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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 mailbox_in;
Mailbox mailbox_out;
public Pinger(Mailbox mailbox_in, Mailbox mailbox_out)
{
this.mailbox_in = mailbox_in;
this.mailbox_out = mailbox_out;
}
@Override public void run() throws SimgridException
{
Engine.info("Ping from mailbox "+mailbox_in.get_name()+" to mailbox "+mailbox_out.get_name());
/* - Do the ping with a 1-Byte payload (latency bound) ... */
Double payload = Engine.get_clock();
mailbox_out.put(payload, 1);
/* - ... then wait for the (large) pong */
Double sender_time = (Double)mailbox_in.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 mailbox_in;
Mailbox mailbox_out;
public Ponger(Mailbox mailbox_in, Mailbox mailbox_out)
{
this.mailbox_in = mailbox_in;
this.mailbox_out = mailbox_out;
}
@Override public void run() throws SimgridException
{
Engine.info("Pong from mailbox "+mailbox_in.get_name()+" to mailbox "+mailbox_out.get_name());
/* - Receive the (small) ping first ....*/
Double sender_time = (Double)mailbox_in.get();
double communication_time = Engine.get_clock() - sender_time;
Engine.info("Payload received : small communication (latency bound)");
Engine.info("Ping time (latency bound) " + communication_time);
/* - ... Then send a 1GB pong back (bandwidth bound) */
Double payload = Engine.get_clock();
Engine.info("payload = " + payload);
mailbox_out.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.add_actor("pinger", e.host_by_name("Tremblay"), new Pinger(mb1, mb2));
e.add_actor("ponger", e.host_by_name("Jupiter"), new Ponger(mb2, mb1));
e.run();
Engine.info("The simulation is terminating.");
}
}
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