1 /* Copyright (c) 2010-2021. 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 first 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");
19 static void master(std::vector<std::string> args)
21 xbt_assert(args.size() == 5, "The master function expects 4 arguments");
23 long workers_count = std::stol(args[1]);
24 long tasks_count = std::stol(args[2]);
25 double compute_cost = std::stod(args[3]);
26 double communication_cost = std::stod(args[4]);
28 XBT_INFO("Got %ld workers and %ld tasks to process", workers_count, tasks_count);
30 for (int i = 0; i < tasks_count; i++) { /* For each task to be executed: */
31 /* - Select a worker in a round-robin way */
32 std::string worker_rank = std::to_string(i % workers_count);
33 std::string mailbox_name = std::string("worker-") + worker_rank;
34 simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
36 /* - Send the computation cost to that worker */
37 XBT_INFO("Sending task %d of %ld to mailbox '%s'", i, tasks_count, mailbox->get_cname());
38 mailbox->put(new double(compute_cost), communication_cost);
41 XBT_INFO("All tasks have been dispatched. Request all workers to stop.");
42 for (int i = 0; i < workers_count; i++) {
43 /* The workers stop when receiving a negative compute_cost */
44 std::string mailbox_name = std::string("worker-") + std::to_string(i);
45 simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
47 mailbox->put(new double(-1.0), 0);
51 static void worker(std::vector<std::string> args)
53 xbt_assert(args.size() == 2, "The worker expects a single argument");
54 long id = std::stol(args[1]);
56 const std::string mailbox_name = std::string("worker-") + std::to_string(id);
57 simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
61 double* msg = mailbox->get<double>();
65 if (compute_cost > 0) /* If compute_cost is valid, execute a computation of that cost */
66 simgrid::s4u::this_actor::execute(compute_cost);
67 } while (compute_cost > 0); /* Stop when receiving an invalid compute_cost */
69 XBT_INFO("Exiting now.");
72 int main(int argc, char* argv[])
74 simgrid::s4u::Engine e(&argc, argv);
75 xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
77 /* Register the functions representing the actors */
78 e.register_function("master", &master);
79 e.register_function("worker", &worker);
81 /* Load the platform description and then deploy the application */
82 e.load_platform(argv[1]);
83 e.load_deployment(argv[2]);
85 /* Run the simulation */
88 XBT_INFO("Simulation is over");