+++ /dev/null
-/* Copyright (c) 2019-2021. 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 "network_wifi.hpp"
-#include "simgrid/s4u/Host.hpp"
-#include "src/surf/surf_interface.hpp"
-
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_network);
-
-namespace simgrid {
-namespace kernel {
-namespace resource {
-
-/************
- * Resource *
- ************/
-
-NetworkWifiLink::NetworkWifiLink(const std::string& name, const std::vector<double>& bandwidths, lmm::System* system)
- : LinkImpl(name)
-{
- this->set_constraint(system->constraint_new(this, 1));
- for (auto bandwidth : bandwidths)
- bandwidths_.push_back({bandwidth, 1.0, nullptr});
-}
-
-void NetworkWifiLink::set_host_rate(const s4u::Host* host, int rate_level)
-{
- auto insert_done = host_rates_.insert(std::make_pair(host->get_name(), rate_level));
- if (not insert_done.second)
- insert_done.first->second = rate_level;
-
- // Each time we add a host, we refresh the decay model
- refresh_decay_bandwidths();
-}
-
-double NetworkWifiLink::get_host_rate(const s4u::Host* host) const
-{
- auto host_rates_it = host_rates_.find(host->get_name());
-
- if (host_rates_it == host_rates_.end())
- return -1;
-
- int rate_id = host_rates_it->second;
- xbt_assert(rate_id >= 0,
- "Negative host wifi rate levels are invalid but host '%s' uses %d as a rate level on link '%s'",
- host->get_cname(), rate_id, this->get_cname());
- xbt_assert(rate_id < (int)bandwidths_.size(),
- "Link '%s' only has %zu wifi rate levels, so the provided level %d is invalid for host '%s'.",
- this->get_cname(), bandwidths_.size(), rate_id, host->get_cname());
-
- Metric rate = use_decay_model_ ? decay_bandwidths_[rate_id] : bandwidths_[rate_id];
- return rate.peak * rate.scale;
-}
-
-s4u::Link::SharingPolicy NetworkWifiLink::get_sharing_policy() const
-{
- return s4u::Link::SharingPolicy::WIFI;
-}
-
-int NetworkWifiLink::get_host_count() const
-{
- return static_cast<int>(host_rates_.size());
-}
-
-void NetworkWifiLink::refresh_decay_bandwidths(){
- // Compute number of STAtion on the Access Point
- int nSTA = get_host_count();
-
- std::vector<Metric> new_bandwidths;
- for (auto const& bandwidth : bandwidths_) {
- // Instantiate decay model relatively to the actual bandwidth
- double max_bw=bandwidth.peak;
- double min_bw=bandwidth.peak-(wifi_max_rate_-wifi_min_rate_);
- double model_rate=bandwidth.peak-(wifi_max_rate_-model_rate_);
-
- xbt_assert(min_bw > 0, "Your WIFI link is using bandwidth(s) which is too low for the decay model.");
-
- double N0=max_bw-min_bw;
- double lambda=(-log(model_rate-min_bw)+log(N0))/model_n_;
- // Since decay model start at 0 we should use (nSTA-1)
- double new_peak=N0*exp(-lambda*(nSTA-1))+min_bw;
- new_bandwidths.push_back({new_peak, 1.0, nullptr});
- }
- decay_bandwidths_=new_bandwidths;
-}
-
-bool NetworkWifiLink::toggle_decay_model(){
- use_decay_model_ = not use_decay_model_;
- return use_decay_model_;
-}
-
-void NetworkWifiLink::set_latency(double value)
-{
- xbt_assert(value == 0, "Latency cannot be set for WiFi Links.");
-}
-} // namespace resource
-} // namespace kernel
-} // namespace simgrid
