What is Julia's garbage collector design and how does it interact with performance-critical code?

Julia uses a generational garbage collector that minimizes overhead for short-lived objects but can still cause latency spikes.

Julia's GC divides objects into generations, assuming most objects die young. Young generation is collected frequently, while old generation is collected less often. However, in numerical workloads, excessive allocations can trigger GC pauses. Performance engineers aim to eliminate allocations entirely in hot loops to avoid unpredictable latency.