1 /* Copyright (c) 2010-2018. 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 /* This example shows how to block on the completion of a set of communications.
8 * As for the other asynchronous examples, the sender initiate all the messages it wants to send and
9 * pack the resulting simgrid::s4u::CommPtr objects in a vector. All messages thus occurs concurrently.
11 * The sender then blocks until all ongoing communication terminate, using simgrid::s4u::Comm::wait_all()
15 #include "simgrid/s4u.hpp"
20 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_async_waitall, "Messages specific for this s4u example");
23 long messages_count; /* - number of tasks */
24 long receivers_count; /* - number of receivers */
25 double msg_size; /* - communication cost in bytes */
28 explicit Sender(std::vector<std::string> args)
30 xbt_assert(args.size() == 4, "Expecting 3 parameters from the XML deployment file but got %zu", args.size());
31 messages_count = std::stol(args[1]);
32 msg_size = std::stod(args[2]);
33 receivers_count = std::stol(args[3]);
37 std::vector<simgrid::s4u::CommPtr> pending_comms;
39 /* Start dispatching all messages to receivers, in a round robin fashion */
40 for (int i = 0; i < messages_count; i++) {
42 std::string mboxName = std::string("receiver-") + std::to_string(i % receivers_count);
43 simgrid::s4u::MailboxPtr mbox = simgrid::s4u::Mailbox::by_name(mboxName);
44 std::string msgName = std::string("Message ") + std::to_string(i);
45 std::string* payload = new std::string(msgName); // copy the data we send:
46 // 'msgName' is not a stable storage location
47 XBT_INFO("Send '%s' to '%s'", msgName.c_str(), mboxName.c_str());
48 /* Create a communication representing the ongoing communication */
49 simgrid::s4u::CommPtr comm = mbox->put_async(payload, msg_size);
50 /* Add this comm to the vector of all known comms */
51 pending_comms.push_back(comm);
54 /* Start sending messages to let the workers know that they should stop */
55 for (int i = 0; i < receivers_count; i++) {
56 std::string mboxName = std::string("receiver-") + std::to_string(i % receivers_count);
57 simgrid::s4u::MailboxPtr mbox = simgrid::s4u::Mailbox::by_name(mboxName);
58 std::string* payload = new std::string("finalize"); // Make a copy of the data we will send
60 simgrid::s4u::CommPtr comm = mbox->put_async(payload, 0);
61 pending_comms.push_back(comm);
62 XBT_INFO("Send 'finalize' to 'receiver-%ld'", i % receivers_count);
64 XBT_INFO("Done dispatching all messages");
66 /* Now that all message exchanges were initiated, wait for their completion in one single call */
67 simgrid::s4u::Comm::wait_all(&pending_comms);
69 XBT_INFO("Goodbye now!");
73 /* Receiver actor expects 1 argument: its ID */
75 simgrid::s4u::MailboxPtr mbox;
78 explicit Receiver(std::vector<std::string> args)
80 xbt_assert(args.size() == 2, "Expecting one parameter from the XML deployment file but got %zu", args.size());
81 std::string mboxName = std::string("receiver-") + args[1];
82 mbox = simgrid::s4u::Mailbox::by_name(mboxName);
86 XBT_INFO("Wait for my first message");
87 for (bool cont = true; cont;) {
88 std::string* received = static_cast<std::string*>(mbox->get());
89 XBT_INFO("I got a '%s'.", received->c_str());
90 cont = (*received != "finalize"); // If it's a finalize message, we're done
91 // Receiving the message was all we were supposed to do
97 int main(int argc, char *argv[])
99 xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
101 simgrid::s4u::Engine e(&argc, argv);
102 e.register_actor<Sender>("sender");
103 e.register_actor<Receiver>("receiver");
105 e.load_platform(argv[1]);
106 e.load_deployment(argv[2]);