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 void SIMIX_ctx_raw_factory_init(smx_context_factory_t *factory);
  15
  16
  17 XBT_LOG_NEW_DEFAULT_CATEGORY(actions,
  18                              "Messages specific for this msg example");
  19 int communicator_size = 0;
  20
  21 static void action_Isend(xbt_dynar_t action);
  22
  23 typedef struct  {
  24   int last_Irecv_sender_id;
  25   int bcast_counter;
  26   int reduce_counter;
  27   int allReduce_counter;
  28   xbt_dynar_t isends; /* of msg_comm_t */
  29   /* Used to implement irecv+wait */
  30   xbt_dynar_t irecvs; /* of msg_comm_t */
  31   xbt_dynar_t tasks; /* of m_task_t */
  32 } s_process_globals_t, *process_globals_t;
  33
  34 /* Helper function */
  35 static double parse_double(const char *string)
  36 {
  37   double value;
  38   char *endptr;
  39
  40   value = strtod(string, &endptr);
  41   if (*endptr != '\0')
  42     THROW1(unknown_error, 0, "%s is not a double", string);
  43   return value;
  44 }
  45
  46 static int get_rank (const char *process_name)
  47 {
  48   return atoi(&(process_name[1]));
  49 }
  50
  51 static void asynchronous_cleanup(void) {
  52   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
  53
  54   /* Destroy any isend which correspond to completed communications */
  55   int found;
  56   msg_comm_t comm;
  57   while ((found = MSG_comm_testany(globals->isends)) != -1) {
  58     xbt_dynar_remove_at(globals->isends,found,&comm);
  59     MSG_comm_destroy(comm);
  60   }
  61 }
  62
  63 /* My actions */
  64 static void action_send(xbt_dynar_t action)
  65 {
  66   char *name = NULL;
  67   char to[250];
  68   char *size_str = xbt_dynar_get_as(action, 3, char *);
  69   double size=parse_double(size_str);
  70   double clock = MSG_get_clock(); /* this "call" is free thanks to inlining */
  71
  72   sprintf(to, "%s_%s", MSG_process_get_name(MSG_process_self()),
  73           xbt_dynar_get_as(action, 2, char *));
  74   //  char *to =  xbt_dynar_get_as(action, 2, char *);
  75
  76   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
  77     name = xbt_str_join(action, " ");
  78
  79 #ifdef HAVE_TRACING
  80   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
  81   int dst_traced = get_rank(xbt_dynar_get_as(action, 2, char *));
  82   TRACE_smpi_ptp_in(rank, rank, dst_traced, "send");
  83   TRACE_smpi_send(rank, rank, dst_traced);
  84 #endif
  85
  86   DEBUG2("Entering Send: %s (size: %lg)", name, size);
  87    if (size<65536) {
  88      action_Isend(action);
  89    } else {
  90      MSG_task_send(MSG_task_create(name, 0, size, NULL), to);
  91    }
  92
  93    VERB2("%s %f", name, MSG_get_clock() - clock);
  94
  95   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
  96     free(name);
  97
  98 #ifdef HAVE_TRACING
  99   TRACE_smpi_ptp_out(rank, rank, dst_traced, "send");
 100 #endif
 101
 102   asynchronous_cleanup();
 103 }
 104
 105 static void action_Isend(xbt_dynar_t action)
 106 {
 107   char to[250];
 108   //  char *to = xbt_dynar_get_as(action, 2, char *);
 109   char *size = xbt_dynar_get_as(action, 3, char *);
 110   double clock = MSG_get_clock();
 111   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
 112
 113
 114   sprintf(to, "%s_%s", MSG_process_get_name(MSG_process_self()),
 115           xbt_dynar_get_as(action, 2, char *));
 116
 117   msg_comm_t comm =
 118       MSG_task_isend( MSG_task_create(to,0,parse_double(size),NULL), to);
 119   xbt_dynar_push(globals->isends,&comm);
 120
 121   DEBUG1("Isend on %s", MSG_process_get_name(MSG_process_self()));
 122   VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 123
 124   asynchronous_cleanup();
 125 }
 126
 127
 128 static void action_recv(xbt_dynar_t action)
 129 {
 130   char *name = NULL;
 131   char mailbox_name[250];
 132   m_task_t task = NULL;
 133   double clock = MSG_get_clock();
 134
 135   sprintf(mailbox_name, "%s_%s", xbt_dynar_get_as(action, 2, char *),
 136           MSG_process_get_name(MSG_process_self()));
 137
 138   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 139     name = xbt_str_join(action, " ");
 140
 141 #ifdef HAVE_TRACING
 142   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
