1 /* Copyright (c) 2007-2022. 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/kernel/routing/NetZoneImpl.hpp>
7 #include <simgrid/s4u/Engine.hpp>
8 #include <xbt/config.hpp>
10 #include "simgrid/config.h"
11 #include "src/kernel/EngineImpl.hpp"
12 #if SIMGRID_HAVE_EIGEN3
13 #include "src/kernel/lmm/bmf.hpp"
15 #include "src/kernel/resource/profile/Event.hpp"
16 #include "src/surf/ptask_L07.hpp"
18 #include <unordered_set>
20 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_host);
21 XBT_LOG_EXTERNAL_CATEGORY(xbt_cfg);
23 /**************************************/
24 /*** Resource Creation & Destruction **/
25 /**************************************/
26 void surf_host_model_init_ptask_L07()
28 XBT_CINFO(xbt_cfg, "Switching to the L07 model to handle parallel tasks.");
30 auto* system = simgrid::kernel::lmm::System::build("fairbottleneck", true /* selective update */);
31 auto host_model = std::make_shared<simgrid::kernel::resource::HostL07Model>("Host_Ptask", system);
32 auto* engine = simgrid::kernel::EngineImpl::get_instance();
33 engine->add_model(host_model);
34 engine->get_netzone_root()->set_host_model(host_model);
37 void surf_host_model_init_ptask_BMF()
39 #if SIMGRID_HAVE_EIGEN3
40 XBT_CINFO(xbt_cfg, "Switching to the BMF model to handle parallel tasks.");
42 bool select = simgrid::config::get_value<bool>("bmf/selective-update");
43 auto* system = simgrid::kernel::lmm::System::build("bmf", select);
44 auto host_model = std::make_shared<simgrid::kernel::resource::HostL07Model>("Host_Ptask", system);
45 auto* engine = simgrid::kernel::EngineImpl::get_instance();
46 engine->add_model(host_model);
47 engine->get_netzone_root()->set_host_model(host_model);
49 xbt_die("Cannot use the BMF ptask model without installing Eigen3.");
57 HostL07Model::HostL07Model(const std::string& name, lmm::System* sys) : HostModel(name)
59 set_maxmin_system(sys);
61 auto net_model = std::make_shared<NetworkL07Model>("Network_Ptask", this, sys);
62 auto engine = EngineImpl::get_instance();
63 engine->add_model(net_model);
64 engine->get_netzone_root()->set_network_model(net_model);
66 auto cpu_model = std::make_shared<CpuL07Model>("Cpu_Ptask", this, sys);
67 engine->add_model(cpu_model);
68 engine->get_netzone_root()->set_cpu_pm_model(cpu_model);
71 CpuL07Model::CpuL07Model(const std::string& name, HostL07Model* hmodel, lmm::System* sys)
72 : CpuModel(name), hostModel_(hmodel)
74 set_maxmin_system(sys);
77 CpuL07Model::~CpuL07Model()
79 set_maxmin_system(nullptr);
82 NetworkL07Model::NetworkL07Model(const std::string& name, HostL07Model* hmodel, lmm::System* sys)
83 : NetworkModel(name), hostModel_(hmodel)
85 set_maxmin_system(sys);
86 loopback_ = create_link("__loopback__", {simgrid::config::get_value<double>("network/loopback-bw")});
87 loopback_->set_sharing_policy(s4u::Link::SharingPolicy::FATPIPE, {});
88 loopback_->set_latency(simgrid::config::get_value<double>("network/loopback-lat"));
92 NetworkL07Model::~NetworkL07Model()
94 set_maxmin_system(nullptr);
97 double HostL07Model::next_occurring_event(double now)
99 double min = HostModel::next_occurring_event_full(now);
100 for (Action const& action : *get_started_action_set()) {
101 const auto& net_action = static_cast<const L07Action&>(action);
102 if (net_action.get_latency() > 0 && (min < 0 || net_action.get_latency() < min)) {
103 min = net_action.get_latency();
104 XBT_DEBUG("Updating min with %p (start %f): %f", &net_action, net_action.get_start_time(), min);
107 XBT_DEBUG("min value: %f", min);
112 void HostL07Model::update_actions_state(double /*now*/, double delta)
114 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
115 auto& action = static_cast<L07Action&>(*it);
116 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
117 if (action.get_latency() > 0) {
118 if (action.get_latency() > delta) {
119 action.update_latency(delta, sg_surf_precision);
121 action.set_latency(0.0);
123 if ((action.get_latency() <= 0.0) && (action.is_suspended() == 0)) {
124 action.updateBound();
125 get_maxmin_system()->update_variable_penalty(action.get_variable(), 1.0);
126 action.set_last_update();
129 XBT_DEBUG("Action (%p) : remains (%g) updated by %g.", &action, action.get_remains(), action.get_rate() * delta);
130 action.update_remains(action.get_rate() * delta);
131 action.update_max_duration(delta);
133 XBT_DEBUG("Action (%p) : remains (%g).", &action, action.get_remains());
135 /* In the next if cascade, the action can be finished either because:
136 * - The amount of remaining work reached 0
137 * - The max duration was reached
138 * If it's not done, it may have failed.
