1 /* Copyright (c) 2007-2012. 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. */
8 #include "xbt/sysdep.h" /* calloc, printf */
10 /* Create a log channel to have nice outputs. */
12 #include "xbt/asserts.h"
13 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test,
14 "Messages specific for this msg example");
16 /** @addtogroup MSG_examples
18 * - <b>cloud/masterslave_virtual_machines.c: Master/workers
19 * example on a cloud</b>. The classical example revisited to demonstrate the use of virtual machines.
22 double task_comp_size = 10000000;
23 double task_comm_size = 10000000;
26 int master_fun(int argc, char *argv[]);
27 int worker_fun(int argc, char *argv[]);
30 //int nb_vms=nb_host*2; // 2 VMs per PM
32 static void work_batch(int workers_count)
35 for (i = 0; i < workers_count; i++) {
36 char *tname = bprintf("Task%02d", i);
37 char *mbox = bprintf("MBOX:WRK%02d", i);
39 msg_task_t task = MSG_task_create(tname, task_comp_size, task_comm_size, NULL);
41 XBT_INFO("send task(%s) to mailbox(%s)", tname, mbox);
42 MSG_task_send(task, mbox);
49 int master_fun(int argc, char *argv[])
53 int workers_count = argc - 1;
55 msg_host_t *pms = xbt_new(msg_host_t, workers_count);
56 xbt_dynar_t vms = xbt_dynar_new(sizeof(msg_vm_t), NULL);
58 /* Retrive the PMs that launch worker processes. */
59 for (i = 1; i < argc; i++)
60 pms[i - 1] = MSG_get_host_by_name(argv[i]);
63 /* Launch VMs and worker processes. One VM per PM, and one worker process per VM. */
65 XBT_INFO("Launch %ld VMs", workers_count);
66 for (i=0; i< workers_count; i++) {
67 char *vm_name = bprintf("VM%02d", i);
68 char *pr_name = bprintf("WRK%02d", i);
69 char *mbox = bprintf("MBOX:WRK%02d", i);
71 char **wrk_argv = xbt_new(char*, 3);
72 wrk_argv[0] = pr_name;
76 XBT_INFO("create %s", vm_name);
77 msg_vm_t vm = MSG_vm_create_core(pms[i], vm_name);
79 xbt_dynar_push(vms, &vm);
81 XBT_INFO("put %s on %s", pr_name, vm_name);
82 MSG_process_create_with_arguments(pr_name, worker_fun, NULL, vm, 2, wrk_argv);
86 /* Send a bunch of work to every one */
87 XBT_INFO("Send a task to %d worker process", workers_count);
88 work_batch(workers_count);
90 XBT_INFO("Suspend all VMs");
91 xbt_dynar_foreach(vms, i, vm) {
92 const char *vm_name = MSG_host_get_name(vm);
93 XBT_INFO("suspend %s", vm_name);
97 XBT_INFO("Wait a while");
100 XBT_INFO("Resume all VMs");
101 xbt_dynar_foreach(vms, i, vm) {
106 XBT_INFO("Sleep long enough for everyone to be done with previous batch of work");
107 MSG_process_sleep(1000 - MSG_get_clock());
109 XBT_INFO("Add one more process per VM");
110 xbt_dynar_foreach(vms, i, vm) {
111 unsigned int index = i + xbt_dynar_length(vms);
112 char *vm_name = bprintf("VM%02d", i);
113 char *pr_name = bprintf("WRK%02d", index);
114 char *mbox = bprintf("MBOX:WRK%02d", index);
116 char **wrk_argv = xbt_new(char*, 3);
117 wrk_argv[0] = pr_name;
121 XBT_INFO("put %s on %s", pr_name, vm_name);
122 MSG_process_create_with_arguments(pr_name, worker_fun, NULL, vm, 2, wrk_argv);
125 XBT_INFO("Send a task to %d worker process", workers_count * 2);
126 work_batch(workers_count * 2);
128 XBT_INFO("Migrate all VMs to PM(%s)", MSG_host_get_name(pms[1]));
129 xbt_dynar_foreach(vms, i, vm) {
130 MSG_vm_migrate(vm, pms[1]);
133 /* Migration with default policy is called (i.e. live migration with pre-copy strategy */
134 /* If you want to use other policy such as post-copy or cold migration, you should add a third parameter that defines the policy */
135 XBT_INFO("Migrate all VMs to PM(%s)", MSG_host_get_name(pms[2]));
136 xbt_dynar_foreach(vms, i, vm) {
137 // MSG_vm_suspend(vm);
138 MSG_vm_migrate(vm, pms[2]);
139 // MSG_vm_resume(vm);
143 XBT_INFO("Shutdown the first worker processes gracefuly. The the second half will forcefully get killed");
144 for (i = 0; i < workers_count; i++) {
146 sprintf(mbox, "MBOX:WRK%02d", i);
147 msg_task_t finalize = MSG_task_create("finalize", 0, 0, 0);
148 MSG_task_send(finalize, mbox);
151 XBT_INFO("Wait a while before effective shutdown.");
152 MSG_process_sleep(2);
155 XBT_INFO("Shutdown and destroy all the VMs. The remaining worker processes will be forcibly killed.");
156 xbt_dynar_foreach(vms, i, vm) {
157 XBT_INFO("shutdown %s", MSG_host_get_name(vm));
159 XBT_INFO("destroy %s", MSG_host_get_name(vm));
163 XBT_INFO("Goodbye now!");
165 xbt_dynar_free(&vms);
170 /** Receiver function */
171 int worker_fun(int argc, char *argv[])
173 xbt_assert(argc == 2, "need mbox in arguments");
175 char *mbox = argv[1];
176 const char *pr_name = MSG_process_get_name(MSG_process_self());
177 XBT_INFO("%s is listenning on mailbox(%s)", pr_name, mbox);
180 msg_task_t task = NULL;
182 msg_error_t res = MSG_task_receive(&task, mbox);
184 XBT_CRITICAL("MSG_task_get failed");
188 XBT_INFO("%s received task(%s) from mailbox(%s)",
189 pr_name, MSG_task_get_name(task), mbox);
191 if (!strcmp(MSG_task_get_name(task), "finalize")) {
192 MSG_task_destroy(task);
196 MSG_task_execute(task);
197 XBT_INFO("%s executed task(%s)", pr_name, MSG_task_get_name(task));
198 MSG_task_destroy(task);
205 int main(int argc, char *argv[])
207 MSG_init(&argc, argv);
209 printf("Usage: %s example/msg/msg_platform.xml\n", argv[0]);
212 /* Load the platform file */
213 MSG_create_environment(argv[1]);
215 /* Retrieve the first hosts from the platform file */
216 xbt_dynar_t hosts_dynar = MSG_hosts_as_dynar();
218 if (xbt_dynar_length(hosts_dynar) <= nb_hosts) {
219 XBT_CRITICAL("need %d hosts", nb_hosts);
223 msg_host_t master_pm;
224 char **master_argv = xbt_new(char *, 12);
225 master_argv[0] = xbt_strdup("master");
226 master_argv[11] = NULL;
230 xbt_dynar_foreach(hosts_dynar, i, host) {
236 master_argv[i] = xbt_strdup(MSG_host_get_name(host));
243 MSG_process_create_with_arguments("master", master_fun, NULL, master_pm, nb_hosts+1, master_argv);
245 msg_error_t res = MSG_main();
246 XBT_INFO("Simulation time %g", MSG_get_clock());
248 xbt_dynar_free(&hosts_dynar);
250 return !(res == MSG_OK);