examples/c/comm-pingpong/comm-pingpong.c

   1 /* Copyright (c) 2007-2021. The SimGrid Team. All rights reserved.          */
   2
   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. */
   5
   6 #include "simgrid/actor.h"
   7 #include "simgrid/comm.h"
   8 #include "simgrid/engine.h"
   9 #include "simgrid/forward.h"
  10 #include "simgrid/mailbox.h"
  11 #include "xbt/asserts.h"
  12 #include "xbt/log.h"
  13 #include "xbt/str.h"
  14
  15 #include <stdio.h> /* snprintf */
  16
  17 XBT_LOG_NEW_DEFAULT_CATEGORY(app_pingpong, "Messages specific for this example");
  18
  19 static void pinger(int argc, char* argv[])
  20 {
  21   sg_mailbox_t mailbox_in  = sg_mailbox_by_name("Mailbox 1");
  22   sg_mailbox_t mailbox_out = sg_mailbox_by_name("Mailbox 2");
  23
  24   XBT_INFO("Ping from mailbox %s to mailbox %s", sg_mailbox_get_name(mailbox_in), sg_mailbox_get_name(mailbox_out));
  25
  26   /* - Do the ping with a 1-Byte task (latency bound) ... */
  27   double* now = (double*)xbt_malloc(sizeof(double));
  28   *now        = simgrid_get_clock();
  29   sg_mailbox_put(mailbox_out, now, 1);
  30
  31   /* - ... then wait for the (large) pong */
  32   double* sender_time = (double*)sg_mailbox_get(mailbox_in);
  33
  34   double communication_time = simgrid_get_clock() - *sender_time;
  35   XBT_INFO("Task received : large communication (bandwidth bound)");
  36   XBT_INFO("Pong time (bandwidth bound): %.3f", communication_time);
  37   xbt_free(sender_time);
  38 }
  39
  40 static void ponger(int argc, char* argv[])
  41 {
  42   sg_mailbox_t mailbox_in  = sg_mailbox_by_name("Mailbox 2");
  43   sg_mailbox_t mailbox_out = sg_mailbox_by_name("Mailbox 1");
  44
  45   XBT_INFO("Pong from mailbox %s to mailbox %s", sg_mailbox_get_name(mailbox_in), sg_mailbox_get_name(mailbox_out));
  46
  47   /* - Receive the (small) ping first ....*/
  48   double* sender_time       = (double*)sg_mailbox_get(mailbox_in);
  49   double communication_time = simgrid_get_clock() - *sender_time;
  50   XBT_INFO("Task received : small communication (latency bound)");
  51   XBT_INFO(" Ping time (latency bound) %f", communication_time);
  52   xbt_free(sender_time);
  53
  54   /*  - ... Then send a 1GB pong back (bandwidth bound) */
  55   double* payload = (double*)xbt_malloc(sizeof(double));
  56   *payload        = simgrid_get_clock();
  57   XBT_INFO("task_bw->data = %.3f", *payload);
  58   sg_mailbox_put(mailbox_out, payload, 1e9);
  59 }
  60
  61 int main(int argc, char* argv[])
  62 {
  63   simgrid_init(&argc, argv);
  64   xbt_assert(argc > 2,
  65              "Usage: %s platform_file deployment_file\n"
  66              "\tExample: %s ../../platforms/small_platform.xml app-pingpong_d.xml\n",
  67              argv[0], argv[0]);
  68
  69   simgrid_load_platform(argv[1]);
  70
  71   simgrid_register_function("pinger", pinger);
  72   simgrid_register_function("ponger", ponger);
  73   simgrid_load_deployment(argv[2]);
  74
  75   simgrid_run();
  76
  77   XBT_INFO("Total simulation time: %.3f", simgrid_get_clock());
  78
  79   return 0;
  80 }