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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/actor.h"
#include "simgrid/engine.h"
#include "simgrid/host.h"
#include "simgrid/plugins/load.h"
#include "xbt/asserts.h"
#include "xbt/log.h"
XBT_LOG_NEW_DEFAULT_CATEGORY(hostload_test, "Messages specific for this example");
static void execute_load_test(int argc, char* argv[])
{
sg_host_t host = sg_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)",
sg_host_get_speed(host), sg_host_get_computed_flops(host), sg_host_get_avg_load(host));
double start = simgrid_get_clock();
XBT_INFO("Sleep for 10 seconds");
sg_actor_sleep_for(10);
double speed = sg_host_get_speed(host);
XBT_INFO("Done sleeping %.2fs; peak speed: %.0E flop/s; number of flops computed so far: %.0E (nothing should have "
"changed)",
simgrid_get_clock() - start, sg_host_get_speed(host), sg_host_get_computed_flops(host));
// Run a task
start = simgrid_get_clock();
XBT_INFO("Run a task of %.0E flops at current speed of %.0E flop/s", 200e6, sg_host_get_speed(host));
sg_actor_execute(200e6);
XBT_INFO("Done working on my task; 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)",
simgrid_get_clock() - start, sg_host_get_speed(host), speed, sg_host_get_computed_flops(host),
sg_host_get_avg_load(host),
200E6 / (10.5 * speed * sg_host_core_count(host) +
(simgrid_get_clock() - start - 0.5) * sg_host_get_speed(host) * sg_host_core_count(host)));
// ========= Change power peak =========
int pstate = 1;
sg_host_set_pstate(host, pstate);
XBT_INFO(
"========= Requesting pstate %d (speed should be of %.0E flop/s and is of %.0E flop/s, average load is %.5f)",
pstate, sg_host_get_pstate_speed(host, pstate), sg_host_get_speed(host), sg_host_get_avg_load(host));
// Run a second task
start = simgrid_get_clock();
XBT_INFO("Run a task of %.0E flops", 100e6);
sg_actor_execute(100e6);
XBT_INFO("Done working on my task; this took %.2fs; current peak speed: %.0E flop/s; number of flops computed so "
"far: %.2E",
simgrid_get_clock() - start, sg_host_get_speed(host), sg_host_get_computed_flops(host));
start = simgrid_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");
sg_actor_sleep_for(4);
XBT_INFO("Done sleeping %.2f s; peak speed: %.0E flop/s; number of flops computed so far: %.0E",
simgrid_get_clock() - start, sg_host_get_speed(host), sg_host_get_computed_flops(host));
// =========== Turn the other host off ==========
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(sg_host_by_name("MyHost2")), sg_host_get_avg_load(sg_host_by_name("MyHost2")));
sg_host_turn_off(sg_host_by_name("MyHost2"));
start = simgrid_get_clock();
sg_actor_sleep_for(10);
XBT_INFO("Done sleeping %.2f s; peak speed: %.0E flop/s; number of flops computed so far: %.0E",
simgrid_get_clock() - start, sg_host_get_speed(host), sg_host_get_computed_flops(host));
}
static void change_speed(int argc, char* argv[])
{
sg_host_t host = sg_host_by_name("MyHost1");
sg_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.");
sg_host_set_pstate(host, 2);
}
int main(int argc, char* argv[])
{
sg_host_load_plugin_init();
simgrid_init(&argc, argv);
xbt_assert(argc == 2, "Usage: %s platform_file\n\tExample: %s platform.xml\n", argv[0], argv[0]);
simgrid_load_platform(argv[1]);
sg_actor_create("load_test", sg_host_by_name("MyHost1"), &execute_load_test, 0, NULL);
sg_actor_create("change_speed", sg_host_by_name("MyHost1"), &change_speed, 0, NULL);
simgrid_run();
XBT_INFO("Total simulation time: %.2f", simgrid_get_clock());
return 0;
}
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