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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 example shows how to serialize a set of communications going through a link using Link::set_concurrency_limit()
*
* This example is very similar to the other asynchronous communication examples, but messages get serialized by the
* platform. Without this call to Link::set_concurrency_limit(2) in main, all messages would be received at the exact
* same timestamp since they are initiated at the same instant and are of the same size. But with this extra
* configuration to the link, at most 2 messages can travel through the link at the same time.
*/
import org.simgrid.s4u.*;
class Sender extends Actor {
int messages_count; /* - number of messages */
int msg_size; /* - message size in bytes */
Sender(int size, int count)
{
this.messages_count = count;
this.msg_size = size;
}
public void run() throws SimgridException
{
/* ActivitySet in which we store all ongoing communications */
ActivitySet pending_comms = new ActivitySet();
/* Mailbox to use */
Mailbox mbox = get_engine().mailbox_by_name("receiver");
/* Start dispatching all messages to receiver */
for (int i = 0; i < messages_count; i++) {
String msg_content = "Message " + i;
// Copy the data we send: the 'msg_content' variable is not a stable storage location.
// It will be destroyed when this actor leaves the loop, ie before the receiver gets it
var payload = new String(msg_content);
Engine.info("Send '%s' to '%s'", msg_content, mbox.get_name());
/* Create a communication representing the ongoing communication, and store it in pending_comms */
Comm comm = mbox.put_async(payload, msg_size);
pending_comms.push(comm);
}
Engine.info("Done dispatching all messages");
/* Now that all message exchanges were initiated, wait for their completion in one single call */
pending_comms.await_all();
Engine.info("Goodbye now!");
}
}
/* Receiver actor expects 1 argument: number of messages to be received */
class Receiver extends Actor {
Mailbox mbox;
int messages_count = 10; /* - number of messages */
Receiver(int count) { messages_count = count; }
public void run() throws SimgridException
{
mbox = get_engine().mailbox_by_name("receiver");
/* Where we store all incoming msgs */
ActivitySet pending_comms = new ActivitySet();
Engine.info("Wait for %d messages asynchronously", messages_count);
for (int i = 0; i < messages_count; i++) {
var comm = mbox.get_async();
pending_comms.push(comm);
}
while (!pending_comms.empty()) {
var completed_one = pending_comms.await_any();
if (completed_one != null) {
var comm = (Comm)completed_one;
var msg = comm.get_payload();
Engine.info("I got '%s'.", msg);
}
}
}
};
public class platform_comm_serialize {
public static void main(String[] args)
{
Engine e = new Engine(args);
/* Creates the platform
* ________ __________
* | Sender |===============| Receiver |
* |________| Link1 |__________|
*/
var zone = e.get_netzone_root();
var sender = zone.add_host("sender", 1);
var receiver = zone.add_host("receiver", 1);
/* create split-duplex link1 (UP/DOWN), limiting the number of concurrent flows in it for 2 */
var link = zone.add_split_duplex_link("link1", 10e9).set_latency(10e-6).set_concurrency_limit(2);
/* create routes between nodes */
zone.add_route(sender, receiver, new Link[] {link});
zone.seal();
/* create actors Sender/Receiver */
receiver.add_actor("receiver", new Receiver(10));
sender.add_actor("sender", new Sender((int)1e6, 10));
e.run();
// The following call is useless in your code, but our continuous integration uses it to track memleaks
e.force_garbage_collection();
}
}
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