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[]);
29 static void work_batch(int workers_count)
32 for (i = 0; i < workers_count; i++) {
33 char *tname = bprintf("Task%02d", i);
34 char *mbox = bprintf("MBOX:WRK%02d", i);
36 msg_task_t task = MSG_task_create(tname, task_comp_size, task_comm_size, NULL);
38 XBT_INFO("send task(%s) to mailbox(%s)", tname, mbox);
39 MSG_task_send(task, mbox);
46 int master_fun(int argc, char *argv[])
50 int workers_count = argc - 1;
52 msg_host_t *pms = xbt_new(msg_host_t, workers_count);
53 xbt_dynar_t vms = xbt_dynar_new(sizeof(msg_vm_t), NULL);
55 /* Retrive the PMs that launch worker processes. */
56 for (i = 1; i < argc; i++)
57 pms[i - 1] = MSG_get_host_by_name(argv[i]);
60 /* Launch VMs and worker processes. One VM per PM, and one worker process per VM. */
62 XBT_INFO("Launch %ld VMs", workers_count);
63 for (i=0; i< workers_count; i++) {
64 char *vm_name = bprintf("VM%02d", i);
65 char *pr_name = bprintf("WRK%02d", i);
66 char *mbox = bprintf("MBOX:WRK%02d", i);
68 char **wrk_argv = xbt_new(char*, 3);
69 wrk_argv[0] = pr_name;
73 XBT_INFO("create %s", vm_name);
74 msg_vm_t vm = MSG_vm_create_core(pms[i], vm_name);
76 xbt_dynar_push(vms, &vm);
78 XBT_INFO("put %s on %s", pr_name, vm_name);
79 MSG_process_create_with_arguments(pr_name, worker_fun, NULL, vm, 2, wrk_argv);
83 /* Send a bunch of work to every one */
84 XBT_INFO("Send a task to %d worker process", workers_count);
85 work_batch(workers_count);
87 XBT_INFO("Suspend all VMs");
88 xbt_dynar_foreach(vms, i, vm) {
89 const char *vm_name = MSG_host_get_name(vm);
90 XBT_INFO("suspend %s", vm_name);
94 XBT_INFO("Wait a while");
97 XBT_INFO("Resume all VMs");
98 xbt_dynar_foreach(vms, i, vm) {
103 XBT_INFO("Sleep long enough for everyone to be done with previous batch of work");
104 MSG_process_sleep(1000 - MSG_get_clock());
106 XBT_INFO("Add one more process per VM");
107 xbt_dynar_foreach(vms, i, vm) {
108 unsigned int index = i + xbt_dynar_length(vms);
109 char *vm_name = bprintf("VM%02d", i);
110 char *pr_name = bprintf("WRK%02d", index);
111 char *mbox = bprintf("MBOX:WRK%02d", index);
113 char **wrk_argv = xbt_new(char*, 3);
114 wrk_argv[0] = pr_name;
118 XBT_INFO("put %s on %s", pr_name, vm_name);
119 MSG_process_create_with_arguments(pr_name, worker_fun, NULL, vm, 2, wrk_argv);
122 XBT_INFO("Send a task to %d worker process", workers_count * 2);
123 work_batch(workers_count * 2);
125 XBT_INFO("Migrate all VMs to PM(%s)", MSG_host_get_name(pms[1]));
126 xbt_dynar_foreach(vms, i, vm) {
127 MSG_vm_migrate(vm, pms[1]);
130 /* FIXME: Do we need to support cold migration? Yes, but how should
131 * parameters of a migration be passed? */
132 XBT_INFO("Migrate all VMs to PM(%s)", MSG_host_get_name(pms[2]));
133 xbt_dynar_foreach(vms, i, vm) {
134 // MSG_vm_suspend(vm);
135 MSG_vm_migrate(vm, pms[2]);
136 // MSG_vm_resume(vm);
140 XBT_INFO("Shutdown the first 10 worker processes gracefuly. The the second half will forcefully get killed");
141 for (i = 0; i < workers_count; i++) {
143 sprintf(mbox, "MBOX:WRK%02d", i);
144 msg_task_t finalize = MSG_task_create("finalize", 0, 0, 0);
145 MSG_task_send(finalize, mbox);
148 XBT_INFO("Wait a while before effective shutdown.");
149 MSG_process_sleep(2);
152 XBT_INFO("Shutdown and destroy all the VMs. The remaining worker processes will be forcibly killed.");
153 xbt_dynar_foreach(vms, i, vm) {
154 XBT_INFO("shutdown %s", MSG_host_get_name(vm));
156 XBT_INFO("destroy %s", MSG_host_get_name(vm));
160 XBT_INFO("Goodbye now!");
162 xbt_dynar_free(&vms);
167 /** Receiver function */
168 int worker_fun(int argc, char *argv[])
170 xbt_assert(argc == 2, "need mbox in arguments");
172 char *mbox = argv[1];
173 const char *pr_name = MSG_process_get_name(MSG_process_self());
174 XBT_INFO("%s is listenning on mailbox(%s)", pr_name, mbox);
177 msg_task_t task = NULL;
179 msg_error_t res = MSG_task_receive(&task, mbox);
181 XBT_CRITICAL("MSG_task_get failed");
185 XBT_INFO("%s received task(%s) from mailbox(%s)",
186 pr_name, MSG_task_get_name(task), mbox);
188 if (!strcmp(MSG_task_get_name(task), "finalize")) {
189 MSG_task_destroy(task);
193 MSG_task_execute(task);
194 XBT_INFO("%s executed task(%s)", pr_name, MSG_task_get_name(task));
195 MSG_task_destroy(task);
202 int main(int argc, char *argv[])
204 MSG_init(&argc, argv);
206 printf("Usage: %s example/msg/msg_platform.xml\n", argv[0]);
210 /* Load the platform file */
211 MSG_create_environment(argv[1]);
213 /* Retrieve the 10 first hosts from the platform file */
214 xbt_dynar_t hosts_dynar = MSG_hosts_as_dynar();
216 if (xbt_dynar_length(hosts_dynar) <= 10) {
217 XBT_CRITICAL("need 10 hosts");
221 msg_host_t master_pm;
222 char **master_argv = xbt_new(char *, 12);
223 master_argv[0] = xbt_strdup("master");
224 master_argv[11] = NULL;
228 xbt_dynar_foreach(hosts_dynar, i, host) {
234 master_argv[i] = xbt_strdup(MSG_host_get_name(host));
241 MSG_process_create_with_arguments("master", master_fun, NULL, master_pm, 11, master_argv);
243 msg_error_t res = MSG_main();
244 XBT_INFO("Simulation time %g", MSG_get_clock());
246 xbt_dynar_free(&hosts_dynar);
248 return !(res == MSG_OK);