Leyden is going to be a breakthrough technology for startup and time-to-performance improvements. There are many other things that could be improved, squeezing even more perf. Just a taste:

Cassandra 5.0.2 released: github.com/apache/cassand… It contains an important fix: issues.apache.org/jira/browse/CA…

📣 Calling all Cassandra users! Come explore Apache Cassandra® 5.0 and what to look forward to in Cassandra 5.1. 👁 Join 💧 mck 🦎🐬 and Sami Kaksonen on 30 October. RSVP ➡️ dtsx.io/3U2vMOF

Upgrade time! We just released Apache Kafka 3.8.1! Thanks to all 24 contributors and our RM Josep Prat! For more details checkout out the release blog post: kafka.apache.org/blog#apache_ka…

Hello Apache Kafka 3.9.0! - last release using ZooKeeper - tiered storage is production-ready Plus many more KIPs, improvements, and bug-fixes. For details, check out the release blog post: kafka.apache.org/blog#apache_ka… Thanks to 133 contributors and our RM Colin Patrick McCabe!

Let's say you commit a change that makes an application 0.05% slower. No big deal, right? Well, at the scale of Meta, it is a big deal--a small slowdown for a large application can waste thousands of servers. It's such a big deal that Meta needs a way to catch these performance

Завтра, 12 ноября в 19:00 МСК, в преддверии нового сезона Podlodka Java Crew, посвященного асинхронной архитектуре, Никита Коваль раскроет внутренние механизмы каналов в Kotlin coroutines, которые делают их такими эффективными. youtube.com/live/qCCuSsR0i…

Parts of Leyden and other CDS improvements are now in JDK mainline, in time for JDK 24 fork. The improvements are visible even on simple HelloWorld-style examples. There are even more things to squeeze!

github.com/davidtos/JUring io_uring for Java. "Doing Random reads JUring achieves 33% better performance than Java NIO FileChannel operations for local files and 78% better performance for remote files."

New CMU Database Group Course: Database Query Optimization! A survey of how to build a SQL optimizer from scratch covering foundational and state-of-the-art implementations. All lectures available on Youtube: 15799.courses.cs.cmu.edu/spring2025/

Lilliput 2 (aka 4-byte-object-headers) is now in the Lilliput project repo (based on JDK25-dev). For testing, grab nightlies from here (thanks, Aleksey Shipilëv): builds.shipilev.net/openjdk-jdk-li…

a university undergrad made hash tables faster and broke 40-year-old belief 🤯 for 40 years, it was believed that we cannot have better than O(n) operation for hash table worst case inserts and searches if it uses open addressing - for the hash index, look linearly until you

🚨 There has been a breakthrough in the world of hash tables 🚨 A paper that disproves the longstanding conjecture that uniform hashing is optimal. "Optimal Bounds for Open Addressing Without Reordering" by Martín Farach-Colton, Andrew Krapivin, William Kuszmaul

Interesting issue in OpenJDK's UUID.compareTo(): It uses signed comparisons, which leads to unexpected sorting when the highest bit in either word is set. It can't be fixed since altering a sort order between versions is a big no-no. bugs.openjdk.org/browse/JDK-702…

Profiling: you are doing it all WRONG! The SHOCKING truth about CPU vs. real time Now that I get your attention :) My perf latency profiling changes merged: web.git.kernel.org/pub/scm/linux/… First profiler ever that samples realtime (not CPU time) and suitable for latency optimization

I am excited to finally announce the release of #netty 4.2.0.Final which is in the making for quite some time! This release comes with a lot of new exciting features, including the highly anticipated #io_uring support. See netty.io/news/2025/04/0…

Async-Profiler v4.0 Heatmaps and Native memory profiling and VMStructs-based stack walker github.com/async-profiler…

JEP 509 ("JFR CPU-Time Profiling (Experimental)") added. See openjdk.org/jeps/509

A fantastic blog series on memory subsystem optimizations!!! johnnysswlab.com/memory-subsyst…

🚀 Call for Contributors If you're interested in contributing to the #JVM #Performance #Benchmarks project - an initiative that gained significant traction in the #Java community through our recent #JDK17 and #JDK11 analyses - check out the repo: 🔗 github.com/ionutbalosin/j…