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. */
9 #include "simgrid/simdag.h"
13 XBT_LOG_NEW_DEFAULT_CATEGORY(sd_comm_throttling,
14 "Logging specific to this SimDag example");
16 int main(int argc, char **argv)
19 const char *platform_file;
20 const sg_host_t *workstations;
21 SD_task_t task, taskA, taskB, taskC, taskD, taskE;
22 xbt_dynar_t changed_tasks;
24 /* initialization of SD */
27 /* xbt_log_control_set("sd.thres=debug"); */
29 xbt_assert(argc > 1, "Usage: %s platform_file\n"
30 "\nExample: %s two_clusters.xml", argv[0], argv[0]);
32 /* creation of the environment */
33 platform_file = argv[1];
34 SD_create_environment(platform_file);
36 workstations = sg_host_list();
38 /* creation of some typed tasks and their dependencies */
39 /* chain of five tasks, three compute tasks with two data transfers */
41 taskA = SD_task_create_comp_seq("Task A", NULL, 5e9);
42 taskB = SD_task_create_comm_e2e("Task B", NULL, 1e7);
43 taskC = SD_task_create_comp_seq("Task C", NULL, 5e9);
44 taskD = SD_task_create_comm_e2e("Task D", NULL, 1e7);
45 taskE = SD_task_create_comp_seq("Task E", NULL, 5e9);
47 SD_task_dependency_add(NULL, NULL, taskA, taskB);
48 SD_task_dependency_add(NULL, NULL, taskB, taskC);
49 SD_task_dependency_add(NULL, NULL, taskC, taskD);
50 SD_task_dependency_add(NULL, NULL, taskD, taskE);
52 /* Add watchpoints on completion of compute tasks */
53 SD_task_watch(taskA, SD_DONE);
54 SD_task_watch(taskC, SD_DONE);
55 SD_task_watch(taskE, SD_DONE);
57 /* Auto-schedule the compute tasks on three different workstations */
58 /* Data transfer tasks taskB and taskD are automagically scheduled */
59 SD_task_schedulel(taskA, 1, workstations[0]);
60 SD_task_schedulel(taskC, 1, workstations[1]);
61 SD_task_schedulel(taskE, 1, workstations[0]);
62 while (!xbt_dynar_is_empty((changed_tasks = SD_simulate(-1.0)))) {
63 XBT_INFO("Simulation stopped after %.4f seconds", SD_get_clock());
64 xbt_dynar_foreach(changed_tasks, ctr, task) {
65 XBT_INFO("Task '%s' start time: %f, finish time: %f",
66 SD_task_get_name(task),
67 SD_task_get_start_time(task),
68 SD_task_get_finish_time(task));
71 /* let throttle the communication for taskD if its parent is SD_DONE */
72 /* the bandwidth is 1.25e8, the data size is 1e7, and we want to throttle
73 * the bandwidth by a factor 2. the rate is then 1.25e8/(2*1e7)=6.25
74 * Changing the rate is possible before the task execution starts (in SD_RUNNING
77 if (SD_task_get_state(taskC) == SD_DONE && SD_task_get_state(taskD) < SD_RUNNING)
78 SD_task_set_rate(taskD, 6.25);
81 XBT_DEBUG("Destroying tasks...");
83 SD_task_destroy(taskA);
84 SD_task_destroy(taskB);
85 SD_task_destroy(taskC);
86 SD_task_destroy(taskD);
87 SD_task_destroy(taskE);
89 XBT_DEBUG("Tasks destroyed. Exiting SimDag...");