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src/org/cloudbus/cloudsim/power/PowerHostUtilizationHistory.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.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;
+
+/**
+ * The class of a host that stores its CPU utilization history. The history is used by VM allocation
+ * and selection policies.
+ * 
+ * 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 2.0
+ */
+public class PowerHostUtilizationHistory extends PowerHost {
+
+	/**
+	 * Instantiates a new power host utilization history.
+	 * 
+	 * @param id the id
+	 * @param ramProvisioner the ram provisioner
+	 * @param bwProvisioner the bw provisioner
+	 * @param storage the storage
+	 * @param peList the pe list
+	 * @param vmScheduler the vm scheduler
+	 * @param powerModel the power 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 utilization history.
+	 * 
+	 * @return the host utilization 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);
+	}
+
+}