141 if (((action.get_remains() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
142 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
143 action.finish(Action::State::FINISHED);
147 /* Need to check that none of the model has failed */
149 const lmm::Constraint* cnst = action.get_variable()->get_constraint(i);
150 while (cnst != nullptr) {
152 const Resource* constraint_id = cnst->get_id();
153 if (not constraint_id->is_on()) {
154 XBT_DEBUG("Action (%p) Failed!!", &action);
155 action.finish(Action::State::FAILED);
158 cnst = action.get_variable()->get_constraint(i);
163 CpuAction* HostL07Model::execute_parallel(const std::vector<s4u::Host*>& host_list, const double* flops_amount,
164 const double* bytes_amount, double rate)
166 return new L07Action(this, host_list, flops_amount, bytes_amount, rate);
169 L07Action::L07Action(Model* model, const std::vector<s4u::Host*>& host_list, const double* flops_amount,
170 const double* bytes_amount, double rate)
171 : CpuAction(model, 1.0, false), computationAmount_(flops_amount), communicationAmount_(bytes_amount), rate_(rate)
174 size_t used_host_nb = 0; /* Only the hosts with something to compute (>0 flops) are counted) */
175 double latency = 0.0;
176 this->set_last_update();
178 hostList_.insert(hostList_.end(), host_list.begin(), host_list.end());
180 if (flops_amount != nullptr)
181 used_host_nb += std::count_if(flops_amount, flops_amount + host_list.size(), [](double x) { return x > 0.0; });
183 /* Compute the number of affected resources... */
184 if (bytes_amount != nullptr) {
185 std::unordered_set<const char*> affected_links;
187 for (size_t k = 0; k < host_list.size() * host_list.size(); k++) {
188 if (bytes_amount[k] <= 0)
192 std::vector<StandardLinkImpl*> route;
193 hostList_[k / host_list.size()]->route_to(hostList_[k % host_list.size()], route, &lat);
194 latency = std::max(latency, lat);
196 for (auto const& link : route)
197 affected_links.insert(link->get_cname());
200 link_nb = affected_links.size();
203 XBT_DEBUG("Creating a parallel task (%p) with %zu hosts and %zu unique links.", this, host_list.size(), link_nb);
207 model->get_maxmin_system()->variable_new(this, 1.0, (rate > 0 ? rate : -1.0), host_list.size() + link_nb));
210 model->get_maxmin_system()->update_variable_penalty(get_variable(), 0.0);
212 /* Expand it for the CPUs even if there is nothing to compute, to make sure that it gets expended even if there is no
213 * communication either */
214 for (size_t i = 0; i < host_list.size(); i++) {
215 model->get_maxmin_system()->expand_add(host_list[i]->get_cpu()->get_constraint(), get_variable(),
216 (flops_amount == nullptr ? 0.0 : flops_amount[i]));
219 if (bytes_amount != nullptr) {
220 for (size_t k = 0; k < host_list.size() * host_list.size(); k++) {
221 if (bytes_amount[k] <= 0.0)
223 std::vector<StandardLinkImpl*> route;
224 hostList_[k / host_list.size()]->route_to(hostList_[k % host_list.size()], route, nullptr);
226 for (auto const& link : route)
227 model->get_maxmin_system()->expand_add(link->get_constraint(), this->get_variable(), bytes_amount[k]);
231 if (link_nb + used_host_nb == 0) {
233 this->set_remains(0.0);
235 /* finally calculate the initial bound value */
239 Action* NetworkL07Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
241 std::vector<s4u::Host*> host_list = {src, dst};
242 const auto* flops_amount = new double[2]();
243 auto* bytes_amount = new double[4]();
245 bytes_amount[1] = size;
247 Action* res = hostModel_->execute_parallel(host_list, flops_amount, bytes_amount, rate);
248 static_cast<L07Action*>(res)->free_arrays_ = true;
252 CpuImpl* CpuL07Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
254 return (new CpuL07(host, speed_per_pstate))->set_model(this);
257 StandardLinkImpl* NetworkL07Model::create_link(const std::string& name, const std::vector<double>& bandwidths)
259 xbt_assert(bandwidths.size() == 1, "Non WIFI link must have only 1 bandwidth.");
260 auto link = new LinkL07(name, bandwidths[0], get_maxmin_system());
261 link->set_model(this);
265 StandardLinkImpl* NetworkL07Model::create_wifi_link(const std::string& name, const std::vector<double>& bandwidths)
274 CpuAction* CpuL07::execution_start(double size, double user_bound)
276 std::vector<s4u::Host*> host_list = {get_iface()};
277 xbt_assert(user_bound <= 0, "User bound not supported by ptask model");
