Sylvain Wallez
@swallez.com
Software engineer, from big servers to tiny microcontrollers. Member of @apache.org, working at @rerun.io, ex-Elastic. Blogging (sometimes) at https://bluxte.net
🌐 Toulouse, France, Europe
🌐 Toulouse, France, Europe
Thoughtful and balanced essay on the use of LLMs for all kinds of tasks. Key takeaway: LLMs are useful but humans must take responsibility for their output.
I have put together a (long overdue!) draft RFD on using LLMs at @oxide.computer, but I know that there is a ton more to be said on the topic; thoughts and experiences welcome!
rfd.shared.oxide.computer/rfd/0576
rfd.shared.oxide.computer/rfd/0576
576 - Using LLMs at Oxide / RFD / Oxide
rfd.shared.oxide.computer
December 7, 2025 at 9:51 AM
Thoughtful and balanced essay on the use of LLMs for all kinds of tasks. Key takeaway: LLMs are useful but humans must take responsibility for their output.
Dear software publishers offering light and dark modes. If you offer an option to select the system mode, USE IT BY DEFAULT, and don't require users to find it in the preferences. Today I'm looking at you @jetbrains.com (but I still love you).
December 7, 2025 at 7:34 AM
Dear software publishers offering light and dark modes. If you offer an option to select the system mode, USE IT BY DEFAULT, and don't require users to find it in the preferences. Today I'm looking at you @jetbrains.com (but I still love you).
Datadog standardizing around DataFusion and Substrait, an abstract representation of relational algebra: "Substrait breaks the language from the execution engine. It doesn't matter whether it's SQL or our Elasticsearch-like query language. And it's extremely extensible."
Apache DataFusion Boston Meetup: September 12, 2025
YouTube video by Andrew Lamb
www.youtube.com
December 6, 2025 at 3:02 PM
Datadog standardizing around DataFusion and Substrait, an abstract representation of relational algebra: "Substrait breaks the language from the execution engine. It doesn't matter whether it's SQL or our Elasticsearch-like query language. And it's extremely extensible."
I was in the 500 first committers of the ASF about 25 years ago. Time flies!
The ASF has reached 10,000 committers! Every committer plays a role in building software for the public good.
This milestone also showcases the power of our global community and the Apache Way.
Huge thanks to all who contribute! buff.ly/Zoua7Zg
#CommunityOverCode #opensource
This milestone also showcases the power of our global community and the Apache Way.
Huge thanks to all who contribute! buff.ly/Zoua7Zg
#CommunityOverCode #opensource
December 5, 2025 at 8:08 PM
I was in the 500 first committers of the ASF about 25 years ago. Time flies!
Reposted by Sylvain Wallez
Someone is rewriting the OTEL Collector in Rust, and honestly it’s exciting to watch. The Arrow ecosystem, otel-arrow in particular, is slowly taking over the OTEL tooling, one crate at a time www.youtube.com/watch?v=xeQn...
Introducing a Lightweight Rust OpenTelemetry Collector - Mike Heffner & Ray Jenkins, Streamfold
YouTube video by CNCF [Cloud Native Computing Foundation]
www.youtube.com
December 5, 2025 at 6:24 PM
Someone is rewriting the OTEL Collector in Rust, and honestly it’s exciting to watch. The Arrow ecosystem, otel-arrow in particular, is slowly taking over the OTEL tooling, one crate at a time www.youtube.com/watch?v=xeQn...
Unsung benefit of using #RustLang: the compiler forbids so many mistakes that crappy code is likely to work with a decent level of stability and reliability.
December 5, 2025 at 3:11 PM
Unsung benefit of using #RustLang: the compiler forbids so many mistakes that crappy code is likely to work with a decent level of stability and reliability.
This may in part explain why France is particularly targeted by cyberattacks and disinformation: "In few years, both France and the UK — the only European nuclear weapon states — may be simultaneously under control of populist far right parties that are at best skeptical of European solidarity."
