# Feedback Control for Computer Systems

O'Reilly (2013). Janert teaches classical control theory (PID loops, stability, transfer functions) for software engineers running queues, autoscalers, rate limiters, and load balancers. The pitch is that "make a graph and add a threshold" is a control loop without theory; this book is the theory you keep wishing you had when the loop oscillates. On the [[eatonphil-bookclub]] speculative future list.