+++ /dev/null
-/* Copyright (c) 2010-2021. 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 example shows how to use simgrid::s4u::Mailbox::ready() to check for completed communications.
- *
- * We have a number of peers which send and receive messages in two phases:
- * -> sending phase: each one of them sends a number of messages to the others followed
- * by a single "finalize" message.
- * -> receiving phase: each one of them receives all the available messages that reached
- * their corresponding mailbox until it has all the needed "finalize"
- * messages to know that no more work needs to be done.
- *
- * To avoid doing a wait() over the ongoing communications, each peer makes use of the
- * simgrid::s4u::Mailbox::ready() method. If it returns true then a following get() will fetch the
- * message immediately, if not the peer will sleep for a fixed amount of time before checking again.
- *
- */
-
-#include "simgrid/s4u.hpp"
-#include <cstdlib>
-#include <iostream>
-#include <string>
-
-XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_async_ready, "Messages specific for this s4u example");
-
-static void peer(int argc, char** argv)
-{
- xbt_assert(argc == 5, "Expecting 4 parameters from the XML deployment file but got %d", argc);
- int my_id = std::stoi(argv[1]); /* - my id */
- long messages_count = std::stol(argv[2]); /* - number of message */
- long msg_size = std::stol(argv[3]); /* - message size in bytes */
- long peers_count = std::stol(argv[4]); /* - number of peers */
-
- /* Set myself as the persistent receiver of my mailbox so that messages start flowing to me as soon as they are put
- * into it */
- simgrid::s4u::Mailbox* my_mbox = simgrid::s4u::Mailbox::by_name(std::string("peer-") + std::to_string(my_id));
- my_mbox->set_receiver(simgrid::s4u::Actor::self());
-
- std::vector<simgrid::s4u::CommPtr> pending_comms;
-
- /* Start dispatching all messages to peers others that myself */
- for (int i = 0; i < messages_count; i++) {
- for (int peer_id = 0; peer_id < peers_count; peer_id++) {
- if (peer_id != my_id) {
- std::string mboxName = std::string("peer-") + std::to_string(peer_id);
- simgrid::s4u::Mailbox* mbox = simgrid::s4u::Mailbox::by_name(mboxName);
- std::string msgName =
- std::string("Message ") + std::to_string(i) + std::string(" from peer ") + std::to_string(my_id);
- auto* payload = new std::string(msgName); // copy the data we send:
- // 'msgName' is not a stable storage location
- XBT_INFO("Send '%s' to '%s'", msgName.c_str(), mboxName.c_str());
- /* Create a communication representing the ongoing communication */
- pending_comms.push_back(mbox->put_async(payload, msg_size));
- }
- }
- }
-
- /* Start sending messages to let peers know that they should stop */
- for (int peer_id = 0; peer_id < peers_count; peer_id++) {
- if (peer_id != my_id) {
- std::string mboxName = std::string("peer-") + std::to_string(peer_id);
- simgrid::s4u::Mailbox* mbox = simgrid::s4u::Mailbox::by_name(mboxName);
- auto* payload = new std::string("finalize"); // Make a copy of the data we will send
- pending_comms.push_back(mbox->put_async(payload, msg_size));
- XBT_INFO("Send 'finalize' to 'peer-%d'", peer_id);
- }
- }
- XBT_INFO("Done dispatching all messages");
-
- /* Retrieve all the messages other peers have been sending to me until I receive all the corresponding "Finalize"
- * messages */
- long pending_finalize_messages = peers_count - 1;
- while (pending_finalize_messages > 0) {
- if (my_mbox->ready()) {
- double start = simgrid::s4u::Engine::get_clock();
- auto received = my_mbox->get_unique<std::string>();
- double waiting_time = simgrid::s4u::Engine::get_clock() - start;
- xbt_assert(
- waiting_time == 0,
- "Expecting the waiting time to be 0 because the communication was supposedly ready, but got %f instead",
- waiting_time);
- XBT_INFO("I got a '%s'.", received->c_str());
- if (*received == "finalize") {
- pending_finalize_messages--;
- }
- } else {
- XBT_INFO("Nothing ready to consume yet, I better sleep for a while");
- simgrid::s4u::this_actor::sleep_for(.01);
- }
- }
-
- XBT_INFO("I'm done, just waiting for my peers to receive the messages before exiting");
- simgrid::s4u::Comm::wait_all(&pending_comms);
-
- XBT_INFO("Goodbye now!");
-}
-
-int main(int argc, char* argv[])
-{
- xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
-
- simgrid::s4u::Engine e(&argc, argv);
- e.register_function("peer", &peer);
-
- e.load_platform(argv[1]);
- e.load_deployment(argv[2]);
-
- e.run();
-
- return 0;
-}
