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/* Copyright (c) 2017-2025. 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 demonstrates how to create a variable load for tasks.
*
* We consider the following graph:
*
* comm -> exec
*
* With a small load each comm task is followed by an exec task.
* With a heavy load there is a burst of comm before the exec task can even finish once.
*/
#include "simgrid/s4u.hpp"
XBT_LOG_NEW_DEFAULT_CATEGORY(task_variable_load, "Messages specific for this s4u example");
namespace sg4 = simgrid::s4u;
static void variable_load(sg4::TaskPtr t)
{
XBT_INFO("--- Small load ---");
for (int i = 0; i < 3; i++) {
t->enqueue_firings(1);
sg4::this_actor::sleep_for(100);
}
sg4::this_actor::sleep_until(1000);
XBT_INFO("--- Heavy load ---");
for (int i = 0; i < 3; i++) {
t->enqueue_firings(1);
sg4::this_actor::sleep_for(1);
}
}
int main(int argc, char* argv[])
{
sg4::Engine e(&argc, argv);
e.load_platform(argv[1]);
// Retreive hosts
auto* tremblay = e.host_by_name("Tremblay");
auto* jupiter = e.host_by_name("Jupiter");
// Create tasks
auto comm = sg4::CommTask::init("comm", 1e7, tremblay, jupiter);
auto exec = sg4::ExecTask::init("exec", 1e9, jupiter);
// Create the graph by defining dependencies between tasks
comm->add_successor(exec);
// Add a function to be called when tasks end for log purpose
sg4::Task::on_completion_cb(
[](const sg4::Task* t) { XBT_INFO("Task %s finished (%d)", t->get_name().c_str(), t->get_count()); });
// Create the actor that will inject load during the simulation
tremblay->add_actor("input", variable_load, comm);
// Start the simulation
e.run();
return 0;
}
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