Garbage Collectors

2026

• Principles of Memory Management in Java by Ron Pressler on September 4, 2026
• Quality Outreach Heads-up - JDK 27: Default G1 in All Environments by Nicolai Parlog on July 20, 2026
• ZGC: A Decade of Redefining Java Performance by Stefan Johansson (alum) on June 30, 2026
• Simplifying Weak Reference Processing in ZGC by Fredrik Hammarberg (guest) on June 11, 2026
• Episode 59 “Java *is* Memory Efficient” [AtA] by Ron Pressler, Nicolai Parlog on May 28, 2026
• JEP targeted to JDK 27: 523: Make G1 the Default Garbage Collector in All Environments by Thomas Schatzl on May 26, 2026
• Episode 54 “How JDK 26 Improves G1's Throughput” [AtA] by Stefan Johansson (alum), Nicolai Parlog on April 9, 2026
• JDK 26 G1/Parallel/Serial GC changes by Thomas Schatzl on February 28, 2026
• Dissecting the CPU-Memory Relationship in Garbage Collection by Jonas Norlinder on February 24, 2026

2025

• Garbage Collection in Java: Choosing the Correct Collector by Stefan Johansson (alum) on November 29, 2025
• JEP targeted to JDK 26: 516: Ahead-of-Time Object Caching with Any GC by Erik Österlund on November 13, 2025
• JEP targeted to JDK 26: 522: G1 GC: Improve Throughput by Reducing Synchronization by Ivan Walulya, Thomas Schatzl on November 5, 2025
• NUMA-Aware Relocation in ZGC by Joel Sikström (alum) on October 24, 2025
• Three Upcoming G1 Improvements - Inside Java Newscast #99 by Nicolai Parlog on October 23, 2025
• Evolving ZGC's Pointer Color Palette #JVMLS by Erik Österlund on October 6, 2025
• JDK 25 G1/Parallel/Serial GC changes by Thomas Schatzl on September 8, 2025
• GC-Agnostic Load Barriers for Ahead-of-Time Compilation by Paul Hübner on August 27, 2025
• ZGC - Paving the GC On-Ramp by Erik Österlund on July 10, 2025
• Quality Outreach Heads-up - Separate Metaspace and GC Printing by Billy Korando on June 9, 2025
• Java 24, Faster Than Ever by Per-Ake Minborg on May 17, 2025
• Mastering JVM Memory Troubleshooting - From OutOfMemoryErrors to Leaks by Poonam Parhar on May 15, 2025
• Garbage Collection in Java: The Performance Benefits of Upgrading by Stefan Johansson (alum) on May 14, 2025
• How ZGC Allocates Memory for the Java Heap by Joel Sikström (alum) on April 17, 2025
• JDK 24 G1/Parallel/Serial GC Changes by Thomas Schatzl on April 7, 2025
• New Write Barriers for G1 by Thomas Schatzl on April 2, 2025
• Java 24 Release Notes Overview for Operations by Billy Korando on March 29, 2025
• How Can Machine Learning Assist to Improve JVM Performance by Yagmur Eren on March 9, 2025
• Garbage Collection in Java - The progress since JDK 8 by Stefan Johansson (alum) on February 15, 2025
• Quality Outreach Heads-up - JDK 25: Proposal to Deprecate for Removal -UseCompressedClassPointers by Billy Korando on February 6, 2025
• JVM Tuning with Machine Learning on Garbage Collection Logs by Yagmur Eren on January 13, 2025
• Using Buddy Allocators to Reduce Inter-Page Fragmentation in ZGC by Casper Norrbin on January 8, 2025

2024

• Mark–Scavenge: Waiting for Trash to Take Itself Out by Jonas Norlinder, Erik Österlund, Tobias Wrigstad, David Black-Schaffer (guest) on November 22, 2024
• ZGC Automatic Heap Sizing #JVMLS by Erik Österlund on November 9, 2024
• JEP targeted to JDK 24: 490: ZGC: Remove the Non-Generational Mode by Axel Boldt-Christmas on November 1, 2024
• JEP targeted to JDK 24: 475: Late Barrier Expansion for G1 by Roberto Castañeda Lozano, Erik Österlund on October 18, 2024
• Java's Fraught Relationship with Cyclic Object Graphs by Stuart Marks on October 15, 2024
• Project Lilliput - Beyond Compact Headers #JVMLS by Roman Kenke (guest) on September 6, 2024
• JDK 23 G1/Parallel/Serial GC changes by Thomas Schatzl on July 24, 2024
• Addressing Fragmentation in ZGC through Custom Allocators by Joel Sikström (alum) on June 19, 2024
• JEP targeted to JDK 23: 474: ZGC: Generational Mode by Default by Axel Boldt-Christmas on May 7, 2024
• JDK 22 in Two Minutes! - Sip of Java by Billy Korando on March 21, 2024
• Netflix - Bending Pause Times to Your Will with Generational ZGC by Danny Thomas (guest) on March 6, 2024
• When Should a Compiler Expand Garbage Collection Barriers? by Roberto Castañeda Lozano on February 16, 2024
• JDK 22 G1/Parallel/Serial GC changes by Thomas Schatzl on February 9, 2024

2023

• JDK 21: The GCs keep getting better by Stefan Johansson (alum) on December 14, 2023
• Java 22 Unpacking - Inside Java Newscast #59 by Nicolai Parlog on December 7, 2023
• JEP targeted to JDK 22: 423: Region Pinning for G1 by Hamlin Li (guest) on December 1, 2023
• Introducing Generational ZGC by Billy Korando on November 28, 2023
• Hazelcast Jet on Generational ZGC by Stefan Johansson (alum) on November 7, 2023
• Reducing P99 Latencies with Generational ZGC by Stefan Johansson (alum) on October 21, 2023
• G1: Java's Default Garbage Collector - Stack Walker #4 by Billy Korando on October 15, 2023
• Generational ZGC - Sip of Java by Billy Korando on October 9, 2023
• What is… a Concurrent Undo Cycle by Thomas Schatzl on October 4, 2023
• Java 21 JVM and GC Improvements #RoadTo21 by Billy Korando on September 3, 2023
• JVMLS - Generational ZGC and Beyond by Erik Österlund on August 31, 2023
• G1/Parallel/Serial GC improvements in JDK 21 by Thomas Schatzl on August 10, 2023
• Optimizing Memory Utilization with Automated Heap Sizing in ZGC by Marina Shimchenko (guest) on June 20, 2023
• Preserving the Mental Map when Visualizing Dynamic Graphs by Emmy Yin (guest) on June 12, 2023
• All That is in Java 21?! - Inside Java Newscast #50 by Nicolai Parlog on June 8, 2023
• UseDynamicNumberOfCompilerThreads and Memory Footprint by Poonam Parhar on May 30, 2023
• Save 10-20% Memory With Compact Headers - Inside Java Newscast #48 by Nicolai Parlog on May 11, 2023
• JEP proposed to target JDK 21: 439: Generational ZGC by Stefan Karlsson on May 4, 2023
• Z Garbage Collector: The Next Generation