Question How to get a rolling recording into disk, with a maximum age? Context When something goes bad in my server, I want to be able to dump the profiling information of the hours prior and analyse it, to know what went wrong. As I don’t know when things will go bad, the JDK should be continuously saving the events
Tag: jfr
JFR: OutOfMemoryError while reading .jfr file
I’m trying to analyze a large Flight Recorder file (1.5 GB) that I created previously. When executing the jfr print command, the tool runs into an OutOfMemoryError: Is there a way to increase the heap size (-Xmx) for the jfr tool itself? I haven’t found a corresponding option in the documentation. Any help is appreciated 🙂 Answer As suggested by
Java Flight Recorder – find file descriptor leak
M Java application probably has a file descriptor leak, since I’m getting a Too many open files exception. I’m running my application with JFR, and when I inspect File I/O I barely see any I/O count. Is it possible to use JFR for finding code which open files but not closes them? Answer No, JFR can’t track file handles. You
Java Flight Recorder comprehensive list of VM options for OpenJDK 8 & OpenJDK 11
Is there a way to get a comprehensive list of VM options for Java Flight Recorder (JFR). I am particularly interested in OpenJdk 8 & OpenJdk 11 so far I find this list quite usefull https://chriswhocodes.com/hotspot_options_jdk8.html also java -XX:+UnlockDiagnosticVMOptions -XX:+PrintFlagsFinal -version Is there any resource that would provide list of options available for JFR? Answer I think the most comprehensive