1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/* 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_ptask_multicore, "Messages specific for this s4u example");
namespace sg4 = simgrid::s4u;
static void runner()
{
const auto* e = sg4::Engine::get_instance();
std::vector<double> comp(2, 1e9);
std::vector<double> comm(4, 0.0);
// Different hosts.
std::vector<sg4::Host*> hosts_diff = {e->host_by_name("MyHost1"), e->host_by_name("MyHost2")};
double start_time = sg4::Engine::get_clock();
sg4::this_actor::parallel_execute(hosts_diff, comp, comm);
XBT_INFO("Computed 2-core activity on two different hosts. Took %g s", e->get_clock() - start_time);
// Same host, multicore.
std::vector<sg4::Host*> multicore_host = {e->host_by_name("MyHost1"), e->host_by_name("MyHost1")};
start_time = sg4::Engine::get_clock();
sg4::this_actor::parallel_execute(multicore_host, comp, comm);
XBT_INFO("Computed 2-core activity on one 4-core host. Took %g s", e->get_clock() - start_time);
// Same host, using too many cores
std::vector<double> comp6(6, 1e9);
std::vector<double> comm6(36, 0.0);
std::vector<sg4::Host*> multicore_overload(6, e->host_by_name("MyHost1"));
start_time = sg4::Engine::get_clock();
sg4::this_actor::parallel_execute(multicore_overload, comp6, comm6);
XBT_INFO("Computed 6-core activity on a 4-core host. Took %g s", e->get_clock() - start_time);
// Same host, adding some communication
std::vector<double> comm2 = {0, 1E7, 1E7, 0};
start_time = sg4::Engine::get_clock();
sg4::this_actor::parallel_execute(multicore_host, comp, comm2);
XBT_INFO("Computed 2-core activity on a 4-core host with some communication. Took %g s", e->get_clock() - start_time);
// See if the multicore execution continues to work after changing pstate
XBT_INFO("Switching machine multicore to pstate 1.");
e->host_by_name("MyHost1")->set_pstate(1);
XBT_INFO("Switching back to pstate 0.");
e->host_by_name("MyHost1")->set_pstate(0);
start_time = sg4::Engine::get_clock();
sg4::this_actor::parallel_execute(multicore_host, comp, comm);
XBT_INFO("Computed 2-core activity on one 4-core host. Took %g s", e->get_clock() - start_time);
start_time = sg4::Engine::get_clock();
sg4::this_actor::parallel_execute(hosts_diff, comp, comm);
XBT_INFO("Computed 2-core activity on two different hosts. Took %g s", e->get_clock() - start_time);
}
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", sg4::Host::by_name("MyHost1"), runner);
e.run();
XBT_INFO("Simulation done.");
return 0;
}
|
