src/mc/checker/CommunicationDeterminismChecker.cpp

   1 /* Copyright (c) 2008-2019. 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
  15 #if HAVE_SMPI
  16 #include "smpi_request.hpp"
  17 #endif
  18
  19 #include <cstdint>
  20
  21 using simgrid::mc::remote;
  22
  23 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_comm_determinism, mc, "Logging specific to MC communication determinism detection");
  24
  25 /********** Global variables **********/
  26
  27 std::vector<simgrid::mc::PatternCommunicationList> initial_communications_pattern;
  28 std::vector<std::vector<simgrid::mc::PatternCommunication*>> incomplete_communications_pattern;
  29
  30 /********** Static functions ***********/
  31
  32 static e_mc_comm_pattern_difference_t compare_comm_pattern(simgrid::mc::PatternCommunication* comm1,
  33                                                            simgrid::mc::PatternCommunication* comm2)
  34 {
  35   if(comm1->type != comm2->type)
  36     return TYPE_DIFF;
  37   if (comm1->rdv != comm2->rdv)
  38     return RDV_DIFF;
  39   if (comm1->src_proc != comm2->src_proc)
  40     return SRC_PROC_DIFF;
  41   if (comm1->dst_proc != comm2->dst_proc)
  42     return DST_PROC_DIFF;
  43   if (comm1->tag != comm2->tag)
  44     return TAG_DIFF;
  45   if (comm1->data.size() != comm2->data.size())
  46     return DATA_SIZE_DIFF;
  47   if (comm1->data != comm2->data)
  48     return DATA_DIFF;
  49   return NONE_DIFF;
  50 }
  51
  52 static char* print_determinism_result(e_mc_comm_pattern_difference_t diff, int process,
  53                                       simgrid::mc::PatternCommunication* comm, unsigned int cursor)
  54 {
  55   char* type;
  56   char* res;
  57
  58   if (comm->type == simgrid::mc::PatternCommunicationType::send)
  59     type = bprintf("The send communications pattern of the process %d is different!", process - 1);
  60   else
  61     type = bprintf("The recv communications pattern of the process %d is different!", process - 1);
  62
  63   switch(diff) {
  64   case TYPE_DIFF:
  65     res = bprintf("%s Different type for communication #%u", type, cursor);
  66     break;
  67   case RDV_DIFF:
  68     res = bprintf("%s Different rdv for communication #%u", type, cursor);
  69     break;
  70   case TAG_DIFF:
  71     res = bprintf("%s Different tag for communication #%u", type, cursor);
  72     break;
  73   case SRC_PROC_DIFF:
  74     res = bprintf("%s Different source for communication #%u", type, cursor);
  75     break;
  76   case DST_PROC_DIFF:
  77     res = bprintf("%s Different destination for communication #%u", type, cursor);
  78     break;
  79   case DATA_SIZE_DIFF:
  80     res = bprintf("%s Different data size for communication #%u", type, cursor);
  81     break;
  82   case DATA_DIFF:
  83     res = bprintf("%s Different data for communication #%u", type, cursor);
  84     break;
  85   default:
  86     res = nullptr;
  87     break;
  88   }
  89
  90   return res;
  91 }
  92
  93 static void update_comm_pattern(simgrid::mc::PatternCommunication* comm_pattern,
  94                                 simgrid::mc::RemotePtr<simgrid::kernel::activity::CommImpl> comm_addr)
  95 {
  96   // HACK, type punning
  97   simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
  98   mc_model_checker->process().read(temp_comm, comm_addr);
  99   simgrid::kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 100
 101   smx_actor_t src_proc   = mc_model_checker->process().resolve_actor(simgrid::mc::remote(comm->src_actor_.get()));
 102   smx_actor_t dst_proc   = mc_model_checker->process().resolve_actor(simgrid::mc::remote(comm->dst_actor_.get()));
 103   comm_pattern->src_proc = src_proc->get_pid();
 104   comm_pattern->dst_proc = dst_proc->get_pid();
 105   comm_pattern->src_host = MC_smx_actor_get_host_name(src_proc);
