+
+void EngineImpl::load_deployment(const std::string& file) const
+{
+ sg_platf_exit();
+ sg_platf_init();
+
+ surf_parse_open(file);
+ surf_parse();
+ surf_parse_close();
+}
+
+void EngineImpl::register_function(const std::string& name, const actor::ActorCodeFactory& code)
+{
+ registered_functions[name] = code;
+}
+void EngineImpl::register_default(const actor::ActorCodeFactory& code)
+{
+ default_function = code;
+}
+
+void EngineImpl::add_model(std::shared_ptr<resource::Model> model, const std::vector<resource::Model*>& dependencies)
+{
+ auto model_name = model->get_name();
+ xbt_assert(models_prio_.find(model_name) == models_prio_.end(),
+ "Model %s already exists, use model.set_name() to change its name", model_name.c_str());
+
+ for (const auto* dep : dependencies) {
+ xbt_assert(models_prio_.find(dep->get_name()) != models_prio_.end(),
+ "Model %s doesn't exists. Impossible to use it as dependency.", dep->get_name().c_str());
+ }
+ models_.push_back(model.get());
+ models_prio_[model_name] = std::move(model);
+}
+
+/** Wake up all actors waiting for a Surf action to finish */
+void EngineImpl::handle_ended_actions() const
+{
+ for (auto const& model : models_) {
+ XBT_DEBUG("Handling the failed actions (if any)");
+ while (auto* action = model->extract_failed_action()) {
+ XBT_DEBUG(" Handling Action %p", action);
+ if (action->get_activity() != nullptr) { // Skip vcpu actions
+ // Action failures are not automatically reported when the action is started by maestro (as in SimDAG)
+ if (action->get_activity()->get_actor() == maestro_)
+ action->get_activity()->get_iface()->complete(s4u::Activity::State::FAILED);
+
+ activity::ActivityImplPtr(action->get_activity())->post();
+ }
+ }
+ XBT_DEBUG("Handling the terminated actions (if any)");
+ while (auto* action = model->extract_done_action()) {
+ XBT_DEBUG(" Handling Action %p", action);
+ if (action->get_activity() != nullptr) {
+ // Action termination are not automatically reported when the action is started by maestro (as in SimDAG)
+ action->get_activity()->set_finish_time(action->get_finish_time());
+
+ if (action->get_activity()->get_actor() == maestro_)
+ action->get_activity()->get_iface()->complete(s4u::Activity::State::FINISHED);
+
+ activity::ActivityImplPtr(action->get_activity())->post();
+ }
+ }
+ }
+}
+/**
+ * @brief Executes the actors in actors_to_run.
+ *
+ * The actors in actors_to_run are run (in parallel if possible). On exit, actors_to_run is empty, and actors_that_ran
+ * contains the list of actors that just ran. The two lists are swapped so, be careful when using them before and after
+ * a call to this function.
+ */
+void EngineImpl::run_all_actors()
+{
+ instance_->get_context_factory()->run_all(actors_to_run_);
+
+ for (auto const& actor : actors_to_run_)
+ if (actor->to_be_freed())
+ actor->cleanup_from_kernel();
+
+ actors_to_run_.swap(actors_that_ran_);
+ actors_to_run_.clear();
+}
+
+actor::ActorImpl* EngineImpl::get_actor_by_pid(aid_t pid)
+{
+ auto item = actor_list_.find(pid);
+ return item == actor_list_.end() ? nullptr : item->second;
+}
+
+void EngineImpl::remove_daemon(actor::ActorImpl* actor)
+{
+ auto it = daemons_.find(actor);
+ xbt_assert(it != daemons_.end(), "The dying daemon is not a daemon after all. Please report that bug.");
+ daemons_.erase(it);
+}
+
+void EngineImpl::add_actor_to_run_list_no_check(actor::ActorImpl* actor)
+{
+ XBT_DEBUG("Inserting [%p] %s(%s) in the to_run list", actor, actor->get_cname(), actor->get_host()->get_cname());
+ actors_to_run_.push_back(actor);
+}
+
+void EngineImpl::add_actor_to_run_list(actor::ActorImpl* actor)
+{
+ if (std::find(begin(actors_to_run_), end(actors_to_run_), actor) != end(actors_to_run_)) {
+ XBT_DEBUG("Actor %s is already in the to_run list", actor->get_cname());
+ } else {
+ XBT_DEBUG("Inserting [%p] %s(%s) in the to_run list", actor, actor->get_cname(), actor->get_host()->get_cname());
