scheduling

A port is three coupled scheduling problems in a single prompt: where ships dock, which cranes work them, and where containers land in the yard. The strong answer decomposes them, names where they couple, and refuses to solve the whole thing as one giant optimizer.

A reported OpenAI design prompt. The skeleton: gang scheduling, topology-aware placement, preemption with checkpoint contracts, and quota, plus the fragmentation problem that quietly eats 20% of naive clusters.