1 /* Copyright (c) 2007-2015. 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 #include "simgrid/msg.h"
9 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test, "Messages specific for this msg example");
13 /** @addtogroup MSG_examples
15 * - <b>cloud/master_worker_vm.c: Master/workers
16 * example on a cloud</b>. The classical example revisited to demonstrate the use of virtual machines.
19 const double task_comp_size = 10000000;
20 const double task_comm_size = 10000000;
22 static void send_tasks(int nb_workers)
24 for (int i = 0; i < nb_workers; i++) {
25 char *tname = bprintf("Task%02d", i);
26 char *mbox = bprintf("MBOX:WRK%02d", i);
28 msg_task_t task = MSG_task_create(tname, task_comp_size, task_comm_size, NULL);
30 XBT_INFO("Send task(%s) to mailbox(%s)", tname, mbox);
31 MSG_task_send(task, mbox);
38 static int worker_fun(int argc, char *argv[])
40 const char *pr_name = MSG_process_get_name(MSG_process_self());
41 char mbox[MAXMBOXLEN];
42 snprintf(mbox, MAXMBOXLEN, "MBOX:%s", pr_name);
44 XBT_INFO("%s is listening on mailbox(%s)", pr_name, mbox);
47 msg_task_t task = NULL;
49 msg_error_t res = MSG_task_receive(&task, mbox);
51 XBT_CRITICAL("MSG_task_get failed");
55 XBT_INFO("%s received task(%s) from mailbox(%s)", pr_name, MSG_task_get_name(task), mbox);
57 if (!strcmp(MSG_task_get_name(task), "finalize")) {
58 MSG_task_destroy(task);
62 MSG_task_execute(task);
63 XBT_INFO("%s executed task(%s)", pr_name, MSG_task_get_name(task));
64 MSG_task_destroy(task);
69 static int master_fun(int argc, char *argv[])
74 xbt_dynar_t worker_pms = MSG_process_get_data(MSG_process_self());
75 int nb_workers = xbt_dynar_length(worker_pms);
77 xbt_dynar_t vms = xbt_dynar_new(sizeof(msg_vm_t), NULL);
79 /* Launch VMs and worker processes. One VM per PM, and one worker process per VM. */
80 XBT_INFO("# Launch %d VMs", nb_workers);
81 for (int i = 0; i< nb_workers; i++) {
82 char *vm_name = bprintf("VM%02d", i);
83 char *pr_name = bprintf("WRK%02d", i);
85 msg_host_t pm = xbt_dynar_get_as(worker_pms, i, msg_host_t);
87 XBT_INFO("create %s on PM(%s)", vm_name, MSG_host_get_name(pm));
88 msg_vm_t vm = MSG_vm_create_core(pm, vm_name);
91 memset(¶ms, 0, sizeof(params));
92 params.ramsize = 1L * 1024 * 1024 * 1024; // 1Gbytes
93 MSG_host_set_params(vm, ¶ms);
96 xbt_dynar_push(vms, &vm);
98 XBT_INFO("put a process (%s) on %s", pr_name, vm_name);
99 MSG_process_create(pr_name, worker_fun, NULL, vm);
105 /* Send a bunch of work to every one */
106 XBT_INFO("# Send a task to %d worker process", nb_workers);
107 send_tasks(nb_workers);
109 XBT_INFO("# Suspend all VMs");
110 xbt_dynar_foreach(vms, i, vm) {
111 const char *vm_name = MSG_host_get_name(vm);
112 XBT_INFO("suspend %s", vm_name);
116 XBT_INFO("# Wait a while");
117 MSG_process_sleep(2);
119 XBT_INFO("# Resume all VMs");
120 xbt_dynar_foreach(vms, i, vm) {
124 XBT_INFO("# Sleep long enough for everyone to be done with previous batch of work");
125 MSG_process_sleep(1000 - MSG_get_clock());
127 XBT_INFO("# Add one more process on each VM");
128 xbt_dynar_foreach(vms, i, vm) {
129 unsigned int index = i + xbt_dynar_length(vms);
130 char *vm_name = bprintf("VM%02d", i);
131 char *pr_name = bprintf("WRK%02d", index);
133 XBT_INFO("put a process (%s) on %s", pr_name, vm_name);
134 MSG_process_create(pr_name, worker_fun, NULL, vm);
140 XBT_INFO("# Send a task to %d worker process", nb_workers * 2);
141 send_tasks(nb_workers * 2);
143 msg_host_t worker_pm0 = xbt_dynar_get_as(worker_pms, 0, msg_host_t);
144 msg_host_t worker_pm1 = xbt_dynar_get_as(worker_pms, 1, msg_host_t);
146 XBT_INFO("# Migrate all VMs to PM(%s)", MSG_host_get_name(worker_pm0));
147 xbt_dynar_foreach(vms, i, vm) {
148 MSG_vm_migrate(vm, worker_pm0);
151 XBT_INFO("# Migrate all VMs to PM(%s)", MSG_host_get_name(worker_pm1));
152 xbt_dynar_foreach(vms, i, vm) {
153 MSG_vm_migrate(vm, worker_pm1);
156 XBT_INFO("# Shutdown the half of worker processes gracefuly. The remaining half will be forcibly killed.");
157 for (i = 0; i < nb_workers; i++) {
158 char mbox[MAXMBOXLEN];
159 snprintf(mbox, MAXMBOXLEN, "MBOX:WRK%02d", i);
160 msg_task_t finalize = MSG_task_create("finalize", 0, 0, 0);
161 MSG_task_send(finalize, mbox);
164 XBT_INFO("# Wait a while before effective shutdown.");
165 MSG_process_sleep(2);
167 XBT_INFO("# Shutdown and destroy all the VMs. The remaining worker processes will be forcibly killed.");
168 xbt_dynar_foreach(vms, i, vm) {
169 XBT_INFO("shutdown %s", MSG_host_get_name(vm));
171 XBT_INFO("destroy %s", MSG_host_get_name(vm));
175 XBT_INFO("# Goodbye now!");
176 xbt_dynar_free(&vms);
180 /** Receiver function */
181 int main(int argc, char *argv[])
183 const int nb_workers = 2;
185 MSG_init(&argc, argv);
186 xbt_assert(argc >1,"Usage: %s example/msg/msg_platform.xml\n", argv[0]);
188 /* Load the platform file */
189 MSG_create_environment(argv[1]);
191 /* Retrieve hosts from the platform file */
192 xbt_dynar_t pms = MSG_hosts_as_dynar();
194 /* we need a master node and worker nodes */
195 xbt_assert(xbt_dynar_length(pms) > nb_workers,"need %d hosts", nb_workers + 1);
197 /* the first pm is the master, the others are workers */
198 msg_host_t master_pm = xbt_dynar_get_as(pms, 0, msg_host_t);
200 xbt_dynar_t worker_pms = xbt_dynar_new(sizeof(msg_host_t), NULL);
201 for (int i = 1; i < nb_workers + 1; i++) {
202 msg_host_t pm = xbt_dynar_get_as(pms, i, msg_host_t);
203 xbt_dynar_push(worker_pms, &pm);
205 xbt_dynar_free(&pms);
207 /* Start the master process on the master pm. */
208 MSG_process_create("master", master_fun, worker_pms, master_pm);
210 msg_error_t res = MSG_main();
211 XBT_INFO("Bye (simulation time %g)", MSG_get_clock());
213 xbt_dynar_free(&worker_pms);
215 return !(res == MSG_OK);