src/surf/network.c

   1
   2 /*
   3  * Network with improved management of tasks, IM (Improved Management).
   4  * Uses a heap to store actions so that the share_resources is faster.
   5  * This model automatically sets the selective update flag to 1 and is
   6  * highly dependent on the maxmin lmm module.
   7  */
   8
   9 /* Copyright (c) 2009, 2010, 2011. The SimGrid Team.
  10  * All rights reserved.                                                     */
  11
  12 /* This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the license (GNU LGPL) which comes with this package. */
  14
  15 #include "network_private.h"
  16 #include "xbt/log.h"
  17 #include "xbt/str.h"
  18
  19 #include "surf_private.h"
  20 #include "xbt/dict.h"
  21 #include "maxmin_private.h"
  22 #include "surf/surfxml_parse_values.h"
  23 #include "surf/surf_resource.h"
  24 #include "surf/surf_resource_lmm.h"
  25
  26 #undef GENERIC_LMM_ACTION
  27 #undef GENERIC_ACTION
  28 #define GENERIC_LMM_ACTION(action) (action)->generic_lmm_action
  29 #define GENERIC_ACTION(action) GENERIC_LMM_ACTION(action).generic_action
  30
  31
  32 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_network, surf,
  33                                 "Logging specific to the SURF network module");
  34
  35 surf_model_t surf_network_model = NULL;
  36 static void (*network_solve) (lmm_system_t) = NULL;
  37
  38 xbt_dynar_t smpi_bw_factor = NULL;
  39 xbt_dynar_t smpi_lat_factor = NULL;
  40
  41 typedef struct s_smpi_factor *smpi_factor_t;
  42 typedef struct s_smpi_factor {
  43   long factor;
  44   double value;
  45 } s_smpi_factor_t;
  46
  47
  48 double sg_sender_gap = 0.0;
  49 double sg_latency_factor = 1.0; /* default value; can be set by model or from command line */
  50 double sg_bandwidth_factor = 1.0;       /* default value; can be set by model or from command line */
  51 double sg_weight_S_parameter = 0.0;     /* default value; can be set by model or from command line */
  52
  53 double sg_tcp_gamma = 0.0;
  54 int sg_network_crosstraffic = 0;
  55
  56 xbt_dict_t gap_lookup = NULL;
  57
  58 /******************************************************************************/
  59 /*                           Factors callbacks                                */
  60 /******************************************************************************/
  61 static double constant_latency_factor(double size)
  62 {
  63   return sg_latency_factor;
  64 }
  65
  66 static double constant_bandwidth_factor(double size)
  67 {
  68   return sg_bandwidth_factor;
  69 }
  70
  71 static double constant_bandwidth_constraint(double rate, double bound,
  72                                             double size)
  73 {
  74   return rate;
  75 }
  76
  77 /**********************/
  78 /*   SMPI callbacks   */
  79 /**********************/
  80 static xbt_dynar_t parse_factor(const char *smpi_coef_string)
  81 {
  82   char *value = NULL;
  83   unsigned int iter = 0;
  84   s_smpi_factor_t fact;
  85   xbt_dynar_t smpi_factor, radical_elements, radical_elements2 = NULL;
  86
  87   smpi_factor = xbt_dynar_new(sizeof(s_smpi_factor_t), NULL);
  88   radical_elements = xbt_str_split(smpi_coef_string, ";");
  89   xbt_dynar_foreach(radical_elements, iter, value) {
  90
  91     radical_elements2 = xbt_str_split(value, ":");
  92     if (xbt_dynar_length(radical_elements2) != 2)
  93       xbt_die("Malformed radical for smpi factor!");
  94     fact.factor = atol(xbt_dynar_get_as(radical_elements2, 0, char *));
  95     fact.value = atof(xbt_dynar_get_as(radical_elements2, 1, char *));
  96     xbt_dynar_push_as(smpi_factor, s_smpi_factor_t, fact);
  97     XBT_DEBUG("smpi_factor:\t%ld : %f", fact.factor, fact.value);
  98     xbt_dynar_free(&radical_elements2);
  99   }
 100   xbt_dynar_free(&radical_elements);
 101   return smpi_factor;
 102 }
 103
 104 static double smpi_bandwidth_factor(double size)
 105 {
 106   if (!smpi_bw_factor)
 107     smpi_bw_factor =
 108         parse_factor(xbt_cfg_get_string(_surf_cfg_set, "smpi/bw_factor"));
 109
 110   unsigned int iter = 0;
 111   s_smpi_factor_t fact;
 112   xbt_dynar_foreach(smpi_bw_factor, iter, fact) {
 113     if (size >= fact.factor) {
 114       XBT_DEBUG("%lf >= %ld return %f", size, fact.factor, fact.value);
 115       return fact.value;
 116     }
 117   }
 118
 119   return 1.0;
 120 }
 121
 122 static double smpi_latency_factor(double size)
 123 {
 124   if (!smpi_lat_factor)
 125     smpi_lat_factor =
 126         parse_factor(xbt_cfg_get_string(_surf_cfg_set, "smpi/lat_factor"));
 127
 128   unsigned int iter = 0;
 129   s_smpi_factor_t fact;
 130   xbt_dynar_foreach(smpi_lat_factor, iter, fact) {
 131     if (size >= fact.factor) {
 132       XBT_DEBUG("%lf >= %ld return %f", size, fact.factor, fact.value);
 133       return fact.value;
 134     }
 135   }
 136
 137   return 1.0;
 138 }
 139
 140 /**--------- <copy/paste C code snippet in surf/network.c> -----------*/
 141
 142 static double smpi_bandwidth_constraint(double rate, double bound,
 143                                         double size)
 144 {
