Java 25’s new CPU-time profiler

More than three years in the making, with a concerted effort starting last year, my CPU-time profilerlandedin Java with OpenJDK 25. It's an experimental new profiler/method sampler that helps you find performance issues in your code, having distinct advantages over the current sampler. This is what this week's and next week's blog posts are all about. This week, I will cover why we need a new profiler and what information it provides; next week, I'll cover the technical internals that go beyond what's written in the JEP. I will quote theJEP 509quite a lot, thanks to Ron Pressler; it reads like a well-written blog post in and of itself.

Johannes Bechberger

There's also a third entry detailing queue sizing, and a fourth entry going into the removal of redundant synchronisation.