Marc Joos
@marcjoos.bsky.social
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
Pinned
Marc Joos
@marcjoos.bsky.social
· Apr 28
GitHub - cea-hpc/wi4mpi: Wrapper interface for MPI
Wrapper interface for MPI. Contribute to cea-hpc/wi4mpi development by creating an account on GitHub.
github.com
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/cea-hpc/wi4mpi
#HPC #MPI
Reposted by Marc Joos
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:
Lay article attached:
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...
www.pbs.org
December 24, 2025 at 4:49 AM
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:
Lay article attached:
Going to be there, as I have been for the past few years!
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 2026 - HPC, Big Data & Data Science
fosdem.org
December 21, 2025 at 10:37 PM
Going to be there, as I have been for the past few years!
Reposted by Marc Joos
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 2026 - HPC, Big Data & Data Science
fosdem.org
December 20, 2025 at 6:06 PM
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...
Reposted by Marc Joos
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...
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...
FOSDEM'26 HPC, Big Data, and Data Science Devroom
FOSDEM'26 HPC, Big Data, and Data Science Devroom
hpc-bigdata-fosdem26.github.io
November 22, 2025 at 10:27 AM
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...
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...
Reposted by Marc Joos
Just want to emphasize here that this is an image of an INTERSTELLAR COMET taken by a camera orbiting MARS. Space is so cool!
NASA's pix of the interstellar comet 3I/ATLAS are now up science.nasa.gov/solar-system...
This is the HiRISE/MRO image ⬇️
This is the HiRISE/MRO image ⬇️
November 19, 2025 at 8:30 PM
Just want to emphasize here that this is an image of an INTERSTELLAR COMET taken by a camera orbiting MARS. Space is so cool!
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"
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"
The future of supercomputing will be AI accelerated • The Register share.google/7ImYZdHWRsOf...
The future of supercomputing will be AI accelerated
Interview: Nvidia's Ian Buck on the importance of FP64 to power research, in a world that's hot for inferencing
share.google
November 18, 2025 at 9:30 PM
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"
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"
Reposted by Marc Joos
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 🍻
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 🍻
FOSDEM'26 HPC, Big Data, and Data Science Devroom
FOSDEM'26 HPC, Big Data, and Data Science Devroom
hpc-bigdata-fosdem26.github.io
November 5, 2025 at 4:59 PM
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 🍻
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 🍻
Reposted by Marc Joos
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! https://hpc-bigdata-fosdem26.github.io/
FOSDEM'26 HPC, Big Data, and Data Science Devroom
FOSDEM'26 HPC, Big Data, and Data Science Devroom
hpc-bigdata-fosdem26.github.io
November 12, 2025 at 4:33 PM
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! https://hpc-bigdata-fosdem26.github.io/
Reposted by Marc Joos
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
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
October 31, 2025 at 5:04 PM
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
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
Reposted by Marc Joos
💥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/...
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
July 20, 2025 at 10:45 AM
💥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/...
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/...
Reposted by Marc Joos
"HPC Finally Found Its Killer App -- Can It Survive?" My views in HPCwire.
#HPC #AI
www.hpcwire.com/2025/06/06/h...
#HPC #AI
www.hpcwire.com/2025/06/06/h...
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 […]
www.hpcwire.com
June 6, 2025 at 8:41 PM
"HPC Finally Found Its Killer App -- Can It Survive?" My views in HPCwire.
#HPC #AI
www.hpcwire.com/2025/06/06/h...
#HPC #AI
www.hpcwire.com/2025/06/06/h...
Reposted by Marc Joos
🚨 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
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
June 3, 2025 at 10:02 AM
🚨 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
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
Reposted by Marc Joos
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.
April 2, 2025 at 3:39 AM
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.
BlueSky: Attack of the Clones
The one with Jango Fett was more entertaining!
The one with Jango Fett was more entertaining!
May 2, 2025 at 10:09 PM
BlueSky: Attack of the Clones
The one with Jango Fett was more entertaining!
The one with Jango Fett was more entertaining!