+ actors_to_run_.push_back(actor);
+ }
+}
+void EngineImpl::empty_trash()
+{
+ while (not actors_to_destroy_.empty()) {
+ actor::ActorImpl* actor = &actors_to_destroy_.front();
+ actors_to_destroy_.pop_front();
+ XBT_DEBUG("Getting rid of %s (refcount: %d)", actor->get_cname(), actor->get_refcount());
+ intrusive_ptr_release(actor);
+ }
+}
+
+void EngineImpl::display_all_actor_status() const
+{
+ XBT_INFO("%zu actors are still running, waiting for something.", actor_list_.size());
+ /* List the actors and their state */
+ XBT_INFO("Legend of the following listing: \"Actor <pid> (<name>@<host>): <status>\"");
+ for (auto const& [_, actor] : actor_list_) {
+ if (actor->waiting_synchro_) {
+ const char* synchro_description = "unknown";
+
+ if (boost::dynamic_pointer_cast<kernel::activity::ExecImpl>(actor->waiting_synchro_) != nullptr)
+ synchro_description = "execution";
+
+ if (boost::dynamic_pointer_cast<kernel::activity::CommImpl>(actor->waiting_synchro_) != nullptr)
+ synchro_description = "communication";
+
+ if (boost::dynamic_pointer_cast<kernel::activity::SleepImpl>(actor->waiting_synchro_) != nullptr)
+ synchro_description = "sleeping";
+
+ if (boost::dynamic_pointer_cast<kernel::activity::SynchroImpl>(actor->waiting_synchro_) != nullptr)
+ synchro_description = "synchronization";
+
+ if (boost::dynamic_pointer_cast<kernel::activity::IoImpl>(actor->waiting_synchro_) != nullptr)
+ synchro_description = "I/O";
+
+ XBT_INFO("Actor %ld (%s@%s): waiting for %s activity %#zx (%s) in state %s to finish %s", actor->get_pid(),
+ actor->get_cname(), actor->get_host()->get_cname(), synchro_description,
+ (xbt_log_no_loc ? (size_t)0xDEADBEEF : (size_t)actor->waiting_synchro_.get()),
+ actor->waiting_synchro_->get_cname(), actor->waiting_synchro_->get_state_str(),
+ (actor->simcall_.observer_ != nullptr && not xbt_log_no_loc
+ ? actor->simcall_.observer_->to_string().c_str()
+ : ""));
+ } else {
+ XBT_INFO("Actor %ld (%s@%s) simcall %s", actor->get_pid(), actor->get_cname(), actor->get_host()->get_cname(),
+ (actor->simcall_.observer_ != nullptr ? actor->simcall_.observer_->to_string().c_str()
+ : actor->simcall_.get_cname()));
+ }
+ }
+}
+
+void EngineImpl::presolve() const
+{
+ XBT_DEBUG("Consume all trace events occurring before the starting time.");
+ double next_event_date;
+ while ((next_event_date = profile::future_evt_set.next_date()) != -1.0) {
+ if (next_event_date > now_)
+ break;
+
+ double value = -1.0;
+ resource::Resource* resource = nullptr;
+ while (auto* event = profile::future_evt_set.pop_leq(next_event_date, &value, &resource)) {
+ if (value >= 0)
+ resource->apply_event(event, value);
+ }
+ }
+
+ XBT_DEBUG("Set every models in the right state by updating them to 0.");
+ for (auto const& model : models_)
+ model->update_actions_state(now_, 0.0);
+}
+
+double EngineImpl::solve(double max_date) const
+{
+ double time_delta = -1.0; /* duration */
+ double value = -1.0;
+ resource::Resource* resource = nullptr;
+
+ if (max_date != -1.0) {
+ xbt_assert(max_date >= now_, "You asked to simulate up to %f, but that's in the past already", max_date);
+
+ time_delta = max_date - now_;
+ }
+
+ XBT_DEBUG("Looking for next event in all models");
+ for (auto model : models_) {
+ if (not model->next_occurring_event_is_idempotent()) {
+ continue;
+ }
+ double next_event = model->next_occurring_event(now_);
+ if ((time_delta < 0.0 || next_event < time_delta) && next_event >= 0.0) {
+ time_delta = next_event;
+ }
+ }
+
+ XBT_DEBUG("Min for resources (remember that NS3 don't update that value): %f", time_delta);
+
+ XBT_DEBUG("Looking for next trace event");
+
+ while (true) { // Handle next occurring events until none remains
+ double next_event_date = profile::future_evt_set.next_date();
+ XBT_DEBUG("Next TRACE event: %f", next_event_date);
+
+ for (auto model : models_) {
+ /* Skip all idempotent models, they were already treated above
