![]() ![]() JMC/JFR: Kotlin spezial: Profiling/Monitoring with joy (talk slides).Using Java Flight Recorder and Mission Control (Part 1) | foojay.Hunting down code hotspots is probably the most common task for Java profilers.Improving the performance of the Spring-Petclinic sample application (part 1 of 5).In addition to the profiling-focused blogs there are also one-of resources in other locations: Only the tools themselves got more powerful. ![]() I start with a collection of notable blogs which you definitely read if you're interested to go deeper into profiling:Įven the decade-old posts on these blogs are worth reading, as the foundations of profiling did not change in the last few years. Many of these talks and people were recommended elsewhere on the internet, on blogs, on Twitter, or in private conversations. This list includes talks on a variety of profilers, ranging from deep dives to overviews. While working on this talk, I collected a list of interesting conference talks on this topic: Which and how? The consensus seems to be to use JFR or async-profiler with -jfrsync and JMC as a profile viewer.Why? Profiling helps you find the parts of your code that are slow and that are worth to be fixed.This can be seen in the lack of entry-level material on this topic and even the little that is out there is distributed across multiple conference websites, blogs, YouTube channels, and Twitter accounts.Ī few months ago I started working on this topic and as a result, held a talk at the Java User Group Karlsruhe in the middle of October: It is an introductory talk answering the simple questions: Why should we profile? Which profilers to use? How to obtain and view these profiles? A recording can be seen on YouTube: The problem is that most of the open-source profilers are targeted to the OpenJDK developers (or their colleagues), even if they won't admit it. This is a pity as profiling should be a part of the tool belt for every experienced developer (not just for Java). ![]() One of the reasons for this is a lack of available information and thus knowledge for everyday Java developers. The few that profiled before usually used VisualVM as a student and maybe JProfiler or YourKit years ago at work. When I ask Java developers whether they do profile, the answer is usually "no". JEP Candidate 435, in the SapMachine team at SAP. A JVM developer working on profilers and their underlying technology, e.g. ![]()
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