What Limits Thread Creation in C# Applications?

Practical limits on C# thread creation

C# applications can theoretically create an unlimited number of threads, which means there is no inherent limit on the number of threads. The actual limit depends on the system's physical resources, such as available memory and processing power.

Handling of resource exhaustion

When the system reaches its resource limit, subsequent attempts to create new threads will fail. No exception will be thrown, and the thread creation operation will only return a failure indication.

Considerations in practical applications

Although there is no technical limit, excessive thread creation can reduce performance due to resource competition. Too many threads can lead to problems such as deadlocks, excessive memory consumption, and increased context switching overhead.

Thread pool default settings

In .NET applications, thread pools manage threads responsible for running asynchronous tasks. The default number of threads depends on the framework version and operating system:

• .NET Framework 4.0 (32-bit): 1023
• .NET Framework 4.0 (64-bit): 32767
• .NET Framework 3.5: 250 per core
• .NET Framework 2.0: 25 per core

These values ​​may fluctuate based on hardware and operating system configuration. Consider these limitations when manually creating threads in your application.

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