dynar_foreach(radical_elements, iter, value) {
  99
 100     radical_elements2 = xbt_str_split(value, ":");
 101     if (xbt_dynar_length(radical_elements2) != 2)
 102       xbt_die("Malformed radical for smpi factor!");
 103     fact.factor = atol(xbt_dynar_get_as(radical_elements2, 0, char *));
 104     fact.value = atof(xbt_dynar_get_as(radical_elements2, 1, char *));
 105     xbt_dynar_push_as(smpi_factor, s_smpi_factor_t, fact);
 106     XBT_DEBUG("smpi_factor:\t%ld : %f", fact.factor, fact.value);
 107     xbt_dynar_free(&radical_elements2);
 108   }
 109   xbt_dynar_free(&radical_elements);
 110   iter=0;
 111   xbt_dynar_sort(smpi_factor, &factor_cmp);
 112   xbt_dynar_foreach(smpi_factor, iter, fact) {
 113     XBT_DEBUG("ordered smpi_factor:\t%ld : %f", fact.factor, fact.value);
 114
 115   }
 116   return smpi_factor;
 117 }
 118
 119 static double smpi_bandwidth_factor(double size)
 120 {
 121   if (!smpi_bw_factor)
 122     smpi_bw_factor =
 123         parse_factor(sg_cfg_get_string("smpi/bw_factor"));
 124
 125   unsigned int iter = 0;
 126   s_smpi_factor_t fact;
 127   double current=1.0;
 128   xbt_dynar_foreach(smpi_bw_factor, iter, fact) {
 129     if (size <= fact.factor) {
 130       XBT_DEBUG("%f <= %ld return %f", size, fact.factor, current);
 131       return current;
 132     }else
 133       current=fact.value;
 134   }
 135   XBT_DEBUG("%f > %ld return %f", size, fact.factor, current);
 136
 137   return current;
 138 }
 139
 140 static double smpi_latency_factor(double size)
 141 {
 142   if (!smpi_lat_factor)
 143     smpi_lat_factor =
 144         parse_factor(sg_cfg_get_string("smpi/lat_factor"));
 145
 146   unsigned int iter = 0;
 147   s_smpi_factor_t fact;
 148   double current=1.0;
 149   xbt_dynar_foreach(smpi_lat_factor, iter, fact) {
 150     if (size <= fact.factor) {
 151       XBT_DEBUG("%f <= %ld return %f", size, fact.factor, current);
 152       return current;
 153     }else
 154       current=fact.value;
 155   }
 156   XBT_DEBUG("%f > %ld return %f", size, fact.factor, current);
 157
 158   return current;
 159 }
 160
 161 /**--------- <copy/paste C code snippet in surf/network.c> -----------*/
 162
 163 static double smpi_bandwidth_constraint(double rate, double bound,
 164                                         double size)
 165 {
 166   return rate < 0 ? bound : min(bound, rate * smpi_bandwidth_factor(size));
 167 }
 168
 169 static double (*latency_factor_callback) (double) =
 170     &constant_latency_factor;
 171 static double (*bandwidth_factor_callback) (double) =
 172     &constant_bandwidth_factor;
 173 static double (*bandwidth_constraint_callback) (double, double, double) =
 174     &constant_bandwidth_constraint;
 175
 176 static void (*gap_append) (double, const link_CM02_t,
 177                            surf_action_network_CM02_t) = NULL;
 178
 179 static void *net_create_resource(const char *name,
 180                                  double bw_initial,
 181                                  tmgr_trace_t bw_trace,
 182                                  double lat_initial,
 183                                  tmgr_trace_t lat_trace,
 184                                  e_surf_resource_state_t
 185                                  state_initial,
 186                                  tmgr_trace_t state_trace,
 187                                  e_surf_link_sharing_policy_t
 188                                  policy, xbt_dict_t properties)
 189 {
 190   link_CM02_t nw_link = (link_CM02_t)
 191       surf_resource_lmm_new(sizeof(s_link_CM02_t),
 192                             surf_network_model, name, properties,
 193                             surf_network_model->model_private->maxmin_system,
 194                             sg_bandwidth_factor * bw_initial,
 195                             history,
 196                             state_initial, state_trace,
 197                             bw_initial, bw_trace);
 198
 199   xbt_assert(!xbt_lib_get_or_null(link_lib, name, SURF_LINK_LEVEL),
 200              "Link '%s' declared several times in the platform file.",
 201              name);
 202
 203   nw_link->lat_current = lat_initial;
 204   if (lat_trace)
 205     nw_link->lat_event =
 206         tmgr_history_add_trace(history, lat_trace, 0.0, 0, nw_link);
 207
 208   if (policy == SURF_LINK_FATPIPE)
 209     lmm_constraint_shared(nw_link->lmm_resource.constraint);
 210
 211   xbt_lib_set(link_lib, name, SURF_LINK_LEVEL, nw_link);
