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How to port your OS to EC2 (2018)
You're going to want to make some changes to what goes into that disk image later, but for now just build a disk image.
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The latest blog posts to take off on Hacker News. 553 posts.
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SimpleVisor – Intel VT-x hypervisor in 500 lines of C code
Simplevisor : SimpleVisor is a simple, portable, Intel VT-x hypervisor with two specific goals: using the least amount of assembly code (10 lines), and having the smallest amount of VMX-related code to support dynamic hyperjacking and unhyperjacking (that is, virtualizing the host state from within the host). It runs…
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Extreme HTTP Performance Tuning
This post will walk you through the performance tuning steps that I took to serve 1.2 million JSON 'API' requests per second from a 4 vCPU AWS EC2 instance.
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WebContainers: Run Node.js natively in the browser
Today we're excited to announce WebContainers, a new type of WebAssembly-based operating system that boots instantly and enables Node.js environments to run natively in-browser.
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File Descriptor Limits
Posts and writings by Lennart Poettering
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Improving Firefox stability on Linux
A year ago at Mozilla we started to improve Firefox stability on Linux. This effort quickly became an example of good synergies between FOSS.
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NetBSD 9.2
The NetBSD Project is pleased to announce NetBSD 9.2 "Nakatomi Socrates", the second update of the NetBSD 9 release branch.
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How M1 Macs feel faster than Intel models: it’s about QoS
By segregating macOS background tasks on Efficiency cores, M1 Macs can run user apps unfettered on their Performance cores. And that feels really fast.
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Half a million lines of Go
By Kevin Dangoor Back in December 2019, I first wrote about Goliath, Khan Academy’s project to migrate our ... Read more
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Why Is It So Hard to Detect Keyup Event on Linux?
This article is dedicated to discussing why it's so hard to detect the 'key up' or 'key release' event in a Linux terminal environment without relying on X server. Several techniques and code examples will be shown that are capable of detecting the keyup event on Linux (with and without an X server), but all…
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Debugging random slow writes in PostgreSQL
Understanding & mitigating randomly slow writes in PostgreSQL
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Tried Nvidia’s GTX 1080 – still no external GPU on a Pi
Earlier today I did a livestream on my YouTube channel to attempt using an Nvidia GeForce GTX 1080 on a Raspberry Pi Compute Module 4. As with all my testing, I'm documenting everything I learn in this GitHub issue, which is part of the Raspberry Pi PCI Express Card Database website. It's only been a few hours, but…
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Benchmarking division and libdivide on Apple M1 and Intel AVX512
libdivide is fish ’s library for speeding up integer division by runtime constants. It works by replacing divide instructions with cheaper multiplications and shifts.
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Guix 1.3
Blog posts about GNU Guix.
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Exploring the software that flies SpaceX rockets and starships
Spaceflight, from the beginning, has depended on computers – both on the ground and in the spacecraft. SpaceX has carried it to a new level. We recently spoke with Steven Gerding, Dragon’s software development lead, about the special challenges software development has for SpaceX's many missions.
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The Syslog Hell
Syslog. You’ve probably heard about that, especially if you are into monitoring or security. Syslog is perceived to be the common, unified way that systems can send logs to otherContinue reading
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Apple Silicon Hardware: SPRR and Guarded Exception Levels (GXF)
Over a year ago siguza published a write-up about Apple’s APRR - a custom ARM extension that redefines pagetable permissions and protects certain parts of the kernel from itself. Since then Apple has released their M1 chip which not only features an updated version of APRR but also easily allows to run bare-metal code…
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The Pinecone Overlay Network
Matrix, the open protocol for secure decentralised communications
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Where the top of the stack is on x86 (2011)
I've noticed more than once that some programmers are confused about the direction in which the stack grows on x86, and what "top of the stack" and "bottom of the stack" mean. It appears that this confusion is caused by a basic mismatch in the way people are used to thinking about stacks, and in the way the stack on…
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Faster DISTINCT queries on PostgreSQL
Learn common performance pitfalls and discover techniques to optimize your DISTINCT PostgreSQL queries. Read the full article on the Tiger Data blog.
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Hardening macOS (2018)
Quick and easy guide for securing macOS systems, for both laymen and security enthusiasts. Last updated for Golden Gate.
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Branch predictor: How many “if”s are too many?
Is it ok to have if clauses that will basically never be run? Surely, there must be some performance cost to that...