Will Killian
@willkill07.bsky.social
HPC / Runtimes / Programming Models / C++
The views and opinions expressed in this account are those of my own and do not represent those of my employer, NVIDIA.
The views and opinions expressed in this account are those of my own and do not represent those of my employer, NVIDIA.
Day 1 of #sc25
Tutorials and Workshops kick off this morning!
Some Student Programming events are also running today:
- HPC/AI Crash Course - 8:30AM until 3:30PM in Room 263. Please note this required preregistration
- Career Panel - 3:45PM until 4:45PM in Room 263
Tutorials and Workshops kick off this morning!
Some Student Programming events are also running today:
- HPC/AI Crash Course - 8:30AM until 3:30PM in Room 263. Please note this required preregistration
- Career Panel - 3:45PM until 4:45PM in Room 263
November 16, 2025 at 1:57 PM
Day 1 of #sc25
Tutorials and Workshops kick off this morning!
Some Student Programming events are also running today:
- HPC/AI Crash Course - 8:30AM until 3:30PM in Room 263. Please note this required preregistration
- Career Panel - 3:45PM until 4:45PM in Room 263
Tutorials and Workshops kick off this morning!
Some Student Programming events are also running today:
- HPC/AI Crash Course - 8:30AM until 3:30PM in Room 263. Please note this required preregistration
- Career Panel - 3:45PM until 4:45PM in Room 263
Wonderful view of the St Louis skyline coming in on my flight. Eagerly anticipating this year’s #sc25 #hpcignites
November 15, 2025 at 6:09 PM
Wonderful view of the St Louis skyline coming in on my flight. Eagerly anticipating this year’s #sc25 #hpcignites
Reposted by Will Killian
Frontiere ran on Frontier. This alone is worth recognition.
The TLDR is that a really big HACC job ran on Frontier with a bunch of new algorithmic optimizations. Neato.
The TLDR is that a really big HACC job ran on Frontier with a bunch of new algorithmic optimizations. Neato.
ORNL: Largest-Ever Universe Simulation Up for Supercomputing’s Highest Prize
#ORNL #HPC #SC25
Link: ow.ly/9L6o50Xs2gv
#ORNL #HPC #SC25
Link: ow.ly/9L6o50Xs2gv
ORNL: Largest-Ever Universe Simulation Up for Supercomputing’s Highest Prize - HPCwire
DOE researchers are recognized for simulations on the Frontier supercomputer that capture the interactions between gravity and gas spanning 15 billion light-years of cosmic space Nov. 14, 2025 — Last ...
ow.ly
November 15, 2025 at 2:54 PM
Frontiere ran on Frontier. This alone is worth recognition.
The TLDR is that a really big HACC job ran on Frontier with a bunch of new algorithmic optimizations. Neato.
The TLDR is that a really big HACC job ran on Frontier with a bunch of new algorithmic optimizations. Neato.
Reposted by Will Killian
This December, I'll be posting an article & video each day until Christmas in the Advent of Compiler Optimisations! #AoCO2025
Each day we'll explore a fun optimisation in C or C++; some low-level, x86 or ARM-specific, some high-level. Hope you'll join me!
YT: youtube.com/mattgodbolt
Blog: xania.org
Each day we'll explore a fun optimisation in C or C++; some low-level, x86 or ARM-specific, some high-level. Hope you'll join me!
YT: youtube.com/mattgodbolt
Blog: xania.org
Matt Godbolt’s blog
xania.org
November 13, 2025 at 7:51 PM
This December, I'll be posting an article & video each day until Christmas in the Advent of Compiler Optimisations! #AoCO2025
Each day we'll explore a fun optimisation in C or C++; some low-level, x86 or ARM-specific, some high-level. Hope you'll join me!
YT: youtube.com/mattgodbolt
Blog: xania.org
Each day we'll explore a fun optimisation in C or C++; some low-level, x86 or ARM-specific, some high-level. Hope you'll join me!
YT: youtube.com/mattgodbolt
Blog: xania.org
Reposted by Will Killian
P.S.: If you'd like to support our open-source projects including our jobs board, Slack/Discord/Mastodon, community map, weekly online chat, podcasts, community syndicated blog, discussion area, surveys, please click on one of the links below: github.com/sponsors/hpc... or github.com/sponsors/hpc...
