Preserving Order in Concurrent Go Apps: Three Approaches Compared

Sometimes we need concurrent processing that preserves input order while streaming. The standard worker pool pattern shuffles the results. We want ordering with bounded memory, backpressure, and minimal allocations. I implemented and benchmarked three approaches – ReplyTo channels, sync.Cond turn-taking, and a permission-passing chain – the winner adds at most 500ns overhead, and sometimes even…