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  1. JDK
  2. JDK-8238634

Reduce log verbosity of the JFR thread sampler

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Details

    • Bug
    • Resolution: Fixed
    • P3
    • 15
    • 11, 14, 15
    • hotspot
    • jfr
    • b10
    • x86

    Description

      Starting JFR with -Xlog:jfr=info reveals the following log output:

      [0.448s][info][jfr] Flight Recorder initialized
      [0.449s][info][jfr] Repository base directory: C:\Users\egahlin\AppData\Local\Temp
      [0.504s][info][jfr] Creating thread sampler for java:20 ms, native 0 ms
      [0.505s][info][jfr] Enrolling thread sampler
      [0.506s][info][jfr] Enrolling thread sampler
      [0.507s][info][jfr] Updated thread sampler for java: 20 ms, native 0 ms
      [0.508s][info][jfr] Updated thread sampler for java: 20 ms, native 0 ms
      [0.509s][info][jfr] Updated thread sampler for java: 20 ms, native 20 ms
      [0.523s][info][jfr] Started recording "1" (1)
      [0.614s][info][jfr] Updated thread sampler for java: 0 ms, native 20 ms
      [0.614s][info][jfr] Disenrolling thread sampler
      [0.617s][info][jfr] Stopped recording "1" (1). Reason "Shutdown".
      [0.622s][info][jfr] Removed repository C:\Users\egahlin\AppData\Local\Temp\2020_02_06_20_36_29_8184

      The thread sampler is an implementation detail and should have log level debug or trace.

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            egahlin Erik Gahlin
            egahlin Erik Gahlin
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              Created:
              Updated:
              Resolved: