1 /* Copyright (c) 2008-2020. The SimGrid Team. All rights reserved. */
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. */
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"
16 #include "smpi_request.hpp"
21 using simgrid::mc::remote;
23 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_comm_determinism, mc, "Logging specific to MC communication determinism detection");
25 /********** Global variables **********/
27 std::vector<simgrid::mc::PatternCommunicationList> initial_communications_pattern;
28 std::vector<std::vector<simgrid::mc::PatternCommunication*>> incomplete_communications_pattern;
30 /********** Static functions ***********/
32 static simgrid::mc::CommPatternDifference compare_comm_pattern(const simgrid::mc::PatternCommunication* comm1,
33 const simgrid::mc::PatternCommunication* comm2)
35 using simgrid::mc::CommPatternDifference;
36 if(comm1->type != comm2->type)
37 return CommPatternDifference::TYPE;
38 if (comm1->rdv != comm2->rdv)
39 return CommPatternDifference::RDV;
40 if (comm1->src_proc != comm2->src_proc)
41 return CommPatternDifference::SRC_PROC;
42 if (comm1->dst_proc != comm2->dst_proc)
43 return CommPatternDifference::DST_PROC;
44 if (comm1->tag != comm2->tag)
45 return CommPatternDifference::TAG;
46 if (comm1->data.size() != comm2->data.size())
47 return CommPatternDifference::DATA_SIZE;
48 if (comm1->data != comm2->data)
49 return CommPatternDifference::DATA;
50 return CommPatternDifference::NONE;
53 static char* print_determinism_result(simgrid::mc::CommPatternDifference diff, int process,
54 const simgrid::mc::PatternCommunication* comm, unsigned int cursor)
59 if (comm->type == simgrid::mc::PatternCommunicationType::send)
60 type = bprintf("The send communications pattern of the process %d is different!", process - 1);
62 type = bprintf("The recv communications pattern of the process %d is different!", process - 1);
64 using simgrid::mc::CommPatternDifference;
66 case CommPatternDifference::TYPE:
67 res = bprintf("%s Different type for communication #%u", type, cursor);
69 case CommPatternDifference::RDV:
70 res = bprintf("%s Different rdv for communication #%u", type, cursor);
72 case CommPatternDifference::TAG:
73 res = bprintf("%s Different tag for communication #%u", type, cursor);
75 case CommPatternDifference::SRC_PROC:
76 res = bprintf("%s Different source for communication #%u", type, cursor);
78 case CommPatternDifference::DST_PROC:
79 res = bprintf("%s Different destination for communication #%u", type, cursor);
81 case CommPatternDifference::DATA_SIZE:
82 res = bprintf("%s Different data size for communication #%u", type, cursor);
84 case CommPatternDifference::DATA:
85 res = bprintf("%s Different data for communication #%u", type, cursor);
95 static void update_comm_pattern(simgrid::mc::PatternCommunication* comm_pattern,
96 simgrid::mc::RemotePtr<simgrid::kernel::activity::CommImpl> comm_addr)
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();
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) {
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_));
123 void CommunicationDeterminismChecker::deterministic_comm_pattern(int process, const PatternCommunication* comm,
126 if (not backtracking) {
127 PatternCommunicationList& list = initial_communications_pattern[process];
128 CommPatternDifference diff = compare_comm_pattern(list.list[list.index_comm].get(), comm);
130 if (diff != CommPatternDifference::NONE) {
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);
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);
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;
160 if (this->recv_diff) {
161 XBT_INFO("%s", this->recv_diff);
162 xbt_free(this->recv_diff);
163 this->recv_diff = nullptr;
165 mc::session->log_state();
166 mc_model_checker->exit(SIMGRID_MC_EXIT_NON_DETERMINISM);
172 /********** Non Static functions ***********/
174 void CommunicationDeterminismChecker::get_comm_pattern(smx_simcall_t request, CallType call_type, int backtracking)
176 const smx_actor_t issuer = MC_smx_simcall_get_issuer(request);
177 const mc::PatternCommunicationList& initial_pattern = initial_communications_pattern[issuer->get_pid()];
178 const std::vector<PatternCommunication*>& incomplete_pattern = incomplete_communications_pattern[issuer->get_pid()];
180 auto pattern = std::make_unique<PatternCommunication>();
181 pattern->index = initial_pattern.index_comm + incomplete_pattern.size();
