1 /* Copyright (c) 2010-2023. 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 /****************************************************************************
8 * This is our solution to the second lab of the S4U tutorial
9 * (available online at https://simgrid.frama.io/simgrid/tuto_s4u.html)
11 * Reading this further before taking the tutorial will SPOIL YOU!!!
13 ****************************************************************************/
15 #include <simgrid/s4u.hpp>
17 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_app_masterworker, "Messages specific for this example");
21 const std::string mailbox_name = "worker-" + std::to_string(simgrid::s4u::this_actor::get_pid());
22 simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
26 double* msg = mailbox->get<double>();
30 if (compute_cost > 0) /* If compute_cost is valid, execute a computation of that cost */
31 simgrid::s4u::this_actor::execute(compute_cost);
32 } while (compute_cost > 0); /* Stop when receiving an invalid compute_cost */
34 XBT_INFO("Exiting now.");
37 static void master(std::vector<std::string> args)
39 xbt_assert(args.size() == 4, "The master function expects 3 arguments");
41 long tasks_count = std::stol(args[1]);
42 double compute_cost = std::stod(args[2]);
43 double communication_cost = std::stod(args[3]);
45 std::vector<simgrid::s4u::ActorPtr> actors;
47 for (auto* host : simgrid::s4u::Engine::get_instance()->get_all_hosts()) {
48 simgrid::s4u::ActorPtr act = simgrid::s4u::Actor::create("Worker-" + host->get_name(), host, worker);
49 actors.push_back(act);
52 XBT_INFO("Got %ld tasks to process", tasks_count);
54 for (int i = 0; i < tasks_count; i++) { /* For each task to be executed: */
55 /* - Select a worker in a round-robin way */
56 aid_t worker_pid = actors.at(i % actors.size())->get_pid();
57 std::string mailbox_name = "worker-" + std::to_string(worker_pid);
58 simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
60 /* - Send the computation cost to that worker */
61 XBT_INFO("Sending task %d of %ld to mailbox '%s'", i, tasks_count, mailbox->get_cname());
62 mailbox->put(new double(compute_cost), communication_cost);
65 XBT_INFO("All tasks have been dispatched. Request all workers to stop.");
66 for (unsigned long i = 0; i < actors.size(); i++) {
67 /* The workers stop when receiving a negative compute_cost */
68 std::string mailbox_name = "worker-" + std::to_string(actors.at(i)->get_pid());
69 simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
71 mailbox->put(new double(-1.0), 0);
75 int main(int argc, char* argv[])
77 simgrid::s4u::Engine e(&argc, argv);
78 xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
80 /* Register the functions representing the actors */
81 e.register_function("master", &master);
83 /* Load the platform description and then deploy the application */
84 e.load_platform(argv[1]);
85 e.load_deployment(argv[2]);
87 /* Run the simulation */
90 XBT_INFO("Simulation is over");