 212   XBT_DEBUG("Create link '%s'",name);
 213
 214   return nw_link;
 215 }
 216
 217 static void net_parse_link_init(sg_platf_link_cbarg_t link)
 218 {
 219   if (link->policy == SURF_LINK_FULLDUPLEX) {
 220     char *link_id;
 221     link_id = bprintf("%s_UP", link->id);
 222     net_create_resource(link_id,
 223                         link->bandwidth,
 224                         link->bandwidth_trace,
 225                         link->latency,
 226                         link->latency_trace,
 227                         link->state,
 228                         link->state_trace, link->policy, link->properties);
 229     xbt_free(link_id);
 230     link_id = bprintf("%s_DOWN", link->id);
 231     net_create_resource(link_id,
 232                         link->bandwidth,
 233                         link->bandwidth_trace,
 234                         link->latency,
 235                         link->latency_trace,
 236                         link->state,
 237                         link->state_trace, link->policy, link->properties);
 238     xbt_free(link_id);
 239   } else {
 240     net_create_resource(link->id,
 241                         link->bandwidth,
 242                         link->bandwidth_trace,
 243                         link->latency,
 244                         link->latency_trace,
 245                         link->state,
 246                         link->state_trace, link->policy, link->properties);
 247   }
 248 }
 249
 250 static void net_add_traces(void)
 251 {
 252   xbt_dict_cursor_t cursor = NULL;
 253   char *trace_name, *elm;
 254
 255   static int called = 0;
 256   if (called)
 257     return;
 258   called = 1;
 259
 260   /* connect all traces relative to network */
 261   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 262     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 263     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 264
 265     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 266                trace_name, elm);
 267     xbt_assert(trace,
 268                "Cannot connect trace %s to link %s: trace undefined",
 269                trace_name, elm);
 270
 271     link->lmm_resource.state_event =
 272         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 273   }
 274
 275   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 276     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 277     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 278
 279     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 280                trace_name, elm);
 281     xbt_assert(trace,
 282                "Cannot connect trace %s to link %s: trace undefined",
 283                trace_name, elm);
 284
 285     link->lmm_resource.power.event =
 286         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 287   }
 288
 289   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 290     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 291     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 292
 293     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 294                trace_name, elm);
 295     xbt_assert(trace,
 296                "Cannot connect trace %s to link %s: trace undefined",
 297                trace_name, elm);
 298
 299     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 300   }
 301 }
 302
 303 static void net_define_callbacks(void)
 304 {
 305   /* Figuring out the network links */
 306   sg_platf_link_add_cb(net_parse_link_init);
 307   sg_platf_postparse_add_cb(net_add_traces);
 308 }
 309
 310 static int net_resource_used(void *resource_id)
 311 {
 312   return lmm_constraint_used(surf_network_model->model_private->maxmin_system, ((surf_resource_lmm_t)
 313                                                      resource_id)->
 314                              constraint);
 315 }
 316
 317 void net_action_recycle(surf_action_t action)
 318 {
 319   return;
 320 }
 321
 322 #ifdef HAVE_LATENCY_BOUND_TRACKING
 323 int net_get_link_latency_limited(surf_action_t action)
 324 {
 325   return action->latency_limited;
 326 }
 327 #endif
 328
 329 static double net_share_resources_full(double now)
 330 {
 331   s_surf_action_lmm_t s_action;
 332   surf_action_network_CM02_t action = NULL;
 333   xbt_swag_t running_actions =
 334       surf_network_model->states.running_action_set;
 335   double min;
 336
 337   min = generic_maxmin_share_resources(running_actions,
 338                                        xbt_swag_offset(s_action,
