X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/54fd0549f818433dc1becb0c8c2b299158a8b674..0c586d7f087b772253980cafd92796edcbd58c50:/src/kernel/EngineImpl.cpp diff --git a/src/kernel/EngineImpl.cpp b/src/kernel/EngineImpl.cpp index d22046d53d..3a8229bb7e 100644 --- a/src/kernel/EngineImpl.cpp +++ b/src/kernel/EngineImpl.cpp @@ -1,20 +1,182 @@ -/* Copyright (c) 2016-2019. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2016-2022. The SimGrid Team. All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it * under the terms of the license (GNU LGPL) which comes with this package. */ +#include +#include +#include +#include +#include +#include + +#include "mc/mc.h" #include "src/kernel/EngineImpl.hpp" -#include "simgrid/Exception.hpp" -#include "simgrid/kernel/routing/NetPoint.hpp" -#include "simgrid/kernel/routing/NetZoneImpl.hpp" -#include "simgrid/s4u/Host.hpp" -#include "src/kernel/resource/DiskImpl.hpp" -#include "src/simix/smx_private.hpp" -#include "src/surf/StorageImpl.hpp" -#include "src/surf/network_interface.hpp" -#include "src/surf/xml/platf_private.hpp" // FIXME: KILLME. There must be a better way than mimicking XML here - -extern int surf_parse_lineno; +#include "src/kernel/resource/StandardLinkImpl.hpp" +#include "src/kernel/resource/profile/Profile.hpp" +#include "src/mc/mc_record.hpp" +#include "src/mc/mc_replay.hpp" +#include "src/smpi/include/smpi_actor.hpp" +#include "src/surf/xml/platf.hpp" +#include "xbt/xbt_modinter.h" /* whether initialization was already done */ + +#include +#ifndef _WIN32 +#include +#endif /* _WIN32 */ + +#if SIMGRID_HAVE_MC +#include "src/mc/remote/AppSide.hpp" +#endif + +double NOW = 0; + +XBT_LOG_NEW_DEFAULT_CATEGORY(ker_engine, "Logging specific to Engine (kernel)"); + +namespace simgrid { +namespace kernel { +EngineImpl* EngineImpl::instance_ = nullptr; /* That singleton is awful too. */ + +config::Flag cfg_breakpoint{"debug/breakpoint", + "When non-negative, raise a SIGTRAP after given (simulated) time", -1.0}; +config::Flag cfg_verbose_exit{"debug/verbose-exit", "Display the actor status at exit", true}; + +xbt_dynar_t get_actors_addr() +{ +#if SIMGRID_HAVE_MC + return EngineImpl::get_instance()->get_actors_vector(); +#else + xbt_die("This function is intended to be used when compiling with MC"); +#endif +} + +xbt_dynar_t get_dead_actors_addr() +{ +#if SIMGRID_HAVE_MC + return EngineImpl::get_instance()->get_dead_actors_vector(); +#else + xbt_die("This function is intended to be used when compiling with MC"); +#endif +} + +constexpr std::initializer_list> context_factories = { +#if HAVE_RAW_CONTEXTS + {"raw", &context::raw_factory}, +#endif +#if HAVE_UCONTEXT_CONTEXTS + {"ucontext", &context::sysv_factory}, +#endif +#if HAVE_BOOST_CONTEXTS + {"boost", &context::boost_factory}, +#endif + {"thread", &context::thread_factory}, +}; + +static_assert(context_factories.size() > 0, "No context factories are enabled for this build"); + +// Create the list of possible contexts: +static inline std::string contexts_list() +{ + std::string res; + std::string sep = ""; + for (auto const& factory : context_factories) { + res += sep + factory.first; + sep = ", "; + } + return res; +} + +static config::Flag context_factory_name("contexts/factory", + (std::string("Possible values: ") + contexts_list()).c_str(), + context_factories.begin()->first); + +} // namespace kernel +} // namespace simgrid + +XBT_ATTRIB_NORETURN static void inthandler(int) +{ + if (simgrid::kernel::cfg_verbose_exit) { + XBT_INFO("CTRL-C pressed. The current status will be displayed before exit (disable that behavior with option " + "'debug/verbose-exit')."); + simgrid::kernel::EngineImpl::get_instance()->display_all_actor_status(); + } else { + XBT_INFO("CTRL-C pressed, exiting. Hiding the current process status since 'debug/verbose-exit' is set to false."); + } + exit(1); +} + +#ifndef _WIN32 +static void segvhandler(int signum, siginfo_t* siginfo, void* /*context*/) +{ + if ((siginfo->si_signo == SIGSEGV && siginfo->si_code == SEGV_ACCERR) || siginfo->si_signo == SIGBUS) { + fprintf(stderr, + "Access violation or Bus error detected.