1 /* Copyright (c) 2006-2010, 2012-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "simgrid/simdag.h"
11 XBT_LOG_NEW_DEFAULT_CATEGORY(sd_comm_throttling, "Logging specific to this SimDag example");
13 int main(int argc, char **argv)
16 const sg_host_t *hosts;
17 SD_task_t task, taskA, taskB, taskC, taskD, taskE;
18 xbt_dynar_t changed_tasks;
21 xbt_assert(argc > 1, "Usage: %s platform_file\n\nExample: %s two_clusters.xml", argv[0], argv[0]);
23 /* creation of the environment */
24 SD_create_environment(argv[1]);
26 hosts = sg_host_list();
28 /* creation of some typed tasks and their dependencies */
29 /* chain of five tasks, three compute tasks with two data transfers in between */
30 taskA = SD_task_create_comp_seq("Task A", NULL, 5e9);
31 taskB = SD_task_create_comm_e2e("Task B", NULL, 1e7);
32 taskC = SD_task_create_comp_seq("Task C", NULL, 5e9);
33 taskD = SD_task_create_comm_e2e("Task D", NULL, 1e7);
34 taskE = SD_task_create_comp_seq("Task E", NULL, 5e9);
36 SD_task_dependency_add(NULL, NULL, taskA, taskB);
37 SD_task_dependency_add(NULL, NULL, taskB, taskC);
38 SD_task_dependency_add(NULL, NULL, taskC, taskD);
39 SD_task_dependency_add(NULL, NULL, taskD, taskE);
41 /* Add watchpoints on completion of compute tasks */
42 SD_task_watch(taskA, SD_DONE);
43 SD_task_watch(taskC, SD_DONE);
44 SD_task_watch(taskE, SD_DONE);
46 /* Auto-schedule the compute tasks on three different workstations */
47 /* Data transfer tasks taskB and taskD are automagically scheduled */
48 SD_task_schedulel(taskA, 1, hosts[0]);
49 SD_task_schedulel(taskC, 1, hosts[1]);
50 SD_task_schedulel(taskE, 1, hosts[0]);
51 while (!xbt_dynar_is_empty((changed_tasks = SD_simulate(-1.0)))) {
52 XBT_INFO("Simulation stopped after %.4f seconds", SD_get_clock());
53 xbt_dynar_foreach(changed_tasks, ctr, task) {
54 XBT_INFO("Task '%s' start time: %f, finish time: %f", SD_task_get_name(task), SD_task_get_start_time(task),
55 SD_task_get_finish_time(task));
58 /* let throttle the communication for taskD if its parent is SD_DONE */
59 /* the bandwidth is 1.25e8, the data size is 1e7, and we want to throttle the bandwidth by a factor 2.
60 * The rate is then 1.25e8/(2*1e7)=6.25
61 * Changing the rate is possible before the task execution starts (in SD_RUNNING state).
63 if (SD_task_get_state(taskC) == SD_DONE && SD_task_get_state(taskD) < SD_RUNNING)
64 SD_task_set_rate(taskD, 6.25);
67 XBT_DEBUG("Destroying tasks...");
68 SD_task_destroy(taskA);
69 SD_task_destroy(taskB);
70 SD_task_destroy(taskC);
71 SD_task_destroy(taskD);
72 SD_task_destroy(taskE);
74 XBT_DEBUG("Tasks destroyed. Exiting SimDag...");