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The latest blog posts to take off on Hacker News. 458 posts.
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ReactOS 0.4.9 released
ReactOS is a free, opensource reimplementation of windows
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NetBSD 8.0 released
The NetBSD Project is pleased to announce NetBSD 8.0, the sixteenth major release of the NetBSD operating system.
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Exploring .NET Core platform intrinsics: Part 4 – Alignment and pipelining
You’ve implemented some of your performance critical code using the new platform intrinsics API. The code is now running 10x or even 100x faster than before, and you might think that it can’t get any faster. This post will show you some less obvious (but almost universally applicable) techniques for improving the…
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Into the Borg – SSRF inside Google production network
Intro - Testing Google Sites and Google Caja In March 2018, I reported an XSS in Google Caja, a tool to securely embed arbitrary html/javascript in a webpage. In May 2018, after the XSS was fixed, I r
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Command-line apps with Clojure and GraalVM: 300x better startup times
I am a fond Clojure user, and love to use it for both server-side projects and small command-line tools. I love its expressivity and concision, and I like th...
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Geosharded Recommendations with Hilbert Curve at Tinder
We’re on a mission to keep the magic of human connection alive. Learn more about life at Tinder and the many ways we're igniting our impact—for our employees and the millions of people seeking connection on our app.
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Inside the Windows Console
Welcome to the third post in the Windows Command-Line series. In this post, we'll start to dig into the internals of the Windows Console and Command-Line, what it is, what it does ... and what it doesn't do!
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Amazon EC2 Instance Update – Faster Processors and More Memory
Last month I told you about the Nitro system and explained how it will allow us to broaden the selection of EC2 instances and to pick up the pace as we do so, with an ever-broadening selection of compute, storage, memory, and networking options. This will allow us to give you access to the latest […]
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Linux touchpad like a Macbook: goal worth pursuing?
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Almost booting an iOS kernel in QEMU
I tried to boot an iOS 12 kernelcache in QEMU: I managed to get as far as IOKit startup before receiving a kernel panic. I learned a lot about how iOS boots up with this project.
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Supercharging the Git Commit Graph IV: Bloom Filters
We've been discussing the commit-graph feature in Git 2.18 and how we can use generation numbers to accelerate commit walks. One area where we can get
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Differential Synchronization (2009)
Keeping two or more copies of the same document synchronized with each other in real-time is a complex challenge. This paper describes the differential synchronization algorithm. Differential synchronization offers scalability, fault-tolerance, and responsive collaborative editing across an unreliable network.
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Mitigating Spectre with Site Isolation in Chrome
Posted by Charlie Reis, Site Isolator Speculative execution side-channel attacks like Spectre are a newly discovered security risk for web...
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Basics of Futexes
The futex (short for "Fast userspace mutex") mechanism was proposed by Linux contributors from IBM in 2002 [1] ; it was integrated into the kernel in late 2003. The main idea is to enable a more efficient way for userspace code to synchronize multiple threads, with minimal kernel involvement.
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XARs: An efficient system for self-contained executables
Distributing large pieces of software to thousands of machines with a wide variety of configurations can pose a significant operational challenge, requiring a process to identify and copy precisely…
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AMD EPYC Performance Testing with systemd
With packet.net making bare metal servers available to cloud users, Percona CTO Vadim Tkachenko enjoys the opportunity to carry out some performance benchmarks with EPYC CPU, and experiences some surprising results running Percona Server for MySQL under systemd.
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Netdev Day 1: IPsec
netdev day 1: IPsec!
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How to Analyze Billions of Records per Second on a Single Desktop PC
Introduction This article gives an overview of LocustDB [1], a new and extremely fast open-source analytics database built in Rust. Part 1 gives some background on analytical query systems and my g…
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The Effects of CPU Turbo: 768X Stddev
I build and maintain smf - the fastest RPC in the west.The main language supported is C++. We use Seastar asthe actual asynchronous framework.
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Making a low level Linux debugger, part 3: our first program
This continues a series where we make a debugger and live editor for (re)creating assembly and C programs.
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Improving the fast inverse square root (2010)
Remember that famous hack for approximating y = x −1/2 from Quake III? It goes like this:
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How to drop 10M packets per second
Internally our DDoS mitigation team is sometimes called "the packet droppers". When other teams build exciting products to do smart things with the traffic that passed through our network, we take joy in discovering novel ways of discarding it.
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An extensive ZFS setup on MacOS
DISCLAIMER: If you are in no way familiar or comfortable with the Terminal, this is not for you.
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Walkthrough for Systemd Portable Services
Posts and writings by Lennart Poettering