Sign in

Marc Joos

@marcjoos.bsky.social
116 followers 277 following 98 posts

Studied borning stars (astro PhD), worked on big computers (HPC @CEA). Solutions architect @NVIDIA. Ally (gender equality supporter). Free software enthusiast. Listen to music (loud & dissonant). Guitar player. Born @347ppm. En/Fr. He/him. Views are my own

PostsRepliesMedia
Marc Joos @marcjoos.bsky.social · 26/08/2026
Je rejoins d'autres commentaires qui disent que la liste est un peu vieillotte et assez franco-française ; rien qu'en SF, des choses beaucoup plus excitantes sont sorties au 20e siècle des deux côtés de l'Atlantique.
010
Marc Joos @marcjoos.bsky.social · 26/08/2026
Entre 25 et 30, parce que j'ai lu certains auteurs de la liste sans être sûr d'avoir lu cet ouvrage là en particulier. Toute la SF et toutes les BD de la liste. 100 ans de solitude m'a marqué (par contre il faut le lire d'une traite pour ne pas se perdre dans les personnages).
100
Reposted by Marc Joos
Ann Leckie @annleckie.com · 20/08/2026
Also? Social media is real life. If you're being an ass on the internets but nice at home, you are still being an ass. This especially goes for "but they're only doing it as a public persona!" My sibling in Mithras, whatever you're willing to do for your persona is SOMETHING YOU'RE WILLING TO DO.
151144215
Reposted by Marc Joos
High Performance Software Foundation (HPSF) @hpsf.bsky.social · 28/07/2026
Save the date for HPSF Conference 2027! #HPSFCon will take place April 12-16, 2027 in Montreal, Canada
045
Reposted by Marc Joos
Physghoul 👻 🎃 @physgal.bsky.social · 28/07/2026
Fascinating paper on the progression of women in academia. 👩🏻‍🔬 ⚛️ 🧪 #AcademicSky docs.iza.org/dp18477.pdf?... Here's an excerpt from the conclusion:
When women do obtain tenure, the effects extend well beyond their own careers. Beyond the direct promotion of the qualifying candidate, departments experience on average one additional female promotion over the subsequent fifteen years, a substantial expansion of the female PhD pipeline, and improved retention and career progression among female doctoral graduates. These effects are concentrated in departments where women are underrepresented, but not entirely absent, suggesting that a minimal female presence is a precondition for trickle-down effects to materialize, whether through mutual support, departmental influence, or other channels that require women not to be entirely isolated.
010852
Marc Joos @marcjoos.bsky.social · 16/07/2026
USB sticks are the first real quantum devices broadly available. In the two first attempts, they are in a superposition of states and thus cannot (and can) be connected. You need to observe it for their wave function to collapse and then it's possible to connect them.
020
Marc Joos @marcjoos.bsky.social · 23/06/2026
I'm very excited to announce that Wi4MPI joined the HPSF! The project will now benefit from the valuable support of the foundation to continue growing! We're also launching a new website for the project: wi4mpi.io hpsf.io/blog/2026/hi...
hpsf.io
High Performance Software Foundation Welcomes Wi4MPI as a New Project – High Performance Software Foundation (HPSF)
000
Reposted by Marc Joos
High Performance Software Foundation (HPSF) @hpsf.bsky.social · 23/06/2026
We’re excited to welcome Wi4MPI to the High Performance Software Foundation. Wi4MPI helps applications run across MPI implementations without recompilation, making HPC workflows more portable and flexible. A strong addition to the open HPC ecosystem. bit.ly/44oeBvL
053
Reposted by Marc Joos
Torsten Hoefler 🇨🇭 @thoefler.bsky.social · 22/06/2026
As #ISC26 is coming up, I wrote down thoughts on the central metric in our #HPC and #AI community: flop/s. A flop is a count; flop/s is a rate. FLOPS is yelling, flops is confusing, and “TFLOPS” is how unit symbols go to therapy. HPC deserves better. buff.ly/LpWDYBU Enjoy & see you in Hamburg!
