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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/* 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. */
/* This is an example of how the bootup and shutdown periods can be modeled
* with SimGrid, taking both the time and overall consumption into account.
*
* The main idea is to augment the platform description to declare fake
* pstate that represent these states. The CPU speed of these state is zero
* (the CPU delivers 0 flop per second when booting) while the energy
* consumption is the one measured on average on the modeled machine.
*
* When you want to bootup the machine, you set it into the pstate encoding
* the boot (3 in this example), and leave it so for the right time using a
* sleep_for(). During that time no other execution can progress since the
* resource speed is set at 0 flop/s in this fake pstate. Once this is over,
* the boot is done and we switch back to the regular pstate. Conversely,
* the fake pstate 4 is used to encode the shutdown delay.
*
* Some people don't like the idea to add fake pstates for the boot time, and
* would like SimGrid to provide a "cleaner" model for that. But the "right"
* model depends on the study you want to conduct. If you want to study the
* instantaneous consumption of a rebooting data center, the model used here
* is not enough since it considers only the average consumption over the boot,
* while the instantaneous consumption changes dramatically. Conversely, a
* model taking the instantaneous changes into account will be very difficult
* to instantiate correctly (which values will you use?), so it's not adapted
* to most studies. At least, fake pstates allow you to do exactly what you
* need for your very study.
*/
import org.simgrid.s4u.*;
class monitor extends Actor {
void simulate_bootup(Host host)
{
int previousPstate = host.get_pstate();
Engine.info("Switch to virtual pstate 3, that encodes the 'booting up' state in that platform");
host.set_pstate(3);
Engine.info("Actually start the host");
host.turn_on();
Engine.info("Wait 150s to simulate the boot time.");
sleep_for(150);
Engine.info("The host is now up and running. Switch back to previous pstate %d", previousPstate);
host.set_pstate(previousPstate);
}
void simulate_shutdown(Host host)
{
int previousPstate = host.get_pstate();
Engine.info("Switch to virtual pstate 4, that encodes the 'shutting down' state in that platform");
host.set_pstate(4);
Engine.info("Wait 7 seconds to simulate the shutdown time.");
sleep_for(7);
Engine.info("Switch back to previous pstate %d, that will be used on reboot.", previousPstate);
host.set_pstate(previousPstate);
Engine.info("Actually shutdown the host");
host.turn_off();
}
public void run()
{
Host host1 = get_engine().host_by_name("MyHost1");
Engine.info("Initial pstate: %d; Energy dissipated so far:%.0E J", host1.get_pstate(), host1.get_consumed_energy());
Engine.info("Sleep for 10 seconds");
sleep_for(10);
Engine.info("Done sleeping. Current pstate: %d; Energy dissipated so far: %.2f J", host1.get_pstate(),
host1.get_consumed_energy());
simulate_shutdown(host1);
Engine.info("Host1 is now OFF. Current pstate: %d; Energy dissipated so far: %.2f J", host1.get_pstate(),
host1.get_consumed_energy());
Engine.info("Sleep for 10 seconds");
sleep_for(10);
Engine.info("Done sleeping. Current pstate: %d; Energy dissipated so far: %.2f J", host1.get_pstate(),
host1.get_consumed_energy());
simulate_bootup(host1);
Engine.info("Host1 is now ON again. Current pstate: %d; Energy dissipated so far: %.2f J", host1.get_pstate(),
host1.get_consumed_energy());
}
}
public class energy_boot {
public static void main(String[] args)
{
Engine e = new Engine(args);
e.plugin_host_energy_init();
if (args.length < 1)
Engine.die("Usage: java -cp energy_boot.jar energy_boot platform_file\n\tExample: java -cp energy_boot.jar "
+ "energy_boot platform.xml\n");
e.load_platform(args[0]);
e.host_by_name("MyHost2").add_actor("Boot Monitor", new monitor());
e.run();
Engine.info("End of simulation.");
// The following call is useless in your code, but our continuous integration uses it to track memleaks
e.force_garbage_collection();
}
}
|
