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);
26 static simgrid::config::Flag<std::string> cfg_ptask_solver("host/solver",
27 "Set linear equations solver used by ptask model",
29 &simgrid::kernel::lmm::System::validate_solver);
31 /**************************************/
32 /*** Resource Creation & Destruction **/
33 /**************************************/
34 void surf_host_model_init_ptask_L07()
36 XBT_CINFO(xbt_cfg, "Switching to the L07 model to handle parallel tasks.");
37 xbt_assert(cfg_ptask_solver != "maxmin", "Invalid configuration. Cannot use maxmin solver with parallel tasks.");
39 auto* system = simgrid::kernel::lmm::System::build(cfg_ptask_solver, true /* selective update */);
40 auto host_model = std::make_shared<simgrid::kernel::resource::HostL07Model>("Host_Ptask", system);
41 auto* engine = simgrid::kernel::EngineImpl::get_instance();
42 engine->add_model(host_model);
43 engine->get_netzone_root()->set_host_model(host_model);
46 namespace simgrid::kernel::resource {
48 HostL07Model::HostL07Model(const std::string& name, lmm::System* sys) : HostModel(name)
50 set_maxmin_system(sys);
52 auto net_model = std::make_shared<NetworkL07Model>("Network_Ptask", this, sys);
53 auto engine = EngineImpl::get_instance();
54 engine->add_model(net_model);
55 engine->get_netzone_root()->set_network_model(net_model);
57 auto cpu_model = std::make_shared<CpuL07Model>("Cpu_Ptask", this, sys);
58 engine->add_model(cpu_model);
59 engine->get_netzone_root()->set_cpu_pm_model(cpu_model);
62 CpuL07Model::CpuL07Model(const std::string& name, HostL07Model* hmodel, lmm::System* sys)
63 : CpuModel(name), hostModel_(hmodel)
65 set_maxmin_system(sys);
68 CpuL07Model::~CpuL07Model()
70 set_maxmin_system(nullptr);
73 NetworkL07Model::NetworkL07Model(const std::string& name, HostL07Model* hmodel, lmm::System* sys)
74 : NetworkModel(name), hostModel_(hmodel)
76 set_maxmin_system(sys);
77 loopback_.reset(create_link("__loopback__", {simgrid::config::get_value<double>("network/loopback-bw")}));
78 loopback_->set_sharing_policy(s4u::Link::SharingPolicy::FATPIPE, {});
79 loopback_->set_latency(simgrid::config::get_value<double>("network/loopback-lat"));
80 loopback_->get_iface()->seal();
83 NetworkL07Model::~NetworkL07Model()
85 set_maxmin_system(nullptr);
88 double HostL07Model::next_occurring_event(double now)
90 double min = HostModel::next_occurring_event_full(now);
91 for (Action const& action : *get_started_action_set()) {
92 const auto& net_action = static_cast<const L07Action&>(action);
93 if (net_action.get_latency() > 0 && (min < 0 || net_action.get_latency() < min)) {
94 min = net_action.get_latency();
95 XBT_DEBUG("Updating min with %p (start %f): %f", &net_action, net_action.get_start_time(), min);
98 XBT_DEBUG("min value: %f", min);
103 void HostL07Model::update_actions_state(double /*now*/, double delta)
105 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
106 auto& action = static_cast<L07Action&>(*it);
107 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
108 if (action.get_latency() > 0) {
109 if (action.get_latency() > delta) {
110 action.update_latency(delta, sg_surf_precision);
112 action.set_latency(0.0);
114 if ((action.get_latency() <= 0.0) && (action.is_suspended() == 0)) {
115 action.updateBound();
116 get_maxmin_system()->update_variable_penalty(action.get_variable(), 1.0);
117 action.set_last_update();
120 XBT_DEBUG("Action (%p) : remains (%g) updated by %g.", &action, action.get_remains(), action.get_rate() * delta);
121 action.update_remains(action.get_rate() * delta);
122 action.update_max_duration(delta);
124 XBT_DEBUG("Action (%p) : remains (%g).", &action, action.get_remains());
126 /* In the next if cascade, the action can be finished either because:
127 * - The amount of remaining work reached 0
128 * - The max duration was reached
129 * If it's not done, it may have failed.
