https://devops-monk.com/tags/profiling/Recent content in Profiling on Devops MonkHugoen-usMon, 04 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/java11/flight-recorder/Mon, 04 May 2026 00:00:00 +0000https://devops-monk.com/tutorials/java11/flight-recorder/What Is Java Flight Recorder? Java Flight Recorder (JFR) is a low-overhead, always-on profiling and diagnostics framework built into the JVM. It was a commercial feature of Oracle JDK until JEP 328 (Java 11) open-sourced it as part of OpenJDK. JFR collects data about JVM internals and application behaviour — method profiling, allocation, GC pauses, thread states, I/O, lock contention — with a typical overhead of 1–2% in production. This makes it fundamentally different from traditional profilers (JProfiler, YourKit): those profilers cause 10–50% overhead, making them impractical for production.