+++ /dev/null
-/* Copyright (c) 2014-2023. 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/kernel/routing/NetPoint.hpp>
-
-#include "simgrid/sg_config.hpp"
-#include "src/kernel/EngineImpl.hpp"
-#include "src/kernel/activity/CommImpl.hpp"
-#include "src/surf/HostImpl.hpp"
-#include "src/surf/network_ib.hpp"
-
-#include <boost/algorithm/string/classification.hpp>
-#include <boost/algorithm/string/split.hpp>
-
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_network);
-
-/*********
- * Model *
- *********/
-
-/************************************************************************/
-/* New model based on MPI contention model for Infiniband platforms */
-/************************************************************************/
-/* @Inproceedings{mescal_vienne_phd, */
-/* author={Jérôme Vienne}, */
-/* title={prédiction de performances d’applications de calcul haute performance sur réseau Infiniband}, */
-/* address={Grenoble FRANCE}, */
-/* month=june, */
-/* year={2010} */
-/* } */
-SIMGRID_REGISTER_NETWORK_MODEL(
- IB,
- "Realistic network model specifically tailored for HPC settings, with Infiniband contention model as described in "
- "http://mescal.imag.fr/membres/jean-marc.vincent/index.html/PhD/Vienne.pdf",
- []() {
- using simgrid::kernel::resource::NetworkIBModel;
-
- auto net_model = std::make_shared<NetworkIBModel>("Network_IB");
- auto* engine = simgrid::kernel::EngineImpl::get_instance();
- engine->add_model(net_model);
- engine->get_netzone_root()->set_network_model(net_model);
-
- simgrid::s4u::Link::on_communication_state_change_cb(NetworkIBModel::IB_action_state_changed_callback);
- simgrid::kernel::activity::CommImpl::on_start.connect(NetworkIBModel::IB_comm_start_callback);
- simgrid::s4u::Host::on_creation_cb(NetworkIBModel::IB_create_host_callback);
- simgrid::config::set_default<double>("network/weight-S", 8775);
- });
-
-namespace simgrid::kernel::resource {
-
-void NetworkIBModel::IB_create_host_callback(s4u::Host const& host)
-{
- static int id = 0;
- auto* ibModel = static_cast<NetworkIBModel*>(host.get_netpoint()->get_englobing_zone()->get_network_model().get());
- ibModel->active_nodes.try_emplace(host.get_name(), id);
- id++;
-}
-
-void NetworkIBModel::IB_action_state_changed_callback(NetworkAction& action, Action::State /*previous*/)
-{
- if (action.get_state() != Action::State::FINISHED)
- return;
- auto* ibModel = static_cast<NetworkIBModel*>(action.get_model());
- auto [src, dst] = ibModel->active_comms[&action];
-
- XBT_DEBUG("IB callback - action %p finished", &action);
- ibModel->update_IB_factors(&action, src, dst, 1);
- ibModel->active_comms.erase(&action);
-}
-
-void NetworkIBModel::IB_comm_start_callback(const activity::CommImpl& comm)
-{
- auto* action = static_cast<NetworkAction*>(comm.surf_action_);
- auto* ibModel = static_cast<NetworkIBModel*>(action->get_model());
- auto* act_src = &ibModel->active_nodes.at(action->get_src().get_name());
- auto* act_dst = &ibModel->active_nodes.at(action->get_dst().get_name());
-
- ibModel->active_comms[action] = std::make_pair(act_src, act_dst);
- ibModel->update_IB_factors(action, act_src, act_dst, 0);
-}
-
-NetworkIBModel::NetworkIBModel(const std::string& name) : NetworkCm02Model(name)
-{
- std::string IB_factors_string = config::get_value<std::string>("smpi/IB-penalty-factors");
- std::vector<std::string> radical_elements;
- boost::split(radical_elements, IB_factors_string, boost::is_any_of(";"));
-
- xbt_assert(radical_elements.size() == 3, "smpi/IB-penalty-factors should be provided and contain 3 "
- "elements, semi-colon separated. Example: 0.965;0.925;1.35");
-
- try {
- Be_ = std::stod(radical_elements.front());
- } catch (const std::invalid_argument& ia) {
- throw std::invalid_argument(std::string("First part of smpi/IB-penalty-factors is not numerical:") + ia.what());
- }
-
- try {
- Bs_ = std::stod(radical_elements.at(1));
- } catch (const std::invalid_argument& ia) {
