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

   1 /* Copyright (c) 2007-2017. 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(std::vector<std::string> args)
  11 {
  12   double workload = 100E6;
  13   sg_host_t host = simgrid::s4u::this_actor::getHost();
  14
  15   int nb = sg_host_get_nb_pstates(host);
  16   XBT_INFO("Count of Processor states=%d", nb);
  17
  18   XBT_INFO("Current power peak=%f", host->getSpeed());
  19
  20   // Run a task
  21   simgrid::s4u::this_actor::execute(workload);
  22
  23   double task_time = simgrid::s4u::Engine::getClock();
  24   XBT_INFO("Task1 simulation time: %e", 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->getPstateSpeed(new_pstate), new_pstate);
  30
  31   sg_host_set_pstate(host, new_pstate);
  32
  33   XBT_INFO("Current power peak=%f", host->getSpeed());
  34
  35   // Run a second task
  36   simgrid::s4u::this_actor::execute(workload);
  37
  38   task_time = simgrid::s4u::Engine::getClock() - task_time;
  39   XBT_INFO("Task2 simulation time: %e", task_time);
  40
  41   // Verify 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", sg_host_get_nb_pstates(host));
  44
  45   XBT_INFO("Current power peak=%f", host->getSpeed());
  46   return 0;
  47 }
  48
  49 int main(int argc, char *argv[])
  50 {
  51   simgrid::s4u::Engine e(&argc, argv);
  52   std::vector<std::string> args;
  53
  54   xbt_assert(argc == 2, "Usage: %s platform_file\n\tExample: %s msg_platform.xml\n", argv[0], argv[0]);
  55
  56    e.loadPlatform(argv[1]); /* - Load the platform description */
  57
  58    simgrid::s4u::Actor::createActor("dvfs_test", simgrid::s4u::Host::by_name("MyHost1"), dvfs, args);
  59    simgrid::s4u::Actor::createActor("dvfs_test", simgrid::s4u::Host::by_name("MyHost2"), dvfs, args);
  60
  61    e.run();
  62
  63   XBT_INFO("Total simulation time: %e", e.getClock());
  64
  65   return 0;
  66 }