PERFORMANCE MATTERS (joint work with Charlie Curtsinger, Grinnell College) emeryberger.com, @emeryberger Emery Berger College of Information and Computer Sciences UMASS AMHERSTA short time ago : un.bmp Ogle is too slow! OGLE’84 is too slow!Transistors (millions) Clock Speed (MHz) Performance used to be easy 0.001 0.01 0.1 1 10 100 1,000 10,000 1970 1975 1980 1985 1990 1995 gle loading… No mojitos for me… Back to the present…Transistors (millions) Clock Speed (MHz) Performance not easy anymore 0.001 0.01 0.1 1 10 100 1,000 10,000 1970 1975 1980 1985 1990 1995

09.Services Web 19 décembre 2023 Développement web il3 Services web HE-Arc (DGR) 2022 Applications distribuées • Motivation : répartir l’exécution sur plusieurs machines – Principe : Les composants/services abstraction différences – Exemples : RPC, RMI (java), CORBA, DCOM (MS) • Utiliser les technologies du web, comme HTTP et XML : – indépendantes de la plateforme, éprouvées, largement utilisées • Système distribué rvices 1 Service web • 2 visions : – Utiliser les technos web pour développer des applis distribuées – Accès pour une application aux services offerts aux humains • Service web = webapp pour une autre

1 Quickly Testing Qt Desktop Applications with Approval Tests Clare Macrae (She/her) clare@claremacrae.co.uk 16 September 2020 CppCon (Online)2 Audience: Developers testing Desktop GUIs, including and readable with fixtures • ApprovalTests.Cpp.Qt feedback welcome!80 Quickly Test Qt Desktop Applications • All links from this talk, and more, via: – bit.ly/TestingQt – github.com/claremacrae/talks

《Go Web 编程》 《Go Web 编程》 因为自己对Web开发比较感兴趣，所以最近抽空在写一本开源的书籍《Go Web编程》《Build Web Application with Golang》。写这本书不表示我能力很强，而是我愿意分享，和大家一起分享Go写Web应用的一些东西。 对于从PHP/Python/Ruby转过来的同学了解Go怎么写Web应用开发的 对于从C/C++转过来的同学了解Web到底是怎么运行起来的 对于从C/C++转过来的同学了解Web到底是怎么运行起来的 我一直认为知识是用来分享的，让更多的人分享自己拥有的一切知识这个才是人生最大的快乐。 这本书目前我放在Github上，我现在基本每天晚上抽空会写一些，时间有限、能力有限，所以希望更多的朋友参与到 这个开源项目中来。 撰写方法 撰写方法 文件命名 文件命名 每个章节建立一个md文件，如第11章的第3节，则建立11.3.md 11.3.md。 这样读者就可以把相应的Markdown文件编译成html文件，执行go build build.go，执行生成的文件，就会在底目 录下生成相应的html文件 交流 交流 欢迎大家加入QQ群：259316004 《Go Web编程》专用交流群 大家有问题还可以上德问上一起交流学习：http://www.dewen.org/topic/165 致谢 致谢 首先要感谢Golang-China的QQ群1023198

Being Friendly to Your Hardware Performance Engineering A gentle introduction to hardware for software engineers 2Where does C++ run? 3On an abstract C++ machine 4On an abstract C++ machine? In most practical cases at boot time only Same capacity, different composition => different performance profile From JESD 79-4 DDR4 specificationMemory • Memory system is in the uncore • Cores act Multiple instructions resulting in fewer operations • ISA restrictions may have impact to performance Imaginary ARM mov r20, 0x123456789abcdef0Register renaming 52 Branching Fetch Decode Queue

Writing Web Apps in Go Andrew Gerrand Rob Pike May 10, 2011 Feedback http://goo.gl/U5rYj #io2011 #DevTools What is Go? A programming language for today's world • Go is fun, efficient, and open source fun to work in. – efficient - performance approaching C for CPU-intensive tasks, – designed for modern hardware (multicore, networks), – aimed at software such as web servers, – ... but turned out 5 Overview • News from a year of development. • A web server written in Go. • Deploying Go in production. • Prerequisite: some knowledge of web servers, not much Go. • Some big announcements and fun

struct Object-oriented interface Concurrency Summary Web foundation Web working principles Build a simple web server How Go works with web Get into http package Summary HTTP Form Process form Prevent hijack of session Summary Text files XML JSON Regexp Templates Files Strings Summary Web services Sockets WebSocket REST RPC Summary Security and encryption CSRF attacks Filter inputs 15.7 1.16 1.17 Build a web framework Project program Customized routers Design controllers Logs and configurations Add, delete and update blogs Summary Develop web framework Static files Session

Poster submission: Modern C++ for Parallelism in High Performance Computing Victor Eijkhout CppCon 2024 Introduction This poster reports on ‘D2D’, a benchmark that explores elegance of expression and context of a High Performance Computing ‘mini-application’. The same code has been implemented using a number of different approaches to parallelism. Implementations are discussed with performance results. Relevance multi-dimensional arrays through ‘mdspan’, it is interesting to explore what C++ can offer for lower level performance critical operations. Scientific computing is an interesting test cases since many algorithms are

08.RSS 19 décembre 2023 Développement web il3 Really Simple Syndication HE-Arc (DGR) 2022 Syndication • Principe de vendre un contenu à plusieurs médias • Dans les journaux : dépêches, bandes dessinées dessinées, … • Télévision : jeux, séries • Web : Flux RSS / Atom – 1 source de donnée, plusieurs abonnés – Contenu : news, blogs, podcast, … – Accès unique à plusieurs sources d’informations – Mises à jour neuf versions de RSS généralement incompatibles entre elles. Lire The myth of RSS compatibility1 Applications • Récupérer l’info pour : – la lire – la réutiliser sur un site • News • Notification : activité

Why We Use Go Web Frameworks Web Service 框架解决的核⼼心问题 —— 严清 teambition 团队协作⼯工具创导者 关于我 • 五年年 JS ，⼀一年年 Go，也玩 Rust Github 满满绿格⼦子⻅见证我开发⽣生涯的⼀一⾯面 • 16 年年底组建 Go 团队，重构后端服务体 系，为此造了了⼀一些轮⼦子，如 Gear 框架 技术学习⽆无⽌止境，逼迫个⼈人成⻓长，推进团队成⻓长 Why I Don’t Use Go Web Frameworks ——Joe Chasinga 本想⽹网上搜个 PPT 交作业给谢⼤大~ 结果： • http package 能⼒力力强⼤大，已是⼀一个 web 框架 HTTP能⼒力力确实相对完整 • 即使有更更复杂的需求，即插即⽤用的包管理理 机制也能轻易易实现 否则，还是使⽤用⼀一款框架吧！ Web 框架要解决三个核⼼心问题 • 定义灵活、⼀一致的开发模式 简单易易上⼿手，⽀支撑⼤大规模复杂应⽤用，⽀支撑团队开发 • 集成简洁、完善的异常处理理能⼒力力 不不被 if err != nil { } 羁绊，不不放过任何异常，优雅漂亮地处理理错误和异常 • 提供强⼤大、实⽤用的 HTTP 操作⽅方法语法糖 写 web 服务就是操作 HTTP，实