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Building columnar compression in a row-oriented database
Read how we built a flexible, high-performance columnar compression mechanism for PostgreSQL to add scalability to our favorite database.
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The latest blog posts to take off on Hacker News. 498 posts.
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Destroying x86_64 instruction decoders with differential fuzzing
TL;DR: x86_64 decoding is hard, and the number and variety of implementations available for it makes it uniquely suited to differential fuzzing. We’re open sourcing mishegos, a differential fuzzer for instruction decoders. You can use it to discover discrepancies in your own decoders and analysis tools! In the…
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Deepstream 5.0: Resurrected using MIT license
A realtime server for the modern web
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Beating C with Futhark Running on GPU
A high-performance and high-level purely functional data-parallel array programming language that can execute on the GPU and CPU.
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Rust and C++ on Floating-Point Intensive Code
I have developed some interest in the Rust programming language. Rust is a systems programming language which means it gets out of the way of developers interested in reaching low-level internals of a system. What sets it aside from other systems languages though is: Borrow checking to guarantee memory safety…
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Dramatically reduced power usage in Firefox 70 on macOS with Core Animation
In Firefox 70 we changed how pixels get to the screen on macOS. This allows us to do less work per frame when only small parts of the screen change. As a result, Firefox 70 drastically reduces the …
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63 Cores Blocked by Seven Instructions
I seem to have a habit of writing about super powerful machines whose many cores are laid low by misuse of locks. So. Yeah. It’s that again. But this one seems particularly impressive. I mean, how …
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Compiling my own SPARC CPU inside a cheap FPGA
Compiling a CPU, in a cheap FPGA board
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Stupid Unix Tricks
These are my stupid unix tricks. I hope that they are useful to you. Platform Note I use Mac OS X (pron: “ten”). If you don’t, you might want to switch…
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Books: an immutable double-entry accounting database service
Tracking financial transactions at scale
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Mu: A minimal hobbyist computing stack
Over the past year I've been working on a minimal-dependency hobbyist computing stack (everything above the processor) called Mu . The goal is to:
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Mispredicted branches can multiply your running times
Modern processors are superscalar, meaning that they can execute many instructions at once. For example, some processors can retire four or six instructions per cycle. Furthermore, many of these processors can initiate instructions out-of-order: they can start working on instructions that appear much later in the…
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Beating Decades of Optimized C with 80 Lines of Haskell
The Personal blog and musings of Chris Penner, a designer, developer and future opsimath.
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Making the Tokio scheduler 10x faster
Tokio is a runtime for writing reliable asynchronous applications with Rust. It provides async I/O, networking, scheduling, timers, and more.
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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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Mail Data Loss in macOS 10.15
I’m working on more posts about the Catalina release, but I wanted to start with a short warning. I’ve heard a bunch of reports of data loss in Apple Mail. Thankfully, none seem to be caused by my apps . (Ironically, one of the bugs I’ve encountered is the inability to delete messages via AppleScript.) And, in fact…
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SerenityOS: From Zero to HTML in a Year
The Serenity operating system turns 1 year old today. I'm counting from the first commit in the git repository , on October 10, 2018. Parts of the code had been around for a while before that, so this first commit was really about putting everything I was tinkering with into a shared repo.
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The PDP-7 Where Unix Began
Serial Number of First Unix System In preparation for a talk on Seventh Edition Unix this fall, I stumbled upon a service list from DEC fo...
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VxWorks now with C++17 and Rust support, alongside Ada and SPARK
Wind River announces Wind River Professional Services has been appraised at Level 3 of the CMMI® Institute’s Capability Maturity Model Integration.
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Guix Reduces Bootstrap Seed by Half
Blog posts about GNU Guix.
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Collapse OS — Bootstrap post-collapse technology
I expect our global supply chain to collapse before we reach 2030. With this collapse, we won't be able to produce most of our electronics because their production depends on a very complex supply chain that we won't be able to achieve again for decades (ever?).
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Why isn't my time zone highlighted on the world map?
In the original release of Windows 95, you could change your time zone by clicking on the map, and the time zone you selected would highlight. Similarly,
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