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New
The latest blog posts to take off on Hacker News. 582 posts.
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Using Rust to Scale Elixir for 11 Million Concurrent Users
The Backend Infrastructure team at Discord was hard at work improving the scalability and performance of our core real-time communications infrastructure.
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AWS Graviton vs. M1 vs. M1 Pro Node.js Benchmarks
I am lucky in that I have a few side projects which have grown up to become full fledged companies. One of them builds little tools to detect different types of financial crime.
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Another Vulnerability in the LPC55S69 ROM
The discovery of an undocumented hardware block in the LPC55S69.
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Problems with “graceful shutdown” in Kubernetes (2019)
Grace is overrated
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Lanai, the mystery CPU architecture in LLVM
Disclaimer: I have had access to some confidential information about some of the matter discussed in this page. However, everything written here is derived form publicly available sources, and references to these sources are also provided.
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Using a Minitel 1B as a serial terminal
So you've got your hands on a late 1980s Minitel 1B (or something slightly later) and then you realize that the entire Minitel network shut ...
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When Apple Built a Mac OS Running on Top of Solaris and HP-UX
Macintosh Application Environment for Unix -- from back in 1994.
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Asahi Linux alpha release
Porting Linux to Apple Silicon
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Random number generator enhancements for Linux 5.17 and 5.18
The random number generator has undergone a few important changes for Linux 5.17 and 5.18, in an attempt to modernize both the code and the cryptography used. The smaller part of these will be released with 5.17 on Sunday, while the larger part will be merged into 5.18 on Monday, which should receive its first release…
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Hot-code reloading on macOS/arm64 with Zig
Jakub Konka's weblog about programming, game theory, maths, and more.
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MySQL now shows its thread names at OS level for better troubleshooting
Starting from v8.0.27, the MySQL daemon shows its thread names at the OS level too, for better troubleshooting. The MySQL 8.0.27 release notes say this: To assist monitoring and troubleshooting, the Performance Schema instrumentation is now used to export names of instrumented threads to the operating system. This…
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Continental Europe successfully synced with Ukraine and Moldova power systems
Following an urgent request by Ukrenergo and Moldova for emergency synchronisation, the TSOs of Continental Europe agreed to start on 16 March 2022 the trial synchronisation of the Continental European Power System with the power systems of Ukraine and Moldova. This acceleration of the synchronisation project ongoing…
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Update Firmware of Samsung SSDs in Linux
Firmware flash Samsung SSD or NVMe directly from Linux without needing broken Samsung ISO boot environment!
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What is: Linux keyring, gnome-keyring, Secret Service, and D-Bus (2019)
What are Linux keyring, gnome-keyring, Secret Service, and D-Bus - a brief overview and usage examples
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Oxide at Home: Propolis Says Hello
So Oxide is making some cool stuff huh? Big metal boxes with lots of computer in them. Servers as they should be! Too bad I can’t afford to buy one for myself… but wait, they’re open-sourcing the software they’re writing to do it. Mom said we can have Oxide at Home!
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ZFS on a single core RISC-V hardware with 512MB
Is this feasible? Yes it is! OpenZFS on Linux compiled from sources for RISC-V, it will work with less than 250MB of RAM for a nearly fully filled 2TB zfs volume with 225.000 files! Even stressing the system and run in parallel (via Wifi): a…
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Filesystems can experience at least three different sorts of errors
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…
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FoundationDB: A distributed unbundled transactional key value store
This paper from Sigmod 2021 presents FoundationDB, a transactional key-value store that supports multi-key strictly serializable transacti...
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Put an io_uring on it: Exploiting the Linux kernel
How much do you know about system calls and how they introduce security risks? We shed light on these interactions and how security teams monitor them.
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The AMD Branch (Mis)Predictor Part 2: Where No CPU Has Gone Before
In this blog post, OSS Security Researcher Pawel Wieczorkiewicz shares his journey from trying to save one byte of code to the discovery of two new cases of Straight-Line-Speculation (SLS) which affect the Zen1 and Zen2 microarchitectures of AMD CPUs. Using the findings presented in his earlier blog on the AMD branch…
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The most important thing to understand about queues (2016)
You only need to learn a little bit of queueing theory before you start getting that ecstatic “everything is connected!” high that good math always evokes. So many damn things follow th…
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A new speed milestone for Chrome
Everyday, billions of people around the world turn to Chrome to get things done quickly on their devices, whether shopping for a new pair o...
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Request Coalescing in Async Rust
As the popular saying goes, there are only two hard problems in computer science: caching, off-by-one errors, and getting a Rust job that isn’t cryptocurrency-related. Today, we’ll discuss caching!...
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Windows Defender is enough, if you harden it
This article is not intended to convince you to abandon your current antivirus solutions. In this post I would like to share my observations and ways to improve the effectiveness of Defender. You don’