1 /* Copyright (c) 2013-2020. 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 "simgrid/s4u/Engine.hpp"
7 #include "src/include/surf/surf.hpp"
8 #include "src/instr/instr_private.hpp"
9 #include "src/kernel/resource/DiskImpl.hpp"
10 #include "src/kernel/resource/profile/FutureEvtSet.hpp"
11 #include "src/plugins/vm/VirtualMachineImpl.hpp"
15 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_kernel);
25 double next_event_date = -1.0;
26 simgrid::kernel::profile::Event* event = nullptr;
28 simgrid::kernel::resource::Resource* resource = nullptr;
30 XBT_DEBUG ("Consume all trace events occurring before the starting time.");
31 while ((next_event_date = simgrid::kernel::profile::future_evt_set.next_date()) != -1.0) {
32 if (next_event_date > NOW)
35 while ((event = simgrid::kernel::profile::future_evt_set.pop_leq(next_event_date, &value, &resource))) {
37 resource->apply_event(event, value);
41 XBT_DEBUG ("Set every models in the right state by updating them to 0.");
42 for (auto const& model : all_existing_models)
43 model->update_actions_state(NOW, 0.0);
46 double surf_solve(double max_date)
48 double time_delta = -1.0; /* duration */
50 simgrid::kernel::resource::Resource* resource = nullptr;
51 simgrid::kernel::profile::Event* event = nullptr;
54 xbt_assert(max_date > NOW,"You asked to simulate up to %f, but that's in the past already", max_date);
56 time_delta = max_date - NOW;
59 /* Physical models MUST be resolved first */
60 XBT_DEBUG("Looking for next event in physical models");
61 double next_event_phy = surf_host_model->next_occurring_event(NOW);
62 if ((time_delta < 0.0 || next_event_phy < time_delta) && next_event_phy >= 0.0) {
63 time_delta = next_event_phy;
65 if (surf_vm_model != nullptr) {
66 XBT_DEBUG("Looking for next event in virtual models");
67 double next_event_virt = surf_vm_model->next_occurring_event(NOW);
68 if ((time_delta < 0.0 || next_event_virt < time_delta) && next_event_virt >= 0.0)
69 time_delta = next_event_virt;
72 for (auto const& model : all_existing_models) {
73 if (model != surf_host_model && model != surf_vm_model && model != surf_network_model &&
74 model != surf_storage_model && model != surf_disk_model) {
75 double next_event_model = model->next_occurring_event(NOW);
76 if ((time_delta < 0.0 || next_event_model < time_delta) && next_event_model >= 0.0)
77 time_delta = next_event_model;
81 XBT_DEBUG("Min for resources (remember that NS3 don't update that value): %f", time_delta);
83 XBT_DEBUG("Looking for next trace event");
85 while (true) { // Handle next occurring events until none remains
86 double next_event_date = simgrid::kernel::profile::future_evt_set.next_date();
87 XBT_DEBUG("Next TRACE event: %f", next_event_date);
89 if (not surf_network_model->next_occurring_event_is_idempotent()) { // NS3, I see you
90 if (next_event_date != -1.0) {
91 time_delta = std::min(next_event_date - NOW, time_delta);
93 time_delta = std::max(next_event_date - NOW, time_delta); // Get the positive component
96 XBT_DEBUG("Run the NS3 network at most %fs", time_delta);
97 // run until min or next flow
98 double model_next_action_end = surf_network_model->next_occurring_event(time_delta);
100 XBT_DEBUG("Min for network : %f", model_next_action_end);
101 if (model_next_action_end >= 0.0)
102 time_delta = model_next_action_end;
105 if (next_event_date < 0.0 || (next_event_date > NOW + time_delta)) {
106 // next event may have already occurred or will after the next resource change, then bail out
107 XBT_DEBUG("no next usable TRACE event. Stop searching for it");
111 XBT_DEBUG("Updating models (min = %g, NOW = %g, next_event_date = %g)", time_delta, NOW, next_event_date);
113 while ((event = simgrid::kernel::profile::future_evt_set.pop_leq(next_event_date, &value, &resource))) {
114 if (resource->is_used() || (watched_hosts.find(resource->get_cname()) != watched_hosts.end())) {
115 time_delta = next_event_date - NOW;
116 XBT_DEBUG("This event invalidates the next_occurring_event() computation of models. Next event set to %f",
119 // 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
120 double round_start = NOW;
121 NOW = next_event_date;
122 /* update state of the corresponding resource to the new value. Does not touch lmm.
123 It will be modified if needed when updating actions */
124 XBT_DEBUG("Calling update_resource_state for resource %s", resource->get_cname());
125 resource->apply_event(event, value);
130 /* FIXME: Moved this test to here to avoid stopping simulation if there are actions running on cpus and all cpus are with availability = 0.
131 * This may cause an infinite loop if one cpu has a trace with periodicity = 0 and the other a trace with periodicity > 0.
132 * The options are: all traces with same periodicity(0 or >0) or we need to change the way how the events are managed */
133 if (time_delta < 0) {
134 XBT_DEBUG("No next event at all. Bail out now.");
138 XBT_DEBUG("Duration set to %f", time_delta);
140 // Bump the time: jump into the future
141 NOW = NOW + time_delta;
143 // Inform the models of the date change
144 for (auto const& model : all_existing_models)
145 model->update_actions_state(NOW, time_delta);
147 simgrid::s4u::Engine::on_time_advance(time_delta);