src/mc/checker/CommunicationDeterminismChecker.cpp

   1 /* Copyright (c) 2008-2020. The SimGrid Team. All rights reserved.          */
   2
   3 /* This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the license (GNU LGPL) which comes with this package. */
   5
   6 #include "src/mc/checker/CommunicationDeterminismChecker.hpp"
   7 #include "src/kernel/activity/MailboxImpl.hpp"
   8 #include "src/mc/Session.hpp"
   9 #include "src/mc/mc_config.hpp"
  10 #include "src/mc/mc_exit.hpp"
  11 #include "src/mc/mc_private.hpp"
  12 #include "src/mc/mc_request.hpp"
  13 #include "src/mc/mc_smx.hpp"
  14 #include "src/mc/mc_api.hpp"
  15
  16 #if HAVE_SMPI
  17 #include "smpi_request.hpp"
  18 #endif
  19
  20 #include <cstdint>
  21
  22 using simgrid::mc::remote;
  23 using mcapi = simgrid::mc::mc_api;
  24
  25 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_comm_determinism, mc, "Logging specific to MC communication determinism detection");
  26
  27 /********** Global variables **********/
  28
  29 std::vector<simgrid::mc::PatternCommunicationList> initial_communications_pattern;
  30 std::vector<std::vector<simgrid::mc::PatternCommunication*>> incomplete_communications_pattern;
  31
  32 /********** Static functions ***********/
  33
  34 static e_mc_comm_pattern_difference_t compare_comm_pattern(const simgrid::mc::PatternCommunication* comm1,
  35                                                            const simgrid::mc::PatternCommunication* comm2)
  36 {
  37   if(comm1->type != comm2->type)
  38     return TYPE_DIFF;
  39   if (comm1->rdv != comm2->rdv)
  40     return RDV_DIFF;
  41   if (comm1->src_proc != comm2->src_proc)
  42     return SRC_PROC_DIFF;
  43   if (comm1->dst_proc != comm2->dst_proc)
  44     return DST_PROC_DIFF;
  45   if (comm1->tag != comm2->tag)
  46     return TAG_DIFF;
  47   if (comm1->data.size() != comm2->data.size())
  48     return DATA_SIZE_DIFF;
  49   if (comm1->data != comm2->data)
  50     return DATA_DIFF;
  51   return NONE_DIFF;
  52 }
  53
  54 static char* print_determinism_result(e_mc_comm_pattern_difference_t diff, int process,
  55                                       const simgrid::mc::PatternCommunication* comm, unsigned int cursor)
  56 {
  57   char* type;
  58   char* res;
  59
  60   if (comm->type == simgrid::mc::PatternCommunicationType::send)
  61     type = bprintf("The send communications pattern of the process %d is different!", process - 1);
  62   else
  63     type = bprintf("The recv communications pattern of the process %d is different!", process - 1);
  64
  65   switch(diff) {
  66   case TYPE_DIFF:
  67     res = bprintf("%s Different type for communication #%u", type, cursor);
  68     break;
  69   case RDV_DIFF:
  70     res = bprintf("%s Different rdv for communication #%u", type, cursor);
  71     break;
  72   case TAG_DIFF:
  73     res = bprintf("%s Different tag for communication #%u", type, cursor);
  74     break;
  75   case SRC_PROC_DIFF:
  76     res = bprintf("%s Different source for communication #%u", type, cursor);
  77     break;
  78   case DST_PROC_DIFF:
  79     res = bprintf("%s Different destination for communication #%u", type, cursor);
  80     break;
  81   case DATA_SIZE_DIFF:
  82     res = bprintf("%s Different data size for communication #%u", type, cursor);
  83     break;
  84   case DATA_DIFF:
  85     res = bprintf("%s Different data for communication #%u", type, cursor);
  86     break;
  87   default:
  88     res = nullptr;
  89     break;
  90   }
  91
  92   return res;
  93 }
  94
  95 static void update_comm_pattern(simgrid::mc::PatternCommunication* comm_pattern,
  96                                 simgrid::mc::RemotePtr<simgrid::kernel::activity::CommImpl> comm_addr)
  97 {
  98   // HACK, type punning
  99   simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
 100   mc_model_checker->get_remote_simulation().read(temp_comm, comm_addr);
 101   const simgrid::kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 102
 103   smx_actor_t src_proc =
 104       mc_model_checker->get_remote_simulation().resolve_actor(simgrid::mc::remote(comm->src_actor_.get()));
