spf4j alternative java flight recorder

08:56PM Jul 11, 2014 in category General by Zoltan Farkas

With JDK update 40 Oracle released  Java Mission Control + Java flight recorder:

(for more detail see: http://docs.oracle.com/javase/8/docs/technotes/guides/jfr/)

As with spf4j you can implement continuous profiling, and there are some pros and cons of using Java Flight Recorder:

Java flight recorder has some implementation advantages that in theory will provide better data quality. Oracle calls the impact:"Zero performance overhead" which is sales BS, every engineer with the IQ greater than the room temperature knows that there is no such thing. However the overhead can be minimal and potentially lower that the spf4j, although not significantly lower.

But don't get ready to throw spf4j out of the window, java flight recorder is available only on the Oracle JVM, and is free to use in your test environments only, for production environments you will need to buy a license. Meanwhile spf4j you runs on any JVM, and is free to use in any environment.

Also some of the visualization is spf4j are in my view better...

In any case Java flight recorder is a great tool for implementing continuous profiling.

cheers.

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