examples/msg/actions/actions.c

   1 /* Copyright (c) 2009, 2010. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include "msg/msg.h"            /* Yeah! If you want to use msg, you need to include msg/msg.h */
  10 #include "simix/simix.h"        /* semaphores for the barrier */
  11 #include "xbt.h"                /* calloc, printf */
  12 #include "simgrid_config.h"     /* getline */
  13 #include "instr/instr_private.h"
  14
  15 XBT_LOG_NEW_DEFAULT_CATEGORY(actions,
  16                              "Messages specific for this msg example");
  17 int communicator_size = 0;
  18
  19 static void action_Isend(xbt_dynar_t action);
  20
  21 typedef struct  {
  22   int last_Irecv_sender_id;
  23   int bcast_counter;
  24   int reduce_counter;
  25   int allReduce_counter;
  26   xbt_dynar_t isends;
  27 } s_process_globals_t, *process_globals_t;
  28
  29 /* Helper function */
  30 static double parse_double(const char *string)
  31 {
  32   double value;
  33   char *endptr;
  34
  35   value = strtod(string, &endptr);
  36   if (*endptr != '\0')
  37     THROW1(unknown_error, 0, "%s is not a double", string);
  38   return value;
  39 }
  40
  41 static int get_rank (const char *process_name)
  42 {
  43   return atoi(&(process_name[1]));
  44 }
  45
  46 static void asynchronous_cleanup(void) {
  47   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
  48
  49   /* Destroy any isend which correspond to completed communications */
  50   int found;
  51   msg_comm_t comm;
  52   while ((found = MSG_comm_testany(globals->isends)) != -1) {
  53     xbt_dynar_remove_at(globals->isends,found,&comm);
  54     MSG_comm_destroy(comm);
  55   }
  56 }
  57
  58 /* My actions */
  59 static int spawned_send(int argc, char *argv[])
  60 {
  61   DEBUG3("%s: Sending %s on %s", MSG_process_get_name(MSG_process_self()),
  62          argv[1], argv[0]);
  63   MSG_task_send(MSG_task_create(argv[0], 0, parse_double(argv[1]), NULL),
  64                 argv[0]);
  65   return 0;
  66 }
  67
  68 static void action_send(xbt_dynar_t action)
  69 {
  70   char *name = NULL;
  71   char to[250];
  72   char *size_str = xbt_dynar_get_as(action, 3, char *);
  73   double size=parse_double(size_str);
  74   double clock = MSG_get_clock(); /* this "call" is free thanks to inlining */
  75
  76   sprintf(to, "%s_%s", MSG_process_get_name(MSG_process_self()),
  77           xbt_dynar_get_as(action, 2, char *));
  78   //  char *to =  xbt_dynar_get_as(action, 2, char *);
  79
  80   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
  81     name = xbt_str_join(action, " ");
  82
  83 #ifdef HAVE_TRACING
  84   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
  85   int dst_traced = get_rank(xbt_dynar_get_as(action, 2, char *));
  86   TRACE_smpi_ptp_in(rank, rank, dst_traced, "send");
  87   TRACE_smpi_send(rank, rank, dst_traced);
  88 #endif
  89
  90   DEBUG2("Entering Send: %s (size: %lg)", name, size);
  91    if (size<65536) {
  92      action_Isend(action);
  93    } else {
  94      MSG_task_send(MSG_task_create(name, 0, size, NULL), to);
  95    }
  96
  97    VERB2("%s %f", name, MSG_get_clock() - clock);
  98
  99   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 100     free(name);
 101
 102 #ifdef HAVE_TRACING
 103   TRACE_smpi_ptp_out(rank, rank, dst_traced, "send");
 104 #endif
 105
 106   asynchronous_cleanup();
 107 }
 108
 109 static void action_Isend(xbt_dynar_t action)
 110 {
 111   char to[250];
 112   //  char *to = xbt_dynar_get_as(action, 2, char *);
 113   char *size = xbt_dynar_get_as(action, 3, char *);
 114   double clock = MSG_get_clock();
