Commit 35c31997 authored by Manoel Campos's avatar Manoel Campos

Documentation of package org.cloudbus.cloudsim.power improved.

This was the last package updated from the 12 CloudSim packages.
parent e5529283
...@@ -65,7 +65,7 @@ public class Host { ...@@ -65,7 +65,7 @@ public class Host {
* @param ramProvisioner the ram provisioner * @param ramProvisioner the ram provisioner
* @param bwProvisioner the bw provisioner * @param bwProvisioner the bw provisioner
* @param storage the storage capacity * @param storage the storage capacity
* @param peList the pe list * @param peList the host's PEs list
* @param vmScheduler the vm scheduler * @param vmScheduler the vm scheduler
*/ */
public Host( public Host(
......
...@@ -18,7 +18,7 @@ import org.cloudbus.cloudsim.provisioners.BwProvisioner; ...@@ -18,7 +18,7 @@ import org.cloudbus.cloudsim.provisioners.BwProvisioner;
import org.cloudbus.cloudsim.provisioners.RamProvisioner; import org.cloudbus.cloudsim.provisioners.RamProvisioner;
/** /**
* The class of a host supporting dynamic workloads and performance degradation. * A host supporting dynamic workloads and performance degradation.
* *
* @author Anton Beloglazov * @author Anton Beloglazov
* @since CloudSim Toolkit 2.0 * @since CloudSim Toolkit 2.0
...@@ -40,8 +40,8 @@ public class HostDynamicWorkload extends Host { ...@@ -40,8 +40,8 @@ public class HostDynamicWorkload extends Host {
* @param id the id * @param id the id
* @param ramProvisioner the ram provisioner * @param ramProvisioner the ram provisioner
* @param bwProvisioner the bw provisioner * @param bwProvisioner the bw provisioner
* @param storage the storage * @param storage the storage capacity
* @param peList the pe list * @param peList the host's PEs list
* @param vmScheduler the VM scheduler * @param vmScheduler the VM scheduler
*/ */
public HostDynamicWorkload( public HostDynamicWorkload(
......
...@@ -13,8 +13,9 @@ import java.util.Map; ...@@ -13,8 +13,9 @@ import java.util.Map;
/** /**
* VmAllocationPolicy is an abstract class that represents the provisioning policy of hosts to * VmAllocationPolicy is an abstract class that represents the provisioning policy of hosts to
* virtual machines in a Datacenter. It supports two-stage commit of reservation of hosts: first, we * virtual machines in a Datacenter. It allocates hosts for placing VMs.
* reserve the host and, once commited by the user, it is effectivelly allocated to he/she * It supports two-stage commit of reservation of hosts: first, we
* reserve the host and, once committed by the user, it is effectively allocated to he/she.
* *
* @author Rodrigo N. Calheiros * @author Rodrigo N. Calheiros
* @author Anton Beloglazov * @author Anton Beloglazov
......
...@@ -40,25 +40,24 @@ import org.cloudbus.cloudsim.core.predicates.PredicateType; ...@@ -40,25 +40,24 @@ import org.cloudbus.cloudsim.core.predicates.PredicateType;
*/ */
public class PowerDatacenter extends Datacenter { public class PowerDatacenter extends Datacenter {
/** The power. */ /** The datacenter consumed power. */
private double power; private double power;
/** The disable migrations. */ /** Indicates if migrations are disabled or not. */
private boolean disableMigrations; private boolean disableMigrations;
/** The cloudlet submited. */ /** The last time submitted cloudlets were processed. */
private double cloudletSubmitted; private double cloudletSubmitted;
/** The migration count. */ /** The VM migration count. */
private int migrationCount; private int migrationCount;
/** /**
* Instantiates a new datacenter. * Instantiates a new PowerDatacenter.
* *
* @param name the name * @param name the datacenter name
* @param characteristics the res config * @param characteristics the datacenter characteristics
* @param schedulingInterval the scheduling interval * @param schedulingInterval the scheduling interval
* @param utilizationBound the utilization bound
* @param vmAllocationPolicy the vm provisioner * @param vmAllocationPolicy the vm provisioner
* @param storageList the storage list * @param storageList the storage list
* @throws Exception the exception * @throws Exception the exception
...@@ -77,14 +76,6 @@ public class PowerDatacenter extends Datacenter { ...@@ -77,14 +76,6 @@ public class PowerDatacenter extends Datacenter {
setMigrationCount(0); setMigrationCount(0);
} }
/**
* Updates processing of each cloudlet running in this PowerDatacenter. It is necessary because
* Hosts and VirtualMachines are simple objects, not entities. So, they don't receive events and
* updating cloudlets inside them must be called from the outside.
*
* @pre $none
* @post $none
*/
@Override @Override
protected void updateCloudletProcessing() { protected void updateCloudletProcessing() {
if (getCloudletSubmitted() == -1 || getCloudletSubmitted() == CloudSim.clock()) { if (getCloudletSubmitted() == -1 || getCloudletSubmitted() == CloudSim.clock()) {
...@@ -155,6 +146,12 @@ public class PowerDatacenter extends Datacenter { ...@@ -155,6 +146,12 @@ public class PowerDatacenter extends Datacenter {
* Update cloudet processing without scheduling future events. * Update cloudet processing without scheduling future events.
* *
* @return the double * @return the double
* @see #updateCloudetProcessingWithoutSchedulingFutureEventsForce()
* @todo There is an inconsistence in the return value of this
* method with return value of similar methods
* such as {@link #updateCloudetProcessingWithoutSchedulingFutureEventsForce()},
* that returns {@link Double#MAX_VALUE} by default.
* The current method returns 0 by default.
*/ */
protected double updateCloudetProcessingWithoutSchedulingFutureEvents() { protected double updateCloudetProcessingWithoutSchedulingFutureEvents() {
if (CloudSim.clock() > getLastProcessTime()) { if (CloudSim.clock() > getLastProcessTime()) {
...@@ -166,7 +163,8 @@ public class PowerDatacenter extends Datacenter { ...@@ -166,7 +163,8 @@ public class PowerDatacenter extends Datacenter {
/** /**
* Update cloudet processing without scheduling future events. * Update cloudet processing without scheduling future events.