 106   comm_pattern->dst_host = MC_smx_actor_get_host_name(dst_proc);
 107   if (comm_pattern->data.size() == 0 && comm->src_buff_ != nullptr) {
 108     size_t buff_size;
 109     mc_model_checker->process().read(&buff_size, remote(comm->dst_buff_size_));
 110     comm_pattern->data.resize(buff_size);
 111     mc_model_checker->process().read_bytes(comm_pattern->data.data(), comm_pattern->data.size(),
 112                                            remote(comm->src_buff_));
 113   }
 114 }
 115
 116 namespace simgrid {
 117 namespace mc {
 118
 119 void CommunicationDeterminismChecker::deterministic_comm_pattern(int process, simgrid::mc::PatternCommunication* comm,
 120                                                                  int backtracking)
 121 {
 122   if (not backtracking) {
 123     simgrid::mc::PatternCommunicationList& list = initial_communications_pattern[process];
 124     e_mc_comm_pattern_difference_t diff = compare_comm_pattern(list.list[list.index_comm].get(), comm);
 125
 126     if (diff != NONE_DIFF) {
 127       if (comm->type == simgrid::mc::PatternCommunicationType::send) {
 128         this->send_deterministic = 0;
 129         if (this->send_diff != nullptr)
 130           xbt_free(this->send_diff);
 131         this->send_diff = print_determinism_result(diff, process, comm, list.index_comm + 1);
 132       } else {
 133         this->recv_deterministic = 0;
 134         if (this->recv_diff != nullptr)
 135           xbt_free(this->recv_diff);
 136         this->recv_diff = print_determinism_result(diff, process, comm, list.index_comm + 1);
 137       }
 138       if (_sg_mc_send_determinism && not this->send_deterministic) {
 139         XBT_INFO("*********************************************************");
 140         XBT_INFO("***** Non-send-deterministic communications pattern *****");
 141         XBT_INFO("*********************************************************");
 142         XBT_INFO("%s", this->send_diff);
 143         xbt_free(this->send_diff);
 144         this->send_diff = nullptr;
 145         simgrid::mc::session->log_state();
 146         mc_model_checker->exit(SIMGRID_MC_EXIT_NON_DETERMINISM);
 147       } else if (_sg_mc_comms_determinism && (not this->send_deterministic && not this->recv_deterministic)) {
 148         XBT_INFO("****************************************************");
 149         XBT_INFO("***** Non-deterministic communications pattern *****");
 150         XBT_INFO("****************************************************");
 151         if (this->send_diff) {
 152           XBT_INFO("%s", this->send_diff);
 153           xbt_free(this->send_diff);
 154           this->send_diff = nullptr;
 155         }
 156         if (this->recv_diff) {
 157           XBT_INFO("%s", this->recv_diff);
 158           xbt_free(this->recv_diff);
 159           this->recv_diff = nullptr;
 160         }
 161         simgrid::mc::session->log_state();
 162         mc_model_checker->exit(SIMGRID_MC_EXIT_NON_DETERMINISM);
 163       }
 164     }
 165   }
 166 }
 167
 168 /********** Non Static functions ***********/
 169
 170 void CommunicationDeterminismChecker::get_comm_pattern(smx_simcall_t request, e_mc_call_type_t call_type,
 171                                                        int backtracking)
 172 {
 173   const smx_actor_t issuer = MC_smx_simcall_get_issuer(request);
 174   const simgrid::mc::PatternCommunicationList& initial_pattern = initial_communications_pattern[issuer->get_pid()];
 175   const std::vector<simgrid::mc::PatternCommunication*>& incomplete_pattern =
 176       incomplete_communications_pattern[issuer->get_pid()];
 177
 178   std::unique_ptr<simgrid::mc::PatternCommunication> pattern(new simgrid::mc::PatternCommunication());
 179   pattern->index = initial_pattern.index_comm + incomplete_pattern.size();
 180
