How to use task-coalescing in C# to stop doing wasteful work
The post discusses a common inefficiency in multithreaded applications where multiple tasks redundantly compute the same result, particularly in scenarios involving high-concurrency requests to remote servers. It introduces the task-coalescing technique, which ensures that only one task fetches the data while others reuse the result, reducing wasteful work. Using .NET’s
Lazy<T> and ConcurrentDictionary<TKey, TValue>, the example implementation demonstrates how to achieve this efficiently, mitigating issues like cache stampedes and improving performance with minimal code changes.