 143   int src_traced = get_rank(xbt_dynar_get_as(action, 2, char *));
 144   TRACE_smpi_ptp_in(rank, src_traced, rank, "recv");
 145 #endif
 146
 147   DEBUG1("Receiving: %s", name);
 148   MSG_task_receive(&task, mailbox_name);
 149   //  MSG_task_receive(&task, MSG_process_get_name(MSG_process_self()));
 150   VERB2("%s %f", name, MSG_get_clock() - clock);
 151   MSG_task_destroy(task);
 152
 153   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 154     free(name);
 155 #ifdef HAVE_TRACING
 156   TRACE_smpi_ptp_out(rank, src_traced, rank, "recv");
 157   TRACE_smpi_recv(rank, src_traced, rank);
 158 #endif
 159
 160   asynchronous_cleanup();
 161 }
 162
 163 static void action_Irecv(xbt_dynar_t action)
 164 {
 165   char mailbox[250];
 166   double clock = MSG_get_clock();
 167   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
 168
 169   DEBUG1("Irecv on %s", MSG_process_get_name(MSG_process_self()));
 170 #ifdef HAVE_TRACING
 171   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
 172   int src_traced = get_rank(xbt_dynar_get_as(action, 2, char *));
 173   globals->last_Irecv_sender_id = src_traced;
 174   MSG_process_set_data(MSG_process_self(), (void *) globals);
 175
 176   TRACE_smpi_ptp_in(rank, src_traced, rank, "Irecv");
 177 #endif
 178
 179   sprintf(mailbox, "%s_%s", xbt_dynar_get_as(action, 2, char *),
 180           MSG_process_get_name(MSG_process_self()));
 181   m_task_t t=NULL;
 182   xbt_dynar_push(globals->tasks,&t);
 183   msg_comm_t c =
 184       MSG_task_irecv(
 185           xbt_dynar_get_ptr(globals->tasks, xbt_dynar_length(globals->tasks)-1),
 186           mailbox);
 187   xbt_dynar_push(globals->irecvs,&c);
 188
 189   VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 190
 191 #ifdef HAVE_TRACING
 192   TRACE_smpi_ptp_out(rank, src_traced, rank, "Irecv");
 193 #endif
 194
 195   asynchronous_cleanup();
 196 }
 197
 198
 199 static void action_wait(xbt_dynar_t action)
 200 {
 201   char *name = NULL;
 202   m_task_t task = NULL;
 203   msg_comm_t comm;
 204   double clock = MSG_get_clock();
 205   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
 206
 207   xbt_assert1(xbt_dynar_length(globals->irecvs),
 208       "action wait not preceeded by any irecv: %s", xbt_str_join(action," "));
 209
 210   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 211     name = xbt_str_join(action, " ");
 212 #ifdef HAVE_TRACING
 213   process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 214   int src_traced = counters->last_Irecv_sender_id;
 215   int rank = get_rank(MSG_process_get_name(MSG_process_self()));
 216   TRACE_smpi_ptp_in(rank, src_traced, rank, "wait");
 217 #endif
 218
 219   DEBUG1("Entering %s", name);
 220   comm = xbt_dynar_pop_as(globals->irecvs,msg_comm_t);
 221   MSG_comm_wait(comm,-1);
 222   task = xbt_dynar_pop_as(globals->tasks,m_task_t);
 223   MSG_comm_destroy(comm);
 224   MSG_task_destroy(task);
 225
 226   VERB2("%s %f", name, MSG_get_clock() - clock);
 227   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 228     free(name);
 229 #ifdef HAVE_TRACING
 230   TRACE_smpi_ptp_out(rank, src_traced, rank, "wait");
 231   TRACE_smpi_recv(rank, src_traced, rank);
 232 #endif
 233
 234 }
 235
 236 /* FIXME: that's a poor man's implementation: we should take the message exchanges into account */
 237 static void action_barrier(xbt_dynar_t action)
 238 {
 239   char *name = NULL;
 240   static smx_mutex_t mutex = NULL;
 241   static smx_cond_t cond = NULL;
 242   static int processes_arrived_sofar=0;
 243
 244   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 245     name = xbt_str_join(action, " ");
 246
 247   if (mutex == NULL) {       // first arriving on the barrier
 248     mutex = SIMIX_req_mutex_init();
 249     cond = SIMIX_req_cond_init();
 250     processes_arrived_sofar=0;
 251   }
 252   DEBUG2("Entering barrier: %s (%d already there)", name,processes_arrived_sofar);
 253
 254   SIMIX_req_mutex_lock(mutex);
 255   if (++processes_arrived_sofar == communicator_size) {
 256     SIMIX_req_cond_broadcast(cond);
 257     SIMIX_req_mutex_unlock(mutex);
 258   } else {
 259     SIMIX_req_cond_wait(cond,mutex);
 260     SIMIX_req_mutex_unlock(mutex);
