Java 21 JVM & GC Improvements #RoadTo21

A lot has changed with the JVM between JDK 17 and 21. In this episode of #RoadTo21, we will examine the noteworthy changes, where performance has improved, maybe where it has regressed, deprecations you should know about, and a big change to the Z Garbage Collector. -- Chapters -- 0:00 - Intro 0:30 - General Performance Improvements 1:41 - What is Performance 2:50 - Specific Performance Improvements 4:44 - General GC Improvements 5:41 - G1GC Improvements 7:00 - ParallelGC & SerialGC Improvements 7:30 - Generational ZGC 11:39 - Outro -- Resources -- JDK 20 GC Tuning Guide - https://docs.oracle.com/en/java/javase/20/gctuning/introduction-garbage-collection-tuning.html Thomas Schatzl's blog - https://openjdk.org/jeps/439 JEP 439 (Generational ZGC) - https://openjdk.org/jeps/439 Upgrading from Java 17 to 21 #RoadTo21 - https://www.youtube.com/watch?v=5jIkRqBuSBs Java 21: Performance Improvements Revealed - https://minborgsjavapot.blogspot.com/2023/01/java-21-performance-improvements.html Java's Startup Booster: CDS - https://www.youtube.com/watch?v=vvlQv1Dh-HU Java’s Highly Scalable Low-Latency Garbage Collector : ZGC - https://www.youtube.com/watch?v=U2Sx5lU0KM8 Tags: #Java #Java21 #Performance #OpenJDK