* *
* @return the double * @return expected time of completion of the next cloudlet in all VMs of all hosts or
* {@link Double#MAX_VALUE} if there is no future events expected in this host
*/ */
protected double updateCloudetProcessingWithoutSchedulingFutureEventsForce() { protected double updateCloudetProcessingWithoutSchedulingFutureEventsForce() {
double currentTime = CloudSim.clock(); double currentTime = CloudSim.clock();
...@@ -284,7 +282,7 @@ public class PowerDatacenter extends Datacenter { ...@@ -284,7 +282,7 @@ public class PowerDatacenter extends Datacenter {
/** /**
* Checks if PowerDatacenter is in migration. * Checks if PowerDatacenter is in migration.
* *
* @return true, if PowerDatacenter is in migration * @return true, if PowerDatacenter is in migration; false otherwise
*/ */
protected boolean isInMigration() { protected boolean isInMigration() {
boolean result = false; boolean result = false;
...@@ -298,18 +296,18 @@ public class PowerDatacenter extends Datacenter { ...@@ -298,18 +296,18 @@ public class PowerDatacenter extends Datacenter {
} }
/** /**
* Checks if is disable migrations. * Checks if migrations are disabled.
* *
* @return true, if is disable migrations * @return true, if migrations are disable; false otherwise
*/ */
public boolean isDisableMigrations() { public boolean isDisableMigrations() {
return disableMigrations; return disableMigrations;
} }
/** /**
* Sets the disable migrations. * Disable or enable migrations.
* *
* @param disableMigrations the new disable migrations * @param disableMigrations true to disable migrations; false to enable
*/ */
public void setDisableMigrations(boolean disableMigrations) { public void setDisableMigrations(boolean disableMigrations) {
this.disableMigrations = disableMigrations; this.disableMigrations = disableMigrations;
...@@ -325,7 +323,7 @@ public class PowerDatacenter extends Datacenter { ...@@ -325,7 +323,7 @@ public class PowerDatacenter extends Datacenter {
} }
/** /**
* Sets the cloudlet submited. * Sets the cloudlet submitted.
* *
* @param cloudletSubmitted the new cloudlet submited * @param cloudletSubmitted the new cloudlet submited
*/ */
......
...@@ -14,7 +14,7 @@ import org.cloudbus.cloudsim.core.CloudSimTags; ...@@ -14,7 +14,7 @@ import org.cloudbus.cloudsim.core.CloudSimTags;
import org.cloudbus.cloudsim.core.SimEvent; import org.cloudbus.cloudsim.core.SimEvent;
/** /**
* A broker for the power package. * A power-aware {@link DatacenterBroker}.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
...@@ -32,9 +32,9 @@ import org.cloudbus.cloudsim.core.SimEvent; ...@@ -32,9 +32,9 @@ import org.cloudbus.cloudsim.core.SimEvent;
public class PowerDatacenterBroker extends DatacenterBroker { public class PowerDatacenterBroker extends DatacenterBroker {
/** /**
* Instantiates a new power datacenter broker. * Instantiates a new PowerDatacenterBroker.
* *
* @param name the name * @param name the name of the broker
* @throws Exception the exception * @throws Exception the exception
*/ */
public PowerDatacenterBroker(String name) throws Exception { public PowerDatacenterBroker(String name) throws Exception {
......
...@@ -21,7 +21,7 @@ import org.cloudbus.cloudsim.core.CloudSimTags; ...@@ -21,7 +21,7 @@ import org.cloudbus.cloudsim.core.CloudSimTags;
import org.cloudbus.cloudsim.core.predicates.PredicateType; import org.cloudbus.cloudsim.core.predicates.PredicateType;
/** /**
* PowerDatacenterNonPowerAware is a class that represents a non-power aware data center in the * PowerDatacenterNonPowerAware is a class that represents a <b>non-power</b> aware data center in the
* context of power-aware simulations. * context of power-aware simulations.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
...@@ -42,10 +42,9 @@ public class PowerDatacenterNonPowerAware extends PowerDatacenter { ...@@ -42,10 +42,9 @@ public class PowerDatacenterNonPowerAware extends PowerDatacenter {
/** /**
* Instantiates a new datacenter. * Instantiates a new datacenter.
* *
* @param name the name * @param name the datacenter name
* @param characteristics the res config * @param characteristics the datacenter characteristics
* @param schedulingInterval the scheduling interval * @param schedulingInterval the scheduling interval
* @param utilizationBound the utilization bound
* @param vmAllocationPolicy the vm provisioner * @param vmAllocationPolicy the vm provisioner
* @param storageList the storage list * @param storageList the storage list
* *
...@@ -60,14 +59,6 @@ public class PowerDatacenterNonPowerAware extends PowerDatacenter { ...@@ -60,14 +59,6 @@ public class PowerDatacenterNonPowerAware extends PowerDatacenter {
super(name, characteristics, vmAllocationPolicy, storageList, schedulingInterval); super(name, characteristics, vmAllocationPolicy, storageList, schedulingInterval);
} }
/**
* Updates processing of each cloudlet running in this PowerDatacenter. It is necessary because
* Hosts and VirtualMachines are simple objects, not entities. So, they don't receive events and
* updating cloudlets inside them must be called from the outside.
*
* @pre $none
* @post $none
*/
@Override @Override
protected void updateCloudletProcessing() { protected void updateCloudletProcessing() {
if (getCloudletSubmitted() == -1 || getCloudletSubmitted() == CloudSim.clock()) { if (getCloudletSubmitted() == -1 || getCloudletSubmitted() == CloudSim.clock()) {
......
...@@ -35,17 +35,17 @@ import org.cloudbus.cloudsim.provisioners.RamProvisioner; ...@@ -35,17 +35,17 @@ import org.cloudbus.cloudsim.provisioners.RamProvisioner;
*/ */
public class PowerHost extends HostDynamicWorkload { public class PowerHost extends HostDynamicWorkload {
/** The power model. */ /** The power model used by the host. */
private PowerModel powerModel; private PowerModel powerModel;
/** /**
* Instantiates a new host. * Instantiates a new PowerHost.
