examples/s4u/energy-pstate/s4u-energy-pstate.cpp

   1 /* Copyright (c) 2007-2010, 2013-2015. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   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. */
   6
   7  #include "simgrid/s4u.hpp"
   8
   9 XBT_LOG_NEW_DEFAULT_CATEGORY(test, "Pstate properties test");
  10
  11 static int dvfs(std::vector<std::string> args)
  12 {
  13   double workload = 100E6;
  14   sg_host_t host = simgrid::s4u::this_actor::getHost();
  15
  16   int nb = sg_host_get_nb_pstates(host);
  17   XBT_INFO("Count of Processor states=%d", nb);
  18
  19   XBT_INFO("Current power peak=%f", host->getSpeed());
  20
  21   // Run a task
  22   simgrid::s4u::this_actor::execute(workload);
  23
  24   double task_time = simgrid::s4u::Engine::getClock();
  25   XBT_INFO("Task1 simulation time: %e", task_time);
  26
  27   // Change power peak
  28   int new_pstate = 2;
  29
  30   XBT_INFO("Changing power peak value to %f (at index %d)", host->getPstateSpeed(new_pstate), new_pstate);
  31
  32   sg_host_set_pstate(host, new_pstate);
  33
  34   XBT_INFO("Current power peak=%f", host->getSpeed());
  35
  36   // Run a second task
  37   simgrid::s4u::this_actor::execute(workload);
  38
  39   task_time = simgrid::s4u::Engine::getClock() - task_time;
  40   XBT_INFO("Task2 simulation time: %e", task_time);
  41
  42   // Verify the default pstate is set to 0
  43   host = simgrid::s4u::Host::by_name_or_null("MyHost2");
  44   XBT_INFO("Count of Processor states=%d", sg_host_get_nb_pstates(host));
  45
  46   XBT_INFO("Current power peak=%f", host->getSpeed());
  47   return 0;
  48 }
  49
  50 int main(int argc, char *argv[])
  51 {
  52   simgrid::s4u::Engine e(&argc, argv);
  53   std::vector<std::string> args;
  54
  55   xbt_assert(argc == 2, "Usage: %s platform_file\n\tExample: %s msg_platform.xml\n", argv[0], argv[0]);
  56
  57    e.loadPlatform(argv[1]); /* - Load the platform description */
  58
  59    simgrid::s4u::Actor::createActor("dvfs_test", simgrid::s4u::Host::by_name("MyHost1"), dvfs, args);
  60    simgrid::s4u::Actor::createActor("dvfs_test", simgrid::s4u::Host::by_name("MyHost2"), dvfs, args);
  61
  62    e.run();
  63
  64   XBT_INFO("Total simulation time: %e", e.getClock());
  65
  66   return 0;
  67 }