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src/org/cloudbus/cloudsim/power/PowerVmAllocationPolicyMigrationInterQuartileRange.java

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+/*
+ * 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.Host;
+import org.cloudbus.cloudsim.Log;
+import org.cloudbus.cloudsim.Vm;
+import org.cloudbus.cloudsim.util.MathUtil;
+
+/**
+ * The Inter Quartile Range (IQR) VM allocation policy.
+ * 
+ * If you are using any algorithms, policies or workload included in the power package, please cite
+ * the following paper:
+ * 
+ * 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
+ * 
+ * @author Anton Beloglazov
+ * @since CloudSim Toolkit 3.0
+ */
+public class PowerVmAllocationPolicyMigrationInterQuartileRange extends
+		PowerVmAllocationPolicyMigrationAbstract {
+
+	/** The safety parameter. */
+	private double safetyParameter = 0;
+
+	/** The fallback vm allocation policy. */
+	private PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy;
+
+	/**
+	 * Instantiates a new power vm allocation policy migration mad.
+	 * 
+	 * @param hostList the host list
+	 * @param vmSelectionPolicy the vm selection policy
+	 * @param safetyParameter the safety parameter
+	 * @param utilizationThreshold the utilization threshold
+	 */
+	public PowerVmAllocationPolicyMigrationInterQuartileRange(
+			List<? extends Host> hostList,
+			PowerVmSelectionPolicy vmSelectionPolicy,
+			double safetyParameter,
+			PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy,
+			double utilizationThreshold) {
+		super(hostList, vmSelectionPolicy);
+		setSafetyParameter(safetyParameter);
+		setFallbackVmAllocationPolicy(fallbackVmAllocationPolicy);
+	}
+
+	/**
+	 * Instantiates a new power vm allocation policy migration mad.
+	 * 
+	 * @param hostList the host list
+	 * @param vmSelectionPolicy the vm selection policy
+	 * @param safetyParameter the safety parameter
+	 */
+	public PowerVmAllocationPolicyMigrationInterQuartileRange(
+			List<? extends Host> hostList,
+			PowerVmSelectionPolicy vmSelectionPolicy,
+			double safetyParameter,
+			PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy) {
+		super(hostList, vmSelectionPolicy);
+		setSafetyParameter(safetyParameter);
+		setFallbackVmAllocationPolicy(fallbackVmAllocationPolicy);
+	}
+
+	/**
+	 * Checks if is host over utilized.
+	 * 
+	 * @param _host the _host
+	 * @return true, if is host over utilized
+	 */
+	@Override
+	protected boolean isHostOverUtilized(PowerHost host) {
+		PowerHostUtilizationHistory _host = (PowerHostUtilizationHistory) host;
+		double upperThreshold = 0;
+		try {
+			upperThreshold = 1 - getSafetyParameter() * getHostUtilizationIqr(_host);
+		} catch (IllegalArgumentException e) {
+			return getFallbackVmAllocationPolicy().isHostOverUtilized(host);
+		}
+		addHistoryEntry(host, upperThreshold);
+		double totalRequestedMips = 0;
+		for (Vm vm : host.getVmList()) {
+			totalRequestedMips += vm.getCurrentRequestedTotalMips();
+		}
+		double utilization = totalRequestedMips / host.getTotalMips();
+		return utilization > upperThreshold;
+	}
+
+	/**
+	 * Gets the host utilization iqr.
+	 * 
+	 * @param host the host
+	 * @return the host utilization iqr
+	 */
+	protected double getHostUtilizationIqr(PowerHostUtilizationHistory host) throws IllegalArgumentException {
+		double[] data = host.getUtilizationHistory();
+		if (MathUtil.countNonZeroBeginning(data) >= 12) { // 12 has been suggested as a safe value
+			return MathUtil.iqr(data);
+		}
+		throw new IllegalArgumentException();
+	}
+
+	/**
+	 * Sets the safety parameter.
+	 * 
+	 * @param safetyParameter the new safety parameter
+	 */
+	protected void setSafetyParameter(double safetyParameter) {
+		if (safetyParameter < 0) {
+			Log.printLine("The safety parameter cannot be less than zero. The passed value is: "
+					+ safetyParameter);
+			System.exit(0);
+		}
+		this.safetyParameter = safetyParameter;
+	}
+
+	/**
+	 * Gets the safety parameter.
+	 * 
+	 * @return the safety parameter
+	 */
+	protected double getSafetyParameter() {
+		return safetyParameter;
+	}
+
+	/**
+	 * Sets the fallback vm allocation policy.
+	 * 
+	 * @param fallbackVmAllocationPolicy the new fallback vm allocation policy
+	 */
+	public void setFallbackVmAllocationPolicy(
+			PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy) {
+		this.fallbackVmAllocationPolicy = fallbackVmAllocationPolicy;
+	}
+
+	/**
+	 * Gets the fallback vm allocation policy.
+	 * 
+	 * @return the fallback vm allocation policy
+	 */
+	public PowerVmAllocationPolicyMigrationAbstract getFallbackVmAllocationPolicy() {
+		return fallbackVmAllocationPolicy;
+	}
+
+}