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 void sg_host_allocate_attribute(sg_host_t host)
27 data = calloc(1, sizeof(struct _HostAttribute));
28 sg_host_user_set(host, data);
31 static void sg_host_free_attribute(sg_host_t host)
33 free(sg_host_user(host));
34 sg_host_user_set(host, NULL);
37 static double sg_host_get_available_at(sg_host_t host)
39 HostAttribute attr = (HostAttribute) sg_host_user(host);
40 return attr->available_at;
43 static void sg_host_set_available_at(sg_host_t host, double time)
45 HostAttribute attr = (HostAttribute) sg_host_user(host);
46 attr->available_at = time;
47 sg_host_user_set(host, attr);
50 static SD_task_t sg_host_get_last_scheduled_task( sg_host_t host){
51 HostAttribute attr = (HostAttribute) sg_host_user(host);
52 return attr->last_scheduled_task;
55 static void sg_host_set_last_scheduled_task(sg_host_t host, SD_task_t task){
56 HostAttribute attr = (HostAttribute) sg_host_user(host);
57 attr->last_scheduled_task=task;
58 sg_host_user_set(host, attr);
61 static xbt_dynar_t get_ready_tasks(xbt_dynar_t dax)
64 xbt_dynar_t ready_tasks;
67 ready_tasks = xbt_dynar_new(sizeof(SD_task_t), NULL);
68 xbt_dynar_foreach(dax, i, task) {
69 if (SD_task_get_kind(task) == SD_TASK_COMP_SEQ && SD_task_get_state(task) == SD_SCHEDULABLE) {
70 xbt_dynar_push(ready_tasks, &task);
73 XBT_DEBUG("There are %lu ready tasks", xbt_dynar_length(ready_tasks));
78 static double finish_on_at(SD_task_t task, sg_host_t host)
82 double data_available = 0.;
83 double redist_time = 0;
84 double last_data_available;
86 xbt_dynar_t parents = SD_task_get_parents(task);
88 if (!xbt_dynar_is_empty(parents)) {
89 /* compute last_data_available */
91 last_data_available = -1.0;
92 xbt_dynar_foreach(parents, i, parent) {
94 if (SD_task_get_kind(parent) == SD_TASK_COMM_E2E) {
95 sg_host_t * parent_host= SD_task_get_workstation_list(parent);
96 /* Estimate the redistribution time from this parent */
97 if (SD_task_get_amount(parent) <= 1e-6){
100 redist_time = SD_route_get_latency(parent_host[0], host) +
101 SD_task_get_amount(parent) / SD_route_get_bandwidth(parent_host[0], host);
103 data_available = SD_task_get_start_time(parent) + redist_time;
106 /* no transfer, control dependency */
107 if (SD_task_get_kind(parent) == SD_TASK_COMP_SEQ) {
108 data_available = SD_task_get_finish_time(parent);
111 if (last_data_available < data_available)
112 last_data_available = data_available;
115 xbt_dynar_free_container(&parents);
117 result = MAX(sg_host_get_available_at(host), last_data_available) + SD_task_get_amount(task)/sg_host_speed(host);
119 xbt_dynar_free_container(&parents);
121 result = sg_host_get_available_at(host) + SD_task_get_amount(task)/sg_host_speed(host);
126 static sg_host_t SD_task_get_best_host(SD_task_t task)
128 sg_host_t *hosts = sg_host_list();
129 int nhosts = sg_host_count();
130 sg_host_t best_host = hosts[0];
131 double min_EFT = finish_on_at(task, hosts[0]);
133 for (int i = 1; i < nhosts; i++) {
134 double EFT = finish_on_at(task, hosts[i]);
135 XBT_DEBUG("%s finishes on %s at %f", SD_task_get_name(task), sg_host_get_name(hosts[i]), EFT);
139 best_host = hosts[i];
146 int main(int argc, char **argv)
149 double min_finish_time = -1.0;
150 SD_task_t task, selected_task = NULL;
151 xbt_dynar_t ready_tasks;
152 sg_host_t selected_host = NULL;
153 char * tracefilename = NULL;
155 /* initialization of SD */
156 SD_init(&argc, argv);
158 /* Check our arguments */