279 auto* flops_amount = new double[host_list.size()]();
280 flops_amount[0] = size;
283 static_cast<CpuL07Model*>(get_model())->hostModel_->execute_parallel(host_list, flops_amount, nullptr, -1);
284 static_cast<L07Action*>(res)->free_arrays_ = true;
288 CpuAction* CpuL07::sleep(double duration)
290 auto* action = static_cast<L07Action*>(execution_start(1.0, -1));
291 action->set_max_duration(duration);
292 action->set_suspend_state(Action::SuspendStates::SLEEPING);
293 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
298 /** @brief take into account changes of speed (either load or max) */
299 void CpuL07::on_speed_change()
301 const lmm::Element* elem = nullptr;
303 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(), get_core_count() * speed_.peak * speed_.scale);
305 while (const auto* var = get_constraint()->get_variable(&elem)) {
306 auto* action = static_cast<L07Action*>(var->get_id());
307 action->updateBound();
310 CpuImpl::on_speed_change();
313 LinkL07::LinkL07(const std::string& name, double bandwidth, lmm::System* system) : StandardLinkImpl(name)
315 this->set_constraint(system->constraint_new(this, bandwidth));
316 bandwidth_.peak = bandwidth;
319 void CpuL07::apply_event(profile::Event* triggered, double value)
321 XBT_DEBUG("Updating cpu %s (%p) with value %g", get_cname(), this, value);
322 if (triggered == speed_.event) {
323 speed_.scale = value;
325 tmgr_trace_event_unref(&speed_.event);
327 } else if (triggered == get_state_event()) {
330 XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
331 get_iface()->turn_on();
334 get_iface()->turn_off();
338 xbt_die("Unknown event!\n");
342 void LinkL07::apply_event(profile::Event* triggered, double value)
344 XBT_DEBUG("Updating link %s (%p) with value=%f", get_cname(), this, value);
345 if (triggered == bandwidth_.event) {
346 set_bandwidth(value);
347 tmgr_trace_event_unref(&bandwidth_.event);
349 } else if (triggered == latency_.event) {
351 tmgr_trace_event_unref(&latency_.event);
353 } else if (triggered == get_state_event()) {
360 xbt_die("Unknown event ! \n");
364 void LinkL07::set_bandwidth(double value)
366 bandwidth_.peak = value;
367 StandardLinkImpl::on_bandwidth_change();
369 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(), bandwidth_.peak * bandwidth_.scale);
372 void LinkL07::set_latency(double value)
374 latency_check(value);
375 const lmm::Element* elem = nullptr;
377 latency_.peak = value;
378 while (const auto* var = get_constraint()->get_variable(&elem)) {
379 auto* action = static_cast<L07Action*>(var->get_id());
380 action->updateBound();
383 LinkL07::~LinkL07() = default;
389 L07Action::~L07Action()
392 delete[] computationAmount_;
393 delete[] communicationAmount_;
397 double L07Action::calculateNetworkBound()
399 double lat_current = 0.0;
400 double lat_bound = std::numeric_limits<double>::max();
402 size_t host_count = hostList_.size();
404 if (communicationAmount_ == nullptr) {
408 for (size_t i = 0; i < host_count; i++) {
409 for (size_t j = 0; j < host_count; j++) {
410 if (communicationAmount_[i * host_count + j] > 0) {
412 std::vector<StandardLinkImpl*> route;
413 hostList_.at(i)->route_to(hostList_.at(j), route, &lat);
415 lat_current = std::max(lat_current, lat * communicationAmount_[i * host_count + j]);
419 if (lat_current > 0) {
420 lat_bound = NetworkModel::cfg_tcp_gamma / (2.0 * lat_current);
425 double L07Action::calculateCpuBound()
427 double cpu_bound = std::numeric_limits<double>::max();
429 if (computationAmount_ == nullptr) {
433 for (size_t i = 0; i < hostList_.size(); i++) {
434 if (computationAmount_[i] > 0) {
435 cpu_bound = std::min(cpu_bound, hostList_[i]->get_cpu()->get_speed(1.0) *
436 hostList_[i]->get_cpu()->get_speed_ratio() / computationAmount_[i]);
442 void L07Action::updateBound()
444 double bound = std::min(calculateNetworkBound(), calculateCpuBound());
446 XBT_DEBUG("action (%p) : bound = %g", this, bound);
448 /* latency has been paid (or no latency), we can set the appropriate bound for multicore or network limit */
449 if ((bound < std::numeric_limits<double>::max()) && (latency_ <= 0.0)) {
451 get_model()->get_maxmin_system()->update_variable_bound(get_variable(), bound);
453 get_model()->get_maxmin_system()->update_variable_bound(get_variable(), std::min(rate_, bound));
457 } // namespace resource
458 } // namespace kernel
459 } // namespace simgrid