1 /* Copyright (c) 2009-2016. 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. */
7 /* simple test to schedule a DAX file with the Min-Min algorithm. */
9 #include "simgrid/simdag.h"
12 #include "simgrid/jedule/jedule_sd_binding.h"
15 XBT_LOG_NEW_DEFAULT_CATEGORY(test, "Logging specific to this SimDag example");
17 typedef struct _HostAttribute *HostAttribute;
18 struct _HostAttribute {
19 /* Earliest time at which a host is ready to execute a task */
21 SD_task_t last_scheduled_task;
24 static double sg_host_get_available_at(sg_host_t host)
26 HostAttribute attr = (HostAttribute) sg_host_user(host);
27 return attr->available_at;
30 static void sg_host_set_available_at(sg_host_t host, double time)
32 HostAttribute attr = (HostAttribute) sg_host_user(host);
33 attr->available_at = time;
34 sg_host_user_set(host, attr);
37 static SD_task_t sg_host_get_last_scheduled_task( sg_host_t host){
38 HostAttribute attr = (HostAttribute) sg_host_user(host);
39 return attr->last_scheduled_task;
42 static void sg_host_set_last_scheduled_task(sg_host_t host, SD_task_t task){
43 HostAttribute attr = (HostAttribute) sg_host_user(host);
44 attr->last_scheduled_task=task;
45 sg_host_user_set(host, attr);
48 static xbt_dynar_t get_ready_tasks(xbt_dynar_t dax)
51 xbt_dynar_t ready_tasks;
54 ready_tasks = xbt_dynar_new(sizeof(SD_task_t), NULL);
55 xbt_dynar_foreach(dax, i, task) {
56 if (SD_task_get_kind(task) == SD_TASK_COMP_SEQ && SD_task_get_state(task) == SD_SCHEDULABLE) {
57 xbt_dynar_push(ready_tasks, &task);
60 XBT_DEBUG("There are %lu ready tasks", xbt_dynar_length(ready_tasks));
65 static double finish_on_at(SD_task_t task, sg_host_t host)
69 double data_available = 0.;
70 double redist_time = 0;
71 double last_data_available;
73 xbt_dynar_t parents = SD_task_get_parents(task);
75 if (!xbt_dynar_is_empty(parents)) {
76 /* compute last_data_available */
78 last_data_available = -1.0;
79 xbt_dynar_foreach(parents, i, parent) {
81 if (SD_task_get_kind(parent) == SD_TASK_COMM_E2E) {
82 sg_host_t * parent_host= SD_task_get_workstation_list(parent);
83 /* Estimate the redistribution time from this parent */
84 if (SD_task_get_amount(parent) <= 1e-6){
87 redist_time = SD_route_get_latency(parent_host[0], host) +
88 SD_task_get_amount(parent) / SD_route_get_bandwidth(parent_host[0], host);
90 data_available = SD_task_get_start_time(parent) + redist_time;
93 /* no transfer, control dependency */
94 if (SD_task_get_kind(parent) == SD_TASK_COMP_SEQ) {
95 data_available = SD_task_get_finish_time(parent);
98 if (last_data_available < data_available)
99 last_data_available = data_available;
102 xbt_dynar_free_container(&parents);
104 result = MAX(sg_host_get_available_at(host), last_data_available) + SD_task_get_amount(task)/sg_host_speed(host);
106 xbt_dynar_free_container(&parents);
108 result = sg_host_get_available_at(host) + SD_task_get_amount(task)/sg_host_speed(host);
113 static sg_host_t SD_task_get_best_host(SD_task_t task)
115 sg_host_t *hosts = sg_host_list();
116 int nhosts = sg_host_count();
117 sg_host_t best_host = hosts[0];
118 double min_EFT = finish_on_at(task, hosts[0]);
120 for (int i = 1; i < nhosts; i++) {
121 double EFT = finish_on_at(task, hosts[i]);
122 XBT_DEBUG("%s finishes on %s at %f", SD_task_get_name(task), sg_host_get_name(hosts[i]), EFT);
126 best_host = hosts[i];
133 int main(int argc, char **argv)
136 double min_finish_time = -1.0;
137 SD_task_t task, selected_task = NULL;
138 xbt_dynar_t ready_tasks;
139 sg_host_t selected_host = NULL;
140 char * tracefilename = NULL;
142 /* initialization of SD */