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/cea-hpc/wi4mpi
#HPC #MPI
GitHub - cea-hpc/wi4mpi: Wrapper interface for MPI
Wrapper interface for MPI. Contribute to cea-hpc/wi4mpi development by creating an account on GitHub.
github.com
April 28, 2025 at 4:21 PM
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/cea-hpc/wi4mpi
#HPC #MPI
Reposted by Marc Joos
🚨 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
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
April 8, 2025 at 7:02 PM
🚨 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
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
Reposted by Marc Joos
EasyBuild now has a blog!
blog.easybuild.io
First post is a report on the 10th EasyBuild User Meeting (EUM'25) -> blog.easybuild.io/2025/03/28/e...
#HPC
blog.easybuild.io
First post is a report on the 10th EasyBuild User Meeting (EUM'25) -> blog.easybuild.io/2025/03/28/e...
#HPC
EasyBuild blog
blog.easybuild.io
April 8, 2025 at 7:23 PM
EasyBuild now has a blog!
blog.easybuild.io
First post is a report on the 10th EasyBuild User Meeting (EUM'25) -> blog.easybuild.io/2025/03/28/e...
#HPC
blog.easybuild.io
First post is a report on the 10th EasyBuild User Meeting (EUM'25) -> blog.easybuild.io/2025/03/28/e...
#HPC
Reposted by Marc Joos
If you are interested in running #HPC apps in cloud with #Kubernetes "Trends for Pulling HPC Containers in Cloud" - a look at the ecosystem since 2014 and a robust pulling study - is published this week at Cloud Computing 2025. It is work driven by my love and curiosity of container technologies. ❤️
ThinkMind(TM) Digital Library
www.thinkmind.org
April 7, 2025 at 12:42 AM
If you are interested in running #HPC apps in cloud with #Kubernetes "Trends for Pulling HPC Containers in Cloud" - a look at the ecosystem since 2014 and a robust pulling study - is published this week at Cloud Computing 2025. It is work driven by my love and curiosity of container technologies. ❤️
Reposted by Marc Joos
Kicking off day two of the 10th EasyBuild User Meeting at Jülich Supercomputing Centre (JSC) with a keynote by Jeff Hammond (NVIDIA)
Live stream via www.youtube.com/watch?v=2-4p...
Slides will be made available via easybuild.io/eum25/#program
@fzj-jsc.bsky.social #HPC
Live stream via www.youtube.com/watch?v=2-4p...
Slides will be made available via easybuild.io/eum25/#program
@fzj-jsc.bsky.social #HPC
March 26, 2025 at 8:13 AM
Kicking off day two of the 10th EasyBuild User Meeting at Jülich Supercomputing Centre (JSC) with a keynote by Jeff Hammond (NVIDIA)
Live stream via www.youtube.com/watch?v=2-4p...
Slides will be made available via easybuild.io/eum25/#program
@fzj-jsc.bsky.social #HPC
Live stream via www.youtube.com/watch?v=2-4p...
Slides will be made available via easybuild.io/eum25/#program
@fzj-jsc.bsky.social #HPC
Very nice to see French #QuantumComputing companies (Pasqal and Alice & Bob) on stage at #GTC25, we do indeed have a very exciting quantum ecosystem here!
And if you're an EU researcher, a Pasqal QPU will soon be available at @cea.fr TGCC!
And if you're an EU researcher, a Pasqal QPU will soon be available at @cea.fr TGCC!
March 20, 2025 at 10:15 PM
Very nice to see French #QuantumComputing companies (Pasqal and Alice & Bob) on stage at #GTC25, we do indeed have a very exciting quantum ecosystem here!
And if you're an EU researcher, a Pasqal QPU will soon be available at @cea.fr TGCC!
And if you're an EU researcher, a Pasqal QPU will soon be available at @cea.fr TGCC!
That's big news for France as the AI2F consortium is one of the #AIFactories selected. It strengthens the AI dimension of Alice Recoque, the EuroHPC exascale system deployed in France at @cea.fr, and it will help to foster & support an already very lively AI ecosystem in France
#HPC #AI #Europe
#HPC #AI #Europe
News Flash! ⚡
The @eurohpc-ju.bsky.social has selected #six new #AIFactories to strengthen Europe's #AI leadership! 🌍
Austria, Bulgaria, France, Germany, Poland, and Slovenia will host cutting-edge AI hubs, to boost #European AI innovation.
