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/* Copyright (c) 2007-2025. 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. */
import org.simgrid.s4u.*;;
class Pinger extends Actor {
Mailbox mailboxIn;
Mailbox mailboxOut;
public Pinger(Mailbox mailboxIn, Mailbox mailboxOut)
{
this.mailboxIn = mailboxIn;
this.mailboxOut = mailboxOut;
}
@Override public void run() throws SimgridException
{
Engine.info("Ping from mailbox " + mailboxIn.get_name() + " to mailbox " + mailboxOut.get_name());
/* - Do the ping with a 1-Byte payload (latency bound) ... */
Double payload = Engine.get_clock();
mailboxOut.put(payload, 1);
/* - ... then wait for the (large) pong */
Double sender_time = (Double)mailboxIn.get();
double communication_time = Engine.get_clock() - sender_time;
Engine.info("Payload received : large communication (bandwidth bound)");
Engine.info("Pong time (bandwidth bound): "+ communication_time);
}
}
class Ponger extends Actor {
Mailbox mailboxIn;
Mailbox mailboxOut;
public Ponger(Mailbox mailboxIn, Mailbox mailboxOut)
{
this.mailboxIn = mailboxIn;
this.mailboxOut = mailboxOut;
}
@Override public void run() throws SimgridException
{
Engine.info("Pong from mailbox " + mailboxIn.get_name() + " to mailbox " + mailboxOut.get_name());
/* - Receive the (small) ping first ....*/
Double senderTime = (Double)mailboxIn.get();
double communicationTime = Engine.get_clock() - senderTime;
Engine.info("Payload received : small communication (latency bound)");
Engine.info("Ping time (latency bound) " + communicationTime);
/* - ... Then send a 1GB pong back (bandwidth bound) */
Double payload = Engine.get_clock();
Engine.info("payload = " + payload);
mailboxOut.put(payload, (long)1e9);
}
}
public class comm_pingpong {
public static void main(String[] args) {
Engine e = new Engine(args);
e.load_platform(args[0]);
Mailbox mb1 = e.mailbox_by_name("Mailbox 1");
Mailbox mb2 = e.mailbox_by_name("Mailbox 2");
e.host_by_name("Tremblay").add_actor("pinger", new Pinger(mb1, mb2));
e.host_by_name("Jupiter").add_actor("ponger", new Ponger(mb2, mb1));
e.run();
Engine.info("The simulation is terminating.");
// 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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