 261   }
 262
 263   DEBUG1("Exiting barrier: %s", name);
 264
 265   processes_arrived_sofar--;
 266   if (!processes_arrived_sofar) {
 267     SIMIX_req_cond_destroy(cond);
 268     SIMIX_req_mutex_destroy(mutex);
 269     mutex=NULL;
 270   }
 271
 272   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 273     free(name);
 274
 275 }
 276
 277 static void action_reduce(xbt_dynar_t action)
 278 {
 279         int i;
 280         char *reduce_identifier;
 281         char mailbox[80];
 282         double comm_size = parse_double(xbt_dynar_get_as(action, 2, char *));
 283         double comp_size = parse_double(xbt_dynar_get_as(action, 3, char *));
 284         m_task_t comp_task = NULL;
 285         const char *process_name;
 286         double clock = MSG_get_clock();
 287
 288         process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 289
 290         xbt_assert0(communicator_size, "Size of Communicator is not defined, "
 291                         "can't use collective operations");
 292
 293         process_name = MSG_process_get_name(MSG_process_self());
 294
 295         reduce_identifier = bprintf("reduce_%d", counters->reduce_counter++);
 296
 297         if (!strcmp(process_name, "p0")) {
 298                 DEBUG2("%s: %s is the Root", reduce_identifier, process_name);
 299
 300                 msg_comm_t *comms = xbt_new0(msg_comm_t,communicator_size-1);
 301             m_task_t *tasks = xbt_new0(m_task_t,communicator_size-1);
 302             for (i = 1; i < communicator_size; i++) {
 303               sprintf(mailbox, "%s_p%d_p0", reduce_identifier, i);
 304               comms[i-1] = MSG_task_irecv(&(tasks[i-1]),mailbox);
 305             }
 306             MSG_comm_waitall(comms,communicator_size-1,-1);
 307             for (i = 1; i < communicator_size; i++) {
 308                 MSG_comm_destroy(comms[i-1]);
 309                 MSG_task_destroy(tasks[i-1]);
 310             }
 311             free(tasks);
 312
 313             comp_task = MSG_task_create("reduce_comp", comp_size, 0, NULL);
 314             DEBUG1("%s: computing 'reduce_comp'", reduce_identifier);
 315             MSG_task_execute(comp_task);
 316             MSG_task_destroy(comp_task);
 317             DEBUG1("%s: computed", reduce_identifier);
 318
 319         } else {
 320                 DEBUG2("%s: %s sends", reduce_identifier, process_name);
 321                 sprintf(mailbox, "%s_%s_p0", reduce_identifier, process_name);
 322             DEBUG1("put on %s", mailbox);
 323             MSG_task_send(MSG_task_create(reduce_identifier, 0, comm_size, NULL),
 324                           mailbox);
 325         }
 326
 327         VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 328         free(reduce_identifier);
 329 }
 330
 331 static void action_bcast(xbt_dynar_t action)
 332 {
 333         int i;
 334         char *bcast_identifier;
 335         char mailbox[80];
 336         double comm_size = parse_double(xbt_dynar_get_as(action, 2, char *));
 337         m_task_t task = NULL;
 338         const char *process_name;
 339         double clock = MSG_get_clock();
 340
 341         process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 342
 343         xbt_assert0(communicator_size, "Size of Communicator is not defined, "
 344                         "can't use collective operations");
 345
 346         process_name = MSG_process_get_name(MSG_process_self());
 347
 348         bcast_identifier = bprintf("bcast_%d", counters->bcast_counter++);
 349
 350         if (!strcmp(process_name, "p0")) {
 351                 DEBUG2("%s: %s is the Root", bcast_identifier, process_name);
 352
 353             msg_comm_t *comms = xbt_new0(msg_comm_t,communicator_size-1);
 354
 355             for (i = 1; i < communicator_size; i++) {
 356               sprintf(mailbox, "%s_p0_p%d", bcast_identifier, i);
 357               comms[i-1] =
 358                   MSG_task_isend(MSG_task_create(mailbox,0,comm_size,NULL),
 359                       mailbox);
 360             }
 361             MSG_comm_waitall(comms,communicator_size-1,-1);
 362                 for (i = 1; i < communicator_size; i++)
 363                MSG_comm_destroy(comms[i-1]);