* *
* @param id the id * @param id the id of the host
* @param ramProvisioner the ram provisioner * @param ramProvisioner the ram provisioner
* @param bwProvisioner the bw provisioner * @param bwProvisioner the bw provisioner
* @param storage the storage * @param storage the storage capacity
* @param peList the pe list * @param peList the host's PEs list
* @param vmScheduler the VM scheduler * @param vmScheduler the VM scheduler
*/ */
public PowerHost( public PowerHost(
...@@ -70,10 +70,11 @@ public class PowerHost extends HostDynamicWorkload { ...@@ -70,10 +70,11 @@ public class PowerHost extends HostDynamicWorkload {
} }
/** /**
* Gets the power. For this moment only consumed by all PEs. * Gets the current power consumption of the host. For this moment only consumed by all PEs.
* *
* @param utilization the utilization * @param utilization the utilization percentage (between [0 and 1]) of a resource that
* @return the power * is critical for power consumption
* @return the power consumption
*/ */
protected double getPower(double utilization) { protected double getPower(double utilization) {
double power = 0; double power = 0;
...@@ -105,8 +106,8 @@ public class PowerHost extends HostDynamicWorkload { ...@@ -105,8 +106,8 @@ public class PowerHost extends HostDynamicWorkload {
/** /**
* Gets the energy consumption using linear interpolation of the utilization change. * Gets the energy consumption using linear interpolation of the utilization change.
* *
* @param fromUtilization the from utilization * @param fromUtilization the initial utilization percentage
* @param toUtilization the to utilization * @param toUtilization the final utilization percentage
* @param time the time * @param time the time
* @return the energy * @return the energy
*/ */
......
...@@ -18,7 +18,7 @@ import org.cloudbus.cloudsim.provisioners.RamProvisioner; ...@@ -18,7 +18,7 @@ import org.cloudbus.cloudsim.provisioners.RamProvisioner;
import org.cloudbus.cloudsim.util.MathUtil; import org.cloudbus.cloudsim.util.MathUtil;
/** /**
* The class of a host that stores its CPU utilization history. The history is used by VM allocation * A host that stores its CPU utilization percentage history. The history is used by VM allocation
* and selection policies. * and selection policies.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
...@@ -37,15 +37,15 @@ import org.cloudbus.cloudsim.util.MathUtil; ...@@ -37,15 +37,15 @@ import org.cloudbus.cloudsim.util.MathUtil;
public class PowerHostUtilizationHistory extends PowerHost { public class PowerHostUtilizationHistory extends PowerHost {
/** /**
* Instantiates a new power host utilization history. * Instantiates a new PowerHostUtilizationHistory.
* *
* @param id the id * @param id the host id
* @param ramProvisioner the ram provisioner * @param ramProvisioner the ram provisioner
* @param bwProvisioner the bw provisioner * @param bwProvisioner the bw provisioner
* @param storage the storage * @param storage the storage capacity
* @param peList the pe list * @param peList the host's PEs list
* @param vmScheduler the vm scheduler * @param vmScheduler the vm scheduler
* @param powerModel the power model * @param powerModel the power consumption model
*/ */
public PowerHostUtilizationHistory( public PowerHostUtilizationHistory(
int id, int id,
...@@ -59,9 +59,9 @@ public class PowerHostUtilizationHistory extends PowerHost { ...@@ -59,9 +59,9 @@ public class PowerHostUtilizationHistory extends PowerHost {
} }
/** /**
* Gets the host utilization history. * Gets the host CPU utilization percentage history.
* *
* @return the host utilization history * @return the host CPU utilization percentage history
*/ */
protected double[] getUtilizationHistory() { protected double[] getUtilizationHistory() {
double[] utilizationHistory = new double[PowerVm.HISTORY_LENGTH]; double[] utilizationHistory = new double[PowerVm.HISTORY_LENGTH];
......
...@@ -17,7 +17,7 @@ import org.cloudbus.cloudsim.core.CloudSim; ...@@ -17,7 +17,7 @@ import org.cloudbus.cloudsim.core.CloudSim;
import org.cloudbus.cloudsim.util.MathUtil; import org.cloudbus.cloudsim.util.MathUtil;
/** /**
* The class of a VM that stores its CPU utilization history. The history is used by VM allocation * A class of VM that stores its CPU utilization percentage history. The history is used by VM allocation
* and selection policies. * and selection policies.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
...@@ -38,17 +38,18 @@ public class PowerVm extends Vm { ...@@ -38,17 +38,18 @@ public class PowerVm extends Vm {
/** The Constant HISTORY_LENGTH. */ /** The Constant HISTORY_LENGTH. */
public static final int HISTORY_LENGTH = 30; public static final int HISTORY_LENGTH = 30;
/** The utilization history. */ /** The CPU utilization percentage history. */
private final List<Double> utilizationHistory = new LinkedList<Double>(); private final List<Double> utilizationHistory = new LinkedList<Double>();
/** The previous time. */ /** The previous time that cloudlets were processed. */
private double previousTime; private double previousTime;
/** The scheduling interval. */ /** The scheduling interval to update the processing of cloudlets
* running in this VM. */
private double schedulingInterval; private double schedulingInterval;
/** /**
* Instantiates a new power vm. * Instantiates a new PowerVm.
* *
* @param id the id * @param id the id
* @param userId the user id * @param userId the user id
...@@ -78,18 +79,6 @@ public class PowerVm extends Vm { ...@@ -78,18 +79,6 @@ public class PowerVm extends Vm {
setSchedulingInterval(schedulingInterval); setSchedulingInterval(schedulingInterval);
} }
/**
* Updates the processing of cloudlets running on this VM.
