1531
Uxn is a virtual machine with 32 instructions
By Devine Lu Linvega
New
The latest blog posts to take off on Hacker News. 4,388 posts.
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Optimizing compilers reload vector constants needlessly
Modern processors have powerful vector instructions which allow you to load several values at once, and operate (in one instruction) on all these values. Similarly, they allow you to have vector constants. Thus if you wanted to add some integer (say 10001) to all integers in a large array, you might first load a…
1534
Linux Certificate Authority root stores have a too simple view of 'trust'
You're probably reading this page because you've attempted to access some part of my blog (Wandering Thoughts) or CSpace , the wiki thing it's part of. Unfortunately you're using a browser version that my anti-crawler precautions consider suspicious, most often because it's too old (most often this applies to versions…
1535
How to JIT – An Introduction
When I wrote the introductory article for libjit , I aimed it at programmers who know what JITs are, at least to some extent. I did mention what a JIT is, but only very briefly. The purpose of this article is to provide a better introductory overview of JITing, with code samples that don't rely on any libraries.
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Notes on ExFAT and Reliability (2021)
Is exFAT as fragile as some say?
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Falsehoods programmers believe about undefined behavior
All kinds of reasonable-sounding beliefs about undefined behavior are wrong. Let's go through them.
1538
Clang is better than GCC
Yes, this is a problem of weak static typing of pure C. Pure C is a great tool for some jobs, but here be dragons , as they say.
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I/O is no longer the bottleneck
In 2022, disk I/O is very fast, and not usually the performance bottleneck in programs. This article digs into some numbers.
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Cache invalidation really is one of the hardest problems in computer science
My colleagues recently wrote a great post on the Netflix tech blog about a tough performance issue they wrestled with. They ultimately diagnosed the problem as false sharing, which is a performance…
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89 Operating Systems
I occasionally do talks about curl. In these talks I often include a few slides that say something abut curl's coverage and presence on different platforms. Mostly to boast of course, but also to help explain to the audience how curl has manged to reach its ten billion installations. This is current incarnation of…
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The Great Renaming 1985 – 1988 (2000)
The Great Renaming FAQ
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Inverting a binary tree using x64 assembly
While browsing twitter, I came across this tweet:
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Safely writing code that isn't thread-safe
An under-appreciated Rust feature
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Building the fastest Lua interpreter automatically
This is Part 1 of a series of posts. Part 2 is available here: Building a baseline JIT for Lua automatically It is well-known that writing a good VM for a dynamic language is never an easy job. High
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Please restore our registers when you’re done with them
“Hey, you. Yes you, that function over there. When you’re cleaning up please remember to restore all of my registers. Yes, that one too – what do you think this is, Linux?”That’s the problem I was …
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Investigating why Steam started picking a random font
Out of the blue my Steam started picking a random font I had in my user fonts dir: Virgil , the Excalidraw font.
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Use this kernel parameter in your kiosk
r/PBSOD is a fun subreddit all about posting pictures of broken kiosks and information/entertainment systems in public. It stands for Public Blue Screen of Death which is a Windowsism but Linux systems are posted there too. If you spend enough time scrolling, you might notice two things: There’s a scary number of…
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Fast CI with MicroVMs
I saw an opportunity to fix self-hosted runners for GitHub Actions. Actuated is now in pilot and aims to solve most if not all of the friction.
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Inside boost::unordered_flat_map
Introduction The case for open addressing SIMD-accelerated lookup boost::unordered_flat_map data structure Rehashing Hash post-mixing Sta...
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Amazon’s distributed computing manifesto (1998)
Today, I am publishing the Distributed Computing Manifesto, a canonical document from the early days of Amazon that transformed the architecture of Amazon's ecommerce platform. It highlights the challenges we were facing at the end of the 20th century, and hints at where we were headed.
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Optimizations can have unexpectedly large effects when combined with caches
This post is about a non-obvious interaction between performance optimizations and LRU/time limited caching.
1555
Scaling Mastodon is impossible
Now that Twitter is dying, what can replace it?
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Making a Go program faster with a one-character change
Harry Marr — Member of Technical Staff at Anthropic. Co-founded Dependabot, previously at GitHub, Monzo, and GoCardless.
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Build the Modular Monolith First
Even talking about building a monolith today, is a bit taboo. It is all about microservices at the moment, and has been for a few years. But they aren’t a silver bullet…
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Building a simple shell in C – Part 3
Implementing the execution functionality of the shell
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Why does zsh start so slowly?
I’m serious about shell startup speed. I use tmux to open and close tmux splits all day every day, so I need zsh to start quickly. I used to use frameworks like oh-my-zsh or prezto and while I was happy with the functionality they provided I wasn’t happy with their impact on my shell’s startup speed. So, what do we do…
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