Recent discussion about the perils of doors in gamedev reminded me of a bug caused by a door in a game you may have heard of called "Half Life 2". I wrote it up over on Mastodon (I find it's better at long threads): mastodon.gamedev.place/@TomF/115589...

Tenstorrent decided to publish the first benchmark data for Ascalon's RVV implementation using the instruction throughput benchmark of my rvv-bench benchmark suite. <3 camel-cdr.github.io/rvv-bench-re... Overall, the results look really good so far:

The most underutilized #AVX512 instruction, VPSHUFBITQMB, is actually very useful for compactly generating a mask with arbitrary criteria based on b[5:0], e.g. to select special characters for parsing: if the second operand is a broadcasted 64-bit vector, where the ones represent the searched values

Intel researchers have proposed Earth, an efficient architecture for RISC-V vector memory access patterns, enabling coalesced strided instruction memory access and buffer-free segment instruction processing. arxiv.org/pdf/2504.08334

Analyzing Modern NVIDIA GPU cores #HardwareArchitecture hgpu.org?p=29837

Oh shit. I just realised no - it really is. I thought I was joking. This is going to require a long and complex backstory. Sorry absolutely not sorry it'll be funny maybe but also you'll learn something.

Hey Folks! cool little FOSS community tool released for simulating the way @tenstorrent.bsky.social Hardware works! Namely the way the tensix instruction stream operates: github.com/tenstorrent/...

I've now published my blog post, "I want a good parallel computer." raphlinus.github.io/gpu/2025/03/... . Thanks much to all the feedback on the draft, I'd like to think I've clarified some things that might have been confusing.

Another round of #Intel ISA defragmentation: Finally, #AVX10_2 is a common ISA for all CPU segments!

Intel AVX10 Drops Optional 512-bit: No AVX10 256-bit Only E-Cores In The Future - https://www.phoronix.com/news/Intel-AVX10-Drops-256-Bit

Lights, camera, action! The world's largest digital camera has been installed at NSF–DOE Rubin Observatory! 🤩 The LSST Camera was the final major component of the observatory. With it in place, Rubin officially enters its final phase of testing!🔭 🔗: rubinobservatory.org/news/lsst-camera-installed

"All lessons in tech will be relearned every 25 years" -Me, looking at us relearning the same thing again

I gotta see so many posts saying "Rust is slower" and like I think these people just evaluate languages and designs based on vibes and not based on like the material output from the compilers.

The chance of asteroid 2024 YR4 hitting out planet in 2032 is now 1.5%, or 1 in 67. The OVERWHELMING likelihood is that the asteroid will miss Earth. But for the first time ever, we might have to seriously consider a deflection mission soon. Let me explain. 🧵 (1/x)

I don't know anything about Raku, but these ads/posters are quite cool. #FOSDEM

Hey folks! Will be talking about the wonderful, wacky world of floating point Sunday afternoon in the HPC, Big data, & Data science dev room at 15:30! #fosdem

“Welcome to the largest open source conference on earth!” #FOSDEM

Hello Brussels ! #FOSDEM

Mmmmmnnnn, data.... thephd.dev/the-big-arra...

SDL 3 Official Release Now Available With New APIs - https://www.phoronix.com/news/SDL3-Official-Release

Linux 6.14 To Add Support For SpacemiT's "Energy Efficient AI" RISC-V CPUs - https://www.phoronix.com/news/Linux-6.14-SpaceMiT-RISC-V-CPUs

So long and thanks for all the fish! I just observed my last star this morning... #GaiaDPAC and @esa.int Gaia teams will do their best to make some great data releases from the data I gathered! #GaiaDR4 in 2026, #GaiaDR5 around the end of the decade. Keep posted for our news today at 10:00 CET.

When you turn it on and it works spectacularly! The Rubin team has successfully completed the first on-sky engineering tests using the 144-Mpx engineering camera. Up next: installing the largest digital camera in the world, LSST Camera! 🔭🧪 rubinobservatory.org/news/rubin-completes-comcam-tests

today i learned x264 has a setting specifically for encoding touhou games

As Harold mentions, Prefix-Or is just v | -v. Segment-scan-or can also be simplified, for example uint64_t s = (v | m) >> 1; return s ^ (s - v) (4 instructions instead of 7).

