C# 10 Performance Issues with Large Collections Using Parallel.ForEach in ASP.NET Core
I'm having trouble with I'm having a hard time understanding I'm not sure how to approach I'm working on a personal project and I'm stuck on something that should probably be simple... I'm experiencing significant performance degradation when processing large collections using `Parallel.ForEach` in my ASP.NET Core 6 application. I have a collection of around 100,000 items that I need to process concurrently. However, the method seems to be taking much longer than expected, and I'm also observing high CPU usage spikes. Here's a simplified version of my code: ```csharp public void ProcessItems(IEnumerable<Item> items) { var options = new ParallelOptions { MaxDegreeOfParallelism = Environment.ProcessorCount }; Parallel.ForEach(items, options, item => { // Simulating some processing work ProcessItem(item); }); } private void ProcessItem(Item item) { Thread.Sleep(50); // Simulating delay } ``` I've tried adjusting the `MaxDegreeOfParallelism`, but it doesn’t seem to make much difference. Additionally, when I ran this in a console application, the performance was acceptable, which makes me suspect that it could be related to the ASP.NET Core environment. I also checked for thread contention, but the locks I have are minimal and shouldn't be causing a bottleneck. Interestingly, when I switched to using `foreach` with asynchronous calls, the processing time improved significantly, but I need to maintain the parallel execution model for performance reasons. Is there a specific aspect of ASP.NET Core's thread handling or resource management that I might be overlooking? Any insights on optimizing `Parallel.ForEach` in this context would be greatly appreciated. I'm developing on Ubuntu 22.04 with C#. What would be the recommended way to handle this? I'm working with C# in a Docker container on Windows 11. My team is using C# for this microservice. I've been using C# for about a year now. I appreciate any insights!