1 /* Copyright (c) 2007-2021. 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 "ptask_L07.hpp"
7 #include "simgrid/kernel/routing/NetZoneImpl.hpp"
8 #include "simgrid/s4u/Engine.hpp"
9 #include "src/kernel/EngineImpl.hpp"
10 #include "src/kernel/resource/profile/Event.hpp"
11 #include "surf/surf.hpp"
12 #include "xbt/config.hpp"
14 #include <unordered_set>
16 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_host);
17 XBT_LOG_EXTERNAL_CATEGORY(xbt_cfg);
19 /**************************************/
20 /*** Resource Creation & Destruction **/
21 /**************************************/
22 void surf_host_model_init_ptask_L07()
24 XBT_CINFO(xbt_cfg, "Switching to the L07 model to handle parallel tasks.");
26 auto host_model = std::make_shared<simgrid::surf::HostL07Model>("Host_Ptask");
27 simgrid::kernel::EngineImpl::get_instance()->add_model(host_model);
28 simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_host_model(host_model);
34 HostL07Model::HostL07Model(const std::string& name) : HostModel(name)
36 auto* maxmin_system = new simgrid::kernel::lmm::FairBottleneck(true /* selective update */);
37 set_maxmin_system(maxmin_system);
39 auto net_model = std::make_shared<NetworkL07Model>("Network_Ptask", this, maxmin_system);
40 auto engine = simgrid::kernel::EngineImpl::get_instance();
41 engine->add_model(net_model);
42 simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_network_model(net_model);
44 auto cpu_model = std::make_shared<CpuL07Model>("Cpu_Ptask", this, maxmin_system);
45 engine->add_model(cpu_model);
46 simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_cpu_pm_model(cpu_model);
49 CpuL07Model::CpuL07Model(const std::string& name, HostL07Model* hmodel, kernel::lmm::System* sys)
50 : CpuModel(name), hostModel_(hmodel)
52 set_maxmin_system(sys);
55 CpuL07Model::~CpuL07Model()
57 set_maxmin_system(nullptr);
60 NetworkL07Model::NetworkL07Model(const std::string& name, HostL07Model* hmodel, kernel::lmm::System* sys)
61 : NetworkModel(name), hostModel_(hmodel)
63 set_maxmin_system(sys);
64 loopback_ = NetworkL07Model::create_link(
65 "__loopback__", std::vector<double>{simgrid::config::get_value<double>("network/loopback-bw")},
66 s4u::Link::SharingPolicy::FATPIPE)
67 ->set_latency(simgrid::config::get_value<double>("network/loopback-lat"));
71 NetworkL07Model::~NetworkL07Model()
73 set_maxmin_system(nullptr);
76 double HostL07Model::next_occurring_event(double now)
78 double min = HostModel::next_occurring_event_full(now);
79 for (kernel::resource::Action const& action : *get_started_action_set()) {
80 const auto& net_action = static_cast<const L07Action&>(action);
81 if (net_action.get_latency() > 0 && (min < 0 || net_action.get_latency() < min)) {
82 min = net_action.get_latency();
83 XBT_DEBUG("Updating min with %p (start %f): %f", &net_action, net_action.get_start_time(), min);
86 XBT_DEBUG("min value: %f", min);
91 void HostL07Model::update_actions_state(double /*now*/, double delta)
93 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
94 auto& action = static_cast<L07Action&>(*it);
95 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
96 if (action.get_latency() > 0) {
97 if (action.get_latency() > delta) {
98 action.update_latency(delta, sg_surf_precision);
100 action.set_latency(0.0);
102 if ((action.get_latency() <= 0.0) && (action.is_suspended() == 0)) {
103 action.updateBound();
104 get_maxmin_system()->update_variable_penalty(action.get_variable(), 1.0);
105 action.set_last_update();
108 XBT_DEBUG("Action (%p) : remains (%g) updated by %g.", &action, action.get_remains(),
109 action.get_variable()->get_value() * delta);
110 action.update_remains(action.get_variable()->get_value() * delta);
111 action.update_max_duration(delta);
113 XBT_DEBUG("Action (%p) : remains (%g).", &action, action.get_remains());
115 /* In the next if cascade, the action can be finished either because:
116 * - The amount of remaining work reached 0
117 * - The max duration was reached
118 * If it's not done, it may have failed.
