youtu.be/CvcrrxUeSZw AI sandboxing. Simple restructure. Lists vs vectors, byte slices, CallGraph in SeaOfNodes, LTO, repl, separate compilation. Literals: dict, array, XTC. JSON f64, i64, NaN. Twitter war story. String formatting. Overloading, type classes, ambiguous defs

From John Rose on Twitter Here is a deep dive from Netflix about using #Java AOT caches (from Project #Leyden). Big kudos to Martin Chalupa and Ian Brown for putting the parts together, and explaining how it works at #JavaOne. youtu.be/4kEh8hxAP4U x.com/johnrose00/s...

youtu.be/pBo2MISl7p0 Clang compile speed, constexpr interpreter. Recursive types & type inference. User peephole opts, heroic opts, semantics. Infinite loop opts, Collatz Conjecture, UB. Research vs production compiler

Today, May 22, my book about ZGC is finally ready and available to order! I can recommend reading it if you want to learn more about the magic nature of ZGC. You can order it here (among many places): www.routledge.com/The-Z-Garbag...

🚀 G1 GC: 5-15% Performance Gains with Dual Card Tables Read more: ionutbalosin.com/2026/05/g1-g... #Java #Performance #GarbageCollection #JVM #JDK26

After a year of daily AI-assisted coding, I wrote down what actually works — spec-driven dev, skills as guardrails, incremental verification, and the 4 gaps. ionutbalosin.com/2026/05/tami... AI is an amplifier. It magnifies discipline and chaos with equal enthusiasm. #AI #SoftwareEngineering

🎯 JEP 534 updated to target JDK 27 Title: Compact Object Headers by Default Type: feature Component: hotspot / runtime Release: 27 See openjdk.org/jeps/534

🎯 JEP 523 updated to target JDK 27 Title: Make G1 the Default Garbage Collector in All Environments Type: feature Component: hotspot / gc Release: 27 See openjdk.org/jeps/523

Le replay de ma présentation à Devoxx France qui dévoile toute la magie derrière OpenTelemetry est maintenant disponible pour tous ceux qui n'auraient pas réussi rentrer dans l'amphithéâtre 😇 Bon visionnage 👀 youtu.be/1DYJUF1Rm2M @devoxx.fr #java #opentelemetry

I wrote a 60-page mini-book on Virtual Memory. Going from what it is, through page tables and down to advanced topics like copy-on write, demand paging, TLB shootdowns, NUMA placement, page reclamation algorithms. blog.codingconfessions.com/p/virtual-me...

youtu.be/AzY1zqrewAk AST, Sea of Nodes, V8, C2, SSA-CFG. Ruby IR, opts in parser, inlining, value profiling, Ruby JIT in Rust. CFG & mem aliasing. V8 vs Maglev vs SofN, More & more inlining, LTO, LLVM. SofN - philosophy. Type lattice in pictures, deep dive type impl

I mean, look at this: there is hardly a sub-workload where scores do not improve. The improvements like these are as rare as unicorns. It is likely to be once in a lifetime thing.

Spent better part of my time last few months on this most satisfying piece of work. So many low-level things to obsess about. It was the first time in my life I looked at results, auditing why performance improved on 20+ benchmarks, but not on THIS ONE. github.com/openjdk/jdk/...

🎯 JEP 534 proposed to target JDK 27 Title: Compact Object Headers by Default Type: feature Component: hotspot / runtime Release: 27 See openjdk.org/jeps/534

🎯 JEP 523 proposed to target JDK 27 Title: Make G1 the Default Garbage Collector in All Environments Type: feature Component: hotspot / gc Release: 27 See openjdk.org/jeps/523

youtu.be/hFWiUsG13ZA Simple update. NonBlocking hashmap, LRU, resizing. How-to YouTube. Sea-of-Nodes, phases, GCM, x86 ops, exec binary, risc5 & arm. LLVM JIT, C2, as a lib, PyPy; profile-vs-JIT. Simple design. Security risks for analysis in binary. Range types, lattice

Reggie generates specialized bytecode per pattern (Thompson NFA → DFA → ASM), which achieve 7-389x over JDK `Pattern` depending on the actual pattern, plus linear-time guarantees (no ReDoS). API is similar to `Pattern` : `Reggie.compile(…)` 91.3% PCRE conformance, growing!

Reggie - Hybrid Compile-Time and Runtime Optimized Regex for Java github.com/DataDog/java... from x.com/BachorikJ

youtu.be/7OY9phx8y34 Performance antipatterns talk by Cliff. Q & A, Lambdas, map, flatmap, IO bound , finals, Immutability, const class. CAS in Clojure. Ryan update on Quxlang

Dissecting the CPU-memory relationship in garbage collection (OpenJDK 26) L: https://norlinder.nu/posts/GC-Cost-CPU-vs-Memory/ C: https://news.ycombinator.com/item?id=47137140 posted on 2026.02.24 at 08:49:39 (c=1, p=5)

You can beat the binary search https://lemire.me/blog/2026/04/27/you-can-beat-the-binary-search/

Ever looked at a HotSpot error file and thought “nope”? I wrote a guide + built a VSCode highlighter and a browser redaction tool (using @graalvm.org). mostlynerdless.de/blog/2026/04...

