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Upgrading the soldered-on RAM of a Dell XPS13 7390 laptop
I’d recently bought a new XPS13 7390 (non 2-in-1) laptop. I had bought the 8GB variant, how hard could it be to upgrade?
New
The latest blog posts to take off on Hacker News. 553 posts.
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What every IT person needs to know about OpenBSD Part 3: That packet filter
Useful and fun features related to the OpenBSD packet filter.
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Demystifying OpenZFS 2.0
Explore the changes and reasons behind OpenZFS 2.0. This article clarifies the transition from feature flags and its impact on FreeBSD 13.
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Debugging a Linux network stack crash via a single register value
It’s not every day that you get to debug what may well be a packet of death. It was certainly the first time for me. What do I mean by “a packet of death”? A software bug where the network stack crashes in reaction to a single received network packet, taking down the whole operating system with it.
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New and improved Linux Random Number Generator ready for testing
We enable the world to secure the web. Burp Suite, the Web Security Academy, and world-leading research from PortSwigger — the AppSec community’s home.
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Prefix sum on portable compute shaders
This is a followup to my previous post, prefix sum on Vulkan. Last year, I got a fancy algorithm for this problem running well on one device. This time, I will dive into the question of how to make it work well across a wide range of devices. The short answer is, it can be made to work pretty portably on Vulkan and…
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Rust on MIPS64 Windows NT 4.0
Introduction
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Signals and Threads Podcast
Listen in on Jane Street’s Ron Minsky as he has conversations with engineers working on everything from clock synchronization to reliable multicast, build systems to reconfigurable hardware. Get a peek at how Jane Street approaches problems, and how those ideas relate to tech more broadly.
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T-Wand: beating Lucene in less than 600 lines of code
The design of Datalevin's compact Clojure search engine, its T-Wand algorithm, and the full-text search benchmarks comparing it with Apache Lucene.
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How to Write a Computer Emulator
I wrote this document after receiving large amounts of email from people who would like to write an emulator of one or another computer but do not know where to start. Any opinions and advices contained in the following text are mine alone and should not be taken for an absolute truth. The document mainly covers…
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Monterey’s memory leak and how to avoid it
How this memory leak probably occurs, which apps it affects, and what you can do to avoid it completely.
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Debugging memory corruption: who the hell writes “2” into my stack? (2016)
Several weeks ago we received a bug report from a customer that said their game was crashing when using IL2CPP scripting backend. QA verified the bug and assigned it to me for fixing. The project was quite big (although far from the largest ones); it took 40 minutes to build on my machine. The instructions on the bug…
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I'm unsure of the security of simultaneous multithreading on modern x86 CPUs
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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The Rust compiler has gotten faster again
I worked on Rust part-time for several years at Mozilla. During that period I regularly summarized how the compiler’s performance had improved. For example: 2017-11-12 to 2019-07-24.
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Make your monorepo feel small with Git’s sparse index
The new sparse index feature makes it feel like you are working in a small repository when working in a focused portion of a monorepo.
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We saved millions in SSD costs by upgrading our filesystem
During COVID we experienced rapid growth in the amount of data we ingest. This post details some of the problems this caused us and how we solved them.
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WSL2 can now mount Linux ext4 disks directly
If you're on a version of Windows 11 that is build 22000 or greater, you can ...
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The LZ4 introduced in PostgreSQL 14 provides faster compression
Haiying Tang takes you on a tour of LZ$ TOAST, the new column opton compression in PostgreSQL 14, and shows the speed and compression ratio gains.
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From macOS to Arch Linux
First impressions
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A 1958 UNIVAC airline reservation system
I had thought that SABRE, a joint development of IBM and American Airlines, was the first computerized airline reservation system, going live in 1960. However, “The Univac Air […]
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M1 Pro First Impressions: Core Management and CPU Performance
The P cores in the M1 Pro/Max CPU are managed in two groups of four, sparing load on the second group, and distributing it unevenly within each group. Its two E cores outperform the four in the M1 …
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The surprising subtleties of zeroing a register (2012)
Zeroing out a CPU register seems like the simplest and most basic operation imaginable, but in fact x86 CPUs contain a surprising amount of special logic to make this operation run smoothly. The mo…
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Linux x86 program start up – How the heck do we get to main()? (2011)
This is for people who want to understand how programs get loaded under linux. In particular it talks about dynamically loaded x86 ELF files. The information you learn will let you understand how to debug problems that occur in your program before main starts up. Everything I tell you is true, but some things will be…
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Amazon Time Sync Service
Discover more about what's new at AWS with Amazon Time Sync Service now makes it easier to generate and compare timestamps
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How X Window Managers Work, and How to Write One (2014)
How X Window Managers Work, And How To Write One (Part I)
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The Common Desktop Environment (CDE) in 2021
Published: 28-01-2021 | Author: Remy van Elst | Text only version of this article
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Apple Silicon Macs can't boot from external drive if internal drive failed
CCC 5.1.27 and CCC 6 can make bootable copies of the system on Intel and Apple Silicon Macs (11.3+) right now, and we'll continue to support that functiona...