@halvarflake.bsky.social
Reposted
Great slides from Halvar here
A background in the philosophy of science is definitely serving me well in this new world!
A background in the philosophy of science is definitely serving me well in this new world!
September 17, 2026 at 3:54 AM
Great slides from Halvar here
A background in the philosophy of science is definitely serving me well in this new world!
A background in the philosophy of science is definitely serving me well in this new world!
I gave a talk at Bluehat Singapore today. The slides are here:
thomasdullien.github.io/about/slides...
thomasdullien.github.io/about/slides...
September 17, 2026 at 3:44 AM
I gave a talk at Bluehat Singapore today. The slides are here:
thomasdullien.github.io/about/slides...
thomasdullien.github.io/about/slides...
Reposted
The Pentagon fired the publisher and editor in chief of Stars and Stripes, the military newspaper that is supposed to maintain editorial independence from the very department it covers.
August 22, 2026 at 12:18 PM
The Pentagon fired the publisher and editor in chief of Stars and Stripes, the military newspaper that is supposed to maintain editorial independence from the very department it covers.
I wrote up three important lessons I learnt ony path to "maturity":
thomasdullien.github.io/posts/2026-0...
thomasdullien.github.io/posts/2026-0...
Three important steps in my maturation process – Thomas Dullien / Halvar Flake
thomasdullien.github.io
August 22, 2026 at 3:23 PM
I wrote up three important lessons I learnt ony path to "maturity":
thomasdullien.github.io/posts/2026-0...
thomasdullien.github.io/posts/2026-0...
The EU gets a bad rap, but ... sometimes we have to appreciate that the 1949-2026 period is the longest period in *documented history* without interstate war among the bloodthirsty western European tribes.
August 8, 2026 at 6:01 AM
The EU gets a bad rap, but ... sometimes we have to appreciate that the 1949-2026 period is the longest period in *documented history* without interstate war among the bloodthirsty western European tribes.
I have a personal update: Next monday, I will be starting at @OpenAI working on better cyber (which will also entail some efficiency work). I'm pretty excited about the things I will learn and the things we will do.
August 4, 2026 at 11:46 AM
I have a personal update: Next monday, I will be starting at @OpenAI working on better cyber (which will also entail some efficiency work). I'm pretty excited about the things I will learn and the things we will do.
Reposted
"We Hacked Three Companies and Didn't Even Notice"
OpenAI used to be the one insisting its models were scary. Now Anthropic is filing the incident report, and the flex is showing through it.
open.substack.com/pub/arunning...
OpenAI used to be the one insisting its models were scary. Now Anthropic is filing the incident report, and the flex is showing through it.
open.substack.com/pub/arunning...
"We Hacked Three Companies and Didn't Even Notice"
OpenAI used to be the one insisting its models were scary. Now Anthropic is filing the incident report, and the flex is showing through it.
open.substack.com
August 2, 2026 at 11:13 AM
"We Hacked Three Companies and Didn't Even Notice"
OpenAI used to be the one insisting its models were scary. Now Anthropic is filing the incident report, and the flex is showing through it.
open.substack.com/pub/arunning...
OpenAI used to be the one insisting its models were scary. Now Anthropic is filing the incident report, and the flex is showing through it.
open.substack.com/pub/arunning...
I made a small animation illustrating my geometric intuition for what happens inside a simple feedforward ReLU neural network. Hope this is illuminating for someone.
June 25, 2026 at 11:10 PM
I made a small animation illustrating my geometric intuition for what happens inside a simple feedforward ReLU neural network. Hope this is illuminating for someone.
Reposted
Thanks @halvarflake.bsky.social -- it's so good / must read (and it's not even finished yet!)
In the last years, I spent some of my scarce free time writing up what I had learnt starting and running two companies, zynamics and optimyze
The article is still work-in-progress, but I thought it's best to publish it now and iterate in public:
thomasdullien.github.io/guides/entre...
The article is still work-in-progress, but I thought it's best to publish it now and iterate in public:
thomasdullien.github.io/guides/entre...
Halvar’s Guide to Entrepreneurship – Thomas Dullien / Halvar Flake
Thomas Dullien’s guide to software and SaaS B2B entrepreneurship.
thomasdullien.github.io
June 23, 2026 at 2:28 PM
Thanks @halvarflake.bsky.social -- it's so good / must read (and it's not even finished yet!)
In the last years, I spent some of my scarce free time writing up what I had learnt starting and running two companies, zynamics and optimyze
The article is still work-in-progress, but I thought it's best to publish it now and iterate in public:
thomasdullien.github.io/guides/entre...