The new US #NationalSecurityStrategy is so alarming that I spent hours today on this piece, rather than my real work.
We the Europeans, and especially the #NB8 countries in #NATO 's Eastern Flank, MUST prepare to defend our #democracy and deter #Russia by ourselves.
jmkorhonen.net/2025/12/05/w...
We the Europeans, and especially the #NB8 countries in #NATO 's Eastern Flank, MUST prepare to defend our #democracy and deter #Russia by ourselves.
jmkorhonen.net/2025/12/05/w...
When the umbrella starts to leak: Securing NATO’s Eastern Flank after the new U.S. security strategy
The new U.S. National Security Strategy shifts the United States to an unreliable ally at best – an active threat at worst. Europe and in particular NB8 countries on NATO’s Eastern Flan…
jmkorhonen.net
December 5, 2025 at 2:21 PM
This may in part explain why France is particularly targeted by cyberattacks and disinformation: "In few years, both France and the UK — the only European nuclear weapon states — may be simultaneously under control of populist far right parties that are at best skeptical of European solidarity."
Je suis un p'tit jeune en fait 😛
December 5, 2025 at 9:30 AM
Je suis un p'tit jeune en fait 😛
Pretty impressive vector indexing improvements in Elasticsearch by leveraging GPUs! (via @benwtrent.bsky.social) www.elastic.co/search-labs/...
Elasticsearch GPU: vector indexing acceleration with NVIDIA - Elasticsearch Labs
Discover how Elasticsearch achieves nearly 12x higher indexing throughput with GPU-accelerated vector indexing and NVIDIA cuVS.
www.elastic.co
December 5, 2025 at 9:13 AM
Pretty impressive vector indexing improvements in Elasticsearch by leveraging GPUs! (via @benwtrent.bsky.social) www.elastic.co/search-labs/...
Looks like a number of people don't know the "cowboy coding" expression, even if they immediately grasp its meaning. There's actually a Wikipedia page for it! en.wikipedia.org/wiki/Cowboy_...
Cowboy coding - Wikipedia
en.wikipedia.org
December 4, 2025 at 2:46 PM
Looks like a number of people don't know the "cowboy coding" expression, even if they immediately grasp its meaning. There's actually a Wikipedia page for it! en.wikipedia.org/wiki/Cowboy_...
Reposted by Sylvain Wallez
If you believe in home devices that respect privacy, give you freedom and still play nice together, then you should probably read this. https://github.blog/open-source/maintainers/the-local-first-rebellion-how-home-assistant-became-the-most-important-project-in-your-house/
“The local-first rebellion”: How Home Assistant became the most important project in your house
Learn how one of GitHub's fastest-growing open source projects is redefining smart homes without the cloud.
github.blog
December 4, 2025 at 12:40 AM
If you believe in home devices that respect privacy, give you freedom and still play nice together, then you should probably read this. https://github.blog/open-source/maintainers/the-local-first-rebellion-how-home-assistant-became-the-most-important-project-in-your-house/
Personal data leaks will soon include pictures of people's butt and poop 😅 techcrunch.com/2025/12/03/e...
‘End-to-end encrypted’ smart toilet camera is not actually end-to-end encrypted | TechCrunch
Kohler, the makers of a smart toilet camera, can access customers' data stored on its servers, and can use customers’ bowl pictures to train AI.
techcrunch.com
December 4, 2025 at 9:08 AM
Personal data leaks will soon include pictures of people's butt and poop 😅 techcrunch.com/2025/12/03/e...
Reposted by Sylvain Wallez
New post: a defense of lock poisoning in Rust.
Followup to recent discussion: decided to write about lock poisoning, looking at the arguments on each side, and informed by our experience at @oxide.computer dealing with the parallel problem of unexpected async cancellations
Please give it a read!