- throw std::invalid_argument(std::string("Second part of smpi/IB-penalty-factors is not numerical:") + ia.what());
- }
-
- try {
- ys_ = std::stod(radical_elements.back());
- } catch (const std::invalid_argument& ia) {
- throw std::invalid_argument(std::string("Third part of smpi/IB-penalty-factors is not numerical:") + ia.what());
- }
-}
-
-void NetworkIBModel::compute_IB_factors(IBNode* root) const
-{
- size_t num_comm_out = root->active_comms_up_.size();
- double max_penalty_out = 0.0;
- // first, compute all outbound penalties to get their max
- for (ActiveComm const* comm : root->active_comms_up_) {
- double my_penalty_out = 1.0;
-
- if (num_comm_out != 1) {
- if (comm->destination->nb_active_comms_down_ > 2) // number of comms sent to the receiving node
- my_penalty_out = num_comm_out * Bs_ * ys_;
- else
- my_penalty_out = num_comm_out * Bs_;
- }
-
- max_penalty_out = std::max(max_penalty_out, my_penalty_out);
- }
-
- for (ActiveComm* comm : root->active_comms_up_) {
- // compute inbound penalty
- double my_penalty_in = 1.0;
- if (comm->destination->nb_active_comms_down_ != 1) // total number of incoming comms
- my_penalty_in = (comm->destination->active_comms_down_)[root] // number of comm sent to dest by root node
- * Be_ * comm->destination->active_comms_down_.size(); // number of different nodes sending to dest
-
- double penalty = std::max(my_penalty_in, max_penalty_out);
-
- double rate_before_update = comm->action->get_bound();
- // save initial rate of the action
- if (comm->init_rate == -1)
- comm->init_rate = rate_before_update;
-
- double penalized_bw = num_comm_out ? comm->init_rate / penalty : comm->init_rate;
-
- if (not double_equals(penalized_bw, rate_before_update, sg_precision_timing)) {
- XBT_DEBUG("%d->%d action %p penalty updated : bw now %f, before %f , initial rate %f", root->id_,
- comm->destination->id_, comm->action, penalized_bw, comm->action->get_bound(), comm->init_rate);
- get_maxmin_system()->update_variable_bound(comm->action->get_variable(), penalized_bw);
- } else {
- XBT_DEBUG("%d->%d action %p penalty not updated : bw %f, initial rate %f", root->id_, comm->destination->id_,
- comm->action, penalized_bw, comm->init_rate);
- }
- }
- XBT_DEBUG("Finished computing IB penalties");
-}
-
-void NetworkIBModel::update_IB_factors_rec(IBNode* root, std::vector<bool>& updatedlist) const
-{
- if (not updatedlist[root->id_]) {
- XBT_DEBUG("IB - Updating rec %d", root->id_);
- compute_IB_factors(root);
- updatedlist[root->id_] = true;
- for (ActiveComm const* comm : root->active_comms_up_) {
- if (not updatedlist[comm->destination->id_])
- update_IB_factors_rec(comm->destination, updatedlist);
- }
- for (auto const& [comm, _] : root->active_comms_down_) {
- if (not updatedlist[comm->id_])
- update_IB_factors_rec(comm, updatedlist);
- }
- }
-}
-
-void NetworkIBModel::update_IB_factors(NetworkAction* action, IBNode* from, IBNode* to, int remove) const
-{
- if (from == to) // disregard local comms (should use loopback)
- return;
-
- if (remove) {
- if (to->active_comms_down_[from] == 1)
- to->active_comms_down_.erase(from);
- else
- to->active_comms_down_[from] -= 1;
-
- to->nb_active_comms_down_--;
- if (auto it = std::find_if(begin(from->active_comms_up_), end(from->active_comms_up_),
- [action](const ActiveComm* comm) { return comm->action == action; });
- it != std::end(from->active_comms_up_)) {
- delete *it;
- from->active_comms_up_.erase(it);
- }
- action->unref();
- } else {
- action->ref();
- auto* comm = new ActiveComm();
- comm->action = action;
- comm->destination = to;
- from->active_comms_up_.push_back(comm);
-
- to->active_comms_down_[from] += 1;
- to->nb_active_comms_down_++;
- }
- XBT_DEBUG("IB - Updating %d", from->id_);
- std::vector<bool> updated(active_nodes.size(), false);
- update_IB_factors_rec(from, updated);
- XBT_DEBUG("IB - Finished updating %d", from->id_);
-}
-} // namespace simgrid::kernel::resource
