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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. */
#include <simgrid/s4u.hpp>
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_exec_thread, "Messages specific for this s4u example");
namespace sg4 = simgrid::s4u;
static void runner()
{
const auto* e = sg4::Engine::get_instance();
sg4::Host* multicore_host = e->host_by_name("MyHost1");
// First test with less than, same number as, and more threads than cores
double start_time = sg4::Engine::get_clock();
sg4::this_actor::thread_execute(multicore_host, 1e9, 2);
XBT_INFO("Computed 2-thread activity on a 4-core host. Took %g s", e->get_clock() - start_time);
start_time = sg4::Engine::get_clock();
sg4::this_actor::thread_execute(multicore_host, 1e9, 4);
XBT_INFO("Computed 4-thread activity on a 4-core host. Took %g s", e->get_clock() - start_time);
start_time = sg4::Engine::get_clock();
sg4::this_actor::thread_execute(multicore_host, 1e9, 6);
XBT_INFO("Computed 6-thread activity on a 4-core host. Took %g s", e->get_clock() - start_time);
simgrid::s4u::ExecPtr background_task = sg4::this_actor::exec_async(2.5e9);
XBT_INFO("Start a 1-core background task on the 4-core host.");
start_time = sg4::Engine::get_clock();
sg4::this_actor::thread_execute(multicore_host, 1e9, 2);
XBT_INFO("Computed 2-thread activity on a 4-core host. Took %g s", e->get_clock() - start_time);
start_time = sg4::Engine::get_clock();
sg4::this_actor::thread_execute(multicore_host, 1e9, 4);
XBT_INFO("Computed 4-thread activity on a 4-core host. Took %g s", e->get_clock() - start_time);
background_task->wait();
XBT_INFO("The background task has ended.");
background_task = sg4::this_actor::exec_init(2e9)->set_thread_count(4)->start();
XBT_INFO("Start a 4-core background task on the 4-core host.");
XBT_INFO("Sleep for 5 seconds before starting another competing task");
sg4::this_actor::sleep_for(5);
start_time = sg4::Engine::get_clock();
sg4::this_actor::execute(1e9);
XBT_INFO("Computed 1-thread activity on a 4-core host. Took %g s", e->get_clock() - start_time);
background_task->wait();
XBT_INFO("The background task has ended.");
}
int main(int argc, char* argv[])
{
sg4::Engine e(&argc, argv);
xbt_assert(argc == 2, "Usage: %s <platform file>", argv[0]);
e.load_platform(argv[1]);
e.add_actor("test", e.host_by_name("MyHost1"), runner);
e.run();
XBT_INFO("Simulation done.");
return 0;
}
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