如何在 jar 文件上运行 javaFlightRecorder

Question

I have a Compiled java program as jar file. Can I run jfr on jar files? how?

Can I specify what I want to benchmark?

Answer 1

Assuming you are running JDK 11, or later, and want the file dump when the program ends:

$ java -XX:StartFlightRecording:filename=dump.jfr -jar benchmark.jar

You can then open up the file in JMC to see information about garbage collection, allocation, hot methods etc.