183 if (call_type == CallType::SEND) {
184 /* Create comm pattern */
185 pattern->type = PatternCommunicationType::send;
186 pattern->comm_addr = static_cast<kernel::activity::CommImpl*>(simcall_comm_isend__getraw__result(request));
188 Remote<kernel::activity::CommImpl> temp_synchro;
189 mc_model_checker->get_remote_simulation().read(temp_synchro, remote(pattern->comm_addr));
190 const kernel::activity::CommImpl* synchro = temp_synchro.get_buffer();
192 char* remote_name = mc_model_checker->get_remote_simulation().read<char*>(RemotePtr<char*>(
193 (uint64_t)(synchro->get_mailbox() ? &synchro->get_mailbox()->name_ : &synchro->mbox_cpy->name_)));
194 pattern->rdv = mc_model_checker->get_remote_simulation().read_string(RemotePtr<char>(remote_name));
196 mc_model_checker->get_remote_simulation().resolve_actor(mc::remote(synchro->src_actor_.get()))->get_pid();
197 pattern->src_host = MC_smx_actor_get_host_name(issuer);
200 simgrid::smpi::Request mpi_request;
201 mc_model_checker->get_remote_simulation().read(
202 &mpi_request, remote(static_cast<smpi::Request*>(simcall_comm_isend__get__data(request))));
203 pattern->tag = mpi_request.tag();
206 if (synchro->src_buff_ != nullptr) {
207 pattern->data.resize(synchro->src_buff_size_);
208 mc_model_checker->get_remote_simulation().read_bytes(pattern->data.data(), pattern->data.size(),
209 remote(synchro->src_buff_));
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++;
218 /* Store comm pattern */
219 initial_communications_pattern[pattern->src_proc].list.push_back(std::move(pattern));
224 } else if (call_type == CallType::RECV) {
225 pattern->type = PatternCommunicationType::receive;
226 pattern->comm_addr = static_cast<kernel::activity::CommImpl*>(simcall_comm_irecv__getraw__result(request));
229 smpi::Request mpi_request;
230 mc_model_checker->get_remote_simulation().read(
231 &mpi_request, remote(static_cast<smpi::Request*>(simcall_comm_irecv__get__data(request))));
232 pattern->tag = mpi_request.tag();
235 Remote<kernel::activity::CommImpl> temp_comm;
236 mc_model_checker->get_remote_simulation().read(temp_comm, remote(pattern->comm_addr));
237 const kernel::activity::CommImpl* comm = temp_comm.get_buffer();
240 mc_model_checker->get_remote_simulation().read(
241 &remote_name, remote(comm->get_mailbox() ? &xbt::string::to_string_data(comm->get_mailbox()->name_).data
242 : &xbt::string::to_string_data(comm->mbox_cpy->name_).data));
243 pattern->rdv = mc_model_checker->get_remote_simulation().read_string(RemotePtr<char>(remote_name));
245 mc_model_checker->get_remote_simulation().resolve_actor(mc::remote(comm->dst_actor_.get()))->get_pid();
246 pattern->dst_host = MC_smx_actor_get_host_name(issuer);
248 xbt_die("Unexpected call_type %i", (int) call_type);
250 XBT_DEBUG("Insert incomplete comm pattern %p for process %ld", pattern.get(), issuer->get_pid());
251 incomplete_communications_pattern[issuer->get_pid()].push_back(pattern.release());
254 void CommunicationDeterminismChecker::complete_comm_pattern(RemotePtr<kernel::activity::CommImpl> comm_addr,
255 unsigned int issuer, int backtracking)
257 /* Complete comm pattern */
258 std::vector<PatternCommunication*>& incomplete_pattern = incomplete_communications_pattern[issuer];
259 auto current_comm_pattern =
260 std::find_if(begin(incomplete_pattern), end(incomplete_pattern),
261 [&comm_addr](const PatternCommunication* comm) { return remote(comm->comm_addr) == comm_addr; });
262 if (current_comm_pattern == std::end(incomplete_pattern))
263 xbt_die("Corresponding communication not found!");
265 update_comm_pattern(*current_comm_pattern, comm_addr);
266 std::unique_ptr<PatternCommunication> comm_pattern(*current_comm_pattern);
267 XBT_DEBUG("Remove incomplete comm pattern for process %u at cursor %zd", issuer,
268 std::distance(begin(incomplete_pattern), current_comm_pattern));
269 incomplete_pattern.erase(current_comm_pattern);
271 if (this->initial_communications_pattern_done) {
272 /* Evaluate comm determinism */
273 this->deterministic_comm_pattern(issuer, comm_pattern.get(), backtracking);
274 initial_communications_pattern[issuer].index_comm++;
276 /* Store comm pattern */
277 initial_communications_pattern[issuer].list.push_back(std::move(comm_pattern));
281 CommunicationDeterminismChecker::CommunicationDeterminismChecker(Session& s) : Checker(s)
285 CommunicationDeterminismChecker::~CommunicationDeterminismChecker() = default;
