Search code examples
javagarbage-collectionjfr

When I use Epsilon GC, I cannot use Flight Recorder

I'm running this command

java -cp "D:\Dev\Books Spaces\Java-11-and-12-New-Features-master\Chapter09" -XX:StartFlightRecording,filename=Epsilon.jfr -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC exploring_further/TestFlightRecorder

The code runs, however the .jfr file is 0 bytes.

When I remove -XX:+UseEpsilonGC and Java defaults to G1 GC. the code runs and the flight recorder dump all the data to file and I can read it.

Why when I use Epsilon the file is empty and how Can I fix it.

On JDK 14 Windows 10.

Solution

  • I fix it by hitting Ctrl+C while the code was running. the .jfr file gets populated and so I can read it. If I wait for OutOfMemoryError The file still 0 bytes.