143 SD_init(&argc, argv);
145 /* Check our arguments */
146 xbt_assert(argc > 2, "Usage: %s platform_file dax_file [jedule_file]\n"
147 "\tExample: %s simulacrum_7_hosts.xml Montage_25.xml Montage_25.jed", argv[0], argv[0]);
150 tracefilename = xbt_strdup(argv[3]);
152 /* creation of the environment */
153 SD_create_environment(argv[1]);
155 /* Allocating the host attribute */
156 int total_nhosts = sg_host_count();
157 sg_host_t *hosts = sg_host_list();
159 for (cursor = 0; cursor < total_nhosts; cursor++)
160 sg_host_user_set(hosts[cursor], xbt_new0(struct _HostAttribute, 1));
162 /* load the DAX file */
163 xbt_dynar_t dax = SD_daxload(argv[2]);
165 xbt_dynar_foreach(dax, cursor, task) {
166 SD_task_watch(task, SD_DONE);
169 /* Schedule the root first */
170 xbt_dynar_get_cpy(dax, 0, &task);
171 sg_host_t host = SD_task_get_best_host(task);
172 SD_task_schedulel(task, 1, host);
174 while (!xbt_dynar_is_empty(SD_simulate(-1.0))) {
175 /* Get the set of ready tasks */
176 ready_tasks = get_ready_tasks(dax);
177 if (xbt_dynar_is_empty(ready_tasks)) {
178 xbt_dynar_free_container(&ready_tasks);
179 /* there is no ready task, let advance the simulation */
182 /* For each ready task:
183 * get the host that minimizes the completion time.
184 * select the task that has the minimum completion time on its best host.
186 xbt_dynar_foreach(ready_tasks, cursor, task) {
187 XBT_DEBUG("%s is ready", SD_task_get_name(task));
188 host = SD_task_get_best_host(task);
189 double finish_time = finish_on_at(task, host);
190 if (min_finish_time < 0 || finish_time < min_finish_time) {
191 min_finish_time = finish_time;
192 selected_task = task;
193 selected_host = host;
197 XBT_INFO("Schedule %s on %s", SD_task_get_name(selected_task), sg_host_get_name(selected_host));
198 SD_task_schedulel(selected_task, 1, selected_host);
201 * SimDag allows tasks to be executed concurrently when they can by default.
202 * Yet schedulers take decisions assuming that tasks wait for resource availability to start.
203 * The solution (well crude hack is to keep track of the last task scheduled on a host and add a special type of
204 * dependency if needed to force the sequential execution meant by the scheduler.
205 * If the last scheduled task is already done, has failed or is a predecessor of the current task, no need for a
209 SD_task_t last_scheduled_task = sg_host_get_last_scheduled_task(selected_host);
210 if (last_scheduled_task && (SD_task_get_state(last_scheduled_task) != SD_DONE) &&
211 (SD_task_get_state(last_scheduled_task) != SD_FAILED) &&
212 !SD_task_dependency_exists(sg_host_get_last_scheduled_task(selected_host), selected_task))
213 SD_task_dependency_add("resource", NULL, last_scheduled_task, selected_task);
215 sg_host_set_last_scheduled_task(selected_host, selected_task);
216 sg_host_set_available_at(selected_host, min_finish_time);
218 xbt_dynar_free_container(&ready_tasks);
219 /* reset the min_finish_time for the next set of ready tasks */
220 min_finish_time = -1.;
223 XBT_INFO("Simulation Time: %f", SD_get_clock());
224 XBT_INFO("------------------- Produce the trace file---------------------------");
225 XBT_INFO("Producing a jedule output (if active) of the run into %s", tracefilename?tracefilename:"minmin_test.jed");
227 jedule_sd_dump(tracefilename);
231 xbt_dynar_free_container(&ready_tasks);
233 xbt_dynar_foreach(dax, cursor, task) {
234 SD_task_destroy(task);
236 xbt_dynar_free_container(&dax);
238 for (cursor = 0; cursor < total_nhosts; cursor++) {
239 free(sg_host_user(hosts[cursor]));
240 sg_host_user_set(hosts[cursor], NULL);