132 if (((action.get_remains() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
133 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
134 action.finish(Action::State::FINISHED);
138 /* Need to check that none of the model has failed */
140 const lmm::Constraint* cnst = action.get_variable()->get_constraint(i);
141 while (cnst != nullptr) {
143 if (not cnst->get_id()->is_on()) {
144 XBT_DEBUG("Action (%p) Failed!!", &action);
145 action.finish(Action::State::FAILED);
148 cnst = action.get_variable()->get_constraint(i);
153 CpuAction* HostL07Model::execute_parallel(const std::vector<s4u::Host*>& host_list, const double* flops_amount,
154 const double* bytes_amount, double rate)
156 return new L07Action(this, host_list, flops_amount, bytes_amount, rate);
159 L07Action::L07Action(Model* model, const std::vector<s4u::Host*>& host_list, const double* flops_amount,
160 const double* bytes_amount, double rate)
161 : CpuAction(model, 1.0, false), computationAmount_(flops_amount), communicationAmount_(bytes_amount), rate_(rate)
164 size_t used_host_nb = 0; /* Only the hosts with something to compute (>0 flops) are counted) */
165 double latency = 0.0;
166 this->set_last_update();
168 hostList_.insert(hostList_.end(), host_list.begin(), host_list.end());
170 if (flops_amount != nullptr)
171 used_host_nb += std::count_if(flops_amount, flops_amount + host_list.size(), [](double x) { return x > 0.0; });
173 /* Compute the number of affected resources... */
174 if (bytes_amount != nullptr) {
175 std::unordered_set<const char*> affected_links;
177 for (size_t k = 0; k < host_list.size() * host_list.size(); k++) {
178 if (bytes_amount[k] <= 0)
182 std::vector<StandardLinkImpl*> route;
183 hostList_[k / host_list.size()]->route_to(hostList_[k % host_list.size()], route, &lat);
184 latency = std::max(latency, lat);
186 for (auto const& link : route)
187 affected_links.insert(link->get_cname());
190 link_nb = affected_links.size();
193 XBT_DEBUG("Creating a parallel task (%p) with %zu hosts and %zu unique links.", this, host_list.size(), link_nb);
197 model->get_maxmin_system()->variable_new(this, 1.0, (rate > 0 ? rate : -1.0), host_list.size() + link_nb));
200 model->get_maxmin_system()->update_variable_penalty(get_variable(), 0.0);
202 /* Expand it for the CPUs even if there is nothing to compute, to make sure that it gets expended even if there is no
203 * communication either */
204 for (size_t i = 0; i < host_list.size(); i++) {
205 model->get_maxmin_system()->expand(host_list[i]->get_cpu()->get_constraint(), get_variable(),
206 (flops_amount == nullptr ? 0.0 : flops_amount[i]));
209 if (bytes_amount != nullptr) {
210 for (size_t k = 0; k < host_list.size() * host_list.size(); k++) {
211 if (bytes_amount[k] <= 0.0)
213 std::vector<StandardLinkImpl*> route;
214 hostList_[k / host_list.size()]->route_to(hostList_[k % host_list.size()], route, nullptr);
216 for (auto const& link : route)
217 model->get_maxmin_system()->expand(link->get_constraint(), this->get_variable(), bytes_amount[k]);
221 if (link_nb + used_host_nb == 0) {
223 this->set_remains(0.0);
225 /* finally calculate the initial bound value */
229 Action* NetworkL07Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
231 std::vector<s4u::Host*> host_list = {src, dst};
232 const auto* flops_amount = new double[2]();
233 auto* bytes_amount = new double[4]();
235 bytes_amount[1] = size;
237 Action* res = hostModel_->execute_parallel(host_list, flops_amount, bytes_amount, rate);
238 static_cast<L07Action*>(res)->free_arrays_ = true;
242 CpuImpl* CpuL07Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
244 return (new CpuL07(host, speed_per_pstate))->set_model(this);
247 StandardLinkImpl* NetworkL07Model::create_link(const std::string& name, const std::vector<double>& bandwidths)
249 xbt_assert(bandwidths.size() == 1, "Non WIFI link must have only 1 bandwidth.");
250 auto link = new LinkL07(name, bandwidths[0], get_maxmin_system());
251 link->set_model(this);
255 StandardLinkImpl* NetworkL07Model::create_wifi_link(const std::string& name, const std::vector<double>& bandwidths)
264 CpuAction* CpuL07::execution_start(double size, double user_bound)
266 std::vector<s4u::Host*> host_list = {get_iface()};
267 xbt_assert(user_bound <= 0, "User bound not supported by ptask model");
