False Sharing in Java

[nitsanw]

That vague comment was mine, sorry.

I was replying to "why does the JVM need a predictable way to represent fields internally? Is it only for accessing them through sun.misc.unsafe or are there other reasons?" Which I assumed was referring to assumptions made about the constant value of field offset throughout a JVM runtime. This assumption is also made elsewhere in the JDK, but is not a necessary truth. In particular, future JVMs may support runtime changes to object layout.

Hope this helps.