iiinova — where your digital self keeps evolving

Petr Bouda @pbouda.bsky.social · 14/07/2026

🔥 Part 2 of my Jeffrey series on DZone — Differential flame graphs. Set a secondary profile and diff two recordings in one graph: red = regression, green = improvement, deep shades = frames that only exist on one side. No more eyeballing two graphs. dzone.com/articles/jav... #Java

dzone.com

Differential Flamegraphs in Java in Jeffrey Microscope

How to set up a secondary profile and pinpoint the precise frames responsible for a performance change between two JFR recordings.

013

Petr Bouda @pbouda.bsky.social · 13/07/2026

🔥 New on DZone — part 1 of my Jeffrey series, an open-source performance analyzer for Java. Spin up Microscope, drop in a recording, read the flame graph: CPU, allocation, wall-clock. Plus "Copy for AI" to hand hot paths to an LLM. dzone.com/articles/jef... #Java

dzone.com

Jeffrey Microscope for Generating Flame Graphs in Java

Jeffrey Microscope is a deep analyzer for JFR recordings, with a particular focus on flamegraphs generated from stacktrace-based events

042

Reposted by Petr Bouda

Brice Dutheil @bricedutheil.bsky.social · 27/03/2026

HTTP over Unix Domain Socket openjdk.org/jeps/8377806 It's never too late, but still it should have been possible since jdk11. This draft appears to support passing a SocketAddress. But it will only support UDS at least at first. That said other concerns remain... blog.arkey.fr/2026/02/08/t...

blog.arkey.fr

10 or more reasons to not use JDK’s HttpClient

Java mostly, and general tech

031

Reposted by Petr Bouda

Bruno Borges @brunoborges.bsky.social · 18/09/2025

📢 Microsoft is hiring a Senior Compiler Engineer to work on the #JVM! If you have strong compiler / codegen / optimization skills, this could be your next big challenge. Want a referral? Send me a DM. #Hiring #CompilerEngineering #Systems #Microsoft #Java #OpenJDK #Java25

01312

Petr Bouda @pbouda.bsky.social · 16/07/2025

🔥 Jeffrey 0.5 is HERE! 🔥 ✨ Big Upgrade of Java performance detective. Ready to level up your Java performance game?✨ Look at the current features! 🔗 www.jeffrey-analyst.cafe#features #Java #Performance #JFR #OpenJDK

jeffrey-analyst.cafe

Jeffrey - Java Profiling Tool

Jeffrey - Java Profiling Tool for JFR Recordings

142

Reposted by Petr Bouda

Johannes Bechberger @mostlynerdless.de · 10/06/2025

I just updated the JFR events collection (sapmachine.io/jfrevents). It now includes JDK 25 and JDK 26 with my CPUTimeSample event:

053

Reposted by Petr Bouda

Ionut Balosin @ionutbalosin.bsky.social · 17/05/2025

Insightful session on advanced performance analysis with async-profiler, presented by Andrei Pangin. 🎥 www.youtube.com/watch?v=u7-S... #Java #Performance #Profiling

youtube.com

Advanced performance analysis with async-profiler by Andrei Pangin

YouTube video by Devoxx UK

01710

Reposted by Petr Bouda

Jean-Philippe Bempel @jpbempel.bsky.social · 13/05/2025

TIL: since jdk22 you can use the JVM option -XX:LogClassLoadingCauseFor=com.mycompany.MyClass in conjunction with -Xlog:class+load+cause* to find out the stacktrace that triggers the load of the specify class. see github.com/openjdk/jdk/...

github.com

8193513: add support for printing a stack trace on class loading by dougxc · Pull Request #14553 · openjdk/jdk

In the development of libgraal, it has been very useful to see why a given class is loaded (e.g., trying to reduce startup time by avoiding unnecessary eager class loading). One way to do this is t...

11910