Steven Giesel 11/3/2025

ArrayPool Benchmarks: We have a problem

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This technical article examines why many C# .NET benchmarks using ArrayPool<T>.Shared are flawed. It explains how the Just-In-Time (JIT) compiler can optimize away unused array allocations, leading to misleading performance measurements. The author provides code examples of incorrect benchmarks, demonstrates the issue with JIT output, and shows how to use tools like BenchmarkDotNet's DeadCodeEliminationHelper to create accurate benchmarks that properly measure memory allocation and performance.

ArrayPool Benchmarks: We have a problem

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