\n" + "This probably comes from a programming error in your code, or from a stack\n" + "overflow. If you are certain of your code, try increasing the stack size\n" + " --cfg=contexts/stack-size:XXX (current size is %u KiB).\n" + "\n" + "If it does not help, this may have one of the following causes:\n" + "a bug in SimGrid, a bug in the OS or a bug in a third-party libraries.\n" + "Failing hardware can sometimes generate such errors too.\n" + "\n" + "If you think you've found a bug in SimGrid, please report it along with a\n" + "Minimal Working Example (MWE) reproducing your problem and a full backtrace\n" + "of the fault captured with gdb or valgrind.\n", + simgrid::kernel::context::stack_size / 1024); + } else if (siginfo->si_signo == SIGSEGV) { + fprintf(stderr, "Segmentation fault.\n"); +#if HAVE_SMPI + if (smpi_enabled() && smpi_cfg_privatization() == SmpiPrivStrategies::NONE) { +#if HAVE_PRIVATIZATION + fprintf(stderr, "Try to enable SMPI variable privatization with --cfg=smpi/privatization:yes.\n"); +#else + fprintf(stderr, "Sadly, your system does not support --cfg=smpi/privatization:yes (yet).\n"); +#endif /* HAVE_PRIVATIZATION */ + } +#endif /* HAVE_SMPI */ + } + std::raise(signum); +} + +/** + * Install signal handler for SIGSEGV. Check that nobody has already installed + * its own handler. For example, the Java VM does this. + */ +static void install_segvhandler() +{ + stack_t old_stack; + + if (simgrid::kernel::context::Context::install_sigsegv_stack(&old_stack, true) == -1) { + XBT_WARN("Failed to register alternate signal stack: %s", strerror(errno)); + return; + } + if (not(old_stack.ss_flags & SS_DISABLE)) { + XBT_DEBUG("An alternate stack was already installed (sp=%p, size=%zu, flags=%x). Restore it.", old_stack.ss_sp, + old_stack.ss_size, (unsigned)old_stack.ss_flags); + sigaltstack(&old_stack, nullptr); + } + + struct sigaction action; + struct sigaction old_action; + action.sa_sigaction = &segvhandler; + action.sa_flags = SA_ONSTACK | SA_RESETHAND | SA_SIGINFO; + sigemptyset(&action.sa_mask); + + /* Linux tend to raise only SIGSEGV where other systems also raise SIGBUS on severe error */ + for (int sig : {SIGSEGV, SIGBUS}) { + if (sigaction(sig, &action, &old_action) == -1) { + XBT_WARN("Failed to register signal handler for signal %d: %s", sig, strerror(errno)); + continue; + } + if ((old_action.sa_flags & SA_SIGINFO) || old_action.sa_handler != SIG_DFL) { + XBT_DEBUG("A signal handler was already installed for signal %d (%p). Restore it.", sig, + (old_action.sa_flags & SA_SIGINFO) ? (void*)old_action.sa_sigaction : (void*)old_action.sa_handler); + sigaction(sig, &old_action, nullptr); + } + } +} + +#endif /* _WIN32 */ namespace simgrid { namespace kernel { @@ -32,16 +194,193 @@ EngineImpl::~EngineImpl() for (auto const& kv : netpoints_) delete kv.second; - for (auto const& kv : storages_) - if (kv.second) - kv.second->destroy(); + while (not links_.empty()) + links_.begin()->second->destroy(); + + for (auto const& kv : mailboxes_) + delete kv.second; + + /* Free the remaining data structures */ +#if SIMGRID_HAVE_MC + xbt_dynar_free(&actors_vector_); + xbt_dynar_free(&dead_actors_vector_); +#endif + /* clear models before freeing handle, network models can use external callback defined in the handle */ + models_prio_.clear(); +} + +void EngineImpl::initialize(int* argc, char** argv) +{ + xbt_assert(EngineImpl::instance_ == nullptr, + "It is currently forbidden to create more than one instance of kernel::EngineImpl"); + EngineImpl::instance_ = this; +#if SIMGRID_HAVE_MC + // The communication initialization is done ASAP, as we need to get some init parameters from the MC for different + // layers. But simix_global needs to be created, as we send the address of some of its fields to the MC that wants to + // read them directly. + simgrid::mc::AppSide::initialize(); +#endif + + if (xbt_initialized == 0) { + xbt_init(argc, argv); + + sg_config_init(argc, argv); + } + instance_->context_mod_init(); + + /* Prepare to display some more info when dying on Ctrl-C pressing */ + std::signal(SIGINT, inthandler); + +#ifndef _WIN32 + install_segvhandler(); +#endif + + /* register a function to be called by SURF after the environment creation */ + sg_platf_init(); + s4u::Engine::on_platform_created_cb([this]() { this->presolve(); }); + + if (config::get_value("debug/clean-atexit")) + atexit(shutdown); +} + +void EngineImpl::context_mod_init() const +{ + xbt_assert(not instance_->has_context_factory()); + +#if HAVE_SMPI && defined(__NetBSD__) + smpi_init_options_internal(false); + std::string priv = config::get_value("smpi/privatization"); + if (context_factory_name == "thread" && (priv == "dlopen" || priv == "yes" || priv == "default" || priv == "1")) { + XBT_WARN("dlopen+thread broken on Apple and BSD. Switching to raw contexts."); + context_factory_name = "raw"; + } +#endif + +#if HAVE_SMPI && defined(__FreeBSD__) + smpi_init_options_internal(false); + if (context_factory_name == "thread" && config::get_value("smpi/privatization") != "no") { + XBT_WARN("mmap broken on FreeBSD, but dlopen+thread broken too. Switching to dlopen+raw contexts."); + context_factory_name = "raw"; + } +#endif + + /* select the context factory to use to create the contexts */ + if (context::factory_initializer != nullptr) { // Give Java a chance to hijack the factory mechanism + instance_->set_context_factory(context::factory_initializer()); + return; + } + /* use the factory specified by --cfg=contexts/factory:value */ + for (auto const& factory : context_factories) + if (context_factory_name == factory.first) { + instance_->set_context_factory(factory.second()); + break; + } + + if (not instance_->has_context_factory()) { + XBT_ERROR("Invalid context factory specified. Valid factories on this machine:"); +#if HAVE_RAW_CONTEXTS + XBT_ERROR(" raw: high performance context factory implemented specifically for SimGrid"); +#else + XBT_ERROR(" (raw contexts were disabled at compilation time on this machine -- check configure logs for details)"); +#endif +#if HAVE_UCONTEXT_CONTEXTS + XBT_ERROR(" ucontext: classical system V contexts (implemented with makecontext, swapcontext and friends)"); +#else + XBT_ERROR(" (ucontext was disabled at compilation time on this machine -- check configure logs for details)"); +#endif +#if HAVE_BOOST_CONTEXTS + XBT_ERROR(" boost: this uses the boost libraries context implementation"); +#else + XBT_ERROR(" (boost was disabled at compilation time on this machine -- check configure logs for details. Did you " + "install the libboost-context-dev package?)"); +#endif + XBT_ERROR(" thread: slow portability layer using pthreads as provided by gcc"); + xbt_die("Please use a valid factory."); + } +} + +void EngineImpl::shutdown() +{ + if (EngineImpl::instance_ == nullptr) + return; + XBT_DEBUG("EngineImpl::shutdown() called. Simulation's over."); +#if HAVE_SMPI + if (not instance_->actor_list_.empty()) { + if (smpi_process()->initialized()) { + xbt_die("Process exited without calling MPI_Finalize - Killing simulation"); + } else { + XBT_WARN("Process called exit when leaving - Skipping cleanups"); + return; + } + } +#endif + + if (instance_->has_actors_to_run() && simgrid_get_clock() <= 0.0) { + XBT_CRITICAL(" "); + XBT_CRITICAL("The time is still 0, and you still have processes ready to run."); + XBT_CRITICAL("It