 364             free(comms);
 365
 366             DEBUG2("%s: all messages sent by %s have been received",
 367                    bcast_identifier, process_name);
 368
 369         } else {
 370             sprintf(mailbox, "%s_p0_%s", bcast_identifier, process_name);
 371             MSG_task_receive(&task, mailbox);
 372             MSG_task_destroy(task);
 373             DEBUG2("%s: %s has received", bcast_identifier, process_name);
 374         }
 375
 376         VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 377         free(bcast_identifier);
 378 }
 379
 380
 381 static void action_sleep(xbt_dynar_t action)
 382 {
 383   char *name = NULL;
 384   char *duration = xbt_dynar_get_as(action, 2, char *);
 385   double clock = MSG_get_clock();
 386
 387   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 388     name = xbt_str_join(action, " ");
 389
 390   DEBUG1("Entering %s", name);
 391   MSG_process_sleep(parse_double(duration));
 392   VERB2("%s %f ", name, MSG_get_clock() - clock);
 393
 394   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 395     free(name);
 396 }
 397
 398 static void action_allReduce(xbt_dynar_t action) {
 399   int i;
 400   char *allreduce_identifier;
 401   char mailbox[80];
 402   double comm_size = parse_double(xbt_dynar_get_as(action, 2, char *));
 403   double comp_size = parse_double(xbt_dynar_get_as(action, 3, char *));
 404   m_task_t task = NULL, comp_task = NULL;
 405   const char *process_name;
 406   double clock = MSG_get_clock();
 407
 408   process_globals_t counters = (process_globals_t) MSG_process_get_data(MSG_process_self());
 409
 410   xbt_assert0(communicator_size, "Size of Communicator is not defined, "
 411               "can't use collective operations");
 412
 413   process_name = MSG_process_get_name(MSG_process_self());
 414
 415   allreduce_identifier = bprintf("allReduce_%d", counters->allReduce_counter++);
 416
 417   if (!strcmp(process_name, "p0")) {
 418     DEBUG2("%s: %s is the Root", allreduce_identifier, process_name);
 419
 420     msg_comm_t *comms = xbt_new0(msg_comm_t,communicator_size-1);
 421     m_task_t *tasks = xbt_new0(m_task_t,communicator_size-1);
 422     for (i = 1; i < communicator_size; i++) {
 423       sprintf(mailbox, "%s_p%d_p0", allreduce_identifier, i);
 424       comms[i-1] = MSG_task_irecv(&(tasks[i-1]),mailbox);
 425     }
 426     MSG_comm_waitall(comms,communicator_size-1,-1);
 427     for (i = 1; i < communicator_size; i++) {
 428       MSG_comm_destroy(comms[i-1]);
 429       MSG_task_destroy(tasks[i-1]);
 430     }
 431     free(tasks);
 432
 433     comp_task = MSG_task_create("allReduce_comp", comp_size, 0, NULL);
 434     DEBUG1("%s: computing 'reduce_comp'", allreduce_identifier);
 435     MSG_task_execute(comp_task);
 436     MSG_task_destroy(comp_task);
 437     DEBUG1("%s: computed", allreduce_identifier);
 438
 439     for (i = 1; i < communicator_size; i++) {
 440       sprintf(mailbox, "%s_p0_p%d", allreduce_identifier, i);
 441       comms[i-1] =
 442           MSG_task_isend(MSG_task_create(mailbox,0,comm_size,NULL),
 443               mailbox);
 444     }
 445     MSG_comm_waitall(comms,communicator_size-1,-1);
 446     for (i = 1; i < communicator_size; i++)
 447        MSG_comm_destroy(comms[i-1]);
 448     free(comms);
 449
 450     DEBUG2("%s: all messages sent by %s have been received",
 451            allreduce_identifier, process_name);
 452
 453   } else {
 454     DEBUG2("%s: %s sends", allreduce_identifier, process_name);
 455     sprintf(mailbox, "%s_%s_p0", allreduce_identifier, process_name);
 456     DEBUG1("put on %s", mailbox);
 457     MSG_task_send(MSG_task_create(allreduce_identifier, 0, comm_size, NULL),
 458                   mailbox);
 459
 460     sprintf(mailbox, "%s_p0_%s", allreduce_identifier, process_name);
 461     MSG_task_receive(&task, mailbox);
 462     MSG_task_destroy(task);
 463     DEBUG2("%s: %s has received", allreduce_identifier, process_name);
 464   }
 465
 466   VERB2("%s %f", xbt_str_join(action, " "), MSG_get_clock() - clock);
 467   free(allreduce_identifier);
 468 }
 469
 470 static void action_comm_size(xbt_dynar_t action)
 471 {
 472   char *name = NULL;