 339                                                        variable),
 340                                                        surf_network_model->model_private->maxmin_system,
 341                                        network_solve);
 342
 343 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 344
 345   xbt_swag_foreach(action, running_actions) {
 346 #ifdef HAVE_LATENCY_BOUND_TRACKING
 347     if (lmm_is_variable_limited_by_latency(GENERIC_LMM_ACTION(action).variable)) {
 348       action->latency_limited = 1;
 349     } else {
 350       action->latency_limited = 0;
 351     }
 352 #endif
 353     if (action->latency > 0) {
 354       min = (min < 0) ? action->latency : min(min, action->latency);
 355     }
 356   }
 357
 358   XBT_DEBUG("Min of share resources %f", min);
 359
 360   return min;
 361 }
 362
 363 static double net_share_resources_lazy(double now)
 364 {
 365   return generic_share_resources_lazy(now, surf_network_model);
 366 }
 367
 368 static void net_update_actions_state_full(double now, double delta)
 369 {
 370   generic_update_actions_state_full(now, delta, surf_network_model);
 371 }
 372
 373 static void net_update_actions_state_lazy(double now, double delta)
 374 {
 375   generic_update_actions_state_lazy(now, delta, surf_network_model);
 376 }
 377
 378 static void net_update_resource_state(void *id,
 379                                       tmgr_trace_event_t event_type,
 380                                       double value, double date)
 381 {
 382   link_CM02_t nw_link = id;
 383   /*   printf("[" "%g" "] Asking to update network card \"%s\" with value " */
 384   /*     "%g" " for event %p\n", surf_get_clock(), nw_link->name, */
 385   /*     value, event_type); */
 386
 387   if (event_type == nw_link->lmm_resource.power.event) {
 388     double delta =
 389         sg_weight_S_parameter / value - sg_weight_S_parameter /
 390         (nw_link->lmm_resource.power.peak *
 391          nw_link->lmm_resource.power.scale);
 392     lmm_variable_t var = NULL;
 393     lmm_element_t elem = NULL;
 394     surf_action_network_CM02_t action = NULL;
 395
 396     nw_link->lmm_resource.power.peak = value;
 397     lmm_update_constraint_bound(surf_network_model->model_private->maxmin_system,
 398                                 nw_link->lmm_resource.constraint,
 399                                 sg_bandwidth_factor *
 400                                 (nw_link->lmm_resource.power.peak *
 401                                  nw_link->lmm_resource.power.scale));
 402 #ifdef HAVE_TRACING
 403     TRACE_surf_link_set_bandwidth(date,
 404                                   (char
 405                                    *) (((nw_link->lmm_resource).
 406                                         generic_resource).name),
 407                                   sg_bandwidth_factor *
 408                                   (nw_link->lmm_resource.power.peak *
 409                                    nw_link->lmm_resource.power.scale));
 410 #endif
 411     if (sg_weight_S_parameter > 0) {
 412       while ((var = lmm_get_var_from_cnst
 413               (surf_network_model->model_private->maxmin_system, nw_link->lmm_resource.constraint,
 414                &elem))) {
 415         action = lmm_variable_id(var);
 416         action->weight += delta;
 417         if (!(GENERIC_LMM_ACTION(action).suspended))
 418           lmm_update_variable_weight(surf_network_model->model_private->maxmin_system,
 419                                      GENERIC_LMM_ACTION(action).variable, action->weight);
 420       }
 421     }
 422     if (tmgr_trace_event_free(event_type))
 423       nw_link->lmm_resource.power.event = NULL;
 424   } else if (event_type == nw_link->lat_event) {
 425     double delta = value - nw_link->lat_current;
 426     lmm_variable_t var = NULL;
 427     lmm_element_t elem = NULL;
 428     surf_action_network_CM02_t action = NULL;
 429
 430     nw_link->lat_current = value;
 431     while ((var = lmm_get_var_from_cnst
 432             (surf_network_model->model_private->maxmin_system, nw_link->lmm_resource.constraint,
 433              &elem))) {
 434       action = lmm_variable_id(var);
 435       action->lat_current += delta;
 436       action->weight += delta;
 437       if (action->rate < 0)
 438         lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 439                                   sg_tcp_gamma / (2.0 *
 440                                                   action->lat_current));
