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 /** @addtogroup MSG_examples
11 * @example app-pingpong/app-pingpong.c
13 * - <b>Ping-Pong: app-pingpong/app-pingpong.c</b>. It's hard to think of a simpler example. The tesh file
14 * laying in the directory is instructive concerning the way to pass options to the simulators (see \ref options).
17 XBT_LOG_NEW_DEFAULT_CATEGORY(mag_app_pingpong,"Messages specific for this msg example");
19 static int pinger(int argc, char *argv[])
21 XBT_INFO("Ping -> %s", argv[1]);
22 xbt_assert(MSG_host_by_name(argv[1]) != NULL, "Unknown host %s. Stopping Now! ", argv[1]);
24 /* - Do the ping with a 1-Byte task (latency bound) ... */
25 double time = MSG_get_clock();
26 msg_task_t ping_task = MSG_task_create("small communication (latency bound)", 0.0, 1, NULL);
27 ping_task->data = xbt_new(double, 1);
28 *(double *) ping_task->data = time;
29 MSG_task_send(ping_task, argv[1]);
31 /* - ... then wait for the (large) pong */
32 msg_task_t pong_task = NULL;
33 int a = MSG_task_receive(&pong_task,MSG_host_get_name(MSG_host_self()));
34 xbt_assert(a == MSG_OK, "Unexpected behavior");
36 double sender_time = *((double *) (pong_task->data));
37 double communication_time = MSG_get_clock() - sender_time;
38 XBT_INFO("Task received : %s", pong_task->name);
39 xbt_free(pong_task->data);
40 MSG_task_destroy(pong_task);
41 XBT_INFO("Pong time (bandwidth bound): %e", communication_time);
46 static int ponger(int argc, char *argv[])
48 XBT_INFO("Pong -> %s", argv[1]);
49 xbt_assert(MSG_host_by_name(argv[1]) != NULL, "Unknown host %s. Stopping Now! ", argv[1]);
51 /** - Receive the (small) ping first ....*/
52 msg_task_t ping_task = NULL;
53 int a = MSG_task_receive(&ping_task, MSG_host_get_name(MSG_host_self()));
54 xbt_assert(a == MSG_OK, "Unexpected behavior");
56 double sender_time = *((double *) (ping_task->data));
57 double communication_time = MSG_get_clock() - sender_time;
58 XBT_INFO("Task received : %s", ping_task->name);
59 xbt_free(ping_task->data);
60 MSG_task_destroy(ping_task);
61 XBT_INFO(" Ping time (latency bound) %e", communication_time);
63 /** - ... Then send a 1GB pong back (bandwidth bound) */
64 double time = MSG_get_clock();
65 msg_task_t pong_task = MSG_task_create("large communication (bandwidth bound)", 0.0, 1e9, NULL);
66 pong_task->data = xbt_new(double, 1);
67 *(double *) pong_task->data = time;
68 XBT_INFO("task_bw->data = %e", *((double *) pong_task->data));
69 MSG_task_send(pong_task, argv[1]);
74 int main(int argc, char *argv[])
76 msg_error_t res = MSG_OK;
78 MSG_init(&argc, argv);
80 xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n"
81 "\tExample: %s ../../platform/small_platform.xml app-pingpong_d.xml\n", argv[0], argv[0]);
83 MSG_create_environment(argv[1]); /** - Load the platform description */
85 MSG_function_register("pinger", pinger); /** - Register the function to be executed by the processes */
86 MSG_function_register("ponger", ponger);
88 MSG_launch_application(argv[2]); /** - Deploy the application */
90 res = MSG_main(); /** - Run the simulation */
92 XBT_INFO("Total simulation time: %e", MSG_get_clock());