 181   if (call_type == MC_CALL_TYPE_SEND) {
 182     /* Create comm pattern */
 183     pattern->type = simgrid::mc::PatternCommunicationType::send;
 184     pattern->comm_addr = static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_isend__getraw__result(request));
 185
 186     simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_synchro;
 187     mc_model_checker->process().read(temp_synchro,
 188                                      remote(static_cast<simgrid::kernel::activity::CommImpl*>(pattern->comm_addr)));
 189     simgrid::kernel::activity::CommImpl* synchro =
 190         static_cast<simgrid::kernel::activity::CommImpl*>(temp_synchro.get_buffer());
 191
 192     char* remote_name = mc_model_checker->process().read<char*>(RemotePtr<char*>(
 193         (uint64_t)(synchro->get_mailbox() ? &synchro->get_mailbox()->name_ : &synchro->mbox_cpy->name_)));
 194     pattern->rdv      = mc_model_checker->process().read_string(RemotePtr<char>(remote_name));
 195     pattern->src_proc =
 196         mc_model_checker->process().resolve_actor(simgrid::mc::remote(synchro->src_actor_.get()))->get_pid();
 197     pattern->src_host = MC_smx_actor_get_host_name(issuer);
 198
 199 #if HAVE_SMPI
 200     simgrid::smpi::Request mpi_request;
 201     mc_model_checker->process().read(
 202         &mpi_request, remote(static_cast<simgrid::smpi::Request*>(simcall_comm_isend__get__data(request))));
 203     pattern->tag = mpi_request.tag();
 204 #endif
 205
 206     if (synchro->src_buff_ != nullptr) {
 207       pattern->data.resize(synchro->src_buff_size_);
 208       mc_model_checker->process().read_bytes(pattern->data.data(), pattern->data.size(), remote(synchro->src_buff_));
 209     }
 210 #if HAVE_SMPI
 211     if(mpi_request.detached()){
 212       if (this->initial_communications_pattern_done) {
 213         /* Evaluate comm determinism */
 214         this->deterministic_comm_pattern(pattern->src_proc, pattern.get(), backtracking);
 215         initial_communications_pattern[pattern->src_proc].index_comm++;
 216       } else {
 217         /* Store comm pattern */
 218         initial_communications_pattern[pattern->src_proc].list.push_back(std::move(pattern));
 219       }
 220       return;
 221     }
 222 #endif
 223   } else if (call_type == MC_CALL_TYPE_RECV) {
 224     pattern->type = simgrid::mc::PatternCommunicationType::receive;
 225     pattern->comm_addr = static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_irecv__getraw__result(request));
 226
 227 #if HAVE_SMPI
 228     simgrid::smpi::Request mpi_request;
 229     mc_model_checker->process().read(
 230         &mpi_request, remote(static_cast<simgrid::smpi::Request*>(simcall_comm_irecv__get__data(request))));
 231     pattern->tag = mpi_request.tag();
 232 #endif
 233
 234     simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
 235     mc_model_checker->process().read(temp_comm,
 236                                      remote(static_cast<simgrid::kernel::activity::CommImpl*>(pattern->comm_addr)));
 237     simgrid::kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 238
 239     char* remote_name;
 240     mc_model_checker->process().read(&remote_name,
 241                                      remote(comm->get_mailbox()
 242                                                 ? &simgrid::xbt::string::to_string_data(comm->get_mailbox()->name_).data
 243                                                 : &simgrid::xbt::string::to_string_data(comm->mbox_cpy->name_).data));
 244     pattern->rdv      = mc_model_checker->process().read_string(RemotePtr<char>(remote_name));
 245     pattern->dst_proc =
 246         mc_model_checker->process().resolve_actor(simgrid::mc::remote(comm->dst_actor_.get()))->get_pid();
 247     pattern->dst_host = MC_smx_actor_get_host_name(issuer);
 248   } else
