How Can I Control Processor Affinity for Threads and Processes in .NET?

Fine-tuning Processor Affinity in .NET Applications

Optimizing resource allocation is crucial for high-performance .NET applications. One effective technique involves assigning threads or tasks to specific processors. This guide demonstrates how to achieve this in C#.

Direct Control with ProcessThread.ProcessorAffinity:

The ProcessThread class offers precise control over processor affinity via the ProcessorAffinity property. This property takes an IntPtr representing a bitmask, with each bit corresponding to a processor. The following example illustrates how to set affinity for the current process and a specific thread:

using System.Diagnostics;

Process currentProcess = Process.GetCurrentProcess();
long affinityMask = 0x000F; // Utilize the first four processors
currentProcess.ProcessorAffinity = (IntPtr)affinityMask;

ProcessThread firstThread = currentProcess.Threads[0];
affinityMask = 0x0002; // Assign to the second processor
firstThread.ProcessorAffinity = (IntPtr)affinityMask;

Suggestion-Based Affinity with Thread.IdealProcessor:

The Thread.IdealProcessor property provides a less forceful approach. It suggests a preferred processor for a thread, but the scheduler isn't obligated to comply.

Prioritizing Tasks and CPU Usage:

The Task Parallel Library (TPL) offers TaskExtensions.AsTask for high-priority task execution. However, the actual CPU usage remains subject to system factors such as core count and overall system load.

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