 115   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
 116
 117
 118   sprintf(to, "%s_%s", MSG_process_get_name(MSG_process_self()),
 119           xbt_dynar_get_as(action, 2, char *));
 120
 121   msg_comm_t comm =
 122       MSG_task_isend( MSG_task_create(to,0,parse_double(size),NULL), to);
 123   xbt_dynar_push(globals->isends,&comm);
 124
 125   DEBUG1("Isend on %s", MSG_process_get_name(MSG_process_self()));
 126   VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 127
 128   asynchronous_cleanup();
 129 }
 130
 131
 132 static void action_recv(xbt_dynar_t action)
 133 {
 134   char *name = NULL;
 135   char mailbox_name[250];
 136   m_task_t task = NULL;
 137   double clock = MSG_get_clock();
 138   //FIXME: argument of action ignored so far; semantic not clear
 139   //char *from=xbt_dynar_get_as(action,2,char*);
 140   sprintf(mailbox_name, "%s_%s", xbt_dynar_get_as(action, 2, char *),
 141           MSG_process_get_name(MSG_process_self()));
 142
 143   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 144     name = xbt_str_join(action, " ");
 145
 146 #ifdef HAVE_TRACING
 147   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
 148   int src_traced = get_rank(xbt_dynar_get_as(action, 2, char *));
 149   TRACE_smpi_ptp_in(rank, src_traced, rank, "recv");
 150 #endif
 151
 152   DEBUG1("Receiving: %s", name);
 153   MSG_task_receive(&task, mailbox_name);
 154   //  MSG_task_receive(&task, MSG_process_get_name(MSG_process_self()));
 155   VERB2("%s %f", name, MSG_get_clock() - clock);
 156   MSG_task_destroy(task);
 157
 158   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 159     free(name);
 160 #ifdef HAVE_TRACING
 161   TRACE_smpi_ptp_out(rank, src_traced, rank, "recv");
 162   TRACE_smpi_recv(rank, src_traced, rank);
 163 #endif
 164
 165   asynchronous_cleanup();
 166 }
 167
 168 static int spawned_recv(int argc, char *argv[])
 169 {
 170   m_task_t task = NULL;
 171   DEBUG1("Receiving on %s", argv[0]);
 172   MSG_task_receive(&task, argv[0]);
 173   DEBUG1("Received %s", MSG_task_get_name(task));
 174   DEBUG1("waiter on %s", MSG_process_get_name(MSG_process_self()));
 175   MSG_task_send(MSG_task_create("waiter", 0, 0, NULL),
 176                 MSG_process_get_name(MSG_process_self()));
 177
 178   MSG_task_destroy(task);
 179   return 0;
 180 }
 181
 182
 183 static void action_Irecv(xbt_dynar_t action)
 184 {
 185   char *name;
 186   m_process_t comm_helper;
 187   char mailbox_name[250];
 188   char **myargv;
 189   double clock = MSG_get_clock();
 190
 191   DEBUG1("Irecv on %s: spawn process ",
 192          MSG_process_get_name(MSG_process_self()));
 193 #ifdef HAVE_TRACING
 194   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
 195   int src_traced = get_rank(xbt_dynar_get_as(action, 2, char *));
 196   process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 197   counters->last_Irecv_sender_id = src_traced;
 198   MSG_process_set_data(MSG_process_self(), (void *) counters);
 199
 200   TRACE_smpi_ptp_in(rank, src_traced, rank, "Irecv");
 201 #endif
 202
 203   sprintf(mailbox_name, "%s_%s", xbt_dynar_get_as(action, 2, char *),
 204           MSG_process_get_name(MSG_process_self()));
 205   name = bprintf("%s_wait", MSG_process_get_name(MSG_process_self()));
 206   myargv = (char **) calloc(2, sizeof(char *));
 207
 208   myargv[0] = xbt_strdup(mailbox_name);
 209   myargv[1] = NULL;
 210   comm_helper = MSG_process_create_with_arguments(name, spawned_recv,
 211                                                   NULL, MSG_host_self(),
 212                                                   1, myargv);
 213