*
* @param currentTime current simulation time
* @param mipsShare array with MIPS share of each Pe available to the scheduler
*
* @return time predicted completion time of the earliest finishing cloudlet, or 0 if there is
* no next events
*
* @pre currentTime >= 0
* @post $none
*/
@Override @Override
public double updateVmProcessing(final double currentTime, final List<Double> mipsShare) { public double updateVmProcessing(final double currentTime, final List<Double> mipsShare) {
double time = super.updateVmProcessing(currentTime, mipsShare); double time = super.updateVmProcessing(currentTime, mipsShare);
...@@ -106,7 +95,7 @@ public class PowerVm extends Vm { ...@@ -106,7 +95,7 @@ public class PowerVm extends Vm {
/** /**
* Gets the utilization MAD in MIPS. * Gets the utilization MAD in MIPS.
* *
* @return the utilization mean in MIPS * @return the utilization MAD in MIPS
*/ */
public double getUtilizationMad() { public double getUtilizationMad() {
double mad = 0; double mad = 0;
...@@ -168,9 +157,9 @@ public class PowerVm extends Vm { ...@@ -168,9 +157,9 @@ public class PowerVm extends Vm {
} }
/** /**
* Adds the utilization history value. * Adds a CPU utilization percentage history value.
* *
* @param utilization the utilization * @param utilization the CPU utilization percentage to add
*/ */
public void addUtilizationHistoryValue(final double utilization) { public void addUtilizationHistoryValue(final double utilization) {
getUtilizationHistory().add(0, utilization); getUtilizationHistory().add(0, utilization);
...@@ -180,9 +169,9 @@ public class PowerVm extends Vm { ...@@ -180,9 +169,9 @@ public class PowerVm extends Vm {
} }
/** /**
* Gets the utilization history. * Gets the CPU utilization percentage history.
* *
* @return the utilization history * @return the CPU utilization percentage history
*/ */
protected List<Double> getUtilizationHistory() { protected List<Double> getUtilizationHistory() {
return utilizationHistory; return utilizationHistory;
......
...@@ -19,7 +19,7 @@ import org.cloudbus.cloudsim.VmAllocationPolicy; ...@@ -19,7 +19,7 @@ import org.cloudbus.cloudsim.VmAllocationPolicy;
import org.cloudbus.cloudsim.core.CloudSim; import org.cloudbus.cloudsim.core.CloudSim;
/** /**
* The class of an abstract power-aware VM allocation policy. * An abstract power-aware VM allocation policy.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
...@@ -36,11 +36,12 @@ import org.cloudbus.cloudsim.core.CloudSim; ...@@ -36,11 +36,12 @@ import org.cloudbus.cloudsim.core.CloudSim;
*/ */
public abstract class PowerVmAllocationPolicyAbstract extends VmAllocationPolicy { public abstract class PowerVmAllocationPolicyAbstract extends VmAllocationPolicy {
/** The vm table. */ /** The map map where each key is a VM id and
* each value is the host where the VM is placed. */
private final Map<String, Host> vmTable = new HashMap<String, Host>(); private final Map<String, Host> vmTable = new HashMap<String, Host>();
/** /**
* Instantiates a new power vm allocation policy abstract. * Instantiates a new PowerVmAllocationPolicyAbstract.
* *
* @param list the list * @param list the list
*/ */
...@@ -73,10 +74,10 @@ public abstract class PowerVmAllocationPolicyAbstract extends VmAllocationPolicy ...@@ -73,10 +74,10 @@ public abstract class PowerVmAllocationPolicyAbstract extends VmAllocationPolicy
} }
/** /**
* Find host for vm. * Finds the first host that has enough resources to host a given VM.
* *
* @param vm the vm * @param vm the vm to find a host for it
* @return the power host * @return the first host found that can host the VM
*/ */
public PowerHost findHostForVm(Vm vm) { public PowerHost findHostForVm(Vm vm) {
for (PowerHost host : this.<PowerHost> getHostList()) { for (PowerHost host : this.<PowerHost> getHostList()) {
......
...@@ -16,7 +16,8 @@ import org.cloudbus.cloudsim.Vm; ...@@ -16,7 +16,8 @@ import org.cloudbus.cloudsim.Vm;
import org.cloudbus.cloudsim.util.MathUtil; import org.cloudbus.cloudsim.util.MathUtil;
/** /**
* The Inter Quartile Range (IQR) VM allocation policy. * A VM allocation policy that uses Inter Quartile Range (IQR) to compute
* a dynamic threshold in order to detect host over utilization.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
...@@ -34,14 +35,29 @@ import org.cloudbus.cloudsim.util.MathUtil; ...@@ -34,14 +35,29 @@ import org.cloudbus.cloudsim.util.MathUtil;
public class PowerVmAllocationPolicyMigrationInterQuartileRange extends public class PowerVmAllocationPolicyMigrationInterQuartileRange extends
PowerVmAllocationPolicyMigrationAbstract { PowerVmAllocationPolicyMigrationAbstract {
/** The safety parameter. */ /** The safety parameter in percentage (at scale from 0 to 1).
* It is a tuning parameter used by the allocation policy to
* estimate host utilization (load). The host overload detection is based
* on this estimation.
* This parameter is used to tune the estimation
* to up or down. If the parameter is set as 1.2, for instance,
* the estimated host utilization is increased in 20%, giving
* the host a safety margin of 20% to grow its usage in order to try
* avoiding SLA violations. As this parameter decreases, more
* aggressive will be the consolidation (packing) of VMs inside a host,
* what may lead to optimization of resource usage, but rising of SLA
* violations. Thus, the parameter has to be set in order to balance
* such factors.
*/
private double safetyParameter = 0; private double safetyParameter = 0;
/** The fallback vm allocation policy. */ /** The fallback VM allocation policy to be used when
* the IQR over utilization host detection doesn't have
* data to be computed. */
private PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy; private PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy;
/** /**
* Instantiates a new power vm allocation policy migration mad. * Instantiates a new PowerVmAllocationPolicyMigrationInterQuartileRange.
* *
* @param hostList the host list * @param hostList the host list
* @param vmSelectionPolicy the vm selection policy * @param vmSelectionPolicy the vm selection policy
...@@ -60,7 +76,7 @@ public class PowerVmAllocationPolicyMigrationInterQuartileRange extends ...@@ -60,7 +76,7 @@ public class PowerVmAllocationPolicyMigrationInterQuartileRange extends
} }
/** /**
* Instantiates a new power vm allocation policy migration mad. * Instantiates a new PowerVmAllocationPolicyMigrationInterQuartileRange.
