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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. */
#include "simgrid/plugins/load.h"
#include "simgrid/s4u.hpp"
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_test, "Messages specific for this s4u example");
namespace sg4 = simgrid::s4u;
static void execute_load_test()
{
s4u_Host* host = sg4::Host::by_name("MyHost1");
XBT_INFO("Initial peak speed: %.0E flop/s; number of flops computed so far: %.0E (should be 0) and current average "
"load: %.5f (should be 0)",
host->get_speed(), sg_host_get_computed_flops(host), sg_host_get_avg_load(host));
double start = sg4::Engine::get_clock();
XBT_INFO("Sleep for 10 seconds");
sg4::this_actor::sleep_for(10);
double speed = host->get_speed();
XBT_INFO("Done sleeping %.2fs; peak speed: %.0E flop/s; number of flops computed so far: %.0E (nothing should have "
"changed)",
sg4::Engine::get_clock() - start, host->get_speed(), sg_host_get_computed_flops(host));
// Run an activity
start = sg4::Engine::get_clock();
XBT_INFO("Run an activity of %.0E flops at current speed of %.0E flop/s", 200E6, host->get_speed());
sg4::this_actor::execute(200E6);
XBT_INFO(
"Done working on my activity; this took %.2fs; current peak speed: %.0E flop/s (when I started the computation, "
"the speed was set to %.0E flop/s); number of flops computed so "
"far: %.2E, average load as reported by the HostLoad plugin: %.5f (should be %.5f)",
sg4::Engine::get_clock() - start, host->get_speed(), speed, sg_host_get_computed_flops(host),
sg_host_get_avg_load(host),
200E6 / (10.5 * speed * host->get_core_count() +
(sg4::Engine::get_clock() - start - 0.5) * host->get_speed() * host->get_core_count()));
// ========= Change power peak =========
int pstate = 1;
host->set_pstate(pstate);
XBT_INFO(
"========= Requesting pstate %d (speed should be of %.0E flop/s and is of %.0E flop/s, average load is %.5f)",
pstate, host->get_pstate_speed(pstate), host->get_speed(), sg_host_get_avg_load(host));
// Run a second activity
start = sg4::Engine::get_clock();
XBT_INFO("Run an activity of %.0E flops", 100E6);
sg4::this_actor::execute(100E6);
XBT_INFO("Done working on my activity; this took %.2fs; current peak speed: %.0E flop/s; number of flops computed so "
"far: %.2E",
sg4::Engine::get_clock() - start, host->get_speed(), sg_host_get_computed_flops(host));
start = sg4::Engine::get_clock();
XBT_INFO("========= Requesting a reset of the computation and load counters");
sg_host_load_reset(host);
XBT_INFO("After reset: %.0E flops computed; load is %.5f", sg_host_get_computed_flops(host),
sg_host_get_avg_load(host));
XBT_INFO("Sleep for 4 seconds");
sg4::this_actor::sleep_for(4);
XBT_INFO("Done sleeping %.2f s; peak speed: %.0E flop/s; number of flops computed so far: %.0E",
sg4::Engine::get_clock() - start, host->get_speed(), sg_host_get_computed_flops(host));
// =========== Turn the other host off ==========
s4u_Host* host2 = sg4::Host::by_name("MyHost2");
XBT_INFO("Turning MyHost2 off, and sleeping another 10 seconds. MyHost2 computed %.0f flops so far and has an "
"average load of %.5f.",
sg_host_get_computed_flops(host2), sg_host_get_avg_load(host2));
host2->turn_off();
start = sg4::Engine::get_clock();
sg4::this_actor::sleep_for(10);
XBT_INFO("Done sleeping %.2f s; peak speed: %.0E flop/s; number of flops computed so far: %.0E",
sg4::Engine::get_clock() - start, host->get_speed(), sg_host_get_computed_flops(host));
}
static void change_speed()
{
s4u_Host* host = sg4::Host::by_name("MyHost1");
sg4::this_actor::sleep_for(10.5);
XBT_INFO("I slept until now, but now I'll change the speed of this host "
"while the other actor is still computing! This should slow the computation down.");
host->set_pstate(2);
}
int main(int argc, char* argv[])
{
sg_host_load_plugin_init();
sg4::Engine e(&argc, argv);
xbt_assert(argc == 2, "Usage: %s platform_file\n\tExample: %s ../platforms/energy_platform.xml\n", argv[0], argv[0]);
e.load_platform(argv[1]);
e.add_actor("load_test", e.host_by_name("MyHost1"), execute_load_test);
e.add_actor("change_speed", e.host_by_name("MyHost1"), change_speed);
e.run();
XBT_INFO("Total simulation time: %.2f", sg4::Engine::get_clock());
return 0;
}
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