Followup to recent discussion: decided to write about lock poisoning, looking at the arguments on each side, and informed by our experience at @oxide.computer dealing with the parallel problem of unexpected async cancellations
Please give it a read!
In defense of lock poisoning in Rust · sunshowers
It's worth retaining one of multithreaded Rust's most valuable features.
sunshowers.io
December 2, 2025 at 7:37 PM
New post: a defense of lock poisoning in Rust.
Followup to recent discussion: decided to write about lock poisoning, looking at the arguments on each side, and informed by our experience at @oxide.computer dealing with the parallel problem of unexpected async cancellations
Please give it a read!
Followup to recent discussion: decided to write about lock poisoning, looking at the arguments on each side, and informed by our experience at @oxide.computer dealing with the parallel problem of unexpected async cancellations
Please give it a read!
Reposted by Sylvain Wallez
December 3, 2025 at 4:06 AM
Reposted by Sylvain Wallez
this fall I worked with the core Git folks on writing an official data model for Git and it just got merged! I learned a few new things from writing it. github.com/git/git/blob...
git/Documentation/gitdatamodel.adoc at master · git/git
Git Source Code Mirror - This is a publish-only repository but pull requests can be turned into patches to the mailing list via GitGitGadget (https://gitgitgadget.github.io/). Please follow Documen...
github.com
December 2, 2025 at 5:01 PM
this fall I worked with the core Git folks on writing an official data model for Git and it just got merged! I learned a few new things from writing it. github.com/git/git/blob...
Je relis "De la terre à la lune" de Jules Vernes. Dans le 1er chapitre on lit "𝐿𝑒 𝑐𝑎𝑛𝑜𝑛 𝑅𝑜𝑑𝑚𝑎𝑛, 𝑞𝑢𝑖 𝑝𝑜𝑟𝑡𝑎𝑖𝑡 à 𝑠𝑒𝑝𝑡 𝑚𝑖𝑙𝑙𝑒𝑠" avec une note : "𝐿𝑒 𝑚𝑖𝑙𝑙𝑒 𝑣𝑎𝑢𝑡 1609 𝑚è𝑡𝑟𝑒𝑠 31 𝑐𝑒𝑛𝑡𝑖𝑚è𝑡𝑟𝑒𝑠. 𝐶𝑒𝑙𝑎 𝑓𝑎𝑖𝑡 𝑑𝑜𝑛𝑐 𝑝𝑟è𝑠 𝑑𝑒 𝑡𝑟𝑜𝑖𝑠 𝑙𝑖𝑒𝑢𝑒𝑠". En 1868 le système métrique n'était pas encore totalement dans les mœurs 😅
De la Terre à la Lune/Texte entier - Wikisource
fr.wikisource.org
December 2, 2025 at 5:04 PM
Je relis "De la terre à la lune" de Jules Vernes. Dans le 1er chapitre on lit "𝐿𝑒 𝑐𝑎𝑛𝑜𝑛 𝑅𝑜𝑑𝑚𝑎𝑛, 𝑞𝑢𝑖 𝑝𝑜𝑟𝑡𝑎𝑖𝑡 à 𝑠𝑒𝑝𝑡 𝑚𝑖𝑙𝑙𝑒𝑠" avec une note : "𝐿𝑒 𝑚𝑖𝑙𝑙𝑒 𝑣𝑎𝑢𝑡 1609 𝑚è𝑡𝑟𝑒𝑠 31 𝑐𝑒𝑛𝑡𝑖𝑚è𝑡𝑟𝑒𝑠. 𝐶𝑒𝑙𝑎 𝑓𝑎𝑖𝑡 𝑑𝑜𝑛𝑐 𝑝𝑟è𝑠 𝑑𝑒 𝑡𝑟𝑜𝑖𝑠 𝑙𝑖𝑒𝑢𝑒𝑠". En 1868 le système métrique n'était pas encore totalement dans les mœurs 😅
Conventional comments: this is the approach I use in my review comments to express their importance, and I didn't know it had been formalized. This is a good habit to have for effective and constructive reviews (via @k33gorg.bsky.social) conventionalcomments.org
Conventional Comments
Comments that are easy to grok and grep
conventionalcomments.org
December 2, 2025 at 7:44 AM
Conventional comments: this is the approach I use in my review comments to express their importance, and I didn't know it had been formalized. This is a good habit to have for effective and constructive reviews (via @k33gorg.bsky.social) conventionalcomments.org
Reposted by Sylvain Wallez
🎯 Dernier épisode de ma série "Oups, j'ai vibe codé une CLI" !
