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We replaced Firecracker with QEMU
Firecracker is not the best choice for all kinds of workloads.
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The latest blog posts to take off on Hacker News. 555 posts.
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Wayland on OpenBSD
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273
How small is the smallest .NET Hello World binary?
Here is a dumb question that you probably never asked yourself: What is the minimal amount of bytes we need to store in a .NET executable to have the CLR print the string"Hello, World!" to the standard output?
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{n} times faster than C
Owen's personal website and portfolio
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Simple Unix Chat
The title oversells the content a bit 1 1: Some called it disingenous dickish clickbait. I don't disagree ;-) :
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Hunting for Nginx alias traversals in the wild
Research beyond the obvious
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Things that surprised me while running SQLite in production
I've been using SQLite in several production projects for six months, and I've encountered some surprising aspects.
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Are You Sure You Want to Use MMAP in Your Database Management System? (2022)
MMAP Databases = 💩
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Parsing time stamps faster with SIMD instructions
In software, it is common to represent time as a time-stamp string. It is usually specified by a time format string. Some standards use the format %Y%m%d%H%M%S meaning that we print the year, the month, the day, the hours, the minutes and the seconds. The current time as I write this blog post would be … Continue…
281
Flattening ASTs and other compiler data structures
This is an introduction to data structure flattening, a special case of arena allocation that is a good fit for programming language implementations. We build a simple interpreter twice, the normal way and the flat way, and show that some fairly mechanical code changes can give you a 2.4× speedup.
282
Twitter bug causes self-DDoS, related to Musk’s emergency blocks, rate limits
An "amateur hour" Javascript bug is self-DDOSing Twitter, sending infinite requests from users related to — or possibly even causing — Elon Musk's "temporary emergency measures" to stop web scraping.
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How does Linux handle writes?
I examine the somewhat surprising way how Linux handles writes.
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Wayland is pretty good
I started working on Flyaway with the intention of becoming familiar with Wayland, its protocols and extensions, and the wlroots library. Instead, I ended up genuinely liking all three.
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Structures in C: From Basics to Memory Alignment
Structures allow us to combine several variables to create a new data type. Some other languages support the same concept but call it “records”. If you come from object-oriented program…
286
Fast machines, slow machines
Well, that was unexpected. I recorded a couple of crappy videos in 5 minutes, posted them on a Twitter thread, and went viral with 8.8K likes at this point. I really could not have predicted that, given that I’ve been posting what-I-believe-is interesting content for years and… nothing, almost-zero interest. Now that…
287
FreeBSD Jails Containers
FreeBSD networking and containers (Jails) stacks are very mature and provide lots of useful features … yet for some reason these features are not properly advertised by the FreeBSD project &#…
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I Built Linux from Scratch
Linux From Scratch or LFS is a project that provides and maintains a set of instructions of how to build your own Linux system from scratch. I am always curious to understand how things work ‘under the hood’, and since I’m a daily Linux user i decided to take on the challenge to try and complete building Linux From…
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macOS command-line tools you might not know about
A comprehensive reference for advanced command-line utilities that provide unique macOS functionality.
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Optimizing a ring buffer for throughput (2021)
In this article I will take a look at the classic concurrent ring buffer and how it can be optimized to increase throughput.
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Build your own Docker with Linux namespaces, cgroups, and chroot
Take a practical approach to containerization as we guide you through the step-by-step process of building your own Docker-like environment using Linux namespaces, cgroups, and chroot. Dive into the code and command examples to gain a deeper understanding of how these technologies work together to create isolated and…
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Time is not a synchronization primitive
Xe Iaso's personal website.
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Make your programs run faster by better using the data cache (2020)
We investigate how the data cache influences the performance of your program, talk about ways for you to write faster programs by better leveraging the data cache.
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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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Linux Namespaces Are a Poor Man's Plan 9 Namespaces
A blog about free software and programming
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Filenames and pathnames in shell: How to do it correctly (2020)
This article explains how to correctly handle filenames in Bourne shells (the primary shell of Unix/Linux/POSIX systems), based on the issues discussed in 'Fixing Unix/Linux/Filenames'. Many programs fail to work properly on filenames that include spaces, begin with dash (-), include newlines, and so on, because…
297
Building a Networked Key-Value-Store on an FPGA
This post is about building an FPGA based networked key-value-store in the functional hardware description language Clash. I’ll describe my FPGA-tailored hashtable design, the testing framework I built for it, and its performance and resource usage.
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The legend of “x86 CPUs decode instructions into RISC form internally” (2020)
A dive into what x86 instruction are decoded into various processors, to determine the truth of the idea that they're just RISC-like internally.
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Follow up to “I booted Linux 293k times”
Well that blew up. It was supposed to be just a silly off-the-cuff comment about how some bugs are very tedious to bisect. To answer a few questions people had, here’s what actually happened.…
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Put an io_uring on it – Exploiting the Linux Kernel (2022)
Put an io_uring on it - Exploiting the Linux Kernel - chompie at the bits