Some neat tricks for computing bit-wise prefix-or and segmented-prefix-or within scalar registers.

Removing single line comments in multiple lines in parallel with RVV. If anyone has a good AVX512 solution, please share. Inspired by this reddit post: www.reddit.com/r/simd/comme... #RVV #RISC-V #SIMD

Mini thread on developer trust for #AMD. Effectively: the default assumption for AMD is that the stack will be broken. The community tried to help, but as Dave Airlie said years ago “throwing source code over the fence doesn’t make you FOSS” #HPC #ROCm

Ok, reading semianalysis.com/2024/12/22/m... it seems that *most* of AMDs problems could indeed be remedied by having a team of 4-10 very strong engineers focus on always keeping default PyTorch fast on AMD hardware, with nightly regression tests.

Curious what’s going on with the Nvidia CPU team. Will they try and bring the server cores down to desktop? Or launch an embedded core via a next gen Jetson before scaling that up? The new Jetson sure as heck looks like them realizing few hobbyist were interested in Orin nano at 500

Updating the Orin Nano from a $500 & 15W 'low-power' computer vision systems to a $250 & 25W 'Generative AI Supercomputer' is an interesting decision. Looks like they are moving from low-power industrial applications (who might have preferred the NX and AGX) to advertising it to 'AI hobbyists'.

Trying to find the slowest possible RISC-V instruction. This single vlse8.v with a stride of 65536 bytes takes 66 million cycles on a Banana Pi F3. That's 0.04 seconds @1.6GHz #risc-v

Yet another case of “hardware companies should be creating compilers and new programming models instead of just hardware.” NVIDIA is a hardware and compiler company.

There's been a lot of discourse on fixed-length SIMD (e.g. SSE, AVX512, NEON) vs variable-length/vector (SVE, RVV) ISAs. It's probably too early for a definite answer. But as I've designed SIMD image processing algorithms, I'll share a few results.

Here are some slightly tricky RVV mask patterns.

I defended my PhD last Friday (design of efficient data-dependent image processing algorithms). I'd like to thank everyone who has been involved in it (jury members, advisors, colleagues, and of course my family). This has been a long adventure, and I'm now looking forward to the next thing.

Not quite the first, but definitely one of them! Doing RVV1.0 in an OoO machine isn't for the faint of heart. As for ISA, I can confirm that it's fully RVV1.0 compliant. I don't know off hand if we support the custom opcodes we use on Tensix Vector, but I don't believe so!

2x256, full RVV1.0 as well as a fair few of the optional extras to RVV1.0! Phoronix article here: www.phoronix.com/news/LLVM-20... LLVM patches here: github.com/llvm/llvm-pr... One Pager: cdn.sanity.io/files/jpb4ed...

In this paper is presented OMP4Py, the first pure Python implementation of OpenMP, allowing developers to write parallel code with the same level of control and flexibility as in C, C++, or Fortran. #HPC arxiv.org/pdf/2411.14887

👀 github.com/geerlingguy/...

I'm launching the hashtag #HPCTales to share ridiculous articles about #HPC. I'm starting with news from a French defense (!!) website that headlines: "The 2nd most powerful supercomputer in the world (Frontier) is now able to create its own Matrix-like universe thanks to Exascale" 🤦

#Intel projects after 2024 v23

64th #Top500 is out! o #ElCapitan at LLNL is the new #1 o We now have 3 #Exascale systems officially o #HPC6 at Eni is new at #5 o Tuolumne, a smaller version of #ElCapitan, rounds up the #Top10 top500.org/news/el-capi... #HPC #AI #SC24

Mandatory things to ask my #Microsoft #Azure colleagues at #SC24 : “I’m having a problem with <obscure-hardware-driver> on my Windows laptop - can you fix it?” 💻 “Got any free Xboxes?” 🎮 “When will you rename Copilot to Clippy 2.0?” 🤖 #we-also-do #HPC 🤦 ❤️🚀

First cut of an #SIMD/ #ASM starter pack! I’ve definitely missed folks, please let me know if you want to be added to the list! go.bsky.app/7iKAaSv