 105   smx_actor_t dst_proc =
 106       mc_model_checker->get_remote_simulation().resolve_actor(simgrid::mc::remote(comm->dst_actor_.get()));
 107   comm_pattern->src_proc = src_proc->get_pid();
 108   comm_pattern->dst_proc = dst_proc->get_pid();
 109   comm_pattern->src_host = MC_smx_actor_get_host_name(src_proc);
 110   comm_pattern->dst_host = MC_smx_actor_get_host_name(dst_proc);
 111   if (comm_pattern->data.empty() && comm->src_buff_ != nullptr) {
 112     size_t buff_size;
 113     mc_model_checker->get_remote_simulation().read(&buff_size, remote(comm->dst_buff_size_));
 114     comm_pattern->data.resize(buff_size);
 115     mc_model_checker->get_remote_simulation().read_bytes(comm_pattern->data.data(), comm_pattern->data.size(),
 116                                                          remote(comm->src_buff_));
 117   }
 118 }
 119
 120 namespace simgrid {
 121 namespace mc {
 122
 123 void CommunicationDeterminismChecker::deterministic_comm_pattern(int process, const PatternCommunication* comm,
 124                                                                  int backtracking)
 125 {
 126   if (not backtracking) {
 127     PatternCommunicationList& list      = initial_communications_pattern[process];
 128     e_mc_comm_pattern_difference_t diff = compare_comm_pattern(list.list[list.index_comm].get(), comm);
 129
 130     if (diff != NONE_DIFF) {
 131       if (comm->type == PatternCommunicationType::send) {
 132         this->send_deterministic = false;
 133         if (this->send_diff != nullptr)
 134           xbt_free(this->send_diff);
 135         this->send_diff = print_determinism_result(diff, process, comm, list.index_comm + 1);
 136       } else {
 137         this->recv_deterministic = false;
 138         if (this->recv_diff != nullptr)
 139           xbt_free(this->recv_diff);
 140         this->recv_diff = print_determinism_result(diff, process, comm, list.index_comm + 1);
 141       }
 142       if (_sg_mc_send_determinism && not this->send_deterministic) {
 143         XBT_INFO("*********************************************************");
 144         XBT_INFO("***** Non-send-deterministic communications pattern *****");
 145         XBT_INFO("*********************************************************");
 146         XBT_INFO("%s", this->send_diff);
 147         xbt_free(this->send_diff);
 148         this->send_diff = nullptr;
 149         mc::session->log_state();
 150         mc_model_checker->exit(SIMGRID_MC_EXIT_NON_DETERMINISM);
 151       } else if (_sg_mc_comms_determinism && (not this->send_deterministic && not this->recv_deterministic)) {
 152         XBT_INFO("****************************************************");
 153         XBT_INFO("***** Non-deterministic communications pattern *****");
 154         XBT_INFO("****************************************************");
 155         if (this->send_diff) {
 156           XBT_INFO("%s", this->send_diff);
 157           xbt_free(this->send_diff);
 158           this->send_diff = nullptr;
 159         }
 160         if (this->recv_diff) {
 161           XBT_INFO("%s", this->recv_diff);
 162           xbt_free(this->recv_diff);
 163           this->recv_diff = nullptr;
 164         }
 165         mc::session->log_state();
 166         mc_model_checker->exit(SIMGRID_MC_EXIT_NON_DETERMINISM);
 167       }
 168     }
 169   }
 170 }
 171
 172 /********** Non Static functions ***********/
 173
 174 void CommunicationDeterminismChecker::get_comm_pattern(smx_simcall_t request, e_mc_call_type_t call_type,
 175                                                        int backtracking)
 176 {
 177   const smx_actor_t issuer = MC_smx_simcall_get_issuer(request);
 178   const mc::PatternCommunicationList& initial_pattern          = initial_communications_pattern[issuer->get_pid()];
 179   const std::vector<PatternCommunication*>& incomplete_pattern = incomplete_communications_pattern[issuer->get_pid()];
 180
 181   auto pattern   = std::make_unique<PatternCommunication>();
 182   pattern->index = initial_pattern.index_comm + incomplete_pattern.size();
 183
