1 /* Copyright (c) 2007-2017. 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"
8 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test, "Messages specific for this msg example");
10 #define FINALIZE ((void*)221297) /* a magic number to tell people to stop working */
12 static char* build_channel_name(char* buffer, const char* sender, const char* receiver)
14 strcpy(buffer, sender);
16 strcat(buffer, receiver);
20 /* forward definitions */
21 static int master(int argc, char* argv[]);
22 static int worker(int argc, char* argv[]);
24 static int master(int argc, char* argv[])
26 msg_host_t host_self = MSG_host_self();
27 char* master_name = (char*)MSG_host_get_name(host_self);
30 TRACE_category(master_name);
32 double timeout = xbt_str_parse_double(argv[1], "Invalid timeout: %s"); /** - timeout */
33 double comp_size = xbt_str_parse_double(argv[2], "Invalid computational size: %s"); /** - Task compute cost */
34 double comm_size = xbt_str_parse_double(argv[3], "Invalid communication size: %s"); /** - Task communication size */
36 /* Get the info about the worker processes */
37 int workers_count = MSG_get_host_number();
38 msg_host_t* workers = xbt_dynar_to_array(MSG_hosts_as_dynar());
40 for (int i = 0; i < workers_count; i++) // Remove my host from the list
41 if (host_self == workers[i]) {
42 workers[i] = workers[workers_count - 1];
47 for (int i = 0; i < workers_count; i++)
48 MSG_process_create("worker", worker, (void*)master_name, workers[i]);
49 XBT_INFO("Got %d workers and will send tasks for %g seconds", workers_count, timeout);
51 /* Dispatch the tasks */
53 while (MSG_get_clock() < timeout) {
55 /* Retrieve the next incomming request */
56 XBT_DEBUG("Retrieve the next incomming request on %s", master_name);
57 msg_task_t request = NULL;
58 int res = MSG_task_receive(&(request), master_name);
59 xbt_assert(res == MSG_OK, "MSG_task_receive failed");
60 msg_host_t requester = MSG_task_get_data(request);
61 MSG_task_destroy(request);
63 /* Prepare the task to be sent */
64 char sprintf_buffer[64];
65 sprintf(sprintf_buffer, "Task_%d", task_num);
66 msg_task_t task = MSG_task_create(sprintf_buffer, comp_size, comm_size, NULL);
67 MSG_task_set_category(task, master_name);
70 build_channel_name(channel, master_name, MSG_host_get_name(requester));
72 XBT_DEBUG("Sending '%s' to channel '%s'", task->name, channel);
73 MSG_task_send(task, channel);
78 XBT_DEBUG("Time is up. Let's tell everybody the computation is over.");
79 for (int i = 0; i < workers_count; i++) { /* We don't write in order, but the total amount is right */
81 /* Don't write to a worker that did not request for work, or it will deadlock: both would be sending something */
82 msg_task_t request = NULL;
83 int res = MSG_task_receive(&(request), master_name);
84 xbt_assert(res == MSG_OK, "MSG_task_receive failed");
85 msg_host_t requester = MSG_task_get_data(request);
86 MSG_task_destroy(request);
88 XBT_DEBUG("Stop worker %s", MSG_host_get_name(requester));
89 msg_task_t finalize = MSG_task_create("finalize", 0, 0, FINALIZE);
90 MSG_task_send(finalize, build_channel_name(channel, master_name, MSG_host_get_name(requester)));
93 XBT_INFO("Sent %d tasks in total!", task_num);
98 /** Worker function */
99 static int worker(int argc, char* argv[])
103 const char* my_master = MSG_process_get_data(MSG_process_self());
104 build_channel_name(channel, my_master, MSG_host_get_name(MSG_host_self()));
106 XBT_DEBUG("Receiving on channel \"%s\"", channel);
110 XBT_DEBUG("Sent a request to my master on %s", my_master);
111 msg_task_t request = MSG_task_create("request", 0, 0, MSG_host_self());
112 MSG_task_send(request, my_master);
114 /* Wait for the answer */
115 msg_task_t task = NULL;
116 int res = MSG_task_receive(&(task), channel);
117 xbt_assert(res == MSG_OK, "MSG_task_receive failed");
119 XBT_DEBUG("Received '%s'", MSG_task_get_name(task));
120 if (!strcmp(MSG_task_get_name(task), "finalize")) {
121 MSG_task_destroy(task);
125 XBT_DEBUG("Processing '%s'", MSG_task_get_name(task));
126 MSG_task_execute(task);
127 XBT_DEBUG("'%s' done", MSG_task_get_name(task));
128 MSG_task_destroy(task);
130 XBT_DEBUG("I'm done. See you!");
135 int main(int argc, char* argv[])
137 MSG_init(&argc, argv);
139 "Usage: %s platform_file deployment_file\n"
140 "\tExample: %s msg_platform.xml msg_deployment.xml\n",
143 /* Create a simulated platform */
144 MSG_create_environment(argv[1]);
146 /* Application deployment */
147 MSG_function_register("master", master);
148 MSG_function_register("worker", worker);
149 MSG_launch_application(argv[2]);
151 /* Run the simulation */
152 msg_error_t res = MSG_main();
154 XBT_INFO("Simulation time %g", MSG_get_clock());
155 return (res != MSG_OK);