SimGrid  3.18
Versatile Simulation of Distributed Systems
examples/s4u/app-masterworker/s4u-app-masterworker.cpp
/* Copyright (c) 2010-2017. 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. */
#include "xbt/sysdep.h"
#include <simgrid/s4u.hpp>
#include <string>
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_app_masterworker, "Messages specific for this s4u example");
class Master {
long number_of_tasks = 0; /* - Number of tasks */
double comp_size = 0; /* - Task compute cost */
double comm_size = 0; /* - Task communication size */
long workers_count = 0; /* - Number of workers */
simgrid::s4u::MailboxPtr mailbox = nullptr;
public:
explicit Master(std::vector<std::string> args)
{
xbt_assert(args.size() == 5, "The master function expects 4 arguments from the XML deployment file");
number_of_tasks = std::stol(args[1]);
comp_size = std::stod(args[2]);
comm_size = std::stod(args[3]);
workers_count = std::stol(args[4]);
XBT_INFO("Got %ld workers and %ld tasks to process", workers_count, number_of_tasks);
}
void operator()()
{
for (int i = 0; i < number_of_tasks; i++) { /* For each task to be executed: */
/* - Select a @ref worker in a round-robin way */
mailbox = simgrid::s4u::Mailbox::byName(std::string("worker-") + std::to_string(i % workers_count));
if (number_of_tasks < 10000 || i % 10000 == 0)
XBT_INFO("Sending \"%s\" (of %ld) to mailbox \"%s\"", (std::string("Task_") + std::to_string(i)).c_str(),
number_of_tasks, mailbox->getCname());
/* - Send the computation amount to the @ref worker */
mailbox->put(new double(comp_size), comm_size);
}
XBT_INFO("All tasks have been dispatched. Let's tell everybody the computation is over.");
for (int i = 0; i < workers_count; i++) {
/* - Eventually tell all the workers to stop by sending a "finalize" task */
mailbox = simgrid::s4u::Mailbox::byName(std::string("worker-") + std::to_string(i % workers_count));
mailbox->put(new double(-1.0), 0);
}
}
};
class Worker {
long id = -1;
simgrid::s4u::MailboxPtr mailbox = nullptr;
public:
explicit Worker(std::vector<std::string> args)
{
xbt_assert(args.size() == 2, "The worker expects a single argument from the XML deployment file: "
"its worker ID (its numerical rank)");
id = std::stol(args[1]);
}
void operator()()
{
while (1) { /* The worker waits in an infinite loop for tasks sent by the \ref master */
double* task = static_cast<double*>(mailbox->get());
xbt_assert(task != nullptr, "mailbox->get() failed");
double comp_size = *task;
delete task;
if (comp_size < 0) { /* - Exit when -1.0 is received */
XBT_INFO("I'm done. See you!");
break;
}
/* - Otherwise, process the task */
}
}
};
int main(int argc, char* argv[])
{
simgrid::s4u::Engine e(&argc, argv);
xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n"
"\tExample: %s msg_platform.xml msg_deployment.xml\n",
argv[0], argv[0]);
e.loadPlatform(argv[1]); /** - Load the platform description */
e.registerFunction<Master>("master");
e.registerFunction<Worker>("worker"); /** - Register the function to be executed by the processes */
e.loadDeployment(argv[2]); /** - Deploy the application */
e.run(); /** - Run the simulation */
XBT_INFO("Simulation time %g", e.getClock());
return 0;
}