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macOS's Little-Known Command-Line Sandboxing Tool (2025)
AVAILABLE NOW OpenAI, Anthropic, and Chrome ship it. Apple deprecated it. Nobody documented it. Until now. → sandbox-exec: The Miss...
Topics /
Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 4,387 posts.
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A x64 OS #1: UEFI
I briefly cover what it takes to start writing a kernel which bootstraps in UEFI, as opposed to BIOS.
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Optimizing Open Addressing
Your default hash table should be open-addressed, using Robin Hood linear probing with backward-shift deletion. When prioritizing deterministic performance over memory efficiency, two-way chaining is also a good choice.
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Fallacies of distributed systems
Fallacies of distributed systems are a set of assertions made by L Peter Deutsch and others at Sun Microsystems describing false assumptions that programmers new to distributed applications invariably make.
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Mo RAM, Mo Problems (2025)
As a retro-computer enthusiast, it seems that parts are either insanely expensive or dirt cheap. If the first case has obvious problems, the second can also lead to issues.
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Apple's list of 235 apps that are incompatible with macOS Catalina
A bundle called IncompatibleAppsList.bundle found in /Library/Apple/Library/Bundles/ in macOS Catalina contains a of list of 235 apps that are incompatible with Catalina.
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Handles are the better pointers (2018)
28-Nov-2018: I’ve added a small update at the end on how to prevent‘handle collisions’ with a per-slot generation counter
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No NAT November: My month without IPv4
Near the beginning of November, nixCraft posted this challenge on Mastodon, daring people to take the No NAT November challenge and disable IPv4 for the month, relying only on IPv6:
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Hell is a multi-threaded C++ program (2006)
What are threads? Every modern operating system has support for threads, and most programming environments provide some level of support for...
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Beware of sudo on OS X
There's a little kerfuffle going on over on HN about a newly discovered local root exploit on OS X 10.10.5 , so I thought this might be a g...
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Fast and cheap bulk storage: using LVM to cache HDDs on SSDs
My attempt to create fast and cheap bulk storage by caching HDDs with SSDs on Linux, using standard lvmcache. Contains an introduction to LVM, RAID, and partitioning.
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Your terminal is not a terminal: An Introduction to Streams
Hot takes and cold truths on software, startups, and the lies we tell ourselves.
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Pipes and Filters
Pipelines are an extremely useful (and surprisingly underused) architectural pattern in modern software engineering. The concept of using pipes and filters) to control the flow of data through...
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SIMD-friendly algorithms for substring searching (2016)
Popular programming languages provide methods or functions which locate a substring in a given string. In C it is the function strstr , the C++ class std::string has the method find , Python's string has methods pos and index , and so on, so forth. All these APIs were designed for one-shot searches . During past…
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Hypervisor Development in Rust
In the ever-evolving field of information security, curiosity and continuous learning drive innovation. This blog series is tailored for those deeply engaged in experimental projects, leveraging Rust’s capabilities to push the boundaries of what’s possible. The focus on Rust, after exploring various programming…
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Big News for ZFS on Linux
Canonical announced a few weeks ago that ZFS will be included in the next release of Ubuntu Linux, on by default and fully supported. And it’s no exaggeration…
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Back to FreeBSD: Part 1
Containers ran in production on FreeBSD thirteen years before Docker. So why does nobody talk about it?
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Molly guard in reverse
A blog about software craft and quality
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Uxn is a virtual machine with 32 instructions
By Devine Lu Linvega
1465
Playstation 2 GS emulation – the final frontier of Vulkan compute emulation
As you may, or may not know, I wrote paraLLEl-RDP back in 2020. It aimed at implementing the N64 RDP in Vulkan compute. Lightning fast, and extremely accurate, plus the added support of up-scaling on top. I’m quite happy how it turned out. Of course, the extreme accuracy was due to Angrylion being used as reference…
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Unusual circuits in the Intel 386's standard cell logic
I've been studying the standard cell circuitry in the Intel 386 processor recently. The 386, introduced in 1985, was Intel's most complex pr...
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Reducing Memory Usage in Ruby
I’ve been working on building a compacting garbage collector in Ruby for a while now, and one of the biggest hurdles for implementing a compacting GC is updating references. For example, if Object A points to Object B, but the compacting GC moves Object B, how do we make sure that Object A points to the new location?…
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Introduction to Coreboot, an open source BIOS
Deze pagina bestaat niet of is niet meer beschikbaar. Oude XS4ALL-homepages zijn soms nog terug te vinden via webarchieven.
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Hunting down the stuck BGP routes
BGP is the glue between all of the thousands of border routers that make up the internet (you can find this post (battleships) and this post (EvE) as a crash course on how BGP works).