 145   return rate < 0 ? bound : min(bound, rate * smpi_bandwidth_factor(size));
 146 }
 147
 148 static double (*latency_factor_callback) (double) =
 149     &constant_latency_factor;
 150 static double (*bandwidth_factor_callback) (double) =
 151     &constant_bandwidth_factor;
 152 static double (*bandwidth_constraint_callback) (double, double, double) =
 153     &constant_bandwidth_constraint;
 154
 155 static void (*gap_append) (double, const link_CM02_t,
 156                            surf_action_network_CM02_t) = NULL;
 157 static void (*gap_remove) (surf_action_network_CM02_t) = NULL;
 158
 159 static void *net_create_resource(const char *name,
 160                                  double bw_initial,
 161                                  tmgr_trace_t bw_trace,
 162                                  double lat_initial,
 163                                  tmgr_trace_t lat_trace,
 164                                  e_surf_resource_state_t
 165                                  state_initial,
 166                                  tmgr_trace_t state_trace,
 167                                  e_surf_link_sharing_policy_t
 168                                  policy, xbt_dict_t properties)
 169 {
 170   link_CM02_t nw_link = (link_CM02_t)
 171       surf_resource_lmm_new(sizeof(s_link_CM02_t),
 172                             surf_network_model, name, properties,
 173                             surf_network_model->model_private->maxmin_system,
 174                             sg_bandwidth_factor * bw_initial,
 175                             history,
 176                             state_initial, state_trace,
 177                             bw_initial, bw_trace);
 178
 179   xbt_assert(!xbt_lib_get_or_null(link_lib, name, SURF_LINK_LEVEL),
 180              "Link '%s' declared several times in the platform file.",
 181              name);
 182
 183   nw_link->lat_current = lat_initial;
 184   if (lat_trace)
 185     nw_link->lat_event =
 186         tmgr_history_add_trace(history, lat_trace, 0.0, 0, nw_link);
 187
 188   if (policy == SURF_LINK_FATPIPE)
 189     lmm_constraint_shared(nw_link->lmm_resource.constraint);
 190
 191   xbt_lib_set(link_lib, name, SURF_LINK_LEVEL, nw_link);
 192   XBT_DEBUG("Create link '%s'",name);
 193
 194   return nw_link;
 195 }
 196
 197 static void net_parse_link_init(sg_platf_link_cbarg_t link)
 198 {
 199   if (link->policy == SURF_LINK_FULLDUPLEX) {
 200     char *link_id;
 201     link_id = bprintf("%s_UP", link->id);
 202     net_create_resource(link_id,
 203                         link->bandwidth,
 204                         link->bandwidth_trace,
 205                         link->latency,
 206                         link->latency_trace,
 207                         link->state,
 208                         link->state_trace, link->policy, link->properties);
 209     xbt_free(link_id);
 210     link_id = bprintf("%s_DOWN", link->id);
 211     net_create_resource(link_id,
 212                         link->bandwidth,
 213                         link->bandwidth_trace,
 214                         link->latency,
 215                         link->latency_trace,
 216                         link->state,
 217                         link->state_trace, link->policy, link->properties);
 218     xbt_free(link_id);
 219   } else {
 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   }
 228 }
 229
 230 static void net_add_traces(void)
 231 {
 232   xbt_dict_cursor_t cursor = NULL;
 233   char *trace_name, *elm;
 234
 235   static int called = 0;
 236   if (called)
 237     return;
 238   called = 1;
 239
 240   /* connect all traces relative to network */
 241   xbt_dict_foreach(trace_connect_list_link_avail, cursor, trace_name, elm) {
 242     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 243     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 244
 245     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 246                trace_name, elm);
 247     xbt_assert(trace,
 248                "Cannot connect trace %s to link %s: trace undefined",
 249                trace_name, elm);
 250
 251     link->lmm_resource.state_event =
 252         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 253   }
 254
 255   xbt_dict_foreach(trace_connect_list_bandwidth, cursor, trace_name, elm) {
 256     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 257     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 258
 259     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 260                trace_name, elm);
 261     xbt_assert(trace,
 262                "Cannot connect trace %s to link %s: trace undefined",
 263                trace_name, elm);
 264
 265     link->lmm_resource.power.event =
 266         tmgr_history_add_trace(history, trace, 0.0, 0, link);
 267   }
 268
 269   xbt_dict_foreach(trace_connect_list_latency, cursor, trace_name, elm) {
 270     tmgr_trace_t trace = xbt_dict_get_or_null(traces_set_list, trace_name);
 271     link_CM02_t link = xbt_lib_get_or_null(link_lib, elm, SURF_LINK_LEVEL);
 272
 273     xbt_assert(link, "Cannot connect trace %s to link %s: link undefined",