121 if (((action.get_remains() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
122 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
123 action.finish(kernel::resource::Action::State::FINISHED);
127 /* Need to check that none of the model has failed */
129 const kernel::lmm::Constraint* cnst = action.get_variable()->get_constraint(i);
130 while (cnst != nullptr) {
132 const kernel::resource::Resource* constraint_id = cnst->get_id();
133 if (not constraint_id->is_on()) {
134 XBT_DEBUG("Action (%p) Failed!!", &action);
135 action.finish(kernel::resource::Action::State::FAILED);
138 cnst = action.get_variable()->get_constraint(i);
143 kernel::resource::CpuAction* HostL07Model::execute_parallel(const std::vector<s4u::Host*>& host_list,
144 const double* flops_amount, const double* bytes_amount,
147 return new L07Action(this, host_list, flops_amount, bytes_amount, rate);
150 L07Action::L07Action(kernel::resource::Model* model, const std::vector<s4u::Host*>& host_list,
151 const double* flops_amount, const double* bytes_amount, double rate)
152 : CpuAction(model, 1.0, false), computationAmount_(flops_amount), communicationAmount_(bytes_amount), rate_(rate)
155 size_t used_host_nb = 0; /* Only the hosts with something to compute (>0 flops) are counted) */
156 double latency = 0.0;
157 this->set_last_update();
159 hostList_.insert(hostList_.end(), host_list.begin(), host_list.end());
161 if (flops_amount != nullptr)
162 used_host_nb += std::count_if(flops_amount, flops_amount + host_list.size(), [](double x) { return x > 0.0; });
164 /* Compute the number of affected resources... */
165 if (bytes_amount != nullptr) {
166 std::unordered_set<const char*> affected_links;
168 for (size_t k = 0; k < host_list.size() * host_list.size(); k++) {
169 if (bytes_amount[k] <= 0)
173 std::vector<kernel::resource::LinkImpl*> route;
174 hostList_[k / host_list.size()]->route_to(hostList_[k % host_list.size()], route, &lat);
175 latency = std::max(latency, lat);
177 for (auto const& link : route)
178 affected_links.insert(link->get_cname());
181 link_nb = affected_links.size();
184 XBT_DEBUG("Creating a parallel task (%p) with %zu hosts and %zu unique links.", this, host_list.size(), link_nb);
188 model->get_maxmin_system()->variable_new(this, 1.0, (rate > 0 ? rate : -1.0), host_list.size() + link_nb));
191 model->get_maxmin_system()->update_variable_penalty(get_variable(), 0.0);
193 /* Expand it for the CPUs even if there is nothing to compute, to make sure that it gets expended even if there is no
194 * communication either */
195 double bound = std::numeric_limits<double>::max();
196 for (size_t i = 0; i < host_list.size(); i++) {
197 model->get_maxmin_system()->expand(host_list[i]->pimpl_cpu->get_constraint(), get_variable(),
198 (flops_amount == nullptr ? 0.0 : flops_amount[i]));
199 if (flops_amount && flops_amount[i] > 0)
200 bound = std::min(bound, host_list[i]->pimpl_cpu->get_speed(1.0) * host_list[i]->pimpl_cpu->get_speed_ratio() /
203 if (bound < std::numeric_limits<double>::max())
204 model->get_maxmin_system()->update_variable_bound(get_variable(), bound);
206 if (bytes_amount != nullptr) {
207 for (size_t k = 0; k < host_list.size() * host_list.size(); k++) {
208 if (bytes_amount[k] <= 0.0)
210 std::vector<kernel::resource::LinkImpl*> route;
211 hostList_[k / host_list.size()]->route_to(hostList_[k % host_list.size()], route, nullptr);
213 for (auto const& link : route)
214 model->get_maxmin_system()->expand_add(link->get_constraint(), this->get_variable(), bytes_amount[k]);
218 if (link_nb + used_host_nb == 0) {
220 this->set_remains(0.0);
224 kernel::resource::Action* NetworkL07Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
226 std::vector<s4u::Host*> host_list = {src, dst};
227 const auto* flops_amount = new double[2]();
228 auto* bytes_amount = new double[4]();
230 bytes_amount[1] = size;
232 kernel::resource::Action* res = hostModel_->execute_parallel(host_list, flops_amount, bytes_amount, rate);
233 static_cast<L07Action*>(res)->free_arrays_ = true;
237 kernel::resource::Cpu* CpuL07Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
239 return (new CpuL07(host, speed_per_pstate))->set_model(this);
242 kernel::resource::LinkImpl* NetworkL07Model::create_link(const std::string& name, const std::vector<double>& bandwidths,
243 s4u::Link::SharingPolicy policy)
245 xbt_assert(bandwidths.size() == 1, "Non WIFI link must have only 1 bandwidth.");
