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Message-Oriented Programming (2017)
Managing complexity within an application is one of the key challenges for any software developer. Cleanly reconciling new features with existing architectures is something we strive for.
Topics /
Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 4,389 posts.
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Fast CI with MicroVMs
I saw an opportunity to fix self-hosted runners for GitHub Actions. Actuated is now in pilot and aims to solve most if not all of the friction.
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OpenBSD, the computer appliance maker's secret weapon
Between our ESP32 prokaryotic organisms and our 24/7 Internet-enabled megafauna servers, there exists a vast and loosely-defined ecosystem of things the B2B world likes to call computer appliances. Picture a bespoke Pi 4 packaged up neatly with some Python scripts, a little fancy plastic embossing, and maybe a…
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Run Windows 2000 on a DEC Alpha with a new es40 fork
Published: 05-07-2026 20:33 | Author: Remy van Elst | Text only version of this article
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The memory remains: Permanent memory with systemd and a Rust allocator
A Rust object that survives program restart thanks to Rust allocators, systemd's file descriptor store, and syscall memfd_create.
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PostgreSQL Benchmark on FreeBSD, CentOS, Ubuntu Debian and OpenSUSE
In this post, I’m going to show benchmark results of the recently released PostgreSQL 10.1. I’ve benchmarked the DB on these OSes (all are 64-bit):
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Simpler Backoff
Exponential backoff with jitter is de rigeur for making service calls. This code, or something like it, probably looks really familiar: func do(ctx context.Context) error { const ( maxAttempts = 10 baseDelay = 1 * time.Second maxDelay = 60 * time.Second ) delay := baseDelay for attempt := range maxAttempts { err :=…
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GPS Time Rollover Failures Keep Happening, But They’re Almost Done
This is week "1111111111" in the GPS system. Tomorrow morning it will roll over to week "0000000000". How well will various systems handle this change? Not well, judging by what we've seen so far!
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Gryadka is not Paxos, so it's probably wrong
In the original version of this post, I claimed that gryadka , which claims to be built on top of a Paxos-backed CAS register, was incorrect by providing a “counter-example”.
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/dev/audio
Software Engineer in Auckland, New Zealand.
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Running Doom on Our Custom CPU and Going Viral
I get kidnapped by the MIG while adding DDR3 to our CPU
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Summing ASCII encoded integers on Haswell at almost the speed of memcpy
“Print the sum of 50 million ASCII-encoded integers uniformly sampled from [0, 2³¹−1], separated by a single new line and sent to standard input.”
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Upgrading my old Chumby 8 Linux kernel
As I mentioned in my last post, I spent a good chunk of my spare time over the past 6 months working on a project I’ve been thinking about for over a decade. I bought a Chumby 8 in 2011. It’s an 8″ touchscreen device powered by the Marvell PXA166 processor. It is essentially a souped-up digital picture frame with…
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Using OpenBSD Relayd(8) as an Application Layer Gateway
I was lucky enough to attend to EuroBSDCon 2023 and offered the opportunity to talk about one of my favorite OpenBSD stock daemon: relayd(8). The talk was recorded and made available on the EuroBSDCon YouTube channel. . One may check the EuroBSDCon 2023 program for more material. This post attempts a reboot of the…
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Linux Pressure Stall Information (PSI) by Example
[Discuss this article and read other’s comments on the subject on this thread on Hacker News.] The three fundamental building blocks of computers, CPU, I/O and RAM can come under pressure due to co…
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Taking a Look at CLR Thread Pool 'Thread Injection' Algorithm
As part of a never-ending quest to explore the CoreCLR source code I stumbled across the intriguing titled ‘HillClimbing.cpp’ source file. This post explains what it does and why.
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68 things the CLR does before executing a single line of your code
Because the CLR is a managed environment there are several components within the runtime that need to be initialised before any of your code can be executed. This post will take a look at the EE (Execution Engine) start-up routine and examine the initialisation process in detail.
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How Dirty COW works from the Linux kernel’s perspective
Dirty COW (CVE-2016-5195) is one of the most publicised local privilege escalation vulnerabilities in 2016, courtesy to its catchy name, cute logo, potential damages, and the fact that it was discovered in the wild by a researcher Phil Oester, meaning it was already under active use at the time of discovery.
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Decomposing Transactional Systems
Every transactional system must execute, order, validate, and persist transactions.
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The Lost Atomic Update on Loongson CPU
杰哥的{教学，运维，编程，调板子}小笔记
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RISC-V Linux on ESP32
I've been playing with the idea of running linux on ESP32 since the first days I've met its more robust module, the WROVER-B, on paper it se...
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Systemd: The Biggest Myths
Posts and writings by Lennart Poettering
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Co-routines as an alternative to state machines (2009)
When you have to traverse some sort of a nested data structure (say, a binary tree), one approach is to create a stack that remembers where in the tree you are. Another, much more elegant approach, is to write the function recursively. A recursive function employs the machine stack used to implicitly implement…