 274                trace_name, elm);
 275     xbt_assert(trace,
 276                "Cannot connect trace %s to link %s: trace undefined",
 277                trace_name, elm);
 278
 279     link->lat_event = tmgr_history_add_trace(history, trace, 0.0, 0, link);
 280   }
 281 }
 282
 283 static void net_define_callbacks(void)
 284 {
 285   /* Figuring out the network links */
 286   sg_platf_link_add_cb(net_parse_link_init);
 287   sg_platf_postparse_add_cb(net_add_traces);
 288 }
 289
 290 static int net_resource_used(void *resource_id)
 291 {
 292   return lmm_constraint_used(surf_network_model->model_private->maxmin_system, ((surf_resource_lmm_t)
 293                                                      resource_id)->
 294                              constraint);
 295 }
 296
 297 void net_action_recycle(surf_action_t action)
 298 {
 299   return;
 300 }
 301
 302 #ifdef HAVE_LATENCY_BOUND_TRACKING
 303 int net_get_link_latency_limited(surf_action_t action)
 304 {
 305   return action->latency_limited;
 306 }
 307 #endif
 308
 309 static double net_share_resources_full(double now)
 310 {
 311   s_surf_action_lmm_t s_action;
 312   surf_action_network_CM02_t action = NULL;
 313   xbt_swag_t running_actions =
 314       surf_network_model->states.running_action_set;
 315   double min;
 316
 317   min = generic_maxmin_share_resources(running_actions,
 318                                        xbt_swag_offset(s_action,
 319                                                        variable),
 320                                                        surf_network_model->model_private->maxmin_system,
 321                                        network_solve);
 322
 323 #define VARIABLE(action) (*((lmm_variable_t*)(((char *) (action)) + xbt_swag_offset(s_action, variable)  )))
 324
 325   xbt_swag_foreach(action, running_actions) {
 326 #ifdef HAVE_LATENCY_BOUND_TRACKING
 327     if (lmm_is_variable_limited_by_latency(GENERIC_LMM_ACTION(action).variable)) {
 328       action->latency_limited = 1;
 329     } else {
 330       action->latency_limited = 0;
 331     }
 332 #endif
 333     if (action->latency > 0) {
 334       min = (min < 0) ? action->latency : min(min, action->latency);
 335     }
 336   }
 337
 338   XBT_DEBUG("Min of share resources %f", min);
 339
 340   return min;
 341 }
 342
 343 static double net_share_resources_lazy(double now)
 344 {
 345   return generic_share_resources_lazy(now, surf_network_model);
 346 }
 347
 348 static void net_update_actions_state_full(double now, double delta)
 349 {
 350   double deltap = 0.0;
 351   surf_action_network_CM02_t action = NULL;
 352   surf_action_network_CM02_t next_action = NULL;
 353   xbt_swag_t running_actions =
 354       surf_network_model->states.running_action_set;
 355   /*
 356      xbt_swag_t failed_actions =
 357      surf_network_model->states.failed_action_set;
 358    */
 359
 360   xbt_swag_foreach_safe(action, next_action, running_actions) {
 361     deltap = delta;
 362     if (action->latency > 0) {
 363       if (action->latency > deltap) {
 364         double_update(&(action->latency), deltap);
 365         deltap = 0.0;
 366       } else {
 367         double_update(&(deltap), action->latency);
 368         action->latency = 0.0;
 369       }
 370       if ((action->latency == 0.0) && !(GENERIC_LMM_ACTION(action).suspended))
 371         lmm_update_variable_weight(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 372                                    action->weight);
 373     }
 374 #ifdef HAVE_TRACING
 375     if (TRACE_is_enabled()) {
 376       int n = lmm_get_number_of_cnst_from_var(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable);
 377       unsigned int i;
 378       for (i = 0; i < n; i++){
 379         lmm_constraint_t constraint = lmm_get_cnst_from_var(surf_network_model->model_private->maxmin_system,
 380                                                             GENERIC_LMM_ACTION(action).variable,
 381                                                             i);
 382         link_CM02_t link = lmm_constraint_id(constraint);
 383         TRACE_surf_link_set_utilization(link->lmm_resource.generic_resource.name,
 384                                         ((surf_action_t)action)->category,
 385                                         (lmm_variable_getvalue(GENERIC_LMM_ACTION(action).variable)*
 386                                         lmm_get_cnst_weight_from_var(surf_network_model->model_private->maxmin_system,
 387                                             GENERIC_LMM_ACTION(action).variable,
 388                                             i)),
 389                                         now - delta,
 390                                         delta);
 391       }
 392     }
 393 #endif
 394     if (!lmm_get_number_of_cnst_from_var
 395         (surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable)) {
 396       /* There is actually no link used, hence an infinite bandwidth.
 397        * This happens often when using models like vivaldi.
 398        * In such case, just make sure that the action completes immediately.