Sponsor @hpc-social on GitHub Sponsors
The hpc-social resources provide an open platform for community engagement, including a variety of open source work on code and resources hosted on the hpc.social domain and associated community ca...
github.com
November 11, 2025 at 11:32 PM
P.S.: If you'd like to support our open-source projects including our jobs board, Slack/Discord/Mastodon, community map, weekly online chat, podcasts, community syndicated blog, discussion area, surveys, please click on one of the links below: github.com/sponsors/hpc... or github.com/sponsors/hpc...
Reposted by Will Killian
Dear all #HPC and #AI/#Quantum/#RCD and #Supercomputing folks and friends: It's just 3 years since we launched the survey.hpc.social/results/hpc-... that led to the creation of the multi-faceted set of resources of the hpc.social website and tools. This is just to say THANK YOU and see you at #SC25!
Welcome to HPC.social!
A welcome to our high performance computing community!
hpc.social
November 11, 2025 at 11:19 PM
Dear all #HPC and #AI/#Quantum/#RCD and #Supercomputing folks and friends: It's just 3 years since we launched the survey.hpc.social/results/hpc-... that led to the creation of the multi-faceted set of resources of the hpc.social website and tools. This is just to say THANK YOU and see you at #SC25!
Reposted by Will Killian
#SC25 will open with a 2-day #HPC Crash Course based on OLCF training at ORNL.
The course is free with Student Program registration, but spots are limited.
sc25.supercomputing.org/2025/08/igni...
The course is free with Student Program registration, but spots are limited.
sc25.supercomputing.org/2025/08/igni...
Ignite Your SC25 Journey: HPC Crash Course & Student Programming • SC25
Designed to ignite curiosity, spark innovation, and fuel lasting connections, Student Programming can empower your week at SC25.
sc25.supercomputing.org
August 19, 2025 at 6:44 PM
#SC25 will open with a 2-day #HPC Crash Course based on OLCF training at ORNL.
The course is free with Student Program registration, but spots are limited.
sc25.supercomputing.org/2025/08/igni...
The course is free with Student Program registration, but spots are limited.
sc25.supercomputing.org/2025/08/igni...
Reposted by Will Killian
I’m increasingly convinced by an argument I saw recently that LLMs are effectively power tools (apologies for not remembering the cite!):
- Incredibly useful for experts in a field that are able to correct for their errors
- Really dangerous for layfolk who don’t know what they don’t know
- Incredibly useful for experts in a field that are able to correct for their errors
- Really dangerous for layfolk who don’t know what they don’t know
August 12, 2025 at 2:13 AM
I’m increasingly convinced by an argument I saw recently that LLMs are effectively power tools (apologies for not remembering the cite!):
- Incredibly useful for experts in a field that are able to correct for their errors
- Really dangerous for layfolk who don’t know what they don’t know
- Incredibly useful for experts in a field that are able to correct for their errors
- Really dangerous for layfolk who don’t know what they don’t know
Reposted by Will Killian
Statement from the largest economics association about the BLS firing
As context: AEA approximately never makes such public statements
This is a big deal
As context: AEA approximately never makes such public statements
This is a big deal
August 2, 2025 at 8:13 PM
Statement from the largest economics association about the BLS firing
As context: AEA approximately never makes such public statements
This is a big deal
As context: AEA approximately never makes such public statements
This is a big deal
Reposted by Will Killian
💥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 Will Killian
Why are they called "relaxed" atomics, but whenever I have to use them, I become very stressed?
July 10, 2025 at 3:36 PM
Why are they called "relaxed" atomics, but whenever I have to use them, I become very stressed?
Reposted by Will Killian
The President's Budget request as released yesterday will gut scientific research. Why should you care?
1) Science is fundamentally a jobs program. Many 100,000s are employed to do science and work for you, the US taxpayer.
1) Science is fundamentally a jobs program. Many 100,000s are employed to do science and work for you, the US taxpayer.
May 31, 2025 at 3:30 PM
The President's Budget request as released yesterday will gut scientific research. Why should you care?
1) Science is fundamentally a jobs program. Many 100,000s are employed to do science and work for you, the US taxpayer.
1) Science is fundamentally a jobs program. Many 100,000s are employed to do science and work for you, the US taxpayer.