287 RecordTrace CommunicationDeterminismChecker::get_record_trace() // override
290 for (auto const& state : stack_)
291 res.push_back(state->get_transition());
295 std::vector<std::string> CommunicationDeterminismChecker::get_textual_trace() // override
297 std::vector<std::string> trace;
298 for (auto const& state : stack_) {
299 smx_simcall_t req = &state->executed_req_;
301 trace.push_back(request_to_string(req, state->transition_.argument_, RequestType::executed));
306 void CommunicationDeterminismChecker::log_state() // override
308 if (_sg_mc_comms_determinism) {
309 if (this->send_deterministic && not this->recv_deterministic) {
310 XBT_INFO("*******************************************************");
311 XBT_INFO("**** Only-send-deterministic communication pattern ****");
312 XBT_INFO("*******************************************************");
313 XBT_INFO("%s", this->recv_diff);
315 if (not this->send_deterministic && this->recv_deterministic) {
316 XBT_INFO("*******************************************************");
317 XBT_INFO("**** Only-recv-deterministic communication pattern ****");
318 XBT_INFO("*******************************************************");
319 XBT_INFO("%s", this->send_diff);
322 XBT_INFO("Expanded states = %lu", expanded_states_count_);
323 XBT_INFO("Visited states = %lu", mc_model_checker->visited_states);
324 XBT_INFO("Executed transitions = %lu", mc_model_checker->executed_transitions);
325 XBT_INFO("Send-deterministic : %s", this->send_deterministic ? "Yes" : "No");
326 if (_sg_mc_comms_determinism)
327 XBT_INFO("Recv-deterministic : %s", this->recv_deterministic ? "Yes" : "No");
330 void CommunicationDeterminismChecker::prepare()
332 const int maxpid = MC_smx_get_maxpid();
334 initial_communications_pattern.resize(maxpid);
335 incomplete_communications_pattern.resize(maxpid);
337 ++expanded_states_count_;
338 auto initial_state = std::make_unique<State>(expanded_states_count_);
340 XBT_DEBUG("********* Start communication determinism verification *********");
342 /* Get an enabled actor and insert it in the interleave set of the initial state */
343 for (auto& actor : mc_model_checker->get_remote_simulation().actors())
344 if (mc::actor_is_enabled(actor.copy.get_buffer()))
345 initial_state->add_interleaving_set(actor.copy.get_buffer());
347 stack_.push_back(std::move(initial_state));
350 static inline bool all_communications_are_finished()
352 for (size_t current_actor = 1; current_actor < MC_smx_get_maxpid(); current_actor++) {
353 if (not incomplete_communications_pattern[current_actor].empty()) {
354 XBT_DEBUG("Some communications are not finished, cannot stop the exploration! State not visited.");
361 void CommunicationDeterminismChecker::restoreState()
363 /* Intermediate backtracking */
364 State* last_state = stack_.back().get();
365 if (last_state->system_state_) {
366 last_state->system_state_->restore(&mc_model_checker->get_remote_simulation());
367 MC_restore_communications_pattern(last_state);
371 /* Restore the initial state */
372 mc::session->restore_initial_state();
374 unsigned n = MC_smx_get_maxpid();
375 assert(n == incomplete_communications_pattern.size());
376 assert(n == initial_communications_pattern.size());
377 for (unsigned j=0; j < n ; j++) {
378 incomplete_communications_pattern[j].clear();
379 initial_communications_pattern[j].index_comm = 0;
382 /* Traverse the stack from the state at position start and re-execute the transitions */
383 for (std::unique_ptr<simgrid::mc::State> const& state : stack_) {
384 if (state == stack_.back())
387 int req_num = state->transition_.argument_;
388 const s_smx_simcall* saved_req = &state->executed_req_;
389 xbt_assert(saved_req);
391 /* because we got a copy of the executed request, we have to fetch the
392 real one, pointed by the request field of the issuer process */
394 const smx_actor_t issuer = MC_smx_simcall_get_issuer(saved_req);
395 smx_simcall_t req = &issuer->simcall_;
397 /* TODO : handle test and testany simcalls */
398 CallType call = MC_get_call_type(req);
399 mc_model_checker->handle_simcall(state->transition_);
400 MC_handle_comm_pattern(call, req, req_num, 1);
401 mc_model_checker->wait_for_requests();
403 /* Update statistics */
404 mc_model_checker->visited_states++;
405 mc_model_checker->executed_transitions++;
409 void CommunicationDeterminismChecker::real_run()
