Issue
I have a Spring Batch application packaged as a JAR file as highlighted below
java -Xms2048m -Xmx2048m -Ddivision=25 -Ddate= -Denv=dv -Dconn=45 -jar demo-jobs*.jar job-definition.xml jobName -next
I want to optimize the overall execution time, so I'm trying to trace the average execution time for all the methods. I am using Java Flight Recorder.
I could see the execution percentage, but not the average execution time.
In the Oracle documentation - https://docs.oracle.com/javase/10/troubleshoot/troubleshoot-performance-issues-using-jfr.htm#JSTGD307 - they showed the methods with their execution time.
However, I don't see anything in the "Contention" tab
What am I missing? Why is it not showing the methods and their execution time as shown in the Oracle article?
Solution
To keep overhead reasonable (less than 1%), latency/contention related events are only recorded if they exceed a threshold, by default 20 ms.
You can set the threshold to 0 ms in the wizard, when you start a recording, but beware there can be an enormous number of events.
Answered By - Kire Haglin
