How Can I Lock Threads to Specific CPU Cores in Java?

Locking Threads to Specific CPU Cores in Java: A JNI-Based Approach

In Java, maintaining thread affinity, or assigning specific threads to particular CPU cores, is not directly supported. However, this can be achieved through the use of a JNI (Java Native Interface) call to native code that can manipulate CPU affinity.

JNI-Based Methods

The following resources provide guidance on how to set thread affinity using JNI:

• [Using Java JNI to set thread affinity](http://ovatman.blogspot.com/2010/02/using-java-jni-to-set-thread-affinity.html)
• [CPU/Thread Affinity in Java](http://blog.toadhead.net/index.php/2011/01/22/cputhread-affinity-in-java/)

Custom ThreadAffinity Class

For a more convenient solution, you can create a custom Java class, such as ThreadAffinity.java, that uses JNA (Java Native Access) to manipulate thread affinity. This class provides a simple and stable interface for managing thread-to-core binding.

Alternative Library

An alternative library for working with thread affinity in Java is also available at:
[https://github.com/jvm-profiling-tools/affinity](https://github.com/jvm-profiling-tools/affinity)

This library uses the same JNI-based approach but offers a different interface. It is suitable for both benchmarking and production use cases.

Note:

It's important to note that manipulating thread affinity in Java through JNI can be platform-dependent. Make sure to test your code on the specific platform you intend to deploy on.

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