 399        */
 400       double_update(&(GENERIC_ACTION(action).remains),
 401                     GENERIC_ACTION(action).remains);
 402     }
 403     double_update(&(GENERIC_ACTION(action).remains),
 404                   lmm_variable_getvalue(GENERIC_LMM_ACTION(action).variable) * deltap);
 405     if (((surf_action_t)action)->max_duration != NO_MAX_DURATION)
 406       double_update(&(((surf_action_t)action)->max_duration), delta);
 407
 408     if ((GENERIC_ACTION(action).remains <= 0) &&
 409         (lmm_get_variable_weight(GENERIC_LMM_ACTION(action).variable) > 0)) {
 410       ((surf_action_t)action)->finish = surf_get_clock();
 411       surf_network_model->action_state_set((surf_action_t) action,
 412                                            SURF_ACTION_DONE);
 413
 414       if (gap_remove)
 415         gap_remove(action);
 416     } else if ((((surf_action_t)action)->max_duration != NO_MAX_DURATION)
 417                && (((surf_action_t)action)->max_duration <= 0)) {
 418       ((surf_action_t)action)->finish = surf_get_clock();
 419       surf_network_model->action_state_set((surf_action_t) action,
 420                                            SURF_ACTION_DONE);
 421       if (gap_remove)
 422         gap_remove(action);
 423     }
 424   }
 425
 426   return;
 427 }
 428
 429 static void net_update_actions_state_lazy(double now, double delta)
 430 {
 431   generic_update_actions_state_lazy(now, delta, surf_network_model);
 432 }
 433
 434 static void net_update_resource_state(void *id,
 435                                       tmgr_trace_event_t event_type,
 436                                       double value, double date)
 437 {
 438   link_CM02_t nw_link = id;
 439   /*   printf("[" "%lg" "] Asking to update network card \"%s\" with value " */
 440   /*     "%lg" " for event %p\n", surf_get_clock(), nw_link->name, */
 441   /*     value, event_type); */
 442
 443   if (event_type == nw_link->lmm_resource.power.event) {
 444     double delta =
 445         sg_weight_S_parameter / value - sg_weight_S_parameter /
 446         (nw_link->lmm_resource.power.peak *
 447          nw_link->lmm_resource.power.scale);
 448     lmm_variable_t var = NULL;
 449     lmm_element_t elem = NULL;
 450     surf_action_network_CM02_t action = NULL;
 451
 452     nw_link->lmm_resource.power.peak = value;
 453     lmm_update_constraint_bound(surf_network_model->model_private->maxmin_system,
 454                                 nw_link->lmm_resource.constraint,
 455                                 sg_bandwidth_factor *
 456                                 (nw_link->lmm_resource.power.peak *
 457                                  nw_link->lmm_resource.power.scale));
 458 #ifdef HAVE_TRACING
 459     TRACE_surf_link_set_bandwidth(date,
 460                                   (char
 461                                    *) (((nw_link->lmm_resource).
 462                                         generic_resource).name),
 463                                   sg_bandwidth_factor *
 464                                   (nw_link->lmm_resource.power.peak *
 465                                    nw_link->lmm_resource.power.scale));
 466 #endif
 467     if (sg_weight_S_parameter > 0) {
 468       while ((var = lmm_get_var_from_cnst
 469               (surf_network_model->model_private->maxmin_system, nw_link->lmm_resource.constraint,
 470                &elem))) {
 471         action = lmm_variable_id(var);
 472         action->weight += delta;
 473         if (!(GENERIC_LMM_ACTION(action).suspended))
 474           lmm_update_variable_weight(surf_network_model->model_private->maxmin_system,
 475                                      GENERIC_LMM_ACTION(action).variable, action->weight);
 476       }
 477     }
 478     if (tmgr_trace_event_free(event_type))
 479       nw_link->lmm_resource.power.event = NULL;
 480   } else if (event_type == nw_link->lat_event) {
 481     double delta = value - nw_link->lat_current;
 482     lmm_variable_t var = NULL;
 483     lmm_element_t elem = NULL;
 484     surf_action_network_CM02_t action = NULL;
 485
 486     nw_link->lat_current = value;
 487     while ((var = lmm_get_var_from_cnst
 488             (surf_network_model->model_private->maxmin_system, nw_link->lmm_resource.constraint,
 489              &elem))) {
 490       action = lmm_variable_id(var);
 491       action->lat_current += delta;
 492       action->weight += delta;
 493       if (action->rate < 0)
 494         lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 495                                   sg_tcp_gamma / (2.0 *
 496                                                   action->lat_current));
 497       else {
 498         lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 499                                   min(action->rate,
 500                                       sg_tcp_gamma / (2.0 *
 501                                                       action->
 502                                                       lat_current)));
 503
 504         if (action->rate < sg_tcp_gamma / (2.0 * action->lat_current)) {
 505           XBT_INFO("Flow is limited BYBANDWIDTH");
 506         } else {
 507           XBT_INFO("Flow is limited BYLATENCY, latency of flow is %f",
 508                    action->lat_current);
 509         }
 510       }
 511       if (!(GENERIC_LMM_ACTION(action).suspended))
 512         lmm_update_variable_weight(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 513                                    action->weight);
 514
 515     }
 516     if (tmgr_trace_event_free(event_type))
 517       nw_link->lat_event = NULL;
