Java thread affinity

Question

Does anybody know of a way to lock down individual threads within a Java process to specific CPU cores (on Linux)? I've done this in C, but can't find how to do this in Java. My instincts are that this will require a JNI call, but I was hoping someone here might have some insight or might have done it before.

Thanks!

Answer 1

You can't do this in pure java. But if you really need it -- you can use JNI to call native code which do the job. This is the place to start with:

http://ovatman.blogspot.com/2010/02/using-java-jni-to-set-thread-affinity.html

http://blog.toadhead.net/index.php/2011/01/22/cputhread-affinity-in-java/

UPD: After some thinking, I've decided to create my own class for this: ThreadAffinity.java It's JNA-based, and very simple -- so, if you want to use it in production, may be you should spent some time making it more stable, but for benchmarking and testing it works well as is.

UPD 2: There is another library for working with thread affinity in java. It uses same method as previously noted, but has another interface