🎓 JEP 534 moved to candidate Title: Compact Object Headers by Default Type: feature Component: hotspot / runtime See openjdk.org/jeps/534

youtu.be/7QWHRY07W2U Hashmap perf, concurrent vs nonblocking, choosing your metric. Performance antipatterns (presentation), logging, cost of traces. Exceptions, error codes, stack traces in distributed system, deadlines,exceptions from other threads

youtu.be/20z1TDqST5k Compiling regexs, Jury duty. LinkedIn talk - for Simple, loading code. Growing a Language. Operator overloading, for/while as functions, overload resolution, c++ templates, python, polymorphism. Back to H-M, implicit conversions, Immutable by default

youtu.be/c2uCdPzRy1w Vibe coding, AI cheating, Simple philosophy, no commit, NBHM, C2/C++/Python perf, Faster C++ compiler. Interviews. PCs & DRAM prices. Graph viewers, Slow & broken build systems.

Java 26 quietly ships `-Xlog:cpu`, and it’s a perfect match with jbang. Run `jbang --java 26 -R=-Xlog:cpu <yourapp>` to see per-thread CPU stats without attaching a profiler. Handy way to sanity-check GC/VM activity.

✏️ JEP 8380294 was drafted Title: Unbiased Stack-Walk API Type: feature Component: hotspot / jvmti See openjdk.org/jeps/8380294

Java 26 / JDK 26: General Availability: mail.openjdk.org/archives/lis... Features: openjdk.org/projects/jdk... Downloads: jdk.java.net/26/ #Java26 #JDK26 #OpenJDK #Java

youtu.be/wTlwnDOQWvQ Compiler driver as a graph; copy on write, modules, classes, lexing, EBNF, parser gens vs recursive decent; ambiguity; oper overload & oper parse; chained opers. Compilers & Type theory, opts, DCE, eval, typescript vs tree shaking vs dyn class load.

✏️ JEP 8357464 was drafted Title: Enhanced Local Variable Declarations (Preview) Type: feature Component: spec / lang See openjdk.org/jeps/8357464

✏️ JEP 8379682 was drafted Title: Make Shenandoah's generational mode the default Type: feature Component: hotspot / gc See openjdk.org/jeps/8379682

youtu.be/PgcitUngWEk Simple update, Graph debugger (qux, S-of-N), Storage types, tagged/untagged unions, Constexpr, partial eval, AST walking. Sea of Nodes eval vs Tier 0 JIT. NonBlockingHashMap design vs caches, hashCode, attack against

✏️ JEP 8344154 was drafted Title: Convenience Methods for JSON Documents Type: feature Component: core / util See openjdk.org/jeps/8344154

New blog: Testing the Datadog Explain Plan Visualizer with Oracle execution plans tanelpoder.com/posts/testin...

youtu.be/E-M2Ccw3Kfw Super light C++ stdlib. Keybindings & cross-OS muscle memory. AIs and their uses. Good CLI tools. VCS. Win 11 bashing. Levo editor story. Simple update - classless main execution, static.

✏️ JEP 8372760 was drafted Title: JFR: In-Process Data Redaction Type: feature Component: hotspot / jfr See openjdk.org/jeps/8372760

Redact sensitive data from Java Flight Recorder and JVM crash logs with jfr-redact, a tool for safely sharing profiling and error files: mostlynerdless.de/blog/2026/02...

youtu.be/I1cdM-K7WIw Coffee Compiler Club - IR and type representations; ptr-pairs (type classes) vs embedded types ptr (java style). LLVM vs C2 object description. Type aliasing & compiler opts. Whole lotta state-of-the-AI conversation

I published a new article in my "Writing a .NET GC in C#" series. This time, we implement a better storage for the handles, and we properly mark them during garbage collection. We also see why DependentHandles are annoying to deal with. minidump.net/writing-a-ne...

Using the #JDK HttpClient, or … not. Well it depends on each one’s use cases. blog.arkey.fr/2026/02/08/t...

youtu.be/aN8-fn5sXME Etherium interp, best? coding practices, getters, setters. Locking, old code in prod. Byzantine vs Paxos. unspec'd JSON, CSV. VMs, Cloud, Erlang, XTC, CPS, hierarchical timewheel. Interactive, gas,quotas. Concurrency, gradle. CI/CD, cbuild demo. comptime, metaprogramming

A free SQL explain plan visualizer tool by @datadoghq Currently for PostgreSQL, MySQL, MSSQL and MongoDB explain.datadoghq.com

✏️ JEP 8376595 was drafted Title: Lazy Constants (Third Preview) Type: feature Component: core / lang Release: 27 See openjdk.org/jeps/8376595

After a long wait, I've finally published the sixth part in my "Writing a .NET Garbage Collector in C#" series. Today, we start implementing mark and sweep. minidump.net/writing-a-ne...

youtu.be/c1idAa4vV54 Concurrent hashmap, malloc vs GC vs thread-local, CAS, contention, atomics, arenas, pools. Capabilities, AI search vs grep. Channels vs mutex vs coroutines vs locks vs fork-join vs NBHM. Hotswap in HS, stack editing , unwinding, dynamic code loading

Updated JOL and heapdump-estimates in it specifically to better support JDK 25. We use this tool to quickly glance where are the opportunities in our real services. Streaming heap dump analysis allows doing this on multi-hundred GB heap dumps. Builds: builds.shipilev.net/jol/

Async-profiler has released an update that includes native lock profiling and a latency filter. Consequently, ap-loader, which wraps async-profiler in a platform-independent JAR, has also been updated: github.com/jvm-profilin...

JFR is great, but do you know how to read and write JFR files programmatically? Learn more in this week's blog post: mostlynerdless.de/blog/2026/01...

I did some OpenJDK commit exploration and I thought I could blog about it too. Here it is: questdb.com/blog/jvm-cur...