 184   if (call_type == MC_CALL_TYPE_SEND) {
 185     /* Create comm pattern */
 186     pattern->type      = PatternCommunicationType::send;
 187     pattern->comm_addr = static_cast<kernel::activity::CommImpl*>(simcall_comm_isend__getraw__result(request));
 188
 189     Remote<kernel::activity::CommImpl> temp_synchro;
 190     mc_model_checker->get_remote_simulation().read(temp_synchro, remote(pattern->comm_addr));
 191     const kernel::activity::CommImpl* synchro = temp_synchro.get_buffer();
 192
 193     char* remote_name = mc_model_checker->get_remote_simulation().read<char*>(RemotePtr<char*>(
 194         (uint64_t)(synchro->get_mailbox() ? &synchro->get_mailbox()->name_ : &synchro->mbox_cpy->name_)));
 195     // pattern->rdv      = mc_model_checker->get_remote_simulation().read_string(RemotePtr<char>(remote_name));
 196     pattern->rdv      = mc_api::get().get_pattern_comm_rdv(pattern->comm_addr);
 197     pattern->src_proc =
 198         mc_model_checker->get_remote_simulation().resolve_actor(mc::remote(synchro->src_actor_.get()))->get_pid();
 199     pattern->src_host = MC_smx_actor_get_host_name(issuer);
 200
 201 #if HAVE_SMPI
 202     simgrid::smpi::Request mpi_request;
 203     mc_model_checker->get_remote_simulation().read(
 204         &mpi_request, remote(static_cast<smpi::Request*>(simcall_comm_isend__get__data(request))));
 205     pattern->tag = mpi_request.tag();
 206 #endif
 207
 208     if (synchro->src_buff_ != nullptr) {
 209       pattern->data.resize(synchro->src_buff_size_);
 210       mc_model_checker->get_remote_simulation().read_bytes(pattern->data.data(), pattern->data.size(),
 211                                                            remote(synchro->src_buff_));
 212     }
 213 #if HAVE_SMPI
 214     if(mpi_request.detached()){
 215       if (this->initial_communications_pattern_done) {
 216         /* Evaluate comm determinism */
 217         this->deterministic_comm_pattern(pattern->src_proc, pattern.get(), backtracking);
 218         initial_communications_pattern[pattern->src_proc].index_comm++;
 219       } else {
 220         /* Store comm pattern */
 221         initial_communications_pattern[pattern->src_proc].list.push_back(std::move(pattern));
 222       }
 223       return;
 224     }
 225 #endif
 226   } else if (call_type == MC_CALL_TYPE_RECV) {
 227     pattern->type      = PatternCommunicationType::receive;
 228     pattern->comm_addr = static_cast<kernel::activity::CommImpl*>(simcall_comm_irecv__getraw__result(request));
 229
 230 #if HAVE_SMPI
 231     smpi::Request mpi_request;
 232     mc_model_checker->get_remote_simulation().read(
 233         &mpi_request, remote(static_cast<smpi::Request*>(simcall_comm_irecv__get__data(request))));
 234     pattern->tag = mpi_request.tag();
 235 #endif
 236
 237     Remote<kernel::activity::CommImpl> temp_comm;
 238     mc_model_checker->get_remote_simulation().read(temp_comm, remote(pattern->comm_addr));
 239     const kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 240
 241     char* remote_name;
 242     mc_model_checker->get_remote_simulation().read(
 243         &remote_name, remote(comm->get_mailbox() ? &xbt::string::to_string_data(comm->get_mailbox()->name_).data
 244                                                  : &xbt::string::to_string_data(comm->mbox_cpy->name_).data));
 245     pattern->rdv = mc_model_checker->get_remote_simulation().read_string(RemotePtr<char>(remote_name));
 246     pattern->dst_proc =
 247         mc_model_checker->get_remote_simulation().resolve_actor(mc::remote(comm->dst_actor_.get()))->get_pid();
 248     pattern->dst_host = MC_smx_actor_get_host_name(issuer);
 249   } else
 250     xbt_die("Unexpected call_type %i", (int) call_type);
 251
 252   XBT_DEBUG("Insert incomplete comm pattern %p for process %ld", pattern.get(), issuer->get_pid());
 253   incomplete_communications_pattern[issuer->get_pid()].push_back(pattern.release());
 254 }
 255
 256 void CommunicationDeterminismChecker::complete_comm_pattern(RemotePtr<kernel::activity::CommImpl> comm_addr,
 257                                                             unsigned int issuer, int backtracking)