+ * NS3 is the one to handled here */
+ if (model->next_occurring_event_is_idempotent())
+ continue;
+
+ if (next_event_date != -1.0) {
+ time_delta = std::min(next_event_date - now_, time_delta);
+ } else {
+ time_delta = std::max(next_event_date - now_, time_delta); // Get the positive component
+ }
+
+ XBT_DEBUG("Run the NS3 network at most %fs", time_delta);
+ // run until min or next flow
+ double model_next_action_end = model->next_occurring_event(time_delta);
+
+ XBT_DEBUG("Min for network : %f", model_next_action_end);
+ if (model_next_action_end >= 0.0)
+ time_delta = model_next_action_end;
+ }
+
+ if (next_event_date < 0.0 || (next_event_date > now_ + time_delta)) {
+ // next event may have already occurred or will after the next resource change, then bail out
+ XBT_DEBUG("no next usable TRACE event. Stop searching for it");
+ break;
+ }
+
+ XBT_DEBUG("Updating models (min = %g, NOW = %g, next_event_date = %g)", time_delta, now_, next_event_date);
+
+ while (auto* event = profile::future_evt_set.pop_leq(next_event_date, &value, &resource)) {
+ if(value<0)
+ continue;
+ if (resource->is_used() || (watched_hosts().find(resource->get_cname()) != watched_hosts().end())) {
+ time_delta = next_event_date - now_;
+ XBT_DEBUG("This event invalidates the next_occurring_event() computation of models. Next event set to %f",
+ time_delta);
+ }
+ // FIXME: I'm too lame to update now_ live, so I change it and restore it so that the real update with surf_min
+ // will work
+ double round_start = now_;
+ now_ = next_event_date;
+ /* update state of the corresponding resource to the new value. Does not touch lmm.
+ It will be modified if needed when updating actions */
+ XBT_DEBUG("Calling update_resource_state for resource %s", resource->get_cname());
+ resource->apply_event(event, value);
+ now_ = round_start;
+ }
+ }
+
+ /* FIXME: Moved this test to here to avoid stopping simulation if there are actions running on cpus and all cpus are
+ * with availability = 0. This may cause an infinite loop if one cpu has a trace with periodicity = 0 and the other a
+ * trace with periodicity > 0.
+ * The options are: all traces with same periodicity(0 or >0) or we need to change the way how the events are managed
+ */
+ if (time_delta < 0) {
+ XBT_DEBUG("No next event at all. Bail out now.");
+ return -1.0;
+ }
+
+ XBT_DEBUG("Duration set to %f", time_delta);
+
+ // Bump the time: jump into the future
+ now_ += time_delta;
+
+ // Inform the models of the date change
+ for (auto const& model : models_)
+ model->update_actions_state(now_, time_delta);
+
+ s4u::Engine::on_time_advance(time_delta);
+
+ return time_delta;
+}
+
+void EngineImpl::run(double max_date)
+{
+ seal_platform();
+
+ if (MC_is_active()) {
+#if SIMGRID_HAVE_MC
+ mc::AppSide::get()->main_loop();
+#else
+ xbt_die("MC_is_active() is not supposed to return true in non-MC settings");
+#endif
+ THROW_IMPOSSIBLE; // main_loop never returns
+ }
+
+ if (MC_record_replay_is_active()) {
+ mc::RecordTrace::replay(MC_record_path());
+ empty_trash();
+ return;
+ }
+
+ double elapsed_time = -1;
+ const std::set<s4u::Activity*>* vetoed_activities = s4u::Activity::get_vetoed_activities();
+
+ do {
+ XBT_DEBUG("New Schedule Round; size(queue)=%zu", actors_to_run_.size());
+
+ if (cfg_breakpoint >= 0.0 && simgrid_get_clock() >= cfg_breakpoint) {
+ XBT_DEBUG("Breakpoint reached (%g)", cfg_breakpoint.get());
+ cfg_breakpoint = -1.0; // Let the simulation continue without hiting the breakpoint again and again
+#ifdef SIGTRAP
+ std::raise(SIGTRAP);
+#else
+ std::raise(SIGABRT);
+#endif
+ }
+
+ while (not actors_to_run_.empty()) {
+ XBT_DEBUG("New Sub-Schedule Round; size(queue)=%zu", actors_to_run_.size());
+
+ /* Run all actors that are ready to run, possibly in parallel */
+ run_all_actors();
+
+ /* answer sequentially and in a fixed arbitrary order all the simcalls that were issued during that sub-round.
