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   simgrid::mc::PatternCommunicationList& list = initial_communications_pattern[process];
 123
 124   if (not backtracking) {
 125     e_mc_comm_pattern_difference_t diff = compare_comm_pattern(list.list[list.index_comm].get(), comm);
 126
 127     if (diff != NONE_DIFF) {
 128       if (comm->type == simgrid::mc::PatternCommunicationType::send) {
 129         this->send_deterministic = 0;
 130         if (this->send_diff != nullptr)
 131           xbt_free(this->send_diff);
 132         this->send_diff = print_determinism_result(diff, process, comm, list.index_comm + 1);
 133       } else {
 134         this->recv_deterministic = 0;
 135         if (this->recv_diff != nullptr)
 136           xbt_free(this->recv_diff);
 137         this->recv_diff = print_determinism_result(diff, process, comm, list.index_comm + 1);
 138       }
 139       if (_sg_mc_send_determinism && not this->send_deterministic) {
 140         XBT_INFO("*********************************************************");
 141         XBT_INFO("***** Non-send-deterministic communications pattern *****");
 142         XBT_INFO("*********************************************************");
 143         XBT_INFO("%s", this->send_diff);
 144         xbt_free(this->send_diff);
 145         this->send_diff = nullptr;
 146         simgrid::mc::session->log_state();
 147         mc_model_checker->exit(SIMGRID_MC_EXIT_NON_DETERMINISM);
 148       } else if (_sg_mc_comms_determinism && (not this->send_deterministic && not this->recv_deterministic)) {
 149         XBT_INFO("****************************************************");
 150         XBT_INFO("***** Non-deterministic communications pattern *****");
 151         XBT_INFO("****************************************************");
 152         if (this->send_diff) {
 153           XBT_INFO("%s", this->send_diff);
 154           xbt_free(this->send_diff);
 155           this->send_diff = nullptr;
 156         }
 157         if (this->recv_diff) {
 158           XBT_INFO("%s", this->recv_diff);
 159           xbt_free(this->recv_diff);
 160           this->recv_diff = nullptr;
 161         }
 162         simgrid::mc::session->log_state();
 163         mc_model_checker->exit(SIMGRID_MC_EXIT_NON_DETERMINISM);
 164       }
 165     }
 166   }
 167 }
 168
 169 /********** Non Static functions ***********/
 170
 171 void CommunicationDeterminismChecker::get_comm_pattern(smx_simcall_t request, e_mc_call_type_t call_type,
 172                                                        int backtracking)
 173 {
 174   const smx_actor_t issuer = MC_smx_simcall_get_issuer(request);
 175   const simgrid::mc::PatternCommunicationList& initial_pattern = initial_communications_pattern[issuer->get_pid()];
 176   const std::vector<simgrid::mc::PatternCommunication*>& incomplete_pattern =
 177       incomplete_communications_pattern[issuer->get_pid()];
 178
 179   std::unique_ptr<simgrid::mc::PatternCommunication> pattern(new simgrid::mc::PatternCommunication());
 180   pattern->index = initial_pattern.index_comm + incomplete_pattern.size();
 181
 182   if (call_type == MC_CALL_TYPE_SEND) {
 183     /* Create comm pattern */
 184     pattern->type = simgrid::mc::PatternCommunicationType::send;
 185     pattern->comm_addr = static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_isend__getraw__result(request));
 186
 187     simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_synchro;
 188     mc_model_checker->process().read(temp_synchro,
 189                                      remote(static_cast<simgrid::kernel::activity::CommImpl*>(pattern->comm_addr)));
 190     simgrid::kernel::activity::CommImpl* synchro =
 191         static_cast<simgrid::kernel::activity::CommImpl*>(temp_synchro.get_buffer());
 192
 193     char* remote_name = mc_model_checker->process().read<char*>(RemotePtr<char*>(
 194         (uint64_t)(synchro->get_mailbox() ? &synchro->get_mailbox()->name_ : &synchro->mbox_cpy->name_)));
 195     pattern->rdv      = mc_model_checker->process().read_string(RemotePtr<char>(remote_name));
 196     pattern->src_proc =
 197         mc_model_checker->process().resolve_actor(simgrid::mc::remote(synchro->src_actor_.get()))->get_pid();
 198     pattern->src_host = MC_smx_actor_get_host_name(issuer);
 199
 200 #if HAVE_SMPI
 201     simgrid::smpi::Request mpi_request;