 518   } else if (event_type == nw_link->lmm_resource.state_event) {
 519     if (value > 0)
 520       nw_link->lmm_resource.state_current = SURF_RESOURCE_ON;
 521     else {
 522       lmm_constraint_t cnst = nw_link->lmm_resource.constraint;
 523       lmm_variable_t var = NULL;
 524       lmm_element_t elem = NULL;
 525
 526       nw_link->lmm_resource.state_current = SURF_RESOURCE_OFF;
 527       while ((var = lmm_get_var_from_cnst
 528               (surf_network_model->model_private->maxmin_system, cnst, &elem))) {
 529         surf_action_t action = lmm_variable_id(var);
 530
 531         if (surf_action_state_get(action) == SURF_ACTION_RUNNING ||
 532             surf_action_state_get(action) == SURF_ACTION_READY) {
 533           action->finish = date;
 534           surf_network_model->action_state_set(action, SURF_ACTION_FAILED);
 535         }
 536       }
 537     }
 538     if (tmgr_trace_event_free(event_type))
 539       nw_link->lmm_resource.state_event = NULL;
 540   } else {
 541     XBT_CRITICAL("Unknown event ! \n");
 542     xbt_abort();
 543   }
 544
 545   XBT_DEBUG
 546       ("There were a resource state event, need to update actions related to the constraint (%p)",
 547        nw_link->lmm_resource.constraint);
 548   return;
 549 }
 550
 551
 552 static surf_action_t net_communicate(sg_routing_edge_t src,
 553                                      sg_routing_edge_t dst,
 554                                      double size, double rate)
 555 {
 556   unsigned int i;
 557   link_CM02_t link;
 558   int failed = 0;
 559   surf_action_network_CM02_t action = NULL;
 560   double bandwidth_bound;
 561   double latency = 0.0;
 562   xbt_dynar_t back_route = NULL;
 563   int constraints_per_variable = 0;
 564
 565   xbt_dynar_t route = xbt_dynar_new(sizeof(sg_routing_link_t), NULL);
 566
 567   XBT_IN("(%s,%s,%g,%g)", src->name, dst->name, size, rate);
 568
 569   routing_get_route_and_latency(src, dst, &route, &latency);
 570   xbt_assert(!xbt_dynar_is_empty(route) || latency,
 571              "You're trying to send data from %s to %s but there is no connection at all between these two hosts.",
 572              src->name, dst->name);
 573
 574   xbt_dynar_foreach(route, i, link) {
 575     if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 576       failed = 1;
 577       break;
 578     }
 579   }
 580   if (sg_network_crosstraffic == 1) {
 581     routing_get_route_and_latency(dst, src, &back_route, NULL);
 582     xbt_dynar_foreach(back_route, i, link) {
 583       if (link->lmm_resource.state_current == SURF_RESOURCE_OFF) {
 584         failed = 1;
 585         break;
 586       }
 587     }
 588   }
 589
 590   action =
 591       surf_action_new(sizeof(s_surf_action_network_CM02_t), size,
 592                       surf_network_model, failed);
 593 #ifdef HAVE_LATENCY_BOUND_TRACKING
 594   action->latency_limited = 0;
 595 #endif
 596   action->weight = action->latency = latency;
 597
 598   xbt_swag_insert(action, ((surf_action_t)action)->state_set);
 599   action->rate = rate;
 600   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 601     GENERIC_LMM_ACTION(action).index_heap = -1;
 602     GENERIC_LMM_ACTION(action).last_update = surf_get_clock();
 603   }
 604
 605   bandwidth_bound = -1.0;
 606   if (sg_weight_S_parameter > 0) {
 607     xbt_dynar_foreach(route, i, link) {
 608       action->weight +=
 609           sg_weight_S_parameter /
 610           (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 611     }
 612   }
 613   xbt_dynar_foreach(route, i, link) {
 614     double bb = bandwidth_factor_callback(size) *
 615         (link->lmm_resource.power.peak * link->lmm_resource.power.scale);
 616     bandwidth_bound =
 617         (bandwidth_bound < 0.0) ? bb : min(bandwidth_bound, bb);
 618   }
 619
 620   action->lat_current = action->latency;
 621   action->latency *= latency_factor_callback(size);
 622   action->rate =
 623       bandwidth_constraint_callback(action->rate, bandwidth_bound, size);
 624   if (gap_append) {
 625     xbt_assert(!xbt_dynar_is_empty(route),
 626                "Using a model with a gap (e.g., SMPI) with a platform without links (e.g. vivaldi)!!!");
 627
 628     link = *(link_CM02_t *) xbt_dynar_get_ptr(route, 0);
 629     gap_append(size, link, action);
 630     XBT_DEBUG("Comm %p: %s -> %s gap=%f (lat=%f)",
 631               action, src->name, dst->name, action->sender.gap,
 632               action->latency);
 633   }
 634
 635   constraints_per_variable = xbt_dynar_length(route);
 636   if (back_route != NULL)
 637     constraints_per_variable += xbt_dynar_length(back_route);
 638
 639   if (action->latency > 0) {
 640     GENERIC_LMM_ACTION(action).variable =
 641         lmm_variable_new(surf_network_model->model_private->maxmin_system, action, 0.0, -1.0,
 642                          constraints_per_variable);
 643     if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 644       // add to the heap the event when the latency is payed
 645       XBT_DEBUG("Added action (%p) one latency event at date %f", action,
 646                 action->latency + GENERIC_LMM_ACTION(action).last_update);
 647       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,
 648                   xbt_dynar_is_empty(route) ? NORMAL : LATENCY);
 649     }
 650   } else
 651     GENERIC_LMM_ACTION(action).variable =
 652         lmm_variable_new(surf_network_model->model_private->maxmin_system, action, 1.0, -1.0,
 653                          constraints_per_variable);
 654
 655   if (action->rate < 0) {
 656     lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 657                               (action->lat_current > 0) ?
