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Test for Divisibility by 13
How to manually test whether a large number is divisible by 7, 11, and 13 all at the same time.
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 80,938 posts.
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Using `make` and `git diff` for a simple and powerful test harness
People regularly go for complex test harnesses; and when you’re in an ecosystem, they can be a good fit. But outside ecosystems, it’s actually quite easy to produce a fairly good test harness.
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Learn Rust the Dangerous Way
LRtDW is a series of articles putting Rust features in context for low-level C programmers who maybe don’t have a formal CS background — the sort of people who work on firmware, game engines, OS kernels, and the like. Basically, people like me.
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An EPYC escape: Case-study of a KVM breakout
Posted by Felix Wilhelm, Project ZeroIntroduction KVM (for Kernel-based Virtual Machine) is the ...
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This Is Why They Call It a Weakly-Ordered CPU
On this blog, I’ve been rambling on about lock-free programming subjects such as acquire and release semantics and weakly-ordered CPUs. I’ve tried to make these …
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Kernel-hack-drill and exploiting CVE-2024-50264 in the Linux kernel
Some memory corruption bugs are much harder to exploit than others. They can involve race conditions, crash the system, and impose limitations that make a researcher's life difficult. Working with such fragile vulnerabilities demands significant time and effort. CVE-2024-50264 in the Linux kernel is one such hard bug…
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Instrumentation: The First Four Things You Measure
Old observability metrics like uptime and MTTR aren't enough anymore. Teams must connect technical signals to business outcomes, like savings and speed.
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Key practices for achieving large professional goals
My hope is that this post will help you reach your own goals in 2020. I attained several long-term professional goals in 2019 and I’d like to share the key practices for how I did that to help you along your way. We’ll return to Cloud, Security, and DevOps topics in the New Year. I
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Hunting a 16-year-old SQLite WAL bug with TLA+
This article was written by Marco Manino and Alberto Carretero, dqlite team at Canonical. 1. Anatomy of a SQLite bug Recently SQLite published a new version with a fix to a long-standing bug in the way that the Write Ahead Log (WAL) is checkpointed that leads to the corruption of the database. The important aspect […]
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Hardening unused (sub)domains
Proper implementation of email hardening techniques can be beneficial even to (sub)domains that are not intended to be used with email.
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A technical guide to SEO
Complete technical SEO checklist covering HTTPS, meta tags, sitemaps, robots.txt, page speed, duplicate content, and Google Webmaster Tools setup.
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TensorFlow Graphics: Computer Graphics Meets Deep Learning
Posted by Julien Valentin and Sofien Bouaziz
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XKCD “Time” Wins Hugo Award for Best Graphic Story
The 72nd World Science Fiction Convention, Loncon 3, has announced the 2014 Hugo Award winners. 3587 valid ballots were received and counted in the final ballot. BEST NOVEL Ancillary Justice, by An…
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Creating the Longest Possible Ski Jump in “The Games: Winter Challenge”
An investigation into The Games; Winter Challenge
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I found a second vote.gov – and it's registered to the White House
There is a moment in every investigation where the thing you have been looking for finds you instead.
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The PSF has withdrawn a $1.5M proposal to US Government grant program
The Python Software Foundation was recently "recommended for funding" (NSF terminology) for a $1.5m grant from the US government National Science Foundation to help improve the security of the Python …
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Less is exponentially more (2012)
Here is the text of the talk I gave at the Go SF meeting in June, 2012. This is a personal talk. I do not speak for anyone else on the Go...
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The Web3 Fraud
By now effectively all ;login:’s readers have heard the term “web3” and “dapps” bandied about as if they are some great revolution. They are not. The technical underpinnings are so terrible that it is clear they exist only to hype the underlying cryptocurrencies. The actual utility of these “decentralized” systems is…
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IRIS²: The EU’s Response to Musk’s Starlink
The Renew Europe Group welcomes today’s plenary backing of the EU secure connectivity programme , renamed IRIS² , an ambitious plan to deploy an EU-owned…
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C isn't a programming language anymore
Phantomderp and I have both recently been very aligned on a particular subject: being extremely angry about C ABIs and trying to fix them . Where we’re not aligned is why we’re mad about them.
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The Merge
Learn about The Merge, when Ethereum Mainnet moved from proof-of-work to proof-of-stake in September 2022, cutting its energy use by about 99.95%.
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Preparing for KDE Plasma's Last X11-Supported Release
When we first announced the transition to Plasma Wayland, one of Martin's slides from stated, "It's done when it's done!"
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A philosophical difference between Haskell and Lisp (2015)
UPDATE 2020-08-03 : I no longer stand by the content in this post. I think the overall sentiment is marginally accurate; however, the details in the post are incorrect (as many have pointed out over the years).
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The Blockchain Bubble Will Pop, What Next?
Last week, I flew from London to Tel Aviv. The man sitting to my right was a road warrior, just this side of a late-night bender in London. He was rocking an ostentatious pair of