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/plugins/energy.h"
7 #include "simgrid/msg.h"
9 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test, "Messages specific for this msg example");
11 /** @addtogroup MSG_examples
13 * - <b>energy-ptask/energy-ptask.c</b>: Demonstrates the use of @ref MSG_parallel_task_create, to create special
14 * tasks that run on several hosts at the same time. The resulting simulations are very close to what can be
15 * achieved in @ref SD_API, but still allows to use the other features of MSG (it'd be cool to be able to mix
16 * interfaces, but it's not possible ATM).
19 static int runner(int argc, char* argv[])
21 /* Retrieve the list of all hosts as an array of hosts */
22 int hosts_count = MSG_get_host_number();
23 msg_host_t* hosts = xbt_dynar_to_array(MSG_hosts_as_dynar());
25 XBT_INFO("First, build a classical parallel task, with 1 Gflop to execute on each node, "
26 "and 10MB to exchange between each pair");
27 double* computation_amounts = xbt_new0(double, hosts_count);
28 double* communication_amounts = xbt_new0(double, hosts_count* hosts_count);
30 for (int i = 0; i < hosts_count; i++)
31 computation_amounts[i] = 1e9; // 1 Gflop
33 for (int i = 0; i < hosts_count; i++)
34 for (int j = i + 1; j < hosts_count; j++)
35 communication_amounts[i * hosts_count + j] = 1e7; // 10 MB
38 MSG_parallel_task_create("parallel task", hosts_count, hosts, computation_amounts, communication_amounts, NULL);
39 MSG_parallel_task_execute(ptask);
40 MSG_task_destroy(ptask);
41 xbt_free(communication_amounts);
42 xbt_free(computation_amounts);
44 XBT_INFO("We can do the same with a timeout of one second enabled.");
45 computation_amounts = xbt_new0(double, hosts_count);
46 communication_amounts = xbt_new0(double, hosts_count* hosts_count);
47 for (int i = 0; i < hosts_count; i++)
48 computation_amounts[i] = 1e9; // 1 Gflop
49 for (int i = 0; i < hosts_count; i++)
50 for (int j = i + 1; j < hosts_count; j++)
51 communication_amounts[i * hosts_count + j] = 1e7; // 10 MB
53 MSG_parallel_task_create("parallel task", hosts_count, hosts, computation_amounts, communication_amounts, NULL);
54 msg_error_t errcode = MSG_parallel_task_execute_with_timeout(ptask, 1 /* timeout (in seconds)*/);
55 xbt_assert(errcode == MSG_TIMEOUT, "Woops, this did not timeout as expected... Please report that bug.");
56 MSG_task_destroy(ptask);
57 xbt_free(communication_amounts);
58 xbt_free(computation_amounts);
60 XBT_INFO("Then, build a parallel task involving only computations and no communication (1 Gflop per node)");
61 computation_amounts = xbt_new0(double, hosts_count);
62 for (int i = 0; i < hosts_count; i++)
63 computation_amounts[i] = 1e9; // 1 Gflop
64 ptask = MSG_parallel_task_create("parallel exec", hosts_count, hosts, computation_amounts, NULL /* no comm */, NULL);
65 MSG_parallel_task_execute(ptask);
66 MSG_task_destroy(ptask);
67 xbt_free(computation_amounts);
69 XBT_INFO("Then, build a parallel task with no computation nor communication (synchro only)");
70 computation_amounts = xbt_new0(double, hosts_count);
71 communication_amounts = xbt_new0(double, hosts_count* hosts_count); /* memset to 0 by xbt_new0 */
73 MSG_parallel_task_create("parallel sync", hosts_count, hosts, computation_amounts, communication_amounts, NULL);
74 MSG_parallel_task_execute(ptask);
75 MSG_task_destroy(ptask);
76 xbt_free(communication_amounts);
77 xbt_free(computation_amounts);
79 XBT_INFO("Finally, trick the ptask to do a 'remote execution', on host %s", MSG_host_get_name(hosts[1]));
80 computation_amounts = xbt_new0(double, 1);
81 computation_amounts[0] = 1e9; // 1 Gflop
82 msg_host_t* remote = xbt_new(msg_host_t, 1);
84 ptask = MSG_parallel_task_create("remote exec", 1, remote, computation_amounts, NULL /* no comm */, NULL);
85 MSG_parallel_task_execute(ptask);
86 MSG_task_destroy(ptask);
88 xbt_free(computation_amounts);
90 XBT_INFO("Goodbye now!");
95 int main(int argc, char* argv[])
97 MSG_init(&argc, argv);
98 MSG_config("host/model", "ptask_L07");
100 xbt_assert(argc <= 3, "1Usage: %s <platform file> [--energy]", argv[0]);
101 xbt_assert(argc >= 2, "2Usage: %s <platform file> [--energy]", argv[0]);
103 if (argc == 3 && argv[2][2] == 'e')
104 sg_host_energy_plugin_init();
106 MSG_create_environment(argv[1]);
108 /* Pick a process, no matter which, from the platform file */
109 xbt_dynar_t all_hosts = MSG_hosts_as_dynar();
110 msg_host_t first_host = xbt_dynar_getfirst_as(all_hosts, msg_host_t);
111 xbt_dynar_free(&all_hosts);
113 MSG_process_create("test", runner, NULL, first_host);
114 msg_error_t res = MSG_main();
115 XBT_INFO("Simulation done.");
117 return res != MSG_OK;