 441       else {
 442         lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 443                                   min(action->rate,
 444                                       sg_tcp_gamma / (2.0 *
 445                                                       action->
 446                                                       lat_current)));
 447
 448         if (action->rate < sg_tcp_gamma / (2.0 * action->lat_current)) {
 449           XBT_INFO("Flow is limited BYBANDWIDTH");
 450         } else {
 451           XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 452                    action->lat_current);
 453         }
 454       }
 455       if (!(GENERIC_LMM_ACTION(action).suspended))
 456         lmm_update_variable_weight(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 457                                    action->weight);
 458
 459     }
 460     if (tmgr_trace_event_free(event_type))
 461       nw_link->lat_event = NULL;
 462   } else if (event_type == nw_link->lmm_resource.state_event) {
 463     if (value > 0)
 464       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 465     else {
 466       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 467       lmm_variable_t var = NULL;
 468       lmm_element_t elem = NULL;
 469
 470       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 471       while ((var = lmm_get_var_from_cnst
 472               (surf_network_model->model_private->maxmin_system, cnst, &elem))) {
 473         surf_action_t action = lmm_variable_id(var);
 474
 475         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 476             surf_action_state_get(action) == SURF_ACTION_READY) {
 477           action->finish = date;
 478           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 479         }
 480       }
 481     }
 482     if (tmgr_trace_event_free(event_type))
 483       nw_link->lmm_resource.state_event = NULL;
 484   } else {
 485     XBT_CRITICAL("Unknown event ! \n");
 486     xbt_abort();
 487   }
 488
 489   XBT_DEBUG
 490       ("There were a resource state event, need to update actions related to the constraint (%p)",
 491        nw_link->lmm_resource.constraint);
 492   return;
 493 }
 494
 495
 496 static surf_action_t net_communicate(sg_routing_edge_t src,
 497                                      sg_routing_edge_t dst,
 498                                      double size, double rate)
 499 {
 500   unsigned int i;
 501   link_CM02_t link;
 502   int failed = 0;
 503   surf_action_network_CM02_t action = NULL;
 504   double bandwidth_bound;
 505   double latency = 0.0;
 506   xbt_dynar_t back_route = NULL;
 507   int constraints_per_variable = 0;
 508
 509   xbt_dynar_t route = xbt_dynar_new(sizeof(sg_routing_link_t), NULL);
 510
 511   XBT_IN("(%s,%s,%g,%g)", src->name, dst->name, size, rate);
 512
 513   routing_get_route_and_latency(src, dst, &route, &latency);
 514   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 515              "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 516              src->name, dst->name);
 517
 518   xbt_dynar_foreach(route, i, link) {
 519     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 520       failed = 1;
 521       break;
 522     }
 523   }
 524   if (sg_network_crosstraffic == 1) {
 525     routing_get_route_and_latency(dst, src, &back_route, NULL);
 526     xbt_dynar_foreach(back_route, i, link) {
 527       if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 528         failed = 1;
 529         break;
 530       }
 531     }
 532   }
 533
 534   action =
 535       surf_action_new(sizeof(s_surf_action_network_CM02_t), size,
 536                       surf_network_model, failed);
 537 #ifdef HAVE_LATENCY_BOUND_TRACKING
 538   action->latency_limited = 0;
 539 #endif
 540   action->weight = action->latency = latency;
 541
 542   xbt_swag_insert(action, ((surf_action_t)action)->state_set);
 543   action->rate = rate;
 544   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 545     GENERIC_LMM_ACTION(action).index_heap = -1;
 546     GENERIC_LMM_ACTION(action).last_update = surf_get_clock();
 547   }
 548
 549   bandwidth_bound = -1.0;
 550   if (sg_weight_S_parameter > 0) {
 551     xbt_dynar_foreach(route, i, link) {
 552       action->weight +=
 553           sg_weight_S_parameter /
 554           (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 555     }
 556   }
 557   xbt_dynar_foreach(route, i, link) {
 558     double bb = bandwidth_factor_callback(size) *