269 auto* flops_amount = new double[host_list.size()]();
270 flops_amount[0] = size;
273 static_cast<CpuL07Model*>(get_model())->hostModel_->execute_parallel(host_list, flops_amount, nullptr, -1);
274 static_cast<L07Action*>(res)->free_arrays_ = true;
278 CpuAction* CpuL07::sleep(double duration)
280 auto* action = static_cast<L07Action*>(execution_start(1.0, -1));
281 action->set_max_duration(duration);
282 action->set_suspend_state(Action::SuspendStates::SLEEPING);
283 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
288 /** @brief take into account changes of speed (either load or max) */
289 void CpuL07::on_speed_change()
291 const lmm::Element* elem = nullptr;
293 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(), get_core_count() * speed_.peak * speed_.scale);
295 while (const auto* var = get_constraint()->get_variable(&elem)) {
296 auto* action = static_cast<L07Action*>(var->get_id());
297 action->updateBound();
300 CpuImpl::on_speed_change();
303 LinkL07::LinkL07(const std::string& name, double bandwidth, lmm::System* system) : StandardLinkImpl(name)
305 this->set_constraint(system->constraint_new(this, bandwidth));
306 bandwidth_.peak = bandwidth;
309 void CpuL07::apply_event(profile::Event* triggered, double value)
311 XBT_DEBUG("Updating cpu %s (%p) with value %g", get_cname(), this, value);
312 if (triggered == speed_.event) {
313 speed_.scale = value;
315 tmgr_trace_event_unref(&speed_.event);
317 } else if (triggered == get_state_event()) {
320 XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
321 get_iface()->turn_on();
324 get_iface()->turn_off();
328 xbt_die("Unknown event!\n");
332 void LinkL07::apply_event(profile::Event* triggered, double value)
334 XBT_DEBUG("Updating link %s (%p) with value=%f", get_cname(), this, value);
335 if (triggered == bandwidth_.event) {
336 set_bandwidth(value);
337 tmgr_trace_event_unref(&bandwidth_.event);
339 } else if (triggered == latency_.event) {
341 tmgr_trace_event_unref(&latency_.event);
343 } else if (triggered == get_state_event()) {
350 xbt_die("Unknown event ! \n");
354 void LinkL07::set_bandwidth(double value)
356 bandwidth_.peak = value;
357 StandardLinkImpl::on_bandwidth_change();
359 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(), bandwidth_.peak * bandwidth_.scale);
362 void LinkL07::set_latency(double value)
364 latency_check(value);
365 const lmm::Element* elem = nullptr;
367 latency_.peak = value;
368 while (const auto* var = get_constraint()->get_variable(&elem)) {
369 auto* action = static_cast<L07Action*>(var->get_id());
370 action->updateBound();
373 LinkL07::~LinkL07() = default;
379 L07Action::~L07Action()
382 delete[] computationAmount_;
383 delete[] communicationAmount_;
387 double L07Action::calculateNetworkBound()
389 double lat_current = 0.0;
390 double lat_bound = std::numeric_limits<double>::max();
392 size_t host_count = hostList_.size();
394 if (communicationAmount_ == nullptr) {
398 for (size_t i = 0; i < host_count; i++) {
399 for (size_t j = 0; j < host_count; j++) {
400 if (communicationAmount_[i * host_count + j] > 0) {
402 std::vector<StandardLinkImpl*> route;
403 hostList_.at(i)->route_to(hostList_.at(j), route, &lat);
405 lat_current = std::max(lat_current, lat * communicationAmount_[i * host_count + j]);
409 if (lat_current > 0) {
410 lat_bound = NetworkModel::cfg_tcp_gamma / (2.0 * lat_current);
415 double L07Action::calculateCpuBound()
417 double cpu_bound = std::numeric_limits<double>::max();
419 if (computationAmount_ == nullptr) {
423 for (size_t i = 0; i < hostList_.size(); i++) {
424 if (computationAmount_[i] > 0) {
425 cpu_bound = std::min(cpu_bound, hostList_[i]->get_cpu()->get_speed(1.0) *
426 hostList_[i]->get_cpu()->get_speed_ratio() / computationAmount_[i]);
432 void L07Action::updateBound()
434 double bound = std::min(calculateNetworkBound(), calculateCpuBound());
436 XBT_DEBUG("action (%p) : bound = %g", this, bound);
438 /* latency has been paid (or no latency), we can set the appropriate bound for multicore or network limit */
439 if ((bound < std::numeric_limits<double>::max()) && (latency_ <= 0.0)) {
441 get_model()->get_maxmin_system()->update_variable_bound(get_variable(), bound);
443 get_model()->get_maxmin_system()->update_variable_bound(get_variable(), std::min(rate_, bound));
447 } // namespace simgrid::kernel::resource