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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.*;
public class dag_simple {
public static void main(String[] args)
{
Engine e = new Engine(args);
e.load_platform(args[0]);
e.track_vetoed_activities();
var fafard = e.host_by_name("Fafard");
// Display the details on vetoed activities
Exec.on_veto_cb(new CallbackExec() {
public void run(Exec exec)
{
Engine.info("Execution '%s' vetoed. Dependencies: %s; Ressources: %s", exec.get_name(),
(exec.dependencies_solved() ? "solved" : "NOT solved"),
(exec.is_assigned() ? "assigned" : "NOT assigned"));
}
});
Exec.on_completion_cb(new CallbackExec() {
public void run(Exec exec)
{
Engine.info("Execution '%s' is complete (start time: %f, finish time: %f)", exec.get_name(),
exec.get_start_time(), exec.get_finish_time());
}
});
// Define an amount of work that should take 1 second to execute.
double computation_amount = fafard.get_speed();
// Create a small DAG: Two parents and a child
Exec first_parent = Exec.init();
Exec second_parent = Exec.init();
Exec child = Exec.init();
first_parent.add_successor(child);
second_parent.add_successor(child);
// Set the parameters (the name is for logging purposes only)
// + First parent ends after 1 second and the Second parent after 2 seconds.
first_parent.set_name("parent 1").set_flops_amount(computation_amount);
second_parent.set_name("parent 2").set_flops_amount(2 * computation_amount);
child.set_name("child").set_flops_amount(computation_amount);
// Only the parents are scheduled so far
first_parent.set_host(fafard);
second_parent.set_host(fafard);
// Start all activities that can actually start.
first_parent.start();
second_parent.start();
child.start();
while (child.get_state() != Activity.State.FINISHED) {
e.run();
var vetoed = e.get_vetoed_activities();
for (var a : vetoed) {
var exec = (Exec)a;
// In this simple case, we just assign the child task to a resource when its dependencies are solved
if (exec.dependencies_solved() && !exec.is_assigned()) {
Engine.info("Activity %s's dependencies are resolved. Let's assign it to Fafard.", exec.get_name());
exec.set_host(fafard);
} else {
Engine.info("Activity %s not ready.", exec.get_name());
}
}
e.clear_vetoed_activities(); // DON'T FORGET TO CLEAR this set between two calls to run
}
Engine.info("Simulation ends.");
// 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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