There are two built-in profiles, “default” and “profiling.” You can also configure and use custom profiles via Mission Control UI. It also determines per probe configuration (frequency for method sampling, duration threshold for I/O events, etc.). The profile defines which kind of events would be collected during the session. Starting a flight recording session also requires a configuration (called a profile). It is also possible to activate a JFR session on startup via JVM command-line options (this is very useful if you want to profile applications during startup).
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