-/* Copyright (c) 2013-2021. 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 <simgrid/s4u/Engine.hpp>
-
-#include "src/instr/instr_private.hpp"
-#include "src/kernel/EngineImpl.hpp"
-#include "src/kernel/resource/DiskImpl.hpp"
-#include "src/kernel/resource/VirtualMachineImpl.hpp"
-#include "src/kernel/resource/profile/FutureEvtSet.hpp"
-#include "surf/surf.hpp"
-
-#include <algorithm>
-
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_kernel);
-
-/*********
- * TOOLS *
- *********/
-
-extern double NOW;
-
-void surf_presolve()
-{
- XBT_DEBUG("Consume all trace events occurring before the starting time.");
- double next_event_date;
- while ((next_event_date = simgrid::kernel::profile::future_evt_set.next_date()) != -1.0) {
- if (next_event_date > NOW)
- break;
-
- double value = -1.0;
- simgrid::kernel::resource::Resource* resource = nullptr;
- while (auto* event = simgrid::kernel::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 : simgrid::kernel::EngineImpl::get_instance()->get_all_models())
- model->update_actions_state(NOW, 0.0);
-}
-
-double surf_solve(double max_date)
-{
- double time_delta = -1.0; /* duration */
- double value = -1.0;
- simgrid::kernel::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");
- auto engine = simgrid::kernel::EngineImpl::get_instance();
- for (auto model : engine->get_all_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 = simgrid::kernel::profile::future_evt_set.next_date();
- XBT_DEBUG("Next TRACE event: %f", next_event_date);
-
- for (auto model : engine->get_all_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 = simgrid::kernel::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 : simgrid::kernel::EngineImpl::get_instance()->get_all_models())
- model->update_actions_state(NOW, time_delta);
-
- simgrid::s4u::Engine::on_time_advance(time_delta);
-
- return time_delta;
-}