seems that you forgot to run the simulation that you setup."); + xbt_die("Bailing out to avoid that stop-before-start madness. Please fix your code."); + } + + /* Kill all actors (but maestro) */ + instance_->maestro_->kill_all(); + instance_->run_all_actors(); + instance_->empty_trash(); + + /* Let's free maestro now */ + delete instance_->maestro_; + instance_->maestro_ = nullptr; + + /* Finish context module and SURF */ + instance_->destroy_context_factory(); + + while (not timer::kernel_timers().empty()) { + delete timer::kernel_timers().top().second; + timer::kernel_timers().pop(); + } + + tmgr_finalize(); + sg_platf_exit(); + + delete instance_; + instance_ = nullptr; +} + +void EngineImpl::seal_platform() const +{ + /* sealing resources before run: links */ for (auto const& kv : links_) - if (kv.second) - kv.second->destroy(); + kv.second->get_iface()->seal(); + /* seal netzone root, recursively seal children netzones, hosts and disks */ + netzone_root_->seal(); } -void EngineImpl::load_deployment(const std::string& file) +void EngineImpl::load_platform(const std::string& platf) +{ + double start = xbt_os_time(); + if (boost::algorithm::ends_with(platf, ".so") or boost::algorithm::ends_with(platf, ".dylib")) { +#ifdef _WIN32 + xbt_die("loading platform through shared library isn't supported on windows"); +#else + void* handle = dlopen(platf.c_str(), RTLD_LAZY); + xbt_assert(handle, "Impossible to open platform file: %s", platf.c_str()); + platf_handle_ = std::unique_ptr>(handle, dlclose); + using load_fct_t = void (*)(const simgrid::s4u::Engine&); + auto callable = (load_fct_t)dlsym(platf_handle_.get(), "load_platform"); + const char* dlsym_error = dlerror(); + xbt_assert(not dlsym_error, "Error: %s", dlsym_error); + callable(*simgrid::s4u::Engine::get_instance()); +#endif /* _WIN32 */ + } else { + parse_platform_file(platf); + } + + double end = xbt_os_time(); + XBT_DEBUG("PARSE TIME: %g", (end - start)); +} + +void EngineImpl::load_deployment(const std::string& file) const { sg_platf_exit(); sg_platf_init(); @@ -50,26 +389,491 @@ void EngineImpl::load_deployment(const std::string& file) surf_parse(); surf_parse_close(); } -void EngineImpl::register_function(const std::string& name, xbt_main_func_t code) + +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 model, const std::vector& 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); +} + +void EngineImpl::add_split_duplex_link(const std::string& name, std::unique_ptr link) +{ + split_duplex_links_[name] = std::move(link); +} + +/** Wake up all actors waiting for a Surf action to finish */ +void EngineImpl::wake_all_waiting_actors() 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) { + // If nobody told the interface that the activity has failed, that's because no actor waits on it (maestro + // started it). SimDAG I see you! + 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) + XBT_DEBUG("probably vcpu's action %p, skip", action); + else { + // If nobody told the interface that the activity is finished, that's because no actor waits on it (maestro + // started it). SimDAG I see you! + 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() { - simix_global->registered_functions[name] = [code](std::vector args) { - return simgrid::xbt::wrap_main(code, std::move(args)); - }; + instance_->get_context_factory()->run_all(); + + actors_to_run_.swap(actors_that_ran_); + actors_to_run_.clear(); } -void EngineImpl::register_function(const std::string& name, void (*code)(std::vector)) +actor::ActorImpl* EngineImpl::get_actor_by_pid(aid_t pid) { - simix_global->registered_functions[name] = [code](std::vector args) { - return std::bind(std::move(code), std::move(args)); - }; + auto item = actor_list_.find(pid); + if (item != actor_list_.end()) + return item->second; + + // Search the