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. */
7 #include "msg/msg.h" /* Yeah! If you want to use msg, you need to include msg/msg.h */
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/slaves
19 * example, à la 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(int argc, char *argv[]);
27 int slave_fun(int argc, char *argv[]);
29 static void work_batch(int slaves_count) {
31 for (i = 0; i < slaves_count; i++) {
32 char taskname_buffer[64];
33 char mailbox_buffer[64];
35 sprintf(taskname_buffer, "Task_%d", i);
36 sprintf(mailbox_buffer,"Slave_%d",i);
38 XBT_INFO("Sending \"%s\" to \"%s\"",taskname_buffer,mailbox_buffer);
39 MSG_task_send(MSG_task_create(taskname_buffer, task_comp_size, task_comm_size,NULL),
44 int master(int argc, char *argv[]) {
45 int slaves_count = 10;
46 msg_host_t *slaves = xbt_new(msg_host_t,10);
50 /* Retrive the hostnames constituting our playground today */
51 for (i = 1; i < argc; i++) {
52 slaves[i - 1] = MSG_get_host_by_name(argv[i]);
53 xbt_assert(slaves[i - 1] != NULL, "Cannot use inexistent host %s", argv[i]);
56 /* Launch the sub processes: one VM per host, with one process inside each */
58 for (i=0;i<slaves_count;i++) {
60 sprintf(slavename,"Slave %d",i);
61 char**argv=xbt_new(char*,3);
62 argv[0] = xbt_strdup(slavename);
63 argv[1] = bprintf("%d",i);
65 msg_vm_t vm = MSG_vm_start(slaves[i],2);
66 MSG_vm_bind(vm, MSG_process_create_with_arguments(slavename,slave_fun,NULL,slaves[i],2,argv));
69 xbt_dynar_t vms = MSG_vms_as_dynar();
70 XBT_INFO("Launched %ld VMs", xbt_dynar_length(vms));
72 /* Send a bunch of work to every one */
73 XBT_INFO("Send a first batch of work to every one");
74 work_batch(slaves_count);
76 XBT_INFO("Now suspend all VMs, just for fun");
77 for (i=0;i<xbt_dynar_length(vms);i++)
78 MSG_vm_suspend(xbt_dynar_get_as(vms,i,msg_vm_t));
80 XBT_INFO("Wait a while");
83 XBT_INFO("Enough. Let's resume everybody.");
84 for (i=0;i<xbt_dynar_length(vms);i++)
85 MSG_vm_resume(xbt_dynar_get_as(vms,i,msg_vm_t));
87 XBT_INFO("Sleep long enough for everyone to be done with previous batch of work");
88 MSG_process_sleep(1000-MSG_get_clock());
90 XBT_INFO("Add one more process per VM");
91 for (i=0;i<xbt_dynar_length(vms);i++) {
92 msg_vm_t vm = xbt_dynar_get_as(vms,i,msg_vm_t);
94 sprintf(slavename,"Slave %ld",i+xbt_dynar_length(vms));
95 char**argv=xbt_new(char*,3);
96 argv[0] = xbt_strdup(slavename);
97 argv[1] = bprintf("%ld",i+xbt_dynar_length(vms));
99 MSG_vm_bind(vm, MSG_process_create_with_arguments(slavename,slave_fun,NULL,slaves[i],2,argv));
102 work_batch(slaves_count*2);
104 XBT_INFO("Migrate everyone to the second host.");
105 for (i=0;i<xbt_dynar_length(vms);i++)
106 MSG_vm_migrate(xbt_dynar_get_as(vms,i,msg_vm_t),slaves[1]);
108 XBT_INFO("Suspend everyone, move them to the third host, and resume them.");
109 for (i=0;i<xbt_dynar_length(vms);i++) {
110 msg_vm_t vm = xbt_dynar_get_as(vms,i,msg_vm_t);
112 MSG_vm_migrate(vm,slaves[2]);
117 XBT_INFO("Let's shut down the simulation. 10 first processes will be shut down cleanly while the second half will forcefully get killed");
118 for (i = 0; i < slaves_count; i++) {
119 char mailbox_buffer[64];
120 sprintf(mailbox_buffer,"Slave_%d",i);
121 msg_task_t finalize = MSG_task_create("finalize", 0, 0, 0);
122 MSG_task_send(finalize, mailbox_buffer);
125 for (i=0;i<xbt_dynar_length(vms);i++) {
126 msg_vm_t vm = xbt_dynar_get_as(vms,i,msg_vm_t);
131 XBT_INFO("Goodbye now!");
133 xbt_dynar_free(&vms);
135 } /* end_of_master */
137 /** Receiver function */
138 int slave_fun(int argc, char *argv[])
141 msg_task_t task = NULL;
142 _XBT_GNUC_UNUSED int res;
144 /* since the slaves will move around, use slave_%d as mailbox names instead of hostnames */
145 xbt_assert(argc>=2, "slave processes need to be given their rank as parameter");
146 mailbox_name=bprintf("Slave_%s",argv[1]);
149 res = MSG_task_receive(&(task),mailbox_name);
150 xbt_assert(res == MSG_OK, "MSG_task_get failed");
152 XBT_INFO("Received \"%s\" from mailbox %s", MSG_task_get_name(task),mailbox_name);
153 if (!strcmp(MSG_task_get_name(task), "finalize")) {
154 MSG_task_destroy(task);
158 MSG_task_execute(task);
159 XBT_INFO("\"%s\" done", MSG_task_get_name(task));
160 MSG_task_destroy(task);
169 int main(int argc, char *argv[])
171 msg_error_t res = MSG_OK;
172 xbt_dynar_t hosts_dynar;
173 msg_host_t*hosts= xbt_new(msg_host_t,10);
174 char**hostnames= xbt_new(char*,10);
175 char**masterargv=xbt_new(char*,12);
178 /* Get the arguments */
179 MSG_init(&argc, argv);
181 printf("Usage: %s platform_file\n", argv[0]);
182 printf("example: %s msg_platform.xml\n", argv[0]);
185 printf("Usage: %s platform_file\n", argv[0]);
186 printf("Other parameters (such as the deployment file) are ignored.");
189 /* load the platform file */
190 MSG_create_environment(argv[1]);
191 /* Retrieve the 10 first hosts of the platform file */
192 hosts_dynar = MSG_hosts_as_dynar();
193 xbt_assert(xbt_dynar_length(hosts_dynar)>10,
194 "I need at least 10 hosts in the platform file, but %s contains only %ld hosts_dynar.",
195 argv[1],xbt_dynar_length(hosts_dynar));
197 hosts[i] = xbt_dynar_get_as(hosts_dynar,i,msg_host_t);
198 hostnames[i] = xbt_strdup(MSG_host_get_name(hosts[i]));
200 masterargv[0]=xbt_strdup("master");
202 masterargv[i] = xbt_strdup(MSG_host_get_name(hosts[i-1]));
205 MSG_process_create_with_arguments("master",master,NULL,hosts[0],11,masterargv);
207 XBT_INFO("Simulation time %g", MSG_get_clock());
212 xbt_dynar_free(&hosts_dynar);