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Preserving Order in Concurrent Go Apps: Three Approaches Compared
Concurrency breaks ordering by design, but sometimes we need both. Explore three methods to preserve order in concurrent Go applications, from standard ReplyTo channels to sophisticated permission passing, with benchmarks and real-world trade-offs.
Since the Map function creates backpressure (blocking when the pipeline is full), the rate at which we can feed items into the input channel acts as an accurate proxy for overall processing speed. ReplyTo is a strong contender – it adds at most ~500ns of overhead compared to the baseline, but requires one additional allocation per input item, increasing GC pressure. Rill focuses on composability – operations chain together into larger pipelines – while adding comprehensive error handling, context-friendly design, and maintaining over 95% test coverage.
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