trash + for (auto& a : actors_to_destroy_) + if (a.get_pid() == pid) + return &a; + return nullptr; // Not found, even in the trash } -void EngineImpl::register_default(xbt_main_func_t code) +/** Execute all the tasks that are queued, e.g. `.then()` callbacks of futures. */ +bool EngineImpl::execute_tasks() { - simix_global->default_function = [code](std::vector args) { - return simgrid::xbt::wrap_main(code, std::move(args)); - }; + if (tasks.empty()) + return false; + + std::vector> tasksTemp; + do { + // We don't want the callbacks to modify the vector we are iterating over: + tasks.swap(tasksTemp); + + // Execute all the queued tasks: + for (auto& task : tasksTemp) + task(); + + tasksTemp.clear(); + } while (not tasks.empty()); + + return true; } +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); + } +#if SIMGRID_HAVE_MC + xbt_dynar_reset(dead_actors_vector_); +#endif +} + +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 (@): \""); + for (auto const& kv : actor_list_) { + actor::ActorImpl* actor = kv.second; + + if (actor->waiting_synchro_) { + const char* synchro_description = "unknown"; + + if (boost::dynamic_pointer_cast(actor->waiting_synchro_) != nullptr) + synchro_description = "execution"; + + if (boost::dynamic_pointer_cast(actor->waiting_synchro_) != nullptr) + synchro_description = "communication"; + + if (boost::dynamic_pointer_cast(actor->waiting_synchro_) != nullptr) + synchro_description = "sleeping"; + + if (boost::dynamic_pointer_cast(actor->waiting_synchro_) != nullptr) + synchro_description = "synchronization"; + + if (boost::dynamic_pointer_cast(actor->waiting_synchro_) != nullptr) + synchro_description = "I/O"; + + XBT_INFO("Actor %ld (%s@%s): waiting for %s activity %#zx (%s) in state %d to finish", 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(), (int)actor->waiting_synchro_->state_); + } else { + XBT_INFO("Actor %ld (%s@%s) simcall %s", actor->get_pid(), actor->get_cname(), actor->get_host()->get_cname(), + SIMIX_simcall_name(actor->simcall_)); + } + } +} + +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 (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 = 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_record_replay_is_active()) { + mc::replay(MC_record_path()); + empty_trash(); + return; + } + + double elapsed_time = -1; + const std::set* 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; +#ifdef SIGTRAP + std::raise(SIGTRAP); +#else + std::raise(SIGABRT); +#endif + } + + execute_tasks(); + + 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 */ + + /* WARNING, the order *must* be fixed or you'll jeopardize the simulation reproducibility (see RR-7653) */ + + /* Here, the order is ok because: + * + * Short proof: only maestro adds stuff to the actors_to_run array, so the execution order of user contexts do + * not impact its order. + * + * Long proof: actors remain sorted through an arbitrary (implicit, complex but fixed) order in all cases. + * + * - if there is no kill during the simulation, actors remain sorted according by their PID. + * Rationale: This can be proved inductively. + * Assume that actors_to_run is sorted at a beginning of one round (it is at round 0: the deployment file + * is parsed linearly). + * Let's show that it is still so at the end of this round. + * - if an actor is added when being created, that's from maestro. It can be either at startup + * time (and then in PID order), or in response to a process_create simcall. Since simcalls are handled + * in arbitrary order (inductive hypothesis), we are fine. + * - If an actor is added because it's getting killed, its subsequent actions shouldn't matter + * - If an actor gets added to actors_to_run because one of their blocking action constituting the meat + * of a simcall terminates, we're still good. Proof: + * - You