 258 {
 259   /* Complete comm pattern */
 260   std::vector<PatternCommunication*>& incomplete_pattern = incomplete_communications_pattern[issuer];
 261   auto current_comm_pattern =
 262       std::find_if(begin(incomplete_pattern), end(incomplete_pattern),
 263                    [&comm_addr](const PatternCommunication* comm) { return remote(comm->comm_addr) == comm_addr; });
 264   if (current_comm_pattern == std::end(incomplete_pattern))
 265     xbt_die("Corresponding communication not found!");
 266
 267   update_comm_pattern(*current_comm_pattern, comm_addr);
 268   std::unique_ptr<PatternCommunication> comm_pattern(*current_comm_pattern);
 269   XBT_DEBUG("Remove incomplete comm pattern for process %u at cursor %zd", issuer,
 270             std::distance(begin(incomplete_pattern), current_comm_pattern));
 271   incomplete_pattern.erase(current_comm_pattern);
 272
 273   if (this->initial_communications_pattern_done) {
 274     /* Evaluate comm determinism */
 275     this->deterministic_comm_pattern(issuer, comm_pattern.get(), backtracking);
 276     initial_communications_pattern[issuer].index_comm++;
 277   } else {
 278     /* Store comm pattern */
 279     initial_communications_pattern[issuer].list.push_back(std::move(comm_pattern));
 280   }
 281 }
 282
 283 CommunicationDeterminismChecker::CommunicationDeterminismChecker(Session& s) : Checker(s)
 284 {
 285 }
 286
 287 CommunicationDeterminismChecker::~CommunicationDeterminismChecker() = default;
 288
 289 RecordTrace CommunicationDeterminismChecker::get_record_trace() // override
 290 {
 291   RecordTrace res;
 292   for (auto const& state : stack_)
 293     res.push_back(state->get_transition());
 294   return res;
 295 }
 296
 297 std::vector<std::string> CommunicationDeterminismChecker::get_textual_trace() // override
 298 {
 299   std::vector<std::string> trace;
 300   for (auto const& state : stack_) {
 301     smx_simcall_t req = &state->executed_req_;
 302     if (req)
 303       trace.push_back(request_to_string(req, state->transition_.argument_, RequestType::executed));
 304   }
 305   return trace;
 306 }
 307
 308 void CommunicationDeterminismChecker::log_state() // override
 309 {
 310   if (_sg_mc_comms_determinism) {
 311     if (this->send_deterministic && not this->recv_deterministic) {
 312       XBT_INFO("*******************************************************");
 313       XBT_INFO("**** Only-send-deterministic communication pattern ****");
 314       XBT_INFO("*******************************************************");
 315       XBT_INFO("%s", this->recv_diff);
 316     }
 317     if (not this->send_deterministic && this->recv_deterministic) {
 318       XBT_INFO("*******************************************************");
 319       XBT_INFO("**** Only-recv-deterministic communication pattern ****");
 320       XBT_INFO("*******************************************************");
 321       XBT_INFO("%s", this->send_diff);
 322     }
 323   }
 324   XBT_INFO("Expanded states = %lu", expanded_states_count_);
 325   XBT_INFO("Visited states = %lu", mcapi::get().mc_get_visited_states());
 326   XBT_INFO("Executed transitions = %lu", mcapi::get().mc_get_executed_trans());
 327   XBT_INFO("Send-deterministic : %s", this->send_deterministic ? "Yes" : "No");
 328   if (_sg_mc_comms_determinism)
 329     XBT_INFO("Recv-deterministic : %s", this->recv_deterministic ? "Yes" : "No");
 330 }
 331
 332 void CommunicationDeterminismChecker::prepare()
 333 {
 334   const int maxpid = mcapi::get().get_maxpid();
 335
 336   initial_communications_pattern.resize(maxpid);
 337   incomplete_communications_pattern.resize(maxpid);
 338
 339   ++expanded_states_count_;
 340   auto initial_state = std::make_unique<State>(expanded_states_count_);
 341
 342   XBT_DEBUG("********* Start communication determinism verification *********");
 343
 344   /* Get an enabled actor and insert it in the interleave set of the initial state */
 345   auto actors = mcapi::get().get_actors();
 346   for (auto& actor : actors)
 347     if (mcapi::get().actor_is_enabled(actor.copy.get_buffer()->get_pid()))