buff.ly
Stop Saying FLOPS: A Tiny Rant About a Very Real Unit Problem | Torsten Hoefler's blog
Jun202026
2114
Marc Joos @marcjoos.bsky.social · 09/05/2026
La dynamique de blocage sur BS est intéressante, je me suis retrouvé dans des blacklists pour avoir suivi quelqu'un qui a balancé un truc problématique sans que je m'en rende compte (parce que pas constamment sur la plateforme). Le positif est que la culture du clash est moins forte qu'ailleurs
010
Marc Joos @marcjoos.bsky.social · 04/03/2026
Angela Davis, bell hooks qui incarnent la convergence des luttes. Safiya Noble, dans la même veine mais avec la tech en plus. Sara Marcus ou Manon Labry, dans un registre plus bruyant, qui ont été actrices du mouvement qu'elles étudient et qu'elles ont chroniqué (les riot grrrls)
000
Marc Joos @marcjoos.bsky.social · 01/02/2026
If you'vee ever spent some time installing packages, you have to check this talk! You'll definitely laugh, and maybe cry a little remembering the days spent installing (or at least trying) your most dreaded piece of software. I've spent 15+ years doing that, I can tell you everything is true
022
Reposted by Marc Joos
Kenneth Hoste (boegel) @boegel.bsky.social · 01/02/2026
The recording of my "How to Make Package Managers Scream" talk at FOSDEM'26 is now available, enjoy! youtu.be/PBlDHlFnzGo
youtu.be
How to Make Package Managers Scream @ FOSDEM'26 - Kenneth Hoste
YouTube video by Kenneth Hoste
0197
Marc Joos @marcjoos.bsky.social · 04/01/2026
J'avais accompagné un voyage en NZ par la lecture Keri Hulme, The Bone People. Pas mal de termes maori non-traduits et de Kiwi slang, ce qui participe à la richesse du livre — mais ce n'est pas le plus difficile, étant donnés les thèmes abordés en.wikipedia.org/wiki/The_Bon...
en.wikipedia.org
The Bone People - Wikipedia
010
Reposted by Marc Joos
CZEdwards @czedwards.bsky.social · 24/12/2025
I see there’s a post about microplastics going around with a photo of drinking straws, so here is my semi-regular reminder that the 3 biggest sources of microplastics are tires (45%), synthetic clothing particles (35%) and paint (~10%). Lay article attached:
pbs.org
One of the biggest microplastic pollution sources isn’t straws or grocery bags – it’s your tires
Every few years, the tires on your car wear thin and need to be replaced. But where does that lost tire material go? The answer, unfortunately, is often waterways, where the tiny microplastic particle...
2424481139
Marc Joos @marcjoos.bsky.social · 24/12/2025
I'm sure someone is gonna write a wrapper!
010
Marc Joos @marcjoos.bsky.social · 21/12/2025
Going to be there, as I have been for the past few years!
010
Reposted by Marc Joos
Kenneth Hoste (boegel) @boegel.bsky.social · 20/12/2025
Schedule for #HPC, Big Data, and Data Science devroom at FOSDEM'26 (on Sun 1 Feb 2026, in Brussels) has been published: fosdem.org/2026/schedul...
fosdem.org
FOSDEM 2026 - HPC, Big Data & Data Science
0139
Reposted by Marc Joos
Kenneth Hoste (boegel) @boegel.bsky.social · 22/11/2025
Tik tok, the clock is ticking… Only 10 more days left to submit your talk proposal for the #HPC, Big Data, and Data Science devroom at #FOSDEM’26 ! hpc-bigdata-fosdem26.github.io Same goes for pretty much all of the other devrooms BTW… See fosdem.org/2026/schedul...
hpc-bigdata-fosdem26.github.io
FOSDEM'26 HPC, Big Data, and Data Science Devroom
FOSDEM'26 HPC, Big Data, and Data Science Devroom
056
Reposted by Marc Joos
Katie Mack @astrokatie.com · 19/11/2025
Just want to emphasize here that this is an image of an INTERSTELLAR COMET taken by a camera orbiting MARS. Space is so cool!
