Java Flight Recorder

في هذا الدرس

record JFR data from a running service.

الموضوعات المخطط لها

• JFR is a low-overhead event recorder built into the JVM, with a continuous mode.
• Start at launch: -XX:StartFlightRecording=filename=shop.jfr,duration=120s, or on a live process: jcmd <pid> JFR.start, then JFR.dump.
• Events: CPU samples, allocation, GC, locks, I/O, thread states, exceptions.
• Profiles (default vs profile settings) trade detail against overhead.
• Verify option details for your JDK before recording.