#include "src/smpi/include/smpi_actor.hpp"
#include "src/surf/network_interface.hpp"
#include "src/surf/xml/platf.hpp"
-#include "surf/surf.hpp" //surf_presolve() and surf_solve()
#include "xbt/xbt_modinter.h" /* whether initialization was already done */
#include <boost/algorithm/string/predicate.hpp>
#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. */
#endif
}
+constexpr std::initializer_list<std::pair<const char*, context::ContextFactoryInitializer>> 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<std::string> context_factory_name("contexts/factory",
+ (std::string("Possible values: ") + contexts_list()).c_str(),
+ context_factories.begin()->first);
+
} // namespace kernel
} // namespace simgrid
/* register a function to be called by SURF after the environment creation */
sg_platf_init();
- s4u::Engine::on_platform_created.connect(surf_presolve);
+ s4u::Engine::on_platform_created.connect([this]() { this->presolve(); });
if (config::get_value<bool>("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<std::string>("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<std::string>("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)
}
}
+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()
{
if (MC_record_replay_is_active()) {
* - 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 SIMIX_comm_finish().
+ * - 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).
time = timer::Timer::next();
if (time > -1.0 || not actor_list_.empty()) {
- XBT_DEBUG("Calling surf_solve");
- time = surf_solve(time);
+ XBT_DEBUG("Calling solve");
+ time = solve(time);
XBT_DEBUG("Moving time ahead : %g", time);
}
simgrid::s4u::Engine::on_simulation_end();
}
+
+double EngineImpl::get_clock()
+{
+ return NOW;
+}
} // namespace kernel
} // namespace simgrid