 202     mc_model_checker->process().read(
 203         &mpi_request, remote(static_cast<simgrid::smpi::Request*>(simcall_comm_isend__get__data(request))));
 204     pattern->tag = mpi_request.tag();
 205 #endif
 206
 207     if (synchro->src_buff_ != nullptr) {
 208       pattern->data.resize(synchro->src_buff_size_);
 209       mc_model_checker->process().read_bytes(pattern->data.data(), pattern->data.size(), remote(synchro->src_buff_));
 210     }
 211 #if HAVE_SMPI
 212     if(mpi_request.detached()){
 213       if (this->initial_communications_pattern_done) {
 214         /* Evaluate comm determinism */
 215         this->deterministic_comm_pattern(pattern->src_proc, pattern.get(), backtracking);
 216         initial_communications_pattern[pattern->src_proc].index_comm++;
 217       } else {
 218         /* Store comm pattern */
 219         initial_communications_pattern[pattern->src_proc].list.push_back(std::move(pattern));
 220       }
 221       return;
 222     }
 223 #endif
 224   } else if (call_type == MC_CALL_TYPE_RECV) {
 225     pattern->type = simgrid::mc::PatternCommunicationType::receive;
 226     pattern->comm_addr = static_cast<simgrid::kernel::activity::CommImpl*>(simcall_comm_irecv__getraw__result(request));
 227
 228 #if HAVE_SMPI
 229     simgrid::smpi::Request mpi_request;
 230     mc_model_checker->process().read(
 231         &mpi_request, remote(static_cast<simgrid::smpi::Request*>(simcall_comm_irecv__get__data(request))));
 232     pattern->tag = mpi_request.tag();
 233 #endif
 234
 235     simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
 236     mc_model_checker->process().read(temp_comm,
 237                                      remote(static_cast<simgrid::kernel::activity::CommImpl*>(pattern->comm_addr)));
 238     simgrid::kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 239
 240     char* remote_name;
 241     mc_model_checker->process().read(&remote_name,
 242                                      remote(comm->get_mailbox()
 243                                                 ? &simgrid::xbt::string::to_string_data(comm->get_mailbox()->name_).data
 244                                                 : &simgrid::xbt::string::to_string_data(comm->mbox_cpy->name_).data));
 245     pattern->rdv      = mc_model_checker->process().read_string(RemotePtr<char>(remote_name));
 246     pattern->dst_proc =
 247         mc_model_checker->process().resolve_actor(simgrid::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(
 257     simgrid::mc::RemotePtr<simgrid::kernel::activity::CommImpl> comm_addr, unsigned int issuer, int backtracking)
 258 {
 259   /* Complete comm pattern */
 260   std::vector<simgrid::mc::PatternCommunication*>& incomplete_pattern = incomplete_communications_pattern[issuer];
 261   auto current_comm_pattern = std::find_if(
 262       begin(incomplete_pattern), end(incomplete_pattern),
 263       [&comm_addr](simgrid::mc::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<simgrid::mc::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(
 304           simgrid::mc::request_to_string(req, state->transition_.argument_, simgrid::mc::RequestType::executed));
 305   }
 306   return trace;
 307 }
 308
 309 void CommunicationDeterminismChecker::log_state() // override
 310 {
 311   if (_sg_mc_comms_determinism) {
 312     if (this->send_deterministic && not this->recv_deterministic) {
 313       XBT_INFO("*******************************************************");
 314       XBT_INFO("**** Only-send-deterministic communication pattern ****");
 315       XBT_INFO("*******************************************************");
 316       XBT_INFO("%s", this->recv_diff);
 317     }
 318     if (not this->send_deterministic && this->recv_deterministic) {
 319       XBT_INFO("*******************************************************");
 320       XBT_INFO("**** Only-recv-deterministic communication pattern ****");
 321       XBT_INFO("*******************************************************");
 322       XBT_INFO("%s", this->send_diff);
 323     }
 324   }
 325   XBT_INFO("Expanded states = %lu", expanded_states_count_);
 326   XBT_INFO("Visited states = %lu", mc_model_checker->visited_states);
 327   XBT_INFO("Executed transitions = %lu", mc_model_checker->executed_transitions);
 328   XBT_INFO("Send-deterministic : %s", this->send_deterministic ? "Yes" : "No");
