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/* Copyright (c) 2010-2025. 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. */
/****************************************************************************
*
* This is our solution to the second lab of the S4U tutorial
* (available online at https://simgrid.frama.io/simgrid/tuto_s4u.html)
*
* Reading this further before taking the tutorial will SPOIL YOU!!!
*
****************************************************************************/
#include <simgrid/s4u.hpp>
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_app_masterworker, "Messages specific for this example");
static void worker()
{
const std::string mailbox_name = "worker-" + std::to_string(simgrid::s4u::this_actor::get_pid());
simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
double compute_cost;
do {
double* msg = mailbox->get<double>();
compute_cost = *msg;
delete msg;
if (compute_cost > 0) /* If compute_cost is valid, execute a computation of that cost */
simgrid::s4u::this_actor::execute(compute_cost);
} while (compute_cost > 0); /* Stop when receiving an invalid compute_cost */
XBT_INFO("Exiting now.");
}
static void master(std::vector<std::string> args)
{
xbt_assert(args.size() == 4, "The master function expects 3 arguments");
long tasks_count = std::stol(args[1]);
double compute_cost = std::stod(args[2]);
double communication_cost = std::stod(args[3]);
std::vector<simgrid::s4u::ActorPtr> actors;
for (auto* host : simgrid::s4u::Engine::get_instance()->get_all_hosts()) {
simgrid::s4u::ActorPtr act = simgrid::s4u::Actor::create("Worker-" + host->get_name(), host, worker);
actors.push_back(act);
}
XBT_INFO("Got %ld tasks to process", tasks_count);
for (int i = 0; i < tasks_count; i++) { /* For each task to be executed: */
/* - Select a worker in a round-robin way */
aid_t worker_pid = actors.at(i % actors.size())->get_pid();
std::string mailbox_name = "worker-" + std::to_string(worker_pid);
simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
/* - Send the computation cost to that worker */
XBT_INFO("Sending task %d of %ld to mailbox '%s'", i, tasks_count, mailbox->get_cname());
mailbox->put(new double(compute_cost), communication_cost);
}
XBT_INFO("All tasks have been dispatched. Request all workers to stop.");
for (unsigned long i = 0; i < actors.size(); i++) {
/* The workers stop when receiving a negative compute_cost */
std::string mailbox_name = "worker-" + std::to_string(actors.at(i)->get_pid());
simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
mailbox->put(new double(-1.0), 0);
}
}
int main(int argc, char* argv[])
{
simgrid::s4u::Engine e(&argc, argv);
xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
/* Register the functions representing the actors */
e.register_function("master", &master);
/* Load the platform description and then deploy the application */
e.load_platform(argv[1]);
e.load_deployment(argv[2]);
/* Run the simulation */
e.run();
XBT_INFO("Simulation is over");
return 0;
}
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