): The target value (e.g., a 95% cache hit rate or 200ms latency). Controller (
The controller is the most common algorithm used to close the feedback loop. Feedback Control for Computer Systems [Book] - O'Reilly Feedback Control for Computer Systems
The primary objective of a feedback loop is to minimize the —the difference between a desired state ( Setpoint ) and the actual state ( Measured Output ). Setpoint ( ): The target value (e
): The algorithm that calculates what change to apply based on the error. Control Input ( ): The target value (e.g.