Head-of-Line Blocking in QUIC and HTTP/3: The Details
Robin Marx is a Web Performance and network protocol researcher at Hasselt University, Belgium. He is mainly looking into HTTP/3 and QUIC performance, and develops the qlog and qvis tools to make this easier. In a previous life he was a multiplayer game programmer and co-founder of LuGus Studios. YouTube videos of Robin are either humoristic technical talks or him hitting other people with longswo
Biome v1.6
In this release, we’re happy to provide partial support for Astro, Svelte and Vue files. What does partial support mean? While the team is working on a unified data structure for HTML-ish languages, we discovered that we could provide Biome functionalities to those files with just a few changes, albeit with some limitations. This means that Biome is able to analyze the JavaScript/TypeScript portio
EngineeringOpen SourceMake your monorepo feel small with Git’s sparse indexThe new sparse index feature makes it feel like you are working in a small repository when working in a focused portion of a monorepo. One way that Git scales to the largest monorepos is the sparse-checkout feature, which allows you to focus on a subset of the files. This is supposed to make it feel like you are actually in
5 modern alternatives to essential Linux command-line tools
In addition, htop provides system overview information at the top and a command bar at the bottom to trigger commands using the function keys, and you can customize it by pressing F2 to enter the setup screen. In setup, you can change its colors, add or remove metrics, or change display options for the overview bar. While you can configure recent versions of top to achieve similar results, htop pr
Understanding Garbage Collection in JavaScriptCore From Scratch
JavaScript relies on garbage collection (GC) to reclaim memory. In this post, we will dig into JSC’s garbage collection system. Before we start, let me briefly introduce myself. I am Haoran Xu, a PhD student at Stanford University. While I have not yet contributed a lot to JSC, I found JSC a treasure of elegant compiler designs and efficient implementations, and my research is exploring ways to tr
——————————————————————————————————————————————————— Redis(REmote DIrectory Server)Redisは例えば以下の特徴を持つLLOOGGを元としたインメモリの非リレーショナルのデータベースです。 String, List, Hash, Set, Sorted Setに代表される豊富なデータ型シングルスレッド処理イベント駆動処理 by aeライブラリ通常RESPプロトコルによるクライアント/サーバーモデルでリクエスト/レスポンスデータは条件を満たす場合にメモリ最適化されて保存。CPUとのトレードオフRAXを利用したメモリ利用量の最適化(Redis 4.0~)この記事では、入門から始まり、実装をより意識することで深く理解することを目標としています。 以下の説明中の(*)マークは、特にVanilla Redisでの話となり
Back to articlesOnyx, a new programming language powered by WebAssemblyLearn about Onyx, a new imperative programming language that leverages WebAssembly and Wasmer for seamless cross-platform support What is Onyx? Onyx is a new programming language featuring a modern, expressive syntax, strict type safety, blazingly-fast build times, and out-of-the-box cross platform support thanks to WebAssembly
At Stripe, our product docs are designed to feel like an application rather than a traditional user manual. For example, we incorporate a user's own API test key into code samples, making it possible to copy and paste code that seamlessly works with the user's own account. We have client-side interactivity, like checklists and collapsible sections. We tailor the content to the individual user, con
Photo by timJ on UnsplashIn this article, we will see how to structure a Rust project so that it’s easily testable. We will build a simple authentication module that is exposed via REST API while storing the data to PostgreSQL and Redis. We will use actix-web for handling the REST API part, sqlx for interacting with PostgreSQL, and redis-rs for interacting with Redis. We will see how the applicati
Debug Visualizer - Visual Studio Marketplace
Launch VS Code Quick Open (Ctrl+P), paste the following command, and press enter. Debug Visualizer A VS Code extension for visualizing data structures while debugging. Like the VS Code's watch view, but with rich visualizations of the watched value. Visualization Playground Click here to explore all available visualizations. Supported Languages See demos for demos. These languages and debuggers ar
Python open source libraries for scaling time series forecasting solutions
By Francesca Lazzeri. This article is an extract from the book Machine Learning for Time Series Forecasting with Python, also by Lazzeri, published by Wiley. In the first and second articles in this series, I showed how to perform feature engineering on time series data with Python and how to automate the Machine Learning lifecycle for time series forecasting. In this third and concluding article,
