Grouping frequently called C2 nmethods in CodeCache github.com/openjdk/jdk/... included in jdk 27

youtu.be/V4UlZdW5NpI Newer AI, mem model for Python, volatile, biased locking removal. AA/Simple memory model, LLVM and MSPC bugs. Defending resources in jar/exe. Git philosophy, cross thread access. Simple update, arrays, new, array init. Sea of Nodes as backend

I was wrong on LinkedIn and as a punishment I wrote a blog. The blog includes CPU speculations, conditional instructions, questionable benchmarks and a bit of compiler archeology. Enjoy! The blog: questdb.com/blog/cmov-vs...

Everything you never wanted to know about CPUs, clocks, compilers and confounding factors for benchmarking! #cppnow2026 www.youtube.com/watch?v=EU_n...

🔥 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

🎓 JEP 401 moved to candidate Title: Value Objects (Preview) Type: feature Component: spec See openjdk.org/jeps/401

youtu.be/fHYYLvtp0xk Grad school? Compiler classes, designing course, small community. Teaching Simple. Reg alloc strategies. Contributors. CCC T-shirts. Simple update, modules, ABI. Software licenses. XTC update. Simple BNF, roadmap, arrays, German & small strings opts

Setting references to null for garbage collection? You're probably wasting your time. Here's why that old habit doesn't actually help modern JVMs and what you should focus on instead. By Kirk Pepperdine. foojay.io/today/nullin... #Java #GarbageCollection #JVM

🎯 JEP 535 proposed to target JDK 28 Title: Shenandoah GC: Generational Mode by Default Type: feature Component: hotspot / gc Release: 28 See openjdk.org/jeps/535

✅ JEP 523 is now complete Title: Make G1 the Default Garbage Collector in All Environments Type: feature Component: hotspot / gc Release: 27 See openjdk.org/jeps/523

youtu.be/xP9rioNvErM Simple update, AI for grunt work, AI mimicking code style. Debug broken peepholes. SAT solvers. Strange peephole opts, exploring peep space. Linear logic IR, using many IR`s, war stories, large crash logs, coding styles, optimizer suggested refactoring

I published part 10 of my "Writing a .NET Garbage Collector in C#" series: minidump.net/writing-a-ne... This time, I implemented support for finalization, which reveals some intricacies of the .NET runtime.

youtu.be/jwxfR7fj-UA CI fails, gradle, life beyond claude limits. Build tools, GPT for coding emacs. Local AI, what size, laptop, power. Simple and Quxlang updates, halting problem in const expr, inlining, embed, build.rs, and your compiler as an exec strategy

Let's dig into the new cDAC way to access .NET runtime internals :^) chrisnas.github.io/posts/2026-0... Happy reading!

Built a full terminal emulator in a single Java file. jhostty — probably the most portable terminal in the world. Splits, tabs, 10 themes, per-pane zoom. Powered by GhosttyFX. jbang jhostty@maxandersen github.com/maxandersen/jhostty

Compact Object Headers - Reducing Java's Memory Footprint 👉 ionutbalosin.com/2026/04/comp... #Java #JVM #JDK25 #Performance #OpenJDK

youtu.be/Aj2oegogfbg Lazy init, self modifying code. Memory ordering, volatile, fences, Icache. Dynamic linking, LLVM limitations. Simple: .o, linking, relocating, exports, internal patching, more codegen. Simple phases. Switching to Sea of Nodes(SoN), why or why not?

AI can be used as a trial developer of your software. If an AI can write effective code, test, and tune it, that a great start. In this exercise, I get an AI to write a low latency benchmark in Java for Chronicle FIX (closed source so not indexed) blog.vanillajava.blog/2026/06/test...

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