 559         (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 560     bandwidth_bound =
 561         (bandwidth_bound < 0.0) ? bb : min(bandwidth_bound, bb);
 562   }
 563
 564   action->lat_current = action->latency;
 565   action->latency *= latency_factor_callback(size);
 566   action->rate =
 567       bandwidth_constraint_callback(action->rate, bandwidth_bound, size);
 568   if (gap_append) {
 569     xbt_assert(!xbt_dynar_is_empty(route),
 570                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 571
 572     link = *(link_CM02_t *) xbt_dynar_get_ptr(route, 0);
 573     gap_append(size, link, action);
 574     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 575               action, src->name, dst->name, action->sender.gap,
 576               action->latency);
 577   }
 578
 579   constraints_per_variable = xbt_dynar_length(route);
 580   if (back_route != NULL)
 581     constraints_per_variable += xbt_dynar_length(back_route);
 582
 583   if (action->latency > 0) {
 584     GENERIC_LMM_ACTION(action).variable =
 585         lmm_variable_new(surf_network_model->model_private->maxmin_system, action, 0.0, -1.0,
 586                          constraints_per_variable);
 587     if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 588       // add to the heap the event when the latency is payed
 589       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 590                 action->latency + GENERIC_LMM_ACTION(action).last_update);
 591       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,
 592                   xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 593     }
 594   } else
 595     GENERIC_LMM_ACTION(action).variable =
 596         lmm_variable_new(surf_network_model->model_private->maxmin_system, action, 1.0, -1.0,
 597                          constraints_per_variable);
 598
 599   if (action->rate < 0) {
 600     lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 601                               (action->lat_current > 0) ?
 602                               sg_tcp_gamma / (2.0 *
 603                                               action->lat_current) : -1.0);
 604   } else {
 605     lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 606                               (action->lat_current > 0) ?
 607                               min(action->rate,
 608                                   sg_tcp_gamma / (2.0 *
 609                                                   action->lat_current))
 610                               : action->rate);
 611   }
 612
 613   xbt_dynar_foreach(route, i, link) {
 614     lmm_expand(surf_network_model->model_private->maxmin_system, link->lmm_resource.constraint,
 615                GENERIC_LMM_ACTION(action).variable, 1.0);
 616   }
 617
 618   if (sg_network_crosstraffic == 1) {
 619     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 620     xbt_dynar_foreach(back_route, i, link) {
 621       lmm_expand(surf_network_model->model_private->maxmin_system, link->lmm_resource.constraint,
 622                  GENERIC_LMM_ACTION(action).variable, .05);
 623     }
 624   }
 625
 626   xbt_dynar_free(&route);
 627   XBT_OUT();
 628
 629   return (surf_action_t) action;
 630 }
 631
 632 static xbt_dynar_t net_get_route(void *src, void *dst)
 633 {
 634   xbt_dynar_t route = NULL;
 635   routing_get_route_and_latency(src, dst, &route, NULL);
 636   return route;
 637 }
 638
 639 static double net_get_link_bandwidth(const void *link)
 640 {
 641   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 642   return lmm->power.peak * lmm->power.scale;
 643 }
 644
 645 static double net_get_link_latency(const void *link)
 646 {
 647   return ((link_CM02_t) link)->lat_current;
 648 }
 649
 650 static int net_link_shared(const void *link)
 651 {
 652   return
 653       lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 654 }
 655
 656 static void net_finalize(void)
 657 {
 658   lmm_system_free(surf_network_model->model_private->maxmin_system);
 659   surf_network_model->model_private->maxmin_system = NULL;
 660
 661   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 662     xbt_heap_free(surf_network_model->model_private->action_heap);
 663     xbt_swag_free(surf_network_model->model_private->modified_set);
 664   }
 665
 666   surf_model_exit(surf_network_model);
 667   surf_network_model = NULL;
 668
 669   xbt_dict_free(&gap_lookup);
 670   xbt_dynar_free(&smpi_bw_factor);
 671   xbt_dynar_free(&smpi_lat_factor);