Opens in a new windowOpens an external siteOpens an external site in a new window Shopify and YJIT Back in July 2020, I joined the Ruby & Rails Infrastructure (R&RI) team at Shopify. Our team focuses on making sure that Ruby as well as Ruby on Rails, central to the infrastructure behind all Shopify stores and much of the modern web, run as smoothly and efficiently as possible. As part of the R&RI
Chapter 12 - Introducing Non-Abstract Large System Design, Google SRE Book
Introducing Non-Abstract Large System Design By Salim Virji, James Youngman, Henry Robertson, Stephen Thorne, Dave Rensin, and Zoltan Egyed with Richard Bondi With responsibilities that span production operations and product engineering, SRE is in a unique position to align business case requirements and operational costs. Product engineering teams may not be aware of the maintenance cost of syste
エアプにならないために、実際に moonbit を使ってコードを書いてみた感想を書く。 JSON Parser を書いた パッケージレジストリである https://mooncakes.io を見た限り、使いやすい json parser がなさそうなので、とりあえず自分用のをでっち上げた。 mooncakes.io に publish してあるので、 moon add mizchi/json で使える。品質が良くなくても ネームスペース付きで publish するので別に邪魔にならない気がした。 なんで作ったかというと、公式 example の cloudflare workers の example は単純なフィボナッチを計算するだけで、構造的なデータを返すことができない。 moonbit と js 間の文字列の受け渡しについては、あとで別の記事を書く。 使い方 fn main { l
Highlights from Git 2.33
Open SourceHighlights from Git 2.33The open source Git project just released Git 2.33, with features and bug fixes from over 74 contributors. Here's a look at some of the most interesting features and changes. The open source Git project just released Git 2.33 with features and bug fixes from over 74 contributors, 19 of them new. We last caught up with you on the latest in Git when 2.31 was releas
During my final term at UWaterloo I took the CS444 compilers class with a project to write a compiler from a substantial subset of Java to x86, in teams of up to three people with a language of the group’s choice. This was a rare opportunity to compare implementations of large programs that all did the same thing, written by friends I knew were highly competent, and have a fairly pure opportunity
GitHub - richardanaya/tour_of_rust: A tour of rust's language features
This project is meant to give an experienced programmer a swift introduction to Rust as an alternative to reading lengthy book style documentation. Chapter 1 - The Basics Chapter 2 - Basic Control Flow Chapter 3 - Basic Data Structure Types Chapter 4 - Generic Types Chapter 5 - Ownership & Borrowing Data Chapter 6 - Text Chapter 7 - Object Oriented Programming Chapter 8 - Smart Pointers Chapter 9
TCP SACK PANIC - Kernel vulnerabilities - CVE-2019-11477, CVE-2019-11478 & CVE-2019-11479 - Red Hat Customer Portal
Executive SummaryThree related flaws were found in the Linux kernel’s handling of TCP networking. The most severe vulnerability could allow a remote attacker to trigger a kernel panic in systems running the affected software and, as a result, impact the system’s availability. The issues have been assigned multiple CVEs: CVE-2019-11477 is considered an Important severity, whereas CVE-2019-11478 an
Golang Mini Reference 2022: A Quick Guide to the Modern Go Programming Language (REVIEW COPY)
Golang Mini Reference 2022 A Quick Guide to the Modern Go Programming Language (REVIEW COPY) Harry Yoon Version 0.9.0, 2022-08-24 REVIEW COPY This is review copy, not to be shared or distributed to others. Please forward any feedback or comments to the author. • feedback@codingbookspress.com The book is tentatively scheduled to be published on September 14th, 2022. We hope that when the release da
データ指向アプリケーションデザインを読んでLSM-treeインデックスに基づくKVSを作る - 油そば
この記事はMicroAd Advent Calendar 2019の4日目の記事です。 qiita.com はじめに どういうKVSを作るか 手始めにログベースのKVS 書き込み, 読み取り, 削除 ログフォーマットの決定 実装 LSM-treeインデックスを持つKVSを実装する 書き込み MemTableからSSTableの生成 SSTableの反映 SSTableのマージとコンパクション バッファを使ったマージ&コンパクション ステップ1. SSTable毎にキーを読み出す ステップ2. バッファ内の最小のキーの最新の値を読み出す 再起動時の復元 アクターで組み立てる 書き込みのケース 読み取りのケース コード はじめに データ指向アプリケーションデザインは今年買って読んだ技術書の中で最も読み応えがあった本でした。 www.oreilly.co.jp 単に周回で読むだけでも学びが多い本
Rust is an appealing language for building user interfaces for a variety of reasons, especially the promise of delivering both performance and safety. However, finding a good architecture is challenging. Architectures that work well in other languages generally don’t adapt well to Rust, mostly because they rely on shared mutable state and that is not idiomatic Rust, to put it mildly. It is sometim