Read more: europa.eu/!rP6D6M
The @eurohpc-ju.bsky.social has selected #six new #AIFactories to strengthen Europe's #AI leadership! 🌍
Austria, Bulgaria, France, Germany, Poland, and Slovenia will host cutting-edge AI hubs, to boost #European AI innovation.
Read more: europa.eu/!rP6D6M
March 13, 2025 at 6:38 AM
That's big news for France as the AI2F consortium is one of the #AIFactories selected. It strengthens the AI dimension of Alice Recoque, the EuroHPC exascale system deployed in France at @cea.fr, and it will help to foster & support an already very lively AI ecosystem in France
#HPC #AI #Europe
#HPC #AI #Europe
Reposted by Marc Joos
The recorded video of our talk at FOSDEM25 is available: fosdem.org/2025/schedul...
Many thanks again to @marcjoos.bsky.social who did an excellent job presenting the talk and answering questions.
Many thanks again to @marcjoos.bsky.social who did an excellent job presenting the talk and answering questions.
fosdem.org
March 11, 2025 at 7:28 AM
The recorded video of our talk at FOSDEM25 is available: fosdem.org/2025/schedul...
Many thanks again to @marcjoos.bsky.social who did an excellent job presenting the talk and answering questions.
Many thanks again to @marcjoos.bsky.social who did an excellent job presenting the talk and answering questions.
Reposted by Marc Joos
I wrote a little text to accompany this slide. It sums up the hour-long presentation in just a few words.
www.glennklockwood.com/garden/diffe...
#HPC #AI
www.glennklockwood.com/garden/diffe...
#HPC #AI
differences between AI and HPC
System architecture There are a few differences between designing a supercomputer for AI and designing a supercomputer for traditional modeling and simulation ...
www.glennklockwood.com
February 16, 2025 at 7:13 PM
I wrote a little text to accompany this slide. It sums up the hour-long presentation in just a few words.
www.glennklockwood.com/garden/diffe...
#HPC #AI
www.glennklockwood.com/garden/diffe...
#HPC #AI
Reposted by Marc Joos
If you actively use or contribute to EasyBuild, please participate in the 8th EasyBuild User Survey:
ugent.qualtrics.com/jfe/form/SV_...
Help us reach our goal of at least 100 participants by the end of the month!
#HPC
ugent.qualtrics.com/jfe/form/SV_...
Help us reach our goal of at least 100 participants by the end of the month!
#HPC
8th EasyBuild User Survey
8th EasyBuild User Survey
ugent.qualtrics.com
February 6, 2025 at 7:25 AM
If you actively use or contribute to EasyBuild, please participate in the 8th EasyBuild User Survey:
ugent.qualtrics.com/jfe/form/SV_...
Help us reach our goal of at least 100 participants by the end of the month!
#HPC
ugent.qualtrics.com/jfe/form/SV_...
Help us reach our goal of at least 100 participants by the end of the month!
#HPC
Reposted by Marc Joos
ClusterShell 1.9.3 is now available in EPEL and Debian. Not using clustershell groups on your #HPC cluster yet?! Check out the new bash completion feature! Demo recorded on Sherlock at @stanford-rc.bsky.social with ~1,900 compute nodes and many group sources!
asciinema.org/a/699526
asciinema.org/a/699526
clustershell bash completion (v1.9.3)
This short recording demonstrates the bash completion feature available in ClusterShell 1.9.3, showcasing its benefits when using the clush and cluset command-line tools.
asciinema.org
February 3, 2025 at 5:49 AM
ClusterShell 1.9.3 is now available in EPEL and Debian. Not using clustershell groups on your #HPC cluster yet?! Check out the new bash completion feature! Demo recorded on Sherlock at @stanford-rc.bsky.social with ~1,900 compute nodes and many group sources!
asciinema.org/a/699526
asciinema.org/a/699526