246 auto link = new LinkL07(name, bandwidths[0], policy, get_maxmin_system());
247 link->set_model(this);
255 kernel::resource::CpuAction* CpuL07::execution_start(double size)
257 std::vector<s4u::Host*> host_list = {get_iface()};
259 auto* flops_amount = new double[host_list.size()]();
260 flops_amount[0] = size;
262 kernel::resource::CpuAction* res =
263 static_cast<CpuL07Model*>(get_model())->hostModel_->execute_parallel(host_list, flops_amount, nullptr, -1);
264 static_cast<L07Action*>(res)->free_arrays_ = true;
268 kernel::resource::CpuAction* CpuL07::sleep(double duration)
270 auto* action = static_cast<L07Action*>(execution_start(1.0));
271 action->set_max_duration(duration);
272 action->set_suspend_state(kernel::resource::Action::SuspendStates::SLEEPING);
273 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
278 bool CpuL07::is_used() const
280 return get_model()->get_maxmin_system()->constraint_used(get_constraint());
283 /** @brief take into account changes of speed (either load or max) */
284 void CpuL07::on_speed_change()
286 const kernel::lmm::Element* elem = nullptr;
288 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(), speed_.peak * speed_.scale);
289 while (const auto* var = get_constraint()->get_variable(&elem)) {
290 const kernel::resource::Action* action = var->get_id();
292 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), speed_.scale * speed_.peak);
295 Cpu::on_speed_change();
298 LinkL07::LinkL07(const std::string& name, double bandwidth, s4u::Link::SharingPolicy policy,
299 kernel::lmm::System* system)
302 this->set_constraint(system->constraint_new(this, bandwidth));
303 bandwidth_.peak = bandwidth;
305 if (policy == s4u::Link::SharingPolicy::FATPIPE)
306 get_constraint()->unshare();
309 bool LinkL07::is_used() const
311 return get_model()->get_maxmin_system()->constraint_used(get_constraint());
314 void CpuL07::apply_event(kernel::profile::Event* triggered, double value)
316 XBT_DEBUG("Updating cpu %s (%p) with value %g", get_cname(), this, value);
317 if (triggered == speed_.event) {
318 speed_.scale = value;
320 tmgr_trace_event_unref(&speed_.event);
322 } else if (triggered == state_event_) {
325 XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
326 get_iface()->turn_on();
329 get_iface()->turn_off();
330 tmgr_trace_event_unref(&state_event_);
333 xbt_die("Unknown event!\n");
337 void LinkL07::apply_event(kernel::profile::Event* triggered, double value)
339 XBT_DEBUG("Updating link %s (%p) with value=%f", get_cname(), this, value);
340 if (triggered == bandwidth_.event) {
341 set_bandwidth(value);
342 tmgr_trace_event_unref(&bandwidth_.event);
344 } else if (triggered == latency_.event) {
346 tmgr_trace_event_unref(&latency_.event);
348 } else if (triggered == state_event_) {
353 tmgr_trace_event_unref(&state_event_);
356 xbt_die("Unknown event ! \n");
360 void LinkL07::set_bandwidth(double value)
362 bandwidth_.peak = value;
363 LinkImpl::on_bandwidth_change();
365 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(), bandwidth_.peak * bandwidth_.scale);
368 kernel::resource::LinkImpl* LinkL07::set_latency(double value)
370 latency_check(value);
371 const kernel::lmm::Element* elem = nullptr;
373 latency_.peak = value;
374 while (const auto* var = get_constraint()->get_variable(&elem)) {
375 auto* action = static_cast<L07Action*>(var->get_id());
376 action->updateBound();
380 LinkL07::~LinkL07() = default;
386 L07Action::~L07Action()
389 delete[] computationAmount_;
390 delete[] communicationAmount_;
394 void L07Action::updateBound()
396 double lat_current = 0.0;
398 size_t host_count = hostList_.size();
400 if (communicationAmount_ != nullptr) {
401 for (size_t i = 0; i < host_count; i++) {
402 for (size_t j = 0; j < host_count; j++) {
403 if (communicationAmount_[i * host_count + j] > 0) {
405 std::vector<kernel::resource::LinkImpl*> route;
406 hostList_.at(i)->route_to(hostList_.at(j), route, &lat);
408 lat_current = std::max(lat_current, lat * communicationAmount_[i * host_count + j]);
413 double lat_bound = kernel::resource::NetworkModel::cfg_tcp_gamma / (2.0 * lat_current);
414 XBT_DEBUG("action (%p) : lat_bound = %g", this, lat_bound);
415 if ((latency_ <= 0.0) && is_running()) {
417 get_model()->get_maxmin_system()->update_variable_bound(get_variable(), lat_bound);
419 get_model()->get_maxmin_system()->update_variable_bound(get_variable(), std::min(rate_, lat_bound));
424 } // namespace simgrid