Got some new prints in the @gitbutler.com office

NVIDIA Adds Official Support For RHEL-Compatible Distributions Like AlmaLinux With CUDA 13.2 - www.phoronix.com/news/NVIDIA-Official-RHE...

Defer available in gcc and clang About a year ago I posted about defer and that it would be available for everyone using gcc and/or clang soon. So it is probably time for an update. Two things have happened in the mean time: A tec…

Defer available in GCC and Clang
gustedt.wordpress.com/2026/02/15/d...

Join us for the HPSF Community Summit 2026 in Braunschweig, Germany, February 25-27! 💚

Learn what’s new with HPSF projects, give us feedback on your use of HPSF software, meet with project communities, and tell us how to grow and improve them.

Details: hpsf.io/event/hpsf-c...

Intro to the GitButler CLI YouTube video by GitButler

Love the GitButler GUI but miss your CLI? Have we got the solution for you!

youtu.be/Jg8L3SbgZ3o?...

Release v0.37.0 · jj-vcs/jj About jj is a Git-compatible version control system that is both simple and powerful. See the installation instructions to get started. Release highlights A new syntax for referring to hidden and...

#jj-vcs 0.37.0 came out yesterday! im intrigued by the new divergent change syntax, seems very neat

github.com/jj-vcs/jj/re...

Please note: Any claims of AI Exascale, AI Zettascale or beyond computing power are just baloney. Real computing power is measured in FP64. Period.

AMD embraced utter stupidity by adopting this terminology by the leather jacket man.

It's a really shame!

#CES2026 #AMD

LLVM 22 Lands NVIDIA Olympus CPU Scheduling Model - www.phoronix.com/news/NVIDIA-Olympus-Sche...

title slide of talk being given at Rust Nation UK: [Title] Rust for Foundational SW or: Safety-Critical Software in Rust

ever curious why people that work in safety-critical systems want to use Rust?

here's the title slide for the talk i'll give at @rustnationuk.bsky.social about this

Day 24 of #AoCO2025! A loop summing 0+1+2+...+n. GCC unrolls it. Clang does something jaw-dropping: the loop vanishes entirely, replaced by a direct calculation. How?!

xania.org/202512/24-cu...
youtu.be/V9dy34slaxA

Day 23 of #AoCO2025! Switch → jump table? Sometimes. Other times: arithmetic, bitmasks, or something cleverer. Compilers have more tricks than you think.

xania.org/202512/23-sw...
youtu.be/aSljdPafBAw

Day 22: String comparison against "ABCDEFG" should call memcmp, but Clang inlines it with some clever memory tricks. How does it compare 7 bytes so efficiently? xania.org/202512/22-me... youtu.be/kXmqwJoaapg #AoCO2025

Day 21: Summing integers? Compiler vectorises beautifully—8 at a time! Switch to floats? It refuses, doing each add individually. Same code, totally different output. Why? 🤔

xania.org/202512/21-ve...
youtu.be/lUTvi_96-D8

#AoCO2025

Day 20: Process 65,536 integers one at a time? Nah. The compiler vectorises it to handle 8 at once — same code, 8× faster! SIMD auto-vectorisation is compiler magic 🚀

xania.org/202512/20-si...
youtu.be/d68x8TF7XJs #AoCO2025

Day 19: Recursive functions calling themselves endlessly — stack growth? Nope! The compiler turns recursion into loops. Tail call optimisation is magic ✨

xania.org/202512/19-ta...
youtu.be/J1vtP0QDLLU #AoCO2025

Day 18: Function with fast & slow paths. Inline = code bloat. Don't inline = slow fast path. Can't have both—or can you? The compiler finds a surprising way out of this dilemma.

xania.org/202512/18-pa...
youtu.be/STZb5K5sPDs
#AoCO2025

Actually, this die configuration is not new information, it was already mentioned on this removed slide:
(Although the CPU die's CBB name is seems still new.)

Deferred Conflict (with Steve Klabnik) | Dead Code A podcast about how the software industry got this way

Listen: shows.acast.com/dead-code/e...

It’s safe to assume that the HPC scheduling space is going to be in a state of Flux for quite some time to come…

(I see what I did there. With consummate apologies to @vsoch.bsky.social and @tgamblin.bsky.social in advance 🤣)

How have servers and the cloud evolved in the last 30 years, and what might be next? @bcantrill.bsky.social has been at the thick of the industry since the Dotcom Boom, and shares fascinating stories.

Bryan is one of my all-time favorite people to talk with - don't miss this one.

(cont'd)

Day 17: Inlining — the ultimate optimisation ✨

A function gets inlined, half vanishes. The assembly is cleaner than hand-written. How does copy-paste make code disappear?

xania.org/202512/17-in...
youtu.be/JFHfFTvMPp0

#AoCO2025

Day 16: Calling conventions matter! Pass 8 chars as separate args: stack spillage. Pack them in a struct: single register. Sometimes structs are MORE efficient than separate parameters!

xania.org/202512/16-ca...
youtu.be/Yaw8AMoP4sI
#AoCO2025

Day 15: Two nearly identical loops—one writes to memory every iteration, the other stays in registers. Same code, wildly different performance. The culprit? Aliasing!

xania.org/202512/15-al...
youtu.be/PPJtJzT2U04

#AoCO2025

Does this mean no more dirt-cheap NRE from Slurm? Or will Slurm development no longer be coin-operated? Would love to see serious engineering effort go into modernizing Slurm, but this could go in many directions.

Day 14: Add ONE global counter to your loop and watch LICM vanish—strlen called every iteration! Why would incrementing an unrelated variable break the optimisation? 🤔

xania.org/202512/14-li...
youtu.be/OwFNblEEAXo
#AoCO2025

Day 13 of Advent of Compiler Optimisations! 🔄

Loop calling a function whose result never changes? One compiler hoists it out automatically. The other… doesn't. Even with hints!

xania.org/202512/13-li...
youtu.be/dIwaqJG0WDo

#AoCO2025

Cursed code:

void* f(void *p) {
return p + 1;
}

Both gcc and clang support void* arithmetic as an extension in C:

gcc.gnu.org/onlinedocs/g...

-pedantic FTW!

Godbolt: godbolt.org/z/rcrqWvMGW

#Programming

Day 12 of Advent of Compiler Optimisations! A loop that checks the same thing every time. The compiler's solution? Make the code bigger to make it faster. Wait, what? xania.org/202512/12-lo... youtu.be/-VCrYshE7iQ #AoCO2025

Day 11: A clever bit-counting loop using the "clear bottom bit" trick. Change one compiler flag and... wait, what just happened to my loop?! Pattern recognition at its finest.

xania.org/202512/11-po...
youtu.be/Hu0vu1tpZnc
#AoCO2025

Kokkos 5.0 is officially out. ✨

Details:
- Moves the project to C++20
- Retires older interfaces, reducing complexity for future work
- Ideal time for teams to review workflows

Read the full update here: hpsf.io/blog/2025/ko...