Comment passer du chaos du vibe coding à une méthode industrialisée avec Speckit ?
Le développeur devient Product Owner, Architecte et Reviewer.
👉 david.drugeon-hamon.bzh/blog/2025/11/vibe-coder-cli-part3/
#VibeCoding #ClaudeCode
Comment passer du chaos du vibe coding à une méthode industrialisée avec Speckit ?
Le développeur devient Product Owner, Architecte et Reviewer.
👉 david.drugeon-hamon.bzh/blog/2025/11/vibe-coder-cli-part3/
#VibeCoding #ClaudeCode
Oups, j'ai vibe codé une CLI (3/3) : Vibe coding avec Speckit
Comment utiliser Speckit pour structurer le vibe coding ? Retour d'expérience sur le workflow spec-driven avec Claude Code, de la spécification à l'implémentation.
david.drugeon-hamon.bzh
November 29, 2025 at 7:55 AM
🎯 Dernier épisode de ma série "Oups, j'ai vibe codé une CLI" !
Comment passer du chaos du vibe coding à une méthode industrialisée avec Speckit ?
Le développeur devient Product Owner, Architecte et Reviewer.
👉 david.drugeon-hamon.bzh/blog/2025/11/vibe-coder-cli-part3/
#VibeCoding #ClaudeCode
Comment passer du chaos du vibe coding à une méthode industrialisée avec Speckit ?
Le développeur devient Product Owner, Architecte et Reviewer.
👉 david.drugeon-hamon.bzh/blog/2025/11/vibe-coder-cli-part3/
#VibeCoding #ClaudeCode
Reposted by Sylvain Wallez
Chat control fight - round two.
reclaimthenet.org/eu-council-a...
This feels like we are fighting on two fronts at the same time. The blue/brown crowd and the ones that make it hard to argue for the EU.
The road to hell is paved with good intentions.
fightchatcontrol.eu
reclaimthenet.org/eu-council-a...
This feels like we are fighting on two fronts at the same time. The blue/brown crowd and the ones that make it hard to argue for the EU.
The road to hell is paved with good intentions.
fightchatcontrol.eu
EU Council Approves New “Chat Control” Mandate Pushing Mass Surveillance
By disguising coercion as consent, the EU’s plan enlists tech companies as willing agents in its quiet expansion of digital surveillance.
reclaimthenet.org
November 28, 2025 at 9:26 PM
Chat control fight - round two.
reclaimthenet.org/eu-council-a...
This feels like we are fighting on two fronts at the same time. The blue/brown crowd and the ones that make it hard to argue for the EU.
The road to hell is paved with good intentions.
fightchatcontrol.eu
reclaimthenet.org/eu-council-a...
This feels like we are fighting on two fronts at the same time. The blue/brown crowd and the ones that make it hard to argue for the EU.