 249     xbt_die("Unexpected call_type %i", (int) call_type);
 250
 251   XBT_DEBUG("Insert incomplete comm pattern %p for process %ld", pattern.get(), issuer->get_pid());
 252   incomplete_communications_pattern[issuer->get_pid()].push_back(pattern.release());
 253 }
 254
 255 void CommunicationDeterminismChecker::complete_comm_pattern(
 256     simgrid::mc::RemotePtr<simgrid::kernel::activity::CommImpl> comm_addr, unsigned int issuer, int backtracking)
 257 {
 258   /* Complete comm pattern */
 259   std::vector<simgrid::mc::PatternCommunication*>& incomplete_pattern = incomplete_communications_pattern[issuer];
 260   auto current_comm_pattern = std::find_if(
 261       begin(incomplete_pattern), end(incomplete_pattern),
 262       [&comm_addr](simgrid::mc::PatternCommunication* comm) { return remote(comm->comm_addr) == comm_addr; });
 263   if (current_comm_pattern == std::end(incomplete_pattern))
 264     xbt_die("Corresponding communication not found!");
 265
 266   update_comm_pattern(*current_comm_pattern, comm_addr);
 267   std::unique_ptr<simgrid::mc::PatternCommunication> comm_pattern(*current_comm_pattern);
 268   XBT_DEBUG("Remove incomplete comm pattern for process %u at cursor %zd", issuer,
 269             std::distance(begin(incomplete_pattern), current_comm_pattern));
 270   incomplete_pattern.erase(current_comm_pattern);
 271
 272   if (this->initial_communications_pattern_done) {
 273     /* Evaluate comm determinism */
 274     this->deterministic_comm_pattern(issuer, comm_pattern.get(), backtracking);
 275     initial_communications_pattern[issuer].index_comm++;
 276   } else {
 277     /* Store comm pattern */
 278     initial_communications_pattern[issuer].list.push_back(std::move(comm_pattern));
 279   }
 280 }
 281
 282 CommunicationDeterminismChecker::CommunicationDeterminismChecker(Session& s) : Checker(s)
 283 {
 284 }
 285
 286 CommunicationDeterminismChecker::~CommunicationDeterminismChecker() = default;
 287
 288 RecordTrace CommunicationDeterminismChecker::get_record_trace() // override
 289 {
 290   RecordTrace res;
 291   for (auto const& state : stack_)
 292     res.push_back(state->get_transition());
 293   return res;
 294 }
 295
 296 std::vector<std::string> CommunicationDeterminismChecker::get_textual_trace() // override
 297 {
 298   std::vector<std::string> trace;
 299   for (auto const& state : stack_) {
 300     smx_simcall_t req = &state->executed_req_;
 301     if (req)
 302       trace.push_back(
 303           simgrid::mc::request_to_string(req, state->transition_.argument_, simgrid::mc::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", mc_model_checker->visited_states);
 326   XBT_INFO("Executed transitions = %lu", mc_model_checker->executed_transitions);
 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 = MC_smx_get_maxpid();
 335
 336   initial_communications_pattern.resize(maxpid);
 337   incomplete_communications_pattern.resize(maxpid);
 338
 339   std::unique_ptr<simgrid::mc::State> initial_state(new simgrid::mc::State(++expanded_states_count_));
 340
 341   XBT_DEBUG("********* Start communication determinism verification *********");
 342
 343   /* Get an enabled actor and insert it in the interleave set of the initial state */
 344   for (auto& actor : mc_model_checker->process().actors())
 345     if (simgrid::mc::actor_is_enabled(actor.copy.get_buffer()))
 346       initial_state->add_interleaving_set(actor.copy.get_buffer());
 347
 348   stack_.push_back(std::move(initial_state));
 349 }
 350
 351 static inline bool all_communications_are_finished()
 352 {
 353   for (size_t current_actor = 1; current_actor < MC_smx_get_maxpid(); current_actor++) {
 354     if (not incomplete_communications_pattern[current_actor].empty()) {
 355       XBT_DEBUG("Some communications are not finished, cannot stop the exploration! State not visited.");