 214   VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 215
 216   free(name);
 217 #ifdef HAVE_TRACING
 218   TRACE_smpi_ptp_out(rank, src_traced, rank, "Irecv");
 219 #endif
 220
 221   asynchronous_cleanup();
 222 }
 223
 224
 225 static void action_wait(xbt_dynar_t action)
 226 {
 227   char *name = NULL;
 228   char task_name[80];
 229   m_task_t task = NULL;
 230   double clock = MSG_get_clock();
 231
 232   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 233     name = xbt_str_join(action, " ");
 234 #ifdef HAVE_TRACING
 235   process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 236   int src_traced = counters->last_Irecv_sender_id;
 237   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
 238   TRACE_smpi_ptp_in(rank, src_traced, rank, "wait");
 239 #endif
 240
 241   DEBUG1("Entering %s", name);
 242   sprintf(task_name, "%s_wait", MSG_process_get_name(MSG_process_self()));
 243   DEBUG1("wait: %s", task_name);
 244   MSG_task_receive(&task, task_name);
 245   MSG_task_destroy(task);
 246   VERB2("%s %f", name, MSG_get_clock() - clock);
 247   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 248     free(name);
 249 #ifdef HAVE_TRACING
 250   TRACE_smpi_ptp_out(rank, src_traced, rank, "wait");
 251   TRACE_smpi_recv(rank, src_traced, rank);
 252 #endif
 253
 254 }
 255
 256 /* FIXME: that's a poor man's implementation: we should take the message exchanges into account */
 257 static void action_barrier(xbt_dynar_t action)
 258 {
 259   char *name = NULL;
 260   static smx_mutex_t mutex = NULL;
 261   static smx_cond_t cond = NULL;
 262   static int processes_arrived_sofar=0;
 263
 264   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 265     name = xbt_str_join(action, " ");
 266
 267   if (mutex == NULL) {       // first arriving on the barrier
 268     mutex = SIMIX_req_mutex_init();
 269     cond = SIMIX_req_cond_init();
 270     processes_arrived_sofar=0;
 271   }
 272   DEBUG2("Entering barrier: %s (%d already there)", name,processes_arrived_sofar);
 273
 274   SIMIX_req_mutex_lock(mutex);
 275   if (++processes_arrived_sofar == communicator_size) {
 276     SIMIX_req_cond_broadcast(cond);
 277     SIMIX_req_mutex_unlock(mutex);
 278   } else {
 279     SIMIX_req_cond_wait(cond,mutex);
 280     SIMIX_req_mutex_unlock(mutex);
 281   }
 282
 283   DEBUG1("Exiting barrier: %s", name);
 284
 285   processes_arrived_sofar--;
 286   if (!processes_arrived_sofar) {
 287     SIMIX_req_cond_destroy(cond);
 288     SIMIX_req_mutex_destroy(mutex);
 289     mutex=NULL;
 290   }
 291
 292   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 293     free(name);
 294
 295 }
 296
 297 static void action_reduce(xbt_dynar_t action)
 298 {
 299         int i;
 300         char *reduce_identifier;
 301         char mailbox[80];
 302         double comm_size = parse_double(xbt_dynar_get_as(action, 2, char *));
 303         double comp_size = parse_double(xbt_dynar_get_as(action, 3, char *));
 304         m_task_t comp_task = NULL;
 305         const char *process_name;
 306         double clock = MSG_get_clock();
 307
 308         process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 309
 310         xbt_assert0(communicator_size, "Size of Communicator is not defined, "
 311                         "can't use collective operations");
 312
 313         process_name = MSG_process_get_name(MSG_process_self());
 314
 315         reduce_identifier = bprintf("reduce_%d", counters->reduce_counter++);
 316
 317         if (!strcmp(process_name, "p0")) {
 318                 DEBUG2("%s: %s is the Root", reduce_identifier, process_name);
 319
