1 /* Copyright (c) 2017-2021. 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>
8 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_ptask_multicore, "Messages specific for this s4u example");
10 namespace sg4 = simgrid::s4u;
14 auto e = sg4::Engine::get_instance();
15 std::vector<double> comp(2, 1e9);
16 std::vector<double> comm(4, 0.0);
18 std::vector<sg4::Host*> hosts_diff = {e->host_by_name("MyHost2"), e->host_by_name("MyHost3")};
19 double start_time = sg4::Engine::get_clock();
20 sg4::this_actor::parallel_execute(hosts_diff, comp, comm);
21 XBT_INFO("Computed 2-core activity on two different hosts. Took %g s", e->get_clock() - start_time);
23 // Same host, monocore.
24 std::vector<sg4::Host*> monocore_hosts = {e->host_by_name("MyHost2"), e->host_by_name("MyHost2")};
25 start_time = sg4::Engine::get_clock();
26 sg4::this_actor::parallel_execute(monocore_hosts, comp, comm);
27 XBT_INFO("Computed 2-core activity one 1-core host. Took %g s", e->get_clock() - start_time);
29 // Same host, multicore.
30 std::vector<sg4::Host*> multicore_host = {e->host_by_name("MyHost1"), e->host_by_name("MyHost1")};
31 start_time = sg4::Engine::get_clock();
32 sg4::this_actor::parallel_execute(multicore_host, comp, comm);
33 XBT_INFO("Computed 2-core activity on one 2-core host. Took %g s", e->get_clock() - start_time);
35 // Same host, using too many cores
36 std::vector<double> comp6(6, 1e9);
37 std::vector<double> comm6(36, 0.0);
38 std::vector<sg4::Host*> multicore_overload(6, e->host_by_name("MyHost1"));
39 start_time = sg4::Engine::get_clock();
40 sg4::this_actor::parallel_execute(multicore_overload, comp6, comm6);
41 XBT_INFO("Computed 6-core activity of a 4-core host. Took %g s", e->get_clock() - start_time);
44 int main(int argc, char* argv[])
46 sg4::Engine e(&argc, argv);
48 xbt_assert(argc == 2, "Usage: %s <platform file>", argv[0]);
50 e.load_platform(argv[1]);
51 sg4::Actor::create("test", sg4::Host::by_name("MyHost1"), runner);
54 XBT_INFO("Simulation done.");