examples/java/energy/pstate/PstateRunner.java

   1 /* Copyright (c) 2016-2018. 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 package energy.pstate;
   7
   8 import org.simgrid.msg.Host;
   9 import org.simgrid.msg.HostFailureException;
  10 import org.simgrid.msg.HostNotFoundException;
  11 import org.simgrid.msg.Msg;
  12 import org.simgrid.msg.Process;
  13 import org.simgrid.msg.Task;
  14 import org.simgrid.msg.TaskCancelledException;
  15
  16 /* This class is a process in charge of running the test. It creates and starts the VMs, and fork processes within VMs */
  17 public class PstateRunner extends Process {
  18
  19         public class DVFS extends Process {
  20                 public  DVFS (Host host, String name) {
  21                         super(host, name);
  22                 }
  23
  24                 @Override
  25                 public void main(String[] strings) throws HostNotFoundException, HostFailureException, TaskCancelledException {
  26                         double workload = 100E6;
  27                         int newPstate = 2;
  28                         Host host = getHost();
  29
  30                         int nb = host.getPstatesCount();
  31                         Msg.info("Count of Processor states="+ nb);
  32
  33                         double currentPeak = host.getCurrentPowerPeak();
  34                         Msg.info("Current power peak=" + currentPeak);
  35
  36                         // Run a task
  37                         Task task1 = new Task("t1", workload, 0);
  38                         task1.execute();
  39
  40                         double taskTime = Msg.getClock();
  41                         Msg.info("Task1 simulation time: "+ taskTime);
  42
  43                         // Change power peak
  44                         if ((newPstate >= nb) || (newPstate < 0)){
  45                                 Msg.info("Cannot set pstate "+newPstate+"%d, host supports only "+nb+" pstates.");
  46                                 return;
  47                         }
  48
  49                         double peakAt = host.getPowerPeakAt(newPstate);
  50                         Msg.info("Changing power peak value to "+peakAt+" (at index "+newPstate+")");
  51
  52                         host.setPstate(newPstate);
  53
  54                         currentPeak = host.getCurrentPowerPeak();
  55                         Msg.info("Current power peak="+ currentPeak);
  56
  57                         // Run a second task
  58                         new Task("t1", workload, 0).execute();
  59
  60                         taskTime = Msg.getClock() - taskTime;
  61                         Msg.info("Task2 simulation time: "+ taskTime);
  62
  63                         // Verify the default pstate is set to 0
  64                         host = Host.getByName("MyHost2");
  65                         int nb2 = host.getPstatesCount();
  66                         Msg.info("Count of Processor states="+ nb2);
  67
  68                         double currentPeak2 = host.getCurrentPowerPeak();
  69                         Msg.info("Current power peak=" + currentPeak2);
  70                 }
  71         }
  72
  73         PstateRunner(Host host, String name, String[] args) {
  74                 super(host, name, args);
  75         }
  76
  77         @Override
  78         public void main(String[] strings) throws HostNotFoundException, HostFailureException {
  79
  80             new DVFS (Host.getByName("MyHost1"), "dvfs_test").start();
  81             new DVFS (Host.getByName("MyHost2"), "dvfs_test").start();
  82
  83         }
  84 }