負荷試験との向き合い方 - スタディサプリ Product Team Blog
こんにちは。SRE の近藤（@chaspy）です。 先日、より高い信頼性でサービスを提供するために、スタディサプリ小中高大のサービスの最後の砦であるデータベース、MongoDB のインスタンスクラスのスケールアップを行いました。また、スケールアップをするにあたり、負荷試験を行いました。 本記事では、データベースインスタンスのスケールアップの際に行なった負荷試験に対する考え方と、得た学びを紹介します。 なぜスケールアップするのか サービスの急成長に伴い、アクセス数もデータ量も増加しています。数年前に「しばらくは大丈夫」と判断できるインスタンスクラスにスケールアップをしたデータベースも、高負荷時には性能が劣化してしまう問題に遭遇しました。 私たちの MongoDB は AWS 上に EC2 インスタンスとしてセルフホストしており、MongoDB Cloud Manager を使って運用の一部を
display=swapとはなにか - MOL
Shipped! @GoogleFonts now let's you control web font loading using font-display. Say hello to the display parameter 🎉 What's font-display? https://t.co/Q7RDeESwkm pic.twitter.com/sn27ySza1B — Addy Osmani (@addyosmani) May 15, 2019 Google I/0 2019に参加してきたのだが、Google Fontsがfont-display: swap;に対応するとかで盛り上がってるのを横目で見てた（5/15の時点で対応済とのこと）。 最近はCSSもなにもコードを書いていないので、世間に疎くて困るのでリハビリする。 The font display timeline 図
The "Developer Experience" Bait-and-Switch - Infrequently Noted
Alex Russell on browsers, standards, and the process of progress. TL;DR: we cannot continue to use as much JavaScript as is now normal and expect the web to flourish. At the same time, most developers experience no constraint on their use of JS...until it's too late. Lightweight, effective tools are here, but we're stuck in a rhetorical rut. We need to reset our conversation about "developer exper
LinuxコアメンバーによるMeltdownとSpectre 対応状況の説明 （1/19更新） - Qiita
はじめに Linuxの安定カーネルのとりまとめ役、グレッグ・クラーハートマンによるメルトダウンとスペクター問題に関する1/6時点での現況の説明の訳文です。 太字は訳者が主観で独自に付加したものです。 2018/1/19: 対応状況がGreg氏によりアップデートされましたので、追記しました。 ライセンス 原文は当人のブログでby-nc-sa3.0で公開されています。 この文章のライセンスも原文に準じます。 謝辞 何よりもまず多忙な中情報をシェアしてくれた原著者のGreg氏に。 表記間違いについて指摘ありがとうございます。以下修正しました。 https://twitter.com/KuniSuzaki/status/950888858568163328 ライセンスの表記間違いを修正しました。ご指摘ありがとうございました。 @7of9 さんより明らかな誤認・誤訳・見落とし箇所への編集リクエストを
dev.toがなぜinsanely fastを実現出来ているか - Qiita
INSANELY FAST Qiitaを読んでる人なら https://dev.to をほとんどの人が見たはず。見てない人は見てきてください、速すぎて驚くはず。またmizchiさんがdev.toに書いた なぜ dev.to がこんなにも速く、こんなにも自分にとって感動的なのか - dev.to を見た人も多いと思う。個人的にHeroku, Railsを採用してここまで爆速なサイトを構築出来ていることは今までの常識を覆す衝撃な出来事だった。こんな新しい発見をもたらしてくれたdev.toには本当に感謝してる。自分もこんなサイト作ってみたいなと思ってdev.toのことを色々調べてて少し知見がたまったので共有してみます。 この記事はOkinawa.rb Advent Calendar 2017 7日目の記事です。 Twitterやってるのでよかったらフォローしてください🙋♀️ @saboyut
JavaScript Performance Optimization Tips: An Overview — SitePoint
In this post, there’s lots of stuff to cover across a wide and wildly changing landscape. It’s also a topic that covers everyone’s favorite: The JS Framework of the Month™. We’ll try to stick to the “Tools, not rules” mantra and keep the JS buzzwords to a minimum. Since we won’t be able to cover everything related to JS performance in a 2000 word article, make sure you read the references and do y
The Cost Of JavaScript
As we build sites more heavily reliant on JavaScript, we sometimes pay for what we send down in ways that we can’t always easily see. In this post, I’ll cover why a little discipline can help if you’d like your site to load & be interactive quickly on mobile devices. tl;dr: less code = less parse/compile + less transfer + less to decompress NetworkWhen most developers think about the cost of JavaS
Making dev.to insanely fast
It makes me smile when someone raves about how fast this website loads, because that's no accident. We put a lot of effort into making it so. It is the sort of thing that usually goes unnoticed, but when your readers are developers, there's a better chance they notice and appreciate it. I have written about this in the past, but it's worth re-examining because these ideas are always evolving. From
Performance metrics. What’s this all about?
