jfr

JDK flight recorder backport in RedHat OpenJDK 8

由 廉价感情. 提交于 2020-05-30 07:27:48
问题 I would like to ask, if anybody knows date or more informations about JDK flight recorder backport in the RedHat OpenJDK 8 production release (for RHEL 7)? I've tried the last build (1.8.0_242-b08) that doesn't contain it yet, and based on this article (https://www.i-programmer.info/news/80-java/13279-openjdk-8-to-get-jdk-flight-recorder.html) I thought that it will contain and nowhere can not find more information. Best regards and thanks for your answers. 回答1: Thank you for your answers. I

Where can I download Java Mission Control(7) (OpenJDK11 or higher)? [closed]

由 人走茶凉 提交于 2020-05-25 09:29:27
问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . Java Mission Control(JMC) was announced to be handed over from Oracle to the open source community from JDK 11 onwards. However JMC is not bundled with the OpenJDK11 releases. I read that JMC will be provided as separate download here, but there are no builds to download. Also Oracle no

Does JMC Flight Recording force Full GC?

由 假如想象 提交于 2020-01-24 00:40:28
问题 I am experiencing some performance related issues (works ok most of the time, and from time to time there's a spike in the response time from 100ms to 4/5s with no apparent reason) in services implemented in OSB. One of the hypothesis to explain this situation is the fact that the JVM could be performing a Full GC during those spikes and we are monitoring the JVM using mission control. The admins tell me that the jvm is running with full gc's disabled, using G1GC and I can see that in the

Java flight recorder programmatically parsing

由 China☆狼群 提交于 2019-12-20 03:07:07
问题 I'm trying to Parse JFR dump using JAVA. I followed this blog, http://hirt.se/blog/?p=446 . But these methods are deprecated now. Is there any supported parsers for JFR to JAVA? if not can you point me is it possible to retrieve data from JFR dump? 回答1: As Klara mentioned, there is no officially supported parser. Hopefully the JFR parser will be supported officially in JDK 9. For now, you can use the APIs mentioned in Hirt's blog. Don't worry about those being deprecated. :) I have

JMC parser for Java JFR dumps using Jrockit

由 耗尽温柔 提交于 2019-12-11 11:32:25
问题 I got to know that parsing JFR into Java can be done by unsupported parsers like JMC parser using jrockit from this. Also I figured during the flight recording there will be lot of events captured. If I want to retrieve data values from various events such as Stack trace under Events tab, Hot method under Code tab, Call tree under Code tab etc etc. How do I filter? Example image for example I was able to filter Call tree using following code as mentioned in jfr-flame-graph. final String EVENT

How to add enable flag for Flight Recorder in Maven project?

由 你离开我真会死。 提交于 2019-12-08 04:00:37
问题 I'm just about start using Java Mission Control 5.3.0 . I have added -XX:+UnlockCommercialFeatures -XX:+FlightRecorder into my web-app's jetty.template. Then I start the web-app with mvn jetty:run . But while I was starting Flight Recorder I got the problem occurred pop-up as below. 'Start Flight Recording.. (Last attempt failed)' have encountered a problem.Commercial features are not enabled. In JDK7u4 and above,the JVM must be started with -XX:+UnlockCommercialFeatures -XX:+FlightRecorder .

How to add enable flag for Flight Recorder in Maven project?

由 假装没事ソ 提交于 2019-12-06 15:43:37
I'm just about start using Java Mission Control 5.3.0 . I have added -XX:+UnlockCommercialFeatures -XX:+FlightRecorder into my web-app's jetty.template. Then I start the web-app with mvn jetty:run . But while I was starting Flight Recorder I got the problem occurred pop-up as below. 'Start Flight Recording.. (Last attempt failed)' have encountered a problem.Commercial features are not enabled. In JDK7u4 and above,the JVM must be started with -XX:+UnlockCommercialFeatures -XX:+FlightRecorder . And I also try adding the flags as below into pom.xml but it doesn't work. <jvmArgs> <jvmArg>-Xmx128m<

Java Mission Control Heap Profile

由 ≯℡__Kan透↙ 提交于 2019-11-29 02:05:19
I am playing with the new Java Mission Control Profiler that is coming with the Java 7u40 and I cannot make it to profile allocation and collect object statistics . No matter what I do, I cannot see any statistics in the Memory -> Object Statistics window. The following command starts the collection: jcmd <pid> JFR.start duration=60s settings=profile filename=alloc-prof.jfr The Java Mission Control documentation does not mention any specific options to enable object profiling. I have tried to create my own profile and set : <flag name="heap-statistics-enabled" label="Heap Statistics">true<

Java Mission Control Heap Profile

由 半世苍凉 提交于 2019-11-27 16:29:23
问题 I am playing with the new Java Mission Control Profiler that is coming with the Java 7u40 and I cannot make it to profile allocation and collect object statistics . No matter what I do, I cannot see any statistics in the Memory -> Object Statistics window. The following command starts the collection: jcmd <pid> JFR.start duration=60s settings=profile filename=alloc-prof.jfr The Java Mission Control documentation does not mention any specific options to enable object profiling. I have tried to
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