* *
* @param hostList the host list * @param hostList the host list
* @param vmSelectionPolicy the vm selection policy * @param vmSelectionPolicy the vm selection policy
...@@ -77,10 +93,10 @@ public class PowerVmAllocationPolicyMigrationInterQuartileRange extends ...@@ -77,10 +93,10 @@ public class PowerVmAllocationPolicyMigrationInterQuartileRange extends
} }
/** /**
* Checks if is host over utilized. * Checks if the host is over utilized, based on CPU utilization.
* *
* @param _host the _host * @param host the host
* @return true, if is host over utilized * @return true, if the host is over utilized; false otherwise
*/ */
@Override @Override
protected boolean isHostOverUtilized(PowerHost host) { protected boolean isHostOverUtilized(PowerHost host) {
...@@ -101,10 +117,10 @@ public class PowerVmAllocationPolicyMigrationInterQuartileRange extends ...@@ -101,10 +117,10 @@ public class PowerVmAllocationPolicyMigrationInterQuartileRange extends
} }
/** /**
* Gets the host utilization iqr. * Gets the host CPU utilization percentage IQR.
* *
* @param host the host * @param host the host
* @return the host utilization iqr * @return the host CPU utilization percentage IQR
*/ */
protected double getHostUtilizationIqr(PowerHostUtilizationHistory host) throws IllegalArgumentException { protected double getHostUtilizationIqr(PowerHostUtilizationHistory host) throws IllegalArgumentException {
double[] data = host.getUtilizationHistory(); double[] data = host.getUtilizationHistory();
......
...@@ -15,7 +15,8 @@ import org.cloudbus.cloudsim.Vm; ...@@ -15,7 +15,8 @@ import org.cloudbus.cloudsim.Vm;
import org.cloudbus.cloudsim.util.MathUtil; import org.cloudbus.cloudsim.util.MathUtil;
/** /**
* The Local Regression (LR) VM allocation policy. * A VM allocation policy that uses Local Regression (LR) to predict host utilization (load)
* and define if a host is overloaded or not.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
...@@ -32,17 +33,32 @@ import org.cloudbus.cloudsim.util.MathUtil; ...@@ -32,17 +33,32 @@ import org.cloudbus.cloudsim.util.MathUtil;
*/ */
public class PowerVmAllocationPolicyMigrationLocalRegression extends PowerVmAllocationPolicyMigrationAbstract { public class PowerVmAllocationPolicyMigrationLocalRegression extends PowerVmAllocationPolicyMigrationAbstract {
/** The scheduling interval. */ /** The scheduling interval that defines the periodicity of VM migrations. */
private double schedulingInterval; private double schedulingInterval;
/** The safety parameter. */ /** The safety parameter in percentage (at scale from 0 to 1).
* It is a tuning parameter used by the allocation policy to
* estimate host utilization (load). The host overload detection is based
* on this estimation.
* This parameter is used to tune the estimation
* to up or down. If the parameter is set as 1.2, for instance,
* the estimated host utilization is increased in 20%, giving
* the host a safety margin of 20% to grow its usage in order to try
* avoiding SLA violations. As this parameter decreases, more
* aggressive will be the consolidation (packing) of VMs inside a host,
* what may lead to optimization of resource usage, but rising of SLA
* violations. Thus, the parameter has to be set in order to balance
* such factors.
*/
private double safetyParameter; private double safetyParameter;
/** The fallback vm allocation policy. */ /** The fallback VM allocation policy to be used when
* the Local REgression over utilization host detection doesn't have
* data to be computed. */
private PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy; private PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy;
/** /**
* Instantiates a new power vm allocation policy migration local regression. * Instantiates a new PowerVmAllocationPolicyMigrationLocalRegression.
* *
* @param hostList the host list * @param hostList the host list
* @param vmSelectionPolicy the vm selection policy * @param vmSelectionPolicy the vm selection policy
...@@ -64,7 +80,7 @@ public class PowerVmAllocationPolicyMigrationLocalRegression extends PowerVmAllo ...@@ -64,7 +80,7 @@ public class PowerVmAllocationPolicyMigrationLocalRegression extends PowerVmAllo
} }
/** /**
* Instantiates a new power vm allocation policy migration local regression. * Instantiates a new PowerVmAllocationPolicyMigrationLocalRegression.
* *
* @param hostList the host list * @param hostList the host list
* @param vmSelectionPolicy the vm selection policy * @param vmSelectionPolicy the vm selection policy
...@@ -84,10 +100,10 @@ public class PowerVmAllocationPolicyMigrationLocalRegression extends PowerVmAllo ...@@ -84,10 +100,10 @@ public class PowerVmAllocationPolicyMigrationLocalRegression extends PowerVmAllo
} }
/** /**
* Checks if is host over utilized. * Checks if a host is over utilized.
* *
* @param host the host * @param host the host
* @return true, if is host over utilized * @return true, if is host over utilized; false otherwise
*/ */
@Override @Override
protected boolean isHostOverUtilized(PowerHost host) { protected boolean isHostOverUtilized(PowerHost host) {
...@@ -117,10 +133,10 @@ public class PowerVmAllocationPolicyMigrationLocalRegression extends PowerVmAllo ...@@ -117,10 +133,10 @@ public class PowerVmAllocationPolicyMigrationLocalRegression extends PowerVmAllo
} }
/** /**
* Gets the parameter estimates. * Gets utilization estimates.
* *
* @param utilizationHistoryReversed the utilization history reversed * @param utilizationHistoryReversed the utilization history in reverse order
* @return the parameter estimates * @return the utilization estimates
*/ */
protected double[] getParameterEstimates(double[] utilizationHistoryReversed) { protected double[] getParameterEstimates(double[] utilizationHistoryReversed) {
return MathUtil.getLoessParameterEstimates(utilizationHistoryReversed); return MathUtil.getLoessParameterEstimates(utilizationHistoryReversed);
......