 348       initial_state->add_interleaving_set(actor.copy.get_buffer());
 349
 350   stack_.push_back(std::move(initial_state));
 351 }
 352
 353 static inline bool all_communications_are_finished()
 354 {
 355   auto maxpid = mcapi::get().get_maxpid();
 356   for (size_t current_actor = 1; current_actor < maxpid; current_actor++) {
 357     if (not incomplete_communications_pattern[current_actor].empty()) {
 358       XBT_DEBUG("Some communications are not finished, cannot stop the exploration! State not visited.");
 359       return false;
 360     }
 361   }
 362   return true;
 363 }
 364
 365 void CommunicationDeterminismChecker::restoreState()
 366 {
 367   /* Intermediate backtracking */
 368   State* last_state = stack_.back().get();
 369   if (last_state->system_state_) {
 370     last_state->system_state_->restore(&mcapi::get().mc_get_remote_simulation());
 371     MC_restore_communications_pattern(last_state);
 372     return;
 373   }
 374
 375   /* Restore the initial state */
 376   mcapi::get().s_restore_initial_state();
 377
 378   unsigned n = mcapi::get().get_maxpid();
 379   assert(n == incomplete_communications_pattern.size());
 380   assert(n == initial_communications_pattern.size());
 381   for (unsigned j=0; j < n ; j++) {
 382     incomplete_communications_pattern[j].clear();
 383     initial_communications_pattern[j].index_comm = 0;
 384   }
 385
 386   /* Traverse the stack from the state at position start and re-execute the transitions */
 387   for (std::unique_ptr<simgrid::mc::State> const& state : stack_) {
 388     if (state == stack_.back())
 389       break;
 390
 391     int req_num             = state->transition_.argument_;
 392     const s_smx_simcall* saved_req = &state->executed_req_;
 393     xbt_assert(saved_req);
 394
 395     /* because we got a copy of the executed request, we have to fetch the
 396        real one, pointed by the request field of the issuer process */
 397
 398     const smx_actor_t issuer = mcapi::get().mc_smx_simcall_get_issuer(saved_req);
 399     smx_simcall_t req        = &issuer->simcall_;
 400
 401     /* TODO : handle test and testany simcalls */
 402     e_mc_call_type_t call = MC_get_call_type(req);
 403     mcapi::get().handle_simcall(state->transition_);
 404     MC_handle_comm_pattern(call, req, req_num, 1);
 405     mcapi::get().mc_wait_for_requests();
 406
 407     /* Update statistics */
 408     mcapi::get().mc_inc_visited_states();
 409     mcapi::get().mc_inc_executed_trans();
 410   }
 411 }
 412
 413 void CommunicationDeterminismChecker::real_run()
 414 {
 415   std::unique_ptr<VisitedState> visited_state = nullptr;
 416   smx_simcall_t req = nullptr;
 417
 418   while (not stack_.empty()) {
 419     /* Get current state */
 420     State* cur_state = stack_.back().get();
 421
 422     XBT_DEBUG("**************************************************");
 423     XBT_DEBUG("Exploration depth = %zu (state = %d, interleaved processes = %zu)", stack_.size(), cur_state->num_,
 424               cur_state->interleave_size());
 425
 426     /* Update statistics */
 427     mcapi::get().mc_inc_visited_states();
 428
 429     if (stack_.size() <= (std::size_t)_sg_mc_max_depth)
 430       req = mcapi::get().mc_state_choose_request(cur_state);
 431     else
 432       req = nullptr;
 433
 434     if (req != nullptr && visited_state == nullptr) {
 435       int req_num = cur_state->transition_.argument_;
 436
 437       XBT_DEBUG("Execute: %s", mcapi::get().request_to_string(req, req_num, RequestType::simix).c_str());
 438
 439       std::string req_str;
 440       if (dot_output != nullptr)
 441         req_str = mcapi::get().request_get_dot_output(req, req_num);
 442
 443       mcapi::get().mc_inc_executed_trans();
 444
 445       /* TODO : handle test and testany simcalls */
 446       e_mc_call_type_t call = MC_CALL_TYPE_NONE;
 447       if (_sg_mc_comms_determinism || _sg_mc_send_determinism)
 448         call = MC_get_call_type(req);
 449
 450       /* Answer the request */
 451       mcapi::get().handle_simcall(cur_state->transition_);
 452       /* After this call req is no longer useful */