 356       return false;
 357     }
 358   }
 359   return true;
 360 }
 361
 362 void CommunicationDeterminismChecker::restoreState()
 363 {
 364   /* Intermediate backtracking */
 365   simgrid::mc::State* last_state = stack_.back().get();
 366   if (last_state->system_state) {
 367     last_state->system_state->restore(&mc_model_checker->process());
 368     MC_restore_communications_pattern(last_state);
 369     return;
 370   }
 371
 372   /* Restore the initial state */
 373   simgrid::mc::session->restore_initial_state();
 374
 375   unsigned n = MC_smx_get_maxpid();
 376   assert(n == incomplete_communications_pattern.size());
 377   assert(n == initial_communications_pattern.size());
 378   for (unsigned j=0; j < n ; j++) {
 379     incomplete_communications_pattern[j].clear();
 380     initial_communications_pattern[j].index_comm = 0;
 381   }
 382
 383   /* Traverse the stack from the state at position start and re-execute the transitions */
 384   for (std::unique_ptr<simgrid::mc::State> const& state : stack_) {
 385     if (state == stack_.back())
 386       break;
 387
 388     int req_num             = state->transition_.argument_;
 389     smx_simcall_t saved_req = &state->executed_req_;
 390     xbt_assert(saved_req);
 391
 392     /* because we got a copy of the executed request, we have to fetch the
 393        real one, pointed by the request field of the issuer process */
 394
 395     const smx_actor_t issuer = MC_smx_simcall_get_issuer(saved_req);
 396     smx_simcall_t req = &issuer->simcall;
 397
 398     /* TODO : handle test and testany simcalls */
 399     e_mc_call_type_t call = MC_get_call_type(req);
 400     mc_model_checker->handle_simcall(state->transition_);
 401     MC_handle_comm_pattern(call, req, req_num, 1);
 402     mc_model_checker->wait_for_requests();
 403
 404     /* Update statistics */
 405     mc_model_checker->visited_states++;
 406     mc_model_checker->executed_transitions++;
 407   }
 408 }
 409
 410 void CommunicationDeterminismChecker::real_run()
 411 {
 412   std::unique_ptr<simgrid::mc::VisitedState> visited_state = nullptr;
 413   smx_simcall_t req = nullptr;
 414
 415   while (not stack_.empty()) {
 416     /* Get current state */
 417     simgrid::mc::State* cur_state = stack_.back().get();
 418
 419     XBT_DEBUG("**************************************************");
 420     XBT_DEBUG("Exploration depth = %zu (state = %d, interleaved processes = %zu)", stack_.size(), cur_state->num_,
 421               cur_state->interleave_size());
 422
 423     /* Update statistics */
 424     mc_model_checker->visited_states++;
 425
 426     if (stack_.size() <= (std::size_t)_sg_mc_max_depth)
 427       req = MC_state_choose_request(cur_state);
 428     else
 429       req = nullptr;
 430
 431     if (req != nullptr && visited_state == nullptr) {
 432
 433       int req_num = cur_state->transition_.argument_;
 434
 435       XBT_DEBUG("Execute: %s", simgrid::mc::request_to_string(req, req_num, simgrid::mc::RequestType::simix).c_str());
 436
 437       std::string req_str;
 438       if (dot_output != nullptr)
 439         req_str = simgrid::mc::request_get_dot_output(req, req_num);
 440
 441       mc_model_checker->executed_transitions++;
 442
 443       /* TODO : handle test and testany simcalls */
 444       e_mc_call_type_t call = MC_CALL_TYPE_NONE;
 445       if (_sg_mc_comms_determinism || _sg_mc_send_determinism)
 446         call = MC_get_call_type(req);
 447
 448       /* Answer the request */
 449       mc_model_checker->handle_simcall(cur_state->transition_);
 450       /* After this call req is no longer useful */
 451
 452       MC_handle_comm_pattern(call, req, req_num, 0);
 453
 454       /* Wait for requests (schedules processes) */
 455       mc_model_checker->wait_for_requests();
 456
 457       /* Create the new expanded state */