159 xbt_assert(argc > 2, "Usage: %s platform_file dax_file [jedule_file]\n"
160 "\tExample: %s simulacrum_7_hosts.xml Montage_25.xml Montage_25.jed", argv[0], argv[0]);
163 tracefilename = xbt_strdup(argv[3]);
165 /* creation of the environment */
166 SD_create_environment(argv[1]);
168 /* Allocating the host attribute */
169 int total_nhosts = sg_host_count();
170 sg_host_t *hosts = sg_host_list();
172 for (cursor = 0; cursor < total_nhosts; cursor++)
173 sg_host_allocate_attribute(hosts[cursor]);
175 /* load the DAX file */
176 xbt_dynar_t dax = SD_daxload(argv[2]);
178 xbt_dynar_foreach(dax, cursor, task) {
179 SD_task_watch(task, SD_DONE);
182 /* Schedule the root first */
183 xbt_dynar_get_cpy(dax, 0, &task);
184 sg_host_t host = SD_task_get_best_host(task);
185 SD_task_schedulel(task, 1, host);
187 while (!xbt_dynar_is_empty(SD_simulate(-1.0))) {
188 /* Get the set of ready tasks */
189 ready_tasks = get_ready_tasks(dax);
190 if (xbt_dynar_is_empty(ready_tasks)) {
191 xbt_dynar_free_container(&ready_tasks);
192 /* there is no ready task, let advance the simulation */
195 /* For each ready task:
196 * get the host that minimizes the completion time.
197 * select the task that has the minimum completion time on its best host.
199 xbt_dynar_foreach(ready_tasks, cursor, task) {
200 XBT_DEBUG("%s is ready", SD_task_get_name(task));
201 host = SD_task_get_best_host(task);
202 double finish_time = finish_on_at(task, host);
203 if (min_finish_time < 0 || finish_time < min_finish_time) {
204 min_finish_time = finish_time;
205 selected_task = task;
206 selected_host = host;
210 XBT_INFO("Schedule %s on %s", SD_task_get_name(selected_task), sg_host_get_name(selected_host));
211 SD_task_schedulel(selected_task, 1, selected_host);
214 * SimDag allows tasks to be executed concurrently when they can by default.
215 * Yet schedulers take decisions assuming that tasks wait for resource availability to start.
216 * The solution (well crude hack is to keep track of the last task scheduled on a host and add a special type of
217 * dependency if needed to force the sequential execution meant by the scheduler.
218 * If the last scheduled task is already done, has failed or is a predecessor of the current task, no need for a
222 SD_task_t last_scheduled_task = sg_host_get_last_scheduled_task(selected_host);
223 if (last_scheduled_task && (SD_task_get_state(last_scheduled_task) != SD_DONE) &&
224 (SD_task_get_state(last_scheduled_task) != SD_FAILED) &&
225 !SD_task_dependency_exists(sg_host_get_last_scheduled_task(selected_host), selected_task))
226 SD_task_dependency_add("resource", NULL, last_scheduled_task, selected_task);
228 sg_host_set_last_scheduled_task(selected_host, selected_task);
229 sg_host_set_available_at(selected_host, min_finish_time);
231 xbt_dynar_free_container(&ready_tasks);
232 /* reset the min_finish_time for the next set of ready tasks */
233 min_finish_time = -1.;
236 XBT_INFO("Simulation Time: %f", SD_get_clock());
237 XBT_INFO("------------------- Produce the trace file---------------------------");
238 XBT_INFO("Producing a jedule output (if active) of the run into %s", tracefilename?tracefilename:"minmin_test.jed");
240 jedule_sd_dump(tracefilename);
244 xbt_dynar_free_container(&ready_tasks);
246 xbt_dynar_foreach(dax, cursor, task) {
247 SD_task_destroy(task);
249 xbt_dynar_free_container(&dax);
251 for (cursor = 0; cursor < total_nhosts; cursor++)
252 sg_host_free_attribute(hosts[cursor]);