Reposted by Will Killian
Announcing the 44 Accepted #SC25 Workshops
o Workshops with Proceedings
o Symposium-style Workshops
sc25.supercomputing.org/2025/05/anno...
#HPC
o Workshops with Proceedings
o Symposium-style Workshops
sc25.supercomputing.org/2025/05/anno...
#HPC
Announcing the 44 Accepted SC25 Workshops • SC25
SC25 has accepted 33 workshops to which you may submit a paper for possible publication. Eleven workshops are symposium-style.
sc25.supercomputing.org
May 20, 2025 at 7:13 PM
Announcing the 44 Accepted #SC25 Workshops
o Workshops with Proceedings
o Symposium-style Workshops
sc25.supercomputing.org/2025/05/anno...
#HPC
o Workshops with Proceedings
o Symposium-style Workshops
sc25.supercomputing.org/2025/05/anno...
#HPC
@tartanllama.xyz Look at what came in the post yesterday!
April 9, 2025 at 2:30 PM
@tartanllama.xyz Look at what came in the post yesterday!
Reposted by Will Killian
repost to upset a C++ programmer:
int main() {
int a = 0xE + 1; // compiles
int b = 0xE+1; // doesn't
}
int main() {
int a = 0xE + 1; // compiles
int b = 0xE+1; // doesn't
}
March 18, 2025 at 3:13 PM
repost to upset a C++ programmer:
int main() {
int a = 0xE + 1; // compiles
int b = 0xE+1; // doesn't
}
int main() {
int a = 0xE + 1; // compiles
int b = 0xE+1; // doesn't
}
At the end of the day, everything is a data movement problem.
March 6, 2025 at 3:49 AM
At the end of the day, everything is a data movement problem.
Reposted by Will Killian
Damn, I didn't expect C++ Wrapped to go so hard this year
December 4, 2024 at 4:40 PM
Damn, I didn't expect C++ Wrapped to go so hard this year
Reposted by Will Killian
Btw the below is why I find mixed precision #HPC so interesting. There’s potentially *huge* performance upsides, but if you get it wrong, it’s *all* wrong.
I personally want code to run extremely quickly; it's why I love HPC/performance engineering.
But code that runs fast while producing garbage is even worse than code that doesn't run at all.
I think the goal *must* be to enable the science in an accessible, complaint way
But code that runs fast while producing garbage is even worse than code that doesn't run at all.
I think the goal *must* be to enable the science in an accessible, complaint way
November 29, 2024 at 4:40 PM
Btw the below is why I find mixed precision #HPC so interesting. There’s potentially *huge* performance upsides, but if you get it wrong, it’s *all* wrong.
Having skimmed through the preorder PDF, I can confidently state that Sy’s work here is awesome. They do a great job of breaking down everything you need to know about debuggers. And it’s refreshing to read about targeted use cases for all sorts of APIs at the system and kernel level.
My upcoming book that teaches you how to write a native Linux debugger is 40% off today and tomorrow with the code PREORDER!
It teaches you everything from how breakpoints work, to tracing shared library loads, to executing function calls inside the running process, and more
It teaches you everything from how breakpoints work, to tracing shared library loads, to executing function calls inside the running process, and more
Building a Debugger
Download Chapter 3: Attaching to a Process If debuggers seem like magic to you, there is no better way to demystify them than to write your own.
nostarch.com
November 27, 2024 at 6:18 PM
Having skimmed through the preorder PDF, I can confidently state that Sy’s work here is awesome. They do a great job of breaking down everything you need to know about debuggers. And it’s refreshing to read about targeted use cases for all sorts of APIs at the system and kernel level.
Reposted by Will Killian
Missing those #HPC hallway conversations from #SC24 or other conferences and events? Wish you could continue them on a longer-term basis? Don't worry, we've got you covered! The hpc-hallway.github.io/The-Hallway/ is an open, informal weekly online videocall of people you can join weekly for free!
Welcome to HPC Hallway
hpc-hallway.org // hpc-hallway.de
hpc-hallway.github.io
November 26, 2024 at 7:11 PM
Missing those #HPC hallway conversations from #SC24 or other conferences and events? Wish you could continue them on a longer-term basis? Don't worry, we've got you covered! The hpc-hallway.github.io/The-Hallway/ is an open, informal weekly online videocall of people you can join weekly for free!
Reposted by Will Killian
