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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 first 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 master(std::vector<std::string> args)
{
xbt_assert(args.size() == 5, "The master function expects 4 arguments");
long workers_count = std::stol(args[1]);
long tasks_count = std::stol(args[2]);
double compute_cost = std::stod(args[3]);
double communication_cost = std::stod(args[4]);
XBT_INFO("Got %ld workers and %ld tasks to process", workers_count, tasks_count);
for (int i = 0; i < tasks_count; i++) { /* For each task to be executed: */
/* - Select a worker in a round-robin way */
std::string worker_rank = std::to_string(i % workers_count);
std::string mailbox_name = "worker-" + worker_rank;
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 (int i = 0; i < workers_count; i++) {
/* The workers stop when receiving a negative compute_cost */
std::string mailbox_name = "worker-" + std::to_string(i);
simgrid::s4u::Mailbox* mailbox = simgrid::s4u::Mailbox::by_name(mailbox_name);
mailbox->put(new double(-1.0), 0);
}
}
static void worker(std::vector<std::string> args)
{
xbt_assert(args.size() == 2, "The worker expects a single argument");
long id = std::stol(args[1]);
const std::string mailbox_name = "worker-" + std::to_string(id);
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.");
}
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);
e.register_function("worker", &worker);
/* 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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