1 /* Copyright (c) 2017-2018. 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. */
7 #include <simgrid/s4u.hpp>
9 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_engine_filtering, "Messages specific for this s4u example");
12 class FrequencyChanged {
13 std::map<simgrid::s4u::Host*, int> host_list;
16 explicit FrequencyChanged(simgrid::s4u::Engine& e)
18 std::vector<simgrid::s4u::Host*> list = e.get_all_hosts();
19 for (auto& host : list) {
20 host_list.insert({host, host->get_pstate()});
24 bool operator()(simgrid::s4u::Host* host) { return host->get_pstate() != host_list.at(host); }
26 double get_old_speed(simgrid::s4u::Host* host) { return host_list.at(host); }
30 bool operator()(simgrid::s4u::Host* host) { return host->get_core_count() == 1; }
33 bool filter_speed_more_than_50Mf(simgrid::s4u::Host* host);
34 bool filter_speed_more_than_50Mf(simgrid::s4u::Host* host)
36 return host->getSpeed() > 50E6;
39 int main(int argc, char* argv[])
41 simgrid::s4u::Engine e(&argc, argv);
42 e.load_platform(argv[1]);
45 * Use a lambda function to filter hosts: We only want multicore hosts
47 XBT_INFO("Hosts currently registered with this engine: %zu", e.get_host_count());
48 std::vector<simgrid::s4u::Host*> list =
49 e.get_filtered_hosts([](simgrid::s4u::Host* host) { return host->get_core_count() > 1; });
51 for (auto& host : list)
52 XBT_INFO("The following hosts have more than one core: %s", host->get_cname());
54 xbt_assert(list.size() == 1);
57 * Use a function object (functor) without memory
59 list = e.get_filtered_hosts(filter::SingleCore());
61 for (auto& host : list)
62 XBT_INFO("The following hosts are SingleCore: %s", host->get_cname());
65 * This just shows how to use a function object that uses
68 XBT_INFO("A simple example: Let's retrieve all hosts that changed their frequency");
69 filter::FrequencyChanged filter(e);
70 e.host_by_name("MyHost2")->set_pstate(2);
71 list = e.get_filtered_hosts(filter);
73 for (auto& host : list)
74 XBT_INFO("The following hosts changed their frequency: %s (from %.1ff to %.1ff)", host->get_cname(), host->getPstateSpeed(filter.get_old_speed(host)), host->getSpeed());
77 * You can also just use any normal function (namespaced as well, if you want) to filter
79 list = e.get_filtered_hosts(filter::filter_speed_more_than_50Mf);
81 for (auto& host : list)
82 XBT_INFO("The following hosts have a frequency > 50Mf: %s", host->get_cname());