411 std::unique_ptr<VisitedState> visited_state = nullptr;
412 smx_simcall_t req = nullptr;
414 while (not stack_.empty()) {
415 /* Get current state */
416 State* cur_state = stack_.back().get();
418 XBT_DEBUG("**************************************************");
419 XBT_DEBUG("Exploration depth = %zu (state = %d, interleaved processes = %zu)", stack_.size(), cur_state->num_,
420 cur_state->interleave_size());
422 /* Update statistics */
423 mc_model_checker->visited_states++;
425 if (stack_.size() <= (std::size_t)_sg_mc_max_depth)
426 req = MC_state_choose_request(cur_state);
430 if (req != nullptr && visited_state == nullptr) {
431 int req_num = cur_state->transition_.argument_;
433 XBT_DEBUG("Execute: %s", request_to_string(req, req_num, RequestType::simix).c_str());
436 if (dot_output != nullptr)
437 req_str = request_get_dot_output(req, req_num);
439 mc_model_checker->executed_transitions++;
441 /* TODO : handle test and testany simcalls */
442 CallType call = CallType::NONE;
443 if (_sg_mc_comms_determinism || _sg_mc_send_determinism)
444 call = MC_get_call_type(req);
446 /* Answer the request */
447 mc_model_checker->handle_simcall(cur_state->transition_);
448 /* After this call req is no longer useful */
450 MC_handle_comm_pattern(call, req, req_num, 0);
452 /* Wait for requests (schedules processes) */
453 mc_model_checker->wait_for_requests();
455 /* Create the new expanded state */
456 ++expanded_states_count_;
457 auto next_state = std::make_unique<State>(expanded_states_count_);
459 /* If comm determinism verification, we cannot stop the exploration if some communications are not finished (at
460 * least, data are transferred). These communications are incomplete and they cannot be analyzed and compared
461 * with the initial pattern. */
462 bool compare_snapshots = this->initial_communications_pattern_done && all_communications_are_finished();
464 if (_sg_mc_max_visited_states != 0)
465 visited_state = visited_states_.addVisitedState(expanded_states_count_, next_state.get(), compare_snapshots);
467 visited_state = nullptr;
469 if (visited_state == nullptr) {
470 /* Get enabled actors and insert them in the interleave set of the next state */
471 for (auto& actor : mc_model_checker->get_remote_simulation().actors())
472 if (simgrid::mc::actor_is_enabled(actor.copy.get_buffer()))
473 next_state->add_interleaving_set(actor.copy.get_buffer());
475 if (dot_output != nullptr)
476 fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", cur_state->num_, next_state->num_, req_str.c_str());
478 } else if (dot_output != nullptr)
479 fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n", cur_state->num_,
480 visited_state->original_num == -1 ? visited_state->num : visited_state->original_num, req_str.c_str());
482 stack_.push_back(std::move(next_state));
484 if (stack_.size() > (std::size_t) _sg_mc_max_depth)
485 XBT_WARN("/!\\ Max depth reached! /!\\ ");
486 else if (visited_state != nullptr)
487 XBT_DEBUG("State already visited (equal to state %d), exploration stopped on this path.",
488 visited_state->original_num == -1 ? visited_state->num : visited_state->original_num);
490 XBT_DEBUG("There are no more processes to interleave. (depth %zu)", stack_.size());
492 this->initial_communications_pattern_done = true;
494 /* Trash the current state, no longer needed */
495 XBT_DEBUG("Delete state %d at depth %zu", cur_state->num_, stack_.size());
498 visited_state = nullptr;
500 /* Check for deadlocks */
501 if (mc_model_checker->checkDeadlock()) {
503 throw simgrid::mc::DeadlockError();
506 while (not stack_.empty()) {
507 std::unique_ptr<State> state(std::move(stack_.back()));
509 if (state->interleave_size() && stack_.size() < (std::size_t)_sg_mc_max_depth) {
510 /* We found a back-tracking point, let's loop */
511 XBT_DEBUG("Back-tracking to state %d at depth %zu", state->num_, stack_.size() + 1);
512 stack_.push_back(std::move(state));
514 this->restoreState();
516 XBT_DEBUG("Back-tracking to state %d at depth %zu done", stack_.back()->num_, stack_.size());
520 XBT_DEBUG("Delete state %d at depth %zu", state->num_, stack_.size() + 1);
526 mc::session->log_state();
529 void CommunicationDeterminismChecker::run()
531 XBT_INFO("Check communication determinism");
532 mc::session->initialize();
538 Checker* createCommunicationDeterminismChecker(Session& s)
540 return new CommunicationDeterminismChecker(s);
544 } // namespace simgrid