...@@ -14,7 +14,8 @@ import org.cloudbus.cloudsim.Host; ...@@ -14,7 +14,8 @@ import org.cloudbus.cloudsim.Host;
import org.cloudbus.cloudsim.util.MathUtil; import org.cloudbus.cloudsim.util.MathUtil;
/** /**
* The Local Regression Robust (LRR) VM allocation policy. * A VM allocation policy that uses Local Regression Robust (LRR) to predict host utilization (load)
* and define if a host is overloaded or not.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
...@@ -33,7 +34,7 @@ public class PowerVmAllocationPolicyMigrationLocalRegressionRobust extends ...@@ -33,7 +34,7 @@ public class PowerVmAllocationPolicyMigrationLocalRegressionRobust extends
PowerVmAllocationPolicyMigrationLocalRegression { PowerVmAllocationPolicyMigrationLocalRegression {
/** /**
* Instantiates a new power vm allocation policy migration local regression. * Instantiates a new PowerVmAllocationPolicyMigrationLocalRegressionRobust.
* *
* @param hostList the host list * @param hostList the host list
* @param vmSelectionPolicy the vm selection policy * @param vmSelectionPolicy the vm selection policy
...@@ -58,7 +59,7 @@ public class PowerVmAllocationPolicyMigrationLocalRegressionRobust extends ...@@ -58,7 +59,7 @@ public class PowerVmAllocationPolicyMigrationLocalRegressionRobust extends
} }
/** /**
* Instantiates a new power vm allocation policy migration local regression. * Instantiates a new PowerVmAllocationPolicyMigrationLocalRegressionRobust.
* *
* @param hostList the host list * @param hostList the host list
* @param vmSelectionPolicy the vm selection policy * @param vmSelectionPolicy the vm selection policy
...@@ -75,10 +76,10 @@ public class PowerVmAllocationPolicyMigrationLocalRegressionRobust extends ...@@ -75,10 +76,10 @@ public class PowerVmAllocationPolicyMigrationLocalRegressionRobust extends
} }
/** /**
* Gets the parameter estimates. * Gets the utilization estimates.
* *
* @param utilizationHistoryReversed the utilization history reversed * @param utilizationHistoryReversed the utilization history reversed
* @return the parameter estimates * @return the utilization estimates
*/ */
@Override @Override
protected double[] getParameterEstimates(double[] utilizationHistoryReversed) { protected double[] getParameterEstimates(double[] utilizationHistoryReversed) {
......
...@@ -16,7 +16,8 @@ import org.cloudbus.cloudsim.Vm; ...@@ -16,7 +16,8 @@ import org.cloudbus.cloudsim.Vm;
import org.cloudbus.cloudsim.util.MathUtil; import org.cloudbus.cloudsim.util.MathUtil;
/** /**
* The Median Absolute Deviation (MAD) VM allocation policy. * A VM allocation policy that uses Median Absolute Deviation (MAD) to compute
* a dynamic threshold in order to detect host over utilization.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
...@@ -57,15 +58,16 @@ public class PowerVmAllocationPolicyMigrationMedianAbsoluteDeviation extends ...@@ -57,15 +58,16 @@ public class PowerVmAllocationPolicyMigrationMedianAbsoluteDeviation extends
* utilization threshold that may lead to lower SLA violations but higher * utilization threshold that may lead to lower SLA violations but higher
* resource wastage. Thus this parameter has to be tuned in order to * resource wastage. Thus this parameter has to be tuned in order to
* trade-off between SLA violation and resource wastage. * trade-off between SLA violation and resource wastage.
*/ */
private double safetyParameter = 0; private double safetyParameter = 0;
/** The fallback vm allocation policy. */ /** The fallback VM allocation policy to be used when
* the MAD over utilization host detection doesn't have
* data to be computed. */
private PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy; private PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy;
/** /**
* Instantiates a new power vm allocation policy migration mad. * Instantiates a new PowerVmAllocationPolicyMigrationMedianAbsoluteDeviation.
* *
* @param hostList the host list * @param hostList the host list
* @param vmSelectionPolicy the vm selection policy * @param vmSelectionPolicy the vm selection policy
...@@ -84,7 +86,7 @@ public class PowerVmAllocationPolicyMigrationMedianAbsoluteDeviation extends ...@@ -84,7 +86,7 @@ public class PowerVmAllocationPolicyMigrationMedianAbsoluteDeviation extends
} }
/** /**
* Instantiates a new power vm allocation policy migration mad. * Instantiates a new PowerVmAllocationPolicyMigrationMedianAbsoluteDeviation.
* *
* @param hostList the host list * @param hostList the host list
* @param vmSelectionPolicy the vm selection policy * @param vmSelectionPolicy the vm selection policy
...@@ -101,10 +103,10 @@ public class PowerVmAllocationPolicyMigrationMedianAbsoluteDeviation extends ...@@ -101,10 +103,10 @@ public class PowerVmAllocationPolicyMigrationMedianAbsoluteDeviation extends
} }
/** /**
* Checks if is host over utilized. * Checks if a host is over utilized.
* *
* @param _host the _host * @param host the host
* @return true, if is host over utilized * @return true, if the host is over utilized; false otherwise
*/ */
@Override @Override
protected boolean isHostOverUtilized(PowerHost host) { protected boolean isHostOverUtilized(PowerHost host) {
...@@ -125,10 +127,10 @@ public class PowerVmAllocationPolicyMigrationMedianAbsoluteDeviation extends ...@@ -125,10 +127,10 @@ public class PowerVmAllocationPolicyMigrationMedianAbsoluteDeviation extends
} }
/** /**
* Gets the host utilization mad. * Gets the host utilization MAD.
* *
* @param host the host * @param host the host
* @return the host utilization mad * @return the host utilization MAD
*/ */
protected double getHostUtilizationMad(PowerHostUtilizationHistory host) throws IllegalArgumentException { protected double getHostUtilizationMad(PowerHostUtilizationHistory host) throws IllegalArgumentException {
double[] data = host.getUtilizationHistory(); double[] data = host.getUtilizationHistory();
......