 658                               sg_tcp_gamma / (2.0 *
 659                                               action->lat_current) : -1.0);
 660   } else {
 661     lmm_update_variable_bound(surf_network_model->model_private->maxmin_system, GENERIC_LMM_ACTION(action).variable,
 662                               (action->lat_current > 0) ?
 663                               min(action->rate,
 664                                   sg_tcp_gamma / (2.0 *
 665                                                   action->lat_current))
 666                               : action->rate);
 667   }
 668
 669   xbt_dynar_foreach(route, i, link) {
 670     lmm_expand(surf_network_model->model_private->maxmin_system, link->lmm_resource.constraint,
 671                GENERIC_LMM_ACTION(action).variable, 1.0);
 672   }
 673
 674   if (sg_network_crosstraffic == 1) {
 675     XBT_DEBUG("Fullduplex active adding backward flow using 5%%");
 676     xbt_dynar_foreach(back_route, i, link) {
 677       lmm_expand(surf_network_model->model_private->maxmin_system, link->lmm_resource.constraint,
 678                  GENERIC_LMM_ACTION(action).variable, .05);
 679     }
 680   }
 681
 682   xbt_dynar_free(&route);
 683   XBT_OUT();
 684
 685   return (surf_action_t) action;
 686 }
 687
 688 static xbt_dynar_t net_get_route(void *src, void *dst)
 689 {
 690   xbt_dynar_t route = NULL;
 691   routing_get_route_and_latency(src, dst, &route, NULL);
 692   return route;
 693 }
 694
 695 static double net_get_link_bandwidth(const void *link)
 696 {
 697   surf_resource_lmm_t lmm = (surf_resource_lmm_t) link;
 698   return lmm->power.peak * lmm->power.scale;
 699 }
 700
 701 static double net_get_link_latency(const void *link)
 702 {
 703   return ((link_CM02_t) link)->lat_current;
 704 }
 705
 706 static int net_link_shared(const void *link)
 707 {
 708   return
 709       lmm_constraint_is_shared(((surf_resource_lmm_t) link)->constraint);
 710 }
 711
 712 static void net_finalize(void)
 713 {
 714   lmm_system_free(surf_network_model->model_private->maxmin_system);
 715   surf_network_model->model_private->maxmin_system = NULL;
 716
 717   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 718     xbt_heap_free(surf_network_model->model_private->action_heap);
 719     xbt_swag_free(surf_network_model->model_private->modified_set);
 720   }
 721
 722   surf_model_exit(surf_network_model);
 723   surf_network_model = NULL;
 724
 725   if (smpi_bw_factor)
 726     xbt_dynar_free(&smpi_bw_factor);
 727   if (smpi_lat_factor)
 728     xbt_dynar_free(&smpi_lat_factor);
 729 }
 730
 731 static void smpi_gap_append(double size, const link_CM02_t link,
 732                             surf_action_network_CM02_t action)
 733 {
 734   const char *src = link->lmm_resource.generic_resource.name;
 735   xbt_fifo_t fifo;
 736   surf_action_network_CM02_t last_action;
 737   double bw;
 738
 739   if (sg_sender_gap > 0.0) {
 740     if (!gap_lookup) {
 741       gap_lookup = xbt_dict_new();
 742     }
 743     fifo = (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup, src);
 744     action->sender.gap = 0.0;
 745     if (fifo && xbt_fifo_size(fifo) > 0) {
 746       /* Compute gap from last send */
 747       last_action =
 748           (surf_action_network_CM02_t)
 749           xbt_fifo_get_item_content(xbt_fifo_get_last_item(fifo));
 750       bw = net_get_link_bandwidth(link);
 751       action->sender.gap =
 752           last_action->sender.gap + max(sg_sender_gap,
 753                                         last_action->sender.size / bw);
 754       action->latency += action->sender.gap;
 755     }
 756     /* Append action as last send */
 757     action->sender.link_name = link->lmm_resource.generic_resource.name;
 758     fifo =
 759         (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup,
 760                                           action->sender.link_name);
 761     if (!fifo) {
 762       fifo = xbt_fifo_new();
 763       xbt_dict_set(gap_lookup, action->sender.link_name, fifo, NULL);
 764     }
 765     action->sender.fifo_item = xbt_fifo_push(fifo, action);
 766     action->sender.size = size;
 767   }
 768 }
 769
 770 static void smpi_gap_remove(surf_action_network_CM02_t action)
 771 {
 772   xbt_fifo_t fifo;
 773   size_t size;
 774
 775   if (sg_sender_gap > 0.0 && action->sender.link_name
 776       && action->sender.fifo_item) {
 777     fifo =
 778         (xbt_fifo_t) xbt_dict_get_or_null(gap_lookup,
 779                                           action->sender.link_name);
 780     xbt_fifo_remove_item(fifo, action->sender.fifo_item);
 781     size = xbt_fifo_size(fifo);
 782     if (size == 0) {
 783       xbt_fifo_free(fifo);
 784       xbt_dict_remove(gap_lookup, action->sender.link_name);
 785       size = xbt_dict_length(gap_lookup);
 786       if (size == 0) {
 787         xbt_dict_free(&gap_lookup);
 788       }
 789     }
 790   }
 791 }
 792
 793 static void set_update_mechanism(void)
 794 {
 795   char *optim = xbt_cfg_get_string(_surf_cfg_set, "network/optim");
 796   int select =
 797       xbt_cfg_get_int(_surf_cfg_set, "network/maxmin_selective_update");
 798
 799   if (!strcmp(optim, "Full")) {
 800     surf_network_model->model_private->update_mechanism = UM_FULL;
 801     surf_network_model->model_private->selective_update = select;
 802   } else if (!strcmp(optim, "Lazy")) {
