Method for saving power in a system by placing inactive computing devices in optimized configuration corresponding to a specific constraint
First Claim
1. A method for managing power consumption in a system including computing devices in both active and one or more inactive states of readiness, the method comprising:
- receiving, at a processing unit, a request to one of;
activate or deactivate one or more computing devices from a respective group of inactive or active computing devices, each said inactive or active computing device initially in a pre-determined state of readiness;
activating or deactivating said one or more computing devices, said activating or deactivating resulting in a number of computing devices in one or more states of readiness i;
computing an optimal configuration of said computing devices in said one or more said states of readiness i by minimizing an expected power consumption Σ
i Ai Pi where i represents all inactive computing device states, Ai represents a number of said computing devices currently in each state i, and, P, represents an average power consumption of computing devices while in said state i; and
,placing said computing devices in said optimized configuration,formulating an objective function to be minimized, said objective function representing said expected power consumption Σ
i Ai Pi subject to a constraint,wherein, after one of said activating or deactivating one or more computing devices;
computing a resulting activation vector A′
representing said resulting number of computing devices in one or more activation states of readiness i; and
computing an activation vector A″
representing a number of computing devices in said optimized one or more activation states of readiness i;
wherein said objective function is subject to a constraint that Rk≦
R0k for each computing devices k, wherein said R represents a readiness vector, a kth component Rk representing a minimal amount of time for k computing devices to be restored to an active state given a specific activation vector A and a transition latency matrix T; and
, R0 represents a specified readiness vector, a kth component R0k representing a specified constraint on a maximum time permitted for k inactive servers to be restored to said active state,wherein a program using said processor unit is configured to perform one or more of said receiving, activating, computing, placing, formulating and said computing said activation vectors A′ and
A″
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Abstract
Managing readiness states of a plurality of computing devices. A programmed processor unit operates, upon receipt of a request, to: provide one or more computing devices from an inactive pool to an active pool, or accept one or more active computing devices into the inactive pool. The system proactively manages the inactive states of each computing device by: determining the desired number (and identities) of computing devices to be placed in each inactive state of readiness by solving a constraint optimization problem that describes a user-specified trade-off between expected readiness (estimated time to be able to activate computing devices when they are needed next) and conserving energy; generating a plan for changing the current set of inactive states to the desired set; and, executing the plan. Multiple alternative ways of quantifying the desired responsiveness to surges in demand are provided.
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Citations
9 Claims
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1. A method for managing power consumption in a system including computing devices in both active and one or more inactive states of readiness, the method comprising:
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receiving, at a processing unit, a request to one of;
activate or deactivate one or more computing devices from a respective group of inactive or active computing devices, each said inactive or active computing device initially in a pre-determined state of readiness;activating or deactivating said one or more computing devices, said activating or deactivating resulting in a number of computing devices in one or more states of readiness i; computing an optimal configuration of said computing devices in said one or more said states of readiness i by minimizing an expected power consumption Σ
i Ai Pi where i represents all inactive computing device states, Ai represents a number of said computing devices currently in each state i, and, P, represents an average power consumption of computing devices while in said state i; and
,placing said computing devices in said optimized configuration, formulating an objective function to be minimized, said objective function representing said expected power consumption Σ
i Ai Pi subject to a constraint,wherein, after one of said activating or deactivating one or more computing devices; computing a resulting activation vector A′
representing said resulting number of computing devices in one or more activation states of readiness i; andcomputing an activation vector A″
representing a number of computing devices in said optimized one or more activation states of readiness i;wherein said objective function is subject to a constraint that Rk≦
R0k for each computing devices k, wherein said R represents a readiness vector, a kth component Rk representing a minimal amount of time for k computing devices to be restored to an active state given a specific activation vector A and a transition latency matrix T; and
, R0 represents a specified readiness vector, a kth component R0k representing a specified constraint on a maximum time permitted for k inactive servers to be restored to said active state,wherein a program using said processor unit is configured to perform one or more of said receiving, activating, computing, placing, formulating and said computing said activation vectors A′ and
A″
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification