1 /* Copyright (c) 2007-2018. 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. */
6 #include "simgrid/msg.h"
7 #include "simgrid/plugins/live_migration.h"
9 #include <stdio.h> /* snprintf */
11 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test, "Messages specific for this msg example");
15 /** @addtogroup MSG_examples
17 * - <b>cloud/master_worker_vm.c: Master/workers
18 * example on a cloud</b>. The classical example revisited to demonstrate the use of virtual machines.
21 const double task_comp_size = 10000000;
22 const double task_comm_size = 10000000;
24 static void send_tasks(int nb_workers)
26 for (int i = 0; i < nb_workers; i++) {
27 char *tname = bprintf("Task%02d", i);
28 char *mbox = bprintf("MBOX:WRK%02d", i);
30 msg_task_t task = MSG_task_create(tname, task_comp_size, task_comm_size, NULL);
32 XBT_INFO("Send task(%s) to mailbox(%s)", tname, mbox);
33 MSG_task_send(task, mbox);
40 static int worker_fun(int argc, char *argv[])
42 const char *pr_name = MSG_process_get_name(MSG_process_self());
43 char mbox[MAXMBOXLEN];
44 snprintf(mbox, MAXMBOXLEN, "MBOX:%s", pr_name);
46 XBT_INFO("%s is listening on mailbox(%s)", pr_name, mbox);
49 msg_task_t task = NULL;
51 msg_error_t res = MSG_task_receive(&task, mbox);
52 xbt_assert(res == MSG_OK, "MSG_task_get failed");
54 XBT_INFO("%s received task(%s) from mailbox(%s)", pr_name, MSG_task_get_name(task), mbox);
56 if (strcmp(MSG_task_get_name(task), "finalize") == 0) {
57 MSG_task_destroy(task);
61 MSG_task_execute(task);
62 XBT_INFO("%s executed task(%s)", pr_name, MSG_task_get_name(task));
63 MSG_task_destroy(task);
68 static int master_fun(int argc, char *argv[])
73 xbt_dynar_t worker_pms = MSG_process_get_data(MSG_process_self());
74 int nb_workers = xbt_dynar_length(worker_pms);
76 xbt_dynar_t vms = xbt_dynar_new(sizeof(msg_vm_t), NULL);
78 /* Launch VMs and worker processes. One VM per PM, and one worker process per VM. */
79 XBT_INFO("# Launch %d VMs", nb_workers);
80 for (int i = 0; i< nb_workers; i++) {
81 char *vm_name = bprintf("VM%02d", i);
82 char *pr_name = bprintf("WRK%02d", i);
84 msg_host_t pm = xbt_dynar_get_as(worker_pms, i, msg_host_t);
86 XBT_INFO("create %s on PM(%s)", vm_name, MSG_host_get_name(pm));
87 msg_vm_t vm = MSG_vm_create_core(pm, vm_name);
89 MSG_vm_set_ramsize(vm, 1L * 1024 * 1024 * 1024); // 1GiB
92 xbt_dynar_push(vms, &vm);
94 XBT_INFO("put a process (%s) on %s", pr_name, vm_name);
95 MSG_process_create(pr_name, worker_fun, NULL, (msg_host_t)vm);
101 /* Send a bunch of work to every one */
102 XBT_INFO("# Send a task to %d worker process", nb_workers);
103 send_tasks(nb_workers);
105 XBT_INFO("# Suspend all VMs");
106 xbt_dynar_foreach(vms, i, vm) {
107 XBT_INFO("suspend %s", MSG_vm_get_name(vm));
111 XBT_INFO("# Wait a while");
112 MSG_process_sleep(2);
114 XBT_INFO("# Resume all VMs");
115 xbt_dynar_foreach(vms, i, vm) {
119 XBT_INFO("# Sleep long enough for everyone to be done with previous batch of work");
120 MSG_process_sleep(10 - MSG_get_clock());
122 XBT_INFO("# Add one more process on each VM");
123 xbt_dynar_foreach(vms, i, vm) {
124 unsigned int index = i + xbt_dynar_length(vms);
125 char* vm_name = bprintf("VM%02u", i);
126 char* pr_name = bprintf("WRK%02u", index);
128 XBT_INFO("put a process (%s) on %s", pr_name, vm_name);
129 MSG_process_create(pr_name, worker_fun, NULL, (msg_host_t)vm);
135 XBT_INFO("# Send a task to %d worker process", nb_workers * 2);
136 send_tasks(nb_workers * 2);
138 msg_host_t worker_pm0 = xbt_dynar_get_as(worker_pms, 0, msg_host_t);
139 msg_host_t worker_pm1 = xbt_dynar_get_as(worker_pms, 1, msg_host_t);
141 XBT_INFO("# Migrate all VMs to PM(%s)", MSG_host_get_name(worker_pm0));
142 xbt_dynar_foreach(vms, i, vm) {
143 MSG_vm_migrate(vm, worker_pm0);
146 XBT_INFO("# Migrate all VMs to PM(%s)", MSG_host_get_name(worker_pm1));
147 xbt_dynar_foreach(vms, i, vm) {
148 MSG_vm_migrate(vm, worker_pm1);
151 XBT_INFO("# Shutdown the half of worker processes gracefully. The remaining half will be forcibly killed.");
152 for (i = 0; i < nb_workers; i++) {
153 char mbox[MAXMBOXLEN];
154 snprintf(mbox, MAXMBOXLEN, "MBOX:WRK%02u", i);
155 msg_task_t finalize = MSG_task_create("finalize", 0, 0, 0);
156 MSG_task_send(finalize, mbox);
159 XBT_INFO("# Wait a while before effective shutdown.");
160 MSG_process_sleep(2);
162 XBT_INFO("# Shutdown and destroy all the VMs. The remaining worker processes will be forcibly killed.");
163 xbt_dynar_foreach(vms, i, vm) {
164 XBT_INFO("shutdown %s", MSG_vm_get_name(vm));
166 XBT_INFO("destroy %s", MSG_vm_get_name(vm));
170 XBT_INFO("# Goodbye now!");
171 xbt_dynar_free(&vms);
175 /** Receiver function */
176 int main(int argc, char *argv[])
178 const int nb_workers = 2;
180 MSG_init(&argc, argv);
181 MSG_vm_live_migration_plugin_init();
183 xbt_assert(argc >1,"Usage: %s example/platforms/cluster_backbone.xml\n", argv[0]);
185 /* Load the platform file */
186 MSG_create_environment(argv[1]);
188 /* Retrieve hosts from the platform file */
189 xbt_dynar_t pms = MSG_hosts_as_dynar();
191 /* we need a master node and worker nodes */
192 xbt_assert(xbt_dynar_length(pms) > nb_workers,"need %d hosts", nb_workers + 1);
194 /* the first pm is the master, the others are workers */
195 msg_host_t master_pm = xbt_dynar_get_as(pms, 0, msg_host_t);
197 xbt_dynar_t worker_pms = xbt_dynar_new(sizeof(msg_host_t), NULL);
198 for (int i = 1; i < nb_workers + 1; i++) {
199 msg_host_t pm = xbt_dynar_get_as(pms, i, msg_host_t);
200 xbt_dynar_push(worker_pms, &pm);
202 xbt_dynar_free(&pms);
204 /* Start the master process on the master pm. */
205 MSG_process_create("master", master_fun, worker_pms, master_pm);
207 msg_error_t res = MSG_main();
208 XBT_INFO("Bye (simulation time %g)", MSG_get_clock());
210 xbt_dynar_free(&worker_pms);
212 return !(res == MSG_OK);