System and method for determining correct sign of response of an adaptive controller

• US 20060287737A1
• Filed: 06/10/2005
• Published: 12/21/2006
• Est. Priority Date: 06/10/2005
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Karlsson, Magnus, Covell, Michele M.
• Granted Patent: US 8,612,028 B2
• Time in Patent Office: Days
• US Class Current: 700/28
• CPC Class Codes: G05B 13/042 in which a parameter or coefficient is automatically adjusted to optimise the performance

Abstract

According to one embodiment, a method comprises receiving, by an adaptive controller, performance measurement for a computing system. The method further comprises estimating a performance model for use by the adaptive controller, and determining whether the estimated performance model has a correct sign for approaching performance desired for the computing system. When determined that the estimated performance model has an incorrect sign, the adaptive controller takes action to determine a performance model having a correct sign for approaching performance desired for the computing system.

Claims

1. A method comprising:

receiving, by an adaptive controller, performance measurement for a computing system;

estimating a performance model for use by said adaptive controller;

determining whether the estimated performance model has a correct sign for approaching performance desired for said computing system;

when determined that the estimated performance model has an incorrect sign, said adaptive controller taking action to determine a performance model having a correct sign for approaching performance desired for said computing system.

2. The method of claim 1 wherein said taking action comprises:

using a previously determined performance model known to have said correct sign instead of said estimated performance model.

3. The method of claim 1 wherein said taking action comprises:

modifying the estimated performance model to result in a performance model having a correct sign for approaching performance desired for said computing system.

5. The method of claim 1 wherein said taking action comprises:

selecting a best model from a plurality of different performance models that are estimated based on the received performance measurement.

6. The method of claim 5 wherein said selecting a best model from said plurality of different performance models comprises:

selecting one of said plurality of different performance models having a correct sign for approaching performance desired for said computing system.

7. The method of claim 1 wherein said estimating said performance model comprises:

estimating said performance model based at least in part on said received performance measurement.

8. The method of claim 1 further comprising:

using said determined performance model having said correct sign for determining a responsive action for said adaptive controller to take in response to said received performance measurement.

9. The method of claim 8 further comprising:

providing said determined performance model having said correct sign to a control law, wherein said control law determines, based on said performance model, an adjustment to an actuator of said computing system for managing performance of said computing system.

10. The method of claim 1 further comprising:

maintaining, by said adaptive controller, a correct sign for an estimated performance model that said adaptive controller uses for determining a responsive action to take for managing performance of said computing system, even when an external event that is not accounted for in the estimated performance model impacts said performance measurement received for said computing system.

11. A method comprising:

receiving, by an adaptive controller, performance measurement for a computing system;

estimating, based at least in part on said received performance measurement, a plurality of different performance models;

identifying at least one of said estimated performance models having a correct sign for approaching performance desired for said computing system; and

using one of said at least one identified performance models for determining a responsive action for said adaptive controller to take in response to said received performance measurement.

12. The method of claim 11 wherein said using comprises:

providing said one of said at least one identified performance models having said correct sign to a control law, wherein said control law determines, based on said performance model, an adjustment to an actuator of said computing system for managing performance of said computing system.

13. The method of claim 11 further comprising:

maintaining, by said adaptive controller, a correct sign for an estimated performance model that is used for determining said responsive action, even when an external event that is not accounted for in the estimated performance model impacts said performance measurement received for said computing system.

14. The method of claim 11 wherein said adaptive controller comprises a self-tuning regulator.

15. A system comprising:

a computing system; and

an adaptive controller operable to monitor performance of said computing system and take responsive action to manage performance of said computing system, wherein said adaptive controller comprises

a) a model estimator for estimating at least one performance model based at least in part on said monitored performance;

b) a control law for setting an actuator, based on an estimated performance model, in attempt to achieve desired performance for said computing system; and

c) logic for controlling a sign of said estimated performance model used by said control law for setting said actuator, wherein said logic for controlling maintains a correct sign for said estimated performance model for approaching performance desired for said computing system even when said monitored performance is impacted by an external event that is not accounted for in said estimated performance model.

16. The system of claim 15 wherein said computing system is a black-box computing system.

17. The system of claim 15 wherein said adaptive controller comprises a self-tuning regulator.

18. The system of claim 15 wherein said logic for controlling comprises:

logic for providing to said control law for use in setting said actuator a previously determined performance model that is known to have said correct sign instead of said at least one estimated performance model.

19. The system of claim 15 wherein said logic for controlling comprises:

logic for modifying an estimated performance model to result in a performance model having a correct sign for approaching performance desired for said computing system.

20. The system of claim 15 wherein said model estimator estimates a plurality of different performance models based at least in part on said monitored performance, and wherein said logic for controlling comprises:

logic for selecting a best model from said plurality of different performance models.

21. The system of claim 20 wherein said logic for selecting a best model from said plurality of different performance models comprises:

logic for selecting one of said plurality of different performance models having a correct sign for approaching performance desired for said computing system.

22. An adaptive controller comprising:

a model estimator for estimating at least one performance model based at least in part on a performance measurement received for a computing system;

a control law for setting an actuator of said computing system, based on an estimated performance model, for managing performance of said computing system; and

logic for controlling a sign of said estimated performance model used by said control law for setting said actuator to maintain said sign correct for approaching performance desired for said computing system even when said performance measurement is impacted by an external event that is not accounted for in said estimated performance model.

23. The adaptive controller of claim 22 wherein said logic for controlling a sign of said estimated performance model comprises:

logic for providing to said control law for use in setting said actuator a previously estimated performance model that is known to have said correct sign instead of said at least one estimated performance model.

24. The adaptive controller of claim 22 wherein said logic for controlling a sign of said estimated performance model comprises:

logic for modifying said at least one estimated performance model to result in a performance model having a correct sign for approaching performance desired for said computing system.

25. The adaptive controller of claim 22 wherein said model estimator estimates a plurality of different performance models based at least in part on said received performance measurement, and wherein said logic for controlling a sign of said estimated performance model comprises:

logic for selecting a best model from said plurality of different performance models.

26. The adaptive controller of claim 25 wherein said logic for selecting a best model from said plurality of different performance models comprises:

logic for selecting one of said plurality of different performance models having a correct sign for approaching performance desired for said computing system.