 320                 msg_comm_t *comms = xbt_new0(msg_comm_t,communicator_size-1);
 321             m_task_t *tasks = xbt_new0(m_task_t,communicator_size-1);
 322             for (i = 1; i < communicator_size; i++) {
 323               sprintf(mailbox, "%s_p%d_p0", reduce_identifier, i);
 324               comms[i-1] = MSG_task_irecv(&(tasks[i-1]),mailbox);
 325             }
 326             MSG_comm_waitall(comms,communicator_size-1,-1);
 327             for (i = 1; i < communicator_size; i++) {
 328                 MSG_comm_destroy(comms[i-1]);
 329                 MSG_task_destroy(tasks[i-1]);
 330             }
 331             free(tasks);
 332
 333             comp_task = MSG_task_create("reduce_comp", comp_size, 0, NULL);
 334             DEBUG1("%s: computing 'reduce_comp'", reduce_identifier);
 335             MSG_task_execute(comp_task);
 336             MSG_task_destroy(comp_task);
 337             DEBUG1("%s: computed", reduce_identifier);
 338
 339         } else {
 340                 DEBUG2("%s: %s sends", reduce_identifier, process_name);
 341                 sprintf(mailbox, "%s_%s_p0", reduce_identifier, process_name);
 342             DEBUG1("put on %s", mailbox);
 343             MSG_task_send(MSG_task_create(reduce_identifier, 0, comm_size, NULL),
 344                           mailbox);
 345         }
 346
 347         VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 348         free(reduce_identifier);
 349 }
 350
 351 static void action_bcast(xbt_dynar_t action)
 352 {
 353         int i;
 354         char *bcast_identifier;
 355         char mailbox[80];
 356         double comm_size = parse_double(xbt_dynar_get_as(action, 2, char *));
 357         m_task_t task = NULL;
 358         const char *process_name;
 359         double clock = MSG_get_clock();
 360
 361         process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 362
 363         xbt_assert0(communicator_size, "Size of Communicator is not defined, "
 364                         "can't use collective operations");
 365
 366         process_name = MSG_process_get_name(MSG_process_self());
 367
 368         bcast_identifier = bprintf("bcast_%d", counters->bcast_counter++);
 369
 370         if (!strcmp(process_name, "p0")) {
 371                 DEBUG2("%s: %s is the Root", bcast_identifier, process_name);
 372
 373             msg_comm_t *comms = xbt_new0(msg_comm_t,communicator_size-1);
 374
 375             for (i = 1; i < communicator_size; i++) {
 376               sprintf(mailbox, "%s_p0_p%d", bcast_identifier, i);
 377               comms[i-1] =
 378                   MSG_task_isend(MSG_task_create(mailbox,0,comm_size,NULL),
 379                       mailbox);
 380             }
 381             MSG_comm_waitall(comms,communicator_size-1,-1);
 382                 for (i = 1; i < communicator_size; i++)
 383                MSG_comm_destroy(comms[i-1]);
 384             free(comms);
 385
 386             DEBUG2("%s: all messages sent by %s have been received",
 387                    bcast_identifier, process_name);
 388
 389         } else {
 390             sprintf(mailbox, "%s_p0_%s", bcast_identifier, process_name);
 391             MSG_task_receive(&task, mailbox);
 392             MSG_task_destroy(task);
 393             DEBUG2("%s: %s has received", bcast_identifier, process_name);
 394         }
 395
 396         VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 397         free(bcast_identifier);
 398 }
 399
 400
 401 static void action_sleep(xbt_dynar_t action)
 402 {
 403   char *name = NULL;
 404   char *duration = xbt_dynar_get_as(action, 2, char *);
 405   double clock = MSG_get_clock();
 406
 407   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 408     name = xbt_str_join(action, " ");
 409
 410   DEBUG1("Entering %s", name);
 411   MSG_process_sleep(parse_double(duration));
 412   VERB2("%s %f ", name, MSG_get_clock() - clock);
 413
 414   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 415     free(name);
 416 }
 417
 418 static void action_allReduce(xbt_dynar_t action) {
 419   int i;
 420   char *allreduce_identifier;
 421   char mailbox[80];
 422   double comm_size = parse_double(xbt_dynar_get_as(action, 2, char *));
 423   double comp_size = parse_double(xbt_dynar_get_as(action, 3, char *));
 424   m_task_t task = NULL, comp_task = NULL;
 425   const char *process_name;
 426   double clock = MSG_get_clock();
 427
 428   process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 429
 430   xbt_assert0(communicator_size, "Size of Communicator is not defined, "
 431               "can't use collective operations");
 432
 433   process_name = MSG_process_get_name(MSG_process_self());
 434
 435   allreduce_identifier = bprintf("allReduce_%d", counters->allReduce_counter++);
 436
 437   if (!strcmp(process_name, "p0")) {
 438     DEBUG2("%s: %s is the Root", allreduce_identifier, process_name);
 439
 440     msg_comm_t *comms = xbt_new0(msg_comm_t,communicator_size-1);
 441     m_task_t *tasks = xbt_new0(m_task_t,communicator_size-1);
 442     for (i = 1; i < communicator_size; i++) {
 443       sprintf(mailbox, "%s_p%d_p0", allreduce_identifier, i);
 444       comms[i-1] = MSG_task_irecv(&(tasks[i-1]),mailbox);
 445     }
 446     MSG_comm_waitall(comms,communicator_size-1,-1);
 447     for (i = 1; i < communicator_size; i++) {
 448       MSG_comm_destroy(comms[i-1]);
 449       MSG_task_destroy(tasks[i-1]);
 450     }
 451     free(tasks);
 452
 453     comp_task = MSG_task_create("allReduce_comp", comp_size, 0, NULL);
 454     DEBUG1("%s: computing 'reduce_comp'", allreduce_identifier);
 455     MSG_task_execute(comp_task);
 456     MSG_task_destroy(comp_task);
 457     DEBUG1("%s: computed", allreduce_identifier);
 458
 459     for (i = 1; i < communicator_size; i++) {
 460       sprintf(mailbox, "%s_p0_p%d", allreduce_identifier, i);
 461       comms[i-1] =
 462           MSG_task_isend(MSG_task_create(mailbox,0,comm_size,NULL),
 463               mailbox);
 464     }
 465     MSG_comm_waitall(comms,communicator_size-1,-1);
 466     for (i = 1; i < communicator_size; i++)
 467        MSG_comm_destroy(comms[i-1]);
 468     free(comms);
 469
 470     DEBUG2("%s: all messages sent by %s have been received",
 471            allreduce_identifier, process_name);
 472
 473   } else {
 474     DEBUG2("%s: %s sends", allreduce_identifier, process_name);
 475     sprintf(mailbox, "%s_%s_p0", allreduce_identifier, process_name);
 476     DEBUG1("put on %s", mailbox);
 477     MSG_task_send(MSG_task_create(allreduce_identifier, 0, comm_size, NULL),
 478                   mailbox);
 479
 480     sprintf(mailbox, "%s_p0_%s", allreduce_identifier, process_name);
 481     MSG_task_receive(&task, mailbox);
 482     MSG_task_destroy(task);
 483     DEBUG2("%s: %s has received", allreduce_identifier, process_name);
 484   }
 485
 486   VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 487   free(allreduce_identifier);
 488 }
 489
 490 static void action_comm_size(xbt_dynar_t action)
 491 {
 492   char *name = NULL;
 493   char *size = xbt_dynar_get_as(action, 2, char *);
 494   double clock = MSG_get_clock();
 495
 496   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 497     name = xbt_str_join(action, " ");
 498   communicator_size = parse_double(size);
