Package org.cloudbus.cloudsim.power.models

Interface PowerModel

All Superinterfaces:

PowerAware

All Known Implementing Classes:

PowerModelAbstract, PowerModelCubic, PowerModelLinear, PowerModelSimple, PowerModelSpecPower, PowerModelSpecPowerHpProLiantMl110G3PentiumD930, PowerModelSpecPowerHpProLiantMl110G4Xeon3040, PowerModelSpecPowerHpProLiantMl110G5Xeon3075, PowerModelSpecPowerIbmX3250XeonX3470, PowerModelSpecPowerIbmX3250XeonX3480, PowerModelSpecPowerIbmX3550XeonX5670, PowerModelSpecPowerIbmX3550XeonX5675, PowerModelSqrt, PowerModelSquare

public interface PowerModel
extends PowerAware

Provides a model for power consumption of hosts, depending on utilization of a critical system component, such as CPU. This is the fundamental class to enable power-aware Hosts. However, a Host just provides power usage data if a PowerModel is set using the Host.setPowerModel(PowerModel). The power consumption data is return in Watt-Second (Ws), which is just in a different scale than the usual Kilowatt-Hour (kWh).

The interface implements the Null Object Design Pattern in order to start avoiding NullPointerException when using the NULL object instead of attributing null to PowerModel variables.

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 and Sons, Ltd, New York, USA, 2012

Since:

CloudSim Toolkit 2.0

Author:

Anton Beloglazov, Manoel Campos da Silva Filho

Field Summary

Fields

Modifier and Type	Field	Description
static PowerModel	NULL	A property that implements the Null Object Design Pattern for Host objects.

Method Summary

Modifier and Type	Method	Description
double	getEnergyLinearInterpolation(double fromUtilization, double toUtilization, double time)	Gets an estimation of energy consumption using linear interpolation of the utilization change.
Host	getHost()
double	getMaxPower()	Gets the max power that can be consumed by the host in Watt-Second (Ws).
double	getPower(double utilization)	Gets power consumption in Watt-Second (Ws) of the Power Model, according to the utilization percentage of a critical resource, such as CPU.
void	setHost(Host host)

Methods inherited from interface org.cloudbus.cloudsim.power.models.PowerAware

getPower, getPowerInKWattsHour

Field Detail

NULL

static final PowerModel NULL

A property that implements the Null Object Design Pattern for Host objects.

Method Detail

getHost

Host getHost()

setHost

void setHost(Host host)

getMaxPower

double getMaxPower()

Gets the max power that can be consumed by the host in Watt-Second (Ws).

Returns:

the max consumption power in Watt-Second (Ws)

getPower

double getPower(double utilization)
         throws java.lang.IllegalArgumentException

Gets power consumption in Watt-Second (Ws) of the Power Model, according to the utilization percentage of a critical resource, such as CPU.

The power consumption data is just available while the host is active.

Parameters:

utilization - the utilization percentage (between [0 and 1]) of a resource that is critical for power consumption.

Returns:

the power consumption in Watt-Second (Ws)

Throws:

java.lang.IllegalArgumentException - when the utilization percentage is not between [0 and 1]

getEnergyLinearInterpolation

double getEnergyLinearInterpolation(double fromUtilization,
                                    double toUtilization,
                                    double time)

Gets an estimation of energy consumption using linear interpolation of the utilization change. It's required to set a PowerModel in order to get power usage data.

Parameters:

fromUtilization - the initial utilization percentage

toUtilization - the final utilization percentage

time - the time span between the initial and final utilization to compute the energy consumption

Returns:

the estimated energy consumption