 453
 454       MC_handle_comm_pattern(call, req, req_num, 0);
 455
 456
 457       /* Wait for requests (schedules processes) */
 458       mcapi::get().mc_wait_for_requests();
 459
 460       /* Create the new expanded state */
 461       ++expanded_states_count_;
 462       auto next_state = std::make_unique<State>(expanded_states_count_);
 463
 464       /* If comm determinism verification, we cannot stop the exploration if some communications are not finished (at
 465        * least, data are transferred). These communications  are incomplete and they cannot be analyzed and compared
 466        * with the initial pattern. */
 467       bool compare_snapshots = this->initial_communications_pattern_done && all_communications_are_finished();
 468
 469       if (_sg_mc_max_visited_states != 0)
 470         visited_state = visited_states_.addVisitedState(expanded_states_count_, next_state.get(), compare_snapshots);
 471       else
 472         visited_state = nullptr;
 473
 474       if (visited_state == nullptr) {
 475         /* Get enabled actors and insert them in the interleave set of the next state */
 476         auto actors = mcapi::get().mc_get_remote_simulation().actors();
 477         for (auto& actor : actors)
 478           if (mcapi::get().actor_is_enabled(actor.copy.get_buffer()->get_pid()))
 479             next_state->add_interleaving_set(actor.copy.get_buffer());
 480
 481         if (dot_output != nullptr)
 482           fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", cur_state->num_, next_state->num_, req_str.c_str());
 483
 484       } else if (dot_output != nullptr)
 485         fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", cur_state->num_,
 486                 visited_state->original_num == -1 ? visited_state->num : visited_state->original_num, req_str.c_str());
 487
 488       stack_.push_back(std::move(next_state));
 489     } else {
 490       if (stack_.size() > (std::size_t) _sg_mc_max_depth)
 491         XBT_WARN("/!\\ Max depth reached! /!\\ ");
 492       else if (visited_state != nullptr)
 493         XBT_DEBUG("State already visited (equal to state %d), exploration stopped on this path.",
 494             visited_state->original_num == -1 ? visited_state->num : visited_state->original_num);
 495       else
 496         XBT_DEBUG("There are no more processes to interleave. (depth %zu)", stack_.size());
 497
 498       this->initial_communications_pattern_done = true;
 499
 500       /* Trash the current state, no longer needed */
 501       XBT_DEBUG("Delete state %d at depth %zu", cur_state->num_, stack_.size());
 502       stack_.pop_back();
 503
 504       visited_state = nullptr;
 505
 506       /* Check for deadlocks */
 507       if (mcapi::get().mc_check_deadlock()) {
 508         mcapi::get().mc_show_deadlock();
 509         throw simgrid::mc::DeadlockError();
 510       }
 511
 512       while (not stack_.empty()) {
 513         std::unique_ptr<State> state(std::move(stack_.back()));
 514         stack_.pop_back();
 515         if (state->interleave_size() && stack_.size() < (std::size_t)_sg_mc_max_depth) {
 516           /* We found a back-tracking point, let's loop */
 517           XBT_DEBUG("Back-tracking to state %d at depth %zu", state->num_, stack_.size() + 1);
 518           stack_.push_back(std::move(state));
 519
 520           this->restoreState();
 521
 522           XBT_DEBUG("Back-tracking to state %d at depth %zu done", stack_.back()->num_, stack_.size());
 523
 524           break;
 525         } else {
 526           XBT_DEBUG("Delete state %d at depth %zu", state->num_, stack_.size() + 1);
 527         }
 528       }
 529     }
 530   }
 531
 532   mcapi::get().s_log_state();
 533 }
 534
 535 void CommunicationDeterminismChecker::run()
 536 {
 537   XBT_INFO("Check communication determinism");
 538   mcapi::get().s_initialize();
 539
 540   this->prepare();
 541   this->real_run();
 542 }
 543
 544 Checker* createCommunicationDeterminismChecker(Session& s)
 545 {
 546   return new CommunicationDeterminismChecker(s);
 547 }
 548
 549 } // namespace mc
 550 } // namespace simgrid