 329   if (_sg_mc_comms_determinism)
 330     XBT_INFO("Recv-deterministic : %s", this->recv_deterministic ? "Yes" : "No");
 331 }
 332
 333 void CommunicationDeterminismChecker::prepare()
 334 {
 335   const int maxpid = MC_smx_get_maxpid();
 336
 337   initial_communications_pattern.resize(maxpid);
 338   incomplete_communications_pattern.resize(maxpid);
 339
 340   std::unique_ptr<simgrid::mc::State> initial_state(new simgrid::mc::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   for (auto& actor : mc_model_checker->process().actors())
 346     if (simgrid::mc::actor_is_enabled(actor.copy.get_buffer()))
 347       initial_state->add_interleaving_set(actor.copy.get_buffer());
 348
 349   stack_.push_back(std::move(initial_state));
 350 }
 351
 352 static inline bool all_communications_are_finished()
 353 {
 354   for (size_t current_actor = 1; current_actor < MC_smx_get_maxpid(); current_actor++) {
 355     if (not incomplete_communications_pattern[current_actor].empty()) {
 356       XBT_DEBUG("Some communications are not finished, cannot stop the exploration! State not visited.");
 357       return false;
 358     }
 359   }
 360   return true;
 361 }
 362
 363 void CommunicationDeterminismChecker::restoreState()
 364 {
 365   /* Intermediate backtracking */
 366   simgrid::mc::State* last_state = stack_.back().get();
 367   if (last_state->system_state) {
 368     last_state->system_state->restore(&mc_model_checker->process());
 369     MC_restore_communications_pattern(last_state);
 370     return;
 371   }
 372
 373   /* Restore the initial state */
 374   simgrid::mc::session->restore_initial_state();
 375
 376   unsigned n = MC_smx_get_maxpid();
 377   assert(n == incomplete_communications_pattern.size());
 378   assert(n == initial_communications_pattern.size());
 379   for (unsigned j=0; j < n ; j++) {
 380     incomplete_communications_pattern[j].clear();
 381     initial_communications_pattern[j].index_comm = 0;
 382   }
 383
 384   /* Traverse the stack from the state at position start and re-execute the transitions */
 385   for (std::unique_ptr<simgrid::mc::State> const& state : stack_) {
 386     if (state == stack_.back())
 387       break;
 388
 389     int req_num             = state->transition_.argument_;
 390     smx_simcall_t saved_req = &state->executed_req_;
 391     xbt_assert(saved_req);
 392
 393     /* because we got a copy of the executed request, we have to fetch the
 394        real one, pointed by the request field of the issuer process */
 395
 396     const smx_actor_t issuer = MC_smx_simcall_get_issuer(saved_req);
 397     smx_simcall_t req = &issuer->simcall;
 398
 399     /* TODO : handle test and testany simcalls */
 400     e_mc_call_type_t call = MC_get_call_type(req);
 401     mc_model_checker->handle_simcall(state->transition_);
 402     MC_handle_comm_pattern(call, req, req_num, 1);
 403     mc_model_checker->wait_for_requests();
 404
 405     /* Update statistics */
 406     mc_model_checker->visited_states++;
 407     mc_model_checker->executed_transitions++;
 408   }
 409 }
 410
 411 void CommunicationDeterminismChecker::real_run()
 412 {
 413   std::unique_ptr<simgrid::mc::VisitedState> visited_state = nullptr;
 414   smx_simcall_t req = nullptr;
 415
 416   while (not stack_.empty()) {
 417     /* Get current state */
 418     simgrid::mc::State* cur_state = stack_.back().get();
 419
 420     XBT_DEBUG("**************************************************");
 421     XBT_DEBUG("Exploration depth = %zu (state = %d, interleaved processes = %zu)", stack_.size(), cur_state->num_,
 422               cur_state->interleave_size());
 423
 424     /* Update statistics */
 425     mc_model_checker->visited_states++;
 426
 427     if (stack_.size() <= (std::size_t)_sg_mc_max_depth)
 428       req = MC_state_get_request(cur_state);
 429     else
 430       req = nullptr;
 431
 432     if (req != nullptr && visited_state == nullptr) {
 433
 434       int req_num = cur_state->transition_.argument_;
 435
 436       XBT_DEBUG("Execute: %s", simgrid::mc::request_to_string(req, req_num, simgrid::mc::RequestType::simix).c_str());
 437
 438       std::string req_str;
 439       if (dot_output != nullptr)
 440         req_str = simgrid::mc::request_get_dot_output(req, req_num);
 441
 442       mc_model_checker->executed_transitions++;
 443
 444       /* TODO : handle test and testany simcalls */