...@@ -14,7 +14,8 @@ import org.cloudbus.cloudsim.Host; ...@@ -14,7 +14,8 @@ import org.cloudbus.cloudsim.Host;
import org.cloudbus.cloudsim.Vm; import org.cloudbus.cloudsim.Vm;
/** /**
* The Static Threshold (THR) VM allocation policy. * A VM allocation policy that uses a Static CPU utilization Threshold (THR) to detect host over
* utilization.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
...@@ -31,11 +32,13 @@ import org.cloudbus.cloudsim.Vm; ...@@ -31,11 +32,13 @@ import org.cloudbus.cloudsim.Vm;
*/ */
public class PowerVmAllocationPolicyMigrationStaticThreshold extends PowerVmAllocationPolicyMigrationAbstract { public class PowerVmAllocationPolicyMigrationStaticThreshold extends PowerVmAllocationPolicyMigrationAbstract {
/** The utilization threshold. */ /** The static host CPU utilization threshold to detect over utilization.
* It is a percentage value from 0 to 1
* that can be changed when creating an instance of the class. */
private double utilizationThreshold = 0.9; private double utilizationThreshold = 0.9;
/** /**
* Instantiates a new power vm allocation policy migration mad. * Instantiates a new PowerVmAllocationPolicyMigrationStaticThreshold.
* *
* @param hostList the host list * @param hostList the host list
* @param vmSelectionPolicy the vm selection policy * @param vmSelectionPolicy the vm selection policy
...@@ -50,10 +53,10 @@ public class PowerVmAllocationPolicyMigrationStaticThreshold extends PowerVmAllo ...@@ -50,10 +53,10 @@ public class PowerVmAllocationPolicyMigrationStaticThreshold extends PowerVmAllo
} }
/** /**
* Checks if is host over utilized. * Checks if a host is over utilized, based on CPU usage.
* *
* @param _host the _host * @param host the host
* @return true, if is host over utilized * @return true, if the host is over utilized; false otherwise
*/ */
@Override @Override
protected boolean isHostOverUtilized(PowerHost host) { protected boolean isHostOverUtilized(PowerHost host) {
......
...@@ -15,7 +15,7 @@ import org.cloudbus.cloudsim.Host; ...@@ -15,7 +15,7 @@ import org.cloudbus.cloudsim.Host;
import org.cloudbus.cloudsim.Vm; import org.cloudbus.cloudsim.Vm;
/** /**
* This a simple class representing a simple VM allocation policy that does not perform any * A class representing a simple VM allocation policy that does not perform any
* optimization of the VM allocation. * optimization of the VM allocation.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
...@@ -34,7 +34,7 @@ import org.cloudbus.cloudsim.Vm; ...@@ -34,7 +34,7 @@ import org.cloudbus.cloudsim.Vm;
public class PowerVmAllocationPolicySimple extends PowerVmAllocationPolicyAbstract { public class PowerVmAllocationPolicySimple extends PowerVmAllocationPolicyAbstract {
/** /**
* Instantiates a new power vm allocation policy simple. * Instantiates a new PowerVmAllocationPolicySimple.
* *
* @param list the list * @param list the list
*/ */
...@@ -42,8 +42,15 @@ public class PowerVmAllocationPolicySimple extends PowerVmAllocationPolicyAbstra ...@@ -42,8 +42,15 @@ public class PowerVmAllocationPolicySimple extends PowerVmAllocationPolicyAbstra
super(list); super(list);
} }
/**
* The method doesn't perform any VM allocation optimization
* and in fact has no effect.
* @param vmList
* @return
*/
@Override @Override
public List<Map<String, Object>> optimizeAllocation(List<? extends Vm> vmList) { public List<Map<String, Object>> optimizeAllocation(List<? extends Vm> vmList) {
//@todo It is better to return an empty map in order to avoid NullPointerException or extra null checks
// This policy does not optimize the VM allocation // This policy does not optimize the VM allocation
return null; return null;
} }
......
...@@ -14,7 +14,8 @@ import java.util.List; ...@@ -14,7 +14,8 @@ import java.util.List;
import org.cloudbus.cloudsim.Vm; import org.cloudbus.cloudsim.Vm;
/** /**
* The class of an abstract VM selection policy. * An abstract VM selection policy used to select VMs from a list of migratable VMs.
* The selection is defined by sub classes.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
...@@ -32,18 +33,18 @@ import org.cloudbus.cloudsim.Vm; ...@@ -32,18 +33,18 @@ import org.cloudbus.cloudsim.Vm;
public abstract class PowerVmSelectionPolicy { public abstract class PowerVmSelectionPolicy {
/** /**
* Gets the vms to migrate. * Gets a VM to migrate from a given host.
* *
* @param host the host * @param host the host
* @return the vms to migrate * @return the vm to migrate
*/ */
public abstract Vm getVmToMigrate(PowerHost host); public abstract Vm getVmToMigrate(PowerHost host);
/** /**
* Gets the migratable vms. * Gets the list of migratable VMs from a given host.
* *
* @param host the host * @param host the host
* @return the migratable vms * @return the list of migratable VMs
*/ */
protected List<PowerVm> getMigratableVms(PowerHost host) { protected List<PowerVm> getMigratableVms(PowerHost host) {
List<PowerVm> migratableVms = new ArrayList<PowerVm>(); List<PowerVm> migratableVms = new ArrayList<PowerVm>();
......
...@@ -16,7 +16,8 @@ import org.cloudbus.cloudsim.Vm; ...@@ -16,7 +16,8 @@ import org.cloudbus.cloudsim.Vm;
import org.cloudbus.cloudsim.util.MathUtil; import org.cloudbus.cloudsim.util.MathUtil;
/** /**
* The Maximum Correlation (MC) VM selection policy. * A VM selection policy that selects for migration the VM with the Maximum Correlation Coefficient (MCC) among
* a list of migratable VMs.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
...@@ -33,11 +34,12 @@ import org.cloudbus.cloudsim.util.MathUtil; ...@@ -33,11 +34,12 @@ import org.cloudbus.cloudsim.util.MathUtil;
*/ */
public class PowerVmSelectionPolicyMaximumCorrelation extends PowerVmSelectionPolicy { public class PowerVmSelectionPolicyMaximumCorrelation extends PowerVmSelectionPolicy {
/** The fallback policy. */ /** The fallback VM selection policy to be used when
* the Maximum Correlation policy doesn't have data to be computed. */
private PowerVmSelectionPolicy fallbackPolicy; private PowerVmSelectionPolicy fallbackPolicy;
/** /**
* Instantiates a new power vm selection policy maximum correlation. * Instantiates a new PowerVmSelectionPolicyMaximumCorrelation.