Testing sync at Dropbox
…and how we rewrote the heart of sync with confidence. Executing a full rewrite of the Dropbox sync engine was pretty daunting. (Read more about our goals and how we made the decision in our previous post here.) Doing so meant taking the engine that powers Dropbox on hundreds of millions of user’s machines and swapping it out mid-flight. To pull this off, we knew we would need a serious investment
npm Blog Archive: npm v7 Series - Beta Release! And: SemVer-Major Changes in npm v7
The npm blog has been discontinued. Updates from the npm team are now published on the GitHub Blog and the GitHub Changelog. << Why keep package-lock.json? A new beta version of npm appears! tl;dr - Run npm i -g npm@next-7 right now, and tell us about any problems you encounter with it. This is a big one, you’re going to want to check it out. As with any beta software, it’s likely to still have a
You should always use Web Workers. And in our current landscape of frameworks it’s virtually impossible. Did I get your attention with that? Good. Of course, as with any topic, there is nuance and I will lay that all out. But I have opinions, and they are important. Buckle up. The Performance Gap is widening Note: I hate the “emerging markets” terminology, but to makes this blog post intuitive to
Introducing Danfo.js, a Pandas-like Library in JavaScript
A guest post by Rising Odegua, Independent Researcher; Stephen Oni, Data Science Nigeria Danfo.js is an open-source JavaScript library that provides high-performance, intuitive, and easy-to-use data structures for manipulating and processing structured data. Danfo.js is heavily inspired by the Python Pandas library and provides a similar interface/API. This means that users familiar with the Panda
Why Rust strings seem hard April 13, 2021 Lately I've been seeing lots of anecdotes from people trying to get into Rust who get really hung up on strings (&str, String, and their relationship). Beyond Rust's usual challenges around ownership, there can be an added layer of frustration because strings are so easy in the great majority of languages. You just add them together, split them, whatever!
This is a blog about our development of Unexplored 2: The Wayfarer's Legacy. This game features state-of-the-art content generation, generative storytelling, emergent gameplay, adaptive music, and a vibrant art style. The content generator of Unexplored 2 generates tile maps. Typical output looks like this (you can read more about our level generator here? These tile maps are stacked, using differ
Register now for a full day of community, learning, and all things Visual Studio Code April 2022 (version 1.67) Update 1.67.1: The update addresses this security issue. Update 1.67.2: The update addresses these issues. Downloads: Windows: x64 Arm64 | Mac: Universal Intel silicon | Linux: deb rpm tarball Arm snap Welcome to the April 2022 release of Visual Studio Code. There are many updates in thi
A recent blog post explored how TypeScript enums work. In this blog post, we take a look at alternatives to enums. Unions of singleton values # An alternative to creating an enum that maps keys to values, is to create a union of singleton types (one per value). Read on to see how that works. Unions of string literal types # Let’s start with an enum and convert it to a union of string literal typ
AST vs. Bytecode: Interpreters in the Age of Meta-Compilation
233 AST vs. Bytecode: Interpreters in the Age of Meta-Compilation OCTAVE LAROSE, University of Kent, UK SOPHIE KALEBA, University of Kent, UK HUMPHREY BURCHELL, University of Kent, UK STEFAN MARR, University of Kent, UK Thanks to partial evaluation and meta-tracing, it became practical to build language implementations that reach state-of-the-art peak performance by implementing only an interprete
Preparing for the Systems Design and Coding Interview
At Big Tech and high-growth startups, coding and systems design interviews are common - and fairly standard. A lot of people have asked me for preparation advice for these. Here is what I used when getting ready for an E5/E6 Facebook interview, and the one at Uber - where I was hired as a senior software engineer (L5). It's the same resources I recommend to people who are preparing for Big Tech or
We’re happy to announce the initial public work on GraalWasm — the WebAssembly engine implemented in GraalVM. GraalWasm currently implements the WebAssembly MVP (Minimum Viable Product) specification, and can run WebAssembly programs in the binary format, generated with compiler backends such as Emscripten. Supporting WebAssembly expands the set of languages GraalVM can execute with a whole other