 672 }
 673
 674 static void smpi_gap_append(double size, const link_CM02_t link,
 675                             surf_action_network_CM02_t action)
 676 {
 677   const char *src = link->lmm_resource.generic_resource.name;
 678   xbt_fifo_t fifo;
 679   //surf_action_network_CM02_t last_action;
 680   //double bw;
 681
 682   if (sg_sender_gap > 0.0) {
 683     if (!gap_lookup) {
 684       gap_lookup = xbt_dict_new_homogeneous(NULL);
 685     }
 686     fifo = (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup, src);
 687     action->sender.gap = 0.0;
 688     if (fifo && xbt_fifo_size(fifo) > 0) {
 689       /* Compute gap from last send */
 690       /*last_action =
 691           (surf_action_network_CM02_t)
 692           xbt_fifo_get_item_content(xbt_fifo_get_last_item(fifo));*/
 693      // bw = net_get_link_bandwidth(link);
 694       action->sender.gap = sg_sender_gap;
 695         /*  max(sg_sender_gap,last_action->sender.size / bw);*/
 696       action->latency += action->sender.gap;
 697     }
 698     /* Append action as last send */
 699     /*action->sender.link_name = link->lmm_resource.generic_resource.name;
 700     fifo =
 701         (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup,
 702                                           action->sender.link_name);
 703     if (!fifo) {
 704       fifo = xbt_fifo_new();
 705       xbt_dict_set(gap_lookup, action->sender.link_name, fifo, NULL);
 706     }
 707     action->sender.fifo_item = xbt_fifo_push(fifo, action);*/
 708     action->sender.size = size;
 709   }
 710 }
 711
 712 static void smpi_gap_remove(surf_action_lmm_t lmm_action)
 713 {
 714   xbt_fifo_t fifo;
 715   size_t size;
 716   surf_action_network_CM02_t action = (surf_action_network_CM02_t)(lmm_action);
 717
 718   if (sg_sender_gap > 0.0 && action->sender.link_name
 719       && action->sender.fifo_item) {
 720     fifo =
 721         (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup,
 722                                           action->sender.link_name);
 723     xbt_fifo_remove_item(fifo, action->sender.fifo_item);
 724     size = xbt_fifo_size(fifo);
 725     if (size == 0) {
 726       xbt_fifo_free(fifo);
 727       xbt_dict_remove(gap_lookup, action->sender.link_name);
 728       size = xbt_dict_length(gap_lookup);
 729       if (size == 0) {
 730         xbt_dict_free(&gap_lookup);
 731       }
 732     }
 733   }
 734 }
 735
 736 static void set_update_mechanism(void)
 737 {
 738   char *optim = xbt_cfg_get_string(_sg_cfg_set, "network/optim");
 739   int select =
 740       xbt_cfg_get_boolean(_sg_cfg_set, "network/maxmin_selective_update");
 741
 742   if (!strcmp(optim, "Full")) {
 743     surf_network_model->model_private->update_mechanism = UM_FULL;
 744     surf_network_model->model_private->selective_update = select;
 745   } else if (!strcmp(optim, "Lazy")) {
 746     surf_network_model->model_private->update_mechanism = UM_LAZY;
 747     surf_network_model->model_private->selective_update = 1;
 748     xbt_assert((select == 1)
 749                ||
 750                (xbt_cfg_is_default_value
 751                 (_sg_cfg_set, "network/maxmin_selective_update")),
 752                "Disabling selective update while using the lazy update mechanism is dumb!");
 753   } else {
 754     xbt_die("Unsupported optimization (%s) for this model", optim);
 755   }
 756 }
 757
 758 static void surf_network_model_init_internal(void)
 759 {
 760   s_surf_action_network_CM02_t comm;
 761   surf_network_model = surf_model_init();
 762
 763   set_update_mechanism();
 764
 765   surf_network_model->name = "network";
 766   surf_network_model->action_unref = surf_action_unref;
 767   surf_network_model->action_cancel = surf_action_cancel;
 768   surf_network_model->action_recycle = net_action_recycle;
 769
 770   surf_network_model->get_remains = surf_action_get_remains;
 771
 772 #ifdef HAVE_LATENCY_BOUND_TRACKING
 773   surf_network_model->get_latency_limited = net_get_link_latency_limited;
 774 #endif
 775 #ifdef HAVE_TRACING
 776   surf_network_model->set_category = surf_action_set_category;
 777 #endif
 778
 779   surf_network_model->model_private->resource_used = net_resource_used;
 780   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 781     surf_network_model->model_private->share_resources =
 782         net_share_resources_lazy;
 783     surf_network_model->model_private->update_actions_state =
 784         net_update_actions_state_lazy;