 803     surf_network_model->model_private->update_mechanism = UM_LAZY;
 804     surf_network_model->model_private->selective_update = 1;
 805     xbt_assert((select == 1)
 806                ||
 807                (xbt_cfg_is_default_value
 808                 (_surf_cfg_set, "network/maxmin_selective_update")),
 809                "Disabling selective update while using the lazy update mechanism is dumb!");
 810   } else {
 811     xbt_die("Unsupported optimization (%s) for this model", optim);
 812   }
 813 }
 814
 815 static void surf_network_model_init_internal(void)
 816 {
 817   s_surf_action_network_CM02_t comm;
 818   surf_network_model = surf_model_init();
 819
 820   set_update_mechanism();
 821
 822   surf_network_model->name = "network";
 823   surf_network_model->action_unref = surf_action_unref;
 824   surf_network_model->action_cancel = surf_action_cancel;
 825   surf_network_model->action_recycle = net_action_recycle;
 826
 827   surf_network_model->get_remains = surf_action_get_remains;
 828
 829 #ifdef HAVE_LATENCY_BOUND_TRACKING
 830   surf_network_model->get_latency_limited = net_get_link_latency_limited;
 831 #endif
 832 #ifdef HAVE_TRACING
 833   surf_network_model->set_category = surf_action_set_category;
 834 #endif
 835
 836   surf_network_model->model_private->resource_used = net_resource_used;
 837   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 838     surf_network_model->model_private->share_resources =
 839         net_share_resources_lazy;
 840     surf_network_model->model_private->update_actions_state =
 841         net_update_actions_state_lazy;
 842   } else if (surf_network_model->model_private->update_mechanism == UM_FULL) {
 843     surf_network_model->model_private->share_resources =
 844         net_share_resources_full;
 845     surf_network_model->model_private->update_actions_state =
 846         net_update_actions_state_full;
 847   }
 848
 849   surf_network_model->model_private->update_resource_state =
 850       net_update_resource_state;
 851   surf_network_model->model_private->finalize = net_finalize;
 852
 853   surf_network_model->suspend = surf_action_suspend;
 854   surf_network_model->resume = surf_action_resume;
 855   surf_network_model->is_suspended = surf_action_is_suspended;
 856   surf_cpu_model->set_max_duration = surf_action_set_max_duration;
 857
 858   surf_network_model->extension.network.communicate = net_communicate;
 859   surf_network_model->extension.network.get_route = net_get_route;
 860   surf_network_model->extension.network.get_link_bandwidth =
 861       net_get_link_bandwidth;
 862   surf_network_model->extension.network.get_link_latency =
 863       net_get_link_latency;
 864   surf_network_model->extension.network.link_shared = net_link_shared;
 865   surf_network_model->extension.network.add_traces = net_add_traces;
 866   surf_network_model->extension.network.create_resource =
 867       net_create_resource;
 868
 869   if (!surf_network_model->model_private->maxmin_system)
 870     surf_network_model->model_private->maxmin_system = lmm_system_new(surf_network_model->model_private->selective_update);
 871
 872   routing_model_create(net_create_resource("__loopback__",
 873                                            498000000, NULL, 0.000015, NULL,
 874                                            SURF_RESOURCE_ON, NULL,
 875                                            SURF_LINK_FATPIPE, NULL));
 876
 877   if (surf_network_model->model_private->update_mechanism == UM_LAZY) {
 878     surf_network_model->model_private->action_heap = xbt_heap_new(8, NULL);
 879     xbt_heap_set_update_callback(surf_network_model->model_private->action_heap,
 880                                  surf_action_lmm_update_index_heap);
 881     surf_network_model->model_private->modified_set =
 882         xbt_swag_new(xbt_swag_offset(comm, generic_lmm_action.action_list_hookup));
 883     surf_network_model->model_private->maxmin_system->keep_track = surf_network_model->model_private->modified_set;
 884   }
 885 }
 886
 887 /************************************************************************/
 888 /* New model based on LV08 and experimental results of MPI ping-pongs   */
 889 /************************************************************************/
 890 /* @Inproceedings{smpi_ipdps, */
 891 /*  author={Pierre-Nicolas Clauss and Mark Stillwell and Stéphane Genaud and Frédéric Suter and Henri Casanova and Martin Quinson}, */
 892 /*  title={Single Node On-Line Simulation of {MPI} Applications with SMPI}, */
 893 /*  booktitle={25th IEEE International Parallel and Distributed Processing Symposium (IPDPS'11)}, */
 894 /*  address={Anchorage (Alaska) USA}, */
 895 /*  month=may, */
 896 /*  year={2011} */
 897 /*  } */
 898 void surf_network_model_init_SMPI(void)
 899 {
 900
 901   if (surf_network_model)
 902     return;
 903
 904   surf_network_model_init_internal();
 905   latency_factor_callback = &smpi_latency_factor;
 906   bandwidth_factor_callback = &smpi_bandwidth_factor;
 907   bandwidth_constraint_callback = &smpi_bandwidth_constraint;
 908   gap_append = &smpi_gap_append;
 909   gap_remove = &smpi_gap_remove;
 910   net_define_callbacks();
 911   xbt_dynar_push(model_list, &surf_network_model);
 912   network_solve = lmm_solve;
 913
 914   xbt_cfg_setdefault_double(_surf_cfg_set, "network/sender_gap", 10e-6);
 915   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