 445       e_mc_call_type_t call = MC_CALL_TYPE_NONE;
 446       if (_sg_mc_comms_determinism || _sg_mc_send_determinism)
 447         call = MC_get_call_type(req);
 448
 449       /* Answer the request */
 450       mc_model_checker->handle_simcall(cur_state->transition_);
 451       /* After this call req is no longer useful */
 452
 453       MC_handle_comm_pattern(call, req, req_num, 0);
 454
 455       /* Wait for requests (schedules processes) */
 456       mc_model_checker->wait_for_requests();
 457
 458       /* Create the new expanded state */
 459       std::unique_ptr<simgrid::mc::State> next_state(new simgrid::mc::State(++expanded_states_count_));
 460
 461       /* If comm determinism verification, we cannot stop the exploration if some communications are not finished (at
 462        * least, data are transferred). These communications  are incomplete and they cannot be analyzed and compared
 463        * with the initial pattern. */
 464       bool compare_snapshots = this->initial_communications_pattern_done && all_communications_are_finished();
 465
 466       if (_sg_mc_max_visited_states != 0)
 467         visited_state = visited_states_.addVisitedState(expanded_states_count_, next_state.get(), compare_snapshots);
 468       else
 469         visited_state = nullptr;
 470
 471       if (visited_state == nullptr) {
 472
 473         /* Get enabled actors and insert them in the interleave set of the next state */
 474         for (auto& actor : mc_model_checker->process().actors())
 475           if (simgrid::mc::actor_is_enabled(actor.copy.get_buffer()))
 476             next_state->add_interleaving_set(actor.copy.get_buffer());
 477
 478         if (dot_output != nullptr)
 479           fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", cur_state->num_, next_state->num_, req_str.c_str());
 480
 481       } else if (dot_output != nullptr)
 482         fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", cur_state->num_,
 483                 visited_state->original_num == -1 ? visited_state->num : visited_state->original_num, req_str.c_str());
 484
 485       stack_.push_back(std::move(next_state));
 486
 487     } else {
 488
 489       if (stack_.size() > (std::size_t) _sg_mc_max_depth)
 490         XBT_WARN("/!\\ Max depth reached! /!\\ ");
 491       else if (visited_state != nullptr)
 492         XBT_DEBUG("State already visited (equal to state %d), exploration stopped on this path.",
 493             visited_state->original_num == -1 ? visited_state->num : visited_state->original_num);
 494       else
 495         XBT_DEBUG("There are no more processes to interleave. (depth %zu)", stack_.size());
 496
 497       this->initial_communications_pattern_done = true;
 498
 499       /* Trash the current state, no longer needed */
 500       XBT_DEBUG("Delete state %d at depth %zu", cur_state->num_, stack_.size());
 501       stack_.pop_back();
 502
 503       visited_state = nullptr;
 504
 505       /* Check for deadlocks */
 506       if (mc_model_checker->checkDeadlock()) {
 507         MC_show_deadlock();
 508         throw simgrid::mc::DeadlockError();
 509       }
 510
 511       while (not stack_.empty()) {
 512         std::unique_ptr<simgrid::mc::State> state(std::move(stack_.back()));
 513         stack_.pop_back();
 514         if (state->interleave_size() && stack_.size() < (std::size_t)_sg_mc_max_depth) {
 515           /* We found a back-tracking point, let's loop */
 516           XBT_DEBUG("Back-tracking to state %d at depth %zu", state->num_, stack_.size() + 1);
 517           stack_.push_back(std::move(state));
 518
 519           this->restoreState();
 520
 521           XBT_DEBUG("Back-tracking to state %d at depth %zu done", stack_.back()->num_, stack_.size());
 522
 523           break;
 524         } else {
 525           XBT_DEBUG("Delete state %d at depth %zu", state->num_, stack_.size() + 1);
 526         }
 527       }
 528     }
 529   }
 530
 531   simgrid::mc::session->log_state();
 532 }
 533
 534 void CommunicationDeterminismChecker::run()
 535 {
 536   XBT_INFO("Check communication determinism");
 537   simgrid::mc::session->initialize();
 538
 539   this->prepare();
 540
 541   this->real_run();
 542 }
 543
 544 Checker* createCommunicationDeterminismChecker(Session& s)
 545 {
 546   return new CommunicationDeterminismChecker(s);
 547 }
 548
 549 }
 550 }