141107215
Marc Joos @marcjoos.bsky.social · 18/11/2025
Great interview of Ian Buck on NVIDIA's vision on the future of HPC. Few important messages: "AI is a tool, one of many tools to be able to do scientific discovery" "FP64 is a requirement" "It has to be great at simulation; it has to be great at AI; and it also has to be a quantum supercomputer"
010
Reposted by Marc Joos
Kenneth Hoste (boegel) @boegel.bsky.social · 05/11/2025
By annual tradition, the HPC, Big Data, and Data Science devroom will be part of FOSDEM again next year (Sat-Sun 31 Jan + 1 Feb 2026 in Brussels). \o/ Please help us spread the word, and/or submit a talk proposal by 1 Dec 2025. All details available via hpc-bigdata-fosdem26.github.io 🍻
hpc-bigdata-fosdem26.github.io
FOSDEM'26 HPC, Big Data, and Data Science Devroom
FOSDEM'26 HPC, Big Data, and Data Science Devroom
085
Reposted by Marc Joos
Alan Sill @alansill.mast.hpc.social.ap.brid.gy · 12/11/2025
Deadline for submissions for the 11th #HPC, #BigData, and #DataScience devroom at #FOSDEM26 (Brussels, Sat-Sun 31 Jan + 1 Feb 2026) is Mon 1 Dec 2025. Please see details at the link below. Looking forward to another dynamic, exciting, packed session! hpc-bigdata-fosdem26.github.io
hpc-bigdata-fosdem26.github.io
FOSDEM'26 HPC, Big Data, and Data Science Devroom
FOSDEM'26 HPC, Big Data, and Data Science Devroom
146
Reposted by Marc Joos
Robert "The Bobby Yaga" McNees @mcnees.bsky.social · 31/10/2025
Mathematician Karl Weierstrass was born #OTD, Halloween, in 1815. 🧪 🎃 The fools at The Academy all said he was mad, but he showed them all in 1872 when he announced that he had created a MONSTER. Let's learn about the terrible thing he did. Image: Smithsonian Institution Libraries
Black and white photo of Karl Weierstrass in his later years. His white hair is receding, longer in the back, and he is wearing a dark suit with a white collared shirt underneath.
510743
Marc Joos @marcjoos.bsky.social · 29/10/2025
The said hair product is probably Pedro L'Âne
010
Marc Joos @marcjoos.bsky.social · 11/10/2025
Already have my train tickets and hotel booked, very much hope that the HPC devroom will be there!
010
Marc Joos @marcjoos.bsky.social · 05/10/2025
For some time there was the argument that Linux was no good for gaming, but in the past few years I heard more and more good things about gaming on Linux so it's not anymore an argument.
000
Marc Joos @marcjoos.bsky.social · 05/10/2025
To add some weight for Linux: most of the open source software is more than good enough (LibreOffice, Gimp, Inkscape, VLC...) and for personal use I've never needed anything more.
110
Marc Joos @marcjoos.bsky.social · 04/10/2025
Linux is obviously a good choice, it's lightweight, it mostly just works, you have full control of your computer and even for non technical stuff, it's much easier to do things in bash than with a GUI (a good example is changing metadata from thousands of pictures)
100
Marc Joos @marcjoos.bsky.social · 04/10/2025
From the little experience I have with Mac I find them frustrating because it looks like Linux but it's not with slight differences that makes you bang your head against the wall sometimes. Probably less frustrating for *BSD users though. Oh and the Mac keyboard is very confusing to me too.
020
Marc Joos @marcjoos.bsky.social · 04/10/2025
Only Linux for the past 18 years (work and personal use), mostly Dell and ThinkPad. No real issues apart from the occasional driver problem on Dell. On the long run ThinkPads are a bit more solid, but Dell are pretty good (the non pro versions less so). Don't like the ThinkPad keyboard so much.
120
Marc Joos @marcjoos.bsky.social · 20/09/2025
I was writing exactly the same; there's an "infrastructure" side of putting up such a cluster that is not visible with a laptop. If you are an end-user, a couple of containers is great. If you want to understand how a cluster works with its constraints, then a RPi cluster is great.
000
Marc Joos @marcjoos.bsky.social · 20/09/2025
There's value in doing so for educational purposes though, ICHEC has a little cluster they displayed at events like ISC, and I remember a talk at FOSDEM (archive.fosdem.org/2020/schedul...) about it.
archive.fosdem.org
110
Marc Joos @marcjoos.bsky.social · 08/08/2025
Having the flops doesn't mean you can use them with your code. Using them doesn't mean your algo & science is solid. Using them w/ solid algo/physics doesn't mean you can efficiently analyze the data. Analyzing the data doesn't mean you have a profound understanding of the problem you study...
000
Marc Joos @marcjoos.bsky.social · 06/08/2025
And there are already real-life examples where the efficiency of AI exceeds by far the classical approach one, for both power and accuracy. One of my favourite examples for the past couple of years has been FourCastNet (docs.nvidia.com/deeplearning...); this kind of achievement is amazing
docs.nvidia.com
FourCastNet
000
Reposted by Marc Joos
Spack @spackpm.bsky.social · 20/07/2025
💥Spack v1.0 is out!💥 This is a huge milestone. We reworked the core to add compiler dependencies, and we're introducing a stable package API. 🚀1.0 also adds concurrent builds, better includes, and much more -- read it all in the release notes! github.com/spack/spack/...
github.com
04016
Marc Joos @marcjoos.bsky.social · 21/06/2025
It's not that surprising as -- at least in Europe -- lots of AI factories are actually pre-exascale and exascale EuroHPC systems.