 458       std::unique_ptr<simgrid::mc::State> next_state(new simgrid::mc::State(++expanded_states_count_));
 459
 460       /* If comm determinism verification, we cannot stop the exploration if some communications are not finished (at
 461        * least, data are transferred). These communications  are incomplete and they cannot be analyzed and compared
 462        * with the initial pattern. */
 463       bool compare_snapshots = this->initial_communications_pattern_done && all_communications_are_finished();
 464
 465       if (_sg_mc_max_visited_states != 0)
 466         visited_state = visited_states_.addVisitedState(expanded_states_count_, next_state.get(), compare_snapshots);
 467       else
 468         visited_state = nullptr;
 469
 470       if (visited_state == nullptr) {
 471
 472         /* Get enabled actors and insert them in the interleave set of the next state */
 473         for (auto& actor : mc_model_checker->process().actors())
 474           if (simgrid::mc::actor_is_enabled(actor.copy.get_buffer()))
 475             next_state->add_interleaving_set(actor.copy.get_buffer());
 476
 477         if (dot_output != nullptr)
 478           fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", cur_state->num_, next_state->num_, req_str.c_str());
 479
 480       } else if (dot_output != nullptr)
 481         fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", cur_state->num_,
 482                 visited_state->original_num == -1 ? visited_state->num : visited_state->original_num, req_str.c_str());
 483
 484       stack_.push_back(std::move(next_state));
 485
 486     } else {
 487
 488       if (stack_.size() > (std::size_t) _sg_mc_max_depth)
 489         XBT_WARN("/!\\ Max depth reached! /!\\ ");
 490       else if (visited_state != nullptr)
 491         XBT_DEBUG("State already visited (equal to state %d), exploration stopped on this path.",
 492             visited_state->original_num == -1 ? visited_state->num : visited_state->original_num);
 493       else
 494         XBT_DEBUG("There are no more processes to interleave. (depth %zu)", stack_.size());
 495
 496       this->initial_communications_pattern_done = true;
 497
 498       /* Trash the current state, no longer needed */
 499       XBT_DEBUG("Delete state %d at depth %zu", cur_state->num_, stack_.size());
 500       stack_.pop_back();
 501
 502       visited_state = nullptr;
 503
 504       /* Check for deadlocks */
 505       if (mc_model_checker->checkDeadlock()) {
 506         MC_show_deadlock();
 507         throw simgrid::mc::DeadlockError();
 508       }
 509
 510       while (not stack_.empty()) {
 511         std::unique_ptr<simgrid::mc::State> state(std::move(stack_.back()));
 512         stack_.pop_back();
 513         if (state->interleave_size() && stack_.size() < (std::size_t)_sg_mc_max_depth) {
 514           /* We found a back-tracking point, let's loop */
 515           XBT_DEBUG("Back-tracking to state %d at depth %zu", state->num_, stack_.size() + 1);
 516           stack_.push_back(std::move(state));
 517
 518           this->restoreState();
 519
 520           XBT_DEBUG("Back-tracking to state %d at depth %zu done", stack_.back()->num_, stack_.size());
 521
 522           break;
 523         } else {
 524           XBT_DEBUG("Delete state %d at depth %zu", state->num_, stack_.size() + 1);
 525         }
 526       }
 527     }
 528   }
 529
 530   simgrid::mc::session->log_state();
 531 }
 532
 533 void CommunicationDeterminismChecker::run()
 534 {
 535   XBT_INFO("Check communication determinism");
 536   simgrid::mc::session->initialize();
 537
 538   this->prepare();
 539
 540   this->real_run();
 541 }
 542
 543 Checker* createCommunicationDeterminismChecker(Session& s)
 544 {
 545   return new CommunicationDeterminismChecker(s);
 546 }
 547
 548 }
 549 }