 785   } else if (surf_network_model->model_private->update_mechanism == UM_FULL) {
 786     surf_network_model->model_private->share_resources =
 787         net_share_resources_full;
 788     surf_network_model->model_private->update_actions_state =
 789         net_update_actions_state_full;
 790   }
 791
 792   surf_network_model->model_private->update_resource_state =
 793       net_update_resource_state;
 794   surf_network_model->model_private->finalize = net_finalize;
 795
 796   surf_network_model->suspend = surf_action_suspend;
 797   surf_network_model->resume = surf_action_resume;
 798   surf_network_model->is_suspended = surf_action_is_suspended;
 799   surf_cpu_model->set_max_duration = surf_action_set_max_duration;
 800
 801   surf_network_model->extension.network.communicate = net_communicate;
 802   surf_network_model->extension.network.get_route = net_get_route;
 803   surf_network_model->extension.network.get_link_bandwidth =
 804       net_get_link_bandwidth;
 805   surf_network_model->extension.network.get_link_latency =
 806       net_get_link_latency;
 807   surf_network_model->extension.network.link_shared = net_link_shared;
 808   surf_network_model->extension.network.add_traces = net_add_traces;
 809
 810   if (!surf_network_model->model_private->maxmin_system)
 811     surf_network_model->model_private->maxmin_system = lmm_system_new(surf_network_model->model_private->selective_update);
 812
 813   routing_model_create(net_create_resource("__loopback__",
 814                                            498000000, NULL, 0.000015, NULL,
 815                                            SURF_RESOURCE_ON, NULL,
 816                                            SURF_LINK_FATPIPE, NULL));
 817
 818   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 819     surf_network_model->model_private->action_heap = xbt_heap_new(8, NULL);
 820     xbt_heap_set_update_callback(surf_network_model->model_private->action_heap,
 821                                  surf_action_lmm_update_index_heap);
 822     surf_network_model->model_private->modified_set =
 823         xbt_swag_new(xbt_swag_offset(comm, generic_lmm_action.action_list_hookup));
 824     surf_network_model->model_private->maxmin_system->keep_track = surf_network_model->model_private->modified_set;
 825   }
 826
 827   surf_network_model->gap_remove = NULL;
 828 }
 829
 830 /************************************************************************/
 831 /* New model based on LV08 and experimental results of MPI ping-pongs   */
 832 /************************************************************************/
 833 /* @Inproceedings{smpi_ipdps, */
 834 /*  author={Pierre-Nicolas Clauss and Mark Stillwell and Stéphane Genaud and Frédéric Suter and Henri Casanova and Martin Quinson}, */
 835 /*  title={Single Node On-Line Simulation of {MPI} Applications with SMPI}, */
 836 /*  booktitle={25th IEEE International Parallel and Distributed Processing Symposium (IPDPS'11)}, */
 837 /*  address={Anchorage (Alaska) USA}, */
 838 /*  month=may, */
 839 /*  year={2011} */
 840 /*  } */
 841 void surf_network_model_init_SMPI(void)
 842 {
 843
 844   if (surf_network_model)
 845     return;
 846
 847   surf_network_model_init_internal();
 848   latency_factor_callback = &smpi_latency_factor;
 849   bandwidth_factor_callback = &smpi_bandwidth_factor;
 850   bandwidth_constraint_callback = &smpi_bandwidth_constraint;
 851   gap_append = &smpi_gap_append;
 852   surf_network_model->gap_remove = &smpi_gap_remove;
 853   net_define_callbacks();
 854   xbt_dynar_push(model_list, &surf_network_model);
 855   network_solve = lmm_solve;
 856
 857   xbt_cfg_setdefault_double(_sg_cfg_set, "network/sender_gap", 10e-6);
 858   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 859 }
 860
 861 /************************************************************************/
 862 /* New model based on optimizations discussed during Pedro Velho's thesis*/
 863 /************************************************************************/
 864 /* @techreport{VELHO:2011:HAL-00646896:1, */
 865 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
 866 /*      title = {{Flow-level network models: have we reached the limits?}}, */
 867 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
 868 /*      type = {Rapport de recherche}, */
 869 /*      institution = {INRIA}, */
 870 /*      number = {RR-7821}, */
 871 /*      year = {2011}, */
 872 /*      month = Nov, */
 873 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
