1 /* Copyright (c) 2007-2018. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "simgrid/s4u.hpp"
7 #include "simgrid/plugins/load.h"
9 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_test, "Messages specific for this s4u example");
11 static void execute_load_test()
13 s4u_Host* host = simgrid::s4u::Host::by_name("MyHost1");
15 XBT_INFO("Initial peak speed: %.0E flop/s; number of flops computed so far: %.0E (should be 0) and current average "
16 "load: %.5f (should be 0)",
17 host->get_speed(), sg_host_get_computed_flops(host), sg_host_get_avg_load(host));
19 double start = simgrid::s4u::Engine::get_clock();
20 XBT_INFO("Sleep for 10 seconds");
21 simgrid::s4u::this_actor::sleep_for(10);
23 double speed = host->get_speed();
24 XBT_INFO("Done sleeping %.2fs; peak speed: %.0E flop/s; number of flops computed so far: %.0E (nothing should have "
26 simgrid::s4u::Engine::get_clock() - start, host->get_speed(), sg_host_get_computed_flops(host));
29 start = simgrid::s4u::Engine::get_clock();
30 XBT_INFO("Run a task of %.0E flops at current speed of %.0E flop/s", 200E6, host->get_speed());
31 simgrid::s4u::this_actor::execute(200E6);
33 XBT_INFO("Done working on my task; this took %.2fs; current peak speed: %.0E flop/s (when I started the computation, "
34 "the speed was set to %.0E flop/s); number of flops computed so "
35 "far: %.2E, average load as reported by the HostLoad plugin: %.5f (should be %.5f)",
36 simgrid::s4u::Engine::get_clock() - start, host->get_speed(), speed, sg_host_get_computed_flops(host),
37 sg_host_get_avg_load(host),
38 static_cast<double>(200E6) /
39 (10.5 * speed * host->get_core_count() +
40 (simgrid::s4u::Engine::get_clock() - start - 0.5) * host->get_speed() * host->get_core_count()));
42 // ========= Change power peak =========
44 host->set_pstate(pstate);
46 "========= Requesting pstate %d (speed should be of %.0E flop/s and is of %.0E flop/s, average load is %.5f)",
47 pstate, host->get_pstate_speed(pstate), host->get_speed(), sg_host_get_avg_load(host));
50 start = simgrid::s4u::Engine::get_clock();
51 XBT_INFO("Run a task of %.0E flops", 100E6);
52 simgrid::s4u::this_actor::execute(100E6);
53 XBT_INFO("Done working on my task; this took %.2fs; current peak speed: %.0E flop/s; number of flops computed so "
55 simgrid::s4u::Engine::get_clock() - start, host->get_speed(), sg_host_get_computed_flops(host));
57 start = simgrid::s4u::Engine::get_clock();
58 XBT_INFO("========= Requesting a reset of the computation and load counters");
59 sg_host_load_reset(host);
60 XBT_INFO("After reset: %.0E flops computed; load is %.5f", sg_host_get_computed_flops(host), sg_host_get_avg_load(host));
61 XBT_INFO("Sleep for 4 seconds");
62 simgrid::s4u::this_actor::sleep_for(4);
63 XBT_INFO("Done sleeping %.2f s; peak speed: %.0E flop/s; number of flops computed so far: %.0E",
64 simgrid::s4u::Engine::get_clock() - start, host->get_speed(), sg_host_get_computed_flops(host));
66 // =========== Turn the other host off ==========
67 s4u_Host* host2 = simgrid::s4u::Host::by_name("MyHost2");
68 XBT_INFO("Turning MyHost2 off, and sleeping another 10 seconds. MyHost2 computed %.0f flops so far and has an average load of %.5f.",
69 sg_host_get_computed_flops(host2), sg_host_get_avg_load(host2));
71 start = simgrid::s4u::Engine::get_clock();
72 simgrid::s4u::this_actor::sleep_for(10);
73 XBT_INFO("Done sleeping %.2f s; peak speed: %.0E flop/s; number of flops computed so far: %.0E",
74 simgrid::s4u::Engine::get_clock() - start, host->get_speed(), sg_host_get_computed_flops(host));
77 static void change_speed()
79 s4u_Host* host = simgrid::s4u::Host::by_name("MyHost1");
80 simgrid::s4u::this_actor::sleep_for(10.5);
81 XBT_INFO("I slept until now, but now I'll change the speed of this host "
82 "while the other process is still computing! This should slow the computation down.");
86 int main(int argc, char* argv[])
88 sg_host_load_plugin_init();
89 simgrid::s4u::Engine e(&argc, argv);
91 xbt_assert(argc == 2, "Usage: %s platform_file\n\tExample: %s msg_platform.xml\n", argv[0], argv[0]);
92 e.load_platform(argv[1]);
94 simgrid::s4u::Actor::create("load_test", simgrid::s4u::Host::by_name("MyHost1"), execute_load_test);
95 simgrid::s4u::Actor::create("change_speed", simgrid::s4u::Host::by_name("MyHost1"), change_speed);
99 XBT_INFO("Total simulation time: %.2f", simgrid::s4u::Engine::get_clock());