examples/s4u/exec-dvfs/s4u-exec-dvfs.cpp

   1 /* Copyright (c) 2007-2019. 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/s4u.hpp"
   7
   8 XBT_LOG_NEW_DEFAULT_CATEGORY(test, "Pstate properties test");
   9
  10 static int dvfs()
  11 {
  12   double workload = 100E6;
  13   simgrid::s4u::Host* host = simgrid::s4u::this_actor::get_host();
  14
  15   int nb = host->get_pstate_count();
  16   XBT_INFO("Count of Processor states=%d", nb);
  17
  18   XBT_INFO("Current power peak=%f", host->get_speed());
  19
  20   // Run a task
  21   simgrid::s4u::this_actor::execute(workload);
  22
  23   double task_time = simgrid::s4u::Engine::get_clock();
  24   XBT_INFO("Task1 duration: %.2f", task_time);
  25
  26   // Change power peak
  27   int new_pstate = 2;
  28
  29   XBT_INFO("Changing power peak value to %f (at index %d)", host->get_pstate_speed(new_pstate), new_pstate);
  30
  31   host->set_pstate(new_pstate);
  32
  33   XBT_INFO("Current power peak=%f", host->get_speed());
  34
  35   // Run a second task
  36   simgrid::s4u::this_actor::execute(workload);
  37
  38   task_time = simgrid::s4u::Engine::get_clock() - task_time;
  39   XBT_INFO("Task2 duration: %.2f", task_time);
  40
  41   // Verify that the default pstate is set to 0
  42   host = simgrid::s4u::Host::by_name_or_null("MyHost2");
  43   XBT_INFO("Count of Processor states=%d", host->get_pstate_count());
  44
  45   XBT_INFO("Current power peak=%f", host->get_speed());
  46   return 0;
  47 }
  48
  49 int main(int argc, char* argv[])
  50 {
  51   simgrid::s4u::Engine e(&argc, argv);
  52
  53   xbt_assert(argc == 2, "Usage: %s platform_file\n\tExample: %s msg_platform.xml\n", argv[0], argv[0]);
  54
  55   e.load_platform(argv[1]);
  56
  57   simgrid::s4u::Actor::create("dvfs_test", simgrid::s4u::Host::by_name("MyHost1"), dvfs);
  58   simgrid::s4u::Actor::create("dvfs_test", simgrid::s4u::Host::by_name("MyHost2"), dvfs);
  59
  60   e.run();
  61
  62   XBT_INFO("Total simulation time: %e", e.get_clock());
  63
  64   return 0;
  65 }