 874 /*  } */
 875 void surf_network_model_init_LegrandVelho(void)
 876 {
 877   if (surf_network_model)
 878     return;
 879
 880   surf_network_model_init_internal();
 881   net_define_callbacks();
 882   xbt_dynar_push(model_list, &surf_network_model);
 883   network_solve = lmm_solve;
 884
 885   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor",
 886                             13.01);
 887   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 888                             0.97);
 889   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 20537);
 890 }
 891
 892 /***************************************************************************/
 893 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 894 /***************************************************************************/
 895 /* @TechReport{      rr-lip2002-40, */
 896 /*   author        = {Henri Casanova and Loris Marchal}, */
 897 /*   institution   = {LIP}, */
 898 /*   title         = {A Network Model for Simulation of Grid Application}, */
 899 /*   number        = {2002-40}, */
 900 /*   month         = {oct}, */
 901 /*   year          = {2002} */
 902 /* } */
 903 void surf_network_model_init_CM02(void)
 904 {
 905
 906   if (surf_network_model)
 907     return;
 908
 909   surf_network_model_init_internal();
 910   net_define_callbacks();
 911   xbt_dynar_push(model_list, &surf_network_model);
 912   network_solve = lmm_solve;
 913
 914   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 1.0);
 915   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 916                             1.0);
 917   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 0.0);
 918 }
 919
 920 /***************************************************************************/
 921 /* The models from Steven H. Low                                           */
 922 /***************************************************************************/
 923 /* @article{Low03,                                                         */
 924 /*   author={Steven H. Low},                                               */
 925 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
 926 /*   year={2003},                                                          */
 927 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
 928 /*    volume={11}, number={4},                                             */
 929 /*  }                                                                      */
 930 void surf_network_model_init_Reno(void)
 931 {
 932   if (surf_network_model)
 933     return;
 934
 935   surf_network_model_init_internal();
 936   net_define_callbacks();
 937
 938   xbt_dynar_push(model_list, &surf_network_model);
 939   lmm_set_default_protocol_function(func_reno_f, func_reno_fp,
 940                                     func_reno_fpi);
 941   network_solve = lagrange_solve;
 942
 943   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 944   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 945                             0.92);
 946   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 947 }
 948
 949
 950 void surf_network_model_init_Reno2(void)
 951 {
 952   if (surf_network_model)
 953     return;
 954
 955   surf_network_model_init_internal();
 956   net_define_callbacks();
 957
 958   xbt_dynar_push(model_list, &surf_network_model);
 959   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
 960                                     func_reno2_fpi);
 961   network_solve = lagrange_solve;
 962
 963   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 964   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 965                             0.92);
 966   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S_parameter",
 967                             8775);
 968 }
 969
 970 void surf_network_model_init_Vegas(void)
 971 {
 972   if (surf_network_model)
 973     return;
 974
 975   surf_network_model_init_internal();
 976   net_define_callbacks();
 977
 978   xbt_dynar_push(model_list, &surf_network_model);
 979   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
 980                                     func_vegas_fpi);
 981   network_solve = lagrange_solve;
 982
 983   xbt_cfg_setdefault_double(_sg_cfg_set, "network/latency_factor", 10.4);
 984   xbt_cfg_setdefault_double(_sg_cfg_set, "network/bandwidth_factor",
 985                             0.92);
 986   xbt_cfg_setdefault_double(_sg_cfg_set, "network/weight_S", 8775);
 987 }