+ * The order must be fixed for the simulation to be reproducible (see RR-7653). It's OK here because only maestro
+ * changes the list. Killer actors are moved to the end to let victims finish their simcall before dying, but
+ * the order remains reproducible (even if arbitrarily). No need to sort the vector for sake of reproducibility.
+ */
+ for (auto const& actor : actors_that_ran_)
+ if (actor->simcall_.call_ != actor::Simcall::Type::NONE)
+ actor->simcall_handle(0);
+
+ handle_ended_actions();
+
+ /* If only daemon actors remain, cancel their actions, mark them to die and reschedule them */
+ if (actor_list_.size() == daemons_.size())
+ for (auto const& dmon : daemons_) {
+ XBT_DEBUG("Kill %s", dmon->get_cname());
+ maestro_->kill(dmon);
+ }
+ }
+
+ // Compute the max_date of the next solve.
+ // It's either when a timer occurs, or when user-specified deadline is reached, or -1 if none is given
+ double next_time = timer::Timer::next();
+ if (next_time < 0 && max_date > -1) {
+ next_time = max_date;
+ } else if (next_time > -1 && max_date > -1) { // either both <0, or both >0
+ next_time = std::min(next_time, max_date);
+ }
+
+ XBT_DEBUG("Calling solve(%g) %g", next_time, now_);
+ elapsed_time = solve(next_time);
+ XBT_DEBUG("Moving time ahead. NOW=%g; elapsed: %g", now_, elapsed_time);
+
+ // Execute timers until there isn't anything to be done:
+ bool again = false;
+ do {
+ again = timer::Timer::execute_all();
+ handle_ended_actions();
+ } while (again);
+
+ /* Clean actors to destroy */
+ empty_trash();
+
+ XBT_DEBUG("### elapsed time %f, #actors %zu, #to_run %zu, #vetoed %d", elapsed_time, actor_list_.size(),
+ actors_to_run_.size(), (vetoed_activities == nullptr ? -1 : static_cast<int>(vetoed_activities->size())));
+
+ if (elapsed_time < 0. && actors_to_run_.empty() && not actor_list_.empty()) {
+ if (actor_list_.size() <= daemons_.size()) {
+ XBT_CRITICAL("Oops! Daemon actors cannot do any blocking activity (communications, synchronization, etc) "
+ "once the simulation is over. Please fix your on_exit() functions.");
+ } else {
+ XBT_CRITICAL("Oops! Deadlock detected, some activities are still around but will never complete. "
+ "This usually happens when the user code is not perfectly clean.");
+ }
+ display_all_actor_status();
+ simgrid::s4u::Engine::on_deadlock();
+ for (auto const& [_, actor] : actor_list_) {
+ XBT_DEBUG("Kill %s", actor->get_cname());
+ maestro_->kill(actor);
+ }
+ }
+ } while ((vetoed_activities == nullptr || vetoed_activities->empty()) &&
+ ((elapsed_time > -1.0 && not double_equals(max_date, now_, 0.00001)) || has_actors_to_run()));
+
+ if (not actor_list_.empty() && max_date < 0 && not(vetoed_activities == nullptr || vetoed_activities->empty()))
+ THROW_IMPOSSIBLE;
+
+ simgrid::s4u::Engine::on_simulation_end();
+}
+
+double EngineImpl::get_clock()
+{
+ return now_;