are added from ActorImpl::simcall_answer() only. When this function is called depends on the + * resource kind (network, cpu, disk, whatever), but the same arguments hold. Let's take communications + * as an example. + * - For communications, this function is called from CommImpl::finish(). + * This function itself don't mess with the order since simcalls are handled in FIFO order. + * The function is called: + * - before the comm starts (invalid parameters, or resource already dead or whatever). + * The order then trivial holds since maestro didn't interrupt its handling of the simcall yet + * - because the communication failed or were canceled after startup. In this case, it's called from + * the function we are in, by the chunk: + * set = model->states.failed_action_set; + * while ((synchro = extract(set))) + * SIMIX_simcall_post((smx_synchro_t) synchro->data); + * This order is also fixed because it depends of the order in which the surf actions were + * added to the system, and only maestro can add stuff this way, through simcalls. + * We thus use the inductive hypothesis once again to conclude that the order in which synchros are + * popped out of the set does not depend on the user code's execution order. + * - because the communication terminated. In this case, synchros are served in the order given by + * set = model->states.done_action_set; + * while ((synchro = extract(set))) + * SIMIX_simcall_post((smx_synchro_t) synchro->data); + * and the argument is very similar to the previous one. + * So, in any case, the orders of calls to CommImpl::finish() do not depend on the order in which user + * actors are executed. + * So, in any cases, the orders of actors within actors_to_run do not depend on the order in which + * user actors were executed previously. + * So, if there is no killing in the simulation, the simulation reproducibility is not jeopardized. + * - If there is some actor killings, the order is changed by this decision that comes from user-land + * But this decision may not have been motivated by a situation that were different because the simulation is + * not reproducible. + * So, even the order change induced by the actor killing is perfectly reproducible. + * + * So science works, bitches [http://xkcd.com/54/]. + * + * We could sort the actors_that_ran array completely so that we can describe the order in which simcalls are + * handled (like "according to the PID of issuer"), but it's not mandatory (order is fixed already even if + * unfriendly). + * That would thus be a pure waste of time. + */ + + for (auto const& actor : actors_that_ran_) { + if (actor->simcall_.call_ != simix::Simcall::NONE) { + actor->simcall_handle(0); + } + } + + execute_tasks(); + do { + wake_all_waiting_actors(); + } while (execute_tasks()); + + /* 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); + + /* Notify all the hosts that have failed */ + /* FIXME: iterate through the list of failed host and mark each of them */ + /* as failed. On each host, signal all the running actors with host_fail */ + + // Execute timers and tasks until there isn't anything to be done: + bool again = false; + do { + again = timer::Timer::execute_all(); + if (execute_tasks()) + again = true; + wake_all_waiting_actors(); + } 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(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 or code not perfectly clean."); + } + display_all_actor_status(); + simgrid::s4u::Engine::on_deadlock(); + for (auto const& kv : actor_list_) { + XBT_DEBUG("Kill %s", kv.second->get_cname()); + maestro_->kill(kv.second); + } + } + } 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; +} } // namespace kernel } // namespace simgrid + +void SIMIX_run() // XBT_ATTRIB_DEPRECATED_v332 +{ + simgrid::kernel::EngineImpl::get_instance()->run(-1); +}