* *
* @param fallbackPolicy the fallback policy * @param fallbackPolicy the fallback policy
*/ */
...@@ -71,13 +73,20 @@ public class PowerVmSelectionPolicyMaximumCorrelation extends PowerVmSelectionPo ...@@ -71,13 +73,20 @@ public class PowerVmSelectionPolicyMaximumCorrelation extends PowerVmSelectionPo
} }
/** /**
* Gets the utilization matrix. * Gets the CPU utilization percentage matrix for a given list of VMs.
* *
* @param vmList the host * @param vmList the VM list
* @return the utilization matrix * @return the CPU utilization percentage matrix, where each line i
* is a VM and each column j is a CPU utilization percentage history for that VM.
*/ */
protected double[][] getUtilizationMatrix(final List<PowerVm> vmList) { protected double[][] getUtilizationMatrix(final List<PowerVm> vmList) {
int n = vmList.size(); int n = vmList.size();
/*@todo It gets the min size of the history among all VMs considering
that different VMs can have different history sizes.
However, the j loop is not using the m variable
but the size of the vm list. If a VM list has
a size greater than m, it will thow an exception.
It as to be included a test case for that.*/
int m = getMinUtilizationHistorySize(vmList); int m = getMinUtilizationHistorySize(vmList);
double[][] utilization = new double[n][m]; double[][] utilization = new double[n][m];
for (int i = 0; i < n; i++) { for (int i = 0; i < n; i++) {
...@@ -90,10 +99,10 @@ public class PowerVmSelectionPolicyMaximumCorrelation extends PowerVmSelectionPo ...@@ -90,10 +99,10 @@ public class PowerVmSelectionPolicyMaximumCorrelation extends PowerVmSelectionPo
} }
/** /**
* Gets the min utilization history size. * Gets the min CPU utilization percentage history size among a list of VMs.
* *
* @param vmList the vm list * @param vmList the VM list
* @return the min utilization history size * @return the min CPU utilization percentage history size of the VM list
*/ */
protected int getMinUtilizationHistorySize(final List<PowerVm> vmList) { protected int getMinUtilizationHistorySize(final List<PowerVm> vmList) {
int minSize = Integer.MAX_VALUE; int minSize = Integer.MAX_VALUE;
......
...@@ -13,7 +13,7 @@ import java.util.List; ...@@ -13,7 +13,7 @@ import java.util.List;
import org.cloudbus.cloudsim.Vm; import org.cloudbus.cloudsim.Vm;
/** /**
* The Minimum Migration Time (MMT) VM selection policy. * A VM selection policy that selects for migration the VM with Minimum Migration Time (MMT).
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
......
...@@ -14,7 +14,8 @@ import org.cloudbus.cloudsim.Vm; ...@@ -14,7 +14,8 @@ import org.cloudbus.cloudsim.Vm;
import org.cloudbus.cloudsim.core.CloudSim; import org.cloudbus.cloudsim.core.CloudSim;
/** /**
* The Minimum Utilization (MU) VM selection policy. * A VM selection policy that selects for migration the VM with Minimum Utilization (MU)
* of CPU.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
......
...@@ -14,7 +14,7 @@ import java.util.Random; ...@@ -14,7 +14,7 @@ import java.util.Random;
import org.cloudbus.cloudsim.Vm; import org.cloudbus.cloudsim.Vm;
/** /**
* The Random Selection (RS) VM selection policy. * A VM selection policy that randomly select VMs to migrate from a host.
* *
* <br/>If you are using any algorithms, policies or workload included in the power package please cite * <br/>If you are using any algorithms, policies or workload included in the power package please cite
* the following paper:<br/> * the following paper:<br/>
......
...@@ -48,8 +48,8 @@ public class ExecutionTimeMeasurer { ...@@ -48,8 +48,8 @@ public class ExecutionTimeMeasurer {
* Finalizes measuring the execution time of a method/process. * Finalizes measuring the execution time of a method/process.
* *
* @param name the name of the method/process being measured. * @param name the name of the method/process being measured.
* @see #executionTimes
* @return the time the method/process spent in execution (in seconds) * @return the time the method/process spent in execution (in seconds)
* @see #executionTimes
*/ */
public static double end(String name) { public static double end(String name) {
double time = (System.currentTimeMillis() - getExecutionTimes().get(name)) / 1000.0; double time = (System.currentTimeMillis() - getExecutionTimes().get(name)) / 1000.0;
......
...@@ -232,10 +232,10 @@ public class MathUtil { ...@@ -232,10 +232,10 @@ public class MathUtil {
} }
/** /**
* Gets the loess parameter estimates. * Gets the Local Regression (Loess) parameter estimates.
* *
* @param y the y array * @param y the y array
* @return the loess parameter estimates * @return the Loess parameter estimates
*/ */
public static double[] getLoessParameterEstimates(final double[] y) { public static double[] getLoessParameterEstimates(final double[] y) {
int n = y.length; int n = y.length;
...@@ -268,8 +268,6 @@ public class MathUtil { ...@@ -268,8 +268,6 @@ public class MathUtil {
double[] xW = new double[x.length]; double[] xW = new double[x.length];
double[] yW = new double[y.length]; double[] yW = new double[y.length];
// As to Flanagan's documentation they perform weigthed regression if the
// number or non-zero weigths is more than 40%
int numZeroWeigths = 0; int numZeroWeigths = 0;
for (int i = 0; i < weigths.length; i++) { for (int i = 0; i < weigths.length; i++) {
if (weigths[i] <= 0) { if (weigths[i] <= 0) {
......
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