MemLab: An open source framework for finding JavaScript memory leaks
MemLab: An open source framework for finding JavaScript memory leaks We’ve open-sourced MemLab, a JavaScript memory testing framework that automates memory leak detection. Finding and addressing the root cause of memory leaks is important for delivering a quality user experience on web applications. MemLab has helped engineers and developers at Meta improve user experience and make significant imp
Programming interviews can be a great learning experience for interviewers as well as interviewees. In fact, I recently had the opportunity to learn something new about Rust while interviewing an engineering candidate. Background About our Interview ProcessAt OneSignal, we don't believe in handing someone a problem and watching them flounder with zero autocomplete and zero docs. Engineers who appl
This blog tries to summarize all the choices and paths you could take to implement your next programming language, more specifically the frontend for your language. There are a lot of factors that will influence your choices. Maybe you have your favorite host language that you would like to use for implementing your language, whether your language is dynamically or statically typed, or you are des
ディメンショナル・モデリング
VOYAGE GROUP Techlog Advent Calendar 2020 13日目 ディメンショナル・モデリングとは ディメンショナル・モデリング Wikipediaには以下のような説明がある。 Dimensional Modeling (DM) is a data structure technique optimized for data storage in a Data warehouse. データウェアハウスにデータを格納するために、最適化されたデータ構造の手法。 背景 情報システムは2つの大きなカテゴリに分類される。1つはビジネスプロセスの実行支援する業務システム、もう1つはビジネスプロセスを分析支援する分析システム。それぞれ根本的に異なる目的があるため、異なる原則に基づき設計が進化してきた。 業務システムの目的は、ビジネスプロセスで発生した重要な事実や行動を記録する
How to speed up the Rust compiler one last time – Nicholas Nethercote
Due to recent changes at Mozilla my time working on the Rust compiler is drawing to a close. I am still at Mozilla, but I will be focusing on Firefox work for the foreseeable future. So I thought I would wrap up my “How to speed up the Rust compiler” series, which started in 2016. Looking back I wrote ten “How to speed up the Rust compiler” posts. How to speed up the Rust compiler.The original pos
eBPF and XDP for Processing Packets at Bare-metal Speed - Sematext
XDP or Express Data Path arises due to the pressing need for high-performance packet processing in the Linux kernel. Several kernel bypass techniques (DPDK being the most prominent one) aim to accelerate network operations by moving packet processing to user space. This means ditching the overhead induced by context switches, syscall transitions or IRQ requests between the kernel-user space bounda
A decision that arises over and over when designing concurrent programs is whether to represent program state in control flow or as data. This post is about what that decision means and how to approach it. Done well, taking program state stored in data and storing it instead in control flow can make programs much clearer and more maintainable than they otherwise would be. Before saying much more,
Rust is becoming a first class language in a variety of domains. At Discord, we’ve seen success with Rust on the client side and server side. For example, we use it on the client side for our video encoding pipeline for Go Live and on the server side for Elixir NIFs. Most recently, we drastically improved the performance of a service by switching its implementation from Go to Rust. This post expla
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Make your monorepo feel small with Git’s sparse index
Dive Deep Redis ~ 入門から実装の確認まで - hayashier Tech Blogs
Onyx, a new programming language powered by WebAssembly
How Stripe builds interactive docs with Markdoc
Structuring Rust Project for Testability
Ruby 3.2’s YJIT is Production-Ready
moonbit で json パーサーを書いてみた 感想
Comparing the Same Project in Rust, Haskell, C++, Python, Scala and OCaml - Tristan Hume
Xilem: an architecture for UI in Rust
When should you be using Web Workers? — surma.dev
Why Rust strings seem hard | Brandon's Website
Tiles to Curves: Fun With Voronoi Graphs (part 1)
Visual Studio Code April 2022
Alternatives to enums in TypeScript
Announcing GraalWasm — a WebAssembly engine in GraalVM
Understanding Rust Thread Safety
The path to implementing a programming language
research!rsc: Storing Data in Control Flow
Why Discord is switching from Go to Rust