The article is still work-in-progress, but I thought it's best to publish it now and iterate in public:
thomasdullien.github.io/guides/entre...
Halvar’s Guide to Entrepreneurship – Thomas Dullien / Halvar Flake
Thomas Dullien’s guide to software and SaaS B2B entrepreneurship.
thomasdullien.github.io
June 23, 2026 at 10:57 AM
In the last years, I spent some of my scarce free time writing up what I had learnt starting and running two companies, zynamics and optimyze
The article is still work-in-progress, but I thought it's best to publish it now and iterate in public:
thomasdullien.github.io/guides/entre...
The article is still work-in-progress, but I thought it's best to publish it now and iterate in public:
thomasdullien.github.io/guides/entre...
The weirdest observation: I generated movies visualizing the polytope boundaries for ReLU networks using Muon and AdamW.
Same experiment, same data, same random seed. The difference is the "crease pattern" that the optimizers produce.
Same experiment, same data, same random seed. The difference is the "crease pattern" that the optimizers produce.
June 10, 2026 at 9:19 AM
The weirdest observation: I generated movies visualizing the polytope boundaries for ReLU networks using Muon and AdamW.
Same experiment, same data, same random seed. The difference is the "crease pattern" that the optimizers produce.
Same experiment, same data, same random seed. The difference is the "crease pattern" that the optimizers produce.
Confession time: I use agentic coding all day, every day. It makes me much more productive.
But I am also terrified of skill atrophy, I feel like I need to break out pen & paper to force myself to "weight-lift" mentally so I don't forget how to think.
How do y'all handle this?
But I am also terrified of skill atrophy, I feel like I need to break out pen & paper to force myself to "weight-lift" mentally so I don't forget how to think.
How do y'all handle this?
May 22, 2026 at 10:11 AM
Confession time: I use agentic coding all day, every day. It makes me much more productive.
But I am also terrified of skill atrophy, I feel like I need to break out pen & paper to force myself to "weight-lift" mentally so I don't forget how to think.
How do y'all handle this?
But I am also terrified of skill atrophy, I feel like I need to break out pen & paper to force myself to "weight-lift" mentally so I don't forget how to think.
How do y'all handle this?
Reposted
The most insightful take on Mythos I've seen so far. Everyone should read this but especially those who are currently thinking through the possible regulatory responses.
May 13, 2026 at 7:56 AM
The most insightful take on Mythos I've seen so far. Everyone should read this but especially those who are currently thinking through the possible regulatory responses.
Reposted
rewatching @halvarflake.bsky.social 's fuzzing24 keynote and thinkin real hard
www.youtube.com/watch?v=Jd1h...
www.youtube.com/watch?v=Jd1h...
April 29, 2026 at 6:49 PM
rewatching @halvarflake.bsky.social 's fuzzing24 keynote and thinkin real hard
www.youtube.com/watch?v=Jd1h...
www.youtube.com/watch?v=Jd1h...
Reposted
In an infosec context @halvarflake.bsky.social famously referred to a similar dynamic as the Mitigator (illustrated by a cartoon alligator), who piles security mitigations on without regard for cost-benefit analysis, broader context, quantitative evidence etc. on the theory it "makes things harder"
It shows not only America being lol about rail, but the utterly insane way America thinks about public safety.
"Just one more security control/surveillance measure" is the "one more lane" of the American public security imagination.
"Just one more security control/surveillance measure" is the "one more lane" of the American public security imagination.
May 5, 2026 at 10:19 PM
In an infosec context @halvarflake.bsky.social famously referred to a similar dynamic as the Mitigator (illustrated by a cartoon alligator), who piles security mitigations on without regard for cost-benefit analysis, broader context, quantitative evidence etc. on the theory it "makes things harder"
Reposted
@halvarflake.bsky.social this sounds like your prediction.
That machine learning will be more useful for offense, than for defense.
Video by @hankgreen.bsky.social
(Haven’t heard the whole video yet)
That machine learning will be more useful for offense, than for defense.
Video by @hankgreen.bsky.social
(Haven’t heard the whole video yet)
You Actually Do Need to Understand Mythos
YouTube video by Hank Green
youtu.be
April 10, 2026 at 7:52 PM
@halvarflake.bsky.social this sounds like your prediction.
That machine learning will be more useful for offense, than for defense.
Video by @hankgreen.bsky.social
(Haven’t heard the whole video yet)
That machine learning will be more useful for offense, than for defense.
