PowerModel

OpenDC uses power models to determine the power draw based on the utilization of a host. All models in OpenDC are based on linear models interpolated between the idle and max power draw. OpenDC currently supports the following power models:

Constant: The power draw is constant and does not depend on the utilization of the host.
Sqrt: The power draw interpolates between idle and max using a square root function.
Linear: The power draw interpolates between idle and max using a linear function.
Square: The power draw interpolates between idle and max using a square function.
CubicThe power draw interpolates between idle and max using a cubic function.
MSE: The power draw interpolates between idle and max using a mean square error function.
Asymptotic: The power draw interpolates between idle and max using an asymptotic function.

The power model is defined using the following parameters:

variable	type	Unit	required?	default	description
modelType	string	N/A	yes	N/A	The type of model used to determine power draw
power	double	Mhz	no	400	The power draw of a host when using the constant power draw model.
idlePower	double	Mhz	yes	N/A	The power draw of a host when idle in Watt.
maxPower	double	Mhz	yes	N/A	The power draw of a host when using max capacity in Watt.
calibrationFactor	double	Mhz	no	N/A	The parameter set to minimize the mean squared error.
asymUtil	double	Mhz	no	N/A	A utilization level at which the host attains asymptotic.
dvfs	Boolean	N/A	no	N/A	A flag indicates whether dynamic voltage and frequency scaling is enabled.

Example

{
    "modelType": "sqrt",
    "idlePower": 32.0,
    "maxPower": 180.0
}

This creates a power model that uses a square root function to determine the power draw of a host. The model uses an idle and max power of 32 W and 180 W respectively.

Example​

Example