The road to hell is paved with good intentions.
fightchatcontrol.eu
Internet speed in the plane: 300 mbps down, 50 mbps up 😮 (Air France - AMS-TLS flight)
November 28, 2025 at 8:09 PM
Internet speed in the plane: 300 mbps down, 50 mbps up 😮 (Air France - AMS-TLS flight)
Reposted by Sylvain Wallez
![Comic. Panels up to the 10-year point are grayed out. New panels since the Ten Years comic, which chronicles the first ten years of PERSON 1's journey with cancer: (1) [two people in bed] PERSON 1 (woman): One more chapter? PERSON 2 (man): Don’t we both have to get up early? PERSON 1: Nnnnnggggh PERSON 2: Sure, good point. (2) [many people wearing masks, walking while looking at graphs on their phones] (3) [birds landing on people] PERSON 2 in beanie and scarf: Hah! They like *my* seeds best. PERSON 1 in scarf holding phone with a bird sitting on it: Wait, how do I take a picture of this one? (4) [two people rowing boats with tree landscape] (5) [Person 1 carries overflowing stack of things to Person 2 in bed] PERSON 1: I brought you honey lemon tea, more pillows, a cinnamon roll, Tylenol, another blanket, a– PERSON 2: It was just Appendicitis, I’m really– PERSON 1: *It is my turn to take care of you and I am going to do it right!* (6) [Two people in car] (7) [still in car) PERSON 1: Oh my god. PERSON 2: Oh my god. (8) [car driving] PERSON 1: Pull over! PERSON 2: I am! (9) [both people get out of car] (10) [Large colored panel of aurora borealis over water with both people looking on] (11) [Person 1 sits against tree while Person 2 lies on the ground] PERSON 1: Fifteen years. No sign of the cancer. (12) I *am* having some weird symptoms. Joint pain. Fatigue. I think I’m losing my close-up vision. PERSON 2: Yeah. Me too. (13) PERSON 2: I think we’re getting old. (14) PERSON 1: I guess that’s okay. PERSON 2: It’s all I wanted.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:cz73r7iyiqn26upot4jtjdhk/bafkreihwhjblp5lyiwp63ouar7ocfea7evmckytoeo7rkfuoo4gw5rnrra@jpeg)
November 26, 2025 at 10:32 PM
Current status: stuck in the plane from Stockholm to Amsterdam for 2:30 hours. Computer problem, they said. They tried to reset it to no avail, and have to replace parts…
November 28, 2025 at 1:04 PM
Current status: stuck in the plane from Stockholm to Amsterdam for 2:30 hours. Computer problem, they said. They tried to reset it to no avail, and have to replace parts…
Nano Banana Pro is really impressive. But this triggers so many questions about having a job as an artist and the consequences on the evolution of artistic styles that may dry up if creative people cannot make a living out of their art… dev.to/googleai/nan...
Nano-Banana Pro: Prompting Guide & Strategies
Nano-Banana Pro: Prompting Guide & Strategies Nano-Banana Pro is a significant leap...
dev.to
November 28, 2025 at 7:43 AM
Nano Banana Pro is really impressive. But this triggers so many questions about having a job as an artist and the consequences on the evolution of artistic styles that may dry up if creative people cannot make a living out of their art… dev.to/googleai/nan...
TIL: the `.git/info/exclude` file is like `.gitignore`, but not versioned. Quite convenient for files that are specific to your environment, workflow or tooling, and you don't want to share. git-scm.com/docs/gitignore
Git - gitignore Documentation
git-scm.com
November 27, 2025 at 4:27 PM
TIL: the `.git/info/exclude` file is like `.gitignore`, but not versioned. Quite convenient for files that are specific to your environment, workflow or tooling, and you don't want to share. git-scm.com/docs/gitignore
C'est dingue comme elle est bien cette chanson ! Les paroles sont vraiment top et l'interprétation par Suno m'a bluffé !
Un de mes collègues a créé ça sur suno aujourd'hui, et le résultat est assez bluffant ! J'adore ! 😅
suno.com/s/tErMBg4uq9...
suno.com/s/tErMBg4uq9...
(Intro - sample jazzy)
Listen and make your own on Suno.
suno.com
November 25, 2025 at 9:54 PM
C'est dingue comme elle est bien cette chanson ! Les paroles sont vraiment top et l'interprétation par Suno m'a bluffé !