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src/org/cloudbus/cloudsim/power/PowerVmAllocationPolicyMigrationLocalRegression.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.Vm;
+import org.cloudbus.cloudsim.util.MathUtil;
+
+/**
+ * The Local Regression (LR) 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 PowerVmAllocationPolicyMigrationLocalRegression extends PowerVmAllocationPolicyMigrationAbstract {
+
+	/** The scheduling interval. */
+	private double schedulingInterval;
+
+	/** The safety parameter. */
+	private double safetyParameter;
+
+	/** The fallback vm allocation policy. */
+	private PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy;
+
+	/**
+	 * Instantiates a new power vm allocation policy migration local regression.
+	 * 
+	 * @param hostList the host list
+	 * @param vmSelectionPolicy the vm selection policy
+	 * @param schedulingInterval the scheduling interval
+	 * @param fallbackVmAllocationPolicy the fallback vm allocation policy
+	 * @param utilizationThreshold the utilization threshold
+	 */
+	public PowerVmAllocationPolicyMigrationLocalRegression(
+			List<? extends Host> hostList,
+			PowerVmSelectionPolicy vmSelectionPolicy,
+			double safetyParameter,
+			double schedulingInterval,
+			PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy,
+			double utilizationThreshold) {
+		super(hostList, vmSelectionPolicy);
+		setSafetyParameter(safetyParameter);
+		setSchedulingInterval(schedulingInterval);
+		setFallbackVmAllocationPolicy(fallbackVmAllocationPolicy);
+	}
+
+	/**
+	 * Instantiates a new power vm allocation policy migration local regression.
+	 * 
+	 * @param hostList the host list
+	 * @param vmSelectionPolicy the vm selection policy
+	 * @param schedulingInterval the scheduling interval
+	 * @param fallbackVmAllocationPolicy the fallback vm allocation policy
+	 */
+	public PowerVmAllocationPolicyMigrationLocalRegression(
+			List<? extends Host> hostList,
+			PowerVmSelectionPolicy vmSelectionPolicy,
+			double safetyParameter,
+			double schedulingInterval,
+			PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy) {
+		super(hostList, vmSelectionPolicy);
+		setSafetyParameter(safetyParameter);
+		setSchedulingInterval(schedulingInterval);
+		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[] utilizationHistory = _host.getUtilizationHistory();
+		int length = 10; // we use 10 to make the regression responsive enough to latest values
+		if (utilizationHistory.length < length) {
+			return getFallbackVmAllocationPolicy().isHostOverUtilized(host);
+		}
+		double[] utilizationHistoryReversed = new double[length];
+		for (int i = 0; i < length; i++) {
+			utilizationHistoryReversed[i] = utilizationHistory[length - i - 1];
+		}
+		double[] estimates = null;
+		try {
+			estimates = getParameterEstimates(utilizationHistoryReversed);
+		} catch (IllegalArgumentException e) {
+			return getFallbackVmAllocationPolicy().isHostOverUtilized(host);
+		}
+		double migrationIntervals = Math.ceil(getMaximumVmMigrationTime(_host) / getSchedulingInterval());
+		double predictedUtilization = estimates[0] + estimates[1] * (length + migrationIntervals);
+		predictedUtilization *= getSafetyParameter();
+
+		addHistoryEntry(host, predictedUtilization);
+
+		return predictedUtilization >= 1;
+	}
+
+	/**
+	 * Gets the parameter estimates.
+	 * 
+	 * @param utilizationHistoryReversed the utilization history reversed
+	 * @return the parameter estimates
+	 */
+	protected double[] getParameterEstimates(double[] utilizationHistoryReversed) {
+		return MathUtil.getLoessParameterEstimates(utilizationHistoryReversed);
+	}
+
+	/**
+	 * Gets the maximum vm migration time.
+	 * 
+	 * @param host the host
+	 * @return the maximum vm migration time
+	 */
+	protected double getMaximumVmMigrationTime(PowerHost host) {
+		int maxRam = Integer.MIN_VALUE;
+		for (Vm vm : host.getVmList()) {
+			int ram = vm.getRam();
+			if (ram > maxRam) {
+				maxRam = ram;
+			}
+		}
+		return maxRam / ((double) host.getBw() / (2 * 8000));
+	}
+
+	/**
+	 * Sets the scheduling interval.
+	 * 
+	 * @param schedulingInterval the new scheduling interval
+	 */
+	protected void setSchedulingInterval(double schedulingInterval) {
+		this.schedulingInterval = schedulingInterval;
+	}
+
+	/**
+	 * Gets the scheduling interval.
+	 * 
+	 * @return the scheduling interval
+	 */
+	protected double getSchedulingInterval() {
+		return schedulingInterval;
+	}
+
+	/**
+	 * 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;
+	}
+
+	public double getSafetyParameter() {
+		return safetyParameter;
+	}
+
+	public void setSafetyParameter(double safetyParameter) {
+		this.safetyParameter = safetyParameter;
+	}
+
+}