 473   char *size = xbt_dynar_get_as(action, 2, char *);
 474   double clock = MSG_get_clock();
 475
 476   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 477     name = xbt_str_join(action, " ");
 478   communicator_size = parse_double(size);
 479   VERB2("%s %f", name, MSG_get_clock() - clock);
 480   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 481     free(name);
 482 }
 483
 484 static void action_compute(xbt_dynar_t action)
 485 {
 486   char *name = NULL;
 487   char *amout = xbt_dynar_get_as(action, 2, char *);
 488   m_task_t task = MSG_task_create(name, parse_double(amout), 0, NULL);
 489   double clock = MSG_get_clock();
 490
 491   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 492     name = xbt_str_join(action, " ");
 493   DEBUG1("Entering %s", name);
 494   MSG_task_execute(task);
 495   MSG_task_destroy(task);
 496   VERB2("%s %f", name, MSG_get_clock() - clock);
 497   if (XBT_LOG_ISENABLED(actions, xbt_log_priority_verbose))
 498     free(name);
 499 }
 500
 501 static void action_init(xbt_dynar_t action)
 502 {
 503 #ifdef HAVE_TRACING
 504   TRACE_smpi_init(get_rank(MSG_process_get_name(MSG_process_self())));
 505 #endif
 506   DEBUG0("Initialize the counters");
 507   process_globals_t globals = (process_globals_t) calloc(1, sizeof(s_process_globals_t));
 508   globals->isends = xbt_dynar_new(sizeof(msg_comm_t),NULL);
 509   globals->irecvs = xbt_dynar_new(sizeof(msg_comm_t),NULL);
 510   globals->tasks  = xbt_dynar_new(sizeof(m_task_t),NULL);
 511   MSG_process_set_data(MSG_process_self(),globals);
 512
 513 }
 514
 515 static void action_finalize(xbt_dynar_t action)
 516 {
 517 #ifdef HAVE_TRACING
 518   TRACE_smpi_finalize(get_rank(MSG_process_get_name(MSG_process_self())));
 519 #endif
 520   process_globals_t globals = (process_globals_t) MSG_process_get_data(MSG_process_self());
 521   if (globals){
 522     xbt_dynar_free_container(&(globals->isends));
 523     xbt_dynar_free_container(&(globals->irecvs));
 524     xbt_dynar_free_container(&(globals->tasks));
 525     free(globals);
 526   }
 527 }
 528
 529 /** Main function */
 530 int main(int argc, char *argv[])
 531 {
 532   MSG_error_t res = MSG_OK;
 533
 534   factory_initializer_to_use = SIMIX_ctx_raw_factory_init;
 535   /* Check the given arguments */
 536   MSG_global_init(&argc, argv);
 537   if (argc < 3) {
 538     printf("Usage: %s platform_file deployment_file [action_files]\n",
 539            argv[0]);
 540     printf
 541         ("example: %s msg_platform.xml msg_deployment.xml actions # if all actions are in the same file\n",
 542          argv[0]);
 543     printf
 544         ("example: %s msg_platform.xml msg_deployment.xml # if actions are in separate files, specified in deployment\n",
 545          argv[0]);
 546     exit(1);
 547   }
 548
 549   /*  Simulation setting */
 550   MSG_create_environment(argv[1]);
 551
 552   /* No need to register functions as in classical MSG programs: the actions get started anyway */
 553   MSG_launch_application(argv[2]);
 554
 555   /*   Action registration */
 556   MSG_action_register("init",     action_init);
 557   MSG_action_register("finalize", action_finalize);
 558   MSG_action_register("comm_size",action_comm_size);
 559   MSG_action_register("send",     action_send);
 560   MSG_action_register("Isend",    action_Isend);
 561   MSG_action_register("recv",     action_recv);
 562   MSG_action_register("Irecv",    action_Irecv);
 563   MSG_action_register("wait",     action_wait);
 564   MSG_action_register("barrier",  action_barrier);
 565   MSG_action_register("bcast",    action_bcast);
 566   MSG_action_register("reduce",   action_reduce);
 567   MSG_action_register("allReduce",action_allReduce);
 568   MSG_action_register("sleep",    action_sleep);
 569   MSG_action_register("compute",  action_compute);
 570
 571
 572   /* Actually do the simulation using MSG_action_trace_run */
 573   res = MSG_action_trace_run(argv[3]);  // it's ok to pass a NULL argument here
 574
 575   INFO1("Simulation time %g", MSG_get_clock());
 576   MSG_clean();
 577
 578   if (res == MSG_OK)
 579     return 0;
 580   else
 581     return 1;
 582 }                               /* end_of_main */