 499   VERB2("%s %f", name, MSG_get_clock() - clock);
 500   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 501     free(name);
 502 }
 503
 504 static void action_compute(xbt_dynar_t action)
 505 {
 506   char *name = NULL;
 507   char *amout = xbt_dynar_get_as(action, 2, char *);
 508   m_task_t task = MSG_task_create(name, parse_double(amout), 0, NULL);
 509   double clock = MSG_get_clock();
 510
 511   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 512     name = xbt_str_join(action, " ");
 513   DEBUG1("Entering %s", name);
 514   MSG_task_execute(task);
 515   MSG_task_destroy(task);
 516   VERB2("%s %f", name, MSG_get_clock() - clock);
 517   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 518     free(name);
 519 }
 520
 521 static void action_init(xbt_dynar_t action)
 522 {
 523 #ifdef HAVE_TRACING
 524   TRACE_smpi_init(get_rank(MSG_process_get_name(MSG_process_self())));
 525 #endif
 526   DEBUG0("Initialize the counters");
 527   process_globals_t globals = (process_globals_t) calloc(1, sizeof(s_process_globals_t));
 528   globals->isends = xbt_dynar_new(sizeof(msg_comm_t),NULL);
 529   MSG_process_set_data(MSG_process_self(),globals);
 530
 531 }
 532
 533 static void action_finalize(xbt_dynar_t action)
 534 {
 535 #ifdef HAVE_TRACING
 536   TRACE_smpi_finalize(get_rank(MSG_process_get_name(MSG_process_self())));
 537 #endif
 538   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
 539   if (globals){
 540     xbt_dynar_free_container(&(globals->isends));
 541     free(globals);
 542   }
 543 }
 544
 545 /** Main function */
 546 int main(int argc, char *argv[])
 547 {
 548   MSG_error_t res = MSG_OK;
 549
 550   /* Check the given arguments */
 551   MSG_global_init(&argc, argv);
 552   if (argc < 3) {
 553     printf("Usage: %s platform_file deployment_file [action_files]\n",
 554            argv[0]);
 555     printf
 556         ("example: %s msg_platform.xml msg_deployment.xml actions # if all actions are in the same file\n",
 557          argv[0]);
 558     printf
 559         ("example: %s msg_platform.xml msg_deployment.xml # if actions are in separate files, specified in deployment\n",
 560          argv[0]);
 561     exit(1);
 562   }
 563
 564   /*  Simulation setting */
 565   MSG_create_environment(argv[1]);
 566
 567   /* No need to register functions as in classical MSG programs: the actions get started anyway */
 568   MSG_launch_application(argv[2]);
 569
 570   /*   Action registration */
 571   MSG_action_register("init",     action_init);
 572   MSG_action_register("finalize", action_finalize);
 573   MSG_action_register("comm_size",action_comm_size);
 574   MSG_action_register("send",     action_send);
 575   MSG_action_register("Isend",    action_Isend);
 576   MSG_action_register("recv",     action_recv);
 577   MSG_action_register("Irecv",    action_Irecv);
 578   MSG_action_register("wait",     action_wait);
 579   MSG_action_register("barrier",  action_barrier);
 580   MSG_action_register("bcast",    action_bcast);
 581   MSG_action_register("reduce",   action_reduce);
 582   MSG_action_register("allReduce",action_allReduce);
 583   MSG_action_register("sleep",    action_sleep);
 584   MSG_action_register("compute",  action_compute);
 585
 586
 587   /* Actually do the simulation using MSG_action_trace_run */
 588   res = MSG_action_trace_run(argv[3]);  // it's ok to pass a NULL argument here
 589
 590   INFO1("Simulation time %g", MSG_get_clock());
 591   MSG_clean();
 592
 593   if (res == MSG_OK)
 594     return 0;
 595   else
 596     return 1;
 597 }                               /* end_of_main */