Explore an architecture for optimizing the number of goroutines using feedback control in this GopherCon 2019 talk. Dive into the importance of dynamic concurrency design for achieving both speed and stability in Go applications. Learn about performance tuning, Go's runtime scheduler, and the complexities of concurrency. Discover how to implement feedback control mechanisms, including PID controllers and dynamic target controllers, to determine the optimal number of goroutines. Examine the concept of elastic semaphores and the architecture of kaburaya. Analyze experimental results from various tasks to understand the effectiveness of this approach in different scenarios. Gain insights into improving Go application performance without relying on specific platform or load conditions.