010
Reposted by Marc Joos
Addison Snell @addisonsnell.bsky.social · 06/06/2025
"HPC Finally Found Its Killer App -- Can It Survive?" My views in HPCwire. #HPC #AI www.hpcwire.com/2025/06/06/h...
hpcwire.com
HPC Finally Found Its Killer App – Can It Survive?
Where We Are: On June 3, Intersect360 Research released our most recent market numbers for the HPC market. At the top level, things look great. We found a 24.1% growth […]
041
Reposted by Marc Joos
EUPEX project @eupex-project.bsky.social · 03/06/2025
🚨 Last call! Our next EUPEX webinar is tomorrow! Join Aurélien Cedeyn (CEA) as he presents OCEAN, the admin software stack used in production for HPC cluster management. 📅 June 4, 11 AM CEST 🔗 Register: us06web.zoom.us/meeting/regi... #HPC #Webinar
031
Reposted by Marc Joos
Crazy Eddie's Used Computers @dectape.bsky.social · 02/04/2025
I worked at the Living Computer Museum from 2014 until it closed due to Covid (and then never reopened because Paul Allen did a shitty job with his estate planning.) It's been a bit over 5 years since the museum closed to the public and I thought I'd share some pictures I took around that time.
11399
Marc Joos @marcjoos.bsky.social · 05/05/2025
And being maybe too optimistic and excited about the future, I'd like to gamble on quantum computing. But more realistically that might be the next-next 10x 😁
000
Marc Joos @marcjoos.bsky.social · 05/05/2025
Focusing on raw performance of apps, I'd go for AI impact: there is a tremendous potential with PINNs and the likes, and the way it revolutionised weather forecasts for example is just the beginning. And there's also more than promising things with accurate subgrid modeling with AI.
100
Marc Joos @marcjoos.bsky.social · 05/05/2025
I'd go with better usability, because if you build big systems but don't care about services you provide for the users to make the best of it, you've lost. It's kind of the human factor in the equation. Incidentally, I/O & SW stack have an impact on usability.
100
Marc Joos @marcjoos.bsky.social · 02/05/2025
BlueSky: Attack of the Clones The one with Jango Fett was more entertaining!
The same post skeeted twice by two different users who are suspiciously similar
010
Marc Joos @marcjoos.bsky.social · 28/04/2025
Quite some work was done on the doc to ease the use of the library and broaden its user base. You want to run containers at scale with no hassle? You have a legacy code & want to switch MPI? You want to debug or assess perf easily? Wi4MPI might be for you! wi4mpi.readthedocs.io/en/latest/us...
wi4mpi.readthedocs.io
Introduction — Wi4MPI documentation
000
Marc Joos @marcjoos.bsky.social · 28/04/2025
Today we released the latest version of #Wi4MPI that includes major changes, in particular in the internals of the library. It doesn't change much for the users but it has a huge impact on the flexibility, versatility and robustness of the library. github.com/cea-hpc/wi4mpi #HPC #MPI
github.com
GitHub - cea-hpc/wi4mpi: Wrapper interface for MPI
Wrapper interface for MPI. Contribute to cea-hpc/wi4mpi development by creating an account on GitHub.
150
Marc Joos @marcjoos.bsky.social · 17/04/2025
No hassle & runs everywhere? gfortran GPU and/or easy profiling for free? nvfortran Performance on x86? (used to be) ifort Life has no meaning anymore? ifx Useful listings for code analysis? xlf I still have to try flang (ex flang-new) to have a definitive opinion about it!
151
Marc Joos @marcjoos.bsky.social · 12/04/2025
Le @cea.fr fait ça avec ses supercalculateurs depuis quelques temps déjà (et il faut aussi noter que l'efficacité énergétique des supercalculateurs (mesurée avec le PUE, combien de Watt faut-il pour un Watt de calcul) est meilleur que pour les data centers classiques) www.cea.fr/Documents/in...
cea.fr
010
Marc Joos @marcjoos.bsky.social · 12/04/2025
Ce projet existe depuis un moment et il est toujours là, c'est la société Qarnot qui fait ça : qarnot.com/fr
qarnot.com
Qarnot - Qarnot
More IT, less energy, less carbon
131
Reposted by Marc Joos
EUPEX project @eupex-project.bsky.social · 08/04/2025
🚨 Last call! Our next EUPEX webinar is tomorrow! Join Aurélien Cedeyn (CEA) as he presents OCEAN, the admin software stack used in production for HPC cluster management. 📅 April 9, 11 AM CEST 🔗 Register: us06web.zoom.us/meeting/regi... #HPC #Webinar
021