Measuring performance of page loading is a hard task. Hence Google Developers together with the community are working on Progressive Web Metrics (PWM’s). What are PWM’s and why do we need them? A bit history of browser metrics. A while ago we had 2 main points (events) for measuring performance: DOMContentLoaded — fired when page is loaded but scripts just started to be executed. load event which
Saving Bandwidth with Images
In the video, I make a few points about saving bandwidth. I tell you to: serve real videos, not GIFsuse pngcrush to compress PNGskeep an eye on when images are loaded — images hidden with CSS or outside the user’s viewport, will still loadIn this article, I’ll expand on the above — as well as covering SVGs, high-DPI and when you should inline images. In no particular order, let’s start. Visualize
Building Fast & Resilient Web Applications - igvita.com
You've applied all the best practices, set up audits and tests to detect performance regressions, released the new application to the world, and... lo and behold, the telemetry is showing that despite your best efforts, there are still many users—including those on "fast devices" and 4G networks—that are falling off the fast path: janky animations and scrolling, slow loading pages and API calls, a
Making full table scan 10x faster in InnoDB
At MySQL Connect 2013, I talked about how we used MySQL 5.6 at Facebook, and explained some of new features we added to our Facebook MySQL 5.6 source tree. In this post, I'm going to talk about how we made full table scan faster in InnoDB. Faster full table scan in InnoDB In general, almost all queries from applications are using indexes, and reading very few rows (0..1 on primary key lookups and
web.dev
Stay organized with collections Save and categorize content based on your preferences. Explore our growing collection of courses on key web design and development subjects. An industry expert has written each course, helped by members of the Chrome team. Follow the modules sequentially, or dip into the topics you most want to learn about.
High-Performance, Garbage-Collector-Friendly Code - Build New Games
16 milliseconds is not a lot of time. Try eating a hotdog that fast – though I swear I’ve seen our dog go through a beef sausage in under 100 milliseconds. If you want your game to run at 60 frames per second, 16 milliseconds is all you have to get everything done: moving bullets around, creating new entities, drawing sprites, checking collisions, tracking and changing states, handling input and p
wesleyhales.com: Web Performance Testing With PhantomJS
HTTP requests, heavy/unminified resources, and UI thread blocking should be on the mind of every front-end developer. These are just a few issues that can cause serious bottlenecks in page load times. Having a faster load time equals better search engine rankings, higher conversion rates, and an overall reduction in bandwidth costs. I recently took on the task of coming up with an accurate way to
Improved HTTPS Performance with Early SSL Termination - Filepicker.io
Filepicker.io helps developers connect to their users' content. Connect your web or mobile application to Dropbox, Box, Gmail, Facebook, et al. plus dragdrop, image conversion, and upload acceleration. Learn More In the continuous quest for a better user experience, performance plays a large part. Therefore, at Filepicker.io, we go to great lengths to minimize latency. In this post, I’ll go into o
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Loading Performance with (Many) Modules: Summary as of Oct 7, 2017
DeNA Engineering - DeNAエンジニアのポータルサイト