 916 }
 917
 918 /************************************************************************/
 919 /* New model based on optimizations discussed during Pedro Velho's thesis*/
 920 /************************************************************************/
 921 /* @techreport{VELHO:2011:HAL-00646896:1, */
 922 /*      url = {http://hal.inria.fr/hal-00646896/en/}, */
 923 /*      title = {{Flow-level network models: have we reached the limits?}}, */
 924 /*      author = {Velho, Pedro and Schnorr, Lucas and Casanova, Henri and Legrand, Arnaud}, */
 925 /*      type = {Rapport de recherche}, */
 926 /*      institution = {INRIA}, */
 927 /*      number = {RR-7821}, */
 928 /*      year = {2011}, */
 929 /*      month = Nov, */
 930 /*      pdf = {http://hal.inria.fr/hal-00646896/PDF/rr-validity.pdf}, */
 931 /*  } */
 932 void surf_network_model_init_LegrandVelho(void)
 933 {
 934   if (surf_network_model)
 935     return;
 936
 937   surf_network_model_init_internal();
 938   net_define_callbacks();
 939   xbt_dynar_push(model_list, &surf_network_model);
 940   network_solve = lmm_solve;
 941
 942   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor",
 943                             13.01);
 944   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 945                             0.97);
 946   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 20537);
 947 }
 948
 949 /***************************************************************************/
 950 /* The nice TCP sharing model designed by Loris Marchal and Henri Casanova */
 951 /***************************************************************************/
 952 /* @TechReport{      rr-lip2002-40, */
 953 /*   author        = {Henri Casanova and Loris Marchal}, */
 954 /*   institution   = {LIP}, */
 955 /*   title         = {A Network Model for Simulation of Grid Application}, */
 956 /*   number        = {2002-40}, */
 957 /*   month         = {oct}, */
 958 /*   year          = {2002} */
 959 /* } */
 960 void surf_network_model_init_CM02(void)
 961 {
 962
 963   if (surf_network_model)
 964     return;
 965
 966   surf_network_model_init_internal();
 967   net_define_callbacks();
 968   xbt_dynar_push(model_list, &surf_network_model);
 969   network_solve = lmm_solve;
 970
 971   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 1.0);
 972   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
 973                             1.0);
 974   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 0.0);
 975 }
 976
 977 /***************************************************************************/
 978 /* The models from Steven H. Low                                           */
 979 /***************************************************************************/
 980 /* @article{Low03,                                                         */
 981 /*   author={Steven H. Low},                                               */
 982 /*   title={A Duality Model of {TCP} and Queue Management Algorithms},     */
 983 /*   year={2003},                                                          */
 984 /*   journal={{IEEE/ACM} Transactions on Networking},                      */
 985 /*    volume={11}, number={4},                                             */
 986 /*  }                                                                      */
 987 void surf_network_model_init_Reno(void)
 988 {
 989   if (surf_network_model)
 990     return;
 991
 992   surf_network_model_init_internal();
 993   net_define_callbacks();
 994
 995   xbt_dynar_push(model_list, &surf_network_model);
 996   lmm_set_default_protocol_function(func_reno_f, func_reno_fp,
 997                                     func_reno_fpi);
 998   network_solve = lagrange_solve;
 999
1000   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
1001   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
1002                             0.92);
1003   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
1004 }
1005
1006
1007 void surf_network_model_init_Reno2(void)
1008 {
1009   if (surf_network_model)
1010     return;
1011
1012   surf_network_model_init_internal();
1013   net_define_callbacks();
1014
1015   xbt_dynar_push(model_list, &surf_network_model);
1016   lmm_set_default_protocol_function(func_reno2_f, func_reno2_fp,
1017                                     func_reno2_fpi);
1018   network_solve = lagrange_solve;
1019
1020   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
1021   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
1022                             0.92);
1023   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S_parameter",
1024                             8775);
1025 }
1026
1027 void surf_network_model_init_Vegas(void)
1028 {
1029   if (surf_network_model)
1030     return;
1031
1032   surf_network_model_init_internal();
1033   net_define_callbacks();
1034
1035   xbt_dynar_push(model_list, &surf_network_model);
1036   lmm_set_default_protocol_function(func_vegas_f, func_vegas_fp,
1037                                     func_vegas_fpi);
1038   network_solve = lagrange_solve;
1039
1040   xbt_cfg_setdefault_double(_surf_cfg_set, "network/latency_factor", 10.4);
1041   xbt_cfg_setdefault_double(_surf_cfg_set, "network/bandwidth_factor",
1042                             0.92);
1043   xbt_cfg_setdefault_double(_surf_cfg_set, "network/weight_S", 8775);
1044 }