/*
* Title: CloudSim Toolkit
* Description: CloudSim (Cloud Simulation) Toolkit for Modeling and Simulation of Clouds
* Licence: GPL - http://www.gnu.org/copyleft/gpl.html
*
* Copyright (c) 2009-2012, The University of Melbourne, Australia
*/
package org.cloudbus.cloudsim.power;
import java.util.List;
import org.cloudbus.cloudsim.Pe;
import org.cloudbus.cloudsim.VmScheduler;
import org.cloudbus.cloudsim.power.models.PowerModel;
import org.cloudbus.cloudsim.provisioners.BwProvisioner;
import org.cloudbus.cloudsim.provisioners.RamProvisioner;
import org.cloudbus.cloudsim.util.MathUtil;
/**
* A host that stores its CPU utilization percentage history. The history is used by VM allocation
* and selection policies.
*
* <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/>
*
* <ul>
* <li><a href="http://dx.doi.org/10.1002/cpe.1867">Anton Beloglazov, and Rajkumar Buyya, "Optimal Online Deterministic Algorithms and Adaptive
* Heuristics for Energy and Performance Efficient Dynamic Consolidation of Virtual Machines in
* Cloud Data Centers", Concurrency and Computation: Practice and Experience (CCPE), Volume 24,
* Issue 13, Pages: 1397-1420, John Wiley & Sons, Ltd, New York, USA, 2012</a>
* </ul>
*
* @author Anton Beloglazov
* @since CloudSim Toolkit 2.0
*/
public class PowerHostUtilizationHistory extends PowerHost {
/**
* Instantiates a new PowerHostUtilizationHistory.
*
* @param id the host id
* @param ramProvisioner the ram provisioner
* @param bwProvisioner the bw provisioner
* @param storage the storage capacity
* @param peList the host's PEs list
* @param vmScheduler the vm scheduler
* @param powerModel the power consumption model
*/
public PowerHostUtilizationHistory(
int id,
RamProvisioner ramProvisioner,
BwProvisioner bwProvisioner,
long storage,
List<? extends Pe> peList,
VmScheduler vmScheduler,
PowerModel powerModel) {
super(id, ramProvisioner, bwProvisioner, storage, peList, vmScheduler, powerModel);
}
/**
* Gets the host CPU utilization percentage history.
*
* @return the host CPU utilization percentage history
*/
protected double[] getUtilizationHistory() {
double[] utilizationHistory = new double[PowerVm.HISTORY_LENGTH];
double hostMips = getTotalMips();
for (PowerVm vm : this.<PowerVm> getVmList()) {
for (int i = 0; i < vm.getUtilizationHistory().size(); i++) {
utilizationHistory[i] += vm.getUtilizationHistory().get(i) * vm.getMips() / hostMips;
}
}
return MathUtil.trimZeroTail(utilizationHistory);
}
}