Programmer's Guide to JDK Flight Recorder
summary
Walks through exact APIs and commands that start stop dump and stream recordings, shows jcmd and JFR tool usage, and demos programmatic hooks like RecordingStream and RemoteRecordingStream that trigger dumps when CPU > 0.8. Claims default configuration costs <1% overhead and profiling <2%, default max file 250MB, JDK 21 adds 70 predefined views, JFR ships ~160 builtin events, JFR is available in OpenJDK and has support for virtual threads, and unit tests use RecordingStream stop (new in JDK 20).
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chapters (4)
- 0:00Start
- 35:05Question 1."Is the JDK Flight Recorder available for free in all OpenJDK versions?"
- 35:42Question 2."In order to make use of JFR, are there any default events included, or do you have to program your own custom events?"
- 36:44Question 3."Does JFR have support for virtual threads?"
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