Observed Signal · Jul 27, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
Unbounded .NET Channel Caused 188 MB Heap Growth
A developer measured the memory and queue-depth cost of using System.Threading.Channels' unbounded channel in .NET 10. In a test with one producer and one consumer handling 100,000 items of 2 KB each, the unbounded channel accumulated a peak queue depth of 90,769 items and raised the managed heap from ~9 MB to 188 MB. Switching to a bounded channel with capacity 1,000 and FullMode.Wait limited peak depth (~1,001) and peak heap (~19 MB) with comparable end-to-end time, while a DropOldest policy shed most work (97,239 dropped) and kept memory flat. The author now defaults to bounded channels and treats an inability to name capacity as a design smell.
Practical engineering demonstration of how unbounded queues convert consumer lag into process memory growth and how bounded queues or drop policies control blast radius—useful for developers and platform engineers but not industry-shifting.
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Key Takeaways & Evidence Grounding
- Test environment: .NET 10, Release build, small Linux container; one producer, one consumer, 100,000 items, each 2 KB payload.
- Using Channel.CreateUnbounded resulted in peak queued items = 90,769 and peak managed heap = 188 MB during the run.
- Using Channel.CreateBounded with capacity 1,000 and FullMode.Wait produced peak depth = 1,001 and peak heap ≈ 19 MB; enqueue time increased but total processing time remained comparable.
- Using bounded channel with FullMode.DropOldest (capacity 1,000) processed 2,761 items and dropped 97,239 items; total run ~0.08s and memory remained flat.
- Author's conclusion: default to bounded channels; backpressure moves waiting from heap into producer await or client-visible latency depending on policy.
Connected Companies & Entities
2 Entities mapped“The experiment ran on .NET 10, Release build, small Linux container....”
“Full runnable sample: https://github.com/ssukhpinder/dev-to-code-samples/tree/main/006-bounded-channel-backpressure...”
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