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Asked: 2026-05-22T01:42:24+00:00

I’ve got some trouble with .NET’s ThreadPool (.NET 4). I’ve read that by default

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I’ve got some trouble with .NET’s ThreadPool (.NET 4).

I’ve read that by default .NET has a limit of 25 threads per processor, but according to forum posts on SO and on other places, I can increase the limit with the below code.

void SetThreads(int threads)
{
    ThreadPool.SetMaxThreads(threads, threads);
    ThreadPool.SetMinThreads(threads, threads);
}

However, when I set the above to some arbitrarily high number, for example, 2000, and queue ~1000 items, I still only have ~33 threads running (.NET CLR takes ~5 threads), and ThreadPool.GetAvailableThreads() returns 1971 threads remaining.

Why doesn’t the code above work?

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1 Answer

  1. Editorial Team

    From the MSDN :

    When demand is low, the actual number of thread pool threads can fall
    below the minimum values.

    Read this too: Patterns for Parallel Programming: Understanding and Applying Parallel Patterns with the .NET Framework 4

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