Video by @hankgreen.bsky.social
(Haven’t heard the whole video yet)
With age, the male body produces less testosterone but more advice.
April 20, 2026 at 5:21 PM
With age, the male body produces less testosterone but more advice.
Reposted
consistently see +/-20% swings on AWS in our benchmarks
April 6, 2026 at 12:58 AM
consistently see +/-20% swings on AWS in our benchmarks
Reposted
Same code using twice as much CPU.
Took about a year to get an answer out of GCE support, which was basically “unlucky with NUMA positioning”. (Oh, and the hypervisor lies about NUMA)
Took about a year to get an answer out of GCE support, which was basically “unlucky with NUMA positioning”. (Oh, and the hypervisor lies about NUMA)
April 4, 2026 at 4:38 PM
Same code using twice as much CPU.
Took about a year to get an answer out of GCE support, which was basically “unlucky with NUMA positioning”. (Oh, and the hypervisor lies about NUMA)
Took about a year to get an answer out of GCE support, which was basically “unlucky with NUMA positioning”. (Oh, and the hypervisor lies about NUMA)
I am observing up to 30% (!!!) wall-time fluctuations running the same code on the same data and the same VM type on GCE.
That seems insane to me, in terms of noisy neighbor effects.
What is the worst fluctuation you've seen on cloud machines?
That seems insane to me, in terms of noisy neighbor effects.
What is the worst fluctuation you've seen on cloud machines?
April 4, 2026 at 8:39 AM
I am observing up to 30% (!!!) wall-time fluctuations running the same code on the same data and the same VM type on GCE.
That seems insane to me, in terms of noisy neighbor effects.
What is the worst fluctuation you've seen on cloud machines?
That seems insane to me, in terms of noisy neighbor effects.
What is the worst fluctuation you've seen on cloud machines?
Reposted
A remarkable photo from #NoKings in DTLA from Connor Sheets of @latimes.com www.latimes.com/california/l...
March 29, 2026 at 2:09 AM
A remarkable photo from #NoKings in DTLA from Connor Sheets of @latimes.com www.latimes.com/california/l...
Reposted
It is the sovereign legal right of every country on the planet to repudiate their debt, and they can and do suffer essentially no consequences other than loss of access to credit markets for about 3-5 years. This is in fact so disastrous that countries prefer almost anything else to doing it!
What's something that experts/practitioners in your field universally agree upon, but that remains a "hot take" among the general public?
March 29, 2026 at 5:00 AM
It is the sovereign legal right of every country on the planet to repudiate their debt, and they can and do suffer essentially no consequences other than loss of access to credit markets for about 3-5 years. This is in fact so disastrous that countries prefer almost anything else to doing it!
Reposted
Excellent - and so rare!! - overview of the role of Europe for US mil operations.
“Europe remains the bedrock of U.S. force projection in the world and any action to cut those ties with Europe “would be a huge loss to the U.S.,” said Bence Nemeth. “It would cost time, money and resources.””
“Europe remains the bedrock of U.S. force projection in the world and any action to cut those ties with Europe “would be a huge loss to the U.S.,” said Bence Nemeth. “It would cost time, money and resources.””
Europe Is Quietly Playing a Crucial Role in the Iran War
European military bases are facilitating one of the most logistically complex operations the U.S. military has been involved in for decades.
www.wsj.com
March 28, 2026 at 1:05 PM
Excellent - and so rare!! - overview of the role of Europe for US mil operations.
“Europe remains the bedrock of U.S. force projection in the world and any action to cut those ties with Europe “would be a huge loss to the U.S.,” said Bence Nemeth. “It would cost time, money and resources.””
“Europe remains the bedrock of U.S. force projection in the world and any action to cut those ties with Europe “would be a huge loss to the U.S.,” said Bence Nemeth. “It would cost time, money and resources.””
Reposted
reading this im kinda happy with myself to have recommended pretty much that to my team
I wrote a few lines about my development setup (which - by accident, not by design - mitigates a good number of risks associated with vibecoding. Not all of them, but many.)
addxorrol.blogspot.com/2026/03/slig...
addxorrol.blogspot.com/2026/03/slig...
Slightly safer vibecoding by adopting old hacker habits
I have seen a lot of public discussion around supply-chain attacks on the Python ecosystem, prompt injection risks when using coding agents,...
addxorrol.blogspot.com
March 25, 2026 at 7:47 AM
reading this im kinda happy with myself to have recommended pretty much that to my team