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Questions tagged [jfr]

JRockit/Java/JDK Flight Recorder (JFR), a performance monitoring and profiling tool

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Method Profiling of Java Mission Control

In the method profiling area of JMC, I could observe some methods are annotated with JIT_COMPILED and some methods are annotated with INLINED. For those methods annotated with INLINED, could I also say they are JIT_COMPILED too?
Bostonian
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Run JMC tool rools programmatically

My goal is to write Java class that will analyze jfr dump and give warnings like JMC tool like in attached screenshot. For example: "There are long socket read pauses" or "The JVM was paused for 100 % during ..." etc. I saw an example of…
user9517026
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Can you turn on JFR to be automatic every time JVM starts?

I am using java 8. Is it possible to enable running JFR automatically? meaning when JVM runs, it creates JFR file and dumps it somewhere, better if it be of my choosing. The reason why I want this is to profile a program that has code from other…
N_N
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To get full stack trace from Method profiling

I have been poking the AZUL JFR profiler to see gaps in my system. But i am not able to get full trace of the call being made. Now since the trace is only till HashMap, how can i get which method is calling it ?
Alpit Anand
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JCMD command is not listing the java process

I have a java process named app created under abc user. Now, when I am executing the jcmd command as abc user to list the java processes, it is not listing the app. At the same time, ps aux | grep java command is listing it. Only jcmd command has…
Eli Johnes
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JAVA JFR call-stack sampling

How could one use JFR to sample the call stack programmatically? Currently, I'm able to print "events" that occur, but it seems I have to define these myself. I have no idea how to sample the call stack, say, every 10ms, to find most called methods…
myles215
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Java Flight Recorder and JDK Mission Control : Method sampling not including methods of java.nio package?

I suspected a method in my code to be very slow when listing files in a directory containing thousands of files (more than 60s). So I put some logs in my code and it confirmed me that this part was slow. It then used JFR to see if it was correctly…
Olivier Masseau
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What is JFR parameter filename meaning? File ends up being empty after exit

I have situation where I start JDK18 jvm from c++ code to produce vst plugin goal being to implement audio signal algorithms in java side with added value of full java GUI api. My framework works very smoothly apart from the repeatable state where…
Tonecops
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Can't build JMC from source

I need to use JMC to read some JFR files. I've tried to download zip's with compiled projects from Oracle and Azul, but it's not work for me. So I decide to build JMC from the source code. I've download source from here. When I clone project I have…
timetocook420
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How to optimize the Hibernate execution time?

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…
One Developer
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Find application method average execution time?

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…
One Developer
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ReentrantLock in Java Flight Recorder

What kind of a mechanism does a ReentrantLock use? I'm trying to understand where it would show up under a Java Flight Recording. My expectation was that the lock would be under the Java Monitor Wait section but it doesn't appear to be the…
Tim Seevrs
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Reading and parsing stream from FlightRecorderMXBean

I use the following code in order to start JFR recording and to save results in file. The file is indeed created, but how to parse it? I thought it should be jfr file type, but jdk.jfr.consumer.RecordingFile fails to parse it ("java.io.IOException:…
user9517026
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Ansible startup JFR(JDK Flight Recorder) in many of Containers

I have docker swarm cluster.include five nodes and many of containers.I want to use Ansible startup JFR(JDK Flight Recorder) in many of Containers same time: Step1: docker exec -it containers_name. step2: run JMCD (find java pid) step3: jcmd …
gang yan
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Times Elapsed method seems missing in JMC 7 (in method profiling)

I'm using JMC tool with JFR to do profiling on Java application. After doing a record, and loading the JFR file, when i go to "Method Profiling", i saw Top package and top class and stack trace associated. In stack trace saw number of metod's call…
David Hassoun
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